GB/T19519-2004 and power industry standard DL/T810-2002 have requirements for electrical tracking and electrical corrosion resistance of insulator materials.
4. Electrical mark judgment standard
4.1 Judgment Standard A:
When the current passing through the sample in the high-voltage circuit exceeds 60 mA, the end point is reached, and the overcurrent device cuts off the electricity.
Source, stop the test.
4.2 Judging C:
The end point is reached when the electrical trace reaches the mark on the surface of the sample at 25 mm from the lower electrode.
5. Test procedure
5.1 Preparation of the test
5.1.1 Unless otherwise specified, the test shall be carried out at ambient temperature (23 ± 2) ° C and five samples shall be tested for each material.
5.1.2 When the sample is loaded with a matt test face down, the 4 layers between the upper electrode and the sample have been cut (Figure 4).
Filter paper, then use screws to fix the sample and upper and lower electrodes to 45 with the horizontal plane. Angled bevel sample holder,
And measure the distance between the two electrodes (50 ± 0.5) mm as shown:
The silicon-acrylic AC-DC voltage and leakage tracking test for insulation is derived from the development of China's high-speed rail.
With the development of China's economy, in the past decade or more, the research and production of composite insulators in China have developed rapidly, and they have been widely used on high-voltage transmission lines, and production enterprises have increased rapidly. According to incomplete statistics, there are more than 30 companies that produce insulators, large and small. The quality of its products is basically improved, and it is likely that the product quality of more than 10 enterprises will basically meet the requirements of the domestic standard JB5892-91. However, some enterprises have not done formal positive-type tests on their own composite insulators, especially the umbrella sleeves for tracking and electric erosion resistance tests, and do not pay attention to product inspection. Enterprises are unclear about the quality level of their products and increase users. risks of. Although silicone rubber materials have superior electrical edge properties and good water repellency, they are widely used in AC/DC composite insulator umbrella sleeves. In fact, composite insulator silicone rubber umbrella sleeves have deteriorated with the increase of running time. Among them, leakage corrosion, corona discharge and arc ablation are the main reasons for the aging of silicone rubber materials.
GB/T19519-2004 and power industry standard DL/T810-2002 have requirements for electrical tracking and electrical corrosion resistance of insulator materials.
Therefore, the country has shown that the national standard GB/T19519-2004 and the power industry standard DL/T810-2002 have made requirements for the electrical tracking resistance and electrical corrosion resistance of the insulator material for composite insulators, and the TMA grade 4.5 is specified. However, the experimental conditions, test methods and determination results specified in International GB/T6553-2003 "Experimental Methods for Evaluating Electrical Resistance and Electro-Electrical Corrosion of Electrical Insulating Materials Used in Harsh Environments" are only applicable to AC-DC composite insulators. The experimental voltage is AC-DC power frequency (48-62HZ) voltage. For DC composite insulators, it is necessary to conduct electrical tracking and electrical erosion tests under DC voltage. DC resistance to electric trace and electric erosion test has its own characteristics, this article will discuss in detail the silicon rubber AC and DC high voltage leakage tracking test machine for insulation
Technical Parameters:
01, input voltage: AC-220V
02, output voltage: AC-0-5KV
03, electrical capacity: 7KVA
04, voltage test accuracy: <2%
05, high-voltage side output current: >1A
06, high-voltage side output current: >250MA, the maximum voltage drop <5%
07, current measurement accuracy: <1%
08, spray spray: >1M
09, the distance from the nozzle to the ground: >600CM
10, the distance between the nozzle and the sample: >500CM
11. The nozzle axis is at a 45 degree angle to the sample axis.
12. Spray speed at the sample: 3M/S
13, the spray amount is: 0.5mm / min
14, standard spray cycle: spray 10S, intermittent 20S
Sample preparation:
01, sample length: >150MM
02. Vertically cut the insulation on one end along the axial direction of the sample by about 20 mm to expose the conductor.
03. Around the sample insulation edge 100MM, the bare copper wire (2-3) circle with a diameter of about 1MM is wound perpendicular to the sample axis.
04, the other end of the sample should be properly insulated, or increase the length of the sample to prevent the discharge of the test liquid after the test.
GB/T19519-2004 and power industry standard DL/T810-2002 have requirements for electrical tracking and electrical corrosion resistance of insulator materials.
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