Dual-window temperature rise infrared collection and detection device for gas switchgear

Abstract

The present invention relates to a dual-window temperature-rise infrared collection and detection device for gas switchgear. Its main technical features are as follows: It includes a germanium glass probe, a bismuth-doped glass sheet, a pyroelectric detection array, a fixing member, an airtight flange, and an aviation plug; the pyroelectric detection array is installed inside the ring-shaped fixing member, the bismuth-doped glass sheet and the germanium glass probe are located above the pyroelectric detection array and installed on the fixing member, and the focal plane of the germanium glass probe is in contact with the light-receiving surface of the pyroelectric detection array; power lines and signal feed lines are provided on the backplane of the pyroelectric detection array and are led out from the airtight flange through the aviation plug; the airtight flange fixes the germanium glass probe, the bismuth-doped glass sheet, and the pyroelectric detection array at the opening of the gas switchgear housing through the fixing member. The design of the present invention is reasonable, realizing the precise monitoring function of abnormal temperature rise at key positions inside the equipment, and having the advantages of small volume, large field of view, high sensitivity, etc.

Description

Technical Field

[0001] The present invention belongs to the field of gas-insulated power equipment, and relates to the insulation state monitoring of gas-insulated power equipment. In particular, it is a dual-window temperature-rise infrared collection and detection device for gas switchgear. Background Art

[0002] During the manufacturing, assembly, and transportation processes of gas-insulated equipment, it is inevitable to form thermal defects such as high resistance or poor electrical connection. Under the current-carrying state, it will cause continuous or intermittent abnormal heating, resulting in heat loss and thermal aging of the equipment. Abnormal heating inside gas-insulated equipment is an important cause of insulation deterioration and an external manifestation of insulation faults. By detecting abnormal heating, it is possible to detect and warn of internal thermal defects and thermal faults in gas switchgear.

[0003] Detecting through thermal radiation photons is a temperature-rise detection method with a relatively high confidence level. Compared with the existing thermocouple method, optical fiber temperature measurement method, and surface acoustic wave method, it has the advantages of being unaffected by on-site electromagnetic interference, non-contact, and long lifespan. Cooperating with a thermal photon sensitive response device can achieve an extremely high signal-to-noise ratio. The existing optical detection methods that can be used for abnormal heating detection of equipment insulation mainly include the fiber Bragg grating detection method and the infrared spot temperature detection method. Among them, the fiber Bragg grating detection method is to place an optical fiber into the heating element inside the equipment for collection, and then guide it to the outside to connect with the optoelectronic conversion and signal processing system. This method is restricted by the limited light-receiving area of the optical fiber and has low sensitivity; the infrared spot temperature detection uses spot temperature focusing to convert thermal radiation into a charge signal. Generally speaking, although the current optical abnormal heating measurement sensors can limit non-optical interference, their sensitivity and viewing angle range are limited and they have not been widely used in actual equipment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a dual-window temperature-rise infrared collection and detection device for gas switchgear, which solves the problems of small viewing angle range, low sensitivity, and the need for contact measurement in the detection of abnormal heating of equipment insulation.

[0005] The present invention solves its technical problems by adopting the following technical solutions:[[]]END]]

[0006] A dual-window temperature-rise infrared collection and detection device for gas switchgear, comprising a germanium glass probe, a bismuth-doped glass sheet, a pyroelectric detection array, a fixing member, an airtight flange, and an aviation plug; the pyroelectric detection array is installed inside the ring fixing member, the bismuth-doped glass sheet is located above the pyroelectric detection array and installed on the fixing member, the germanium glass probe is located above the bismuth-doped glass sheet and installed on the fixing member, and the focal plane of the germanium glass probe is in contact with the light-receiving surface of the pyroelectric detection array; a power line and a signal feeder are provided on the back plate of the pyroelectric detection array and led out from the airtight flange through the aviation plug; the airtight flange fixes the germanium glass probe, the bismuth-doped glass sheet, and the pyroelectric detection array at the opening of the gas switchgear housing through the fixing member.

[0007] Moreover, the airtight flange is made of aluminum alloy material.

[0008] Moreover, the airtight flange is fixedly connected to the gas switchgear through a rubber sealing ring and screws.

[0009] Moreover, the germanium glass probe is a Fresnel lens made of optical-grade germanium crystal material. Preferably, the germanium glass Fresnel lens is a circular or hemispherical Fresnel lens, and the focal length is in the range of 3 mm to 9 mm.

[0010] Moreover, the selected optical-grade germanium crystal material has an average light transmittance of not less than 50% / mm in the range of 0.9 microns to 10 microns.

[0011] Moreover, the bismuth-doped glass sheet is sintered from bismuth ion-doped glass material, and the bismuth-doped glass sheet is used to increase the infrared fluorescence intensity. Preferably, the fluorescence excitation wavelength range of the bismuth-doped glass is 0.65 microns to 1.2 microns.

[0012] Moreover, the pyroelectric detection array includes two pyroelectric detection units with band-pass filtering characteristics and pre-amplification functions, and its band-pass filtering spectral response range is in the range of 0.9 microns to 10 microns, and the diameter of the light-receiving surface is not less than 4 mm.

[0013] Moreover, the fixing member is made of epoxy resin material.

[0014] Moreover, the aviation plug is a multi-core sealed aviation plug.

[0015] The advantages and positive effects of the present invention are:

[0016] 1. The design of the present invention is reasonable. It adopts a double-window endoscope structure with a Fresnel infrared lens and a pyroelectric detection array, which can be conveniently installed inside gas-insulated equipment to conduct endoscope detection on abnormal heating inside gas switchgear, realizing the precise monitoring function of abnormal temperature rise at key positions inside the equipment. During the monitoring process, it does not affect the insulation safety of the gas switchgear, and has the advantages of small volume, large field of view, high sensitivity, etc.

[0017] 2. The present invention realizes the function of wide-angle detection of weak light radiation emitted by abnormal heating inside gas-insulated equipment, which has practical significance for improving the operation and maintenance and condition detection quality of gas switchgear in substations, discovering heating faults, shortening the time for discovering equipment accidents, avoiding major operation accidents, and ensuring the stable operation of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a schematic structural diagram of the airtight flange of the present invention;

[0020] Figure 3 is a schematic diagram of the working principle of the present invention;

[0021] Among them, 1: germanium glass probe, 2: bismuth-doped glass sheet, 3: pyroelectric detection array, 4: epoxy resin fixing part, 5: airtight flange, 6: aviation plug, 7: O-ring seal, 8: screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further details the present invention with reference to the accompanying drawings.

[0023] A double-window temperature rise infrared collection and detection device for gas switchgear, as Figure 1 shown, includes a germanium glass probe 1, a bismuth-doped glass sheet 2, a pyroelectric detection array 3, an epoxy resin fixing part 4, an airtight flange 5, and an aviation plug 6. The pyroelectric detection array 3 is installed inside the epoxy resin fixing part 4. The bismuth-doped glass sheet 2 is located above the pyroelectric detection array 3 and installed on the epoxy resin fixing part 4. The germanium glass probe 1 is located above the bismuth-doped glass sheet 2 and installed on the epoxy resin fixing part 4. The focal plane of the germanium glass probe 1 is in contact with the light-receiving surface of the pyroelectric detection array 3. A power line and a signal feeder are provided on the backplane of the pyroelectric detection array 3. The above power line and signal feeder are led out from the airtight flange 5 through a multi-core sealed aviation plug 6, so as to connect the power lines and signal lines on both the inside and outside.

[0024] As Figure 2As shown, the airtight flange 5 is made of aluminum alloy material. The germanium glass probe 1, bismuth-doped glass sheet 2, and pyroelectric detection array 3 are fixed at the opening of the gas switchgear housing through an epoxy resin fixing part 4, and are fixedly connected to the detected gas switchgear by a rubber sealing ring 7 and screws 8.

[0025] In this embodiment, the germanium glass probe 1 is a Fresnel lens made of optical-grade germanium crystal material. The selected optical-grade germanium crystal material has a light transmittance of not less than 50% / mm in the range of 0.9 microns to 10 microns; the main functions of the germanium glass double-arc surface structure convex lens are mid- and far-infrared photon collection and dual-spectrum intensity correction.

[0026] The bismuth-doped glass sheet 2 is made by sintering bismuth ion-doped glass material, and its main function is to enhance the fluorescence intensity in the mid-infrared spectral region and improve the sensitivity of the detection device.

[0027] The pyroelectric detection array 3 includes 2 pyroelectric detection units with band-pass filtering characteristics and pre-amplification functions. Its band-pass filtering spectral response range is included in the range of 0.9 microns to 10 microns, and the diameter of the photosensitive surface is not less than 4 mm.

[0028] The epoxy resin fixing part 4 is made of epoxy resin material and is used to fix the germanium glass probe, bismuth-doped glass sheet, pyroelectric detector and its backplane, and has high electrical insulation performance and light-shielding performance; at the same time, the epoxy resin fixing part is used to keep the focal plane of the germanium glass probe in contact with the light-receiving surface of the pyroelectric detection array, so as to obtain the maximum field of view.

[0029] As Figure 3 shown, the working principle of the present invention is: collecting internal thermal photons of the device through a wide-angle Fresnel double-window lens, and improving the infrared fluorescence intensity through a bismuth-doped glass sheet; by fitting the focal plane of the germanium glass probe with the light-receiving surface of the pyroelectric detection array, the infrared fluorescence enters the pyroelectric detection array through two filters respectively, and voltage amplification signals capable of characterizing the spectral intensities of the near-infrared and mid-infrared bands in the range of 0.9 microns to 10 microns are obtained respectively, and the temperature rise of the device is further calculated through the voltage difference of the dual-band spectral intensities.

[0030] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific embodiments. Any other embodiments obtained by those skilled in the art according to the technical solutions of the present invention also belong to the scope of protection of the present invention.

Claims

1. A dual-window temperature rise infrared collection and detection device for gas switchgear, characterized in that: It includes a germanium glass probe, a bismuth-doped glass sheet, a pyroelectric detection array, a fixing member, an airtight flange, and an aviation plug; the pyroelectric detection array is installed inside the annular fixing member, the bismuth-doped glass sheet is located above the pyroelectric detection array and installed on the fixing member, the germanium glass probe is located above the bismuth-doped glass sheet and installed on the fixing member, and the focal plane of the germanium glass probe is in contact with the light-receiving surface of the pyroelectric detection array; power lines and signal feed lines are provided on the backplane of the pyroelectric detection array and led out from the airtight flange through the aviation plug; the airtight flange fixes the germanium glass probe, the bismuth-doped glass sheet, and the pyroelectric detection array at the opening of the gas switchgear housing through the fixing member; The germanium glass probe is a Fresnel lens made of optical-grade germanium crystal material. The Fresnel lens is a circular or hemispherical Fresnel lens with a focal length in the range of 3 mm to 9 mm, and the average light transmittance of the optical-grade germanium crystal material is not less than 50% / mm in the range of 0.9 microns to 10 microns; The bismuth-doped glass sheet is made by sintering bismuth ion-doped glass material; The pyroelectric detection array includes two pyroelectric detection units with band-pass filtering characteristics and pre-amplification functions. The band-pass filtering spectral response range of the pyroelectric detection unit is in the range of 0.9 microns to 10 microns, and the diameter of the light-receiving surface is not less than 4 mm.

2. The dual-window temperature rise infrared collection and detection device for gas switchgear according to claim 1, characterized in that: The airtight flange is made of aluminum alloy material; 3. The dual-window temperature rise infrared collection and detection device for gas switchgear according to claim 1 or 2, characterized in that: The airtight flange is fixedly connected to the gas switchgear through a rubber sealing ring and screws; 4. The dual-window temperature rise infrared collection and detection device for gas switchgear according to claim 1, characterized in that: The fixing member is made of epoxy resin material; 5. The dual-window temperature rise infrared collection and detection device for gas switchgear according to claim 1, characterized in that: The aviation plug is a multi-core sealed aviation plug; 6. The dual-window temperature rise infrared collection and detection device for gas switchgear according to claim 1, characterized in that: The fluorescence excitation wavelength range of the bismuth-doped glass is 0.65 microns to 1.2 microns.

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