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High-precision magnetic modulation type direct current measuring method

A DC current and magnetic modulation technology, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as nonlinear errors in DC current measurement results, and achieve the goal of improving measurement accuracy and eliminating nonlinear errors. Effect

Inactive Publication Date: 2015-02-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The magnetic permeability μ has a nonlinear relationship with the magnetic field strength H, resulting in a nonlinear relationship between the inductance L and the measured DC current I, so the measurement result of the DC current has a nonlinear error

Method used

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  • High-precision magnetic modulation type direct current measuring method
  • High-precision magnetic modulation type direct current measuring method
  • High-precision magnetic modulation type direct current measuring method

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Embodiment Construction

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] The present invention proposes a measurement method, which can make the inductance L and the measured DC current I have a linear relationship, thereby eliminating nonlinear errors and improving measurement accuracy. The high-precision magnetic modulation type DC current measurement method provided by the present invention, specifically:

[0021] First determine the measuring coil, and measure the magnetic flux of the measuring coil, the cross-sectional a...

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Abstract

The invention provides a high-precision magnetic modulation type direct current measuring method. By means of the measuring method, the magnetic flux of a measured coil, the cross section area, the magnetic induction intensity or magnetic flux density of the coil and the magnetic conductivity of annular skeleton magnetic materials are measured. Phi is set to be the magnetic flux of one turn of coil, Psi=Nphi is set to be the total magnetic flux of N turns of coils, S is set to be the cross section area of the coil, B is set to be the magnetic induction intensity or magnetic flux density and mu is set to be the magnetic conductivity of the annular skeleton magnetic materials, a segment of working section is selected in a mu-H curve of the magnetic core material through a formula by selecting configuration parameters, and the inductance of the measured coil and the measured direct current are made to form a linear relation. The non-contact direct current transformer is used to conduct measuring. By means of the high-precision magnetic modulation type direct current measuring method, the linear relation between the magnetic core inductance value and the measured direct current can be achieved, so that the moment for reaching the reference voltage and the measured direct current are made from the linear relation, the nonlinear errors in the existing direct current measuring result are eliminated, and measuring accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of leakage protection and fault detection of DC power supply, and more specifically relates to a high-precision magnetic modulation type DC current measurement method. Background technique [0002] Under the pattern of ultra-high voltage, large power grid, large capacity, automation, and intelligence, large-scale power systems are the development direction of various countries today. Ensuring the safe and reliable operation of the power system and eliminating the occurrence of large-scale accidents is a problem that needs to be focused on. [0003] The DC power supply system provides basic power for the operating equipment, control and protection equipment and signal monitoring equipment of the power system. After a long period of operation of the DC system, due to weather reasons such as humidity and rain and various human factors, the insulation drops, which has become a hidden danger to the safe operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 胡正伟谢志远裴兆鹏王力崇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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