Dynamic grounding fault searching method of generator rotor

Abstract

The invention relates to a dynamic grounding fault searching method of a generator rotor. The method comprises the following steps: S1, disassembling a magnetic pole lead at a magnetic pole joint, isolating a disassembling point, and dividing a rotor magnetic pole into a positive pole section and a negative pole section by taking the disassembling point as a boundary; S2, pressurizing the positivepole section and / or the negative pole section through a megger, and starting a unit to gradually increase the rotating speed until a dynamic grounding fault point is broken through to form a permanent grounding fault point; S3, reducing the number of magnetic poles of the positive pole section or the negative pole section connected to the megger one by one until a monitoring result of a rotor insulation monitoring device indicates that the insulation is qualified, and determining the last isolated magnetic pole as a ground fault point; and S4, connecting all the other magnetic poles except the magnetic pole where the grounding fault point determined in the S3 is located in the positive pole section or the negative pole section, and repeating the S2 and S3 until all the grounding fault points are found out. Therefore, a fault point can be accurately found, and safe and stable operation of equipment is ensured.

Description

technical field [0001] The invention relates to the field of power grid operation and maintenance, in particular to a dynamic ground fault finding method for a generator rotor. Background technique [0002] The generator set includes multiple rotor poles, and there are weak insulation points on the poles due to reasons such as operation and environment. During the operation of the generator set, the rotor rotates. Affected by factors such as centrifugal, vibration, and swing, the insulation weak point and the rotor Breakdown occurs intermittently, but this kind of breakdown does not exist in the static state. The existing rotor insulation monitoring and positioning device is difficult to accurately locate the ground fault point that only exists in the dynamic state, which affects Economic benefits of power plants. Contents of the invention [0003] In order to solve the above problems, a method for finding a dynamic ground fault of a generator rotor is provided, which inc...

AI Technical Summary

Problems solved by technology

[0002] The generator set includes multiple rotor poles, and there are weak insulation points on the poles due to reasons such as operation and environment. During the operation of the generator set, the rotor rotates. Affected by factors such as centrifugal, vibration, and swing, the insulation weak point and the rotor Breakdown occurs intermittently, but this kind of breakdown does not exist in the static state. The existing rotor insulation monitoring and positioning device is difficult to accurately locate the ground fault point that only exists in the dynamic state, which affects Economic Benefits of Power Plants

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