The LW36-72.5 porcelain post-type high-voltage AC SF6 circuit breaker is equipped with a CT20 spring operating mechanism. It adopts the self-energy arc extinction principle and features a single-break structure. The three poles of each circuit breaker are mounted on a single frame and are mechanically interconnected through a drive mechanism. The electrical control allows for both remote and local operation.
Parameter Name Unit LW36-72.5 LW25-126/145 LW25-252 LW15B-252
LW15-252Rated voltage kV 66 126 / 145 252 252 Rated frequency Hz 50 50 50 50 Rated current A 1250, 3150, 4000 2000, 3150 4000 3150, 4000 Rated breaking current kA 25, 31.5 40 / 31.5 40 50 Rated closing current (peak) kA 80 100 / 80 100 125 Rated short-time withstand current (4s) kA 31.5 40 / 31.5 40 50 Rated peak withstand current kA 80 100 / 80 100 125 Near fault breaking current kA 90% lk,
75% lk– – – Rated out-of-step breaking current kA 25% lk – – – Creepage distance cm/kV 3.1 2.5, 3.1 – – 1-min power frequency withstand voltage (dry test) – To ground kV 160 275 460 460 – Inter-pole kV 160 275 – – – Fracture kV 160 + 42 275 395 + 145 395 + 145 1-min power frequency withstand voltage (wet test) – To ground kV 160 275 460 460 – Inter-pole kV 160 275 – – – Fracture kV 410 650 / 750 950 + 206 950 + 206 Rated lightning impulse withstand voltage – To ground kV 350 550 / 650 1050 1050 – Inter-pole kV 350 550 / 650 – – 5-min zero-pressure withstand voltage kV 84 95 / 124 189 189 Closing time ms ≤150 ≤150 ≤110 ≤100 Opening time ms ≤30 ≤30 (reclosing ≤35) ≤30 ≤25 Breaking time ms ≤60 ≤60 ≤60 ≤60 Closing-Opening time ms 40-60 40-60 50-70 40-60 Phase asynchronism time ms ≤2 (open), ≤4 (close) ≤2 (open), ≤4 (close) ≤2 (open) ≤2 (open) Rated reclosing sequence – O—0.3s—CO—180s—CO O—0.3s—CO—180s—CO – – SF6 gas rated pressure MPa 0.5 / 0.4 0.5 0.6 0.6 SF6 gas alarm/lock pressure MPa 0.45/0.40, 0.35/0.30 0.45/0.40 0.55/0.50 0.55/0.50 SF6 gas annual leakage rate %/Year ≤0.5 ≤0.5 ≤0.5 ≤0.5 Number of fractures per pole – 1 1 1 1 Mechanical life Times 3000 3000 3000 3000 Terminal mechanical strength – Horizontal longitudinal tension N 790 1250 1500 1500 – Horizontal lateral tension N 750 750 1000 1000 – Vertical tension N 750 1000 1250 1250 Main circuit resistance μΩ ≤50 ≤45 ≤45 ≤42 Matching mechanism – Spring Spring Spring/
HydraulicHydraulic/
PneumaticSF6 gas weight per unit kg 4 6 30 30 Circuit breaker weight kg 1000 1400 3500 4000 / 4500 Standards compliance – GB/T 1984, IEC 60056 GB/T 1984, IEC 60056 GB/T 1984 GB/T 1984
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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