SF6 Dead Tank Circuit Breaker

Item

 parameter

Rated voltage                                    kV

252

Rated frequency                                   Hz

50

Rated current                                     A

3150

Rated short-circuit breaking current                  kA

50

Rated short-circuit makeup current (peak)             kA

125

Rated short-time withstand current                   kA

50

Rated short-circuit duration                           S

2, (3)

Rated peak withstand current                        kA

125

Near-field fault breaking current  L75 L90             kA

37.5/45

Rated phase-out makeup and breaking current         kA

12.5

Rated circuit charge breaking current                  A

160

insulation level

1min rated power-frequency withstand voltage kV (virtual value)       

over ground

460

between fracture

395+145

Rated lightning impulse withstand voltage(1.2/50µs) kV  (peak)

over ground

1050

between fracture

950+206

Rated pull in terminal            N

level vertical

1500

level horizontal

1000

vertical direction

1250

Creepage distance                                mm

6300, 7812

Rated operation sequence

O-0.3s-CO-180s-CO

Gas rated pressure of SF6 (20)                  MPa

0.6

Leak rate of SF6 per year        ≤                  %

1

Moisture content of SF6 gas      ≤                µ L/L

150

Continuous breaking times of rated short-circuit breaking current                                          times

20

Mechanical operation times                        times

3000

Break-brake time                                  ms

18~25

Close-brake time                                  ms

80~100

Break and close time            ≤                  ms

0.3

Close and break time            ≤                  ms

60

Asynchronism of anode-to-cathode break brake

≤                  ms

3

Asynchronism of anode-to-cathode close brake

≤                  ms

5

Monopole gas weight of SF6                         kg

46