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Method for automatically checking protection functions of microcomputer main-transformer differential protection device

A technology of differential protection device and protection function, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of missing calibration, insufficient inspection work time, hidden dangers of power system safety, etc., to improve work efficiency and improve equipment. The level of safe operation and the effect of eliminating potential safety hazards

Active Publication Date: 2014-11-12
STATE GRID CORP OF CHINA +1
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Problems solved by technology

The growth rate of personnel is far behind the growth rate of equipment, resulting in insufficient inspection work time, poor standardization of equipment calibration level and test items, and even missing or incorrect calibration, resulting in potential safety hazards in power system operation

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  • Method for automatically checking protection functions of microcomputer main-transformer differential protection device

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Embodiment Construction

[0031] The method for automatically verifying the protection function of the microcomputer-based main transformer differential protection device provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The present invention utilizes the hardware resources generally configured in the existing protection devices, does not need to add additional hardware, and adopts the method of adding an independent test program to realize function verification; its hardware cooperation logic is as follows: figure 1 shown; at the same time, it does not need the analog input of the external loop to simulate the fault, but uses the method of setting the simulated fault by the device software, such as figure 2 As shown; the accuracy verification of the sampling part of the device should be carried out by means of a protection tester and other methods. Without increasing hardware overhead and changing hardwa...

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Abstract

The invention discloses a method for automatically checking the protection functions of a microcomputer main-transformer differential protection device. The method includes the steps of starting a checking mode, shutting external alternating current sampling, reading a protection control word and a protection control definite value, starting to test an item of a test, judging whether protection is input or not, shutting other protection functions, generating a test sequence according to the definite value, carrying out alternating current input assignment, judging whether the protection acts or not, recording action values and action evaluation, releasing protection function shutting, judging whether the test is completed or not, generating a function checking report, printing the function checking report, exiting from the checking mode, starting external alternating current sampling and the like. By means of the method, extra hardware cost and extra outside loop wiring are not needed, testing of the various protection functions of the whole device can be completed without manual intervention and protection for a tester, the testing process and the testing result are dynamically displayed in real time, and the test report is automatically generated. Due to the automatic checking technology, device test items are standardized, and technical errors, such as test item missing, testing method mistaking and testing result misjudgment, caused by the capacity of workers are avoided.

Description

technical field [0001] The invention belongs to the technical field of relay protection and automatic control of electric power system, and in particular relates to a protection function automatic verification method of a microcomputer main transformer differential protection device. Background technique [0002] The main transformer differential protection is a very important component protection in the power system, which plays an important role in ensuring the safe and stable operation of the power grid. At present, the microcomputer main transformer differential protection is widely used in the field of 35kV ~ 500kV main transformer protection. Most of the microcomputer-based main transformer differential protection adopts the principle of ratio braking to prevent malfunctions when faults occur outside the zone, and applies the principle of harmonic braking or waveform symmetry algorithm to prevent excitation inrush current. Due to the different CT transformation ratios...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 张志朋李刚谭靖李枫曹北建李展毕宏图孙宁孙晓岚于丽雅
Owner STATE GRID CORP OF CHINA
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