The difference between test transformer and ordinary power transformer
The power frequency AC high voltage test transformer is referred to as the test transformer for short. It has good electrical insulation performance. It is generally widely used in the insulation performance test of electrical equipment and electrical materials, but it can also be used as a low-power high-voltage power supply. The test transformer is generally a step-up transformer. This kind of test transformer uses the high-frequency voltage induced by its secondary side to conduct insulation performance tests on various electrical products and insulating materials. After leaving the factory, handing over or overhauling electrical equipment, an AC withstand voltage test shall be carried out to actually assess the insulation level of the equipment insulation against overvoltage. Therefore, no matter in the high-voltage laboratory or test site of the manufacturing department, the operation department, there should be AC withstand voltage equipment. You can check the samples at this point.
The test transformer is an indispensable electrical equipment for withstand voltage test in the repair of motors, transformers, and electrical products. Test transformers are mainly used for power frequency withstand voltage test, partial discharge measurement, thermal stability test of insulating medium, etc.; for medium and high frequency electrical equipment, special frequency test transformers can also be used for withstand voltage test and related electrical parameters Measurement.
The principle of the test transformer is the same as that of the ordinary power transformer. The difference is that the test transformer has a high working voltage, short service time, small temperature rise, and generally does not have a radiator. In addition, the load of the test transformer is small, and mostly capacitive load. The capacity of the test transformer is relatively smaller than the capacity of the power transformer.
AC high-voltage test transformers are the same in principle as power transformers, but due to the different operating conditions between the two, what are the characteristics of AC high-voltage test transformers and power transformers in the design and use?
(1) AC high-voltage test transformers are single-phase, while power transformers are generally three-phase.
(2) The output of AC high voltage test transformer is high voltage, small current, and small capacity; while power transformers generally have large capacity.
(3) The AC high voltage test transformer has a small insulation margin and the working mode is intermittent; while the power transformer has a large insulation margin and the working mode is continuous.
(4) The AC high-voltage test transformer should be able to withstand the test of multiple discharges.
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