Category
35kV MV Outdoor SF6 Circuit Breaker, LW8-40.5/2000-40
1. General description
a. The circuit breaker is outdoor small ceramic column structure, which equipped with CT14 spring operation mechanism; mechanism and main part connected with simple installation. It has features of convenient adjustment, reliable operation, suitable for frequent operation; mechanism service life more than 3000 times;
b. Adopt air-compression arc-extinguishing structure, with strong breaking capacity, 40kA total breaking times up to 12, which is the highest in China;
c. Reliable sealing performance. Adopt import seal; dynamic seal adopts"V"type sealing ring with spring pressure compensation structure; the transformer secondary wiring board matched by cooperative enterprises, to ensure the annual leakage rate less than 1 %;
d. Inner current transformer adopts micro crystallizing alloy high magnetic materials, with accurate class up to grade 0.2 or grade 0.2S. According to users' needs, it can be matched with 12 transformers, to meet the load line of 50 km without restrike.
2. Main technical parameter
Item | Unit | Data | Technical parameter |
Rated voltage | kV | 40.5 | |
Rated insulation level lightning impulse withstand voltage(peak) | kV | 185 | |
Rated insulation level 1 min P.F. withstand voltage | kV | 95 | |
Rated current | A | 2000 | |
Mechanical life time | time | 3000 | |
Rated air pressure of SF6(psig at 20℃) | Mpa | 0.05 | |
Alarm pressure/Min.function pressure (psig at 20℃) | Mpa | 0.47/0.45 | |
Rated short-circuit breaking current | kA | 40 | |
Rated short circuit making current(peak value) | kA | 100 | |
Rated short-time withstand current(thermal stability current) | kA | 40 | |
Rated peak withstand current(dynamic stability current) | kA | 100 | |
Rated out of step breaking current | kA | 10 | |
Rated breaking times under short circuit breaking current | time | 12 | |
Rated short circuit duration | S | 4 | |
Closing time(under rated operation voltage) | S | ≤0.1 | |
Opening time(under rated operation voltage) | S | ≤0.06 | |
Rated operating sequence | O-0.3s-CO-180s-CO | ||
Rated making single capacitor bank current | A | 400 | |
Annual leakage rate | % | ≤1 | |
SF6 water content(V/V) | ≤150×10-6 | ||
Rated operation voltage of matched CT14 spring operation mechanism | |||
Closing and opening coil voltage | V | AC:220 380 DC:48 110 220 | |
Energy storage motor voltage | V | AC:220 380 DC:110 220 | |
Weight of SF6 gas | kg | 8 | |
Weight of circuit breaker(including operation mechanism) | kg | 1400 | |
Moving contact travel | mm | 95±2 | Measure moving contact travel |
Opening distance between contacts | mm | 60±1.5 | Measure distance between moving and fixed contact |
Pole-to-pole closing synchronous | ms | ≤3 | Measure pole distance difference between moving and fixed contact |
Pole-to-pole opening synchronous | ms | ≤2 | Measure pole distance difference between moving and fixed contact |
Main circuit resistance | mΩ | ≤120 | Measure DC voltage reduction |
Closing speed | m/s | 3.2±0.2 | Rated air pressure, measuring method |
Opening speed | m/s | 3.4±0.2 | Rated air pressure, measuring method |
Closing buffer distance | mm | 10+0.5(-1.0) | Under closing state |
Spacer of closing buffer | mm | 1-2 | Under closing state |
Partial 48.6kV | Pc | 20 | Measure by partial measuring device under rated air pressure; apply voltage 48.6kV on the two out-line ends of the circuit breaker for 1 min, then reduce the voltage to 28kV to measure |
Discharge 28kV | Pc | 10 |
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