Insulation resistance of winding and final screen

cycle Claim Description

1) Before commissioning

2) 1 to 3 years

3) After overhaul

4) When necessary

1) Winding insulation resistance and initial value and previous data
Comparison, there should be no significant changes

2) Capacitive current transformer at the end of the screen to the ground insulation
Resistance is generally not less than 1000MΩ



Using 2500V megohmmeter

Ratio check of each tap

cycle Claim Description

1) After overhaul

2) When necessary


Conforms to the nameplate logo


The ratio difference and phase difference should be measured after the winding is replaced.

Tgδ and capacitance

cycle Claim Description









1) Before commissioning

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:








1) The main insulation tgδ test voltage is 10kV, the last screen pair
Ground tgδ test voltage is 2kV

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
~
35

66
~
110

220

330
~
500

Big
repair
Rear

Oil paper capacitor

3.0

1.0

——

——

Oil-filled

2.5

2.0

0.7

0.6

Tape capacitor type

——

2.0

——

——

Transport
Row
in

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

cycle Claim

1) After overhaul

2) When necessary


There should be no significant difference from the initial value or the factory value.

AC withstand voltage test

cycle Claim



1) 1 to 3 years (20kV and below)

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

cycle Claim

1) After overhaul

2) When necessary


Conforms to the nameplate logo

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