CN
The GTXGN□‑12 solid‑insulated ring main unit is fully‑insulated and fully‑sealed indoor high‑voltage distribution equipment for 3.6‑12 kV three‑phase AC systems. Its main conductive circuit is integrally cast with epoxy resin and other solid insulating media. It features full shielding, modular design, high protection class and environmental‑friendly performance without SF₆ gas. Compact in structure, it can integrate spring‑operated or permanent‑magnet vacuum circuit‑breakers and supports remote monitoring. Suitable for harsh environments such as high altitude and heavy pollution, it is widely used in urban power grids, industrial‑mining enterprises and rail transit for reliable ring‑network power supply and intelligent power distribution. This product complies with GB/T 62271‑200, GB/T 3096, GB/T 1984.
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Product Parameters |
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Rated voltage |
kV |
12 |
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Frequency |
Hz |
50 |
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Rated current |
A |
630 |
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Rated short‑time withstand current |
kA/4s |
25 |
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Rated peak withstand current (peak value) |
kA |
50 |
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Rated short‑circuit making current (peak value) |
kA |
50 |
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Rated active load breaking current |
A |
630 |
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Rated ring‑network breaking current |
A |
630 |
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Rated cable‑charging breaking current |
A |
10 |
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Power‑frequency withstand voltage (1 min) |
Across phases‑to‑earth vacuum gap |
kV |
42 |
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Isolating breaking gap |
kV |
48 |
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Lightning impulse withstand voltage (peak) |
Across phases‑to‑earth vacuum gap |
kV |
75 |
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Isolating breaking gap |
kV |
85 |
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Mechanical endurance |
Circuit‑breaker |
times |
10000 |
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Disconnector & earthing switch |
times |
3000 |
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Degree of protection |
IP |
IP4X |
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Enclosure protection class |
IP |
IP4X |
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Partial discharge (1.2Ur) |
pC |
≤20 |
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