A generator rotor insulation on-line monitoring grounding locating method and device

A generator rotor and positioning method technology, which is applied to online monitoring of the generator rotor insulation status, the device for realizing the method, and the field of diagnosing the grounding position of the generator rotor can solve the problems of insulated state monitoring, early warning, low monitoring accuracy, and inability to Meet the online monitoring requirements and other issues to achieve the effect of shortening maintenance time and improving economic benefits

Active Publication Date: 2009-10-07
贵阳新光电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its application is used as two-point grounding protection, and it is not used as a grounding position judgment. Even if it is used as a grounding position judgment, it cannot automatically give the specific physical location of the ground fault point and insulation deterioration point, such as a certain number of magnetic poles grounded, or If a certain coil is grounded or a certain connection of them is grounded, the on-site maintenance personnel must spend a lot of time to check the data and calculate, which directly affects the economic benefits of the power plant
[0004] 2) Since the rotor grounding alarm signal is issued only when the insulation resistance drops below tens of kilohms,

Method used

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  • A generator rotor insulation on-line monitoring grounding locating method and device
  • A generator rotor insulation on-line monitoring grounding locating method and device
  • A generator rotor insulation on-line monitoring grounding locating method and device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1, such as figure 2 As shown, the method of the present invention is realized through the following steps:

[0041] (1) Obtain the relative positioning value α according to the resistance switching sampling method;

[0042] (2) According to the number of coil groups g, the number of turns J, and the circumference D of each group of coils in the rotor winding of the turbo-generator i , Calculate the percentage of each group of coil wires to the length of the rotor winding wire β i And the position of the connection of each group of coils γ i :

[0043] β i = L i / L

[0044] γ i = Σ i = 1 n β i (n=i)

[0045] Among them, the length of each group of coil wires is L i =JD i , The total length of the rotor winding wire is L = Σ i ...

Example Embodiment

[0052] Example 2, such as image 3 As shown, the method of the present invention can also be implemented through the following steps:

[0053] (1) Obtain the relative positioning value α according to the resistance switching sampling method;

[0054] (2) According to the total number of magnetic poles g and the number of turns J in the rotor winding of the hydroelectric generator, calculate the percentage β of each magnetic pole to the total number of magnetic poles and the position γ of the connection of each magnetic pole i :

[0055] β = 1 / g

[0056] i=β i

[0057] Among them, i is the magnetic pole number;

[0058] (2) Compare and analyze the above calculation results with the relative positioning value α, and make the following judgments on the specific physical location of the ground fault:

[0059] ①If γ i-1 i , It indicates that the rotor winding is grounded at the i-th magnetic pole;

[0060] ②If k=(α-γ i-1 )J / β, it indicates that the rotor winding is grounded at the k-th...

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PUM

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Abstract

The invention discloses a generator rotor insulation on-line monitoring grounding locating method and device, which pertains to the generator rotor grounding monitoring protection technology and is object to provided a method and device capable of rapid judging the grounding positions. The method calculates the relative locating value alpha according to the resistor switch sampling method, figures out beta[i] (beta ) and gamma [i] based on the rotor winding structural parameters, and accurately judge the physical position of faults by analysis. The device includes a microcomputer, a rotor voltage measuring circuit and a resistance network, wherein, the resistance network (4) is connected to the large axis (1-3) through a non-excited conversion circuit (5) and a switched voltage measuring circuit (8), a voltage injecting signal circuit (13) is connected between windings cathode (1-2 ) and the non-excited conversion circuit (5), the non-excited conversion circuit (5) and the photoelectric isolation switch (3) are connected to the microcomputer (6), and the rotor voltage measuring circuit (2) and the switched voltage measuring circuit (8) are connected to the microcomputer (6) through an A/D conversion buffer circuit (7).

Description

Technical field: [0001] The invention relates to an on-line monitoring grounding location method, in particular to a method for on-line monitoring the insulation condition of a generator rotor and diagnosing the grounding position of the generator rotor; the invention also relates to a device for realizing the method. Background technique: [0002] The generator rotor is an important part of the generator. It is usually composed of a large shaft and a winding arranged on the large shaft and insulated from it. Since the winding and the large shaft must be insulated, the insulation of the winding will directly affect the quality of the winding. It is related to the safe and normal operation of the generator, and the rapid diagnosis of the ground fault point can directly improve the economic benefit of the generator. At present, the following problems exist in the protection and monitoring of the generator rotor grounding: [0003] 1) In the prior art, the resistance network d...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R31/02
Inventor 曾广
Owner 贵阳新光电气有限公司
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