- Contact Person : Ms. Wang Grace
- Company Name : Beijing Huadong Electric Co., Ltd.
- Tel : 0086-10-67668022
- Fax : 0086-10-87697121
- Address : Beijing,Beijing,Room 408, B unit, No.1 building, No.16, Ronghua South Road, Beijing Economy technologyl developed area,Beijing.
- Country/Region : China
72.5KV/126/145KV SF6 Circuit breaker(Type: LW49)
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General
1.1 This specification is applicable for LW49-145 outdoor HV AC Auto Expansion SF6 Circuit Breaker, stating the contents of installation, operation and maintenance of circuit breaker, including the safe criterion and risks during the course. Any operator should read this specification carefully before install and operate circuit breaker. He can operate it when being familiar with the related contents. Please contact the manufacturer if you need any question or detailed documents.
Main technical parameters
No. | Item | Unit | Parameter | |
1 | Rated voltage |
kV | 126/145 | |
2 | Rated power-frequency withstand voltage(1min) | Over ground | 275 | |
Between fractures | 315 | |||
Rated lightning impulse withstand voltage | Over ground | 650 | ||
Between fractures | 750 | |||
4 | Rated frequency | Hz | 50 | |
5 | Rated current | A | 1250,1600,2000,2500,3150 | |
6 | First-pole -to-clear coefficient |
| 1.5 | |
7 | Rated short-circuit breaking current |
kA | 40 | |
8 | Rated short-circuit makeup current (peak) | 100 | ||
9 | Rated short-time withstand current | 40 | ||
10 | Rated peak withstand current(peak) | 100 | ||
11 | Rated short-circuit duration | s | 4 | |
12 | Rated out of step breaking current | kA | 10 | |
13 | Nearby area failure breaking current | kA | 36, 30 | |
14 | Rated line charge breaking current | A | 31.5 | |
15 | Rated operation sequence |
| O-0.3s-CO-180s-CO | |
16 | Break-brake time | ms | 33±5 | |
17 | Close-brake time | 80±10 | ||
18 | Close and break time | ms | ≤60 | |
19 | Main circuit resistance(between primary outgoing upper and lower) | μΩ | ≤40 | |
20 | Gas rated pressure of SF6 (20°C gauge pressure) | MPa | 0.6 | |
21 | Alarm / closedown pressure(20°Cgauge pressure) | 0.55 / 0.50 | ||
22 | Leak rate of SF6 per year | %-Y | ≤ 0.5 | |
23 | Moisture content of gas | ppm(v/v) | ≤150 | |
24 | Mechanical life | Times | 6000 | |
25 | Wireless disturbing level | μV | ≤500 | |
26 | Mass of charging SF6 gas | kg | 10 | |
27 | Mass of circuit breaker | 1800 | ||
72.5KV/126/145KV SF6 Circuit breaker(Type: LW49)
