ZHEJIANG XINKOU POWER EQUIPMENT CO.,LTD
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| ltem | Unit | Data | |
| Rated voltage | KV | FN12-12D/630 | FN12-12(R)D/125 |
| Rated frequency | HZ | 12 | |
| Rated current | A | 50 | |
| 1min power frequency withstand voltage | KV | 42 to ground and phases fracture 48 | |
| Lightning impulse withstand voltage | KV | 75 to ground and phases fracture 85 | |
| Rated thermal stable current | KA | 630 | 100 |
| Rated dynamic stable current | KA | 50 | |
| Rated switching current(peak) | KA | 50 | 50 |
| Rated short-circuit current(expected) | KV | 31.5 | |
| Maximum breaking current threshold | HZ | Fuse characteratic curve accorting | |
| Minimum breaking current | A | Fuse characteratic curve accorting | |
| Rated transfer current | KV | 50 | 1.5 |
| Maximum breaking current | KV | 1.8 | |
| Breaking OFF-load transformer capacity | KV/A | 1250 | |
| Rated cable charging current | A | 10 | |
| Rated active load current breaking times | Times | 10000 | |
| Opening time when striker strikes | S | <0.06 | |
| Earth switch thermal current switch | KA | 20(2S) | |
| Thermal stable current of earth switch | KA | 50 | 50 |
| Motor operating power supply voltage | V | AC/DC 110/220 | |
| ltem | Unit | Data | |
| FN12-10D/630 | FN12-10(R)D/125 | ||
| The total traveling distance of moving contact | mm | 200+8-2 | |
| Phase center distance (Before energy storage) | mm | 210±15 | |
| Moving contact overtravel distance | mm | 40±2 | |
| Auxiliary contact opening distance | mm | >150 | |
| Opening/Closing time difference among three phase | ms | <3 | |
| Opening speed | m/s | >2.8 | >2.8 |
| Closing speed | m/s | >3.8 | |
| Distance between metal flexible door and torch | mm | >125 | |
| Fracture distance of earth switch | mm | >150 | |
| Main circuit resistance | Ω | <120 | <300 |
| Maximum operating torque | NM | >160 | |
Ascending changes in the way we generate, transmit and use of electricity in developed economy or highly industrialised society, prioritised the maintenance of continuity of supply to consumers. With the goal to be integrated in smart cities, the safety of electrical equipment by fast disconnection of the power supply in case of fault events like leakage current, electrical arc, over current or overvoltage is taken care through switchgear such as disconnecting switches, circuit breakers, etc. For the systems up to 33kV, the more costly circuit breakers are getting replaced with load break switches. A load break switch is a type of switching device used for voltages in the range of 12 to 36 kV and must have the following capabilities:
- Interruption of current equal to its continuous current rating at the system voltage and the power factor of the normal load
- Designed to possess enough insulation to isolate the circuit in closed position.
- Interrupting small capacitive and inductive currents which is essential for disconnecting the unloaded overhead lines, transformers, cables, etc.
- Carrying the maximum fault current for the duration required by the interrupting device to clear the fault.
- Making on the terminal fault at rated voltage.
The basic functional difference between Load break switch and circuit breaker is that the former cannot interrupt the short circuit currents. The following figure 1 shows the how the load break switches are employed in a substation.