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Technical requirements for high voltage insulators
2021-09-10 浏览: 1430 次

4.1 Basic Requirements

Hv insulator products shall meet the technical requirements of this standard, and other characteristics shall meet the provisions of GB/T5892 standard.

4.2 End Accessories

Zinc coating of high voltage insulator end accessories shall comply with JB/T8177. If the connection structure is ball and socket or groove type, the size of the connection structure should conform to the provisions of GB/T4056. Mechanical tensile failure load of ball and socket or groove connectors shall conform to JB/T8178. Mechanical tensile failure load of steel foot or groove joints shall be in accordance with "B/1'9677". For 160kN and above products, zinc layer should be inspected one by one and defect detection.

4.3 Umbrella cover materials

4.3.1 flame retardancy

The flame retardancy of umbrella cover materials for high voltage insulators should meet the requirements of FV-0 in GB/T13488 standard.

4.3.2 monk water-based

The water performance of umbrella cover materials for high voltage insulators shall meet the requirements of Appendix A.

4.3.3 Electrical and mechanical properties

The main electrical and mechanical properties of umbrella cover materials for high voltage insulators should meet the following requirements:

A) Volume resistivity not less than 1X 10 "a·m;

B) Breakdown strength is not less than 20kV/mm;

C) Creepage resistance and electrical erosion loss not less than TMA4.5:

D) Tear strength not less than 7kN/m

DL/T864-2004

E) Mechanical breaking strength is not less than 3MPa;

9) Shore hardness is not less than 500

4.4 mandrel

Composite insulator mandrel shall meet the following test requirements:

A) Water absorption rate is less than 0.05%;

B) The power-frequency dry withstand voltage shall meet the requirements of Article B.1.3 of Appendix B;

C) Lightning shock withstand voltage is not less than 90kV (LCM long);

E) Stress corrosion resistance time is not less than 96h, tensile failure load comparison test difference is less than 10%;

F) Dye penetration test shall meet the requirements of GB/T5892;

9) Water diffusion test shall meet the requirements of GB/T5892.

4.5 Corona and radio interference levels

High voltage insulators should meet corona test requirements. At the specified voltage of 1.1um / 10000 (Um is the highest operating line voltage), the wireless of high voltage insulators

The electrical interference level should not be greater than 60dB.

4.6 Manual pollution power frequency withstand voltage

High voltage insulators should meet the requirements of manual pollution power frequency withstand voltage test. Artificial pollution frequency tolerance voltage at a given equivalent salt density

It should meet operational requirements.

4.7 Power frequency arc

High voltage insulators should meet the requirements of power frequency arc test. The influence of electric arc should be considered in the design of metal accessories for high voltage insulators. Short circuit current size and

The duration of the current may cause damage to end accessories, mandrel and umbrella skirts. Appropriate arc protection should be designed.

4.8 Interface permeability

The high voltage insulators shall meet the requirements of the mechanical load time test and the permeability test of the interface between metal accessories and insulating sheath, and shall meet the requirements

Verify the permeability of metal fittings and umbrella suites interfaces and verify the requirements for rated mechanical load.

4.9 Altitude correction

When high voltage insulators are used at altitudes above 1000m, their external insulation shall be adjusted according to the provisions of GB311.1

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