A fault identification method for high-voltage generators in and out of the zone

A technology of out-of-area fault and identification method, applied in the direction of motor generator testing, etc., can solve the problems of low accuracy and reliability, and achieve the effect of novel criteria, simple theory, and elimination of inherent defects

Inactive Publication Date: 2015-08-19
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] In order to solve the problem of low accuracy and reliability of the method for distinguishing inside and outside the stator ground fault area of ​​a high-voltage generator, the present invention proposes a fault identification method for high-voltage generators inside and outside the area, which can more effectively distinguish the fault state from the non-fault state, Effectively Improve the Accuracy and Reliability of Generator Stator Ground Fault Protection

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  • A fault identification method for high-voltage generators in and out of the zone
  • A fault identification method for high-voltage generators in and out of the zone
  • A fault identification method for high-voltage generators in and out of the zone

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Embodiment Construction

[0024] figure 1 It is a schematic diagram of the system structure of the present invention. Two current transformers are connected to both sides of the high-voltage generator to extract current data on both sides of the high-voltage generator; the voltage transformer is connected to the terminal of the high-voltage generator, and the zero-sequence voltage U 0 It is taken from the open delta winding of the voltage transformer at the machine end of the high-voltage generator; the high-voltage generator supplies power to the external system through the common bus in the factory.

[0025] In order to verify the feasibility of a high-voltage generator internal and external fault identification method described in the present invention, according to figure 1 The system shown was tested.

[0026] The values ​​of various parameters are as follows: rated voltage 150kV; total capacitance of each phase of the external system is 0.15μF; each phase-to-ground capacitance of the high-voltag...

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Abstract

The invention discloses a method for identifying internal and external faults of a high-voltage generator. The method comprises the following steps: acquiring data before and after faults of the high-voltage generator under n kinds of modes; recording the data of the high-voltage generator under the nth mode when zero sequence voltage and triple harmonic voltage exceed limits; calculating data distribution similarity of any two modes; and identifying the internal and external faults of the high-voltage generator according to the similarity of data distribution. The method for identifying the internal and external faults of the high-voltage generator has the characteristics of being high in precision and strong in practicability; and with the adoption of the method, the internal and external faults of the high-voltage generator can be effectively distinguished.

Description

technical field [0001] The invention relates to a method for identifying faults in and out of a high-voltage generator. Background technique [0002] In recent years, with the rapid development of my country's electric power industry, more and more large-capacity generators are used in the system. The safe and normal operation of generators is directly related to the continuous and stable operation of the entire power system. In particular, high-voltage generators have high voltage levels, high cost, and complex structures. Once they are damaged due to faults, they will cause a series of problems such as wide-ranging, difficult maintenance, long maintenance time, and heavy economic losses. The stator grounding fault is a major fault type of the generator. If it is not protected and dealt with in time, it will easily cause local overheating at the fault point, burn the stator bar and iron core, and affect the normal operation of the generator. The high-voltage generator need...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
Inventor 王媛媛曾祥君袁俊杨毅黄跃
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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