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

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...

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