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A Merging Unit with the Function of Abnormal Detection of Protective Current Transformer Output

A technology of protection current and abnormal detection, which is applied in the direction of instruments, measuring devices, and measuring electrical variables, etc., and can solve problems such as virtual connection, protection malfunction, and waveform distortion

Active Publication Date: 2017-11-21
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In engineering applications, due to defects in manufacturing, welding, processing and other links, problems such as virtual welding and virtual connection of secondary transformers (small CT, small PT) occur from time to time, resulting in waveform distortion, protection malfunction and other consequences, affecting power reliable operation of the system

Method used

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  • A Merging Unit with the Function of Abnormal Detection of Protective Current Transformer Output

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Embodiment Construction

[0016] 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.

[0017] like figure 1 As shown, the merging unit is equipped with protective current transformers and zero-sequence current transformers at the same time; the protective current transformers are connected to the three-phase protection currents of the power system A, B, and C, and the three-phase currents are connected in series to the zero-sequence current transformers. The merging unit A / D system simultaneously collects the connected A, B, C three-phase protection current (phase current) and external zero-sequence current, organizes them into digital messages, and transmits them externally for use by other relay protection and control equipment in substations . The merging unit collects the A,...

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Abstract

The invention discloses a merging unit with the function of detecting abnormal output of a protection current transformer. The merging unit is provided with a protection current transformer and a zero-sequence current transformer to collect A, B, and C three-phase protection currents and zero-sequence currents; the protection current mutual inductance The transformer is connected to the three-phase protection current of the power system A, B, and C, and the three-phase current is connected in series to the zero-sequence current transformer; the sudden change of the phase current and the sudden change of the zero-sequence current are calculated; the calculated sudden change of the phase current The result is compared with the result of zero-sequence current mutation; the merging unit synthesizes the three-phase protection current of A, B, and C into a self-produced zero-sequence current, and judges the inconsistency of the instantaneous value of the sampling point with the external zero-sequence current, and performs self-produced zero-sequence current Compared with the instantaneous value of the sampling point of the external zero-sequence current, the abnormal output data of the protective current transformer can be quickly judged, and the data can be quickly marked as wrong data, so as to prevent the substation protection and control device from making wrong logical judgments due to abnormal data interference.

Description

technical field [0001] The invention relates to a merging unit with a function of detecting abnormal output of a protection current transformer and a working method thereof, and belongs to the field of intelligent automatic safety devices for substations. Background technique [0002] Current and voltage acquisition is an indispensable part of the substation, and is closely related to protection, measurement and control, measurement and other links. In engineering applications, due to defects in manufacturing, welding, processing and other links, problems such as virtual welding and virtual connection of secondary transformers (small CT, small PT) occur from time to time, resulting in waveform distortion, protection malfunction and other consequences, affecting power reliable operation of the 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 eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
Inventor 赵谦钱国明陈福锋
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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