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Lower limit frequency expansion system for non-contact measurement capacitive sensor

A technology of capacitive sensor and measurement cable, applied in the direction of changing the range circuit, etc., can solve the problems of difficulty in measuring the power frequency voltage of the transformer coil and the overvoltage of the long-wave tail operation, and achieve the effect of increasing the time constant and expanding the lower limit frequency.

Active Publication Date: 2015-01-07
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to measure the power frequency voltage and long wave tail operating overvoltage in the transformer coil with this measurement method

Method used

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  • Lower limit frequency expansion system for non-contact measurement capacitive sensor
  • Lower limit frequency expansion system for non-contact measurement capacitive sensor
  • Lower limit frequency expansion system for non-contact measurement capacitive sensor

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Embodiment Construction

[0014] See Figure 1 to Figure 5 The present invention is realized through the following technical solutions.

[0015] In one embodiment

[0016] The capacitive sensor system of the present invention is composed of a capacitive sensor and a frequency band extender, among which:

[0017] The capacitance sensor is used to convert the high voltage signal of the transformer coil into a low voltage signal through the principle of capacitance voltage division;

[0018] One end of the frequency band expander is connected with the capacitance sensor, and the frequency band expander is used to increase the input impedance of the system and expand the lower limit frequency of the sensor.

[0019] In another embodiment

[0020] The capacitance sensor is a patch type capacitance sensor, the patch type capacitance sensor is composed of a sensing electrode, an insulating film and a BNC connector, the patch type capacitance sensor is surrounded by a metal shell; the middle of the BNC connector is a me...

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PUM

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Abstract

The invention discloses a lower limit frequency expansion system for a non-contact measurement capacitive sensor. The lower limit frequency expansion system comprises an SMD capacitive sensor, a frequency band expansion device, a measurement cable, an RC compensation match circuit and a measuring system output port. The SMD capacitive sensor senses a voltage signal of a transformer coil wire turn according to the capacitive voltage division principle, and converts the high voltage signal into a low voltage signal. The frequency band expansion device increases the input impedance of a measuring system to expand the lower limit frequency of the capacitive sensor. The RC compensation match circuit can improve the high frequency characteristic of the measuring system. The capacitive sensor with the expanded lower limit frequency can be used for measuring power frequency voltage and long wave tail impulse voltage inside a coil.

Description

Technical field: [0001] The invention belongs to the technical field of power transformer transient voltage measurement, and particularly relates to a lower limit frequency expansion system of a capacitance sensor for non-contact measurement. Background technique: [0002] The measurement method of the transient process of power transformers currently mostly adopts the direct method, which needs to destroy the insulation structure of the winding. The non-contact measurement method using the capacitive sensor can realize the non-interventional measurement of the transient process of the transformer coil. The lower limit frequency of the capacitance sensor measurement method itself is often 100 Hz. It is difficult to measure the power frequency voltage and the long-wave tail operating overvoltage in the transformer coil with this measurement method. Therefore, it is necessary to extend the lower limit frequency of the capacitance sensor measurement method to realize the wide-band...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/08
Inventor 张乔根王同磊王喆李少斌倪鹤立
Owner XI AN JIAOTONG UNIV
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