LW3-12 I.II SF6 HV Outdoor Circuit Breaker
LW3-12 I.II SF6 HV outdoor circuit breaker is a new type product that SF6 is taken for insulating and arc extinguishing. The arc-chute consists of a breaker and an operative mechanism, using rotating arc principle. Compared with the 10KV series outdoor breakers, this kind of product has obvious advantages, such as a simple structure, the higher reliability of insulating and arc extinguishing, a lower operative power, and a higher rated parameter, a longer electrical service life, a long maintenance free duration, and so on.
This kind of product can be divided into two types:Type I and Type II. The main difference is that, type I is fitted with a kind of manual energy -storage mechanism operated by spring, mainly used on the pillar, and type II is equipped with motor-driven energy -storage mechanism operated by spring which not only can be operated by hand directly or be controlled remote, but also can do coincide automatically, mainly used in the mini-medium substation for protecting and controlling.
Type designation :
Technical parameter of this High Voltage outdoor circuit breaker :
|
NO
|
Name
|
Unit
|
Data
|
|
1
|
Rated voltage
|
KV
|
12
|
|
2
|
Rated insulating level(the pressure of SF6 in the breaker is 0.25Mpa, the temperature is 20 )
|
Lightning impulse withstand voltage
(full wave)
|
KV
|
75
|
|
Rated 1min power frequency withstand voltage
|
42
|
|
The voltage withstand test under the condition of raining
|
34
|
|
3
|
The insulating level under zero pressure
(the pressure on the highest phase is 5min)
|
KV
|
9
|
|
4
|
Rated current
|
A
|
400 630
|
|
5
|
Rated short-circuit breaking current
|
KA
|
6.3 8 12.5
|
|
6
|
The breaking current under zero pressure of t
|
A
|
400 630
|
|
7
|
Rated short-circuit breaking times
|
Times
|
20
|
|
8
|
Rated operative sequence
|
Type I
|
|
Off-180s-on/off-
180s- on/off
|
|
Type II
|
Off -0.5s- on/off -
180s- on/off
|
|
9
|
Rated short-circuit breaking current
(peak value)
|
KA
|
16 20 31.5
|
|
10
|
Rated peak withstand current
(peak value)
|
KA
|
16 20 31.5
|
|
11
|
Rated short-time withstand time
|
S
|
4
|
|
12
|
Rated short-time withstand current
|
KA
|
6.3 8 12.5
|
|
13
|
Rated operating pressure
|
M Pa
|
0.35
|
|
14
|
The lowest operating pressure
|
M Pa
|
0.25
|
|
15
|
Annual leak rate
|
&
|
<=1
|
|
16
|
Mechanical Endurance
|
Times
|
2000
|
|
17
|
Weight
|
Type I
|
Kg
|
122
|
|
Type II
|
130
|
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