GIS partial discharge acoustic-optical-electric combined detection composite sensor and detection method

Abstract

The GIS partial discharge acoustic-optical-electric combined detection composite sensor comprises a composite sensing device installed on a GIS, and the composite sensing device comprises a sealing plate, a dielectric layer plate, an upper polar plate, an optical fiber connector, a fluorescent optical fiber, a feed rod and a limiting device; the limiting device comprises a fixed ring seat, a rotating mechanism, a synchronizing mechanism and an adjustable limiting mechanism; the fixed ring seat is fixedly mounted on the lower surface of the sealing plate; the rotating mechanism is rotationally arranged at the bottom of the fixed ring seat; the synchronizing mechanism is rotationally arranged in the fixed ring seat; the adjustable limiting mechanism is arranged on the edge of the fixing ring base in a sliding and penetrating mode and meshed with the synchronizing mechanism. Through the adjustable limiting mechanism, the position of the sliding limiting seat is reasonably adjusted according to the thickness of the head of the bolt, so that it is guaranteed that the adjusted sliding limiting seat can make contact with and press the head of the bolt, using is more flexible, the signal conditioning amplifier and the photoelectric converter are matched, and the problem of false alarm of partial discharge is solved.

Description

Technical Field

[0001] The invention belongs to the field of composite sensors, and in particular relates to a composite sensor for joint acoustic-optical and electrical detection of local discharge in a GIS. Background Art

[0002] Gas-insulated switchgear (GIS) is the core equipment of the power grid with the highest occupancy and the fastest growth rate. Partial discharge is the most important parameter for GIS insulation status detection. At present, ultrasonic detection and ultra-high frequency detection methods are mainly used on site. However, long-term on-site engineering experience shows that the two single detection methods have obvious deficiencies in actual engineering applications. First of all, due to the limitation of the principle, both detection methods have certain detection blind spots in partial discharge detection: the ultrasonic method cannot detect defects that sound waves cannot transmit, such as internal defects of insulators; and the ultra-high frequency method has poor sensitivity to defects with low electromagnetic wave frequencies, such as surface discharge of insulators. The existence of detection blind spots leads to frequent "missing reports" of the two detection methods in on-site applications. In addition, the two methods mainly use external detection. Due to the limitation of the detection method, the ultra-high frequency detection method cannot detect partial discharge of gas-insulated equipment with shielding installed on insulators, and the ultrasonic method needs to be arranged on a relatively flat shell surface, resulting in severe restrictions on the detectable area. At the same time, the on-site electromagnetic environment is complex, and there are equipment vibrations and abnormal sound signals. When the two detection methods are applied on site, they are easily affected by external interference, resulting in "false alarms" during the detection process.

[0003] At present, the frequent "missed reports and false reports" of local discharge detection in GIS on-site seriously restrict the reliable operation of GIS equipment. The on-site detection effect can no longer meet the timeliness and accuracy requirements of local discharge defect detection. It is urgent to break through the bottleneck of existing methods and explore more effective detection and analysis methods. In the existing technology, the sensor is generally connected to the GIS equipment through bolts, but the GIS equipment is prone to vibration during use, which causes the bolts to loosen, resulting in poor sensor fitting effect, which will also affect the discharge detection effect of the sensor.

[0004] The prior art discloses a tension sensor for a transmission tower (CN217032841U), comprising a base plate, bolt holes are provided around the base plate, and fixing bolts penetrating the base plate are provided inside the bolt holes, a main body is installed at the middle position of the top of the base plate, the lower end of the fixing box is connected to a positive and negative threaded rod for transverse rotation, thread blocks are threadedly connected to the two sides of the surface of the positive and negative threaded rod, and a clamping plate extending to the upper end of the bolt hole is installed on the top of the thread block. However, the disadvantage of the prior art is that the positive and negative threaded rod is driven to rotate by turning the dial wheel, so that the thread block moves and drives the clamping plate to move and snap into the bolt hole, which can only limit the bolts at both ends of the rectangular part, and cannot extend and position the bolts in a circular array at the same time, and the head thickness of the existing bolts is different. The above utility model is not convenient for reasonably adjusting the position of the clamping plate according to the thickness of the bolt head, and is not flexible enough to use. Summary of the invention

[0005] The purpose of the present invention is to provide a composite sensor for joint acoustic, photoelectric and local discharge detection of GIS to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides a GIS partial discharge acoustic-photoelectric combined detection composite sensor, comprising:

[0008] A composite sensing device installed on GIS, the composite sensing device includes: a sealing plate, a dielectric layer plate, an upper pole plate, an optical fiber connector, a fluorescent optical fiber, a feeding rod and a limiting device; the dielectric layer plate is connected to the upper surface of the sealing plate; the upper pole plate is connected to the upper surface of the dielectric layer plate; the optical fiber connector is inserted and installed on the side of the sealing plate; the fluorescent optical fiber is embedded in the top of the upper pole plate and connected to the optical fiber connector; the feeding rod is inserted and installed in the middle of the sealing plate and the dielectric layer plate, and the top is connected to the upper pole plate, and the limiting device is installed on the lower surface of the sealing plate;

[0009] The limiting device includes: a fixed ring seat, a rotating mechanism, a synchronous mechanism, and an adjustable limiting mechanism; the fixed ring seat is fixedly installed on the lower surface of the sealing plate; the rotating mechanism is rotatably arranged at the bottom of the fixed ring seat; the synchronous mechanism is rotatably arranged inside the fixed ring seat; the adjustable limiting mechanism is slidably inserted at the edge of the fixed ring seat, and the adjustable limiting mechanism and the synchronous mechanism are engaged with each other, and the rotation of the rotating mechanism is used to synchronously drive the rotation of multiple synchronous mechanisms to realize the synchronous promotion of the telescopic movement of multiple adjustable limiting mechanisms.

[0010] Preferably, the sealing plate is a disc-shaped structure made of metal;

[0011] The rotating mechanism includes a gear ring, an elastic reset assembly and a push rod;

[0012] An annular groove is provided inside the fixed ring seat, and the gear ring is rotatably arranged inside the annular groove; a plurality of elastic reset components are connected to the inner side of the gear ring and are arranged in an annular array for elastically supporting the gear ring; a push rod is connected to the bottom end of the gear ring and is slidably and interlacedly connected with the fixed ring seat.

[0013] Preferably, the elastic reset assembly comprises an arc-shaped limit rod, an interlaced slider and a spring;

[0014] The inner wall of the annular groove is provided with a plurality of slide grooves in a circular array, an arc-shaped limit rod is fixedly installed inside the slide groove, and the center of the arc-shaped limit rod coincides with the center of the gear ring; an interlaced slider is fixedly connected to the inner side of the gear ring, and is slidably interlaced with the arc-shaped limit rod; a spring movable sleeve is arranged on the outside of the arc-shaped limit rod.

[0015] Preferably, the synchronization mechanism comprises a rotating shaft and a gear column;

[0016] The rotating shaft is arranged inside the fixed ring seat in a vertically rotatable manner; the gear column is inserted and arranged outside the rotating shaft, the bottom is meshed with the gear ring, and the top is meshed with the adjustable limiting mechanism.

[0017] Preferably, the adjustable limiting mechanism comprises a sliding limiting seat, a rack portion, a guide plate and an adjusting assembly;

[0018] The sliding limit seat is slidably connected with the fixed ring seat, and the extension line intersects with the axis of the fixed ring seat; the rack part is integrated at the side of the sliding limit seat and meshes with the gear column; the guide plate is slidably connected with the sliding limit seat and is vertically slidably arranged inside the fixed ring seat; the adjustment component is threadedly connected with the guide plate and is used to adjust the height of the guide plate.

[0019] Preferably, the adjustment assembly includes a rotating rod, a rotating screw, a synchronous wheel and a synchronous belt;

[0020] The rotating rod is rotatably interlaced with the bottom of the fixed ring seat; the rotating screw is connected to one end of the rotating rod, and is threadably interlaced with the guide plate through the nut seat, and is respectively interlaced at both ends of the guide plate; the synchronous wheel is connected to the other end of the rotating rod; and the synchronous belt is arranged between the synchronous wheels.

[0021] Preferably, a handle is connected to the synchronous wheel;

[0022] The top and the bottom of the sliding limit seat are both provided with a through slot, and one of the rotating screw rods is slidably and interlacedly connected with the inner cavity of the through slot.

[0023] Preferably, it also includes a signal collector, a signal conditioning amplifier, a photoelectric converter, a high-frequency coaxial cable, a transmission optical fiber and a connecting cable; the signal collector and the composite sensing device are electrically connected to the signal conditioning amplifier and the photoelectric converter, respectively; the signal collector is electrically connected to the signal conditioning amplifier and the photoelectric converter, respectively, through the connecting cable, the signal conditioning amplifier is connected to the composite sensing device through the high-frequency coaxial cable, and the photoelectric converter is electrically connected to the composite sensing device through the transmission optical fiber.

[0024] Preferably, the end of the transmission optical fiber is electrically connected to the optical fiber connector; the bottom of the feeding rod is connected to a UHF connector, and the UHF connector is electrically connected to the end of the high-frequency coaxial cable;

[0025] A base plate is installed at the bottom of the signal collector, and a bearing platform is installed on both sides of the base plate. The bearing platform is used to carry the signal conditioning amplifier and the photoelectric converter.

[0026] The second aspect of the present invention provides a detection method based on the above-mentioned GIS partial discharge acoustic-optical combined detection composite sensor, comprising:

[0027] Step 1, assemble the composite sensor and set it on the GIS;

[0028] Step 2, based on the composite sensor assembled and set in step 1, perform acoustic and optical joint detection on the GIS;

[0029] Step 3, based on the detection result of step 2, determine whether partial discharge occurs in the GIS. If no partial discharge occurs, store the detection result data; otherwise, issue a GIS partial discharge alarm;

[0030] Step 4: Based on the alarm issued in step 3, repair the GIS and eliminate the alarm.

[0031] Technical effects and advantages of the present invention:

[0032] (1) The present invention utilizes a configuration in which a sealing plate and a limiting device cooperate with each other. By pushing the rotating mechanism, the rotating mechanism is caused to rotate inside the fixed ring seat, thereby driving the rotation of multiple synchronous mechanisms engaged therewith, thereby driving the synchronous mechanisms to drive the storage movement of the adjustable limiting mechanisms engaged therewith, thereby enabling the multiple adjustable limiting mechanisms to be synchronously stored inside the fixed ring seat. Then, the external bolts can be passed through the sealing plate and threadedly connected to the GIS equipment, and synchronously pass through the fixed ring seat through the multiple adjustable limiting mechanisms, thereby facilitating simultaneous limiting of multiple bolts to prevent the bolts from loosening. At the same time, the adjustable limiting mechanism can be adjusted to achieve reasonable adjustment of the position of the sliding limiting seat according to the different thicknesses of the bolt heads, so as to ensure that the adjusted sliding limiting seat can contact and press the bolt heads, making it more flexible to use.

[0033] (2) The present invention utilizes a configuration method in which a signal conditioning amplifier and a photoelectric converter are coordinated. The coordinated use of the photoelectric converter and the signal conditioning amplifier can give full play to the advantages of the two local discharge detection methods, the optical detection method and the ultra-high frequency method, to achieve accurate detection of local discharge inside the GIS. The complementarity of the effectiveness of optical and ultra-high frequency detection methods for different defect detections can achieve full coverage of defect detection and solve the problem of "missed reporting" of local discharge on site. For example, both ultra-high frequency and ultrasonic methods are not sensitive to insulator defects, but the optical method can effectively detect these defects. The natural electromagnetic immunity characteristics of the optical detection method are used to make up for the shortcomings of ultrasonic and ultra-high frequency methods that are easily affected by on-site interference, solve the problem of "false alarm" of local discharge, improve the operating reliability of the GIS, and ensure the safe operation of the power grid.

[0034] (3) The present invention uses a configuration in which the optical fiber connector and the feed rod are matched, and when the composite sensing device is used to detect partial discharge inside the GIS, there are two channels, the ultra-high frequency signal channel and the optical signal channel. The ultra-high frequency signal is transmitted through a high-frequency coaxial cable, and then amplified and filtered by a signal conditioning amplifier before being measured by a signal collector; the optical signal is transmitted to a photoelectric converter using a transmission optical fiber, and then converted into an electrical signal and measured by a signal collector. The detection of partial discharge can be achieved by detecting the single physical signal of both light and electricity generated by partial discharge, making the detection more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0036] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the internal structure of the composite sensor of the present invention;

[0038] Figure 4 It is a schematic diagram of the internal structure of the limiting device of the present invention;

[0039] Figure 5 It is a schematic diagram of the top view of the adjustable limiting mechanism of the present invention;

[0040] Figure 6 It is a schematic diagram of the top view of the rotating mechanism of the present invention;

[0041] Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle;

[0042] Figure 8 It is a schematic diagram of the internal top view of the adjustable limiting mechanism of the present invention;

[0043] Fig. 9It is a schematic diagram of the internal front structure of the adjustable limiting mechanism of the present invention;

[0044] Fig.10 It is a schematic diagram of the top view structure of the fluorescent optical fiber of the present invention;

[0045] Fig.11 This is the discharge signal diagram of the present invention when the voltage is 53kV;

[0046] Fig.12 This is the discharge signal diagram of the present invention when the voltage is 69kV;

[0047] Fig.13 This is the discharge signal diagram of the present invention when the voltage is 90kV.

[0048] In the figure: 1, signal collector; 2, signal conditioning amplifier; 3, photoelectric converter; 4, composite sensor device; 41, sealing plate; 42, dielectric layer plate; 43, upper plate; 44, optical fiber connector; 45, fluorescent optical fiber; 46, feeding rod; 47, limit device; 471, fixed ring seat; 472, rotating mechanism; 4721, gear ring; 4722, elastic reset component; 47221, arc limit rod; 47222, interlaced slider; 47 223. Spring; 4723. Push rod; 473. Synchronous mechanism; 4731. Rotating shaft; 4732. Gear column; 474. Adjustable limit mechanism; 4741. Sliding limit seat; 4742. Rack portion; 4743. Guide plate; 4744. Adjustment assembly; 47441. Rotating rod; 47442. Rotating screw; 47443. Synchronous wheel; 47444. Synchronous belt; 5. High-frequency coaxial cable; 6. Transmission optical fiber; 7. Connecting cable. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The present invention provides Figure 1-13The GIS partial discharge acoustic-optical combined detection composite sensor shown includes: a signal collector 1, a signal conditioning amplifier 2, a photoelectric converter 3, a composite sensing device 4, a high-frequency coaxial cable 5, a transmission optical fiber 6 and a connecting cable 7. The signal collector 1 is electrically connected to the signal conditioning amplifier 2 and the photoelectric converter 3 respectively; the signal collector 1 is electrically connected to the signal conditioning amplifier 2 and the photoelectric converter 3 respectively through the connecting cable 7, the composite sensing device 4 is electrically connected to the signal conditioning amplifier 2 and the photoelectric converter 3 respectively, the composite sensing device 4 is installed on the GIS, the signal conditioning amplifier 2 is electrically connected to the composite sensing device 4 through the high-frequency coaxial cable 5, and the photoelectric converter 3 is electrically connected to the composite sensing device 4 through the transmission optical fiber 6.

[0051] The coordinated use of the photoelectric converter 3 and the signal conditioning amplifier 2 can give full play to the advantages of the two local discharge detection methods, the optical measurement method and the ultra-high frequency method, to achieve accurate detection of local discharge inside the GIS. The complementarity of the effectiveness of optical and ultra-high frequency detection methods for different defect detections can achieve full coverage of defect detection and solve the problem of "missed reporting" of local discharge on site. For example, both ultra-high frequency and ultrasonic methods are not sensitive to insulator defects, but the optical method can effectively detect such defects. The natural electromagnetic immunity characteristics of the optical detection method are used to make up for the shortcomings of ultrasonic and ultra-high frequency methods that are easily affected by on-site interference, solve the problem of "false alarm" of local discharge, improve the operating reliability of GIS, and ensure the safe operation of the power grid. When using the composite sensor device 4 to detect local discharge inside the GIS, there are two channels, the ultra-high frequency signal channel and the optical signal channel. The ultra-high frequency signal is transmitted through the high-frequency coaxial cable 5, and then amplified and filtered by the signal conditioning amplifier 2 before being measured by the signal collector 1; the optical signal is transmitted to the photoelectric converter 3 using the transmission optical fiber 6, and is converted into an electrical signal and measured by the signal collector 1. The detection of partial discharge can be achieved by detecting the single physical signal of both light and electricity generated by partial discharge, making the detection more flexible.

[0052] Furthermore, the composite sensing device 4 includes: a sealing plate 41, a dielectric layer plate 42, an upper electrode plate 43, an optical fiber connector 44, a fluorescent optical fiber 45, a feeding rod 46 and a limiting device 47, wherein the sealing plate 41 is a disc-shaped metal material; the dielectric layer plate 42 is connected to the upper surface of the sealing plate 41; the upper electrode plate 43 is connected to the upper surface of the dielectric layer plate 42; the optical fiber connector 44 is inserted and installed on the side of the sealing plate 41, and the end of the transmission optical fiber 6 is electrically connected to the optical fiber connector 44; Fig.10As shown, the fluorescent optical fiber 45 is spirally embedded in the top of the upper pole plate 43, and one end of the fluorescent optical fiber 45 is connected to the optical fiber connector 44; the feeding rod 46 is inserted and installed in the middle of the sealing plate 41 and the dielectric layer plate 42, and the top of the feeding rod 46 is connected to the upper pole plate 43, and the bottom of the feeding rod 46 is connected to the ultra-high frequency connector, and the end of the high-frequency coaxial cable 5 is electrically connected to the ultra-high frequency connector; the limiting device 47 is installed on the lower surface of the sealing plate 41, and is used to limit multiple bolts at the same time. In a preferred but non-restrictive embodiment of the present invention, a filter is provided inside the signal conditioning amplifier 2, and a bandpass filter of 200MHz to 1500MHz is used to filter the signal of the ultra-high frequency channel, while eliminating the interference of low-frequency corona discharge signals and high-frequency communication signals in the air on the detection results.

[0053] In addition, the discharge signal under most defects is small and needs to be amplified, so the signal is amplified by a signal conditioning amplifier 2 with an amplification gain of 20dB. The signal of the fluorescent fiber channel is first transmitted to the photoelectric converter 3 through the transmission optical fiber 6, and then the electrical signal obtained after the photoelectric conversion is transmitted to the signal collector 1 through the connecting cable 7.

[0054] In a preferred but non-limiting embodiment of the present invention, the transmission optical fiber 6 uses a PMMA ordinary plastic optical fiber with a diameter of 1 mm, which matches the diameter of the fluorescent optical fiber 45 used for detection, and reduces the loss caused by transmission as much as possible. The light signal generated by partial discharge is extremely weak, so a photomultiplier tube PMT with strong amplification ability is selected as the photoelectric converter 3. The photomultiplier tube module is small in size and only needs to supply a voltage source of ±5V or +5V when in use. The external circuit is simple and very suitable for field applications. Since the emission spectrum of the fluorescent optical fiber 45 is 422nm~605nm, and the fluorescent optical fiber 45 uses the Hamamatsu H10722 series photomultiplier tube module as the subsequent photoelectric conversion module, its detection spectrum range is 230nm~870nm, and this type of photomultiplier tube module has an internal integrated 1V / μA current-voltage converter.

[0055] The partial discharge signal under typical defects was tested on the physical equipment. The partial discharge signal detection results under the guide rod spike defect are as follows: Figure 11-13 As shown in the figure. For the guide rod spike defect, when the voltage increases to 53kV, the fluorescent fiber channel first detects the discharge signal, while the UHF channel does not detect the discharge signal. Fig.11 When the voltage is further increased to 69kV, the UHF channel of the composite sensor begins to detect signals, as shown in Fig.12 When the external voltage is high, both the fluorescent fiber and the UHF channel of the composite sensor detect strong discharge signals, such as Fig.13As shown. It can be seen that for the guide rod spike defect, the fluorescent fiber optic method has higher detection sensitivity than the UHF method.

[0056] Further, such as Figure 1-Figure 2 As shown, a base plate is installed at the bottom of the signal collector 1, and supporting platforms are installed on both sides of the base plate. The supporting platforms are used to support the signal conditioning amplifier 2 and the photoelectric converter 3.

[0057] Specifically, Figure 4-Figure 5 As shown, the limiting device 47 includes: a fixed ring seat 471, a rotating mechanism 472, a synchronous mechanism 473 and an adjustable limiting mechanism 474. The fixed ring seat 471 is fixedly installed on the lower surface of the sealing plate 41; the rotating mechanism 472 is rotatably arranged at the bottom of the fixed ring seat 471; a plurality of synchronous mechanisms 473 are rotatably arranged inside the fixed ring seat 471, and the plurality of synchronous mechanisms 473 are arranged in a ring array; a plurality of adjustable limiting mechanisms 474 are slidably interspersed at the edge of the fixed ring seat 471, and the plurality of adjustable limiting mechanisms 474 are arranged in a ring array, and the adjustable limiting mechanisms 474 and the synchronous mechanisms 473 are meshed with each other, and the rotation of the rotating mechanism 472 is used to synchronously drive the rotation of the plurality of synchronous mechanisms 473 Rotate to realize synchronously pushing the telescopic movement of multiple adjustable limiting mechanisms 474, and by pushing the rotating mechanism 472, the rotating mechanism 472 is rotated inside the fixed ring seat 471, thereby promoting the rotation of multiple synchronous mechanisms 473 engaged therewith, so that the synchronous mechanism 473 pushes the storage movement of the adjustable limiting mechanisms 474 engaged therewith, so that the multiple adjustable limiting mechanisms 474 can be synchronously stored in the fixed ring seat 471, and then the external bolts can be passed through the sealing plate 41 and threadedly connected to the GIS equipment, and synchronously pass through the fixed ring seat 471 through the multiple adjustable limiting mechanisms 474, so as to facilitate the simultaneous limitation of multiple bolts to prevent the bolts from loosening.

[0058] Specifically, Figure 4 , Figure 6As shown, the rotating mechanism 472 includes: a gear ring 4721, an elastic reset component 4722 and a push rod 4723. An annular groove is provided inside the fixed ring seat 471, and the gear ring 4721 is rotatably arranged inside the annular groove; multiple elastic reset components 4722 are connected to the inner side of the gear ring 4721, and the elastic reset components 4722 are arranged in an annular array, and the elastic reset components 4722 are used to elastically support the gear ring 4721; the push rod 4723 is connected to the bottom end of the gear ring 4721, and the push rod 4723 is slidably connected with the fixed ring seat 471. By pushing the push rod 4723, the push rod 4723 can push the gear ring 4721, so that the gear ring 4721 rotates at the bottom of the fixed ring seat 471, so that the rotation of the gear ring 4721 can simultaneously promote the synchronous rotation of multiple gear columns 4732.

[0059] like Figure 7 As shown, the elastic reset component 4722 includes: an arc-shaped limit rod 47221, an interlaced slider 47222 and a spring 47223. The inner side wall of the annular groove is provided with a plurality of slide grooves in an annular array. The arc-shaped limit rod 47221 is fixedly installed inside the slide groove, and the center of the arc-shaped limit rod 47221 coincides with the center of the gear ring 4721; the interlaced slider 47222 is fixedly connected to the inner side of the gear ring 4721, and the interlaced slider 47222 is slidably interlaced with the arc-shaped limit rod 47221; the spring 47223 is movably sleeved on the outside of the arc-shaped limit rod 47221. When the gear ring 4721 rotates, it will synchronously drive the synchronous rotation of the plurality of interlaced sliders 47222. The sliding and interlacing between the limiting rod 47221 and the interlaced slider 47222 facilitates the limiting of the sliding of the interlaced slider 47222, making the sliding of the interlaced slider 47222 more stable. When the interlaced slider 47222 slides in the direction of the spring 47223, the spring 47223 will be squeezed and deformed, thereby facilitating further compression of the spring 47223. When the external force applied to the push rod 4723 is relaxed, the elastic support of the interlaced slider 47222 by the spring 47223 can reset the position of the gear ring 4721, so that the adjustable limiting mechanism 474 remains in a protruding state relative to the fixed ring seat 471, thereby limiting the nut inserted on the sealing plate 41.

[0060] Further, such as Figure 8As shown, the synchronization mechanism 473 includes: a rotating shaft 4731 and a gear column 4732. The rotating shaft 4731 is vertically rotatably arranged inside the fixed ring seat 471; the gear column 4732 is inserted and arranged outside the rotating shaft 4731, and the bottom of the gear column 4732 is meshed with the gear ring 4721, and the top of the gear column 4732 is meshed with the adjustable limiting mechanism 474. Through the limitation of the rotating shaft 4731, the rotation of the gear column 4732 inside the fixed ring seat 471 is more stable. By the way that the gear column 4732 is meshed with the rack part 4742 and the gear ring 4721 at the same time, the rotation of the gear ring 4721 can simultaneously promote the linear motion of multiple rack parts 4742.

[0061] Further, such as Figure 8-Figure 9 As shown, the adjustable limiting mechanism 474 includes: a sliding limiting seat 4741, a rack portion 4742, a guide plate 4743 and an adjusting assembly 4744. The sliding limiting seat 4741 is slidably interlaced with the fixed ring seat 471, and the extension line of the sliding limiting seat 4741 intersects with the axis of the fixed ring seat 471; the rack portion 4742 is integrally arranged on the side of the sliding limiting seat 4741, and the rack portion 4742 and the gear column 4732 are meshed with each other; the guide plate 4743 is slidably interlaced with the sliding limiting seat 4741, and the guide plate 4743 is vertically slidably arranged inside the fixed ring seat 471; the adjusting assembly 4744 and the guide plate 4743 are connected. 743 threaded insertion connection, the adjustment component 4744 is used to adjust the height of the guide plate 4743, and it passes through the sliding limit seat 4741 relative to the fixed ring seat 471 to be in a protruding state, so as to facilitate the extrusion and limitation of the position of the bolt head inserted on the sealing plate 41 to prevent the bolt from loosening, and through the engagement between the rack part 4742 and the gear column 4732, it is convenient to convert the form of movement, and convert the rotation of the gear column 4732 into the linear motion of the rack part 4742, and through the sliding insertion between the guide plate 4743 and the sliding limit seat 4741, the insertion and sliding of the sliding limit seat 4741 is made more stable.

[0062] Furthermore, the adjustment component 4744 includes: a rotating rod 47441, a rotating screw 47442, a synchronous wheel 47443 and a synchronous belt 47444. The rotating rod 47441 is rotatably and interlacedly connected with the bottom of the fixed ring seat 471; the rotating screw 47442 is connected to one end of the rotating rod 47441, and the rotating screw 47442 is threadedly and interlacedly connected with the guide plate 4743 through a nut seat, and the rotating screw 47442 is respectively interlaced and arranged at both ends of the guide plate 4743; the synchronous wheel 47443 is connected to the other end of the rotating rod 47441, and a handle is connected to one of the synchronous wheels 47443; the synchronous belt 47444 is arranged between the synchronous wheels 47443. The top and bottom of the sliding limit seat 4741 are provided with a through slot, and one of the rotating screw rods 47442 is slidably and interlaced with the inner cavity of the through slot. By turning the handle, the handle drives a synchronous wheel 47443 to rotate, and is connected between the two synchronous wheels 47443 through a synchronous belt 47444, so as to facilitate the synchronous rotation of the two synchronous wheels 47443, and also make the rotating rod 47441 can rotate synchronously, so as to drive the synchronous rotation of the two rotating screw rods 47442. Through the threaded interlacing between the rotating screw rod 47442 and the guide plate 4743, the threaded interlacing of the rotating screw rod 47442 can stably drive the guide plate 4743 to move up and down, so as to adjust the height of the sliding limit seat 4741 relative to the fixed ring seat 471, so as to adjust the position of the sliding limit seat 4741 according to the thickness of the bolt head.

[0063] The embodiment of the present invention further provides a detection method based on the above-mentioned GIS partial discharge acoustic-optical combined detection composite sensor, including:

[0064] Step 1, assemble the composite sensor and set it on the GIS;

[0065] Step 2, based on the composite sensor assembled and set in step 1, perform acoustic and optical joint detection on the GIS;

[0066] Step 3, based on the detection result of step 2, determine whether partial discharge occurs in the GIS. If no partial discharge occurs, store the detection result data; otherwise, issue a GIS partial discharge alarm;

[0067] Step 4: Based on the alarm issued in step 3, repair the GIS and eliminate the alarm.

[0068] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A GIS partial discharge acoustic-optical combined detection composite sensor, characterized in that: include: A composite sensing device (4) installed on a GIS, the composite sensing device (4) comprising: a sealing plate (41), a dielectric layer plate (42), an upper pole plate (43), an optical fiber connector (44), a fluorescent optical fiber (45), a feeding rod (46) and a limiting device (47); the dielectric layer plate (42) is connected to the upper surface of the sealing plate (41); the upper pole plate (43) is connected to the upper surface of the dielectric layer plate (42); the optical fiber connector (44) is inserted and installed on the side of the sealing plate (41); the fluorescent optical fiber (45) is embedded in the top of the upper pole plate (43) and connected to the optical fiber connector (44); the feeding rod (46) is inserted and installed in the middle of the sealing plate (41) and the dielectric layer plate (42), and the top is connected to the upper pole plate (43); the limiting device (47) is installed on the lower surface of the sealing plate (41); The limiting device (47) comprises: a fixed ring seat (471), a rotating mechanism (472), a synchronous mechanism (473), and an adjustable limiting mechanism (474); the fixed ring seat (471) is fixedly installed on the lower surface of the sealing plate (41); the rotating mechanism (472) is rotatably arranged at the bottom of the fixed ring seat (471); the synchronous mechanism (473) is rotatably arranged inside the fixed ring seat (471); the adjustable limiting mechanism (474) is slidably inserted at the edge of the fixed ring seat (471), the adjustable limiting mechanism (474) and the synchronous mechanism (473) are meshed with each other, and the rotation of the rotating mechanism (472) is used to synchronously drive the rotation of multiple synchronous mechanisms (473) to achieve synchronous promotion of the telescopic movement of multiple adjustable limiting mechanisms (474).

2. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 1 is characterized in that: The sealing plate (41) is a disc-shaped structure made of metal; The rotating mechanism (472) includes a gear ring (4721), an elastic reset assembly (4722) and a push rod (4723); An annular groove is provided inside the fixed ring seat (471), and the gear ring (4721) is rotatably arranged inside the annular groove; a plurality of elastic reset components (4722) are connected to the inner side of the gear ring (4721) and are arranged in an annular array for elastically supporting the gear ring (4721); a push rod (4723) is connected to the bottom end of the gear ring (4721) and is slidably connected to the fixed ring seat (471).

3. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 2 is characterized in that: The elastic reset assembly (4722) comprises an arc-shaped limiting rod (47221), an interlaced sliding block (47222) and a spring (47223); The inner wall of the annular groove is provided with a plurality of slide grooves in an annular array, an arc-shaped limit rod (47221) is fixedly installed inside the slide groove, and the center of the arc-shaped limit rod (47221) coincides with the center of the gear ring (4721); an interlaced slider (47222) is fixedly connected to the inner side of the gear ring (4721) and is slidably interlaced with the arc-shaped limit rod (47221); and a spring (47223) is movably sleeved on the outside of the arc-shaped limit rod (47221).

4. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 2 is characterized in that: The synchronization mechanism (473) includes a rotating shaft (4731) and a gear column (4732); The rotating shaft (4731) is vertically rotatably arranged inside the fixed ring seat (471); the gear column (4732) is inserted and arranged outside the rotating shaft (4731), the bottom is meshed with the gear ring (4721), and the top is meshed with the adjustable limit mechanism (474).

5. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 1 is characterized by: The adjustable limiting mechanism (474) comprises a sliding limiting seat (4741), a rack portion (4742), a guide plate (4743) and an adjusting assembly (4744); The sliding limit seat (4741) is connected to the fixed ring seat (471) by sliding and inserting, and the extension line intersects with the axis of the fixed ring seat (471); the rack portion (4742) is integrally arranged on the side of the sliding limit seat (4741) and meshes with the gear column (4732); the guide plate (4743) is connected to the sliding limit seat (4741) by sliding and inserting, and is vertically slidably arranged inside the fixed ring seat (471); the adjustment component (4744) is threadedly connected to the guide plate (4743) and is used to adjust the height of the guide plate (4743).

6. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 5 is characterized by: The adjustment assembly (4744) includes a rotating rod (47441), a rotating screw (47442), a synchronous wheel (47443) and a synchronous belt (47444); The rotating rod (47441) is rotatably connected with the bottom of the fixed ring seat (471); the rotating screw (47442) is connected to one end of the rotating rod (47441), and is threadably connected with the guide plate (4743) through a nut seat, and is respectively inserted at both ends of the guide plate (4743); the synchronous wheel (47443) is connected to the other end of the rotating rod (47441); and the synchronous belt (47444) is arranged between the synchronous wheels (47443).

7. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 6 is characterized by: A handle is connected to the synchronous wheel (47443); The top and bottom of the sliding limit seat (4741) are both provided with a through slot, and a rotating screw rod (47442) is slidably inserted and connected with the inner cavity of the through slot.

8. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 1 is characterized by: It also includes a signal collector (1), a signal conditioning amplifier (2), a photoelectric converter (3), a high-frequency coaxial cable (5), a transmission optical fiber (6) and a connecting cable (7); the signal collector (1) and the composite sensor device (4) are electrically connected to the signal conditioning amplifier (2) and the photoelectric converter (3) respectively; The signal collector (1) is electrically connected to the signal conditioning amplifier (2) and the photoelectric converter (3) respectively through a connecting cable (7); the signal conditioning amplifier (2) is connected to the composite sensing device (4) through a high-frequency coaxial cable (5); and the photoelectric converter (3) is electrically connected to the composite sensing device (4) through a transmission optical fiber (6).

9. The GIS partial discharge acoustic-optical combined detection composite sensor according to claim 8 is characterized in that: The end of the transmission optical fiber (6) is electrically connected to the optical fiber connector (44); the bottom of the feeding rod (46) is connected to a UHF connector, and the UHF connector is electrically connected to the end of the high-frequency coaxial cable (5); A base plate is installed at the bottom of the signal collector (1), and a bearing platform is installed on both sides of the base plate. The bearing platform is used to carry the signal conditioning amplifier (2) and the photoelectric converter (3).

10. A detection method based on the GIS partial discharge acoustic-optical combined detection composite sensor according to any one of claims 1 to 9, characterized in that: include: Step 1, assemble the composite sensor and set it on the GIS; Step 2, based on the composite sensor assembled and set in step 1, perform acoustic and optical joint detection on the GIS; Step 3, based on the detection result of step 2, determine whether partial discharge occurs in the GIS. If no partial discharge occurs, store the detection result data; otherwise, issue a GIS partial discharge alarm; Step 4: Based on the alarm issued in step 3, repair the GIS and eliminate the alarm.

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