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A method and system for identifying saturation of a current transformer based on the sudden change amount of a sampling value

A technology of current transformer and sudden change, which is applied in the direction of electrical components, emergency protection circuit devices, etc.

Active Publication Date: 2019-01-04
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention proposes a method and system for identifying the saturation of a current transformer based on the sudden change in the sampling value, so as to solve the problem of how to identify the saturation of the current transformer

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  • A method and system for identifying saturation of a current transformer based on the sudden change amount of a sampling value
  • A method and system for identifying saturation of a current transformer based on the sudden change amount of a sampling value
  • A method and system for identifying saturation of a current transformer based on the sudden change amount of a sampling value

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Embodiment Construction

[0065] 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.

[0066] 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 over...

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Abstract

The invention discloses a method for identifying the saturation of a current transformer based on the sudden change amount of a sampling value, which comprises the following steps: calculating the secondary side sudden change amount of three phases of each branch according to the collected secondary sampling value of each branch three phases of the bus bar at the current time, and calculating theprimary side sudden change amount of each branch three phases according to the secondary side sudden change amount; According to the absolute value of the primary side mutation of each branch, the maximum value of the primary side mutation of each phase is taken as the maximum value of the primary side mutation, and the sum of the other primary side mutation except the maximum value of the primaryside mutation of each phase is calculated as the sum of the primary side mutation of each phase. Calculate the ratio of the maximum integral of one-time side catastrophe and the sum integral of one-time side catastrophe respectively, and identify the saturation of current transformer according to the ratio of each phase. The invention improves the identification ability of the saturation condition of the current transformer, can judge whether the fault is an in-area fault or an out-area fault, and avoids the malfunction of the protection.

Description

technical field [0001] The present invention relates to the technical field of electrical technology relay protection, and more specifically, to a method and system for identifying saturation of a current transformer based on sudden changes in sampled values. Background technique [0002] The current transformer is the main primary and secondary electrical quantity transmission and transformation equipment of the power system, and is an important data source of the power secondary system. The transmission capability of the current transformer directly affects the operation performance of the power secondary system, and then affects the power primary system. safe and stable operation. At present, the widely used electromagnetic transformer will be saturated under the condition of high current, and at the same time, the geomagnetic induction and DC bias will also cause the current transformer to saturate. [0003] The reason for the saturation of the current transformer is: b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045H02H7/04
CPCH02H7/042H02H7/0455
Inventor 王兴国杜丁香郭雅蓉曹虹陈争光戴飞扬姜宏丽
Owner CHINA ELECTRIC POWER RES INST