Transformer test transformers are also often referred to as high-voltage test transformers



The "transformer test transformer" you mentioned is commonly known in the power industry as a test transformer (also often called a high-voltage test transformer, voltage booster, or withstand voltage tester).

Although its name includes "transformer" and its working principle is based on electromagnetic induction, it is fundamentally different from the ordinary power transformers we see daily in substations and distribution rooms. Simply put, power transformers are used to "work" (transmit electrical energy), while test transformers are used for "physical examination" (testing the insulation strength of equipment).

The following is a summary of the core knowledge about test transformers:

⚡ Core Function and Working Principle

Core Function: Specifically used to conduct power frequency withstand voltage tests and DC withstand voltage tests on various high-voltage electrical equipment (such as cables, instrument transformers, circuit breakers, insulating materials, etc.). By outputting extremely high voltage, it assesses the insulation level of the test object, discovers insulation defects, and measures its ability to withstand overvoltage.

Working Principle: Connect the power frequency power supply (220V or 380V) to the matching control box, and after adjustment by the auto-transformer, input it to the primary winding of the test transformer. According to the principle of electromagnetic induction, the required power frequency high voltage can be obtained at the secondary (high-voltage) winding. If DC high voltage is needed, simply connect a high-voltage silicon stack at the high-voltage output end for rectification and filtering.