A system for expanding the lower limit frequency of capacitive sensors for non-contact measurement

A technology of capacitive sensor and measurement cable, which is 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: 2017-06-30
XI AN JIAOTONG UNIV
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  • Abstract
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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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  • A system for expanding the lower limit frequency of capacitive sensors for non-contact measurement
  • A system for expanding the lower limit frequency of capacitive sensors for non-contact measurement
  • A system for expanding the lower limit frequency of capacitive sensors for non-contact measurement

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Embodiment Construction

[0019] see Figure 1 to Figure 5 , the present invention is achieved through the following technical solutions.

[0020] in one embodiment

[0021] The capacitive sensor system of the present invention is made up of capacitive sensor, frequency band extender, wherein:

[0022] The capacitive sensor is used to convert the high-voltage signal of the transformer coil into a low-voltage signal through the principle of capacitive voltage division;

[0023] One end of the frequency band expander is connected to the capacitive 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.

[0024] in another embodiment

[0025] The capacitive sensor is a chip-type capacitive sensor, and the chip-type capacitive sensor is composed of a sensing electrode, an insulating film and a BNC connector, and the periphery of the chip-type capacitive sensor is wrapped with a metal shell; the middle of the BNC co...

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Abstract

The invention discloses a lower limit frequency expansion system of a capacitive sensor for non-contact measurement of the transient process of a transformer coil. The system includes a chip capacitance sensor, a frequency band expander, a measurement cable, an RC compensation matching circuit and a measurement system output port. The SMD capacitive sensor uses the principle of capacitive voltage division to sense the voltage signal of the transformer coil turns, and converts the high voltage signal into a low voltage signal. The frequency band expander realizes the expansion of the lower limit frequency of the capacitive sensor by increasing the input impedance of the measurement system. The RC compensation matching circuit can improve the high-frequency characteristics of the measurement system. After the expansion of the lower limit frequency, the capacitive sensor can measure the power frequency voltage and long-wave tail pulse voltage in the winding.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of power transformer transient voltage measurement, and in particular relates to a lower limit frequency expansion system of a capacitive sensor for non-contact measurement. [0003] Background technique: [0004] At present, the measurement method of the transient process of the power transformer 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-intervention measurement of the transient process of the transformer coil. The measurement lower limit frequency of the capacitive sensor measurement method itself is often hundreds of Hz. It is difficult to measure the power frequency voltage and long wave tail operating overvoltage in the transformer coil with this measurement method. Therefore, it is necessary to expand the lower limit frequency of the capacitive sensor measur...

Claims

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Application Information

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Patent Type & Authority Patents(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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