Series-resonance voltage-withstanding partial discharge test device adopting fixed duty ratio square wave frequency conversion power supply

A series resonance withstand voltage, variable frequency power supply technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems affecting the accuracy and reliability of the measurement, low power efficiency, burr interference of switching tubes, etc., and achieve failure. Easy and accurate positioning, improved reliability and accuracy, improved noise reduction effect

Pending Publication Date: 2017-12-29
上海格鲁布科技有限公司
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Problems solved by technology

But for partial discharge measurement, the boost source must be non-interfering, otherwise it will affect the accuracy and reliability of the measurement. For this reason, most current partial discharge tests use linear power amplifier mode without partial discharge variable frequency power supply, but The power supply is not suitable for low efficiency, hig

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  • Series-resonance voltage-withstanding partial discharge test device adopting fixed duty ratio square wave frequency conversion power supply
  • Series-resonance voltage-withstanding partial discharge test device adopting fixed duty ratio square wave frequency conversion power supply

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Embodiment Construction

[0014] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0015] Such as Figure 1-2 As shown, a series resonant voltage withstand partial discharge test device using a fixed duty ratio square wave variable frequency power supply includes a 1:1 fixed duty ratio square wave variable frequency power supply (1), which is adjusted by an excitation transformer (2) to adjust the voltage to Applied to the test cable (6), the test cable (6) is connected in parallel with a partial discharge collector (5) for collecting partial discharge signals, and the partial discharge signals are transmitted to the partial discharge analysis system (3) for analysis; The switching point of the changeover switch of the 1:1 fixed duty ratio square wave frequency conversion power supply (1) is kept ...

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Abstract

The invention relates to a series resonance withstand voltage partial discharge test device using a square wave variable frequency power supply with a fixed duty ratio, including a 1:1 fixed duty ratio square wave variable frequency power supply, which is regulated by an excitation transformer and then applies the voltage to the cable of the test product , the sample cable is connected in parallel with a partial discharge collector for collecting partial discharge signals, and the partial discharge signals are transmitted to the partial discharge analysis system for analysis. This position is the voltage zero point of the output sine wave, which can be completely shielded during partial discharge measurement without affecting the measurement results. The PD signal can be collected continuously during AC withstand voltage, which improves the reliability and accuracy of the PD measurement signal. The continuous acquisition can also greatly improve the noise reduction effect of the PD signal, making the fault location of the PD point easier and more accurate.

Description

technical field [0001] The invention relates to the field of electric devices, in particular to a series resonance withstand voltage partial discharge test device using a square wave frequency conversion power supply with a fixed duty ratio. Background technique [0002] Before the power line is handed over and put into operation or after maintenance, it must be inspected and evaluated for its insulation state. Among them, the AC withstand voltage test is a must-do test, and the partial discharge measurement is developed in recent years. A more advanced detection method for early diagnosis and development trend prediction function. [0003] There are generally three boosting methods for the withstand voltage test: external application method, multi-frequency induction method and series resonance method. The series resonance method is to use the reactor and the test object to form an LC resonant circuit, and make the test circuit reach the resonance state through frequency m...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 沈道义陆正弦干元锋胡勇赵洪义
Owner 上海格鲁布科技有限公司
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