Pillar insulator and suspension insulator selection scheme

1 to 5 years

Detected at operating voltage

1) The detection period can be adjusted according to the deterioration rate of the insulator

2) For multi-component pin insulators, each component should be tested

1) Suspension insulators 1 to 5 years

2) Needle-type post insulators 1 to 5 years

1) Each of the pin-type post insulators
The insulation resistance of a component and each suspension insulator shall not be lower than 300MΩ, and the 500kV suspension insulator shall not be less than 500MΩ.

2) Insulation resistance of semiconductor glaze insulators

1) Use 2500V and above megohmmeter

2) Rod-type post insulators are not subjected to this test

1) Single element post insulator 1 to 5 years

2) Suspension insulators 1 to 5 years

3) Needle-type post insulators 1 to 5 years

4) With the main device

5) When replacing the insulator

1) The AC withstand voltage test voltage value of the post insulator is as specified in the regulations.

2) The AC voltage withstand voltage test value of the 35kV pin post insulator is as follows: two glue components, 50kV per element; three glue components, each component 34kV;

3) The voltage withstand voltage test voltage of the disc suspension insulator with mechanical damage load of 60-300kN is 60kV

1) 35kV pin post insulators can be carried out according to the requirements of the left column 1) or 2) according to the specific conditions.

2) Rod insulators are not subjected to this test

1 year

Refer to the regulations for the pollution level and the corresponding salt density
Check whether the measured salt density value and local pollution level are
Consistent. Combine the operating experience and adjust the measured value
The level of pollution-resistant insulation and the basis for supervising the safe operation of insulation. When the salt density value exceeds the regulation, measures such as adjustment, cleaning, and coating should be taken according to the situation.

Sampling at least one string of overhanging insulators and a rod-shaped struts that represent the local pollution level outdoors, and measuring the period of local pollution.