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Current measurement equipment and current measurement system

A technology for current measurement and power equipment, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problems of unsuitable measurement of high-frequency current and low flexibility of current measurement of power equipment

Active Publication Date: 2021-03-16
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for some ungrounded power equipment or power equipment with a non-unique grounding wire at the end of the bushing (which will cause current shunting), the above method of measuring high-frequency current is not applicable, and the flexibility of current measurement of power equipment is low

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  • Current measurement equipment and current measurement system
  • Current measurement equipment and current measurement system
  • Current measurement equipment and current measurement system

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Embodiment Construction

[0026] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0027] There are various power equipment deployed in the power grid, and the safe and reliable operation of the power equipment can ensure the safe and reliable power supply of the power grid. Therefore, it is necessary to detect possible abnormalities in the operation of the power equipment.

[0028] The power transformer is a key power equipment in the power grid. The power transformer is a device used to change an AC voltage (current) of a certain value into another voltage (current) with the same frequency or several different values. By measuring the high-frequency current superimposed in the power frequency current of the power transformer, it is possible to monitor whether there are abnormalities such as lightning strikes a...

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Abstract

The invention discloses current measurement equipment and a current measurement system, and relates to the technical field of power equipment. The current measurement equipment is used for measuring ahigh-frequency current superimposed in a power frequency current of power equipment. The power equipment comprises a current-carrying conductor. The current measurement equipment comprises a first Rogowski coil, a second Rogowski coil and a resistor assembly connected between the first Rogowski coil and the second Rogowski coil in series. The first Rogowski coil comprises a high-frequency magnetic core, and the second Rogowski coil comprises a low-frequency magnetic core. When the current-carrying conductor is sleeved with the first Rogowski coil and the second Rogowski coil, a first inducedvoltage induced in the first Rogowski coil by the power frequency current in the current-carrying conductor and a second induced voltage induced in the second Rogowski coil by the power frequency current in the current-carrying conductor are equal in size, and the first induced voltage and the second induced voltage are opposite in direction. According to the current measurement equipment and thecurrent measurement system, the current measurement flexibility of the power equipment can be improved.

Description

technical field [0001] The present application relates to the technical field of power equipment, and in particular to a current measuring device and a current measuring system. Background technique [0002] There are various power equipment deployed in the power grid, and the safe and reliable operation of the power equipment can ensure the safe and reliable power supply of the power grid. Therefore, it is necessary to detect possible abnormalities in the operation of the power equipment. [0003] The power transformer is a key power equipment in the power grid. The power transformer is a device used to change an AC voltage (current) of a certain value into another voltage (current) with the same frequency or several different values. By measuring the high-frequency current superimposed in the power frequency current of the power transformer, it is possible to monitor whether there are abnormalities such as lightning strikes and overvoltages in the power transformer. In th...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/0092G01R15/181G01R15/186
Inventor 吴旭涛周秀李秀广何宁辉田天罗艳马云龙牛勃汲胜昌周童浩庄哲
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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