Double-frequency adaptive switching broadband dielectric excitation high-voltage power supply

Abstract

The invention discloses a double-frequency adaptive switching broadband dielectric excitation high-voltage power supply. The double-frequency adaptive switching broadband dielectric excitation high-voltage power supply comprises a power supply frequency switching circuit, a first frequency band output module and a second frequency band output module; the two output ends of the power supply frequency switching circuit are connected to the first frequency band output module and the second frequency band output module respectively; when the frequency of the input power supply is in the first frequency band or the second frequency band, the first frequency band output module or the second frequency band output module is controlled to be started separately; the first frequency band output module comprises a first rectification filter circuit, wherein the output end of the first rectification filter circuit is connected to a load through a voltage regulation circuit 1, a multi-field-effect tube synchronous series modulation circuit and a filter circuit 1 in sequence; the output end of the voltage regulation circuit 1 is also connected to the control end of the voltage regulation circuit1 through a control driving circuit 3; and the control end of the multi-field-effect tube synchronous series modulation circuit is connected to a multi-stage high-synchronous modulation control driving circuit. According to the high-voltage power supply, high-voltage power supply output can be realized, the anti-interference capability is high, and the field test accuracy is improved.

Description

technical field [0001] The invention belongs to the field of transformer insulation state evaluation, and in particular relates to a dual-frequency self-adaptive switching broadband dielectric excitation high-voltage power supply. Background technique [0002] As the core equipment of the power supply system, the transformer undertakes the task of voltage conversion, and its insulation performance directly affects the safe and stable operation of the transformer. The frequency-domain dielectric spectrum method is a non-destructive and effective test method for evaluating the transformer insulation state. Its principle is to apply sinusoidal AC voltages of different frequencies to the main insulation of the traction transformer to measure its dielectric constant. According to the characteristics of its dielectric constant The information required for analysis has the advantages of rich information. However, the output voltage of the existing frequency-domain dielectric spect...

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Problems solved by technology

However, the output voltage of the existing frequency-domain dielectric spectrum testing system is low, and the current signal is weak when applied to transformer field testing, which is easily affected by external interference. It is difficult to accurately test the frequency-domain dielectric spectrum curve of the transformer, resulting in incorrect diagnosis results of the transformer insulation state.

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