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|Rated Voltage:||40.5||1min Power Frequency Withstand:||185/215(fracture)|
|Lightning Impulse Withstand:||95/118(fracture)||Rated Current:||2000|
Outdoor SF6 High Voltage Circuit Breaker AC 50Hz LW8-40.5
1.1 LW8-40.5 Outdoor HV SF6 circuit breaker is an outdoor HV electrical equipment of three-phase, AC, 50Hz and it's suitable for control and protection of power transmission and distribution system, it also can be used to tie circuit breaker and break/make capacitor bank, and also can attach circuit breaker in it for measurement and protection.
1.2 LW8-40.5 Outdoor HV SF6 circuit breaker adopts CT14 spring operation mechanism.
1.3 The circuit breaker meets the requirements of national standard : GB1984-89 AC High-Voltage Circuit breakers, and IEC56 AC High-Voltage Circuit breakers.
1.4 Main features of the Circuit breaker
a. Good breaking performance, short-time arcing time,
long electrical duration and with the ability of continuous breaking of 16 times under the rated voltage without change of SF6.
b. Reliable insulation, to be up to 40.5Kv/10min at gas pressure of zero point of meter.
c. High mechanical reliability, High making ability, frequent operation is available.
d. Without return while closing and opening capacitor bank of 400A.
e. Cut off long line of 25.50km and has no re-burn.
f. Simple structure, small size, long free time is no need to overhaul.
1.5. 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.
2. Main technical parameters
2.1 LW8-40.5 Circuit breaker main technical parameters to see table 1.
2.2 Assembly and adjustment parameters of circuit breaker to see table 2.
|2||Rated insulation level||1min power frequency withstand voltage||kV||185/215(fracture)|
|Lightning impulse withstand voltage||95/118(fracture)|
|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|
|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
|22||Weight of SF6 gas||kg||8|
|23||Weight of circuit breaker (including operation mechanism)||kg||1400|
|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|
|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|