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Working principle of high voltage test transformer

time:2021/7/21   source:华天电力  reading:261 time

Working principle of high voltage test transformer


1. AC, AC and DC test transformers:


Input the industrial frequency power supply into the operation box (or console), adjust the voltage through the auto-voltage regulator and input it to the primary winding of the test transformer. According to the principle of electromagnetic induction, power frequency high voltage can be obtained in the secondary (high voltage) winding. After the power frequency high voltage is rectified and filtered by the high voltage silicon stack, the DC high voltage can be obtained, and its amplitude is 1.4 times the effective value of the power frequency high voltage. It's just that the short-circuit bar should be drawn out when using DC, and the short-circuit bar should be inserted when using AC.


Hipot Test Set.png


2.Tap test transformer:


In order to satisfy the contradiction between a transformer with a higher voltage and a lower voltage and a lower current and a higher current, the high-voltage winding is divided into two windings, one is the winding with the larger current, the other is the winding with the smaller current, and then Two windings are connected in series and lead out separately, schematic diagram of the principle


3. Cascade test transformer:


In order to obtain a higher voltage test transformer, a cascade method can also be used to obtain a higher voltage. Figure 2 shows the principle wiring diagram of a three-stage cascade test transformer. The relationship between the capacity and voltage of the three transformers satisfies: P1=2P2=3P3, U(total)=1U+2U+3U.


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