Transformer vibration monitoring sensor device based on a distributed feedback laser

Abstract

Disclosed is a transformer vibration monitoring sensor device based on a distributed feedback laser, wherein the U-shaped support has a horizontal section for support and first and second vertical sections extending vertically upward from both ends of the horizontal section; the distributed feedback laser is fixed at the top of the first vertical section and the top of the second vertical section under a predetermined tensile stress applied at both ends; and the transformer vibration monitoring sensor device based on the distributed feedback laser adjusts the vibration frequency response range through the size of the tension.

Description

Technical Field

[0001] This invention belongs to the field of transformer vibration monitoring technology, and in particular, a transformer vibration monitoring sensing device based on a distributed feedback laser. Background Technology

[0002] Fiber optic sensors offer advantages such as small size, light weight, resistance to electromagnetic interference, high sensitivity, and suitability for applications in flammable and explosive environments. The application range of fiber optic vibration sensing technology is very wide. In power systems, its main applications include measuring electrical parameters, online monitoring of electrical equipment, and on-site testing, such as monitoring the operating status of transformers, generators, and transmission lines.

[0003] Power transformers are among the most important electrical devices in power systems. According to statistics from the State Grid Corporation of China, from 2002 to 2006, 162 transformers at voltage levels of 110kV and above experienced accidents. Most of these were winding faults, including permanent instability deformations such as winding twisting, tilting, collapse, bulging, and displacement. Transformer vibration monitoring uses a vibration method to monitor the transformer's condition, ensuring linearity of monitoring while simultaneously monitoring both its structural and electrical states. Experiments have shown that this method can be widely applied to various types of transformers with a fault monitoring accuracy of 80%–90%.

[0004] Most current transformer vibration monitoring equipment uses electrical sensors, which are difficult to apply to transformer oil.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention proposes a transformer vibration monitoring sensing device based on a distributed feedback laser, which can be placed in transformer oil to monitor the vibration information of the transformer core and windings.

[0007] The objective of this invention is achieved through the following technical solution: a transformer vibration monitoring and sensing device based on a distributed feedback laser includes,

[0008] The U-shaped bracket has a horizontal section for support and a first vertical section and a second vertical section extending vertically upward from both ends of the horizontal section.

[0009] A distributed feedback laser, with its two ends fixed to the top of the first vertical segment and the top of the second vertical segment respectively under a predetermined tensile stress.

[0010] The top of the first vertical section and the top of the second vertical section are flush.

[0011] The DFB laser-based transformer vibration monitoring sensor device is immersed in transformer oil, and when the transformer core or winding vibrates, the DFB laser generates vibration and changes the wavelength of the light emitted.

[0012] The DFB laser-based transformer vibration monitoring sensor device further comprises an interferometer for converting the wavelength change into a phase change.

[0013] The DFB laser-based transformer vibration monitoring sensor device further comprises a phase demodulator connected to the interferometer to demodulate the vibration signal.

[0014] The DFB laser-based transformer vibration monitoring sensor device further comprises an interferometer for converting the wavelength change into a phase change.

[0015] The DFB laser-based transformer vibration monitoring sensor device further comprises an interferometer for converting the wavelength change into a phase change.

[0016] Compared with the prior art, the present application has the following advantages: the DFB laser is attached to the U-shaped bracket at both ends, and the DFB laser is equivalent to a string, which is placed in the transformer oil. When the transformer core or winding vibrates, the DFB laser generates vibration, causing a change in its length, and further changing the wavelength of the light emitted. The wavelength change is converted into a phase change by the interferometer, and finally the wavelength information is demodulated by the phase demodulation system, and the vibration signal is obtained. The device is resistant to electromagnetic interference, has high sensitivity, large bandwidth, small size, light weight, and can adjust the vibration frequency response range by the size of the tension. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits of the present application will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiment. The accompanying drawings are included to provide a better understanding of the preferred embodiment, and are not to be considered limitations of the present application. It should be readily understood that the drawings are merely illustrative of the present application and that they, therefore, do not limit the present application to the principles of the preferred embodiment described herein. Rather, this embodiment is intended to demonstrate the inventive aspects of the present application. Further, the same reference numerals in the drawings indicate the same or similar components.

[0018] In the drawings:

[0019] Figure 1This is a schematic diagram of a transformer vibration monitoring and sensing device based on a distributed feedback laser according to an embodiment of the present invention.

[0020] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0021] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0022] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0023] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0024] To better understand, such as Figure 1 As shown, the transformer vibration monitoring sensing device based on a distributed feedback laser includes,

[0025] U-shaped bracket 1 has a horizontal section 4 for support and a first vertical section 5 and a second vertical section 6 extending vertically upward from both ends of the horizontal section 4.

[0026] The distributed feedback laser 2 is fixed at both ends to the top of the first vertical segment 5 and the top of the second vertical segment 6 respectively under a predetermined tensile stress.

[0027] In a preferred embodiment of the transformer vibration monitoring sensing device based on a distributed feedback laser, the top of the first vertical segment 5 and the top of the second vertical segment 6 are flush.

[0028] In the preferred embodiment of the transformer vibration monitoring sensor device based on the distributed feedback laser, the transformer vibration monitoring sensor device based on the distributed feedback laser is immersed in the transformer oil, and when the transformer core or winding vibrates, the distributed feedback laser 2 generates vibration and changes the wavelength of the light emitted thereby.

[0029] In the preferred embodiment of the transformer vibration monitoring sensor device based on the distributed feedback laser, the transformer vibration monitoring sensor device based on the distributed feedback laser further comprises an interferometer for converting the change in wavelength into a change in phase.

[0030] In the preferred embodiment of the transformer vibration monitoring sensor device based on the distributed feedback laser, the transformer vibration monitoring sensor device based on the distributed feedback laser further comprises a phase demodulator connected to the interferometer to demodulate the vibration signal.

[0031] In the preferred embodiment of the transformer vibration monitoring sensor device based on the distributed feedback laser, the distributed feedback laser 2 is adhered to the top of the first vertical section 5 and the top of the second vertical section 6 via ultraviolet glue.

[0032] In the preferred embodiment of the transformer vibration monitoring sensor device based on the distributed feedback laser, the U-shaped bracket 1 is a U-shaped groove.

[0033] In one embodiment, the top of the first vertical section 5 and the top of the second vertical section 6 are respectively provided with slidable clamping members 3 for fixing the distributed feedback laser 2, and the distance between the two clamping members 3 is adjusted based on a predetermined tensile stress.

[0034] In one embodiment, the U-shaped bracket 1 is a symmetrical structure.

[0035] In one embodiment, the distributed feedback laser 2 is adhered to the U-shaped groove, and a certain tension is applied to the ends of the distributed feedback laser 2 before adhesion, and then the ends of the distributed feedback laser 2 are fixed to the U-shaped groove with epoxy resin. The distributed feedback laser 2 is equivalent to a string, and when the tension is different, the natural frequency is different, and by adjusting the tension before adhesion, a DFB vibration sensor head with different response frequencies can be prepared. Placing the vibration sensor head in the transformer oil can monitor the vibration information of the transformer core and winding. Different frequencies of vibration information can be responded to by different tensions during adhesion. When the tension is different, the natural frequency is different, and by adjusting the tension before adhesion, a transformer vibration monitoring sensor device based on the distributed feedback laser with different response frequencies can be prepared. Placing the vibration sensor head in the transformer oil can monitor the vibration information of the transformer core and winding.

[0036] Although the embodiments of the present application have been described above with reference to the accompanying drawings, the present application is not limited to the above-described specific embodiments and areas of application, and the above-described specific embodiments are merely illustrative and instructive, but are not restrictive. Many modifications can be made by those skilled in the art under the teachings of the present specification and without departing from the scope of the present application as defined by the claims.

Claims

1. A transformer vibration monitoring sensor arrangement based on a distributed feedback laser, characterized by It comprises: a U-shaped bracket having a horizontal section for support and a first vertical section and a second vertical section extending vertically upward from both ends of the horizontal section; a distributed feedback laser fixed at the top of the first vertical section and the top of the second vertical section respectively under a predetermined tensile stress, the transformer vibration monitoring sensor device based on the distributed feedback laser is immersed in transformer oil, when the transformer core or winding vibrates, the distributed feedback laser generates vibration and in turn changes the wavelength of the light emitted, further comprising an interferometer for converting the change of wavelength into the change of phase, further comprising a phase demodulator connected to the interferometer to demodulate the vibration signal, the top of the first vertical section and the top of the second vertical section are respectively provided with a slidable clamping piece for fixing the distributed feedback laser, the distance between the two clamping pieces is adjusted by sliding based on the predetermined tensile stress.

2. The distributed feedback laser based transformer vibration monitoring sensor apparatus of claim 1, wherein, The top of the first vertical section and the top of the second vertical section are flush.

3. The distributed feedback laser based transformer vibration monitoring sensor apparatus of claim 1, wherein, The distributed feedback laser is adhered to the top of the first vertical section and the top of the second vertical section via ultraviolet glue.

4. The distributed feedback laser based transformer vibration monitoring sensor apparatus of claim 1, wherein, The U-shaped bracket is a U-shaped groove.

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