252kV,550kV Gas Insulated Switchgear (GIS)

comply with IEC 62271-203

Parameters:

Rated voltage:252kV,550kV.

Rated current:2000-6300A

Rated breaking current,3s:50kA

Features:

Compact design,three phases Busbar in common tank,save installation area

Rated breaking current 50kA for the circuit breakers.

High operation reliability,less maintenance.

High anti-seismic capability.

The sealing system which has proven extremely reliable over years of utilizaiton.

Meet customer requirements by modular design.

Rated voltage			kV	252	550
Rated frequency			Hz	50/60
Rated current			A	4000	6300
Rated short-circuit breaking current			kA	50	63
Rated short-time withstand current (r.m.s)			kA	50	63
Rated duration of short-circuit			s	3	3
Rated peak withstand current			kA	125	171
Rated short-duration power-frequency withstand voltage (1 min r.m.s)		Phase-to-earth	kV	460	740
		Across the insolating distance	kV	460+145	740+315
Rated lightning impulse withstand voltage(peak)		Phase-to-earth	kV	1050	1675
		Across the insolating distance	kV	1050+26	1675+450
SF6 gas pressure at 20°c	Circuit breaker	Rated pressure	MPa	0.62
		Alarm pressure	Mpa	0.58
		Lockout pressure	MPa	0.53
	Other	Rated pressure	MPa	0.58
		First alarm pressure	MPa	0.53
		Second alarm pressure	MPa	0.50
Partial discharge at 80% power frequency withstand voltage		Total bay	pC	5
		insulator	pC	3
The times of Rated short circuit making current (FES)			Times	2
Mechanical endurance		Circuit breaker	Times	10000
		DES/FES	Times	5000
Moisture content of SF6 gas	Circuit breaker compartment	commissioning	μL/L	≤150
		operation	μL/L	≤ 250
	Other compartment	commissioning	μL/L	≤ 300
		operation	μL/L	≤ 500
Leakage rate of SF6 gas per year				≤ 0.3%

252kV,550kV Gas Insulated Switchgear (GIS)