Influence of AC Interference to DC Bus on Integrated Protection of Microcomputer and Countermeasures
The study theoretically analyzes how an AC power flow penetration into positive and negative poles of the DC bus in the substation and the optocoupler of the external tripping input circuit of the microcomputer integrated protection impacts microcomputer relay based on specific circuit parameters and integrated protection equipment.Multisim simulation is used to simulate the voltage waveform at both ends of the coupling during AC disturbance,verifying the cor-rectness of the theoretical analysis.The strategy of using high-power intermediate relays for resetting important tripping circuits is proposed,and the selection of action power and action time of intermediate relays is analyzed,which provide useful information for engineering applications.
AC disturbanceoptocouplerdistribution capacitanceresetting intermediate relay
万方数据
维普
