NewNew　　ConceptConceptVacuum Circuit BreakerVacuum Circuit Breaker

SMART VCBTYPE “VZ”

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1.1.New Vacuum Arc ControlNew Vacuum Arc Control

TechnologyTechnology

2.2.High Reliability OperatingHigh Reliability Operating

MechanismMechanism

Vacuum Circuit BreakerVacuum Circuit Breaker

Front View

1212kV-1250A-40kAkV-1250A-40kASide Cross Section

VacuumVacuumInterrupterInterrupterOperatingOperating

MechanismMechanism

FrameFrameRear View

Electrode

Vacuum InterrupterVacuum Interrupter

CurrentCurrentCarryingCarrying

RodRod

ContactContactAxial

MagneticField

CoilCoil

Axial Magnetic Field ElectrodeAxial Magnetic Field Electrode

ElectrodeElectrode AnodeAnode

CathodeCathode

Vacuum ArcVacuum Arc

InsulationInsulationEnclosureEnclosure

����������������������������������������������������������������������FeaturesFeaturesFeatures

1. 1. High Current Interrupting CapabilityHigh Current Interrupting Capability

2.Reduction of Operating Energy

•• Development of Contact Material

•• Optimizing Closing Cam

••Improvement of Electrode ConstructionImprovement of Electrode Construction

New Vacuum Arc Control TechnologyNew Vacuum Arc Control Technology

Mag

netic

Fie

ldM

agne

tic F

ield

Inte

nsity

Inte

nsity

Axial Magnetic FieldAxial Magnetic FieldElectrodeElectrode

Self Arc Diffusion bySelf Arc Diffusion byElectrodeElectrode

CathodeCathode

AnodeAnode

CathodeCathode

AnodeAnode

Position on ElectrodePosition on Electrode Position on ElectrodePosition on Electrode

((AMF)AMF) ((SADE)SADE)

Comparison of Electrode DiameterComparison of Electrode Diameterand Vacuum Interrupterand Vacuum Interrupter

19601960ssSpiralSpiral

19801980ssAMFAMF SADESADE

PresentPresent

1212kV-1250A-25kAkV-1250A-25kA

����������������������������������������������������������������������FeaturesFeaturesFeatures1. High Current Interrupting Capability

2.2.Reduction of Operating EnergyReduction of Operating Energy

• Improvement of Electrode Construction

•• Development of Contact MaterialDevelopment of Contact Material

•• Optimizing Closing CamOptimizing Closing Cam

During Closing

Opening Position

ClosingClosingSpringSpring

ContactContactForce SpringForce Spring ClosingClosing

CamCam

OpeningOpeningSpringSpring

ContactContact

Operating MechanismOperating Mechanism

Comparison of Operating Energy(25kA)Comparison of Operating Energy(25kA)

Conventional Present

Contact Travel Energy

Opening Spring EnergyO

pera

ting

Ener

gy [J

]

0000

1 01 01 01 0

2 02 02 02 0

3 03 03 03 0

4 04 04 04 0

5 05 05 05 0

6 06 06 06 0

7 07 07 07 0

8 08 08 08 0

Contact Force Spring Energy

����������������������������������������������������������������������������Type TestType TestType Test•• Short-CircuitShort-Circuit Current Test Current Test•• Mechanical Life TestMechanical Life Test•• Temperature Rise TestTemperature Rise Test•• Short Time Withstand testShort Time Withstand test

•• Mechanical Operating TestMechanical Operating Test

•• Out-of-Phase Making and Breaking TestOut-of-Phase Making and Breaking Test•• CapacitiveCapacitive Current Switching test Current Switching test

•• Measurement of The Resistance of Main CircuitMeasurement of The Resistance of Main CircuitTestTest

Short-CircuitShort-Circuit Test Result Test Result(12(12kV-40kA)kV-40kA)

VZ-10R40 (12kV-4000A-40kA)VZ-10R40 (12kV-4000A-40kA)

Front View

Rear View