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Rated voltage

252 kV

Rated insulation level

1min power frequency withstand voltage (break/ground)

（460+145）kV/460kV

Lightning impulse withstand voltage (break/ground)

（1050+200）kV/1050 kV

Rated frequency

50 Hz

Rated current

3150、4000 A

Rated short-circuit breaking current

50 kA

Rated peak withstand current

125 kA

Short time withstand current (effective value)

50 kA/3s

SF6 gas leakage rate

<0.3%/year

SF6 gas humidity

Electrolytic decomposition products (handover acceptance value/long-term operation allowable value)

≤150/300uL/L

No electrolytic decomposition products (handover acceptance value/long-term operation allowable value)

≤250/500uL/L

Partial discharge

Each interval/individual insulation component

≤5/3Pc

Structural layout

Circuit breaker

Three phase distribution box

Main busbar

Three phase common box

Circuit breaker operating mechanism

Hydraulic and spring mechanism

Circuit breaker operation mode

Split phase operation, three-phase mechanical linkage

Spacing size

1.8-2.2m