输出保护功能：过电压，过功率，短路。

The output protection function: over voltage, over power, and over short circuit.

由此引起的过电压频率通常为正常的工作频率。

The voltages set up are of normal operating frequency.

最后探讨了串联谐振式限流器对继电保护和电网过电压的影响。

Finally, the impact of series resonant current limiter on relay protection and over voltage in grid was explored.