mv & lv protection coordination

Aucun titre de diapositive

NEWNEWMV & LV PROTECTION COORDINATION

Duration: 52 mn

IOptimize the performance and costs of your installationUse design assistance tools?Expert: J.Schonek / C.Collombet Pedagogy: F.Bcheret / C.CaylaProduction: AMEGOverview of Merlin Gerin products: Guiding Systemfor electrical installation designers

Cost reduction: officesCost reduction: workshopLV ring distribution system:factorySummaries of discrimination, cascading and types of motor coordination

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BLogic discrimination in MV:airportsLV motor protection coordination: industrial buildingSource redundancy and discrimination:hospitalDesign assistance toolsNEWCoordination DiscriminationCascadingMV LV protection coordination October 2005 1

MV LV protection coordination October 2005#

Hello and welcome to the "Coordination of medium voltage and low voltage protection" training module. Our aim is to show you, # electrical installation designers: how the coordination of protection allows you to #optimize the performance and costs of your installation,and what # design assistance tools are provided to you by Schneider Electric.We will present the topic using examples of real installations. Rather than going over all possible cases, you can choose the examples that are of the most interest to you. The module includes:- The topic of # cost optimization applied to offices,- and to a # workshop,- the impact of # source redundancy on discrimination, with the example of ahospital,- a # LV ring distribution system application for the power supply of afactory, - an example of # logic discrimination in medium voltage, in an airport, and also a case of # low voltage motor protection coordination in an industrial building.This is followed by: - a # presentation of the main design assistance tools, # summaries of discrimination, cascading and types of coordination of motor protection devices. # and a quick overview of the Merlin Gerin offer.You may, at any time: go on to the next slide by clicking # on the "forward" arrow,or move to the slide of your choice by clicking on a title in the list on the right.You may begin. # ? coordination, discrimination, cascadingSafety of people and equipment Discrimination: Continuity of serviceOptimization of installation costsMotor coordination:Cascading:Protection coordination:combining devicesonly the circuit breaker directly upstream of the fault tripsreinforces the breaking capacity of the downstream breakerprotection, control and isolationLV onlyTo find out more: slides 3 to 5otherwise, slide 6MV LV protection coordination October 2005#

In an electrical installation, the # coordination of protection consists of designing and # combining the different devices so as to ensure optimum overall operation.Coordination encompasses several different aspects: # discrimination: which consists of ensuring that, in the event of a fault, # only the circuit breaker located closest to the fault will trip,# cascading: whereby action by the upstream circuit breaker # reinforces the breaking capacity of the downstream breaker. Please note that this only applies to low voltage.And, for # motors in particular, the choice of compatible devices that provide the best # protection, control and isolation.

The coordination of protection answers 3 requirements: the # safety of people and equipment, # continuity of service, and the # optimization of installation costs.

- discrimination: definitionDiscriminationNo discriminationThe other feeders are still poweredThe other feeders are not poweredCB1

CB1 and CB2 tripCB2CB1Only CB2 tripsCB2


Theres # discrimination between # 2 series-mounted circuit breakers # CB1 and # CB2, when, in the event of # a fault downstream, only # CB2 trips #. The other feeders # are still powered.There is # no discrimination when, in the # same situation, both circuit breakers # CB1 and # CB2 trip.The # other feeders are not powered.

CB2

- cascading: choosing a circuit breaker with less breaking capacityWithout cascadingWith cascading

Icu

Icu < IscDownstream breaker with lower ratingCB1< IscMV LV protection coordination October 2005#

In # principle, # without giving any thought to cascading, if a circuit breaker CB2, with a breaking capacity # less than the # prospective short-circuit current is used, the breaker . # is liable to be destroyed.However, with # cascading,such a breaker can be used. By selecting a # pair of circuit breakers such that the # upstream breaker contributes to breaking by the downstream device, the # rating of the downstream breaker can be lower, reducing the cost of the installation.

- 2 cases of cascadingCB1 and CB2 tripCB1: current-limiting effect

Cascading to the detriment of discriminationCascading reinforces discrimination The other feeders are still poweredCB1CB2The other feeders are not powered

CB1CB2Contributes to breaking without tripping

More details chapter HMV LV protection coordination October 2005#

Two cases of cascading are possible: - either # CB1 trips at the same time as CB2 #.(PAUSE) but this results in the same # situation as weve already seen, with no discrimination; - # or else CB1, by having a current-limiting effect, contributes to breaking, without completely opening. Only # CB2 trips, so # the other feeders are still powered.

Instead of being # to the detriment of discrimination, in this case, cascading # reinforces discrimination.

A/ COST REDUCTION: offices on industrial site

Source redundancy and discrimination: hospital Cost reduction: officesCost reduction: workshopLV ring distribution system: factorySummaries of discrimination, cascading and motor coordination

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BLogic discrimination in MV: airportLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascadingProduct overview: Guiding SystemCost reduction: officesMV LV protection coordination October 2005#

The first two examples show how # the cost of installations can be reduced. Let's look at the case of offices on an industrial site.

- offices on an industrial site: cascading 30mof cableMLVS10 office feeders 250A Isc 27kA 30A 2 x 1600kVA = 3.2 MVASpecify the devices required:1) Standard specification of circuit breakers and ratings2) Implementation of cascading3) Checking of discriminationSoftware approachSystem earthing arrangement: TNS400VManual approach:

2880A source

panelboardIsc 81kAPrimary substation:MV LV protection coordination October 2005#

For these # offices, the installation cost is reduced by cascading.Here's the # simplified electrical distribution diagram.

The power supply is provided by a # private primary substation, with # two 1600 kVA transformers . at # 400V. The # System Earthing Arrangement is TNS.The LV network is made up of a # main Low Voltage switchboard (MLVS) which supplies, via # 30m of cable, a # panelboard with #10 feeders for the offices.Here are the short-circuit currents and rated operating currents calculated: at # the main LV switchboard and # below.

To # specify the circuit breakers # for all the feeders, two approaches may be used: # manual and # software. The manual approach includes 3 steps: # 1- standard definition of the types of breakers & ratings,# 2- implementation of cascading,# 3- checking of discrimination.We'll explain them.

Compact NS100 to 630Breaking capacityIcu at 415V

250A source- standard choice of the main LV switchboard circuit breaker

Isc 81kAIsc 81kA 250A

COMPACT NS250LMLVS 250A Isc 81kAMERLIN GERINcatalogueMV LV protection coordination October 2005#

The standard choice of the type of circuit breaker is made using the # selection tables in the Merlin Gerin LV catalogue.

For the # main LV switchboard cable feeder, a breaking capacity of at least # 81 kA is needed so we have to choose from the # 150kA row. For the # 250A load, we choose the # appropriate column.

# So the breaker to use is .a # Compact NS 250 L.

10..32..80numberratingtypecurvemagneticbreaking capacity at 415Vof polesthreshold(kA)In16253650

- standard choice of feeder circuit breakers 10 office feeders 30A Isc27kAMERLIN GERINcatalogue 30A Isc27kA 30A Isc27kA

30A Isc 27kA

NG 125 HPanelboardMV LV protection coordination October 2005#

To choose the circuit breakers for # each office feeder, we refer to another # table in the catalogue.

For the # 27 kA calculated: the breaking capacity to choose is # 36kA. For the required # 30A, the # 32A rating is chosen from the 10 to 80 Amp series.

# So the breaker to use is.. the # NG125H.

- implementation of cascading Breaking capacity 36 kA if used alone

upstreamRequired Isc = 27kA

C60NLV complementary technical information The NG 125 H is replaced by a smaller device: the C60 N

30downstreamMV LV protection coordination October 2005#

Step 2 consists of implementing cascading.

There are # tables that summarize the "help" that the upstream breaker can give to the downstream breaker.

Here we have the # NG 125 H, chosen as the downstream breaker for its # 36 kA breaking capacity when used alone. If it operates with an # NS250L upstream, its breaking capacity goes up to #100 kA. That's more than the # 27kiloamps we need. So we can move up the column and select a smaller, less expensive breaker.

A breaking capacity of # 30kA is fine. It's provided by the # C60 N. #LV complementary technical information

Isc 27kAC60N-checking of discrimination MLVS10 office feedersNS250L

discrimination guaranteed

downstreamupstreamIsC60N breaking capacity reinforcedNS250LIsc 27kAMV LV protection coordination October 2005#

Step 3 consists of checking that discrimination is still guaranteed. In the event of a # short-circuit on an office feeder, only the circuit breaker # directly above the fault should trip, not the one upstream.

The # cascading and enhanced discrimination table tells us that for the configuration with the 2 # upstream and # downstream circuit breakers chosen previously, # discrimination is guaranteed. The table gives some further information:- the # figure on the right indicates that, by cascading, the # breaking capacity of the C60N is raised to 30kA. Remember that it's only 10kA when used alone,- the # figure on the left shows that the discrimination threshold is 30kA, which is compatible with the # short-circuit current in our installation.

Therefore discrimination is # still guaranteed. MLVS panelboard- let's recap 1) Standard specification of types of breakers and ratings2) Cascading approach3) Checking of discriminationManual appraoch:

StandardNG125H

36kA32AThen replaced by C60N

10kA 30kA32ACompact NS250L

150kA250Amains

ISC 81kA 250AISC 27kA 30Adiscrimination guaranteedMV LV protection coordination October 2005#

To recap the approach #: according to the # network characteristics on their own, we chose a # Compact NS250L for the main LV switchboard, and an # NG 125H for the panelboard. After analyzing cascading though, we found that a # C60N was sufficient downstream. We checked that with that combination, # discrimination is still guaranteed.And that's it for the # manual approach.

- and with Ecodial

Global software approach 27.10 kADesign installations Diagram plottingCurrent and voltage calculationCable cross-section calculationChoice of productsDiscrimination and cascadingProtection of peoplePrinting of results

32 A 250 A 81 kAMV LV protection coordination October 2005#

Another alternative is the software approach, with the # Ecodial software tool: it can be used to # design LV installations according to the IEC standards, and it provides the following functions:- # plotting of the single-line diagram- # calculation of short-circuit currents, fault currents and line voltage drops- # optimized determination of cable cross-sections- # complete choice of Merlin Gerin switchgear- # discrimination and cascading- # verification of the protection of people- # printing of results

The user enters the # network characteristics: voltage, # cable length and # load current, and Ecodial comes up directly with the # choice of circuit breakers that fit the requirements. It confirms:- the # NS250L 250A upstream- and the # C60N 32A downstreamB/ COST REDUCTION: manufacturing workshop


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BLogic discrimination in MV: airportLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascadingProduct overview:Guiding SystemCost reduction: workshopMV LV protection coordination October 2005#

The second example of # cost reduction is a manufacturing workshop. Double savings are obtained by derating of both the busbar trunking and the switch-disconnector.

- high load density & need for flexibility Distribution by busbar trunking 2) Verification of savings made by cascading16 workshop stations 400V

Isc 35kA160A Isc 30kA10A Compact NS160NBusbar trunking1) Specify the busbar trunking model using the catalogue approachpanelboardMV LV protection coordination October 2005#

There is a high load density in this # workshop and a strong need for flexibility, since the power demand and machine locations often change.

The # electrical diagram is similar to the one in the previous case with a # 400V network.

To meet the need for flexibility, the # 16 work stations are supplied by # busbar trunking.The calculated short-circuit currents are # 35 and # 30 kiloAmps, and the rated operational currents are # 160 and # 10 Amps.

The busbar trunking is protected at the main LV switchboard feeder by a # Compact NS160N.We're going to: - first # choose the required busbar trunking using the catalogue, and #check the savings made by cascading, and then do the same thing for the # incomer switch and the 3 panelboards required for the overall operation of the building.

Canalis KScatalogue160NS160KSA-1636

sourceMLVS16 work station feeders- choice of the busbar trunking

Isc 30kACompact NS160NBusbar trunking

KSA-16= 160A MV LV protection coordination October 2005#

We refer to the # catalogue. If we use a # Compact NS160N, we need # 36kA and#160A busbar trunking to cover the # short-circuit and # load requirements.That means # KSA16 busbar trunking.

sourceMLVS16 work stations feeders

Canalis KScatalogue

- highlighting cascadingThe Compact NS160N limits the short-circuit current on the busbar trunking 22KSA-80x 2.5 = 75 kA peak

Isc 30kACompact NS160NBusbar trunkingIsc 30kAPermissible rated peak currentKSA-1678.7Without Compact NSwould have to be usedMV LV protection coordination October 2005#

Let's look at the performance gained by the busbar trunking when combined with the Compact circuit breaker.The # table indicates that, # on its own, the # KSA16 busbar trunking could permit a # maximum peak current of # 22kA. This would be far from sufficient for a prospective short-circuit current of # 30kA RMS, the # peak value of which could reach 75 kA. So # KSA80 trunking would have to be used.The # Compact NS160N limits the short-circuit current on the busbar trunking, making it possible to reduce the rating and thereby optimize costs.

We could have obtained the same information using Ecodial, as weve already seen..

- choice of the switch-disconnector: catalogue

160A sourceMLVSIsc 25kApanelboard

Merlin GerincatalgoueInterpact INS 250MV LV protection coordination October 2005#

A similar gain is made in the # panelboard, on the main incomer switch-disconnector.The network constraints are:a # short-circuit current of 25 kA,a load current of # 160 A.When we refer to the # catalogue, we see that its the # Interpact INS 250 that meets the # conventional thermal current and # short-circuit making capacity requirements.

Compact NS160N- highlighting of cascading

160A Isc 25kA

sourceMLVSpanelboardsInitial choice: INS 250-160LV complementary technical information

upstream circuit breakerdownstream switch-disconnector: initial choice

Interpact INS 160:final choiceFinal choice: INS 160-250MV LV protection coordination October 2005#

But we havent yet taken into account the help that the # upstream circuit breaker gives to the # switch-disconnector.The # switch coordination table shows that when the # INS 250-160 is combined with an # NS 160 H circuit breaker, its making capacity is reinforced: alone it was 30 kA, but with the NS 160 H, its up to # 154 kA. Thats much more than required, so a # smaller switch can be chosen: the # INS 160.

It so happens that its making capacity is # 154 kA as well, but we stop there since there are no smaller switches for 160 Amps.

INS 250INS 160- a system approach to reduce costs LV complementary technical informationEcodialProduct cataloguesNG125

e.g. workshop

e.g. office

C60

NSKSA-80KSA-16

NS

NS


To conclude, the tools provided by Schneider Electric, such as # Ecodial software, # LV complementary technical information and # product catalogues can be used to make the best choice, simply and efficiently.Weve shown in the # office applications that there are 2 ways to # choose devices: either by considering each case individually # in separate levels, which can result in the specification of oversized # devices,or by taking into account # all the requirements, making it possible to choose # more cost-effective devices.

The same applies to the # workshop example: instead of the # separate level approach, the # global approach makes it possible to # reduce the size of the products: busbar trunking and switch-disconnector.

These examples can be transposed to all sorts of applications.C/ SOURCE REDUNDANCY AND DISCRIMINATION: a hospital


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BLogic discrimination in MV: airportLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascadingProduct overview:Guiding SystemSource redundancy and discrimination: hospital MV LV protection coordination October 2005#

With cases of # source redundancy, we need to maintain the same guaranteed discrimination, even when there's a changeover to the backup system. This was the challenge in the following example of a hospital.1260 kVA- hospital: source redundancy calls for special attention to discrimination

mainsorgenerators80 beds / 6 floors11000mUnderground parkingOperating room and instrument sterilization Hospital center for women and childrenMV LV protection coordination October 2005#

This #center for women and children, under construction, is a leading-edge medical structure, not only technically but also in terms of comfort. It has a technical zone, consisting of an # operating room with an instrument sterilization station. The total surface area is # 11,000 m, with # 80 beds, 6 floors, and # underground parking.

There are two power supply systems with the same installed power: # 1260 kVA. The power is # supplied either # by the mains, # or by # backup generators.

- total source redundancyDiscrimination study:Isc 6kA1800A 100 m of cableIsc 23kA1800A 900A 900A Source transferABSFPriority main MLVS feedersNon-priority main MLVS feederscircuit breakers A and Scircuit breakers B and Scircuit breakers S and F400A

2 x 630kVA2 x QM 630A2 x 630kVAtransformers400kVAUPS

Refrigerating settotal discrimination requiredMV LV protection coordination October 2005#

Here's the electrical diagram. There is total power supply redundancy with, on one side, # the mains, and on the other, # the two 630kVA generators.

A # source transfer automatically transfers the mains supply to the generators when needed.The # non-priority loads are grouped together to allow partial operation by the tripping of # circuit breaker S.Here are the # short-circuit current and # rated operating current values.

The protection devices are chosen according to # discrimination between the levels:1- circuit breaker # A in line with breaker S,2- circuit breaker # B with breaker S,3- and circuit breaker # S with breaker F.# Total discrimination is required.

- choice of circuit breakers A and SIsc 6kAGenerators 1800A S 900A TransformersANW20 H1In = 2000A65kANS1000NIn = 1000 A50 kATotal discrimination

LV complementary technical informationMV LV protection coordination October 2005#

To choose A and S, we know that the circuit breaker installed at point A needs to let through an # 1800A current, and provide a breaking capacity of at least # 6kA. Our choice will be the # Masterpact NW 20H1. It will be equipped with the interlocking that goes with the source transfer function.The circuit breaker installed at point S must be able to supply a # 900 A load: it can be a # Compact NS1000N.

Based on this choice of upstream and downstream breakers, we're going to double-check in the # table that discrimination is guaranteed:

We read that: the # NW20 H1 equipped with its Micrologic 5 control unit, combined with the # NS 1000 N provides a # total discrimination. Be careful: this result refers to a # non-activated instantaneous threshold.

Generators- circuit breakers A and S: graphical verificationIsc 6kASource transfer 1800A S 900A ANW20 H1In = 2000A 65kANS1000NIn = 1000 A50 kATransformersMicrologic5.0Ir = 0.9x2000AIm = 2.5 x IrMicrologic2.0Ir = 0.9x1000AIm = 2.5 Ir

T (s)I (A) Ir Ir Im ImTotal discriminationS AMV LV protection coordination October 2005#

We can do a graphical verification using # Ecodial software: based on the network diagram, and the short-circuit current and rated operating current values, the software plots the tripping curves of the two circuit breakers in the # time / # current plane, taking into account the Micrologic control unit settings: - for A #: long time setting # Ir = 1800 Amps, and # short time setting Im= 2.5 x Ir , i.e. 4 500 Amps,- for S #: Ir # = 900 Amps and # Im = 2250 Amps.Ecodial indicates that # discrimination is total.

- circuit breakers B and S: graphical verification

NW20 H1In = 2000A65kAATSSB 1000A Isc 23kANS1000NIn = 1000 A50 kABSMicrologic 5.0Ir = 0.9x2000AIm = 10 x Ir Micrologic 2.0Ir = 0.9x1000AIm = 2.5 Ir

1800AIm=18000Ir=1800Total discriminationMV LV protection coordination October 2005#

Lets examine the choice of circuit breakers B and S. B will be the same as the one on the generator side, an # NW20H1.S is already defined: its the # NS1000N.Ecodial gives us these # time / current curves.

The tripping threshold settings are still the same for # S with Micrologic 2.0: this is the same curve as the previous one.For # B which we've equipped with a # Micrologic 5.0, the settings are slightly higher, with a # long time setting Ir of 1800 A, # and a short time setting Im of 18,000 A.

This confirms that there is # total discrimination!- choice of circuit breaker F

SFNS 400 NIn = 400 A45 kAUC STR 23SEIr = 400 AIm = 3 x Ir = 1200 AInstantaneous setting = 4400 A 400A

SF

NS1000NIn = 1000 A50 kAMicrologic 2.0Ir = 0,9x1000Aseuil bas 2,5 IrRefrige-rationunitNon-priority main MLVS feedersMicrologic 2.0Ir = 0.9x1000AIm = 2.5 x Ir Total discriminationMV LV protection coordination October 2005#

We've now come to the last discrimination study, between circuit breaker # S and # circuit breaker F, which protects the refrigeration unit.We still have the same characteristics of S and its Micrologic 2 control unit. Please note that its curve is the # red one this time.

At point # F, given the load current, a # Compact NS 400N is required.Ecodial # confirms total discrimination with that breaker, if an# STR 23 SE control unit is used. The settings may be read on the blue curve.

It is necessary however to go further in the study and examine the specific characteristics of the refrigeration unit, in particular the motor starting currents.- backup / mains supply redundancy: be careful of discriminationSelection assistance tools (for references, see chapter G)

Discrimination studies

Control units with wide ranges of settingsLV complementary technical information

MERLIN GERINcatalogue Ecodial 3


To conclude, we should remember that with backup genset / mains supply redundancy, particular attention must be paid to discrimination.

# Selection assistance tools are available to help with installation design: # product catalogues, # complementary technical information,-# Ecodial version 3 software,- as well as # discrimination studies that can be conducted by Schneider Electric.

With these tools, you can use all the functional features of the # control units together with their wide ranges of settings. D/ LV ring distribution system: factory


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BLogic discrimination in MV: airportLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascadingProduct overview:Guiding SystemLV ring distribution system: factoryMV LV protection coordination October 2005#

Protection coordination is useful in # LV ring distribution systems, such as in this factory.- 20000 m industrial building8MVA power

2000KVA2000KVA2000KVAMLVSMLVSMLVSMLVS2000KVARefrigerat-ing setOfficesPaintingPackagingForming

Cutting

Sheetmetalwork107.5m5 %25 %30 %30 %discriminationnormal operation (4 or 3 transformers)transient operationStudy of LV ring system protection plan circuit breakerskeep down time to a minimumensure safetyhigh power densityProblem Ring distribution system400Vpartial operation possible (without Heating Ventilation Air Conditioning )Electrical installationguide


This # industrial building was put into service very recently. It has an # installed power of 8MVA, distributed mainly as follows:# 5% for the offices, # 25% for sheetmetalwork, cutting and forming, # 30% for the paint shop, and # 30% for the HVAC (heating, ventilation and air conditioning) common to the workshops + offices, with installations all over the factory. The # mains supply is at 400V.# A ring distribution system was chosen, supplied by 4 transformers, 2 MVA each. This is appropriate for a building with # a consistent high power density (see the Electrical Installation Guide), and it allows # partial operation, by load shedding of the HVAC. We'll examine the # problem which consists of # ensuring the safety of people and equipment, with a strong need to # keep downtime to a minimum.The # LV ring system protection plan will be examined for both modes:# "normal" operation, which encompasses closed ring operation with 4 transformers, and also partial ring operation on 3 transformers (the HVAC having been disconnected),and # transient operation, that is, during a starting phase or reconfiguration after an incident.

We will examine #, each time, the # choice of circuit breakers and we'll double-check # discrimination.

- choice of circuit breakers

NW H2 3200A

General protectionFeeder protectionIsc 31kA 1800A MERLIN GERINcatalogueNW H1 2000AMLVSMLVSMLVSMLVSMV/LV transformerDrawout circuit breakers

Masterpact NWIsc 81kA 2880A Isc 81kA 2880A Isc 31kA 1800A Isc 81kA 2880A MV LV protection coordination October 2005#

For the choice of circuit breakers, the points in the LV ring to be considered are: the # feeder protection devices, and the # general protection devices of each switchboard.Here are # the maximum # short-circuit current and rated # operating current values. They have been calculated to cover both operating modes: normal operation and transient operation.

Due to operating habits, # drawout circuit breakers must be used. The # catalogue choice will focus on 2 types of # Masterpact NW circuit breakers: for general protection: the # short-circuit current and # rated operating current constraints call for a # 3200A H2,for ring feeder protection, the # short-circuit current and # rated operating current constraints call for a # 2000A H1.

- discrimination in normal operation

> 2 x 3200A9kA

MLVSNW H2 3200Adiscrimination for each type of fault:0.3 s.0.20.10.30.20.10.30.20.10.30.20.10.3or 0.2or 0.1idelaytSettingstime discriminationIsc ph/n = 12kAId ph/pe = 10kAin the LV ring systemupstream of the MV/LV transformerin the main LV switchboardMV LV protection coordination October 2005#

Let's look at the study of discrimination in normaloperation mode. It's designed to specify the # protection settings.

First we define the short-time trip setting: we know that it has to be less than the minimum short-circuit current. At the main LV switchboard level, with the power supply reduced to 3 transformers, it's been calculated as:# 12kA for a phase to neutral fault and # 10kA for a phase to PE fault.

The thresholds for the general incomer circuit breakers and the feeders are set, according to the rule, to 10kA -10%, i.e. # 9kA. We have to check that, according to the usual rule, this remains higher than # twice the circuit breaker's rated current.

Then we set the tripping delays to have # time discrimination between the various circuit breakers. The different time delay values # are given in the diagram in seconds.

The slides which follow show how # discrimination is ensured. 3 cases are examined:- if the fault occurs # in the LV ring system,- or # upstream of the MV/LV transformer,- or # in the main LV switchboard.- fault in the LV ring system

Fault: the entire ring is stressed The 4 x 0.1 s protection devices tripOne 0.2 s protection device tripsOnly the faulty portion of the ring remains de-energized

no currentnormal currentcourant short-circuit

no currentnormal currentshort-circuitMV LV protection coordination October 2005#

When a # short-circuit occurs on the ring at a point in time t, # the entire ring is stressed.

The 4 protection devices set to # 0.1 second # trip first. The sections not concerned by the fault continue to be supplied by the MV/LV transformers.

At t+0.2 seconds, just # one of the protection devices set to 0.2 still detects the fault. It # trips to isolate the faulty portion.The other portions of the ring operate and have only detected the fault for 0.1 s at the most.

Here's a # summary of the complete scenario.

- fault in MV section

Fault: the entire ring is stressedThe 0.1 s protection devices tripOnly one main LV switchboard and a portion of the ring remain de-energizedAction is taken upstream to clear the faultPower is restored0.20.30.30.30.10.20.10.10.10.10.10.10.10.20.30.2no currentnormal currentshort-circuitMV LV protection coordination October 2005#

When a short-circuit occurs # upstream of the MV/LV transformer, first, the entire # ring is stressed. This scenario is similar to the previous one.

The 4 protection devices set to # 0.1 second trip.Only one # main LV switchboard and a portion of the ring go down. The rest of the system stays up.

After action is taken upstream # to clear the fault, power can be restored to the # portion of the system that was down via the # circuit breakers in the isolated part.

# The entire ring is powered again.

# Here's a summary of the complete scenario.

- fault in the main LV switchboard

Fault: the entire ring is stressedThe 0.1 s protection devices tripThe main LV switchboard general protection device trips in 0.3 sOnly one switchboard + a portion of the ring are de-energizedThe circuit breaker near the faulty switchboard is openedPower is restored to part not affected

no currentnormal currentshort-circuitMV LV protection coordination October 2005#

When a # short-circuit occurs in a switchboard, the entire # ring is stressed.

The # protection devices set to 0.1 second trip first, # isolating the switchboard affected by the fault and the related portion of the ring #.

The # general protection device of the main LV switchboard concerned then trips, fully # eliminating the fault.

Next, the # circuit breaker right after the faulty switchboard is opened to # isolate the minimum faulty circuitry, and the # appropriate circuit breaker is closed to restore power to the greatest possible part of the ring.

Here's # the complete scenario.

And that's it for the normal-mode discrimination study.- discrimination in transient operation

Current0.3 s0.3 s0.3 s0.3 s0.3 s1200AIsc ph/n = 10kAId ph/pe = 7.8kA10kA - 10% = 9kANW H2 3200A too close to 3200A x 27.8 - 10% = 7.02kAidelayGround fault protection settingsMicrologic 6.0 A, P or H with ground fault protectionMicrologic 6.0 A, P or H

XMV LV protection coordination October 2005#

In transient operation, during startup or reconfiguration, the # minimum fault currents calculated are slightly lower than in normal operation, namely:

# 10kA instead of 12 in normal mode for a phase to neutral fault, # 7.8kA instead of 10 for a phase to PE fault.

Setting the protection devices of the main incomer and the feeders of each main LV switchboard to # 9kA, as previously, ensures satisfactory protection against short-circuits.

A setting of # 7.8kA -10%, or 7kA, would be too close to twice the incomer circuit breaker rated current, and there would be a risk of unwanted tripping. So we'll # eliminate that solution.To ensure protection against insulation faults (and therefore the protection of people), it's preferable to use a # Micrologic 6.0 control unit with # its ground fault protection. It should be set to # 1200A. This solution is used on the # general incomer circuit breakers only.The tripping delay is maintained # at 0.3 s.- innovative architecture: maximum continuityIngenious installation design

High-performing Micrologic control unitsDiscrimination guaranteedElectrical Installation GuideMD1 ELG 2E

Selection assistance toolsMV LV protection coordination October 2005#

To conclude, we've analyzed an innovative LV ring distribution system architecture in which maximum continuity of service is guaranteed.The # excellent discrimination obtained is the result of an #ingenious installation design combined with the use of # high-performing products: Micrologic control units.The # reference document here is the # Electrical installation guide, a practical, down-to-earth manual that you're sure to appreciate.E/ LOGIC DISCRIMINATION IN MV:airport


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BLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascadingProduct overview Merlin Gerin: Guiding SystemLogic discrimination in MV: airportLogic discrimination in MV: airportMV LV protection coordination October 2005#

In this new example, you'll see a situation that requires the use of # logic discrimination in medium voltage.

hangarAD

- airport extension: need for uninterrupted MV and LV power supplymax. Isc 17,6 kAmin. Isc 9 kADistribution networkSatellite 118kV distribution/coupling switchboard Satellite 2Hotel2nd sourceDiscrimination study: A... D Protection of busbarsMV/LV

Satellite 31000 kVAMV LV protection coordination October 2005#

We are in an # international airport. The commercial transit business depends directly on the continuity of the power supply. It's essential for the protection devices to be selective.An # 18kV distribution / coupling switchboard supplies a # large hangar, 3 # satellites and a # hotel. The switchboard is normally supplied via 2 sources: the # city's electrical distribution network, and a # second source. The calculated short-circuit power on the busbars is # 17.6kA at the most and # 9kA at the least. The # MV/LV substation for the large hangar is # 1000 kVA. The buildings are supplied by open ring systems.

2 aspects of the project are presented:the # implementation of discrimination at all levels, between the protection device imposed by the Utility at point # A and the # hangar's transformer protection circuit breaker D;the implementation of the # protection of the 2 coupled busbars of the distribution switchboard #, to guarantee the best continuity of service in the event of a fault.

440 mslogicdiscriminationA500ms1000A

Protection Ir = 1000A / 500 msVIP 30 relaysLow setting 400A / 60 msti

Distribution networkBCDA60ms400ADBCSFT 2841 software- logic discrimination between circuit breakers A-B-C-D

Sepam catalogueSEPAMseries 20 relaysovercurrentANSI code 50 51 logic discrimination Sepam series 20see also chapter H slide 54MV LV protection coordination October 2005#

The problem is simple: upstream, at point A, the Utility imposes the use of # a protection device set to 1000A, with a 500ms time delay#. Downstream, at the level of D, a 1000KVA transformer protection device must cover # inrush currents - shaded on the graph. The # VIP30 relay provides this protection. As shown in the # graph, the tripping threshold should be set to 400A, with a time delay of 60ms.For the setting of the intermediary circuit breakers, the # tripping time interval between A and D is very short, so time discrimination is not appropriate. The solution here is to use # logic discrimination.This technique uses data exchange via a link between the protection relays to trip the circuit breaker closest to the fault, and inhibit the others. The # Sepam series 20 relay equipped with overcurrent protection functions, ANSI code 50 and 51, includes the logic discrimination function. It will be used to equip circuit breakers B and C.The #SFT 2841 software tool is used to set up the required blocking signals.

Logic discriminationDirectional protection- busbar protection: combining directional protection and logic discrimination

Sepam catalogueEasergy T200 IAutomatic reconfiguration mechanismno currentnormal currentshort-circuitBB22nd sourceDistribution network

B1


To protect # the busbars, in the case of a short-circuit, one of the 2 power supplies must be maintained, regardless of the location of the fault. To do so, at # B1, a # directional protection function 67, associated with the logicdiscrimination option is used. According to the direction of the short-circuit current that trips the directional protection device, the device sends a blocking signal to one of the upstream breakers to stop it from opening.For example: in the case of a # short-circuit on the left part of the busbars, the entire # ring is stressed. Circuit breaker # B1 trips and its relay sends a # blocking signal to B2. # B trips as well, # isolating the # fault. The busbar power supply continues via the second source.For a short-circuit on the right part of the busbars, the system works the same, but the other way around.

There's no break in the supply to the downstream rings: the opening point of the loop is simply moved. An # Easergy T200 I automatic reconfiguration mechanism performs this function.

The # Sepam series 40 device includes both functions: # logic discrimination and # directional protection.- main points to remember Logic discrimination:MV Protection GuideCG0021ENSepam series 40 data sheet PCRED301002ENSepam series 20 Data sheet PCRED300065ENSFT 2841 softwareall situations in which time discrimination is impossibleMV & LV ring systems

Selection assistance tools:MV LV protection coordination October 2005#

You should remember that:- # logic discrimination is a high-performing functional feature that ensures discrimination in # MV and LV ring configurations, and in all # situations in which time discrimination is impossible.- the # reference tools on this topic are:the # MV Protection Guide,the # device installation and setting manuals,and the # Sepam parameter setting software tool.

That's it for the example of the airport.

LV motor protection coordination: industrial buildingF/ LV MOTOR PROTECTION COORDINATION: industrial building

Source redundancy and discrimination: hospital Cost reduction: officesCost reduction: workshopLV ring distribution system: factorySummaries of discrimination, cascading and motor coordination coordination moteur

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BLogic discrimination in MV: airportDesign assistance tools?Coordination DiscriminationCascadingProduct overview: Guiding SystemLV motor protection coordination: industrial buildingMV LV protection coordination October 2005#

The last case pertains to # LV motors, where coordination between the control and protection functions is essential.

- utility motor control

Isc 42kAChoice of motor protection and control devices15 kW motors1500 rpmDirect on-line starting55 kW motors1500 rpm Star-delta starting 15 kW motors: 3 options55 kW motors: 1 optionContinuity of service is vitalMV LV protection coordination October 2005#

In this # industrial building, the # supply and control switchboard includes feeders for two types of motors: # 15 kilowatt motors with direct on-line starting: these are essentially fans, # 55 kilowatt motors with star-delta starting: these are mainly pumping stations.

The calculated short-circuit current for the switchboard is # 42 kiloAmps.The utility motors are vital for the operation of the building, so # uninterrupted service is of the utmost importance.

We're going to have a look now at the # choice of protection and control devices, grouped together in the switchboards. For the # 15 kilowatt motors, 3 ranges of switchgear are proposed, according to the operating conditions. # For the 55 kW motors, 1 option is presented.

- 15kW in normal conditions: ISC < 50kAIEC 60947-4-1 standard / type 2 coordination:Telemecanique catalogue 24520Factory-tested coordination of the circuit breaker-contactor assemblycontinuity of service & low maintenance

Isc 42kATeSysGV2-DP132


For the 15 kilowatt motors, the first choice is appropriate for operation in normal conditions, with short-circuit current limited to 50kA.# Type 2 coordination specified by the IEC 947-4-1 standard ensures that the contactor remains operational after a short-circuit. This provides # good continuity of service and needs low maintenance.We refer to the # Tlmcanique catalogue to coordinate all the constraints: the table concerning #Direct-On-Line starting, for the # 410V voltage, designates, for a power rating of # 15kW, the # TeSys (pronounced Tzisse) GV2 DP 132 solution. The breaking capacity is given for # 50kA.This is a solution that comprises 2 devices with all the functions required:- the motor protection function, including # disconnection with short-circuit protection and # overload protection (with its thermal relay)- and the contactor function # with LC1-D32This # circuit breaker-contactor association is perfectly coordinated and offers the guarantee of a factory-tested assembly.

- 15kW, high short-circuit current Robustness

CompactNS80-HMAcircuit breakerIn50A, Isc 70kA

complementary technical information LC1-D40contactor

LRD-33 53

IEC 60947-4-1 standard / type 2: continuity of service & low maintenanceCoordination of 3 factory-tested functions

Isc 42kAMV LV protection coordination October 2005#

In the case of use in severe conditions, particularly when the short-circuit current is high ( # continuity of service and low maintenance are still guaranteed by type 2 coordination according to the standard).

The # Merlin Gerin complementary technical information guide tells us, for this # power rating, to use a combination of 3 devices: a # Compact circuit breaker, the NS80 HMA, with a breaking capacity of # 70kA, with an # LC1 contactor and an # LRD thermal relay. These devices include all the # functions required.# The coordination of 3 factory-tested functions offers the pledge of # robustness.

All-in-one deviceTeSys U15KW

- 15kW: the communicating solution IEC 60947-6-2 standard: continuity of service

All-in-oneIsc 42kASelf-coordinatedFully optimized for motor control in building automation systems

CPS (Control and Protection Switching devices) categoryTelemecaniquecatalogue MV LV protection coordination October 2005#

The third choice meets the need for integration in automation systems and connection to communication networks.

The coordination levels with guaranteed #continuity of service are those of the # CPS, Control and Protection Switching devices, category. Our choice is Tlmcanique's # TeSys U: an # all-in-one product which includes # all the functions, in # self-coordinated mode.

It is # fully optimized for motor control integrated in building automation systems.

complementary technical information- 55kW: star-delta starting

3 x LC1-D115contactors

Compact NS160 SX circuit breakerSTR22MEIn160A, Isc 50kA

Coordination of factory-tested functionsIEC 60947-4-1 standard: type 2

Isc 42kAMV LV protection coordination October 2005#

Now let's look at the 55 kilowatt motors. Schneider Electric proposes a solution with # type 2 coordination.The # Merlin Gerin and Tlmcanique catalogues advocate, for # this power rating, an # NS 160-SX circuit breaker with a # special motor protection control unit (STR22ME), and # 3 x LC1 contactors for star-delta starting.All the # functions are provided.

Once again, we have the guarantee of # the coordination of factory-tested functions.G/ OVERVIEW OF DESIGN ASSISTANCE TOOLS


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BLogic discrimination in MV: airportLV motor protection coordination: industrial building?Coordination DiscriminationCascadingProduct overview: Guiding SystemDesign assistance toolsDesign assistance toolsMV LV protection coordination October 2005#

Here is a summary of the # assistance tools that we've mentioned throughout the examples.Budget & choice of architecture Electrical installation designCall for tendersInstallation- tools for each design phase MV LV protection coordination October 2005#

These tools are available to facilitate each of the 4 phases:- the # budget assessment and choice of architecture phase: in this phase, far upstream, the main lines of technical solutions and their costs are defined,- the actual detailed # design phase,- the #call for tenders phase with the writing of the specifications,- and the # physical installation of equipment phase, including all the parameter setting.

Cahiers techniques

Industrial Buildingsolution guideRef BLDED104015EN

Commercial Centersolution guideRef BLDED102072EN

Officesolution guideRef BLDED103060 ENwww.schneider-electric.com/wps/myportal

Distribution networkdesign guideRef Oct. 1998CorazzaMV distribution networkdesign guideIndustrial electrical network design guide

Ref 6883427/APrv / JeannotIndustrial electrical networkdesign guide- phase of budget assessment & choice of architecture scenarios MV LV protection coordination October 2005#

For the budget assessment phase, SE provides: - # specific solution guides for industrial buildings, commercial centers and so on, - and # network design guides, for industrial networks for instance, - added to which is the complete collection of # cahiers techniques publications found easily on the # Website.- phase of electrical installation detailed design phase

MV protection guideRef CG0021ENDesign software

Ref Ecodial 3

Complementary technical informationRef ABTED305161EN

Electrical installation guideRef MD1 ELG 2EExpert Guide No. 5 LV protection coordination

Ref DBTP107GU/ENG3 LV installation designT3 MV installation design


For the design phase: The main reference document is:- the # Electrical installation guide and its annexes such as # "complementary technical information".Other tools are:- the # MV protection guide,- # Expert guide no. 5 on LV protection coordination # Ecodial software, for application calculations and the selection of products, and the # customer training catalogue, including 2 main modules: G3 for LV, and T3 for MV.- technical specification writing and call for tenders phase

Ref eSpec

Products & systems catalogueMV LV protection coordination October 2005#

For the writing of the specifications necessary for the call for tenders phase:we use the # eSpec software, a writing assistance tool, and the # product catalogues- installation phase

LV switchboard implementation guideRef DESW043EN

Products & systems catalogue

MV protection guideRef CG0021ENMV LV protection coordination October 2005#

For the installation phase, we refer mainly to 2 guides:- the # protection guide, which presents the parameter settings for the various operating principles, the # implementation guide, which gives the standard professional practices for low voltage switchboards.These guides are completed by all the # product catalogues.

Careful thought has been given to all the phases and you'll appreciate the quality of all our tools.Summaries of discrimination, cascading and motor coordinationH/ SUMMARIES OF DISCRIMINATION, CASCADING AND TYPES OF MOTOR COORDINATION

Source redundancy and discrimination: hospital Cost reduction: officesCost reduction: workshopLV ring distribution system: factory

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BLogic discrimination in MV: airportLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascadingProduct overview: Guiding SystemSummaries of discrimination, cascading and motor coordinationMV LV protection coordination October 2005#

Let's now have a brief # presentation of some theoretical summaries of the topics that will be addressed in the various applications.

Isc max23 kA= Icu CB2 (NS) - IEC 60947-2 standard: LV discrimination thresholdTotal discrimination if Is > Isc of CB2 Partial discrimination if Is < Isc of CB2IEC 60947-2Annex ATotal discrimination TNW 20H1

Icu 50kA NS 1000N Is20 kAIsc max 6kA 50 kAIsIsc max 50kA

Selectivity limit currentIsIs20 kA(e.g "hospital case")MV LV protection coordination October 2005#

# Annex A of the standard stipulates discrimination and cascading in Low Voltage.For a given pair of circuit breakers, a current threshold, called # "selectivity limit current ", or Is, is defined.There is # total discrimination when Is is greater than the short-circuit current. Whatever the # fault, only # CB2 trips.There is # partial discrimination when Is is less than the short-circuit current. In this example: # up to 20 kA, # discrimination is ensured, but between # 20 and 23 kA, it # is not.

In # addition to discrimination according to the standards, manufacturers may announce discrimination intrinsically, for example # total discrimination T for a # given CB1/CB2 pair when # discrimination is ensured up to the # breaking capacity of CB2, as in the example in the "Hospital" case.- current and time discrimination Protection Guide no. 5DBTP107GU/ENCB2CB1Timet (s)

I (A)CurrentEnergy

CB1CB2MV LV protection coordination October 2005#

Here are summaries of the different types of discrimination for # 2 series-mounted circuit breakers # CB1 and # CB2: # current discrimination is obtained by arranging the tripping curves in # current steps,time # discrimination is obtained by arranging the tripping curves # in time steps.

Plus, there is # energy discrimination with very high currents, when the tripping curves come together. It is obtained by combining two circuit breakers with different tripping energy levels. To understand this, lets look more closely at how a breaking pole works with this level of current.

- breaking pole of a Compact NS circuit breakerRewindingMV LV protection coordination October 2005#

- breaking pole of a Compact NS circuit breakerChamberArc chuteFixed contactsMoving contactsPressure sensor: piston + springajouter sans son + connections See animation againMV LV protection coordination October 2005#

- breaking by Compact NS if high IscRewindingMV LV protection coordination October 2005#

- breaking by Compact NS if high IscShort-circuitThe contacts start to open an arc is createdThe pressure rises until tripping occurs See animation againMV LV protection coordination October 2005#

- energy discrimination with Compact NSRewindingMV LV protection coordination October 2005#

- energy discrimination with Compact NSThe pressure has not reached the tripping threshold for CB D1Short-circuitCB D2 starts to open arc in CB D2The pressure rises in CB D2.. CB D1 starts to open arc in CB D1The pressure rises in CB D1 and CB D2.. CB D2, which is smaller, trips2 circuit breakers in cascading arrangementCB D2 < CB D1See animation againCurrent-limiting: absorbs energyTrippingMV LV protection coordination October 2005#

- energy discrimination time diagram

CB2 starts to openCB1 starts to openCB2 tripsProspective IscWithout the help of CB1eUCB2UCB1UCB1UCB2iMV LV protection coordination October 2005#

Here is the # simplified diagram of the previous circuit, and the # time diagram that goes with it, showing the # current, # the network voltage, # CB1 voltage, and # CB2 voltage.When a # short-circuit occurs, fault current is seen on the green curve;# the CB2 contacts open, and # then the CB1 contacts open, # and the current goes down.After that, the current is interrupted.CB1 does not trip.

The dotted lines show the # prospective short-circuit current curve, and the curve that would be obtained without # the help of CB1.

Manque traduction- logic discrimination Shorten fault clearance time when there are many levelsBackup systemIn the event of a faultTripping time independent of the position of the fault and the number of protection devicesWireless, wire connections

SourceFor all networksOnly the closest circuit breaker tripsEach circuit breaker blocks the one upstream MV and LV ring system problemProtection Guide n5DBTP107GU/ENMV LV protection coordination October 2005#

In order to use logic discrimination, it's necessary to include an # additional link between the protection relays, enabling them to exchange information. # In the event of a fault on the network, all the relays detect the overcurrent and, at the same time, send a #blocking signal to the relays situated directly upstream. Each signal-sender maintains the signal for the time normally required for it to break. The device at the bottom of the chain, not having received a blocking signal, trips.It's # the circuit breaker situated the closest, directly upstream of the fault that trips.This discrimination mode was developed to make up for the time delays required for time discrimination, particularly when there are many levels. Logic discrimination is therefore used when # you want to reduce fault clearance time.# Tripping time is independent of the position of the fault and the number of protection devices.The logic program even allows for relay failure, since once the normal tripping delay runs out, the message blocking the adjacent circuit breaker becomes inactive and it can then take over as # backup. This solution is applicable to # all types of network, and is especially appropriate for # MV and LV ring systems.- types of coordination for motor protectionComplementary technical informationIEC 60947-4-1 standard according to the state of switchgear after tests in extreme conditionsType 1 coordination Type 2 coordinationelements other than the contactor and relays not damagedslight welding of contacts, easily separatedprotection and controlgear remains operational deterioration is possible, as long as there is no risk for the operator High-quality maintenance serviceReduced switchgear costContinuity of service essentialExplicitly specifiedContinuity of service not required or ensured by replacement of rackReduced maintenance serviceMV LV protection coordination October 2005#

Let's look now at how the types of coordination are defined for motor protection.The # standard stipulates tests aimed at putting the switchgear in extreme conditions. # It defines two types, according to the state of the components after the test: # type 1 coordination: which accepts a # certain deterioration of the contactors and relays, as long as there is no risk for the operator, and that # elements other than the contactor and relay are not damaged, # type 2 coordination: which tolerates only a # slight welding of the contacts of the contactor or starter, which can be easily separated. The # protection and controlgear functions must remain operational.

To know which type to choose, you need to take operating parameters into account: requirements and cost.# Type 1 tends to be found in installations with # high-quality maintenance service, in which the # cost of the switchgear is low and # continuity of service is either not required or is ensured by the replacement of the faulty motor rack.It's best to use # type 2 if # continuity of service is essential, if # maintenance service is reduced, or when this type is # explicitly specified.

This is the end of the summaries chapter.I/ OVERVIEW OF MERLIN GERIN PRODUCTS and the Guiding System


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BLogic discrimination in MV: airportLV motor protection coordination: industrial buildingDesign assistance tools?Coordination DiscriminationCascading Product overview: Guiding System Product overview: Guiding System MV LV protection coordination October 2005#

We'll finish off now with an # overview of the product catalogue which is part of the Merlin Gerin brand Guiding System.- an offer of products for all installationsHV/MV substationMV/LV transformer protection

Main Low Voltage Switchboard(MLVS)PanelboardFinal distribution boardBusbar trunkingMotor controlMMV LV protection coordination October 2005#

The Merlin Gerin product catalogue serves the # many different levels of electrical distribution:- the # HV/MV substation (or primary substation),- the MV/MV substation, not shown here, but which in certain cases is needed to adjust the voltage, or to distribute better,- the # MV/LV substation (or secondary substation),- the # main LV switchboard which can supply:- # distribution by busbar trunking- the # panelboard,- the # motor control center- and, lastly, the # final distribution board.

- HV/MV substation

fixed13.8 kV GenieEvo

EvolisCircuit breakers24 kV fixed/drawout

drawout24 kV MCset/Nex

Fluair 400drawout36 kV

CT/VTMeasurement transformer and sensors

SepamDigital protection relaysmotor control7.2 kVMotorpact

SwitchboardsProtection system componentsMV LV protection coordination October 2005#

For the HV/MV substation, here are the # main products: - # switchboards and switchgear: # drawout and # fixed and, # protection system components: # circuit breakers, # sensors and # relays.

RM6Compact switchboards 24 kV

CAS36Compact switchboards 36 kV

SM6Modularswitchboards 24 kV

TrihalDry type, cast resin MV/LV transformers

EasergyT200Control units

EasergyFlairFault current detectorsSwitchboards& transformersComponents- MV/LV protection MV LV protection coordination October 2005#

For MV/LV protection, our catalogue # offers:- # 2 groups of switchboards: # compact and # modular, and # MV/LV transformers,- as well as # components: # control units and # fault detectors.- LV distribution

CanalisBusbartrunking

MMLVS

OkkenPlug-inswitchboards

Prisma plus

BloksetPragmaFinal distribution panels


Starting with the main LV switchboard, there's a # full range of switchboards available, plus busbar trunking for # distributed supply.- LV distribution: componentsM

VigirexResidual current devices

VigilhomInsulation monitoring units

PM500/800Power metersCM3000/4000Advanced power monitoring units

MasterpactPower circuit breakers

InterpactSwitches

Compact NSMolded case circuit breakersMulti9Modular circuit breakers


You # can discover here the # main low voltage components.Continuity of service

Safety of people and equipment

- Guiding System Consistent products: MV and LV

Protection coordination answers 3 requirements Merlin Gerin protection specialist

See you soon!Optimization of installation costsHigh-performing design assistance tools


To # conclude: we've shown how # protection coordination answers 3 requirements: # safety of people and equipment, # continuity of service and # optimization of installation costs. The standards provide a precise framework for these requirements. All through the chapters, practical applications have been presented in various situations.

# Merlin Gerin is the brand of a long-standing protection specialist. That's why we can provide # a wide catalogue of consistent products in both medium and low voltage,and # a large number of high-performing tools for assistance in the installation design business.

All of this makes up a # comprehensive system available to all professionals, to guide you toward the best solutions, in compliance with the IEC standards.

Don't hesitate to contact our salespeople and technicians for further information.Thank you for your attention # have a good trip and see you soon!

mv & lv protection coordination

Documents

coordination of protection

types of coordination

coordination of medium

types of motor coordination

motor protection devices

equipment discrimination

upstream circuit breaker

main design assistance