The intrusion way of over-voltage like lightning into computer (electronic system) was intro- duced, and the protection methods against over-volt- age from circuits and ground were studied.
介绍了雷电等过电压侵入计算机（或电子设备）系统的途径，研究了如何防止由线路和地线进入的过电压。
2
We also should take protective measures for the volt power bright spots that produced by the series voltage resonance and the higher harmonic produced by the Electronic Ballast.