A non-grounded voltage measuring device and method

A voltage measurement, non-grounded technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of large volume, complex insulation structure, and difficulty in adapting to the development needs of smart grids, etc. The effect of less components and easy assembly and disassembly

Active Publication Date: 2022-04-12
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, traditional electromagnetic voltage transformers and capacitive voltage transformers have disadvantages such as large volume and complex insulation structure, and it is gradually difficult to adapt to the development needs of smart grids.

Method used

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  • A non-grounded voltage measuring device and method
  • A non-grounded voltage measuring device and method
  • A non-grounded voltage measuring device and method

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Embodiment Construction

[0038] The core of the present invention is to provide a non-grounded voltage measuring device and method, which uses a virtual ground for voltage measurement and calculation without the need for insulation design; moreover, the measuring device of the present application uses fewer components, is smaller in size, and is easy to assemble and disassemble , High construction safety, which can meet the development needs of smart grid.

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the a...

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Abstract

The invention discloses a non-ground voltage measuring device and method. By placing a metal plate between the wire to be measured and a virtual ground, the voltage of the wire to be measured is compared with the equivalent capacitance of the wire to be measured and the virtual ground of the metal plate. The corresponding relationship is established, and then the voltage signal representing the corresponding relationship is modulated by a high-frequency signal and frequency-divided to calculate the voltage of the wire to be tested. It can be seen that the measuring device of the present application uses a virtual ground for voltage measurement and calculation without the need for insulation design; moreover, the measuring device of the present application uses fewer devices, is smaller in size, is easy to assemble and disassemble, and has higher construction safety, thereby meeting the requirements of The development needs of smart grid.

Description

technical field [0001] The invention relates to the technical field of power measurement, in particular to a non-grounded voltage measurement device and method. Background technique [0002] Voltage signal parameters are key parameters for metering, fault detection, and relay protection in power systems. At present, in power systems, grounded voltage transformers (such as electromagnetic voltage transformers, capacitive voltage transformers) are usually used to isolate and reduce the voltage to a low-voltage range that can be directly measured, and then obtain voltage parameters through measuring devices. However, both traditional electromagnetic voltage transformers and capacitive voltage transformers have disadvantages such as large volume and complex insulation structure, and it is gradually difficult to adapt to the development needs of smart grids. [0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
CPCG01R19/2503G01R19/2506
Inventor 许爱东李鹏李立浧王志明吴质冰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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