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Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors

A technology of strain sensor and transformer winding, applied in the direction of electric winding test, optical device, instrument, etc., can solve the problems of inability to achieve online monitoring, inability to achieve direct monitoring, etc., to achieve direct, clear and accurate measurement results, and to ensure normal safety The effect of running and reducing delay

Active Publication Date: 2017-05-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both the short-circuit impedance method and the frequency response method need to arrange a power outage of the equipment for testing, and online monitoring cannot be achieved
Although the vibration monitoring method can be monitored online, this method reflects the vibration of the winding and then the deformation of the winding by monitoring the vibration on the wall of the oil tank. It cannot be directly monitored and is easily affected by the operation mode, manufacturing process, environment and temperature changes of the transformer.

Method used

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  • Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors
  • Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors
  • Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors

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Effect test

Embodiment 1

[0025] Because the winding is in the transformer oil, the current general fiber grating strain sensor cannot adapt to the transformer oil environment and cannot meet the life requirement of at least 10 years. This invention uses a kind of rubber with excellent oil resistance - nitrile rubber to package the fiber grating , in order to meet its lifetime requirements, the package structure such as image 3 As shown, the nitrile rubber can be processed into different shapes and sizes according to the specific position, so that it can meet the space requirements and be loaded into the transformer winding press shoe and wire cake.

Embodiment 2

[0027] figure 2 It is a single-phase structure diagram of the transformer winding. In the figure a is the single-phase structure of the transformer winding. The pressure shoe 10 is located at the bottom of the winding to isolate the winding so that it is not directly grounded; the stay 9 is located between the winding and the inner winding and the iron core between the inner and outer windings, the inner winding and the iron core, as the interlayer support and insulation of the winding, and form the heat dissipation oil passage or air passage; the pad 11 is the insulator between the coil and the coil in a single winding, as For support and insulation (as shown in the figure b is the partial AA enlarged schematic diagram of the winding); a slot is longitudinally opened on the stay 9 between the inner winding and the iron core. To the bottom, install the sensors corresponding to the positions of the upper, middle and lower windings respectively. There are 3 stays on each phase...

Embodiment 3

[0032] For the winding online monitoring system, the implementation is as follows:

[0033] The winding on-line monitoring system used in the present invention is as figure 1 As shown, it includes: M-Z interferometer, coupler, wave splitter, photodetector, signal processing unit, and industrial computer.

[0034] The broadband light source emits a light wave with a stable bandwidth, which is injected into the optical fiber, and the strain around the quasi-distributed fiber grating sensor changes, so that the wavelength of the reflected light wave changes.

[0035] The coupler couples the reflected waves of different wavelengths into the M-Z interferometer; the M-Z interferometer divides the light into two beams and passes through two arms with different optical paths to complete the interference to obtain interference light.

[0036] The wave splitter divides the interfering light into different lights according to wavelengths and transmits them to the photodetector respectiv...

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Abstract

The present invention discloses a transformer winding deformation on-line monitoring system by employing fiber grating strain sensors belonging to the power transformer safety monitoring technical field. The broadband light source of the system is connected with a coupler and an M-Z interferometer, and the back portion of the coupler is connected in series with 1-n fiber grating strain sensors; the back portion of the M-Z interferometer is connected in series with a wave separator, a photoelectric detector, a signal processing unit and an industrial control computer in order; and after the system allows the optical signals after the grating reflection to perform interference through the M-Z interferometer, the optical signals are subjected to phase modulation, the light after the interference through the wave separator is separated according to the wave length and enters the photoelectric detector so as to convert to electric signals, and the electric signals are processed through the signal processing unit and are transmitted to the industrial control computer. The fiber grating strain sensors can perform online monitoring of axial deformation conditions between coils to realize the whole axial direction deformation of the transformer winding.

Description

technical field [0001] The invention belongs to the technical field of power transformer safety monitoring, in particular to an online monitoring system for transformer winding deformation using an optical fiber grating strain sensor. [0002] technical background [0003] The power transformer is an important equipment in the power generation, transmission and distribution system. Its performance and quality are directly related to the reliability and operational efficiency of the power system operation. The winding is an important part of the transformer. [0004] After the transformer winding carries current, an axial and radial leakage magnetic field will be established in the space where it is located and its surrounding space; the winding itself in this magnetic field will be affected by the "Lorentz force" or electromagnetic force , the electromagnetic force produces mechanical stress in the transformer winding material and is partially transmitted to other components ...

Claims

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Application Information

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IPC IPC(8): G01R31/06G01B11/16
CPCG01B11/165G01R31/72
Inventor 王伟刘世远高超飞王鹏宋树童中宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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