Transformer winding direct current resistance back electromotive force suppression circuit

Abstract

The invention discloses a transformer winding direct current resistance back electromotive force suppression circuit which comprises a constant current source, a switching device, a bidirectional capacitance energy storage circuit, a constant current source discharge circuit and a discharge tube. The bidirectional capacitance energy storage circuit, the constant current source discharge circuit and the discharge tube are used for being sequentially connected to the two ends of a transformer winding in parallel. The positive electrode of the constant current source is connected with one end of the transformer winding through the switching device, and the negative electrode of the constant current source is common-grounded with the other end of the transformer winding. According to the invention, a three-layer suppression circuit design composed of a bidirectional capacitance energy storage circuit, a constant current source discharge circuit and a discharge tube is adopted, and the bidirectional capacitance energy storage circuit is used for carrying out temporary energy storage discharge on forward and reverse counter electromotive forces of a transformer winding, so that damping oscillation generated by the forward and reverse counter electromotive forces is suppressed; and the constant current source discharge circuit is used for thoroughly and stably discharging, so that the back electromotive force of the direct-current resistance of the transformer can be effectively inhibited, and the safe operation of the direct-current resistance tester is ensured.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a transformer winding direct current resistance counter electromotive force suppression circuit. Background technique [0002] The transformer is the most important part of the power system. The role of the transformer is various. It can not only reduce the loss of electric energy during the transmission process by increasing the voltage, but also reduce it to various levels of voltage to meet the electricity demand. Substations need to use many different types of transformers to meet the normal operation of the grid. The operating state of the transformer determines the safety and stability of the national power grid to a certain extent, especially for large transformers with high cost and complex process, its reliability is even more important. In order to prevent the occurrence of major transformer accidents, "DL / T596-2015 Power Equipment Preventive Test Regulatio...

AI Technical Summary

Problems solved by technology

When the capacity of the transformer is larger, the inductance of the winding is also larger, thereby generating a huge back electromotive force, which cannot be completely released in one cycle, but reversely charges the winding inductance, making the damped oscillation unable to be positively suppressed, and will As a result, the internal control constant current MOS tube of the DC resistance tester will break down, and the freewheeling diode will also burn out, causing the DC resistance tester to easily burn the instrument

It can be seen that the traditional scheme cannot effectively suppress the back electromotive force of the DC resistance of the transformer, and cannot guarantee the safe operation of the DC resistance tester.

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