Brief Introduction Of Triple Frequency Induction Voltage Withstand Device

ZXSBFinduction voltage withstand test deviceis a device used to assess the main and secondary insulation strength of the transformer. It is widely used in the AC voltage withstand test of 36-220kV series excitation voltage transformer in the power system. It can also conduct induction test on the winding of the motor and small transformer, and can also be used as the 150Hz power supply for short-time operation. This paper gives a brief description of the triple frequency induction voltage withstand device.

According to the test standard of national electrical test equipment, the requirements of power system for high-voltage transformer frequency doubling induction withstand voltage test equipment are considered. As we all know, under the rated frequency and voltage, the core of transformer is close to saturation. If the power frequency power supply is used to apply the test voltage greater than the rated voltage on both ends of the tested transformer winding, the no-load excitation current will increase sharply to an unacceptable degree. From the relationship of induced potential, it can be seen that in order to apply the test voltage greater than the rated voltage without making iron. If the core is saturated, the method of increasing the power frequency can be adopted, and the power generator larger than the frequency doubling must be used. ZXSBF induction withstand voltage test device is simple in operation, reliable in performance, and can meet the needs of induction withstand voltage of transformer and mutual inductor.

However, the variable-frequency generator set is bulky and inconvenient for transportation, which is not suitable for field use. When the capacity is small, the waveform is not very good. Three three-phase transformers can be connected into an open triangle to obtain a 150Hz power supply. The DNA waveform and capacity will change with the load, and it is very easy to occur in the resonance of the test object, resulting in resonance overvoltage and damaging the test object.

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