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Merging unit with protection current transformer output abnormity detection function

A technology of protection current and abnormal detection, applied in instruments, measuring devices, measuring electrical variables, etc., can solve problems such as virtual welding, affecting the reliable operation of the power system, and virtual connection.

Active Publication Date: 2015-10-28
NANJING GUODIAN NANZI POWER GRID AUTOMATION
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  • Claims
  • Application Information

AI Technical Summary

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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  • Merging unit with protection current transformer output abnormity detection function
  • Merging unit with protection current transformer output abnormity detection function

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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] Such as 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...

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Abstract

The invention discloses a merging unit with a protection current transformer output abnormity detection function. The merging unit comprises a protection current transformer and a zero sequence current transformer which are respectively used for collecting A, B and C three phases of protection currents and a zero sequence current; the protection current transformer is connected with the A, B and C three phases of protection currents of an electric power system and outputs the three phases of currents to the zero sequence current; Break variables of phase currents and zero sequence current break variables are calculated; the calculated phase current break variable result is compared with the zero sequence current break variable result; the merging unit merges the A, B and C three phases of protection currents into a self-produced zero sequence current, sampling point instantaneous value inconformity discrimination is carried out on the self-produced zero sequence current and an external zero sequence current, and sampling point instantaneous value comparison is carried out on the self-produced zero sequence current and the external zero sequence current, so that output data abnormity of the protection current transformer can be determined rapidly, data is rapidly marked as fault data, and a transformer substation protection control device is prevented from making wrong judgment due to interference of abnormal data.

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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IPC IPC(8): G01R35/02
Inventor 赵谦钱国明陈福锋
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION
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