1:used circuit breakers 2:outdoor type 3:dirtness resistance 4:spring mechanism 5:three-phase porcelain-pole structure

Company profile:

 China·ZheJiang ChangKai Electrical CO.,LTD was locate d at coastal zone of south of Zhejiang province, that is ,Beautiful Yandan mountain of scenery YueQing known as China Electric Municipality. It possesses one hundred and eighty employees in total, thirty percent of which is various of professional technician. The company has completely pass ed the ISO9001 Quality System certification and obtain ed the production license, CCC Authentication, testing certification. Right of self-supporting importing and exporting. 

The company conducts management principle that the Strong's collab o ration with the strong , utilizing internal resource and absorbing external advantage to greatest degree and establishes long-period collaboration and partner relationship with Xi'an high-voltage research institution , PingGao electric and ZheJiang University, which provides technical support for new product's exploration and market enlargement . Additionally, with the advanced testing equipments, consummate after -sell service, it has been awarded as advanced departm e nt and excellent enterprise by government for many years."ChangKai" products are obtain the highly praise form various, some of them are exported to Korea , Russia , Albania , Vietnam , B urma, etc. The company will insist on the management idea of "Creative sprit, unceasing struggle, seek for outstand, regard talents”, redound upon the clients with good products and considerate service.

  used circuit breakers

 Technical 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
Powerfrequency 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 with stand 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	≤150×10-6
Mechanical life		times	10000
Electrical level of radio interference		μ V	≤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 changed by modified coefficient. Every 2000m of altitude, K=1.13;altitude3000m, K=1.28

mian technical 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
Eenergy 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 of 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 switch		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	25+20
Length of the inter phaseoperating 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
Switch-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

Product display:

SF6 Circuit Breaker,used circuit breakers