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The difference between the leakage tracking tester and the high voltage tracking tester
Both the leakage tracking testing-equipment' target='_blank'>tester and the high-voltage tracking tester are test equipment used to detect a certain physical property of insulating materials, but the physical properties detected by the two are different, so the test standards they are based on are also Different. Next, we will detail the main differences between the two. 1. Definition and difference The high-voltage tracking tester is to simulate the use of liquid contaminants and inclined plane samples at power frequency (48Hz - 62Hz) to evaluate the electrical tracking resistance and corrosion resistance measurement under harsh environmental conditions. Tracking and corrosion resistance rating of insulating materials. Tracking refers to the continuous deterioration of a solid insulating surface due to localized electrical discharges and the formation of conductive or partially conductive paths. The tracking tester is a test to simulate whether the conductive substances deposited on the surface of the insulating material by the live parts of different polarities in the actual use of the household electrical appliance products cause the surface of the insulating material to creep, breakdown short-circuit and fire hazards. Specific Tracking Index and Tracking Resistance Index. Tracking refers to the formation of conductive channels on the surface of solid insulating materials and/or inside the sample under the combined action of electrical stress and electrolytic impurities. 2. The main basis of the national standard to distinguish the high-voltage tracking tester The national standard on which the high-voltage tracking tester is based is GB/T6553-2014 'Test Method for Evaluating Tracking Resistance and Corrosion of Electrical Insulating Materials Used in Severe Environmental Conditions' The national standard on which the tester is based is GB/T4207-2012 'Measurement Method of Tracking Resistance Index and Comparative Tracking Index of Solid Insulating Materials'. In the specified size (2mm×5mm) between platinum electrodes, - apply a certain voltage and drop a conductive liquid (0.1% NH 4CL) with a specified volume of droplets at a fixed height (35mm) at regular intervals (30s) to evaluate the surface of solid insulating materials in electric field and humidity or humidity. The leakage resistance performance under the combined action of the polluted medium was measured, and its comparative tracking index (CT1) and tracking resistance index (PT1) were determined. Liquid contaminants and inclined plane samples for high-voltage tracking tests are used to evaluate the tracking resistance and corrosion resistance grades of electrical insulating materials used in harsh environmental conditions through the measurement of tracking resistance and corrosion resistance. 4. Difference of test circuit The circuit principle of the tracking test is to apply a positive selection wave voltage on the electrode, which varies between 100V~600V, the frequency is 48Hz~62Hz, the voltage measurement device indicates a true RMS value, and the maximum error is 1.5%. The power of the power supply should not be less than 0.6kVA, and the test circuit diagram is shown in Figure 1. The variable resistor should be able to adjust the short circuit current between the electrodes to 1.0A±0.1A, and at this current, the voltage drop indicated on the voltmeter should not exceed 10%, and the maximum error of the short-circuit current measurement device is±3%. The input power supply voltage of the test apparatus shall be sufficiently stable. When the effective value of the current is 0.5A, its relative tolerance is±10% for 2.00s, the relative tolerance of the device is±10%, overcurrent should act. The circuit principle of the high voltage tracking test is: since the test is carried out under high voltage, the safety bar should be used for safe contact, and the circuit composition is as follows. The power frequency is 45Hz~65Hz, the output voltage can be adjusted to about 6kv, and is stable at±5%, and the rated current for each sample shall not be less than 0.1A. For methods, the preferred test voltages are 2.5kv, 3.5kv and 4.5kv. 5. The electrode material used in the test is different from the high-voltage tracking test. All electrodes, fastening devices and assemblies connected to the electrodes, such as screws, should be made of stainless steel (for example: grade 302). The electrodes used in the tracking test should use the smallest electrode Platinum electrodes with a purity of 99% should have a cross section between the two electrodes (5±0.1) mm, there are 30°±2°Bevel, the edge of the bevel is approximately 0.01mm flat±0.1mm wide. 6. Differences in the size of the test sample The sample for the tracking test can be any sample with a very flat surface, as long as the surface is sufficient to ensure that no liquid flows out of the edge during the test. Note: Although a smaller size can be used, it is recommended that the plane size should not be less than 30mm*20mm to reduce the loss of electrolyte flowing out of the edge of the sample. The specimen thickness shall be 3mm or more, and each material specimen may be overlapped to obtain a thickness of at least 3mm. The sample size area of the high-voltage tracking test is 50mm*120mm, and the thickness is 6mm. Seven, the difference between the test voltages The voltage applied to the two electrodes in the tracking test is 100V~600V The voltage of the high-voltage tracking test is 1000V~6000V
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