High voltage outdoor 72.5kv sf6 circuit breaker

Specifications Less maintenance

Safe and reliable

High breaking capacity

Frequent operation available

30 years Manufacturer

  Description Three phase 50HZ LW series outdoor SF6 Circuit Breaker, with spring operation mechanism, is suitable for control and protection of 110kV power distribution system.Also it can be used as interconnecting circuit breaker or used in capacitor bank.   Normal operating conditions Solar radiation: 1000W/m2 Humidity: 1) average relative humidity over a 24 hour period, less than or equal to 95%
2) average relative humidity over a 1 month period, less than or equal to 90%
Wind speed:less than 34m/s Earthquake resistance capacity: horizontal acceleration:0.250g vertical acceleration:0.125g Pollution degree:III degree(25mm/kV) Icing thickness:10mm(wind speed less than 15m/s per hour) Protection degree:IP5W   Techniacl Data  

Lw36-72.5       outdoor high voltage AC SF6 circuit breaker
Name		Unit	Value
Rated voltage		kV	72.5
Rated power frequency withstand voltage(1min)	To earth	KV	K-160
	Between interrupter		K-200
Rated thunder impulse withstand voltage	To earth		K-350
	Between interrupter		K-410
Power frequency withstand voltage under zero gauge pressure of SF6(5min)			K-84
Rated frequency		Hz	50
Rated current		A	3150
Amplitude factor			1.5
Rated short-circuit breaking current		kA	31.5
Rated short-circuit breaking current(peak)		kA	80
Rated short-circuit withstand current		kA	31.5
Rated peak value withstand current			80
Rated short-circuit duration		s	4
Rated out-of-phase breaking current		KA	8
Breaking current of close-in fault		kA	90%lk,75%lk
Rated line-charging breaking current		A	10
Operating sequence			O-0.3s-CO-180s-CO
Resistance of the main circuit		μ Ω	≤40
Rated gauge pressure of SF6(20 °C)		Mpa	0.4
Minimum functional gauge pressure(20 °C)		Mpa	0.35 ±0.03/0.30 ± 0.03
Annual leakage rate of SF6			<0.5%
Amount of water of SF6(V/V)		ppm	≤150x 10-6
Mechanical life		times	10000
Electrical level of ratio interference		μV	≤500
Creepage distance	Between interrupter	mm	2585
	To earth		2248
Weight of the SF6		kg	8
Weight of the circuit breaker		kg	1300
Note: external insulation level is charged by modified coefficient. Every 2000m of altitude, K=1.13; altitude=3000m, K=1.28

   

Main techical data of structure
Name		Unit	Value
Auxiliary circuit voltage		V	DC220 or DC110
Thevoltage/current of the opening and closing coils		V/A	DC110/4;DC220/2
Energy storage motor	Rated voltage	V	DC220,AC220/DC110,AC110
	The range of normal working voltage	V	85%-110%
	Power	W	600
The energy storage time for motor		s	≤15
The loop voltage of the heater and the lamp		V	AC220
Rated voltage of the auxiliary switch		V	DC220,AC220
Rated current of the auxiliary siwtch		A	10
Contacts of the auxiliary switches			10 normal opened contacts and 10 normal closed contacts

     

Mechnical adjustment of the breaker
Name	Unit	Value
Center distance between poles	mm	1200
Strode length of the moving contact	mm	120+30
Contact stroke length of the moving contact	mm	120+30
Length of the inter phase operating connecting rod	mm	110+30
Switch-off speed	m/s	4.2-5m/s
Switch-on speed	m/s	2.2-3m/s
Switch-off time	ms	≤40
Switch-on time	ms	≤100
Break time	ms	≤60
Swtich-on/off time	ms	≤80
Switch-off/on time	ms	300
The time difference of the opening of three phases	ms	≤2
The time difference of the closing of three phases	ms	≤3

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