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Method for detecting generator stator single-phase earthing fault direction

A single-phase ground fault, generator stator technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve the problems of common zero-sequence voltage schemes, high prices, and poor practical applications, and achieve high sensitivity and reliability effect

Inactive Publication Date: 2007-11-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price, the practical application of this scheme is not as common as the zero-sequence voltage scheme, and it also has the disadvantage of no selectivity

Method used

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  • Method for detecting generator stator single-phase earthing fault direction
  • Method for detecting generator stator single-phase earthing fault direction
  • Method for detecting generator stator single-phase earthing fault direction

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Embodiment Construction

[0022] The embodiments of the present invention are described in detail below: this embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following embodiments.

[0023] This embodiment is carried out on a 15kVA salient pole analog generator. Each phase of the machine has two parallel branches, and each branch has 10 coils in series. The 5 coils near the machine end are 4 turns per coil, and 5 coils are connected near the neutral point. A coil is 2 turns. There are 3 fault points a1 (α=40%), a3 (α=70%), a5 (α=90%) on the A1 branch road, and 3 fault points a2, a4, a6 on the A2 branch road , the electrical positions are symmetrically distributed. Before the short circuit, the motor is in rated operation, the excitation current is 1.55A, the output power is 12kW, the power factor is 0.8, and the rated ph...

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Abstract

A method to detect of generator stator of a single-phase ground fault belongs to relay protection. Methods are as follows: using of generators and adjacent to the neutral point zero sequence voltage, machine-zero-sequence current component consumption as a reference, current transformer and voltage transformer wiring form of a standard wiring; under generator-and-neutral fault component adjacent to the third harmonic voltage and phase angle at the same small impose a certain value to determine from the neutral point 50 percent of the internal generator stator single-phase ground fault; under generator terminal voltage and zero-sequence - current weight-zero sequence of phase angle relationship to determine from the neutral 50% -100% within the scope of the internal generator stator whether single-phase fault. This invention has high sensitivity and reliability.

Description

technical field [0001] The invention relates to a method in the technical field of motor grounding protection, in particular to a method for detecting the direction of a generator stator single-phase grounding fault. Background technique [0002] Due to the large capacity of a single unit, the status of large-scale generator sets has become very important. Its safe operation directly affects the stability of the power grid. The direct and indirect economic losses caused by the national economy are huge. The single-phase grounding of the stator of the generator is often a harbinger of a phase-to-phase or inter-turn short circuit, so the stator grounding protection is of great significance. [0003] After searching the literature of the existing technology, it was found that Huang Shaofeng et al. published "Generator Stator Grounding Protection Based on the Principle of Third Harmonic Phase Angle Sudden Change" in "Power Grid Technology" No. 12, 2000. The article proposed: In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R19/00
Inventor 邰能灵
Owner SHANGHAI JIAO TONG UNIV
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