1 Overview
1.1 LW8-35AG outdoor Goller SF6 circuit breaker is a three-phase AC 50Hz outdoor high-voltage electrical equipment. It is suitable for the control and protection of 40.5KV power transmission and distribution systems. It can also be used for contact circuit breakers and switching capacitor banks.
1.2LW8-35AG outdoor high-voltage SF6 circuit breaker is equipped with a CT10-A electric spring operating mechanism. An outdoor current transformer can be attached externally or internally. Feed-through bushing-type current transformer.
1.3 The circuit breaker complies with the requirements of the national standard GB1984-2003 “AC High-voltage Circuit Breaker” and the International Electrotechnical Commission standard IEC62271-100 publication “High-voltage AC Circuit Breaker.”.
Below are the main features of circuit breakers.4
a. Excellent breaking performance, short arcing time and long electrical life.
b. The insulation is reliable and can withstand 40.5kV for 10 minutes under zero gauge pressure.
c. The mechanism has small operating power, high reliability and can be operated frequently.
d. The structure is simple and compact, the volume is small, and the maintenance cycle is long.
Operating environment conditions 6
a. Altitude: no more than 2,000 meters;
b. Ambient temperature: -30℃~+40℃ (special requirements -40℃~+40℃);
c. Relative humidity: daily average not greater than 95%, monthly average not greater than 90% (25℃); d. Wind speed: not greater than 35 meters/second:
e. Pollution level: Level IV, nominal creepage distance 31mm/kV;
f. There are no flammable substances, explosion hazards, chemical corrosion and severe vibration situations.
2 Main technical parameters：
| Number | Name | Unit | Data | |
|---|---|---|---|---|
| 1 | Rated Voltage | kV | 40.5 | |
| 2 | Rated Current | A | 1600/2000/2500 | |
| 3 | Rated Short-circuit Breaking Current | kA | 31.5 | |
| 4 | Rated Short-circuit Making Current (Peak) | kA | 80 | |
| 5 | Rated Short-circuit Withstand Current (Thermal Stable Current) | kA | 31.5 | |
| 6 | Rated Short-circuit Duration (Thermal Stable Time) | S | 4 | |
| 7 | Rated Peak Withstand Current (Dynamic Stable Current) | kA | 80 | |
| 8 | Rated Out-of-step Breaking Current | kA | 8 | |
| 9 | Full Load Breaking Operations | Times | 20 | |
| 10 | Rated Insulation Level | 1min Power Frequency Withstand Voltage | kV | kV 95/118(Break) Lightning Impulse Withstand Voltage (Full Wave Peak)185/215(Break) |
| Lightning Impulse Withstand Voltage (Full Wave Peak) | kV | 185/215(Break) | ||
| 11 | Closing Time | ms | ≤120 | |
| 12 | Opening Time | ms | <60 | |
| 13 | Rated Operating Sequence | 0-0.3s-C0-180s-CO | ||
| 14 | Mechanical Life | Times | 6000 | |
| 15 | Annual Gas Leakage Rate | <0.3% | ||
| 16 | Circuit Breaker Total Weight | kg | 800(With CT 1200) | |
| Number | Name | Unit | Data |
|---|---|---|---|
| 1 | Rated Pressure (20℃) | MPa | 0.5 |
| 2 | Low Pressure Alarm Pressure (20℃) | MPa | 0.42 |
| 3 | Low Pressure Interlock Pressure (20℃) | MPa | 0.4 |
| 4 | SF6 Gas Weight | Kg | 2.0(5.0 with internal CT) |
| 5 | SF6 Gas Moisture Content | μ L/L | ≤150 |
