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A method for automatic verification of the protection function of a computer-based main transformer differential protection device

A technology of differential protection device and protection function, applied in measurement devices, measuring electrical variables, instruments, etc., can solve problems such as hidden dangers of power system safety, insufficient inspection time, and missing calibration, so as to eliminate hidden dangers and improve equipment. The effect of safe operation level and improved work efficiency

Active Publication Date: 2016-09-14
STATE GRID CORP OF CHINA +1
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  • Description
  • Claims
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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

Method used

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  • A method for automatic verification of the protection function of a computer-based main transformer differential protection device
  • A method for automatic verification of the protection function of a computer-based main transformer differential protection device
  • A method for automatic verification of the protection function of a computer-based 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 function of a microcomputer-based main transformer differential protection device. It includes starting the verification mode; blocking external AC sampling; reading protection control words and fixed values; entering a test; judging whether the protection is enabled; blocking other protection functions; generating test sequences according to the fixed values; Whether to operate; record the action value and action evaluation; release the protection function lockout; judge whether the test is completed; generate a function verification report; print the report; exit the verification mode; open external communication sampling and other steps. The invention does not require additional hardware overhead and external circuit wiring, and can complete the test of various protection functions of the entire device without manual intervention and a protection tester, real-time dynamic display of the test process and results, and automatic generation of test reports. The automatic calibration technology standardizes the equipment test items and avoids technical errors such as missing items in the inspection, wrong inspection methods, and misjudgment of inspection results due to the quality of personnel.

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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Patent Type & Authority Patents(China)
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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