Insulator material of electric mark and electric erosion resistance requirements

by:Mings     2020-06-24

GB / T19519 - And electric power industry standard DL/T810-2004 2002 to the insulator material of electric mark and electric erosion resistance made requirements

4. Electric mark judgment standard

4. 1 criterion A: when the sample of high pressure loop current through more than 60 ma reached the destination, the over-current device to cut off the power supply, stop the test.

4。 2 criteria B:

when electric mark reaches from the electrode under 25 mm place tags on the surface of the sample arrives at the finish line.

5。 Test program

5. 1 test preparation

5. 1. 1 unless otherwise specified, the test shall be at ambient temperature ( 23 and 2) Tested five sample, under each material.

5。 1. 2 sample when loading test for matt, between the electrodes and the sample pad 4 layer had been cut, As shown in figure 4) The sample of filter paper, and then use the screw and the upper and lower electrode is fixed with water level 45. Angle of inclined plane sample rack, and to measure distance between two electrodes ( 50 and 0. 5) Mm as shown:

with silicone rubber insulation ac/dc withstand voltage tracking test is the result of the development of high-speed rail to do the detailed introduction

along with the increasingly development of economy, in recent ten years, the research of composite insulator in our country, the production has been developing rapidly and widely used in high voltage transmission lines, the production enterprise to increase rapidly. According to incomplete statistics, large and small production if there are more than 30 enterprises of insulator. Its in basically improve product quality, is likely to be dominated by more than 10 enterprises product quality achieves the national standard JB5892 - The requirements of 91. But there are also some enterprises for their production of composite insulator to do regular formal type test, especially the umbrella cover tracking and electrical erosion resistance test, do not take the product inspection, business for their products quality level is not clear, increasing the risk of the user. Though silicone rubber material has excellent electrical performance edge and good hydrophobic, umbrella cover in the ac/dc composite insulator, widely used, but in fact the silicone rubber composite insulators umbrella set as the growth of the running time and appeared aging, leakage corrosion, corona discharge and arc ablation is a major cause of aging of silicone rubber material.

GB / T19519 - And electric power industry standard DL/T810-2004 2002 to the insulator material of electric mark and electric erosion resistance made requirements

so presented the national standard GB/T19519 - And electric power industry standard DL/T810-2004 2002 for insulator composite insulator material of electric mark and electric erosion resistance made requirements, reach TMA4 regulations. Level 5. But international GB/T6553 - 2003 'evaluation of electrical insulating materials to use in harsh environment conditions of electrochemical and electrical electrical erosion resistance experiment method, experimental conditions, the test method and determine the results are only suitable for ac/dc composite insulator, the experiment voltage of ac/dc power frequency ( 48 - 62HZ) Voltage. For dc composite insulator, it is necessary in electric mark under dc voltage and electric erosion experiment. Dc electric mark and electric erosion resistance experiment has its own characteristics, this paper will discuss the detail with silicone rubber insulation AC/dc high voltage tracking tester

technical parameters:

: 01, input voltage AC - 220 v

: 02, output voltage AC - 0 - 5 kv

03, electric capacity: 7 kva

4, voltage test accuracy: 1 a

6, high side output current:> 250 ma, the biggest drop 600 cm

10, nozzle distance sample distance:> 500 cm

11, nozzle axis and the axis of the sample a 45-degree Angle

12, sample spray speed: 3 m/S

13, spray quantity as follows: 0. 5 mm/min

14, standard spray cycle: spray 10 s, intermittent 20 s sample preparation:

01, sample length:> 150 mm

02, vertical resection end along the axis of the sample about 20 mm, the insulation of the bared conductors

3, before the sample 100 mm insulation blade, perpendicular to the axis of the sample wire on bare copper wire (about 1 mm in diameter 2 - 3) Ring

4, on the other side of the sample should be properly insulating treatment, or adopt the way of increasing the sample length, to prevent adhesion test liquid in the process of the experiment after discharge.

GB / T19519 - And electric power industry standard DL/T810-2004 2002 to the insulator material of electric mark and electric erosion resistance made requirements


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