变电站微机电源防雷保护研究

微机保护系统是电力系统的重要组成部分,但由于其耐压水平低,雷电波侵入电源系统时易导致设备的损坏,严重影响了电力系统的正常运行。依据雷电波侵入变电站微机电源的途径,建立模型,并进行了分析。根据雷电波的特点,在电源装置前加装电源防雷吸收装置,通过对其进行ATP仿真,表明该装置对雷电波有较好的削波效果。同时还对电源线电缆进行屏蔽接地设计,以减少地电位干扰,降低了雷电波对变电站微机电源系统的危害,提高了电力系统供电的可靠性。

Study on Lightning Protection of Computer Power Supply in Substation

The computer protection system constitutes a major component of power system.But the invasion of lightning surge may lead its failure due to its low voltage withstand level which may affect the normal service power system.A model was build and experimented along the path of lightning surge invasion.A surge absorbing device was installed in front of power supply device,which showed a good surge-chipping effect at ATP simulation.A grounding shield was provided for power conductors to reduce interference of earth potential which released the hazard of lightning surge to computer power supply device of substation and raised the power supply reliability of system.