500 kV auto-transformer with neutral point grounded through small reactance;

To understand overvoltage change at a 500 kV autotransformer neutral when the neutral is grounded from directly to through a small reactance,the overvoltage at autotransformer’s neutral and entrance is calculated respectively by ATP-EMTP,and the overvoltage for adopting small reactance grounding is analyzed to determine overvoltage protection and insulation coordination.

Effect of neutral grounded by low reactance to the switching over-voltage for Gongboxia transformer;

On the basis of theoretic analysis of limiting short circuit current by low reactance grounding transformer neutral point,and combining engineering practices,according to the effects of current limiting of adding low reactance at neutral point under different operation modes,the effects of current limiting after low reactance was added are analyzed.

The paper introduces the structure, parameters and technical requirements of the small reactor used in 220 kV Yucun Substation demonstrative project in Putang, Henan Province.

Optimized neutral reactor design of shunt reactor for UHV double-circuit lines

The parameters of neutral reactor for HV shunt reactors and the line ground switch are selected.

For the two arc extinction schemes-using high speed grounding switch and using the neutral reactor compensation to shunt reactor,the computation of secondary arc current and recovery voltage was presented here,based on a ATP simulating model of 750 kV power system.