This paper introduced the process of a hydrogen explode at 600 MW generator,analyzed the explode cause from the aspects of hydrogen displacement and electric test,then some suggestions and measures are proposed for gas displacement in generator and electric test.

The paper discusses present methods of electric tests for generators in China, a new multifunctional supervision test system for parameter measurement of generators, electric start-up test and failure records is introduced, and the advantage, practicality and special characteristics of the system are presented.

This paper introduces how NGK Tangshan Electroceramics Company Limited to realize the control of the varying speed regulation of the electric engine in the electrical tests by using the frequency- transformer,and probes into the advantages of the speed- control by frequency- transformer comparing with the speed- control by electric engine under the traditional mode.

The construction technology for the in-situ insertion of generator stator winding rods and the results of the electrical tests of generator stator are presen.

The maintenance and testing methods for such main equipment as the transformer and the GIS of underground substations are presented,including the electrical testing scheme and equipment maintenance strategies.

The Substation Electrical Testing Coach(EST-C1) is used for high voltage electrical equipment in substation or feeder station s preventive test and project s handing over test.