Change to find the neutral point grounding way

Power distribution system adopts or neutral point grounding through petersen coil grounding

method,advantages and disadvantages."Defects" for troubleshooting difficulties and some of the

resulting personal property security,users themselves do further thinking,thinking out of the

solution there are pumps two main types:(1) change the neutral to the small resistance grounding.Using the outlet circuit breaker after the modification of zero sequence protection and short circuit fault indicator,two pieces can basically to solve the problem of the grounding troubleshooting the drop about 70%,but there are about 30% of the resistance and high resistance grounding fault in bad to find,also have problems with line fuse protection.

In this system,a better solution is to use digital fault indicator,the line zero sequence current (cable),line (overhead),the total current to ground insulation voltage (overhead),and other indicators of measuring data is sent by wireless communication network to dispatch system,through the comprehensive analysis of substation real-time and historical information,but induction motor sales the judge site location. 2 neutral point to the small resistance + + high voltage contactor resistance in the circuit breaker or pattern.Circuit breaker or high voltage contactor in points at ordinary times,only when the zero sequence voltage detected system raised after the delay switch,short time into a small resistance or resistance grounding,then through a detection method for small resistance grounding mode to find fault.In addition,due to the neutral point resistance of on- off control flexibility,can be in arc suppression coil action later,go electricalmotor1.blogspot.com to a certain time sequence to control the on-off of the resistance,so that the protective device or grounding fault indicator to identify the signal and indicates the current path.