VCB - Engineers Australia

10th September, 20091The Joint Electrical Institutions Sydney

VCB


0

20

40

60

80

Conventional Current

[ J ]

Comparison with Operation Energy(Some of Toshiba Case)

Closing

Opening

Pressure to contactSpring for Closing Spring for Opening

Spring for Making Pressure to Contact

VCB Operation Energy

VCB Operation Mechanism


•Contact SeparationTime•Closing Speed

•Opening Speed•Bouncing

•Over stroke

•Welding, Roughness

•Interruption•Re-ignition

Life time of Interrupter

Characteristics of VCB Contacts stroke VS Capabilities

Characteristic of VCB contacts

Consequence


• Frequent Operation

• High Speed Interruption

• Large Capacity (Current Flow )

VCB Application for Special Requirements


Tens of kilometers

System Switching

Frequent Operation

42kVRated Voltage

Mechanical 200,000/ Electrical 100,000Operation

1200ARated Current

Frequent Switching for Transportation System

SubstationSubstation

Shinkansen


24／36 ｋＶRated Voltage

150,000Operation

25kARated Short Circuit Current

1200/2000ＡRated Current

22kV or 33kV Line

VCB

Electric Furnace

Frequent Operation

Frequent VCB for Electric Furnace

TransArc Rod


～

Factory Line

Voltage

GeneratorCommercial

Line

Fault

Facility

ＧDetector

Signal

High Speed Interruption

Voltage dips affect significant facilities;Manufacturing semiconductors, liquid crystal

panels, generators….

Need to interrupt fault current quickly to reduce the severity of voltage dips

Facility

Facility

Facility


BzBr

Magnetic Flux

Current

Cap

acit

or

Vacuum Interrupter

Coil

Permanent Magnet

ThyristorSwitch

Simplified Operation

High Speed VCB

VCB Overview

Insulation Rod

Simplified Construction

Plate

Electromagnetic Repulsion


12000A Continuous Current Rating with Fan

Side View

Front View

Vacuum Interrupter

Fan

Temperature rise Analysis


Solid Insulated SWGR -SIS

Solid Insulated SWGR Overview


External insulation of VI

Air

Insu

lati

on

SF6 Vacuum

1

3

7

SF6

Air

Vacuum

Conventional C-GIS

(Cubic Type Gas Insulated SWGR)

External insulation of VI filled with SF6 gas

VI(Vacuum Interrupter)


Solid Insulated SWGR -SIS

Main circuit live parts adopt an insulation design thatuses solid molding and eliminates SF6 gas.


Comparison of breakdown characteristics between molded electrode and bare electrode.

0.0

1.0

2.0

3.0

4.0

5.0

0 50 100 150

Gap length L [mm]

50%

bre

akdo

wn

volta

ge V

50 [k

V]

Molded electrode

Positive impulse voltage

Bare electrode

L

H.V.

Insulation layer　　　　　thickness 10mm

10

Metal electrode

30 80R15

L

H.V.

Insulation layer　　　　　thickness 10mm

1010

Metal electrode

30 80R15

Composite Insulation

Model of composite

Insulation configuration


Breakdown voltage V (Relative value)

Acc

umul

ated

bre

akdo

wn

prob

abil

ity

P [

%]

Filler: Alumina

Filler:spherical silica

Epoxy casting material

Model configuration

Electrode

Comparison of dielectric breakdown characteristics between developed resin and conventional resin

The insulation performance of developed material is about 1.5 times that of conventional material .

Test situation

3mm

Development of Material for Insulation


φ１６

φ３０

φ１４

１５０

６０

Epoxy Resin

EmbeddedElectrode

EmbeddedElectrode

Test sampleTemperature dependence

of tensile strength

Conventionalmaterial

Developedmaterial

Development of Material for Insulation


SIS for long-term withstand voltage test

Example of Long Term Test


10

100

1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08

Time ［ｍｉｎ］

Voltag

e ［

ｋＶ

］

100

101

106

105

104

103

102

108

107

20

40

60

80

Working voltage : 22kV/√3kV=12.7kV(1.0E)

Applied voltage : 23kV

19.0kV(1.5E)

30年

n=16

2.0年

Long-term withstand test result

Long Term Test Result

2 year 30 year

Voltage in service

Slope;


SF6 0%

Weight 50%

Volume 70%CC--GISGIS

Solid Insulated SWGR (SIS)

SISSISSSISIS


• Vacuum Application to Higher Voltage

Application…

-Currently applied for systems up to 170kV

-245kV systems under development

Towards The Future

168kV Prototype Model(Toshiba)

Discussing to clarify the issues

• Save on Maintenance

-Running cost reduction


Tested Part

To Save on Maintenance on Operation Mechanism

Rotating part in operation mechanism has been investigated.

Test Equipment for Investigation on The Rotating Part

Links

Spring: pressuring test object

ReciprocateMotion


0

0.2

0.4

0.6

0.8

1

0 10000 20000 30000

動作回数

摩擦

係数

•Urea Grease•Bearing Material：SS400•Pressure: 9 N/mm2 ●

18 N/mm2 ◆

Friction Coefficient:0.5

9N/mm2 ･･･28000 Operations18N/mm2 ･･･14000 Operations

Fri

ctio

n C

oef

fici

ent

Example of Test Results

Operations

Number of Operations to Reach to Friction Coefficient of 0.5


0

5

10

15

20

25

30

35千

動作

回数

(×1000回

)

9 12 15 18

面圧［Ｎ/mm２］

•Urea Grease•Bearing Material：SS400

Pressure to Bearing [N/mm2]

Op

erat

ion

s ×

1000

Relation between Pressure and Operation Times

Operation Times Reach to Friction Coefficient 0.5Number of Operations to Reach a Friction Coefficient of 0.5


0

5

10

15

20千

動作

回数

(×1000回

)

None Urea

200

9000

14000

53 140

Relation between Kinds of Grease and Operation

•Bearing Material：SS400•Pressure: 18 N/mm2

Op

erat

ion

s ×

1000

Vacuum Silicon Fluorine

Type of Grease

Operation Times Reach to Friction Coefficient 0.5Number of Operations to Reach to Friction Coefficient of 0.5


Thank you for your attention.

Documents

VCB - Engineers Australia