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Method for monitoring one-point grounding of secondary neutral point of voltage transformer between transformer substation and power plant

A power plant voltage and transformer technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of labor and time consumption, and achieve the effect of avoiding power grid accidents, filling the gap of lack of monitoring means, and good monitoring effect

Inactive Publication Date: 2010-06-09
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a monitoring method for one-point grounding of the secondary neutral point of voltage transformers in substations and power plants, so as to overcome the labor and time-consuming shortcomings of the prior art

Method used

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  • Method for monitoring one-point grounding of secondary neutral point of voltage transformer between transformer substation and power plant
  • Method for monitoring one-point grounding of secondary neutral point of voltage transformer between transformer substation and power plant

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Embodiment Construction

[0008] Embodiments of the present invention: as figure 1 As shown, install a high-precision bushing-type zero-sequence current transformer on the protective screen of the secondary neutral point of the voltage transformer of the substation and power plant voltage transformer (N600), so that the grounding loop passes through it, and the The secondary terminal of the zero-sequence current transformer is connected to the current indicating milliampere meter, and the output contact signals "801" and "803" are added to the measurement and control panel for alarm.

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Abstract

The invention discloses a method for monitoring one-point grounding of a secondary neutral point of a voltage transformer between a transformer substation and a power plant, i.e. a high-precision sleeve-type zero-sequence current transformer is additionally arranged on a one-point grounding circuit of the secondary neutral point of the voltage transformer between the transformer substation and the power plant, a secondary lead-out end of the zero-sequence current transformer is connected with a current indicator to take the current of the secondary neutral point circuit. When in use, the invention can monitor the grounding current of the one-point grounding circuit of the secondary neutral point of the voltage transformer at any time, compare the grounding current with the current to earth of the one-point grounding when operating, and alarm at the same time, thereby judging whether grounding points are increased or not and avoiding the incorrect action of a protection device. The invention has good function of monitoring the grounding state of the secondary neutral point of the voltage transformer between the transformer substation and the power plant, thereby supplementing the blank that the circuit is lack of monitoring ways because of the automation of the transformer substation.

Description

technical field [0001] The invention relates to a one-point grounding monitoring method for the secondary neutral point of voltage transformers in substations and power plants. Background technique [0002] If there is a multi-point grounding phenomenon at the secondary neutral point of the voltage transformer in the substation and power plant, it is very likely that the voltage sensed by the protective device will be distorted due to the superimposed voltage at the secondary neutral point at the same time as the line short-circuit fault occurs. Protection against movement or misoperation. [0003] At present, there is no relevant monitoring method for the secondary neutral point grounding loop of voltage transformers in substations and power plants. Usually, after a protection malfunction occurs in the power grid, it is judged by analysis that the secondary neutral point is caused by multi-point grounding. The method of power outage inspection to find redundant grounding p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 周伟
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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