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A Method for Identification of Current Transformer Saturation

A technology of current transformers and identification methods, which is applied in the direction of electrical components, circuit devices, emergency protection circuit devices, etc., can solve problems such as differential refusal and current differential protection misoperation, so as to avoid refusal and misoperation , the effect of improving motion performance

Active Publication Date: 2018-09-14
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0003] Current transformer saturation includes two parts: the identification of current transformer saturation and the open criterion for faults occurring during saturation. For the former, if the current transformer cannot be accurately identified, it will cause misoperation of the current differential protection. For the latter, the current transformer saturation Failure occurs during the period, which will cause differential rejection

Method used

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  • A Method for Identification of Current Transformer Saturation
  • A Method for Identification of Current Transformer Saturation
  • A Method for Identification of Current Transformer Saturation

Examples

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Embodiment 1

[0052] The invention of this example provides a method for identifying the saturation of a current transformer, comprising the following steps:

[0053] (1) Data processing

[0054] Acquire the three-phase current required for current differential protection

[0055] For double-ended quantities (I 1i , I 2i ), where one side takes I 1i , the other side takes I 2i .

[0056] For multi-sided quantities, converts multi-sided to two-sided. For each sampling point, first find the side with the largest absolute value of the sudden change of current among the multiple sides, and set the side with the largest absolute value of the sudden change of current as one side, and set the current sum of the other sides as the other side. They are named M and Σ-M respectively, and are often used as the subscript of current. Note that we are judging by phase, for example, at the L terminal, find the current with the largest absolute value of the current mutation among the L phase curren...

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Abstract

The invention relates to a current transformer saturation identification method comprising the following steps: acquiring three-phase current data needed for current differential protection and preprocessing the data; setting a current transformer saturation identification plane and partitioning the current transformer saturation identification plane; identifying whether a current transformer is saturated or not according to the data and the saturation identification plane; and reopening the fault in the saturated period of the current transformer according to the saturation recognition judgment and the fault opening criterion. By adopting the technical scheme, the action performance of current differential protection is enhanced.

Description

Technical field: [0001] The invention relates to the field of relay protection of power systems, and more particularly relates to a method for identifying saturation of a current transformer. Background technique: [0002] Current differential protection, as the main protection of electrical components, is widely used in power systems. The operating performance of current transformers directly affects the operating performance of current differential protection. When the current transformer is saturated, when the primary current is transferred to the secondary, The current waveform will be distorted, causing differential protection to malfunction, so for current differential protection, accurate identification of current transformer saturation is of great significance. [0003] Current transformer saturation includes two parts: the identification of current transformer saturation and the open criterion for faults occurring during saturation. For the former, if the current tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/26
Inventor 柳焕章周泽昕王兴国杜丁香郭雅蓉李锋
Owner CHINA ELECTRIC POWER RES INST
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