Test on Lighting Impulse Withstand Voltage of the Three Gorges Right Bank 550kV GIS Substation
Feng Huo · Gao dianya jishu · 2011
With the rapid development of power system in China,more and more GIS are adopted in new substations.Lighting impulse withstand voltage tests are recommended after the installation of GIS in order to test the GIS insulations and reduce the risks of equipment failure.However,due to the design and manufacturer,traditional impulse generators cannot generate standard lighting impulse with large capacitive load such as GIS.Consequently,based on the test on GIS of the Three Gorges Right Bank 550 kV substation,models of lighting generators and GIS are established and relative simulations are carried out.The results show that adding oscillating inductor to the generator is a good method to generate oscillating lighting impulse which meets the requirements of test.This method is successfully used in the tests and the results are satisfied.Valuable experience has been accumulated for the lighting impulse tests on GIS of 750 kV,1000 kV substations in China.