Features of a surge tester
In today’s market, there are many winding materials (especially with low resistance) available, which help reduce waste heat that results from excessive heating. These winding materials are essential in instruments such as rotors, stators, input filters, high voltage chokes, transformers, AC and DC motors, etc. Frequent maintenance or repair of these items is necessary or else they will eventually cause them to fail electrically or mechanically.
If you are someone who is looking for a complete solution for this, then surge testing (a comprehensive maintenance program) can definitely offer you a helping hand as it will reduce any unexpected electrical failure due to turn by turn and phase to – phase short circuit. The device that has been used to detect such weaknesses of these products is known as a surge tester or impulse winding tester. Hell! With this tester, we can now retrieve the winding quality information and it uses the impedance balancing principle to check the winding quality. With this tester, anyone can perform resistance test and high voltage test.
Features of this surge tester:
- Electrical and mechanical failures can occur in motors due to a short circuit that has resulted from a breakdown of the winding insulation. Deteriorated insulation is the first sign that causes electrical failure in motors. Whereas, the secondary insulation could withstand the wear and tear and short circuits that generally occur before they cause the insulation destruction of the thicker earth wall. Therefore, the surge test is a non-destructive test, by which the detection of the early stages of deterioration of the secondary insulation is possible.
- Three types of insulation faults can occur and these are, turn-by-turn insulation fault, phase-to-phase insulation fault, earth wall insulation fault, and stresses (may be thermal stresses, different coefficients of expansion, weakening varnish due to high temperatures and magnetic force due to winding currents, other external factors such as humidity, heat, etc.). Due to certain types of voltages, when applied to the motor winding, it can cause electrical insulation failure.
- Special tests such as resistance, inductance, impulse voltage, partial discharges, spectrum analysis and safety tests are carried out to check the weaknesses found in the windings.
This tester can detect insulation faults such as inter-turn shorts, winding shorts, coil-to-coil shorts, phase-to-phase shorts, and layer-to-layer shorts. The other benefits of this tester are open circuit and ground detection, and also checking the resistance of the ground insulation, which consists of enameled insulation. A digital surge tester is also available, where you can store the coil waveform in memory (digitally), while testing, the stored waveform is called and can be compared with the waveform of the coil to be tested.