Engineering Case Analysis Based on the Relay Protection Setting Principle for the Distribution Network
Due to the limitation of current transformer ratio and setting range,the setting value of on-site protection device can not be set normally.According to the relay protection setting principle for the distri-bution network,two scenarios of"quitting overcurrent Section I protection"and"setting based on the max-imum value of the device"are analyzed for specific cases,and it is determined that"quitting overcurrent Section I protection"can realize graded coordination,avoid simultaneous or override tripping of switches at all levels,reduce the scope of power outage and improve the reliability of power supply.
distribution networkrelay protectionsettingsetting calculationfeeder line switchgraded coordinationselectivity
NETL
NSTL
万方数据
