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• Time of issue:2020-05-10
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(Summary description)
　　The power test is divided into handover test and preventive test, so let’s talk about the handover test items and standards of conventional transformers today.

　　Combined wind power generation series

　　1 Measure the DC resistance of the winding and bushing

　　2 Check the voltage ratio of all taps

　　3 Check the three-phase wiring group of the transformer and the lead wire of the single-phase transformer

　　4Measure the insulation resistance of the iron core and clamps

　　6Measure the insulation resistance, absorption ratio or polarization index of the winding and bushing

　　7 AC withstand voltage test of winding and bushing

　　8 Long-term induction withstand voltage test of winding and bushing with partial discharge measurement

　　9 Insulating oil test or SF gas test

　　10Check the phase

　　The test items of oil-immersed power transformers with a capacity of 2500kVA and below are: insulating oil test or SF gas test, measuring the DC resistance of the winding and bushing, checking the voltage ratio of all taps, and checking the three-phase wiring group and single-phase of the transformer Lead out the transformer, measure the insulation resistance of the iron core and clamps, AC withstand voltage test of the winding and bushing, check the phase

　　Dry-type transformer test items: Measure the DC resistance of the winding and bushing, check the voltage ratio of all taps, check the three-phase wiring group of the transformer and the lead wire of the single-phase transformer, measure the insulation resistance of the core and clamps, and measure the windings Together with the insulation resistance, absorption ratio or polarization index of the bushing, the AC withstand voltage test of the winding and the bushing, and the long-term induction withstand voltage test of the winding and the bushing. With partial discharge measurement, check the phase

　　Check the three-phase wiring group of the transformer and the polarity standard of the lead wire of the single-phase transformer

　　The three-phase wiring group of the transformer and the polarity of the lead wire of the single-phase transformer should match the mark on the nameplate and the symbol on the shell.

　　Standards for measuring the insulation resistance of cores and clamps:

　　The insulation resistance of the core to the ground, the insulation resistance of the clamp to the ground, and the insulation resistance of the core to the clamp should be measured.

　　For transformers undergoing body inspection, the insulation resistance of accessible through bolts, iron clamps and strapping steel belts to the iron yoke, iron core, fuel tank and winding pressure ring shall be measured.

　　After the completion of all installation work of the transformer, the insulation resistance of the iron core to the ground, the clamp with external grounding wire to the ground and the iron core to the clamp should be measured.

　　Measured with a 2500V megohmmeter, the duration should be 1min, and there should be no flashover and breakdown