Description

LW8-40.5, LW8A-40.5 series sulfur hexafluoride circuit breakers are three-phase AC 50Hz outdoor high-voltage electrical equipment, suitable for the control and protection of 40.5kV transmission and distribution system, can also be used for connection circuit breakers and open and close capacitor Banks. The product can be used with CT14 spring mechanism. The circuit breaker conforms to the national standard GB1984 -- 1989 AC high-voltage circuit breaker and the international electrotechnical commission standard IEC56, IEC6220-100 high-voltage ac circuit breaker.

The product has excellent breaking performance, USES the pressure air type arc extinguishing chamber, the electric life is long, does not replace the sulfur hexafluoride gas, the mechanical reliability is high, the mechanical life is long, can operate frequently; Each set can be equipped with 6-12 current transformers for user's choice. This product adopts the new MKZ model SF6 pointer density meter, the pressure gauge reading is not affected by the temperature change, easy to use.

Main technical parameters

Item		Unit	Data
Rated voltage		KV	40.5
Rated insulation level	Withstand voltage of 1min power frequency	KV	95
	Lightning shock resistance (peak)	KV	185
Rated current		A	1600/2000
Mechanical life		Times	3000
Rated pressure of sulfur hexafluoride (gauge pressure at 20℃)		Mpa	0.45
Locking pressure (gauge pressure at 20℃)		Mpa	0.42
Minimum operating temperature		℃	-30
Rated short circuit breaking current		KA	20/25/31.5
Rated short circuit shut-off current (peak)		KA	63/80
Rated withstand current in short circuit (heat stable current)		KA	25/31.5/100
Rated peak withstand current (dynamic stable current)		KA	63/80/100
Rated out-of-step breaking current		KA	63/80/100
Rated short circuit duration		S	4
Closing time (at rated operating voltage)		S	≤0.1
Switching time (at rated operating voltage)		S	≤0.07
Rated operating sequence			0-0.3-C0-180S-CO
Rated open and close current of a single capacitor bank		A	400
Weight of sulfur hexafluoride gas		kg	8/5
Weight of circuit breaker (including operating mechanism)		kg	14000/1000