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PT broken line detection method during slow melting of generator terminal primary fuse

A disconnection detection and generator technology, which is applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problem of inability to accurately judge whether the voltage transformer is disconnected, and achieve wide application range, strong adaptability and high reliability Effect

Active Publication Date: 2017-10-20
ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a PT disconnection detection method for the slow melting of the primary fuse at the generator end, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem in the prior art by comparing two sets of voltage transformers of the generator. The method of side line voltage vector difference and negative sequence voltage vector difference cannot accurately judge whether the voltage transformer is disconnected when the primary fuse of the generator is slowly blown.

Method used

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  • PT broken line detection method during slow melting of generator terminal primary fuse
  • PT broken line detection method during slow melting of generator terminal primary fuse
  • PT broken line detection method during slow melting of generator terminal primary fuse

Examples

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Effect test

Embodiment 1

[0045] Embodiment 1: as attached figure 1 , 2 As shown, the PT disconnection detection method for the slow melting primary fuse at the generator end includes the following steps:

[0046] The first step, data acquisition, collects the three-phase voltage of the generator terminal and calculates the zero-sequence voltage U of the generator terminal L , The second harmonic U of the zero-sequence voltage at the generator terminal 2L , The line voltage U of the first voltage transformer 1PT at the generator end AB , U BC , U CA , Generator terminal second voltage transformer 2PT line voltage U ab , U bc , U ca , Negative sequence voltage U of the first voltage transformer 1PT at the generator end 2 , Negative sequence voltage U of the second voltage transformer 2PT at the generator end 2 ';

[0047] The second step is to determine the judgment condition of whether the first voltage transformer 1PT and the second voltage transformer 2PT are disconnected;

[0048](1) Dete...

Embodiment 2

[0075] Embodiment 2: as attached figure 1 , 2 , 3, 4, 5, 6, 7, 8, 9, 10, and 11, the PT disconnection detection method for the slow melting primary fuse at the generator end is to compare the 1PT and 2PT at the generator end by using the judgment condition 1 The modulus of the line voltage vector difference, including the following cases:

[0076] (1) When one of the PTs has a single-phase voltage disconnection and the other PT is normal, the line voltage amplitude corresponding to the single-phase disconnection PT becomes the phase voltage amplitude, and the normal PT line voltage remains unchanged. The modulus value of the voltage vector difference is 57.74V, which is greater than the threshold value of 5V, which can be judged as PT disconnection;

[0077] (2) When one of the PTs has a two-phase voltage disconnection and the other PT is normal, the line voltages corresponding to the two-phase disconnection PTs become 0V and 57.74V respectively, the normal PT line voltage r...

Embodiment 3

[0086] Embodiment 3: as attached figure 1 , 2 , 3, 4, 5, 6, 7, 8, 9, 10, and 11, the PT disconnection detection method for the slow melting primary fuse at the generator end is to compare the 1PT and 2PT at the generator end by using the second judgment condition The modulus of the negative sequence voltage vector difference of , including the following cases:

[0087] (1) When one of the PTs has a single-phase voltage disconnection and the other PT is normal, the negative sequence voltage value of the disconnected PT is -19.24V, the negative sequence voltage of the normal PT is 0V, and the modulus value of the negative sequence voltage difference is 19.24V , greater than 3V, it can be judged as PT disconnection;

[0088] (2) When one of the PTs has a two-phase voltage disconnection and the other PT is normal, the negative sequence voltage value of the disconnected PT is -9.62+j16.66, the negative sequence voltage of the normal PT is 0V, and the modulus of the negative seque...

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Abstract

The invention relates to the voltage transformer broken line detection technology field and particularly relates to a PT broken line detection method during slow melting of a generator terminal primary fuse. The method comprises steps that step 1, data acquisition is carried out; step 2, line break determination conditions of a first voltage transformer and a second voltage transformer are determined; step 3, when the generator primary fuse melts slowly, if the first determination condition and the second determination condition of the step 2 are not satisfied, an actual work current of the fuse connected with a generator is measured, the actually-measured current of the fuse is I fuse, a rated current of the fuse is I fuse e, an excitation voltage break variable is set to be deltaUfd, and the third determination condition is determined; and step 4, if one of the first voltage transformer and the second voltage transformer of the generator terminal has a broken line, alarm is carried out, and the progress is over. The method is advantaged in that slow melting of the generator voltage transformer primary fuse and complete line break conditions of primary and secondary voltage loops can be accurately detected, and strong adaptability, wide use scope and high reliability are realized.

Description

technical field [0001] The invention relates to the technical field of voltage transformer disconnection detection, and relates to a PT disconnection detection method for the slow-melting primary fuse at the generator end. Background technique [0002] At present, the voltage transformer disconnection detection method of the generator terminal voltage transformer in a thermal power plant is based on the secondary side voltage vector state after the voltage loop is completely disconnected, and the slow-blow state of the fuse that is not completely disconnected in the voltage loop is not used. Included in the detection range of voltage transformer disconnection. When the primary fuse of the generator is slowly melting, it is impossible to make an accurate judgment on the slow melting of the primary fuse by comparing the secondary voltage vector difference and the negative sequence voltage vector difference of the two sets of voltage transformers of the generator. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 胡帅马涛周勇朱建华赵启王利超帕提古丽·阿布丁
Owner ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER
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