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Protection and fault positioning method for generator stator winding single-phase earthing

A generator stator, single-phase grounding technology, applied in the direction of emergency protection circuit devices, measuring electricity, electrical components, etc., can solve problems such as deviation of grounding resistance calculation results, lack of fault location, lack of fault information, etc.

Inactive Publication Date: 2005-01-05
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

However, the existing external power supply single-phase grounding protection does not consider the influence of the neutral point grounding transformer parameters, which leads to large deviations in the calculation results of grounding resistance
[0004] Due to the lack of necessary fault information, the current generator stator single-phase ground protection does not have the function of fault location

Method used

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  • Protection and fault positioning method for generator stator winding single-phase earthing
  • Protection and fault positioning method for generator stator winding single-phase earthing
  • Protection and fault positioning method for generator stator winding single-phase earthing

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Embodiment Construction

[0065] The principle and specific implementation manners of the present invention will be explained below in conjunction with the accompanying drawings.

[0066] In the past, when analyzing the equivalent circuit of the external power supply type single-phase grounding protection, it was considered that the leakage impedance of the distribution transformer was small and negligible, and the magnetizing impedance was large and considered an open circuit. In fact, the magnetizing impedance of a distribution transformer is not infinite, and the leakage reactance will also produce a voltage drop, such as figure 1 It is a T-shaped equivalent circuit considering the parameters of the distribution transformer. Where: R 1 ′、X 1 ′ And R 2 , X 2 Are the leakage impedance of the primary and secondary windings respectively; R m ′、X m ′Is the magnetizing impedance; each parameter is the value converted to the secondary side under 20Hz, where R 1 ′=R 2 =R k / 2, X 1 ′=X 2 =X k / 2; R k , X k It i...

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Abstract

This invention relates to a single-phase earth protection of a generator stator windings and its fault positioning method characterizing in considering the influence of the parameter of a neutral point earth device to the computation of earth resistance value, it also applies trouble locating when each phase earth voltage and zero sequence voltage of the generator end carries out stator winding single phase earth to solve the problem of low accuracy of the earth fault resistance value computation of current added 20Hz power source stator winding single phase earth protection, the error is limited less than 10% so as to relatively solve the problem of fault positioning of a generator stator single phase earth.

Description

Technical field [0001] The invention belongs to the technical field of power system main equipment relay protection, and in particular relates to a generator stator single-phase grounding protection and fault location method with an external 20Hz power supply and a fundamental zero-sequence voltage. Background technique [0002] Compared with the internal short-circuit fault of the generator winding, although the stator ground fault is less harmful, it is the precursor of a more serious short-circuit fault. The timely detection of ground faults will greatly reduce the probability of short-circuit faults inside the generator. Therefore, the stator single-phase grounding protection is one of the important components in the generator relay protection system. [0003] At present, large-scale generators newly built and to be built adopt the neutral point grounding method of the secondary side resistance of the distribution transformer, and the installation of external power supply typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06H02H7/06
Inventor 毕大强王祥珩王维俭
Owner TSINGHUA UNIV
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