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HXGN-12 Combined Ring Main Unit
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Detail
Ring network refers to a circular distribution network, where the power supply main lines form a closed ring, and the power supply sources supply power to this ring main line. From the main line, power is distributed to the outside through high-voltage switches. The advantage of this is that each distribution branch can draw power from both its left and right main lines. When the left main line fails, it continues to receive power from the right main line, and when the right main line fails, it continues to receive power from the left main line. In this way, although the main power supply is single path power supply, each distribution branch receives a benefit similar to dual path power supply, thereby improving the reliability of power supply.
| Rated voltage/Maximum operating voltage | 10/12kV | |
| Rated current | 630A | |
| Main bus current | Entry cabinet | 630A |
| Exit cabinet | 125A | |
| Rated short-time withstand current | 20kA | |
| Rated short-circuit duration | 4S | |
| Rated peak withstand current | 50KA | |
| Rated short-circuit closing current | (50)80kA | |
| Rated active load breaking current | 630A | |
| Closed-loop breaking current | 630A | |
| Rated cable charging current | 20kA | |
| Rated short-circuit withstand current of grounding switch | 20kA | |
| Rated short-circuit duration of grounding switch | (4)2S | |
| Rated peak withstand current of grounding switch | 50kA | |
| Rated short-circuit closing current of grounding switch | 50kA | |
| Lmin rated power frequency withstand voltage | Phase-to-phase,earth-to-ground,vacuum | 42kV |
| load switch interrupting gap | 48kV | |
| Ratedlightning impulse withstand voltage | Phase-to-phase,earth-to-ground,vacuum | 75kV |
| load switch interrupting gap | 85kV | |
| Mechanical life | Vacuum load switch | 10000times |
| Grounding switch(blade) Isolating switch(blade) | 2000times | |
| Junction current | 3150A | |
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