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A method and system for evaluating the residual magnetism of a current transformer for metering

A current transformer and residual magnetism technology, which is applied in the field of evaluating the residual magnetism of current transformers for measurement, to achieve the effect of improving scientificity and high economic benefits

Active Publication Date: 2021-08-17
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical solution of the present invention provides a method and system for evaluating the residual magnetism of the current transformer for metering, so as to solve the problem of how to evaluate the residual magnetism of the current transformer for metering

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  • A method and system for evaluating the residual magnetism of a current transformer for metering
  • A method and system for evaluating the residual magnetism of a current transformer for metering
  • A method and system for evaluating the residual magnetism of a current transformer for metering

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Embodiment Construction

[0055]Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0056] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overl...

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Abstract

The invention discloses a method for evaluating the residual magnetism of a current transformer for measurement. The method includes: obtaining the current end angle and the effective value of the short-circuit current when a short-circuit fault occurs according to the secondary wave recording diagram of the transmission line; The basic magnetization curve obtains the flux value at the saturation flux point and the voltage value at the saturation voltage point; obtains the remanence coefficient of the current transformer and the impedance of the secondary load in advance; according to the current end angle, the effective value of the short-circuit current, and the saturation flux The magnetic flux value of the point, the voltage value of the saturation voltage point, the remanence coefficient of the current transformer, and the impedance of the secondary load, respectively calculate the remanence of the current transformer of each phase in the three phases; respectively calculate the three-phase current mutual inductance The remanence weight coefficient of the transformer; according to the remanence of the three-phase current transformer and the weight coefficient of the remanence of the three-phase current transformer, the remanence of the current transformer is calculated.

Description

technical field [0001] The invention relates to the technical field of power metering, and more specifically, to a method and system for evaluating the residual magnetism of a current transformer for metering. Background technique [0002] The current transformer is an important primary device in the power system. It can convert the high-current and high-voltage electrical signals on the primary side into small current and low-voltage signals and transmit them to the secondary side. It plays an important role in the stable operation of the power system. Current transformers can be divided into current transformers for protection and current transformers for metering according to their uses. The main functions of circuit transformers for metering are to monitor the power grid and measure electricity. When a short-circuit fault occurs in the grid line, a strong short-circuit current will pass through the line transiently. The instantaneous value of the short-circuit current ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12
CPCG01R33/12
Inventor 姚腾王欢项琼王雪赵威杨洪徐晨吴良科彭淑华
Owner CHINA ELECTRIC POWER RES INST
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