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In today’s market, there are many winding materials (especially with low resistance) available, which help to reduce waste heat that result from excess heating. These winding materials are essential in instruments like rotors, stators, input filter, high voltage choke, transformers, AC- and DC- motors, etc. Frequent maintenance or repair of these items are necessary or else will eventually cause these to fail either electrically or mechanically.
If you are someone, who’s in search of a complete solution for this then, surge testing (a comprehensive maintenance program) can definitely offers you a helping hand as it will reduce any unexpected electrical failures due to turn-to-turn and phase-to-phase shorting. The device that has been used to detect such debilities of these goods is known as surge tester or impulse winding tester. Heck! With this tester, we are now able to retrieve the information regarding quality of the winding and it uses the principle of impedance balance to check the winding’s quality. With this tester, anyone can do resistance test and high-voltage test.
Features of this surge tester:
- Electrical and mechanical failures can occur in motors due to shorting that has resulted by a breakdown of winding insulation. Deterioration of insulation is the first sign that causes electrical failure in motors. Whereas, secondary insulation would be able to sustain wearing and shorting that usually occur before it leads to destruct thicker, ground wall insulation. Thereby, surge testing is a non-destructive test, by which the detection of the early stages of secondary insulation deterioration is possible.
- Three types of insulation failures can occur and these are, turn to turn insulation failure, phase to phase insulation failure, ground wall insulation failure, and stresses (it can be thermal stresses, different coefficients of expansion, varnish weakening due to high temperatures, and magnetic force due to winding currents, other external factors, like moisture, heat etc.). Due to certain types of stresses when applied to the motor winding may lead to electrical failure of the insulation.
- Special tests such as resistance, inductance, impulse voltage, partial discharge, spectrum analysis and safety tests are done to check the debilities that are found in the winding goods.
Insulation failures such as turn to turn shorts, winding to winding shorts, coil to coil shorts, phase to phase shorts, and layer to layer shorts could be detected by this tester. The other benefits of this tester are the open circuit and ground detection, and also checking the ground insulation strength, which consists of enameled insulation. There also available digital surge tester, where you can store the wave form of the coils in the memory (digitally), while testing, the stored waveform is called and could be compared with the waveform of the coil to be tested.
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