dynamic voltage restorer - condensator … · 08 oskαr®-cooling system oskαr® powered by...

D Y N A M I C V O L T A G E R E S T O R E R

CONDO D2061511

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OSKαR® powered by Condensator Dominit

OSKαR® setting new standards in power quality.

Voltage dips in the electrical power supply are one of the main reasons for ex-

pensive unscheduled production outages. The voltage range of +-10 % of the

nominal voltage defined in EN 50160 has to be guaranteed by the utility only in

95 % of the 10 minute average values. Incidents which are shorter than 10 minu-

tes cannot be avoided and may not be criticized.

IEC 61000 2-8 describes the impacts of voltage dips. If the remaining voltage is

less than 85 % of the nominal voltage, typically problems with frequency conver-

ters and switch-mode power supplies will occur. According to own investigations

commercially available contactors are in an undefined status if the voltage goes

down to 80% of nominal voltage, even if the voltage dip lasts only for one period

(20 ms).

Also rugged consumers like asynchronous motors will be affected if the voltage

drops to less than 75 % of the nominal voltage for several periods.

OSKαR® keeps the grid vol-

tage highly dynamic at the

desired target value and the

load will ride through typical

voltage dips without even ta-

king notice. Typical voltage

dips will be passed through

brilliantly. Reach a new le-

vel of power quality with

OSKαR®!

OSKαR® ONLINE-SUPPLY-KORRECTION WITH ADAPTIVE REGULATION

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online-supply-korrection with adaptive regulation

DIRECT EFFECTSCircuit breakers of the utilities trip (typical reaction time 100-150 ms)

Local events spread through the mains

Contactors and relays drop off

Measuring devices and sensors detect wrong values

Frequency converters fails

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REASONS FOR VOLTAGE DIPS IN THE MAINS POWER SUPPLY

Short-circuits in the distribution grid

Strikes of lightening

Heavy loads

Big load changes

Switching operations of utilities

Turn on- and turn off of power plants

Instabele energie“production“ (wind-/solar farms) renewables

Birds and bird droppings

Other events

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CONSEQUENCESProduction processes stop

Production quality criteria are violated

Financial losses arise

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OSKαR®-GRID-PROTECTION

Realtime voltage correction (< 1 ms)

Circuit power remains nearly unchanged

Voltage dips down to 40 % of the nominal voltage can be corrected

Efficiency > 98 %

Extended operation is possible

Protection against overvoltages

No energy storage needed

Minimal space requirements

Low purchase and maintenance costs

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PRO

PUMV

circuit breaker/fuse

LV

protected loads

PUMV

LV

protected loads

unprotected loads

PUMV

LV

To protect production processes, OSKαR® will

be connected between the supplying transformer

and the load(s). The short circuit power remains

nearly unchanged by adding OSKαR®. All selec-

tivity criteria for fuses and circuit breakers remain

unchanged. OSKαR® can be extended by modu-

les and is therefore sufficient for protecting single

machines as well as complete supply systems.

unprotected loads

OSKαR® is equipped with an online con-

trol which keeps the voltage continuously

at the desired value:

400 V ordered, 400 V delivered!

As soon as OSKαR® detects a difference

between the real voltage and the targed

voltage it starts to adjust with a reaction

time of 140 µs.

The voltage dip is fully corrected in less

than half a cycle.

3 phase voltage dips of up to 40 % and

overvoltages of up to 20 % are corrected.

OSKαR®-FUNCTION PRINCIPLE

incoming line transformer load

Bypass

DC-Bus

AC/DC-rectifier

DC/AC-inverter

DC-Bus

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rectifier-module

inverter-module

bypass-module

transformer cell

SET-UP

OSKαR® is executed as conventio-

nal switchgear where all components

necessary to ensure a perfect voltage

are mounted inside a cubicle. The seri-

al coupling (or injection) transformer is

located encapsulated in the lower sec-

tion of the cubicle and directly fixed on

the base. The power electronic modules

are located in the upper part of the cu-

bicle. The power electronics consist of

three functional units, one rectifier-, one

inverter- and a bypass-module. Further

technical details are described on

page 11.

transformer control

OSKαR® 300 kVA

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OSKαR®-COOLING SYSTEM


A sophisticated ventilation system is im-

plemented in order to remove the losses

during operation (≤ 3 kW) appropriately

out of the cubicle. In the lower section two

powerful fans guarantee a sufficient inco-

ming airflow which is guided directly into

the transformer compartment. This air-

flow is then guided between the backwall

and the segregation wall behind the power

electronic modules directly to the air out-

lets at the roof. Each power electronic mo-

dule has its own fans which blow air from

the middle part of the cubicle through the

modules. The hot air will be dissipated th-

rough the back-wall and ventilation grids

located in the upper part.

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BYPASS

In the case of a short circuit on the

load side or under overload conditions

OSKαR® switches into bypass mode.

The Bypass protects the power electro-

nic components of OSKαR®. This also

insures, that the short circuit power on

the load side remains unchanged and

fuses and circuit breakers as well as

other protection equipment operate in

the usual way.

The multiply redundant designed

bypass ensureds, that the maximum

short circuit power is provided when it

is needed.

The short circuit power is an important

quality aspect of every electrical ener-

gy supply system regardless of whether

operation is disrupted or not. Harmonic

currents have a lower impact, the hig-

her the short circuit power is.

With its uk of < 2,5 %, the serial coup-

ling transformer of OSKαR® is dimen-

sioned for a short circuit power of 40

times of its rated power.

u Thyristor switch for bypassing

without any delay

u Bypass contactor for over-

load and short circuit

u Redundant 2nd bypass

contactor for short circuit on

the load side

OSKαR®-MEASURING RESULTS

Theory and practice must not necessarily

deviate from each other. The characteristic

curves taken into account for the OSKαR®

design have been proved in reality.

The achievable correction values of

OSKαR® are shown in the diagrams

for three-phase and single-phase volta-

ge dips. Measured values, monitored in

customer installations, show, that the sta-

ted correctional values are always achie-

ved by the system. The result of the con-

trolled output voltage has a difference to the

target voltage (with load) of about 0,625%.

Such a virtually ideal voltage characteris-

tic can never been seen in a grid without

OSKαR®.

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effective value of load current

effective value of load voltage (output L1)



effective value of supply voltage (incoming)

TECHNICAL DATA – OSKαR®

System concept

Rated power

Nominal network voltage

Rated frequency

Network configuration

Grid short circuit power

Correction range

Single-phase dips

Three-phase dips

Overload capability

Overload in bypass-mode

Accuracy of the output voltage

Accuracy during voltage dips

Reaction time

Transient time

System efficiency

Communication

Parametrization/Analysis

Degree of protection

Ambient temperature

Dimensions (w x d x h)

Weight

Power connection

Height of connection points

Door hinges

Ordering code

Options

modular

300 kVA*

400 V*

50/60 Hz ± 5 %

3-phase, TN

scalable

40% for 30 s and ± 10% continuously

40 % UN � 100 % (30 s)

60 % UN � 100 % (30 s), 50 % UN �90 % (15 s)

150 % IN (30 s)

20 kA / 150 ms, 40 kA / 10 ms

≤ ± 1 %

± 3 %

140 µs

< 10 ms

> 98 %

Ethernet (RJ45) / FTP-Server / Mail-Server / Modbus

touch panel / Log-SD-Card / Mail

IP 20D*

0 °C (min.), 40 °C (max.)

600 x 800 x 2282 mm (incl. socket)

900 kg

from the bottom

incoming 800 mm, outgoing 370 mm

right

OS 300 - 400 - 40 %

Maintenance bypass for bridging the system,

Measuring device for independent analysis Class A

* Other ratings on request

Subject to changes

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Depending on industrial sector and techno-

logy the costs for voltage dips vary in cha-

racter and height.

u Additional costs for adjustments

u Costs for reset or restart of

machines

u Costs for longer outages of the

production

u Logistic problems in extremely

sequenced production

u Maintenance and repair costs

in cases of damages

According to scientific studies, the

costs for one dip vary from a few thous-

and Euro in simple industrial processes

up to six figure sums in highly sensible

production segments such as semicon-

ductors and pharmaceutical producti-

on.

In general, all high technology pro-

duction lines and almost every process

where the torque and rotation speed of

motors have to be kept stable simulta-

neously are at particular risk.

RELEVANCE


Pharmaceutical industry (climatisation)

Medical technology (MRI scanner, intracardiac catheter robots)

Big industrial plants

Coating processes (Voltage dips have a direct impact on the film

thickness, control problems)

Grinding processes (Voltage variations have a direct impact on the

quality of the process accuracy)

Measuring systems (high-precision processes which need a stable supply,

e. g. testing of ABS-systems)

Highly dynamic processes

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NOTES

CONTACT DETAILS

Condensator Dominit GmbHAn der Bremecke 8 · D-59929 BrilonPhone +49 (0) 2961 782-0Fax +49 (0) 2961 782-36E-Mail [email protected] www.condensator-dominit.de

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Condensator Dominit GmbH

An der Bremecke 8

D-59929 Brilon

Phone +49 (0) 2961 - 782-0

Fax +49 (0) 2961 782-36

E-Mail [email protected]

Web www.condensator-dominit.de

dynamic voltage restorer - condensator … · 08 oskαr®-cooling system oskαr® powered by...

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