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126kV Intelligent Combination Electrical Appliance

252kV intelligent combination electrical appliance

Overview

? ZF50-252 (L) gas insulated metal enclosed switchgear (GIS), with a rated current of 4000A and a rated breaking current of 50kA, is a high-tech product developed through optimization and design based on the digestion and absorption of advanced GIS/GCB technology at home and abroad.

Performance Characteristics

Modular design to meet the different needs of users

Miniaturized design with high technical performance

Adapting to various forms of operating mechanisms

maintenance free operation

Short on-site installation cycle and high operational reliability.

Main electrical parameters of 252kV GIS:

 

Project

Parameter

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