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Let's take a look at how the high-voltage leakage testing machine works?
Latest company news about Let's take a look at how the high-voltage leakage testing machine works?

High-voltage leakage testing machine mainly suitable for testing the resistance of electrical and electronic products, household appliances, and their materials to electrical trace and corrosion, simulating the use of liquid pollutants and inclined surface specimens at power frequency (48Hz -62Hz). Evaluate the resistance level of electrical insulation materials used under harsh environmental conditions through the measurement of resistance to electrification and corrosion..Under the influence of moisture and impurities in electrical products, insulation leakage may occur between charged parts of different polarities or between charged parts and grounded metal. The resulting arc can cause breakdown, short circuit, or material erosion due to discharge, and even lead to fire. This tester is a destructive test that simulates the above situation on insulation materials, used to measure and evaluate the relative resistance to leakage and marking of insulators under the action of an electric field and impurity containing water at a specified voltage. It is suitable for solid electrical insulation materials and their products in electrical and electronic products, household appliances, such as relay sockets, conversion switch covers, contactors, etc.

According to the requirements of GB/T6553-2014/IEC60587-1984 "Test Method for Evaluating the Resistance of Electrical Insulation Materials to Tracing and Corrosion under Severe Environmental Conditions" and DL/T810-2002 "Technical Conditions for ± 500kV DC Rod Suspension Composite Insulators", the simulation test items specified in the standard for AC/DC Leakage Tracing Test of Insulation Materials, applicable to rubber, plastic and other electrical insulation materials such as inclined plane method. Standard for five sets of silicone rubber testers and silicone testers

Test steps:

Preparation for the experiment: Unless otherwise specified, the experiment should be conducted at an ambient temperature of (23±2)℃, with five specimens tested for each material. When installing the sample, the matte test surface should be facing downwards, making it at a 45° angle with the horizontal plane. As shown in Figure 3b, the distance between the two electrodes is (50 ± 0.5) mm

Note:Use new filter paper pads for each experiment.

Firstly, inject the contaminated liquid into the filter paper liner to fully moisten the filter paper. Adjust the flow rate of the contaminated liquid and correct the flow rate according to the provisions in Table 1. Observe the flow for at least 10 minutes to ensure that the contaminated liquid flows steadily down the surface of the sample between the two electrodes. The contaminated liquid should flow out from the axial hole of the upper electrode instead of overflowing from the side or top of the filter paper.

Apply voltage

Method 1: Constant voltage tracing method.

When the contaminated liquid flows uniformly at the flow rate specified in Table 1, close the switch and increase the voltage to one of the more suitable voltage values of 2.5 kV, 3.5 kV, or 4.5 kV. Start timing and keep the voltage constant for 6 hours.

If it is necessary to test at a higher or lower voltage, another set of five samples will be taken for each preferred test voltage for testing.

The constant electrical trace voltage is the highest voltage at which all five samples have not been damaged after being subjected to 6 hours.

Materials are classified as follows:

Level 1A0 or 1B0: According to judgment standard A or judgment standard B, if any sample fails within 6 hours at 2.5kV;

Level 1A2.5 or 1B2.5: If all five specimens can withstand a voltage of 2.5kV for 6 hours and any specimen fails within 6 hours at 3.5kV;

Level 1A3.5 or 1B3.5: If all five specimens can withstand a voltage of 3.5kV for 6 hours and any specimen fails within 6 hours at 4.5kV;

Level IA4.5 or 1B4.5 : If all five samples can withstand a voltage of 4.5kV for 6 hours; In each case, the maximum depth of erosion should be reported

Method 2: Stepwise voltage tracing method:

Choose a starting voltage with a value that is a multiple of 250V, starting from the beginning, so that there is no violation of judgment standard A (current exceeding 60 mA) before the third level voltage (a preliminary test may be required). When the contaminated liquid flows uniformly at the specified flow rate, close the switch and increase the voltage to the selected value, maintain the voltage for 1 hour, and then gradually increase the voltage by 250 V every hour until the damage according to judgment standard A occurs, and record it.

The stepwise electrochemical voltage is the highest voltage at which all five samples have not been damaged after being subjected to 1 hour.

If you want to know the relevant parameters, specifications, and specific equipment solutions of the high-voltage leakage testing machine, you can visit our official website for consultation.

Pub Time : 2024-05-27 16:39:40 >> News list
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