LW--72.5/T3150-31.5

The type LW-72.5/T3150-31.5 outdoor high voltage SF6 circuit breaker is equipment with CBT-I spring operating mechanism for 3-

The circuit breaker take on self-energized arc control system , which has the features of simple construction, small volume, small needed operation power, good stability, easy installation, low operation noise and so on. It is the new type high voltage SF6 circuit breaker manufactured by our company.

2.Main Features

Type LW--72.5SF circuit breaker take on self-energized arc control device, which applies the blockage effect of the arc more effectively, reasonable pressure ratio and speed characteristic, reduces the diameter of the air cylinder, lighten the weight of arc device, so that make thus the operation power of the mechanism decline apparently.

The 3 stage circuit breaker installate on the same crossbeam, the three pole gang operation adopt duplex pull rod construction, which make the pull rod only bear the pull force and the stress is more even, and the simultaneity between phases is good, is the advantage construction among switchgear equipments. The arm and drive shat are connected by involute spline, which make the moment of force bigger.

CTB-1 spring operation mechanism has strong operation force, so it could afford reasonable opening and closing speed, and the envelope of the mechanism is make of corrosion resistant steel which has the features of firm, aesthetic and high protect level.

3.Main Technical data

 

Number	Item		Unit	Data		Importance level
1	Rated voltage		KV	72.5
2	Rated insulation level		KV	Fig.2
3	Rated frequency		Hz	50
4	Rated current		A	3150
5	Rated short circuit breaking current		KA	31.5
6	Rated short time withstand current		KA	31.5
7	Rated peak withstand current		KA	80
8	Rated duration of short circuit		S	4
9	Rated short circuit making current(peak)		KA	80
10	Rated short line fault breaking current		KA	L90:22.5	L90:28.35
				L75:18.75	L75:23.63
11	Rated line charging breaking current		A	10
12	Rated out of phase breaking current		KA	7.9
13	First-pole-to-clear factor			1.5
14	SF6 gas pressure(20°)		MPa	Fig,3
15	Mechanical characteristic			Fig,4
16	Rated operating sequence			O-0.3s-CO-180-CO
17	Operation mechanism main technical data			Fig.5
18	Main loop resistance			≤50		[A]
19	Permissible load on wiring terminal	Horizontal	N	750
		transverse	N	500
		vertical	N	750
20	Mechanical duration		times	10000		[B]
21	SF6 gas leakage per year			≤0.5%		[A]
22	SF6 gas vapor content(V/V)		PPm	≤150		[B]
23	3-pole circuit breaker total weight(include mechanism)		Kg	1000
24	SF6 gas weight		Kg	4
25	External dimensions		mm	2800×440×4296

LW--72.5/T3150-31.5