SF6 Gas Insulation Combined Transformers
The combined transformer is for the current and voltage measuring and protection for the power systems.
Rated frequency: 50Hz or 60Hz
Rated voltage: 40.5kV~550 kV
Rated primary current: 50~8000A
Rated secondary current: 1A, 2A, 5A
Maximum output for CT: 50VA (GB, IEC standards), or B-1.8, C800 (IEEE standard).
The accuracy classes for CT: 0.2S, 0.2, 0.5S, 0.5, 5P, 10P, PX, PR, TPY, TPZ (GB, IEC standards), or 0.15, 0.3, C (IEEE standard).
Maximum output for VT: 500 VA (GB, IEC standards) or ZZ (IEEE standard).
The accuracy classes for VT: 0.2, 0.5, 3P (GB, IEC standards), or 0.15, 0.3 (IEEE standard).
Partial discharge: <5pC.
The bushing is made by silicon rubber or porcelain.
Safe service with a pressure relief device.
Insulation material is SF6 gas, long service life, there is a SF6 density monitor to monitor the gas pressure.
Needn’t any special maintenance, the leakage rate not exceed 0.1%/year.
Standards: GB/T 20840.1, GB/T 20840.4, IEC 61869-1, IEC 61869-4, IEEE C57.13