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Application and characteristics
- The JinKwang Ring Main Unit with circuit breaker is for the secondary distribution network. It can be supplied in a number of different type according to the combination of switch and circuit breaker.
- The Ring Main Unit with circuit breaker is supplied with the following standard equipment.
- Earth switch for worker safety during line work.
- Mechanical interlocking between main switch and earth switch.
- Operating handle
- Lifting lug for easy handling
- Gas pressure gauge
- Live-line indicating lamps to check whether the line is energized or not.
- Reserved RTU space.
- LCD for monitoring the operational data of the control.
- Status monitoring (open/close, local/remote, gas pressure low,
- door open, loss of external power, lock/unlock)
- Measuring for CB circuit ((currents (A/B/C/N), voltages (A/B/C), phase angle, power (active, reactive, apparent power factor)).
- Control (open/close, local/remote, lock/unlock, battery test).
- Protection for CB circuit (reclosing (1time), 51P, 51G).
Rating
| Type |
JK - RMUCB |
| Rated voltage (kV) |
15 |
| Rated current (A) |
|
| Rated lightning impulse withstand voltage(kV) |
75 |
| Rated power frequency withstand voltage(kV) |
60 |
| Rated DC withstand voltage(kV) |
78 |
| Rated short-time current (kA, RMS) |
12.5 |
| Rated interrupting current(A/RMS) |
12,500(Circuit breaker) |
| Mechanical endurance(times) |
2,000(Main S/W) / 1,000(Earth S/W) |
| Applied standard |
| IEC 60265-1/ ANSI C37.60 / ANSI C37.71 |
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