SF6 insulated test transformers are especially designed for testing metal-clad switchgear(GIS) ，Gas-insulated Metal Enclosed Transmission Line（GIL) in the factory and on-site,and for testing on-site substation equipment.The conventional transformers can be flanged directly to the GIS/GIL.This makes testing of such GIS installations possible without feeding them through an air-SF6 bushing.Therefore,the merits of the encapsulation remains effective also during the testing which is of importance for Partial-Discharge tests.These systems are particularly suited for on-site tests of GIS/GIL after assembly.In the factory,they allow to test sub-assemblies and components directly in the manufacturing line,thus avoiding transportation to a central test facility,and extra handling.

system components:

1. Regulating transformer 
2. Power line filter 
3. Compensating reactor 
4. Low voltage protection unit (included in systems rated 510 kV or higher) 
5. Test transformer 
6. Control system  for factory tests  
7. Regulating cubicle with control panel for on-site tests 

Available Options:

1. Encapsulated coupling capacitor 
2. SF6-air bushing and various connection or adaptation flanges between test
3. transformer & bushing & coupling capacitor & test object.
4. Specific base frames or containers for on-site testing.
5. Encapsulated standard capacitor 
6. Control system
7. HV and grounding connections if bushing is used. The connection to test object is usually not included.
8. Partial Discharge detectors
9. Capacitance and power loss factor measuring bridges
10. Other devices upon request.

Overall parameters:

1. Voltage levels:100kV,200kV,250kV,300kV,500kV,800kV,1000kV.
2. Capacity:50-2000kVA
3. Methods of high voltage generation:High voltage transformer boosting and series resonance(power frequency,variable frequency),all boosting methods are single-stage boosting without cascade boosting.
4. Input voltage(primary voltage):0.35-10kV
5. Partial discharge amount of equipment:1-3 pc under rated voltage(normal environment)
6. Temperature rise:The temperature rise does not exceed 65k when the rated current operates for 60 minutes(50Hz).

1. High voltage is fully sealed in a shielded space,ensuring safe and reliable experiments.
2. The overall partial discharge can be controlled within 1-3 pc.
3. It has a small volume,occupying the minimum space and lightweight components.
4. Built-in high voltage isolation switch enables multi-purpose use.
5. Easy to connect,directly connected to the test sample,making experiments more convenient.
6. Capable of withstanding long-distance transportation with a sturdy and durable structure.
7. Reduced requirements for system power capacity.

SF6 insulated test transformers are especially designed for testing metal-clad switchgear(GIS), Gas-insulated Metal Enclosed Transmission Line（GIL) in the factory and on-site,and for testing on-site substation equipment.The conventional transformers can be flanged directly to the GIS.This makes testing of such GIS/GIL installations possible without feeding them through an air-SF6 bushing.Therefore,the merits of the encapsulation remains effective also during the testing which is of importance for Partial-Discharge tests.These systems are particularly suited for on-site tests of GIS after assembly.In the factory,they allow to test sub-assemblies and components directly in the manufacturing line,thus avoiding transportation to a central test facility,and extra handling.