DDX1-12 Rated electrical parameters of products：
number | Parameter name | Unit | Technical date |
1 | Rated voltage | kV | 40.5 |
2 | Rated current | A | 630-6300 |
3 | Rated pre-expected short-circuit breaking current | kA | 50-200 |
4 | Current limit coefficient = cut-off current / the peak Value of Pre-expected Fault Current | % | 15~50 |
5 | Insulation level | Power frequency withstand voltage | kV/1min | 95 |
Lightning impulse withstand voltage | kV | 185 |
Product features and advantages
◆Strong short-circuit breaking capability ( large capacity ): rated breaking short-circuit current is 50kA～200kA
◆Breaking speed is fast (High speed): Total breaking duration:<10ms
◆The breaking process has obvious current limiting characteristics (Current limiting)
◆The action criterion adopts current instantaneous value and current change rate instantaneous value.
◆The current sensor is integrated with the fast-speed disconnector, and the structure is simplified
◆The electronic controller works independently in three phases through high temperature and strong interference tests to ensure the overall reliability of the product.
Product Usage
◆ Bypass current limiting reactor (energy saving, consumption reduction, reactive power elimination and power supply quality improvement)
◆ Parallel operation of sectionalized buses in large-capacity distribution system (optimizing load distribution and reducing network impedance)
◆ Short circuit protection of generator outlet or transformer low voltage side
◆ Short - circuit Protection of Branch Busbar and High Voltage Transformer in Power Plant