System for abnormal data identification based on merging unit

Abstract

The present invention discloses a system for abnormal data identification based on a merging unit. The system comprises a mutual inductor, a collector and a merging unit. The mutual inductor collects one-time current and voltage data, performs integration conversion to form digital quantity and transmits the digital quantity to the collector; the merging unit receives sampling data sent from the collector, performs protocol conversion and sends the sample data to a protective device; and the merging unit receives sample instant data of the collector and calculated adjacent sample point instant difference of phase current and phase voltage in real time, regulates the maximum sampling value of the last cyclic wave in real time through each cyclic wave according to the sampling cyclic wave amplitude and the sampling frequency of the message sent by the collector, and repeatedly calculates the mutation threshold value according to the value, determines whether the adjacent sampling point instant difference value exceeds the mutation threshold value or not, reports the sample abnormality when the instant difference value exceeds the mutation threshold value and marks the sampling points having the instant difference value exceeding the mutation threshold value as the mutation value. The system for abnormal data identification based on the merging unit can rapidly determine the abnormal data output by the collector so as to avoid logic misjudgement of a transformer station protection control device.

Description

technical field [0001] The invention relates to a system for identifying abnormal data based on a merging unit, and belongs to the technical field of intelligent automatic safety devices for substations. Background technique [0002] Electronic transformers and collectors are an indispensable part of substations, and are closely related to protection, measurement and control, measurement and other links. In engineering applications, the communication between electronic transformers, collectors and digital merging units will be affected by the outside world, resulting in waveform distortion, protection malfunction and other consequences, affecting the reliable operation of the power system. How to quickly and accurately detect secondary transformer faults and ensure reliable operation of the sampling system has become an important issue faced by power users and equipment manufacturers. Contents of the invention [0003] In view of the deficiencies in the prior art, the pur...

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Problems solved by technology

In engineering applications, due to external influences such as communication between electronic transformers, collectors and digital merging units, waveform distortion, protection malfunctions and other consequences will be caused, which will affect the reliable operation of the power system

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