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A method for locating the fault location of inter-turn short circuit of doubly-fed generator rotor

An inter-turn short-circuit fault, generator rotor technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc.

Inactive Publication Date: 2017-01-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the limitations of existing rotor winding turn-to-turn short-circuit fault location technology applicable to models, the present invention proposes a method that is simple, feasible, accurate and suitable for doubly-fed generators to locate the location of rotor winding turn-to-turn short-circuit faults

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  • A method for locating the fault location of inter-turn short circuit of doubly-fed generator rotor
  • A method for locating the fault location of inter-turn short circuit of doubly-fed generator rotor
  • A method for locating the fault location of inter-turn short circuit of doubly-fed generator rotor

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] The present invention specifically comprises the following steps:

[0050] A. Set up the detection coil:

[0051] For the special structure of the doubly-fed generator with a small air gap, the detection coil is firstly set to meet the requirements of the doubly-fed generator structure.

[0052] A1. Take the same enamelled copper wire as the stator winding of the generator and the wire diameter is φ to make the detection coil.

[0053] A2. Set up semicircular open slots 7 with a diameter of φ on the side of the generator stator slot wedge 6 close to the air gap at 0.5 mm from both sides of the slot wedge width direction and along the length direction of the slot wedge, and place the two effective sides of the detection coil 8 Respectively embedded in the opening groove and fixed, such as figure 2 shown. This design not onl...

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Abstract

The invention discloses a positioning method of a turn-to-turn short circuit fault of a doubly-fed generator rotor. The positioning method comprises the steps of arranging a detection coil and a photoelectric device, numbering slots of the generator rotor, determining the zero moment of the photoelectric device, collecting normal data, collecting fault data, positioning the fault and the like. By means of the positioning method, the turn-to-turn short circuit fault of the generator rotor can be accurately positioned without disassembling a generator. The positioning method is suitable for motors with small air gaps and wound rotors and has great significance in quickly removing the fault, maintaining efficient operation of a wind power plant and guaranteeing stable power supply of a power grid.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a method for locating the location of a double-fed generator rotor inter-turn short-circuit fault. Background technique [0002] Turn-to-turn short-circuit fault of rotor winding is one of the frequent faults in the operation of doubly-fed wind turbines. After the inter-turn short-circuit fault of the winding of the generator occurs, it will cause local overheating of the winding and aggravate the vibration of the unit. If the fault cannot be eliminated in time, it will cause serious accidents and threaten the stability of the power grid. [0003] At present, the methods for monitoring inter-turn short-circuit faults in the rotor windings of double-fed wind turbines are: 1) Spectrum analysis method: when the generator is running normally, the voltage and current frequency on the stator side is the fundamental frequency, and the rotor side is the excitation frequency. After th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06
Inventor 李俊卿张立鹏史玮明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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