1.Application

      SF6 gas -filled testing transformers are especially designed for GIS in the factory and on-site test,and for testing all GIS switchgears and GIS components such as insulators,insulating tension pole,GIS voltage transformer and so on,the PD test can be performed under the general environment because of the merits of encapsulation ,the PD level of our equipment can be lee than 3pC,and it can be added a HV bushing to perform the withstand voltage test at the same time.

2.Benefits

       Small and compact dimensions resulting in minimum space requirements . Light-wight components. Rugged construction to withstand long transportation stresses. Direct flanging to the test object. High safety for tester because of encapsulation of all HV parts . Large range of application in conjunction with HV bushing for withstand voltage test. Built-in HV measuring capacitor and coupling capacitor. Built-in HV disconnecting switch to separate multipath test object connector to ensure the safety of HV testing.

3.Basic components

• Column type voltage regulator(Frequency variable power source used in the GIS voltage transformer test system)
• Insulating transformer type GLB
• Compensating reactor type BLC
• HV testing transformer type GTU
• HV Capacitive divider type CDT
• A basic test interface
• Computerized control system type SBK

4 .Available Options

•  Coupling capacitor type OWF
• Partial Discharge detectors
• SF6 HV bushing and disconnecting switch
• Various connection or adaptation flanges according to different test object
• Universal adjustable platform for testing GIS switchgear.
• Standard voltage transformer(Only for GIS voltage transformer testing system)

5.Function of the testing  system

• The encapsulated test transformer is a conventional transformer and steps-up the voltage coming from the regulating transformer.The compensating reactor connect with the HV transformer primary winding to compensate the capacitive current.(The HV transformer LV side have an independent compensating winding )
• For the onsite testing system ,the voltage regulator,compensating reactor ,Isolating transformer and control system are integrated into a cabinet.This gives a most compact equipment with a minimum number of components to be transported and connected for testing.
•  Using HV disconnect switch to disconnect all type test object connector to achieve widely use.
• Three-phase change-over switch to test three phase in box system.
•  Universal adjustable platform to make HV transformer flange test object more conventional