Key points of antifouling flashover coating detection for insulators

Devices installed between conductors of different potentials or between conductors and grounding members that can withstand the effects of voltage and mechanical stress. Insulators are of various types and shapes. Although the structure and shape of different types of insulators vary greatly, they are basically composed of two main parts: the insulator and the connecting fixture. It is called insulator in order to increase the creepage distance, usually made of glass or ceramic. Insulators do not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions, which is one of the major roles of insulators embodied.

Anti-pollution Flashover Coating, on the other hand, is a measure to deal with it. To ensure the effectiveness of this measure, it is necessary to test it. The following shares the insulator Anti-pollution Flashover Coating detection techniques.

A, insulator Anti-pollution Flashover Coating detection points
 
1, insulators Anti-pollution Flashover Coating of various technical properties should meet the relevant requirements of DL/T 627. Before coating according to DL/T 627 inspection rules to test the quality of the coating, inspection after passing before applying.

2、After curing, the newly coated insulator Anti-pollution Flashover Coating should be smooth, smooth, no bubble, no drawing, no leakage, no leakage of coating.

3、The thickness of Anti-pollution Flashover Coating is 0.3-0.5mm, which can be detected by coating thickness gauge or rubber thickness gauge.
 
4、The appearance of Anti-pollution Flashover Coating should be inspected within a few days after coating. If defects, peeling, flaking or uncured are found, it should be dealt with in time.

2、Interpretation of Anti-pollution Flashover Coating water repellency test

(1) Measurement point selection

Each line of different manufacturers, different batches of products should be selected as a string of insulators as a measurement point. The insulator string should be the worst insulator string in the batch of coated insulators in the operating environment. Take the second piece on the cross-arms side (low-voltage side), the middle piece and the second piece on the conductor side (high-voltage side) to test the upper and lower surfaces.

(2) Anti-pollution Flashover Coating Surface Water Repellency Test Method

According to the water repellency test method of conductor and ground composite insulator, the water repellency level of the coating is judged.

(3) Judgment method

Hydrophobic grading results for 1-4, record the measurement results, do not take other measures; hydrophobic grading results equal to or less than 5, should be taken from the field samples, sent to the laboratory of qualified testing units for comprehensive hydrophobic testing.

The monitoring of Anti-pollution Flashover Coating insulators in operation shall be strengthened to observe the coating for peeling, cracking and strong discharge sound, especially in areas with serious cement pollution or chemical pollution (e.g. chlorine, sulfide) and large accumulation of dust in a short period of time.

Water repellent monitoring points should be set up for coated insulators in operation and measured regularly. The testing period is one year. When the hydrophobicity monitoring value is lower than the specified value, samples should be sent to qualified testing units for comprehensive hydrophobicity testing. If the comprehensive hydrophobicity test result still does not meet the requirements, the Anti-pollution Flashover Coating is considered unqualified and should be recoated.