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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.
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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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