24KV SF6 Ring Main Unit
The 24kv sf6 ring main unit is insulated by SF6 gas, and the voltage transformer cabinet and the transformer cabinet can be insulated by air. The vacuum circuit breaker or SF6 circuit breaker can be used in the cabinet circuit breaker, and the three-station SF6 load switch should be used in the load switch, which should be consistent with the type test report.
The electrical life of load switch should reach the E3 level, and that of the circuit breaker should reach the E2 level. A kind of the relative pressure of SF6 in the airbag of 2.1.2 ring net cabinet should not exceed 1.4 bar. Robot laser welding process should be selected to ensure the sealing performance of the airbag. The protection level of the airbag is IP67.
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Ring main unit should have the perfect five-proof interlocking function.
| Ring6 24KV | C-module | F-module | v-module | ||||
| Switch disconnector | Earthing switch | Switch-fuse disconnector | Downstream earthing switch | Vacuum circuit-breaker | Earthing switch/ disconnector | ||
| Rated voltage | kV | 12/17, 5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 |
| Rated frequency 5) | Hz | 50/50/50 | 50/50/50 | 50/50/50 | 50/5 0/50 | 50/50/50 | 50/50/50 |
| Power frequency withstand voltage | kV | 284)/38/50 | 284)/38 /50 | 284,/38 /50 | 284,/38 /50 | 284)/38/50 | 284)/38/50 |
| Lightning impulse withstand voitage | kV | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 |
| Rated normai current | A | 6 30/630/630 | 2001) | 200/200/200 | |||
| Breaking capacities: | |||||||
| -active load | A | 630/630/630 | |||||
| -closed loop | A | 650/650/650 | |||||
| -offload cable charging | A | 140/140/140 | |||||
| -offload transformer | A | 20/20/20 | |||||
| -earth-fault | A | 205/160/160 | |||||
| -earth-fault cable charging | A | 117/91/91 | |||||
| -short-circuit breaking current | kA | see2) | 16/16/16 | ||||
| Marking capacity | kA | 52,5/40/40 | 52,5/40/40 | see2) 5 | 12,5/12,5/12, | 40/40/40 | 40/40/40 |
| Short tirne current 3 sec,3) | kA | 21/16/16 | 21/16/16 | 16/16/16 | 16/16/16 | ||
1) Depending on the current rating of the fuse-link 2) Limited by high voltage fuse-links 3) Maximum rating for bushings Interface C (400 series bolted) 4) GOST version is available with 42kV power frequency to withstand voltage 5) For rated frequency 60Hz de-rating for current parameter needs to be applied
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