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A method for estimating the low-voltage side current when the high-voltage side of the main transformer is single-phase grounded

A main transformer, single-phase grounding technology, applied in the direction of only measuring current, measuring current/voltage, instruments, etc., can solve the problems of large margin, waste, inability to install, etc., to meet the requirements of use, prevent misoperation, and simplify calculation. Effect

Active Publication Date: 2022-04-05
NORTH CHINA POWER ENG
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Problems solved by technology

However, if the value is too large without calculation, it may meet the requirements, but the margin may be too large to cause waste, or even impossible to install
In addition, the calculation of short-circuit current during single-phase short circuit is not only related to the parameters of the unit, but also related to other units in the factory and the power system. However, it is difficult to obtain these parameters in the initial stage of project construction, so this will affect the generator. The determination of side current transformer parameters may affect the construction period of the entire project

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  • A method for estimating the low-voltage side current when the high-voltage side of the main transformer is single-phase grounded
  • A method for estimating the low-voltage side current when the high-voltage side of the main transformer is single-phase grounded
  • A method for estimating the low-voltage side current when the high-voltage side of the main transformer is single-phase grounded

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[0045] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings. In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

[0046] The invention patent determines the single-phase grounding fault condition of the current transformer on the low-voltage side of the main transformer (that is, the generator side) according to the rated breaking current of the circuit breaker on the high-voltage side of the main transformer. When...

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Abstract

This application provides a method for estimating the low-voltage side current when the high-voltage side of the main transformer is single-phase grounded, which is based on the rated breaking current of the main transformer high-voltage side circuit breaker, and calculates and determines the single-phase of the main transformer high-voltage side line of the current transformer on the generator side reclosing current. It obtains the maximum current on the generator side when the high-voltage side of the main transformer is single-phase short-circuited, and only needs to know the rated breaking current of the circuit breaker on the high-voltage side of the main transformer, without knowing the parameters of the power system.

Description

technical field [0001] This application relates to the technical field of power grid fault diagnosis, in particular to a method for estimating the low-voltage side current when the high-voltage side of the main transformer is single-phase grounded, which is applicable to the low-voltage side current (ie generator side) estimates. Background technique [0002] In the previous engineering design, there was a parameter in the technical conditions of the current transformer on the generator side (including the condenser side in the substation) that must be determined when ordering: when a single-phase fault occurs in the high-voltage side line of the main transformer, the generator How big is the current on the side, the current transformer must output this current accurately, otherwise the protection device may malfunction. However, if the value is too large without calculation, it may meet the requirements, but the margin may be too large to cause waste, or even impossible to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 姚四旺李和
Owner NORTH CHINA POWER ENG
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