Method for measuring insulating state of generator rotor winding to iron core and shaft system

A generator rotor and insulation measurement technology, applied in the direction of testing dielectric strength, etc., can solve the problem of inability to effectively and accurately measure the insulation state of generator rotor windings

Active Publication Date: 2016-01-20
山西漳电科学技术研究院(有限公司)
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the insulation state of the generator rotor winding cannot be effectively and accurately measured at p

Method used

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  • Method for measuring insulating state of generator rotor winding to iron core and shaft system
  • Method for measuring insulating state of generator rotor winding to iron core and shaft system
  • Method for measuring insulating state of generator rotor winding to iron core and shaft system

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Embodiment Construction

[0035] figure 2 The circuit structure shown is a measuring device for realizing the measuring method of the present invention, and the measuring device includes a program controller, a first photoelectric switch S1, a second photoelectric switch S2, a first bypass switch T1, and a second bypass switch T2 , the first switch Q1 and the second switch Q2, one end of the rotor winding is connected to a free end of the first switch Q1, the other end of the rotor winding is connected to a free end of the second switch Q2, the first switch The common end of Q1 is connected to one end of the first bypass switch T2, the other end of the first bypass switch T2 is connected to one end of the first photoelectric switch S1, and the other end of the first photoelectric switch S1 is connected to the ground current through the current limiting resistor R1 One end of the rotor winding of the sensor is connected, the common end of the second switch Q2 is connected to one end of the second bypas...

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Abstract

The present invention relates to the field of generator rotor winding insulation measurement, and specifically, a method for measuring the insulating state of a generator rotor winding to an iron core and a shaft system. The method includes the steps as follows: establishing a measuring power source of the generator rotor winding to an insulation object; inputting the measuring power source with positive-negative intervals through an electronic switch; measuring the leak current of a rotor to the insulating object under the normal circumstance; setting a safe threshold value according to the leak current; identifying the detection value and the preset insulating resistance value when the monitored current exceeds the preset threshold value; comparing the detection value with the preset insulating resistance value through a plurality of interval measuring values; and emitting the alarm (I section high resistance) instruction or shut down (II section low resistance) instruction when the plurality of interval measuring values exceed the preset value. According to the invention, the generator rotor is protected.

Description

technical field [0001] The invention relates to the field of insulation measurement of generator rotor windings, in particular to a method for measuring the insulation of generator rotor windings to iron cores and shafting. Background technique [0002] The generator is an important equipment for the operation of the grid. The generator rotor converts primary energy into secondary energy and transmits it to the grid through the magnetic field established by the rotor winding current. The generator rotor is subjected to vibration, centrifugal force, electromagnetic force and harmonics and other factors that damage the insulation of the rotor winding during high-speed rotation. Therefore, the insulation of the rotor winding is the weak link in the overall level of generator insulation. In the past, in the protection of monitoring the generator rotor grounding, the sampling resistor voltage measurement device was generally used, and there were inaccurate measurements due to int...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 文生元吴晓明杨德荣苏波
Owner 山西漳电科学技术研究院(有限公司)
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