Discrimination method and processing method of current sampling inconsistency in relay protection device

A relay protection device and current sampling technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as inconsistency in current sampling in relay protection devices, so as to facilitate the reasons for inconsistency in current sampling, clear logic levels, Effects that are easy to analyze

Active Publication Date: 2020-12-29
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method for judging the inconsistency of current sampling in a relay protection device and a processing method, so as to solve a plurality of defects or one of the defects in the prior art

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  • Discrimination method and processing method of current sampling inconsistency in relay protection device
  • Discrimination method and processing method of current sampling inconsistency in relay protection device

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0040] Such as figure 1 As shown, the method for discriminating the inconsistency of current sampling in the relay protection device provided by the embodiment of the present invention includes the steps: first, the relay protection device respectively collects the current analog quantities of each channel through two CPUs, interacts data through the high-speed bus, and discriminates channel by channel ;Assume that two CPUs collect the effective values ​​of the fundamental waves of a certain channel current as I1 and I2 respectively. When the maximum value of I1 and I2 is greater than or equal to the set value judgment threshold, it is judged as a large value, otherwise it is a small value. ; F...

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Abstract

The invention discloses a current sampling inconsistency discriminating method and a processing method in a relay protection device. The discriminating method comprises the following steps of: acquiring a current analog double CPU sampling value of a tested channel in a relay protection device; respectively calculating a fundamental wave effective value of each cycle of the double CPU sampling value; and comparing the maximum values of the two fundamental wave effective values with a preset value discriminating threshold, wherein the maximum values is separately distinguished for a large valuecase and a small value case: for the large value case, if a preset low discriminating threshold condition of the large value is met, the current sampling inconsistency is discriminated by a long delay, if the preset high discriminating threshold condition of the large value is met, the current sampling inconsistency is discriminated by a short delay, and for the small value case, if the preset low discriminating threshold condition of the small value is met, the current sampling inconsistency is discriminated by a long delay, if the preset high discriminating threshold condition of the smallvalue is met, the current sampling inconsistency is discriminated by a short delay. The method can improve the reliability of the current analog sampling in the relay protection.

Description

technical field [0001] The invention relates to a method for judging inconsistent current sampling in a relay protection device and a processing method, and belongs to the technical field of relay protection. Background technique [0002] With the development of the power system, the requirements for the reliability of relay protection for power secondary equipment are getting higher and higher. The sampling of the secondary current analog quantity is one of the important sources of the logic judgment of the relay protection element, and the reliability of its data acquisition directly affects the correctness of the action of the protection element. Therefore, ensuring the reliability of secondary current analog data acquisition is of great significance to the reliability of relay protection action and the stable operation of the power system. [0003] In order to ensure the reliable operation of relay protection devices, many relay protection devices adopt a dual-CPU archi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 张灏邹磊薛明军张祥韩志勇王胜陈实
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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