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[China]
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Address: 3/F, Building B7 , 999 Yangfan Road,High-tech Zone, Ningbo, China 315040
Contact name:Lian Huanhuan
Ningbo Tianan (Group) Co.,Ltd. |
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40.5KV Outdoor Frame - Type SF6 Circuit Breaker / High-Speed Air Circuit Breaker
Overview
LW8-40.5 Type Outdoor AC HV SF6 Circuit Breaker is a kind of outdoor HV electrical equipment, three-phase, AC 50Hz. it is used not only for control and protection for 35kV power transmission and distribution system, but also for connecting circuit breaker and opening and closing capacitor bank, as well as for measurement and protection when it is equipped with current transformer.
This circuit breaker is equipped with CT14 type spring operating mechanism. And it is conformed to the requirements of the standard of GB1984-89 and IEC56 .
Application environment
a. Altitude to be not more than 1000m.
b. Ambient temperature: -30ºC - + 40ºC, the average value of 24H to
be not more than 35ºC;
c. Relative humidity: the daily average value to be not more than
95%, monthly average value to be not more than 90%,
d. Speed of wind: not more than 35km/s
e. Contamination condition to be III grade, porcelain bushing
creepage distance shall be 1050 mm (nominal creepage ratio to be
not less than 25mm/kV);
f. The ambient air should be free of the flammable material,
explosive danger, chemical corrosive and intensive shake.
Table 1
| No. | Item | Unit | Parameter | |
| 1 | Rated voltage | kV | 40.5 | |
| 2 | Rated insulation level | 1min power frequency withstand voltage | kV | 185/215(fracture) |
| Lightning impulse withstand voltage | 95/118(fracture) | |||
| 3 | Rated current | A | 2000 | |
| 4 | Mechanical endurance | time | 5000 | |
| 5 | Rated pressure of SF6 gas(20ºC meter pressure) | Mpa | 0.45 | |
| 6 | Locking pressure (20ºC meter pressure) | Mpa | 0.40 | |
| 7 | Lowest ambient temperature | ºC | -30 | |
| 8 | Rated short-circuit breaking current | kA | 31.5 | |
| 9 | Rated short-circuit making current(peak) | kA | 80 | |
| 10 | Rated short time withstand current(thermal current) | kA | 31.5 | |
| 11 | Rated peak withstand current(dynamic current) | kA | 80 | |
| 12 | Rated out-of-phase breaking current | kA | 7.9 | |
| 13 | Breaking times of the rated short-circuit breaking current: | time | 16 | |
| 14 | Close time | s | ≤0.1 | |
| 15 | Open time | s | ≤0.06 | |
| 16 | Rated operation sequence | O-0.3s-CO-180s-CO | ||
| 17 | Rated breaking/opening current of single capacitor group | A | 400 | |
| 18 | Last time of short circuit current | s | 4 | |
| 19 | SF6 leakage rate (yearly) | ≤1 | ||
| 20 | Moisture Content of SF6 gas(20ºC) | Ppm(v/v) | ≤150 | |
| 21 | Rated operating voltage of spring operation mechanism | |||
| Voltage of closing and opening coil | V | AC 220, 380 DC:48, 110 , 220 | ||
| Voltage of energy storage motor | V | AC 220 DC 220 | ||
| 22 | Weight of SF6 gas | kg | 8 | |
| 23 | Weight of circuit breaker (including operation mechanism) | kg | 1400 | |
Table 2
| No. | Item | Unit | Technical Requirements | Test conditions and methods |
| 1 | Travel of movable contact | mm | 95±2 | Measurement of movable contact travel refer to darawing12 |
| 2 | Clearance between contacts | mm | 605±1.5 | Measurement of Clearance between movable and fixed contact refer to drawing 12a |
| 3 | Three-phase switch-on asynchrony | ms | ≤3 | Measurement of pole distance difference between movable and fixed contact refer to darawing14 |
| 4 | Three-phase switch-off asynchrony | ms | ≤2 | Measurement of pole distance difference between movable and fixed contact refer to drawing 15 |
| 5 | Resistance of main loop | μΩ | ≤120 | Measurement to DC voltage drop method, put in 100A |
| 6 | Speed at instant of contacts touching | m/s | 3.2±0.2 | Rated voltage and measurement method refer to drawing 14 |
| 7 | Speed at instant of contacts disconnecting | m/s | 3.4±0.2 | Rated voltage and measurement method refer to the drawing 15 |
| 8 | Cuisine stroke of making | mm | 10+0.5 -0.1 | Refer to drawing 6 under the closing status |
| 9 | positioning gap of Cuisine stroke of making | mm | 1-2 | Refer to drawing 6 under the closing status |
| 10 | Partial charging 40.5kV 25.7kV | PC | 20 | At rated gas pressure, use partial instrument to put 40.5kV between two outgoing wires for 1min, then drop to 25.7kV equably |
| PC | 10 |
