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DC resistance test is a must-test item for semi-finished products, finished products factory test, installation, handover test and preventive test of power sector in the manufacture of inductive coils such as transformers, mutual inductors, reactors, electromagnetic operating mechanisms, etc. It can effectively discover the selection and welding of inductive coils, Loose connection parts, missing strands, broken wires and other manufacturing defects and hidden dangers after operation. It is also an essential test item for transformers after handover, overhaul and change of tap changer. At the same time, similar to dry-type transformers and amorphous alloy transformers, since the low-voltage coils are wound with copper foil, the resistance value is extremely low, which brings high precision and resolution requirements to the test. Under normal circumstances, testing the DC resistance of transformer windings and high-power inductive devices by traditional methods (bridge method and voltage drop method) is a time-consuming and labor-intensive task. In order to meet the needs of fast testing of inductive coil DC resistance, improve the test accuracy of DC resistance, shorten the test time and reduce the testing burden of testers, this DC resistance tester has been developed. The maximum output current range of EPWT-10B is designed to be 10A, which solves the problem of low-value resistance testing. At the same time, for high-resistance samples such as transformers, the meter also extends the DC resistance test range to 1MΩ, which is an ideal device for testing the DC resistance of transformer windings and high-power inductive equipment.
The EPWT-10B Transformer Winding Resistance Tester also adopts 5.6-inch color LCD display, simple and beautiful operation interface, built-in rechargeable lithium battery and charging circuit, with high-speed microcontroller as the core, combined with high-speed A/D converter and program-controlled current source technology, with resistance temperature conversion function , In circuit design, it has a variety of protection functions such as back EMF protection, disconnection protection, power failure protection, and overheating alarm. In order to achieve high-precision, high-stability, high-speed testing, it also has the characteristics of self-test, automatic discharge, large output current, wide range, strong anti-interference ability, fast charging and discharging speed, data analysis and processing, and discharge indication.
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