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ONSITE TESTING OF GAS INSULATED SUBSTATIONS WITH AC VOLTAGE : 

ONSITE TESTING OF GAS INSULATED SUBSTATIONS WITH AC VOLTAGE

GAS INSULATED SUBSTATIONS(GIS) : 

GAS INSULATED SUBSTATIONS(GIS) What is GIS? GIS is a compact multi component assembling enclosed in a ground metallic housing. The gas used in GIS is Sulphur Hexaflouride (SF6) gas.

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GIS has small ground space requirements. Gas insulated Substations have easy maintenance( nearly zero maintenance ). Less field erection time & less erection cost. For underground powerhouse of Hydro electric power project where space constraint is a major issue. For Fast Growing Major Cities where land availability is costlier . Non-Flammability & Non-Explosive , Oil-free & Less Pollution WHY WE NEED GIS

COMPONENTS OF GIS : 

COMPONENTS OF GIS Core Winding SF6 Gas Gas Cooler Gas Blower

ON SITE TEST METHODS OF GIS : 

ON SITE TEST METHODS OF GIS SF6-insulated test transformer systems of the type EFS. Conventional series resonant test systems of the insulating cylinder type RZ. SF6-insulated resonant test systems with variable frequency of the type RSS. Partial discharge measurements on GIS.

SF6-INSULATED TEST TRANSFORMER SYSTEM OF THE TYPE TES : 

SF6-INSULATED TEST TRANSFORMER SYSTEM OF THE TYPE TES These are designed for short time duty. The maximum output voltage is up to 1000KV. The TES-system can either be directly flanged to a GIS or used in combination with a SF6/Air bushing. A TES system which is possible to tilted hydraulically as well as vertically.

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Figure 2:510 kV, 105 kVA test system

CONVENTIONAL SERIES RESONANT TEST SYSTEMS OF THE INSULATING CYLINDER TYPE RZ : 

CONVENTIONAL SERIES RESONANT TEST SYSTEMS OF THE INSULATING CYLINDER TYPE RZ These type are designed for a longer test duty and higher power rating. Output power is up to 800KVA. Using this design several modules can be cascaded to increase the test voltage. The UHF PD measuring method is preferred when using this test arrangement.

SF6-INSULATED RESONANT TEST SYSTEM WITH VARIABLE FREQUENCY OF THE TYPE RSS : 

SF6-INSULATED RESONANT TEST SYSTEM WITH VARIABLE FREQUENCY OF THE TYPE RSS The weight to power rating ratio can be optimised to approx.0.6 kg/KVA. The test circuit is tuned to the resonant condition by means of adjusting the frequency. the frequency range of the system is fmax/fmin = sqr(cmax/cmin)

PARTIAL DISCHARGE MEASUREMENTS ON GIS : 

PARTIAL DISCHARGE MEASUREMENTS ON GIS This method can be further classified into three types. Conventional PD measurements. Acoustic PD measurements. UHF PD measurements.

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