Product overview
LW30-72.5 porcelain column high-voltage AC sulfur hexafluoride circuit breaker is equipped with CT20 spring operating mechanism, which adopts the principle of self-energy arc extinguishing and has a single-break structure. The three poles of each circuit breaker are mounted on a frame to realize three-phase mechanical linkage through the transmission mechanism.
Performance indicators
1)Excellent breaking performance
2)Long electrical life.
3)Reliable insulation performance
4)Long mechanical life
5)Safe and reliable operation and small maintenance workload.
Main technical parameters
★The rated voltage is 72.5KV；;
★Rated current 3150A；;
★Rated short-circuit breaking current is 31.5KA；;
★The rated short-circuit closing current (peak value) is 80KA；;
★The rated short-term withstand current is 31.5KA；;
★The rated short-circuit duration is 4 s; Rated peak withstand current (peak value) 80KA；;
★Rated insulation level, 1min power frequency withstand voltage (effective value) (0.4 MPa SF6 gas at 20℃), 160+42 kV between fractures, and 160＋42KV to ground (same as dry test and wet test); Lightning impulse withstand voltage (peak value) is 1.2/50μ s (0.4mpa SF6 gas at 20℃), 350+60kV between fractures and 350KV to ground.
★Zero gauge pressure 5min power frequency withstand voltage (effective value) 84KV
★Opening time ≤ 0.03s.
★Breaking time ≤0.06s
★Closing time ≤0.15s
★Opening-closing time ≥ 0.3s.
★On-off time 0.06s
★The rated pressure of SF6 gas (20℃) in the circuit breaker is 0.50MPa, the alarm pressure is 0.45MPa, the locking pressure is 0.40MPa, the water content is ≤150PPM (V/V), and the annual air leakage rate is ≤ 1%.
Structure introduction
The product has two layout forms, indoor and outdoor, and each layout form can be divided into circuit breaker interval and monitoring interval. Each interval consists of two parts: a fixed part and a movable part. Fixed part
It includes isolating plug, grounding switch and local operation control cabinet. The movable part is an electrical module which can move as a whole by assembling different electrical components with a trolley as the base. The movable part of the circuit breaker interval is composed of self-energy SF6 circuit breaker, current transformer and isolating plug. The movable part of the measurement and protection interval is composed of voltage transformer, lightning arrester and isolation plug.
Main features
The circuit breaker is a new generation of self-energy SF6 circuit breaker with spring operating mechanism.
The structural forms of the circuit breaker interval and the measurement and protection interval are consistent.
The trolley and grounding switch are equipped with electric operating mechanisms, and all of them, including the circuit breaker, can be operated in the local operation control cabinet.
The secondary wiring from the local operation control cabinet to each component is plug-in, and an intelligent control cabinet can be provided to realize unattended operation.
The primary connection mode is flexible, which does not affect the continuous power consumption of users during maintenance.
The overall layout is simple and beautiful, which can be applied to both indoor and outdoor.
Main technical parameters
1 rated voltage kV 66
2 Rated current A 1250 3150
3 rated short-circuit breaking current kA 31.5
4 rated short-term withstand current kA 31.5(4s)
5 rated peak withstand current kA 80
6 Rated lightning impulse withstand voltage kV fracture 350+60 to ground 350
Overall dimensions
