Power plant CT secondary through-flow method

A power plant and flow-through technology, which is applied in the direction of electric winding test, measurement of electric variables, measuring devices, etc., can solve the problems of long flow time, high work intensity, and poor test convenience, so as to achieve strong practicability and improve test efficiency Effect

Pending Publication Date: 2021-11-02
NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used CT secondary flow method is carried out in the terminal box of the CT body, and the test is carried out by performing secondary flow on each phase of each group of CTs. This method has the disadvantages of high work intensity, long flow time, and test poor convenience

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  • Power plant CT secondary through-flow method

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Embodiment Construction

[0040] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] This embodiment provides a CT secondary flow method in a power plant, including:

[0042] Connect all the current circuits of each CT in series, and check the correctness and completeness of the wiring of all CT secondary circuits by applying current to one place of a local terminal box during the CT secondary flow test.

[0043] By applying currents of different amplitudes and phase sequences, the correctness of the CT secondary circuit is further checked, and the correctness of the generator-transformer protection cabinet, fault recording cabinet, DCS background sampling and parameter settings is checked at the same time.

[0044] ginseng figure 1 As shown (only...

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Abstract

The invention relates to a power plant CT secondary through-current method, which comprises the following steps of: connecting all current loops of each CT in series, and checking the correctness and integrity of wiring of all CT secondary loops by applying current at one position of a certain local terminal box during a CT secondary through-current test; further checking the correctness of a CT secondary circuit by applying currents with different amplitudes and phase sequences, and checking the correctness of a generator-transformer group protection cabinet, a fault recording cabinet and DCS background sampling and parameter setting at the same time. Through-flow does not need to be carried out at each CT terminal, the test efficiency is improved, the practicability is high, and the method is suitable for different power plant electrical main systems.

Description

technical field [0001] The invention relates to the technical field of electric power testing, in particular to a CT secondary flow method of a power plant. Background technique [0002] Before the unit is put into operation or when the unit is overhauled, the power plant needs to check and confirm the wiring, transformation ratio, accuracy level, polarity, etc. of the CT (current transformer) of the whole plant to ensure that the CT body and the secondary circuit are correct and there is no open circuit phenomenon. , otherwise it will affect the safe and stable operation of the power system, among which CT secondary flow is a necessary test item. [0003] At present, the commonly used CT secondary flow method is carried out in the terminal box of the CT body, and the test is carried out by performing secondary flow on each phase of each group of CTs. This method has the disadvantages of high work intensity, long flow time, and test Convenience and other issues. Contents ...

Claims

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Application Information

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IPC IPC(8): G01R35/02G01R31/72
CPCG01R35/02G01R31/72
Inventor 王思聪罗凯张清杜辉袁鹏涛刘武旭邓桥
Owner NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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