CN115792518A - Device for detecting partial discharge acoustic radiation signals in switch cabinet - Google Patents
Device for detecting partial discharge acoustic radiation signals in switch cabinet Download PDFInfo
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- CN115792518A CN115792518A CN202211443947.0A CN202211443947A CN115792518A CN 115792518 A CN115792518 A CN 115792518A CN 202211443947 A CN202211443947 A CN 202211443947A CN 115792518 A CN115792518 A CN 115792518A
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- optical fiber
- sound pressure
- pressure sensor
- demodulation system
- switch cabinet
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- 239000013307 optical fiber Substances 0.000 claims abstract description 34
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- 229920001684 low density polyethylene Polymers 0.000 claims description 14
- 239000004702 low-density polyethylene Substances 0.000 claims description 14
- 238000002310 reflectometry Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
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- 238000004544 sputter deposition Methods 0.000 description 1
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Abstract
The invention relates to a device for detecting a partial discharge sound radiation signal in a switch cabinet, which comprises an optical fiber F-P sound pressure sensor and a demodulation system, wherein the optical fiber F-P sound pressure sensor is connected with the demodulation system through a single-mode optical fiber; the demodulation system comprises a light source, a coupler, a photoelectric converter and a control chip, wherein the light source is used for emitting 1550nm laser signals, and the 1550nm laser signals enter the optical fiber F-P sound pressure sensor after passing through the coupler; and F-P cavity reflected light of the optical fiber F-P sound pressure sensor passes through the coupler and then is fed into the photoelectric converter to be converted into a voltage signal, and the control chip is used for processing the voltage signal to obtain a sound pressure amplitude value. By the aid of the method, the device and the system, the partial discharge sound radiation signals in the switch cabinet can be detected, and then latent arc light faults can be judged.
Description
Technical Field
The invention relates to the technical field of switch cabinet detection, in particular to a device for detecting partial discharge sound radiation signals in a switch cabinet.
Background
The switch board is the most common switch class equipment in the distribution network, and environmental parameter changes or the electric wire netting is undulant easily to take place arc discharge when equipment divide-shut brake, and permanent injury direct influence distribution network safety can be caused to equipment to the harm that arc discharge produced. However, due to the extreme randomness of the arc discharge, it is difficult for the conventional monitoring method to capture the occurrence of arc faults. Along with the city scale enlargement, for the promotion of electric power safety and electric wire netting stability, find the arc light trouble fast and monitor and report to the police and be vital to the safety of switch board and the stability of whole distribution network. According to statistics, arc short circuit accounts for a higher proportion of major faults of the distribution network in recent years, and instantaneous arc sputtering generated after the short circuit fault can cause system breakdown and even fire accidents.
Disclosure of Invention
The invention aims to provide a device for detecting an partial discharge sound radiation signal in a switch cabinet, which is used for detecting the partial discharge sound radiation signal in the switch cabinet so as to judge a latent arc fault.
In order to achieve the above object, the present invention provides a device for detecting an acoustic radiation signal in a local discharge in a switch cabinet, the device comprising an optical fiber F-P acoustic pressure sensor and a demodulation system, wherein the optical fiber F-P acoustic pressure sensor and the demodulation system are connected by a single mode optical fiber; the demodulation system comprises a light source, a coupler, a photoelectric converter and a control chip, wherein the light source is used for emitting a 1550nm laser signal, and the 1550nm laser signal enters the optical fiber F-P sound pressure sensor after passing through the coupler; and F-P cavity reflected light of the optical fiber F-P sound pressure sensor passes through the coupler and then is fed into the photoelectric converter to be converted into a voltage signal, and the control chip is used for processing the voltage signal to obtain a sound pressure amplitude value.
Preferably, the control chip is further configured to determine whether partial discharge occurs in the switch cabinet according to the sound pressure amplitude, and determine whether a latent arc fault exists according to a determination result.
Preferably, the optical fiber F-P sound pressure sensor comprises a glass base, wherein antireflection films are plated on two sides of the glass base, a low-density polyethylene film is melt-bonded on the surface of one side of the glass base through heating, and a 1550nm light high-reflectivity film is plated on the surface of the low-density polyethylene film; the surface of the other side of the glass base is adhered with a glass sleeve with a through hole of 125um in diameter by epoxy, the glass sleeve is inserted into a fiber pigtail, the pigtail is polished into a plane, the plane is parallel to the glass base and the high-reflectivity film surface of the low-density polyethylene, and the end face of the fiber pigtail and the high-reflectivity film surface of the low-density polyethylene are plated to form an F-P cavity.
Preferably, the demodulation system further comprises a driving circuit for driving the light source to emit a 1550nm laser signal.
Preferably, the demodulation system further comprises a temperature control circuit for small frequency range adjustment of the wavelength of the 1550nm laser.
The invention has at least the following beneficial effects:
the invention is based on the fact that the arc fault of the switch cabinet is detected through an optical fiber F-P sound pressure sensor to detect the partial discharge sound radiation signal in the switch cabinet, and then the latent arc fault is judged, an advanced technology is provided for an operation and maintenance unit to avoid the occurrence of sudden faults, and the economic loss is reduced.
Additional features and advantages of the invention will be set forth in the description which follows.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for detecting an acoustic radiation signal in a partial discharge in a switch cabinet according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an optical fiber F-P sound pressure sensor according to an embodiment of the present invention.
Fig. 3 is a reflection spectrum diagram of an optical fiber F-P acoustic pressure sensor in an embodiment of the present invention.
Fig. 4 is a schematic diagram of an operating curve of a corresponding relationship between sound pressure and output in an embodiment of the present invention.
Detailed Description
The detailed description of the drawings is intended as a description of the presently preferred embodiments of the invention, and is not intended to represent the only forms in which the present invention may be practiced. It is to be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides an apparatus for detecting an acoustic radiation signal in a local discharge in a switch cabinet, where the apparatus includes an optical fiber F-P acoustic pressure sensor and a demodulation system, where the optical fiber F-P acoustic pressure sensor and the demodulation system are connected by a single mode optical fiber; the demodulation system comprises a light source, a coupler, a photoelectric converter and a control chip, wherein the light source is used for emitting a 1550nm laser signal, and the 1550nm laser signal enters the optical fiber F-P sound pressure sensor after passing through the coupler; and F-P cavity reflected light of the optical fiber F-P sound pressure sensor passes through the coupler and then is fed into the photoelectric converter to be converted into a voltage signal, and the control chip is used for processing the voltage signal to obtain a sound pressure amplitude value.
Further, the control chip is also used for judging whether partial discharge occurs in the switch cabinet according to the sound pressure amplitude value and determining whether a latent arc fault exists according to a judgment result.
Further, referring to fig. 2, the optical fiber F-P acoustic pressure sensor includes a glass substrate, both sides of the glass substrate are coated with an antireflection film, a surface of one side of the glass substrate is melt-bonded with a low density polyethylene film by heating, and a surface of the low density polyethylene film is coated with a 1550nm light high-reflectivity film; the surface of the other side of the glass base is adhered with a glass sleeve with a through hole of 125 microns in diameter by epoxy, the glass sleeve is inserted into a fiber pigtail, the pigtail is polished to be a plane, the plane is parallel to the glass base and the surface of the low-density polyethylene high-reflectivity film, and the end face of the fiber pigtail and the surface of the low-density polyethylene plated high-reflectivity film form an F-P cavity.
Further, the demodulation system further comprises a driving circuit, and the driving circuit is used for driving the light source to emit 1550nm laser signals.
Further, the demodulation system further comprises a temperature control circuit, and the temperature control circuit is used for adjusting the wavelength of the 1550nm laser in a small frequency range.
The working principle of the device of the embodiment of the invention is as follows:
the arc fault of the switch cabinet is accompanied by the prior partial discharge before occurring, and the partial discharge induces signals such as electromagnetic waves, ultrasonic waves and the like, so that various physical phenomena are accompanied at different stages of the arc fault, the partial discharge is a necessary condition for the arc fault, and the latent arc fault can be found by detecting the partial discharge ultrasonic waves.
In the embodiment, the optical fiber F-P sound pressure sensor is adopted to detect the latent arc fault in the switch cabinet, and the optical fiber F-P sound pressure sensor is required to be matched with a demodulation system shown in figure 1 to demodulate a sound pressure signal. The optical fiber F-P sound pressure sensor is connected with a demodulation system through a single mode optical fiber, 1550nm laser signals are emitted from a light source in the demodulation system under the action of a driving circuit, the 1550nm laser signals enter a sensor probe after passing through a coupler, F-P cavity reflected light of the optical fiber F-P sound pressure sensor is fed into a photoelectric converter after passing through the coupler to be converted into voltage signals, the voltage signals are acquired by data and then sent to a control chip, and the control chip can inversely calculate corresponding voltage signals into sound pressure amplitude values; meanwhile, the demodulation system utilizes a temperature control circuit to adjust the wavelength of the 1550nm laser in a small frequency range.
Specifically, a 1550nm laser signal enters a sensor probe through an optical fiber pigtail, and is reflected for multiple times in an F-P cavity formed by an end face of the optical fiber pigtail and a high-reflection film plated on a low-density polyethylene film, so that multi-beam interference is formed, the low-density polyethylene film deforms under the action of external partial discharge sound pressure, the length of the F-P cavity changes, and an interference spectrum reflected back through a cavity structure is modulated, at the moment, the change value of the cavity length can be calculated by detecting the change of a wave trough in the reflection spectrum, and the size of a sound pressure value can be analyzed from the change value, as shown in fig. 3-4, fig. 3 is a reflection spectrogram of the optical fiber F-P sound pressure sensor in the embodiment of the invention, and fig. 4 is a working curve of corresponding relation between sound pressure and a voltage amplitude.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (5)
1. A device for detecting a partial discharge sound radiation signal in a switch cabinet is characterized by comprising an optical fiber F-P sound pressure sensor and a demodulation system, wherein the optical fiber F-P sound pressure sensor and the demodulation system are connected through a single mode optical fiber; the demodulation system comprises a light source, a coupler, a photoelectric converter and a control chip, wherein the light source is used for emitting 1550nm laser signals, and the 1550nm laser signals enter the optical fiber F-P sound pressure sensor after passing through the coupler; and F-P cavity reflected light of the optical fiber F-P sound pressure sensor passes through the coupler and then is fed into the photoelectric converter to be converted into a voltage signal, and the control chip is used for processing the voltage signal to obtain a sound pressure amplitude value.
2. The apparatus according to claim 1, wherein the control chip is further configured to determine whether a partial discharge occurs in the switch cabinet according to the sound pressure amplitude, and determine whether a latent arc fault exists according to the determination result.
3. The device for detecting the partial discharge acoustic radiation signals in the switch cabinet according to claim 1 or 2, wherein the optical fiber F-P sound pressure sensor comprises a glass base, both sides of the glass base are coated with antireflection films, one side surface of the glass base is coated with a low-density polyethylene film through heating and fusion bonding, and the surface of the low-density polyethylene film is coated with a 1550nm light high-reflectivity film; the surface of the other side of the glass base is adhered with a glass sleeve with a through hole of 125um in diameter by epoxy, the glass sleeve is inserted into a fiber pigtail, the pigtail is polished into a plane, the plane is parallel to the glass base and the high-reflectivity film surface of the low-density polyethylene, and the end face of the fiber pigtail and the high-reflectivity film surface of the low-density polyethylene are plated to form an F-P cavity.
4. The apparatus according to claim 3, wherein the demodulation system further comprises a driving circuit, and the driving circuit is configured to drive the light source to emit a 1550nm laser signal.
5. The apparatus of claim 4, wherein the demodulation system further comprises a temperature control circuit for small frequency range tuning of the wavelength of the 1550nm laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211443947.0A CN115792518A (en) | 2022-11-18 | 2022-11-18 | Device for detecting partial discharge acoustic radiation signals in switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211443947.0A CN115792518A (en) | 2022-11-18 | 2022-11-18 | Device for detecting partial discharge acoustic radiation signals in switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115792518A true CN115792518A (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211443947.0A Pending CN115792518A (en) | 2022-11-18 | 2022-11-18 | Device for detecting partial discharge acoustic radiation signals in switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115792518A (en) |
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- 2022-11-18 CN CN202211443947.0A patent/CN115792518A/en active Pending
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