Searching method forrotor magnetic pole grounding point searching instrument
A technology of rotor magnetic poles and grounding points, applied in the field of detection, can solve problems such as increasing equipment downtime, rotor intrusion, and grounding faults
Active Publication Date: 2020-09-11
STATE GRID CORP OF CHINA +1
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Problems solved by technology
The cooling water pipelines of the upper and lower guide bearings of the generator, various monitoring devices and their cables create a complex environment in the wind tunnel, and at the same time, the rotor magnetic poles and magnetic pole connection lines are exposed to operation
If the environmental management of the wind tunnel is not strict, it is very easy to cause the rotor to cause a ground fault due to foreign matter intrusion
[0003] After the rotor is grounded, if the fault point is obvious, the operation and maintenance personnel can find and deal with the defect in time; if the fault point is relatively hidden, it will be more difficult for the operation and maintenance personnel to find the fault point, and the time to deal with the defect will also increase correspondingly, increasing Equipment downtime
Method used
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[0016] Below in conjunction with embodiment, further illustrate the present invention.
[0017] see figure 1 It can be seen that a search method of a rotor magnetic pole grounding point finder of the present invention comprises the following steps:
[0018] (1) Connect the DC resistance tester in series with all rotor poles r1-r13, where r1-r13 means that there are 13 rotor poles in total;
[0019] (2) One end of the wire is connected to one end of the No. 1 magnetic pole, and the other end of the wire is connected to any ground point and the fault ground point r13 to form a circuit. At this time, the grounding resistor R1 is connected in parallel to the entire circuit of the rotor magnetic pole. Assume that the ground point is at the No. 7 magnetic pole At x=7, the entire rotor has a total of 13 magnetic poles; at this time, the data measured by the DC resistance tester:
[0020]
[0021] (4) Then change one end of the wire from No. 1 magnetic pole to No. 2 magnetic pole...
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The invention discloses a searching method for a rotor magnetic pole grounding point searching instrument. The method comprises the following steps of (1), enabling a DC resistance tester to be in series connection with all rotor magnetic poles r1-r13, r1-r13 representing that the number of the rotor magnetic poles is 13,(2) connecting one end of a wire to one end of the first magnetic pole, the other end of the wire to any grounding point to form a loop with the fault grounding point r13, andat the moment, enabling the DC resistance tester to measure data Cr1,(3) replacing one end of the wirefrom the first magnetic pole to the second magnetic pole, andat the moment, enabling the DC resistance tester to measure data Cr2, and (4) sequentially connecting one end of the wire to the next magnetic pole, sequentially measuring Cr3, Cr4, Cr5... by the DC resistance tester, and taking the maximum position of Cr7 measured by the DC resistance tester as the grounding position of the rotor magnetic pole. According to the method, the fault point can be simply, safely and quickly found.
Description
technical field [0001] The invention relates to a detection method, in particular to a method for finding a rotor magnetic pole grounding point finder. Background technique [0002] The generator rotor is mainly composed of magnetic poles, yokes, arms, and central body, among which the magnetic poles are important components of the electromagnetic conversion of the generator. Generally, the generator rotor has many magnetic poles, and each magnetic pole is connected by a magnetic pole connection line. The magnetic poles and the connecting wires of the magnetic poles constitute a complex electrical circuit. The generator operates in a strong magnetic and high temperature environment. The cooling water pipes of the upper and lower guide bearings of the generator, various monitoring devices and their cables create a complex environment in the wind tunnel, and at the same time, the rotor magnetic poles and magnetic pole connection lines are exposed to operation. If the enviro...
Claims
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Login to View More IPC IPC(8): G01R31/52
CPCG01R31/52Y02E10/72
Inventor 李扬帆刘皓月苏小娟李赫明
Owner STATE GRID CORP OF CHINA