Knowledge about Gas Insulated Substation Testing and Application
To provide the function and safety of the GIS installation for which it was designed, the GIS has to be tested. The testing procedure is done to confirm the technical information and the safe operation of the GIS installation over its life duration. Related to the GIS installation use, the main tests are dielectric tests, short-circuit tests, mechanical tests, and temperature rise tests. Two different test processes are used: type tests which are also known as design tests, and routine tests, which are known as factory or production tests. While type tests confirm the functions of one GIS type after product development, routine tests check that each manufactured item functions according to the technical demands to which the GIS installation should adhere to.
What are the Type Tests for GIS?
One of the crucial steps in the development of GIS equipment is type tests. They are done to check the performance of the GIS equipment. The ratings defined in the type tests will also be declared as default data when the GIS equipment is in the production cycle. Type tests at least include:
- Measurement of the resistance of the main circuits
- Tightness tests
- Temperature rise checks
- Short-time withstand current and peak withstand current tests
- Dielectric checks- Electromagnetic compatibility (EMC) test
- Check the degree of protection of the enclosure- Switch operating mechanical life tests
- Check making and breaking capacities
- Verifications to check performance under thermal cycling and gas tightness tests on insulators
- Proof tests for enclosures
- Low and high-temperature verifications
- Pressure test on partitions- Fault-making capability of high-speed earthing switch
- Circuit breaker design tests