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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 lack of fault information, failure to locate faults, and deviation of grounding resistance calculation results

Inactive Publication Date: 2007-08-22
TSINGHUA UNIV
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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

[0064] The principle and specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0065] In the past, when analyzing the equivalent circuit of 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 excitation impedance was large and considered an open circuit. In fact, the excitation impedance of the distribution transformer is not infinite, and the leakage reactance will also produce a voltage drop. Figure 1 is a T-type equivalent circuit considering the parameters of the distribution transformer. where: R 1 ', X 1 ' with R 2 、X 2 are the leakage impedance of the primary and secondary side windings respectively; R m ', X m 'is the excitation impedance; each parameter is the value converted to the secondary side at 20Hz, where R 1 '=R 2 = R k / 2,X 1 '=X 2 =X k / 2;R k 、X k is the short...

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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 relay protection for main equipment in a power system, and in particular relates to a generator stator single-phase ground protection and fault location method with an external 20Hz power supply and fundamental wave zero-sequence voltage. Background technique [0002] Although a stator ground fault is less harmful than an internal short circuit fault in the generator winding, it is a precursor to a more serious short circuit fault. Timely detection of ground faults will greatly reduce the probability of generator internal short-circuit faults, so the stator single-phase ground protection is one of the important components of 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 distribution transformer secondary side connection resistance, and the installation of external power supply type stator singl...

Claims

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Application Information

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