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Motor Drive™Circuit Breaker LTB D

with Motor Drive

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Traditional technologyMotor DriveTechnology

Traditional spring operating mechanism:

Closing mechanism

Tripping mechanism

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Motor Drive technologyMotor DriveTechnology

Motor for opening and closing

Control unit

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Motor Drive technology

Mechanical systems and springs are replaced by a motor and drive electronics.

BLK MD

Motor DriveTechnology

The mechanical system is reduced to a minimum. Only one moving part in the operating mechanism.

The next step of drive developmentElectronics are used to operate and control the circuit breaker

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Motor Drive technologyMotor DriveTechnology

Motor for opening and closing

Drive unit with energy storage

Control cubicleSimple torsion tubes between the phases. (No adjustments needed)

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FunctionMotor Drive

Function

A digitally controlled motor directly moving the circuit breaker contacts

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Motor Drive system demonstration

OPEN

Breaker Contact Travel

00100

<<TRIP

msec

mm 00099I O

AC

DC

CLOSED Motor

Resolver

ConverterUnit

I/OUnit

ControlUnit

CapacitorUnit

ChargingUnit

Motor DriveFunction

LOW POWER FLOW

HIGH POWER FLOW

CONTROL SIGNALS

MEASURMENT SIGNALS

STATUS SIGNALS

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Motor DriveTechnology

Spring drive, BLK Motor DriveEnergy storage Trip and close springs Capacitors

Latching Latches and coils Not needed due to construction

Contact travel Pre adjusted Active control

Damping system Mechanical oil dampers Motor *

Mechanical system Arms and links transmits the force between the poles

Torsion tube system with few parts

Interlocking Electro mechanical Logical functions, programmable

Self supervision No Yes, all parts of the drive are continuously checked

Single-pole operated configuration

3 BLK with cubicles1 Central cubicle

3 Motors1 Control cubicle

Auxiliary contacts Mechanical Relays (solid state)

Spring drive vs. Motor Drive, Main differences

* Energy is fed back to the capacitors during retardation

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LTB D with Motor DriveMotor Drive

Configuration

Available for:LTB D 72.5-170 kVSingle and three pole operatedWCB applicationsDCB under development

MD150: Single-pole operationMD300: Three-pole operation

WCB = Withdrawable Circuit BreakerDCB = Disconnecting Circuit Breaker

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Three-pole operated LTB D with MD300 Motor Drive

Configuration

Gas monitor and position of CB easily read from the same side of the breaker

Configuration:Pole beamPhase distance: 1050-2500 mm

Design:Torsion tubes between phasesMotor capable of 750 Nm (Standard car app. 200 Nm)

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Single pole operated LTB D with MD150

Configuration:Pole beam or single stands

Design:One motor at each phasePosition indicator at each phaseMotors capable of 250 Nm

Motor DriveConfiguration

Only one cubicleEasy connection to the motors

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Technical advantagesMotor DriveAdvantages

The aim of reduction of mechanical problems and service requirements during the development has resulted in:

Optimized active controlled contact movementContinuous supervision of the system

Benefits:Easy installationMinimized maintenanceNo lubrication neededEventual faults can be detected before the breaker needs to be operatedIntegrated Condition Monitoring

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Drive diagnostics, Micro motionMotor DriveSupervision

Diagnostic function that performs status checks of the complete breaker while in service.Minimal contact movement are performed at preset time intervals and checks the status of:

Time (ms)

Contact Position

ClosedApprox. 0.5 mm

Open

Contact separation

Unique in-service status check of breaker and driveImproves reliability significantly

Electronic modulesInternal cablingMotorMechanical system

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Drive diagnosticsMotor DriveSupervision

On-line diagnostics of the drive improves the availability. Makes sure that the circuit breaker is ready for operation when its needed.Status check is performed continuously when the drive is energized.

Availability of the breaker increased by self supervision

Motor Drive

Traditional drive

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(Motor Drive) MD ServiceMotor DriveSupervision

MD Service software makes it possible to connect to the drive and get support during installation and service

Download of data enables distance diagnosticsEasy customization of breaker function

Breaker position Operation mode

Alarm/WarningIndication

Energy level

Supply voltage status

SF6 Data

Operation counter

Interlockinformation

System data: Voltage, temp.

Micromotion counter

Breaker info.

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MD Service, connection kitMotor DriveSupervision

Converter RS232 optical / electrical

Optical fiber

MD Service requires a connection kit between the drive and the computer

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Motor DriveReferences

Fyns Net, DenmarkSubstation KingstrupLTB 170D1/B with Motor Drive for 1-pole operationInstalled July, 2002Application: 150 kV line

Sydkraft SwedenVaple, Granlo, Korsta, and Söderåsen transformer substationsLTB 145D1/B with Motor Drive for 1-pole operationInstalled 2001, 2002 and 2003Application: 130 kV capacitor bank

Commercial Installations

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Motor DriveReferences Commercial Installations

VB Elnät, SwedenSubstation FlatenbergLTB 145D1/B with Motor Drive for 3-pole op.Installed July, 2004Application: 130 kV lineFlexible position for Control Cubicle

Pan American Energy, Patagonia, ArgentinaLTB 145D1/B WCB, indoor versionInstalled 2005

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ReferencesMotor DriveReferences

Commercial deliveries of LTB D with MD since 2002.

1-56-1011-2021-30Test breakers Over 100 installations

17 different countries(-2005)

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Motor Drive™ summary

Digitally controlled motor, directly moving the circuit breaker contactsOnly one moving partLow mechanical stressesIntegrated condition monitoringAt present available for:

LTB D 72.5 – 170 kVWCB LTB 72.5 – 145 kVSingle- or three-pole operation

Technology

Benefits:Highest reliabilityLong mechanical lifeIdeally suited for high operating frequencyVery low audible noise

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Ed 2006-04

Motor Drive™

Part II Detailed description

Circuit Breaker LTB D with Motor Drive

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Control cubicleTerminal blocks for connections of the control cables.

Drive unit(MD electronics cubicle)

Motor DriveControl Cubicle

Local control panel.

000000 000000 000000

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Link gearMotor DriveMechanics

160 degree movement, (-5 to 155)Two gas valves per housing.Integrated housing for position indicatorIntegrated fastening flange for the motorTwo X-rings at each side of the shaft provide a good dynamical sealing system.

The lower end of the breaker poles contain a link gear that transforms rotating movement into linear movement of the moving contact.

Simple self latching designFew partsNo adjustments needed

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Motor, technical dataMotor Drive

Modules

Data:Manufacturer: ABBDegree of protection, IP: 65Temperature range -50º to +85ºCRated voltage: 565 VrmsRated speed: 1000 rpm

Single-pole operatedPeak torque: 250 NmWeight: 28 kg

Three-pole operatedPeak torque: 750 NmWeight: 67 kg

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Control cubicle: Drive unit, overviewMotor Drive

Modules

EMC housing

Charger unit

Control unit(I/O boards and control board)

Converters

Capacitor unit

Connections to the motors

The drive unit contains all electronics that controls the motion of the Circuit Breaker contact.

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Drive unit: Capacitor unit, overviewThe capacitor unit is the storage facility of the energy needed to operate the circuit breaker

Motor DriveModules

Insulated busbar

12 electrolytic capacitors

Two groups connected in series – each consisting of 6 capacitors connected in parallell

Well proven design of capacitors

At service discharge of the energy can be made trough the motor(s) or built in discharge resistors.

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Verification of technologyMotor DriveVerification

Alternative drive for BLK 222 according to IEC 62271-100T100s Single- and three-pole operatedMechanical endurance three-pole operated, 10,000Mechanical endurance single-pole operated, 10,000EMC tests, emission and radiation High / Low temp, -50 / +70°CModular tests of electronics:

VibrationHumidity and dry heat

Extended mechanical endurance test:50,000 operations without maintenance of the drive

Extensive testing has been performed to verify the technology and design. Some of the performed tests are:

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