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Steam turbine generator rotor turn-to-turn short circuit diagnosis device and method based on detection coil

A technology of steam turbine generator and detection coil, applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problem of low feasibility, and achieve the effects of high sensitivity, good adaptability and high reliability

Active Publication Date: 2017-05-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

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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

Method used

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  • Steam turbine generator rotor turn-to-turn short circuit diagnosis device and method based on detection coil
  • Steam turbine generator rotor turn-to-turn short circuit diagnosis device and method based on detection coil
  • Steam turbine generator rotor turn-to-turn short circuit diagnosis device and method 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 an inter-turn short circuit diagnosis device and method of a steam turbine generator rotor based on a detection coil. Background technique [0002] The rotor winding of the turbo-generator is a distributed structure. The rotor windings are distributed in each slot of the rotor according to a certain rule. Usually, 7-10 turns of windings are placed in each slot. An insulating layer is arranged between adjacent turns of the 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, electricity is prone to occur between the upper and lower layers of the rotor winding a...

Claims

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Application Information

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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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