Insulation resistance of winding and final screen 1) Before commissioning 2) 1 to 3 years 3) After overhaul 4) When necessary 1) Winding insulation resistance and initial value and previous data 2) Capacitive current transformer at the end of the screen to the ground insulation Ratio check of each tap 1) After overhaul 2) When necessary Tgδ and capacitance 2) After 1 to 3 years 3) After overhaul 4) When necessary 1) The main insulation tgδ(%) should not be greater than the values ​​in the table below, and should not be significantly changed compared to the calendar year data: 2) Oil-paper capacitance type tgδ is generally not converted by temperature. When tgδ is significantly increased compared with the factory value or the previous test value, the relationship between tgδ and temperature and voltage should be comprehensively analyzed. When tgδ changes significantly with temperature or the test voltage is 10kVT When rising to Um/√3, the tgδ increment exceeds ±0.3% and should not continue to run. 3) Solid insulation transformers can be measured without tgδ Voltage level kV 20 66 220 330 Big Oil paper capacitor 3.0 1.0 —— —— Oil-filled 2.5 2.0 0.7 0.6 Tape capacitor type —— 2.0 —— —— Transport Oil paper capacitor 3.5 1.0 —— —— Oil-filled 3.0 2.5 0.8 0.7 Tape capacitor type —— 2.5 —— —— 2) When the main insulation capacity of the capacitive current transformer differs from the initial value or the factory value by more than ± 5%, the cause should be ascertained. 3) When the insulation resistance of the capacitive screen type current transformer to the ground is less than 1000MΩ, the final screen to ground tgδ should be measured, and its value is not more than 2%. Primary winding DC resistance measurement 1) After overhaul 2) When necessary AC withstand voltage test 2) After overhaul 3) When necessary 1) The primary winding is performed at 85% of the factory value. Tested at the following voltages with unknown factory values: Voltage level kV 3 6 10 15 20 35 66 Test voltage kV 15 twenty one 30 38 47 72 120 2) 2kV between the secondary windings and the final screen to the ground 3) After all the winding insulation is replaced, it should be carried out according to the factory value. Polarity check 1) After overhaul 2) When necessary
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Comparison, there should be no significant changes
Resistance is generally not less than 1000MΩ
Using 2500V megohmmeter cycle Claim Description
Conforms to the nameplate logo
The ratio difference and phase difference should be measured after the winding is replaced. cycle Claim Description
1) Before commissioning
1) The main insulation tgδ test voltage is 10kV, the last screen pair
Ground tgδ test voltage is 2kV
~
35
~
110
~
500
repair
Rear
Row
in cycle Claim
There should be no significant difference from the initial value or the factory value. cycle Claim
1) 1 to 3 years (20kV and below) cycle Claim
Conforms to the nameplate logo