Product intruduction
LW36-72.5 self energy outdoor HV AC SF6 circuit breaker is an outdoor three phase porcelain column electrical equipment mainly used in AC 50Hz or 60Hz, 72.5kV electricity systems in extremely cold regions (for electric stations in general regions and extremly cold regions). This product can be operated frequently and used as connection circuit breaker.
Product performance
1. High performance- strong rated circuilating ability: strong short-circuit breaking alibility at 3150A, 40kA
2. Long service life-electrical endurance: 31.5kAx21 times; mechanical life: 6000 times without maintenance and upto 10000 after simple adjustment
3. High reliability- sharing the arc extinguishing compartment structure with LW36-126; great product internal insulation redundancy; over-all cast aluminum alloy frame adopted for the spring structure; simple structure and high reliability; suitable for frequent operations.
4. Reliable breaking performance
5. Reliable sealing performance; annual leakage of SF6 gas <0.5%
6.Meeting the requirements of hard running environments-suitable for class IV polluted places and -40oC~+40oC environments
7. Multi-structure froms-usually porcelain column type and hancart type
.
Main technical parameter

Serial No.	Name	Unit	Value
1	Rated voltage		72.5
2	Rated power frequency withstand voltage (1min)
2.1	To earth	kV	160
2.2	Across open contact	kV	160+42
3	Rated lightning impulse withstand voltage
3.1	To earth	kV	380
3.2	Across open contact	kV	380+59
4	Rated frequency	Hz	50/60
5	Rated curent	A	3150
6	Rated short-circuit breakering current (Isc)	kA	40
7	Rated short-circuit making current (peak)	kA	100/104
8	Rated hsort-time withstand current	kA	40
9	Rated peak withstand current	kA	100/104
10	Rated duration of short-circuit	s	4
11	Rated out of phase breaking current	kA	10
12	Short-line fault breaking current	kA	90%Isc,75%Isc
13	Double earth fault breaking current	kA	34.8
14	Rated operating sequence		o-0.3s-CO-180s-CO
15	Number of rated short-circuit breaking current	times	20
16	First pole to clear factor		1.5
17	Rated line charging breaking current	A	10
18	Rated SF6 gas pressure (20oC gauge pressure)	Mpa	0.4
19	Gas refilling alarm pressure	Mpa	0.36
20	Operation locakout pressure	Mpa	0.32
21	Annual leakage of SF6 gas	%	≤0.5
22	Gas humidity content (L/L) (20oC at handover)	L/L	≤150x10-6
23	Mechanical endurance	Times	6000
24	Opening time	ms	≤30
25	Closing -opening time	ms	≥70
26	Creepage distance	mm	≥2585
27	Weight of SF6 gas filled for each CB	kg	6/8
28	Weight of one set of CB	kg	1300