Composite sensor for GIS partial discharge detection

Abstract

The utility model belongs to the technical field of GIS partial discharge detection, and particularly relates to a composite sensor for GIS partial discharge detection, which comprises a cover plate, an ultrasonic sensing assembly, an ultrahigh frequency sensing assembly and an optical sensing assembly, the ultrasonic induction optical fiber is annularly coiled in the annular groove, and the two ends of the ultrasonic induction optical fiber are connected with the two ST optical fiber connectors respectively; the ultrahigh frequency sensing assembly comprises a sealing base, a sealing compression ring, a mushroom head probe and an N-type connector, an insertion spring and a mandrel are arranged in the sealing base and the sealing compression ring respectively, and the N-type connector, the insertion spring, the mandrel and the mushroom head probe are connected in sequence; the optical sensing assembly comprises a fluorescent optical fiber and an optical fiber penetrating device which are connected, a spiral groove is formed in the lower end face of the mushroom head probe, and the fluorescent optical fiber is spirally wound in the spiral groove; comprehensive online monitoring of ultrasonic wave, ultrahigh frequency and optical signals of GIS equipment is realized, and the monitoring sensitivity and accuracy are good.

Description

TECHNICAL FIELD

[0001] The utility model belongs to GIS partial discharge detection technical field, concretely relates to a composite sensor for GIS partial discharge detection. BACKGROUND

[0002] Gas Insulated Switchgear (GIS) as the key primary equipment in power system is widely used in various ultra / EHV substation. However, in the GIS equipment manufacturing, transportation, installation and long-term operation process, it can cause congenital partial defects such as bubble, crack, suspended conductive point and burr, and these defects can cause the electric field intensity of some areas of GIS equipment to be too high, when it is higher than the breakdown field strength of insulating medium, partial discharge will occur. Through partial discharge detection, the insulation defects existing in GIS equipment can be found in time, and sudden insulation breakdown accidents of equipment can be avoided. Before or when electrical equipment fails, usually accompanied by the generation of "electric pulse, electromagnetic radiation, ultrasonic wave, light, heat, gas" and other characteristic information, for different information, derived SF6 gas state detection, ultrahigh frequency partial discharge detection, ultrasonic wave partial discharge detection, infrared thermal imaging detection and other kinds of live detection technology to avoid failure, ensure the safe operation of GIS equipment.

[0003] But the existing detection means usually adopts any one of the above detection technologies to detect GIS equipment, and the detection process is easy to be affected by interference signals, resulting in low detection accuracy;If a variety of ways are used to comprehensively detect GIS equipment, different detection equipment needs to be installed respectively, resulting in increased cost;And the existing fluorescent optical fiber sensor generally fixes the fluorescent optical fiber through the way of slotting, chamfering and gluing, the fluorescent optical fiber is exposed to SF6 gas, SF6 gas will produce corrosive decomposition gas under partial discharge, which will cause the glue to fail, erode the optical fiber protective layer and corrode the optical fiber body after a long time, causing the sensor to fail, the service life is short, and it cannot be used as an accessory for online monitoring of GIS equipment for long-term network operation. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a composite sensor for GIS partial discharge detection, at least for solving the problems in the background art.

[0005] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0006] A composite sensor for GIS partial discharge detection, comprising a cover plate, the cover plate is provided with an ultrasonic wave sensing assembly, an ultrahigh frequency sensing assembly and a light sensing assembly;

[0007] The ultrasonic sensing assembly comprises an ultrasonic sensing fiber and two ST fiber joints, the upper end surface of the cover plate is provided with an annular groove, the ultrasonic sensing fiber is fixed in the annular groove in a ring shape, and the two ends of the ultrasonic sensing fiber are connected with the two ST fiber joints respectively, one ST fiber joint is used for injecting an optical signal into the ultrasonic sensing fiber, and the other ST fiber joint is used for transmitting the optical signal of the ultrasonic sensing fiber to the GIS device body outside;

[0008] The UHF sensing assembly comprises a sealing base, a sealing compression ring, a mushroom head probe and an N-type joint arranged on the lower end surface of the cover plate in sequence, the sealing base and the sealing compression ring are provided with coaxial first and second mounting holes, the first and second mounting holes are respectively provided with a spring and a mandrel, the upper end of the spring is connected with the N-type joint, the lower end of the spring is inserted into the upper end of the mandrel, the mushroom head probe comprises a head portion and a connecting portion, the head portion is arranged at the bottom of the sealing compression ring, and the connecting portion is sleeved on the lower end of the mandrel, and the UHF sensing assembly transmits UHF signals to the GIS device body outside through the N-type joint;

[0009] The optical sensing assembly comprises a fluorescent fiber and a fiber penetrator, the lower end surface of the mushroom head probe is provided with a spiral groove, the fluorescent fiber is fixed in the spiral groove in a spiral shape, one end of the fluorescent fiber penetrates the mushroom head probe, the sealing compression ring and the sealing base in sequence and is connected with the fiber penetrator, and the optical sensing assembly transmits optical signals to the GIS device body outside through the fiber penetrator.

[0010] Further, the upper end surface of the cover plate is provided with a wire outlet box, the N-type joint and the fiber penetrator are arranged in the wire outlet box, a support is arranged in the wire outlet box, the two ST fiber joints are fixed on the support, and a sensitizing mandrel is arranged between the ST fiber joints and the end portions of the ultrasonic sensing fiber.

[0011] Further, the N-type joint, the spring, the mandrel and the mushroom head probe are coaxially arranged, the N-type joint comprises a flange fixed on the center of the cover plate, a joint core is arranged in the flange, an insulating ring is sleeved on the upper end of the joint core, a copper column is sleeved on the lower end of the joint core, and the lower end of the copper column is connected with the spring.

[0012] Further, the upper end surface of the sealing compression ring is provided with an annular mounting groove, a fixing ring is arranged in the mounting groove, the mushroom head probe, the sealing compression ring and the fixing ring are connected as a whole through screws.

[0013] Further, the UHF sensing assembly further comprises a compression ring, the compression ring is arranged outside the sealing base and the sealing compression ring, and the compression ring, the sealing base and the sealing compression ring are fixed on the lower end surface of the cover plate through a plurality of screws.

[0014] Further, the lower end surface of the cover plate and the upper end surface of the mandrel are both provided with annular sealing grooves, and sealing rings are arranged in all the sealing grooves.

[0015] Further, the ultrasonic sensing fiber and the fluorescent fiber are both common single-mode fiber or characteristic multi-core fiber which are not sensitive to bending.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] 1, the utility model discloses a set ultrasonic sensing assembly, second sensor assembly and light sensing assembly can be to the ultrasonic signal, ultra high frequency signal and weak light signal that GIS partial discharge generates are monitored synthetically on line, effectively overcome the defect that single mode judges partial discharge signal accuracy is lower, the reliability of GIS partial discharge detection is improved significantly.

[0018] 2, the utility model discloses fluorescent fiber is directly installed in the GIS equipment inside, when GIS equipment produces partial discharge, fluorescent fiber can directly measure the light that partial discharge generates, is not interfered with the rest signal, compared with the measurement mode that the existing sensor indirectly measures partial discharge by measuring ultrasonic wave or ultra high frequency electromagnetic signal, the fluorescent fiber directly exposed in the GIS body inside can effectively improve the sensitivity and accuracy of partial discharge monitoring.

[0019] 3, the utility model discloses ultrasonic sensing assembly, ultra high frequency sensing assembly and light sensing assembly are integrated on the cover plate reasonably, install the cover plate on the reserved hand hole of GIS equipment, can realize the strong coupling of the ultrasonic wave, weak light and ultra high frequency signal that GIS partial discharge generates to GIS partial discharge, has simple structure, compact size, convenient installation, can live operation, the characteristics such as strong anti-electromagnetic interference ability, still have safe and reliable, comprehensive multi-parameter judgment and detection sensitivity and so on advantage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structural schematic diagram of the utility model;

[0021] Figure 2 It is the explosion view of the utility model;

[0022] Figure 3 It is the sectional view of the utility model;

[0023] Figure 4 It is the bottom view of the utility model.

[0024] In the diagram: 1. Cover plate; 11. Ring groove; 12. Outlet box; 13. Bracket; 2. Ultrasonic sensing component; 21. Ultrasonic sensing fiber; 22. ST fiber optic connector; 3. UHF sensing component; 3. Sealing base; 31. Sealing pressure ring; 32. Fixing ring; 33. Mushroom head probe; 34. Spiral groove; 341. Pressure ring; 35. N-type connector; 36. Flange; 361. Connector core; 362. Insulating ring; 363. Copper pillar; 364. Spring; 37. Mandrel; 38. Optical sensing component; 4. Fluorescent fiber; 41. Fiber optic connector; 42. Sealing ring; 5. Screw; 6. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] Example

[0027] like Figures 1-3 As shown, a composite sensor for partial discharge detection in GIS includes a cover plate 1, on which an ultrasonic sensing component 2, an ultra-high frequency sensing component 3, and an optical sensing component 4 are provided; an annular groove 11 and a terminal box 12 are provided on the upper end surface of the cover plate 1, and a bracket 13 is installed inside the terminal box 12; an annular sealing groove is opened on the lower end surface of the cover plate 1, and a sealing ring 5 is installed inside the sealing groove.

[0028] like Figures 1-3 As shown, the ultrasonic sensing component 2 includes an ultrasonic sensing fiber 21 and two ST fiber connectors 22. The ultrasonic sensing fiber 21 is coiled in a ring within the annular groove 11 on the upper surface of the cover plate 1 and fixed by pouring epoxy resin. The two ST fiber connectors 22 are fixed on the bracket 13 and are respectively connected to the two ends of the ultrasonic sensing fiber 21. A sensitivity-enhancing mandrel (not shown in the figure) is provided between the ends of the ST fiber connectors 22 and the ultrasonic sensing fiber 21. One ST fiber connector 22 is used to inject optical signals into the ultrasonic sensing fiber 21, and the other ST fiber connector 22 is used to transmit the optical signals of the ultrasonic sensing fiber 21 to the outside of the GIS equipment body.

[0029] like Figures 2-3As shown, the ultra-high frequency sensing assembly 3 includes a sealing base 31, a sealing compression ring 32, a mushroom head probe 34 and an N-type joint 36 arranged in sequence on the lower end face of the cover plate 1; the sealing base 31 and the sealing compression ring 32 are respectively provided with coaxial first and second mounting holes, the first and second mounting holes are respectively provided with a spring 37 and a mandrel 38, the N-type joint 36 includes a flange 361 fixed on the center of the upper end face of the cover plate 1, the flange 361 is provided with a joint core 362, the upper end of the joint core 362 is sleeved with an insulating ring 363, the lower end of the joint core 362 is sleeved with a copper column 364, the lower end of the copper column 364 is connected with the spring 37, and the lower end of the spring 37 is inserted into the upper end of the mandrel 38; the mushroom head probe 34 includes a head part and a connecting part, the head part is arranged at the bottom of the sealing compression ring 32, and the connecting part is arranged in the second mounting hole and sleeved on the lower end of the mandrel 38; the upper end face of the sealing compression ring 32 is provided with an annular mounting groove, the mounting groove is provided with a fixing ring 33, and the screw 6 penetrates the head part of the mushroom head probe 34, the sealing compression ring 32 and the fixing ring 33 in sequence and fixes the three parts as a whole; the upper end face of the mandrel 38 is provided with an annular sealing groove, and the sealing groove is provided with a sealing ring 5; the N-type joint 36 is located in the outlet box 12, the N-type joint 36, the spring 37, the mandrel 38 and the mushroom head probe 34 are coaxially arranged, and the ultra-high frequency sensing assembly 3 transmits the ultra-high frequency signal to the GIS device body outside through the N-type joint 36.

[0030] As shown in the figure, Figures 2-4 The optical sensing assembly 4 includes a fluorescent optical fiber 41 and an optical fiber through device 42, the lower end face of the mushroom head probe 34 is provided with a spiral groove 341, the fluorescent optical fiber 41 is fixed in the spiral groove 341 by being spirally wound by pouring epoxy resin; the optical fiber through device 42 penetrates and is fixed on the cover plate 1, the optical fiber through device 42 is located in the outlet box 12, one end of the fluorescent optical fiber 41 penetrates the mushroom head probe 34, the sealing compression ring 32 and the sealing base 31 in sequence and is connected with the optical fiber through device 42, and the optical sensing assembly 4 transmits the optical signal to the GIS device body outside through the optical fiber through device 42. The fluorescent optical fiber 41 is wrapped by the epoxy resin, so that the fluorescent optical fiber 41 is isolated from the corrosive gas generated by the partial discharge of the GIS device, the optical fiber body is prevented from being corroded, the optical sensing assembly 4 is prevented from being invalid, the optical sensing assembly 4 has a good service life, and can be used as an accessory of the GIS device for online monitoring and long-time network operation.

[0031] The ultrasonic sensing optical fiber 21 and the fluorescent optical fiber 41 both adopt common single-mode optical fibers or characteristic multi-core optical fibers which are not sensitive to bending.

[0032] The specific implementation is as follows:

[0033] The composite sensor is installed in the reserved hand hole of the GIS equipment, the cover plate 1 is fixed on the shell of the GIS equipment through screws, the ultrasonic sensing assembly 2 is located outside the shell of the GIS equipment, the UHF sensing assembly 3 and the light sensing assembly 4 are located inside the shell of the GIS equipment, and the ST optical fiber joint 22, the N-shaped joint 36 and the optical fiber through device 42 are communicated with the external detection equipment, so that the detection of ultrasonic waves, UHF and light signals can be carried out.

[0034] The composite sensor has the ability of simultaneously detecting ultrasonic signals, UHF signals and light signals, can be installed on the GIS equipment to realize real-time online monitoring of the GIS equipment, has high detection sensitivity, can comprehensively judge multiple parameters during detection, and has reliable detection results and high accuracy; in addition, the composite sensor has the advantages of simple structure and compact size, is convenient to install on the GIS equipment, can be operated under electricity, and has strong anti-electromagnetic interference capability.

[0035] The above is only an embodiment of the utility model, and the known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be noted that, for those skilled in the art, without departing from the technical solutions of the utility model, a plurality of deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect and practicality of the utility model. The protection scope of the present application should be subject to the content of the claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A composite sensor for GIS partial discharge detection, characterized by: The utility model relates to a cover plate (1) is provided with ultrasonic wave sensor assembly (2), VHF sensor assembly (3) and light sensor assembly (4) on the cover plate (1), and the cover plate (1) is provided with the ultrasonic wave sensor assembly (2), VHF sensor assembly (3) and light sensor assembly (4) on the cover plate (1). The ultrasonic wave sensor assembly (2) includes ultrasonic sensing fiber (21) and two ST fiber joints (22), the upper end surface of the cover plate (1) is provided with a ring groove (11), the ultrasonic sensing fiber (21) is fixed in the ring groove (11) in a ring shape, the two ends of the ultrasonic sensing fiber (21) are connected with the two ST fiber joints (22) respectively, one ST fiber joint (22) is used for injecting light signal to the ultrasonic sensing fiber (21), and the other ST fiber joint (22) is used for transmitting the light signal of the ultrasonic sensing fiber (21) to the GIS device body outside. The VHF sensor assembly (3) includes a sealing base (31), a sealing compression ring (32), a mushroom head probe (34) and an N type joint (36) arranged on the lower end surface of the cover plate (1) in sequence, the sealing base (31) and the sealing compression ring (32) are provided with coaxial first mounting holes and second mounting holes, the first mounting holes and the second mounting holes are respectively provided with a spring (37) and a mandrel (38), the upper end of the spring (37) is connected with the N type joint (36), the lower end of the spring (37) is inserted into the upper end of the mandrel (38), the mushroom head probe (34) includes a head part and a connecting part, the head part is arranged at the bottom of the sealing compression ring (32), and the connecting part is sleeved on the lower end of the mandrel (38), the VHF sensor assembly (3) transmits VHF signals to the GIS device body outside through the N type joint (36). The light sensor assembly (4) includes a fluorescent fiber (41) and a fiber through device (42), the lower end surface of the mushroom head probe (34) is provided with a spiral groove (341), the fluorescent fiber (41) is fixed in the spiral groove (341) in a spiral shape, one end of the fluorescent fiber (41) penetrates the mushroom head probe (34), the sealing compression ring (32) and the sealing base (31) in sequence and is connected with the fiber through device (42), and the light sensor assembly (4) transmits light signals to the GIS device body outside through the fiber through device (42).

2. The composite sensor for partial discharge detection of GIS according to claim 1, characterized in that: The upper end surface of the cover plate (1) is provided with a wire outlet box (12), the N type joint (36) and the fiber through device (42) are arranged in the wire outlet box (12), the wire outlet box (12) is provided with a support (13), the two ST fiber joints (22) are fixed on the support (13), and a sensitizing mandrel is arranged between the ST fiber joint (22) and the end of the ultrasonic sensing fiber (21).

3. The composite sensor for partial discharge detection of GIS according to claim 2, characterized in that: The N type joint (36), the spring (37), the mandrel (38) and the mushroom head probe (34) are coaxially arranged, the N type joint (36) includes a flange (361) fixed in the center of the cover plate (1), the flange (361) is provided with a joint core (362), the upper end of the joint core (362) is sleeved with an insulating ring (363), the lower end of the joint core (362) is sleeved with a copper column (364), and the lower end of the copper column (364) is connected with the spring (37).

4. The composite sensor for partial discharge detection of GIS according to claim 1, characterized in that: The upper end surface of the sealing ring (32) is provided with an annular mounting groove, and a fixing ring (33) is arranged in the mounting groove.

5. The composite sensor for partial discharge detection of GIS according to claim 4, characterized in that: The ultrahigh frequency sensing assembly (3) further comprises a pressing ring (35), which is arranged outside the sealing base (31) and the sealing ring (32), and the pressing ring (35), the sealing base (31) and the sealing ring (32) are fixed on the lower end surface of the cover plate (1) by a plurality of screws (6).

6. The composite sensor for partial discharge detection of GIS according to claim 1, characterized in that: The lower end surface of the cover plate (1) and the upper end surface of the mandrel (38) are both provided with annular sealing grooves, and sealing rings (5) are arranged in all the sealing grooves.

7. The composite sensor for partial discharge detection of GIS according to claim 1, characterized in that: The ultrasonic sensing optical fiber (21) and the fluorescent optical fiber (41) both adopt common single-mode optical fibers or characteristic multi-core optical fibers which are insensitive to bending.

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