Device and method for diagnosing inter-turn short circuit of turbogenerator rotor based on detection coil

A technology for turbogenerators and detection coils, applied to measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of low feasibility, achieve high sensitivity, good adaptability, and prevent the deterioration of inter-turn short circuit faults

Active Publication Date: 2019-06-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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Problems solved by technology

Therefore, this method has only been verified in the laboratory, and the feasibility of putting it into practical application is not high.
[0009] In a word, although the on-line detection of inter-turn short-circuit faults in the rotor windings of turbogenerators is paid much attention to, the existing diagnostic methods still have some deficiencies in their application, so it is necessary to further improve the diagnostic level of such faults

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  • Device and method for diagnosing inter-turn short circuit of turbogenerator rotor based on detection coil
  • Device and method for diagnosing inter-turn short circuit of turbogenerator rotor based on detection coil
  • Device and method for diagnosing inter-turn short circuit of turbogenerator rotor based on detection coil

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Embodiment Construction

[0073]The standard parts used in the present invention can be purchased from the market, and the special-shaped parts can be customized according to the instructions and the accompanying drawings. The specific connection methods of each part adopt mature bolts, rivets, welding in the prior art , pasting and other conventional means, no longer described in detail here.

[0074] The list of symbols in the text is: P, the number of pole pairs of the turbogenerator, usually P=1 or P=2; i, a positive integer, i=1, 2, 3, 4...; F f , The excitation magnetic potential of the generator when the rotor winding is normal; △F f , The magnetic potential generated by the reverse current flowing into the short-circuited rotor winding; θ r , the electrical angle of the rotor space; β, the electrical angle between the rotor slots; α k , the number of turns of the kth slot winding; γ, the angle of the large tooth area occupying the rotor circumference; I f , excitation current; m, short-circu...

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Abstract

The invention discloses a steam turbine generator rotor turn-to-turn short circuit diagnosis device based on a detection coil. The device is characterized by comprising the U-shaped detection coil radially mounted inside a generator in a manner of stretching across a stator iron core section, a high-resistance-value resistor is parallelly connected at an outlet of the U-shaped detection coil, the U-shaped detection coil is composed of high-strength alloy, surrounds the stator iron core section and is contactless with the stator iron core section and a stator winding, and the bottom of the U-shaped detection coil is positioned in an air gap between a stator and a rotor. The invention further discloses a diagnosis method based on the device. By the device and the method, the defects of the prior art can be improved, and the diagnosis level of faults of this kind is raised.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a detection coil-based device and method for diagnosing a short circuit between turns of a turbine generator rotor. Background technique [0002] The rotor winding of the turbogenerator has a distributed structure, and the rotor winding is distributed in each slot of the rotor according to a certain rule. Usually, 7-10 turns of winding are placed in each slot, and the windings of the same slot are connected in series. Insulating layers are arranged between adjacent turns of windings. The windings of different slots of the rotor are also connected in series, relying on the insulating material in the slot and the end pads for insulation. [0003] Affected by factors such as manufacturing defects, improper operation and maintenance, generator participation in peak shaving, foreign matter entry, poor ventilation, centrifugal force and vibration, electrical faults are prone to occ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06
CPCG01R31/72
Inventor 武玉才马明晗董晨晨李永刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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