The 0.1Hz ultra-low frequency high voltage generator is a new type of ultra-low frequency AC test device that uses sine wave or cosine square wave as the output source. For the non-destructive insulation withstand voltage test of power cables, what are the advantages of the application of the 0.1Hz ultra-low frequency high voltage generator?
1. Effectively detect end insulation defects
Under the condition of applying the same voltage, the 0.1Hz ultra-low frequency withstand voltage test device produces a smaller voltage drop on the generator bar than the traditional power frequency withstand voltage test device, so it can expand the pressure range and make it easier to find the generator Insulation defect.
2. Reduce damage to the anti-corona layer at the end of the stator winding
Compared with the traditional power frequency withstand voltage test device, the 0.1Hz ultra-low frequency withstand voltage test device produces a smaller capacitive current during the withstand voltage test, and the electric energy generated in the corona layer is also smaller, thereby reducing the impact on the stator winding. Damage to the end anti-corona layer.
3. Reduce the insulation damage of the generator
During the ultra-low frequency withstand voltage test, the amount of discharge generated locally by the generator is very small, about 1/3750 of that in the power frequency withstand voltage test, and the degree of insulation damage to the generator is significantly reduced. If the insulation layer of the generator is weak, it may be further encountered during the power frequency withstand voltage test, which will eventually lead to insulation within a year or two, which will bury hidden dangers for the safe operation of the generator. The ultra-low frequency withstand voltage test device can better protect the insulation layer of the generator, thereby prolonging the service life of the generator and reducing the probability of accidents of the generator.
4. Small quality, small size, convenient transportation and use
When the 0.1Hz ultra-low frequency high voltage generator adopts the traditional power frequency withstand voltage technology to detect the insulation defect of the generator part and the groove part, due to the volume and quality reasons, at least one large truck and one vehicle are required during the transportation of the test equipment crane. In contrast, the ultra-low frequency withstand voltage test equipment is of low quality (about 1/500 of the power frequency withstand voltage test equipment), small in size, saves a lot of manpower and material resources, and is very convenient to transport and use