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Indoor High Voltage Vacuum Breaker

Indoor Vacuum Circuit Breaker 12kV

Indoor Vacuum Circuit Breaker 12kV

Mostly purpose ZN73A-12/D type indoor high-voltage permanent magnetic vacuum circuit breaker,an advanced product in China,adopts self-developed YG type permanent magetic operating mechanism with either manual switching off or electric switching on/off function,which leaves out complex and......

Mostly purpose
ZN73A-12/D type indoor high-voltage permanent magnetic vacuum circuit breaker,an advanced product in China,adopts self-developed YG type permanent magetic operating mechanism with either manual switching off or electric switching on/off function,which leaves out complex and damageable energy storage and locking device of traditional spring mechanism,and greatly simplifies transmission link,especially for the manual switching off device.It is with load emergent switching off operation when it is used in fault condition of secondary operating circuit,which tryly realizes high reliability,long service life,examination and repair exemption,simple maintenance.The service life reaches 100,000 times in normal condition.

Technic Parameter 

Item

Unit

Parameter

Nominal Voltage

KV

12

Nominal Durable Voltage for Short Time Power Frequency(1 min)

KV

42

Nominal Durable Voltage for Thunderer     LIghtning Impact(peak value)

KV

75

Nominal Frequency

HZ

50

Nominal Current

A

630-1250 1250-3150 1250-4000

Nominal Short-circuit on-off Current

kA

20 25 31.5 40

Nominal Thermostatic Current(effective value)

kA

20 25 31.5 40

Nominal Durable Current(peak value)

kA

50 63 80 100

Switch Current of Nominal Short-circuit

kA

50 63 80 100

Substantial time of Nominal Short-circuit

S

4

Durable Voltage for Secondary Retum Power Frequency(1 min)

V

2000

Nominal Operation Order

 

off Minute-0.3s-Combined on/off-180s-Combined/min on/off

Switch currentfor Nominal Single/back to back Condenser Group

A

6308400

Switch-off-time(Nominal voltage)

ms

≤50

Switch-on-time(Nominal voltage)

ms

≤75

Mechanism service Life

≥100000

Switch Times for Nominal Short-circuit Current

mm

30

Cumulative Abrasion Thickening  by    motive and static Contact

mm

3

Contact Open Distance

mm

11±1*

Excess Stroke

mm

3.5±0.5

Contact Switch-on Time

ms

≤2(40KA≤3)

Three-phase Switch-off-on Difference

ms

≤2

Switch-off speed on Average

m/s

0.8-1.2

Switch-on speed on Average

m/s

0.5-0.8

Center Distance

mm

210 275

Return Electric Resistance for Capstan Electricity

≤45(Less than 1250A)≤40(1600-2000A)≤30(more than 2500A)

Contact Pressure for Contact Switch on

N

2000±200(20kA) 2400±200(25KA)
3100±200(31.5KA) 4300±200(40KA)


Relevant technical parameter  shall be adjusted for permanent Magnet Mechanism,if there are special require  ments for operational power supply(for example:DC110,AC/DC)
9±1mm equipped with west House vacuum chamber
8±1mm equipped with Siemens vacuum chamber

Externality & Build in Dimension

图1.jpg

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