CN216816737U

CN216816737U - Ultrahigh frequency partial discharge sensor performance test fixture and device

Info

Publication number: CN216816737U
Application number: CN202122781160.2U
Authority: CN
Inventors: 任茂鑫; 王劭菁; 舒博; 徐鹏; 周海洋; 钱勇
Original assignee: Shanghai Jiaotong University; State Grid Shanghai Electric Power Co Ltd; East China Power Test and Research Institute Co Ltd
Current assignee: Shanghai Jiaotong University; State Grid Shanghai Electric Power Co Ltd; East China Power Test and Research Institute Co Ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-06-24
Anticipated expiration: 2031-11-15

Abstract

The utility model relates to a performance test fixture and a device for an ultrahigh frequency partial discharge sensor, wherein the fixture comprises a fixing ring, a flange plate, a clamping component and an angle adjusting component, the flange plate comprises a flange plate surface and a mounting ring, the mounting ring and the flange plate surface are coaxially mounted, a convex flange is arranged on the periphery of the flange plate surface, the bottom of the inner ring of the corresponding fixed ring is provided with a groove matched with the flange, the flange is clamped into the groove and rotationally arranged, the clamping components are arranged in four groups and are uniformly distributed along the annular surface of the mounting ring to clamp and fix the sensor at the central position of the flange surface, the angle adjusting component is arranged on the flange plate and the fixing ring and used for adjusting the rotation angle of the flange plate relative to the fixing ring and fixing the position of the flange plate. Compared with the prior art, the utility model can accurately adjust the position and the angle of the sensor and ensure the consistency of the measurement result.

Description

Ultrahigh frequency partial discharge sensor performance test fixture and device

Technical Field

The utility model relates to the technical field of ultrahigh frequency partial discharge testing, in particular to a clamp and a device for testing performance of an ultrahigh frequency partial discharge sensor.

Background

The ultrahigh frequency partial discharge detection technology is an important method for early fault discovery, fault diagnosis and positioning of power equipment, and the ultrahigh frequency partial discharge sensor is a broadband antenna working at 300 MHz-3000 MHz. The related standards specify technical specifications and test methods of the ultrahigh frequency partial discharge live detection instrument, including effective height performance indexes of the ultrahigh frequency partial discharge sensor and performance indexes of the detection instrument. In the performance test, the average effective height of the sensor between 300MHz and 1500MHz should be not less than 8mm, and the minimum effective height should be not less than 3 mm.

The measurement calibration system based on the GTEM cell adopted at present consists of a calibration pulse signal source, the GTEM cell, a single-stage standard probe, a high-speed digital oscilloscope, a measurement and control computer, analysis software and various cable accessories. The structure of the measurement calibration system is schematically shown in FIG. 1, and a mounting hole for mounting a sensor is formed in the GTEM chamber. The principle of the effective height test of the sensor using the GTEM cell based measurement calibration system is shown in figure 2. Under the current measurement method, the sensor passes through a mounting panel direct mount in the mounting hole department of GTEM cell, and the position that different testers installed the sensor is unset, and this kind of test mode exists that the test result accuracy is lower, and the test result uniformity is relatively poor, and the test result receives external influence factor great, is unfavorable for developing sensor performance check, aassessment and comparative analysis.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a clamp and a device for testing the performance of an ultrahigh frequency partial discharge sensor.

The purpose of the utility model can be realized by the following technical scheme:

the utility model provides a superfrequency partial discharge sensor capability test anchor clamps, includes solid fixed ring, ring flange, centre gripping subassembly and angle adjustment subassembly, the ring flange include flange quotation and collar, collar and flange quotation coaxial installation, flange quotation week side be equipped with the flange of evagination, correspond gu fixed ring inner circle bottom be equipped with the recess of flange adaptation, the flange card go into the recess in rotatory setting, the centre gripping subassembly set up four groups and follow collar evenly distributed will the sensor centre gripping fix flange quotation central point put, angle adjustment subassembly set up on ring flange and solid fixed ring, angle adjustment subassembly be used for adjusting the relative solid fixed ring's of ring flange rotation angle and fix the position of ring flange.

Preferably, the centre gripping subassembly include slider, spacing fixed block and locking piece, spacing fixed block install the collar on, spacing fixed block on be equipped with and be used for restricting the slider along the radial gliding sliding opening of flange quotation, the slider install the sliding opening in, after the slider slided to target in place, the slider pass through the locking piece with spacing fixed block locking.

Preferably, the slider include draw runner and baffle, the baffle fix in draw runner one end, the draw runner slidable mounting in the sliding opening of spacing fixed block, the baffle be used for with the sensor side conflict compress tightly the sensor.

Preferably, the slide bar is provided with scale marks for marking the sliding distance of the slide bar.

Preferably, the locking piece comprises a locking hole formed in the limiting fixing block, a locking screw is arranged in the locking hole, and when the sliding block slides in place, the locking screw penetrates through the locking hole to be locked with the sliding block.

Preferably, the angle adjusting assembly including install the movable fixed pin on solid fixed ring and set up the locking hole of installing ring week side on the ring flange, the locking hole along installing ring circumference evenly distributed a plurality of, work as the ring flange rotate the back of targetting in place, movable fixed pin insert correspond the locking hole of position department in will ring flange and solid fixed ring locking fixed.

Preferably, movable fixed pin include sleeve, thimble and baffle, the sleeve fix solid fixed ring on, the sleeve be equipped with the cavity sliding tray, the baffle setting be in sleeve one end tip, the head of thimble pass the baffle install telescopic cavity sliding tray in, the head of thimble be with the locking end of locking hole adaptation, the afterbody of thimble be equipped with the pulling the thimble at the gliding handle in the sleeve, the sleeve side correspond be equipped with be used for with the breach that the handle was drawn.

Preferably, the movable fixing pin further comprises an elastic member, the elastic member is arranged in the hollow sliding groove, one end of the elastic member is connected with the tail part of the thimble, the other end of the elastic member is connected with the sleeve, and when the elastic member is not influenced by external force, the head part of the thimble is ejected out and inserted into the locking hole at the corresponding position on the mounting ring.

Preferably, the elastic member comprises a spring.

The device also comprises a clamp, wherein a fixing ring is fixed at the position of the mounting hole on the GTEM cell, and the sensor is arranged on a flange plate on the clamp.

Compared with the prior art, the utility model has the following advantages:

(1) according to the clamp, the sensor is arranged on the flange plate through the clamping assembly with the adjustable radial distance, so that the position of the sensor can be accurately fixed, meanwhile, the angle adjusting assembly is arranged to adjust the rotating angle of the flange plate relative to the fixing ring so as to realize accurate adjustment of the mounting angle of the sensor, the detection flow of the sensor is standardized, uncertain factors in the performance verification process of the sensor are eliminated, and the problem of poor result consistency of the existing testing method is solved;

(2) the device can compare the performances of different types of sensing devices and analyze historical data, accurately master the performances of the sensing devices, guide ultrahigh frequency partial discharge detection and contribute to improving the detection level and reliability.

Drawings

FIG. 1 is a schematic diagram of a GTEM cell-based metrology calibration system;

FIG. 2 is a schematic diagram of the principle of effective height measurement of a sensor using a GTEM cell based measurement calibration system;

FIG. 3 is a schematic structural diagram of a performance test fixture for an ultrahigh frequency partial discharge sensor according to the present invention;

FIG. 4 is a schematic view of a retaining ring according to the present invention;

FIG. 5 is a first schematic structural view of the flange of the present invention;

FIG. 6 is a second schematic structural view of the flange of the present invention;

FIG. 7 is a schematic view of a clamping assembly according to the present invention;

FIG. 8 is a schematic view of the structure of the slider in the clamping assembly of the present invention;

FIG. 9 is a schematic structural view of a position-limiting fixing block of the clamping assembly of the present invention;

FIG. 10 is a schematic view of the movable fixing pin according to the present invention;

FIG. 11 is a schematic view of the sleeve of the present invention;

FIG. 12 is a schematic structural view of the thimble according to the present invention;

fig. 13 is a schematic structural view of a baffle plate in the present invention.

In the figure, 1 is a fixing ring, 2 is a flange, 3 is a clamping component, 4 is an angle adjusting component, 11 is a fixing hole, 12 is a threaded hole, 13 is a groove, 21 is a flange surface, 22 is a mounting ring, 23 is a flange, 24 is a locking hole, 31 is a sliding block, 32 is a limiting fixing block, 41 is a sleeve, 42 is an ejector pin, and 43 is a baffle.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.

Examples

As shown in fig. 3, the embodiment provides a performance testing fixture for an ultrahigh frequency partial discharge sensor, which includes a fixing ring 1, a flange 2, a clamping assembly 3 and an angle adjusting assembly 4, where the flange 2 includes a flange plate 21 and a mounting ring 22, the mounting ring 22 and the flange plate 21 are coaxially mounted, a convex flange 23 is disposed on the periphery of the flange plate 21, a groove 13 adapted to the flange 23 is disposed at the bottom of the inner ring of the corresponding fixing ring 1, the flange 23 is clamped into the groove 13 and rotatably disposed, the clamping assembly 3 is provided with multiple groups and uniformly distributed along the ring surface of the mounting ring 22 to clamp and fix the sensor on the flange plate 21, the angle adjusting assembly 4 is disposed on the flange 2 and the fixing ring 1, and the angle adjusting assembly 4 is used for adjusting the rotation angle of the flange 2 relative to the fixing ring 1 and fixing the position of the flange 2, four sets of clamping assemblies 3 are provided in this embodiment for mounting the sensor in the central position of the flange 2.

Referring to fig. 4, the fixing ring 1 is an integral structure, the fixing ring 1 is a circular ring structure, the fixing ring 1 is provided with a circle of 8 fixing holes 11, the fixing ring is matched with mounting holes on a GTEM small chamber to fix the fixing ring 1 on the GTEM small chamber, two threaded holes 12 are formed between the two fixing holes 11 and used for mounting the angle adjusting assembly 4, and the bottom of the fixing ring 1 is provided with a recessed groove 13 used for clamping a flange 2 for placing a sensor.

The flange plate 2 comprises a flange plate surface 21 and a mounting ring 22, the mounting ring 22 and the flange plate surface 21 are coaxially mounted, a convex flange 23 is arranged on the peripheral side of the flange plate surface 21, a groove 13 matched with the flange 23 is formed in the bottom of the inner ring of the corresponding fixing ring 1, the flange 23 is clamped in the groove 13 and rotationally arranged, and the clamping assembly 3 is mounted on the mounting ring 22 to clamp and fix the sensor on the flange plate surface 21.

Specifically, referring to fig. 5 and 6, the flange 2 is a disc structure, the sensing device to be detected is placed on the surface of the flange 2, and considering that the sensing device is close to the inner cavity of the GTEM cell as much as possible, a circular hole with the largest diameter as possible is made in the center of the flange, but the circular hole cannot be punched through, so that the downward detection depth of the sensing device is ensured to be consistent with the current detection depth when the device is used for detection. The bottom of the cylindrical surface of the flange plate 2 is provided with a circle of protruding flanges 23, the structure is matched with the grooves 13 in the fixing ring 1, the fixing ring 1 can enable the flange plate 2 to rotate around the center of the fixing ring 1 without moving towards other directions after being pressed tightly, the angle of a sensor to be measured is adjusted, the cylindrical surface of the flange plate 2 (namely the mounting ring 22) is provided with a circle of locking holes 24 which are matched with the angle adjusting component 4 for use, the sensor to be measured can rotate an angle every time one hole is rotated, then the angle adjusting component 4 can fix the flange plate 2 without rotating, so that the number of the locking holes 24 is as large as possible, enough angles are adjusted as possible, the number of the locking holes 24 is 24 in the embodiment, namely, the angle adjusted by one rotation is 15 degrees. Four sets (8 in total for each set of 2) of threaded holes are also formed in the upper surface of the flange 2 and are used for mounting 4 clamping assemblies 3.

The clamping assembly 3 comprises a sliding block 31, a limiting fixing block 32 and a locking piece, the limiting fixing block 32 is installed on the installation ring 22, a sliding opening used for limiting the sliding block 31 to slide along the radial direction of the flange surface 21 is formed in the limiting fixing block 32, the sliding block 31 is installed in the sliding opening, and after the sliding block 31 slides in place, the sliding block 31 is locked with the limiting fixing block 32 through the locking piece. The sliding block 31 comprises a sliding strip and a baffle 43, the baffle 43 is fixed at one end of the sliding strip, the sliding strip is slidably mounted in a sliding opening of the limiting fixing block 32, and the baffle 43 is used for abutting against the side face of the sensor to press the sensor. The slide bar is provided with scale marks for marking the sliding distance of the slide bar.

Specifically, referring to fig. 7 to 9, in the present embodiment, the whole fixture device includes 4 clamping assemblies 3, which are used to adjust the position of the sensor to be measured, so that the sensor is located at the center of the fixture and the sensor is fixed so as not to move, the shape of the limit fixing block 32 is similar to a "u" shape, the protruding portions on the left and right sides respectively have a fixing hole, which is used in cooperation with the threaded hole on the flange 2 for mounting the sensor, the fixing block of the slider 31 can be mounted on the upper surface of the flange 2, the bottom of the middle protruding portion of the limit fixing block 32 is a square sliding opening for clamping the slider 31, the slider 31 is in an "L" shape, the vertical side is a baffle 43, which directly contacts with the sensor to be measured, and supports the sensor so as not to slide, the horizontal side is a square sliding strip, and the cross section is the same as the sliding opening, the sliding blocks 31 can only slide back and forth in the sliding openings and can not move in other directions, four sliding blocks 31 are oppositely crossed in pairs to form a cross, therefore, a square space is formed in the central part of the flange plate 2 for placing the sensor to be tested, the sensor can be fixed at a required position when the four sliding blocks 31 are contacted with the sensor, the sensor is required to be fixed at the central part of the flange plate 2 during testing, it is necessary to print graduation marks on the transverse long-strip portions of the sliders 31, the opposite sliders 31 are required to slide to the same graduation marks, the measured sensor can be ensured to be arranged at the central part of the flange plate 2, the top of the middle convex part of the limit fixing block 32 is provided with a threaded hole leading to the sliding hole, a fastening screw is arranged, when the sliding block 31 slides to a required position, the sliding block 31 can be fixed by screwing the fastening screw.

The angle adjusting assembly 4 comprises a movable fixing pin arranged on the fixing ring 1 and a locking hole 24 arranged on the flange plate 2 on the periphery of the mounting ring 22, the locking hole 24 is uniformly distributed along the circumferential direction of the mounting ring 22, and after the flange plate 2 rotates in place, the movable fixing pin is inserted into the locking hole 24 of the corresponding position to lock and fix the flange plate 2 and the fixing ring 1. The movable fixing pin comprises a sleeve 41, a thimble 42 and a baffle 43, the sleeve 41 is fixed on the fixing ring 1, the sleeve 41 is provided with a hollow sliding groove, the baffle 43 is arranged at one end of the sleeve 41, the head of the thimble 42 passes through the baffle 43 to be installed in the hollow sliding groove of the sleeve 41, the head of the thimble 42 is a locking end matched with the locking hole 24, the tail of the thimble 42 is provided with a handle for pulling the thimble 42 to slide in the sleeve 41, and the side surface of the sleeve 41 is correspondingly provided with a notch for leading out the handle. The movable fixing pin further comprises an elastic member, the elastic member is disposed in the hollow sliding groove, one end of the elastic member is connected to the tail portion of the thimble 42, the other end of the elastic member is connected to the sleeve 41, and when the movable fixing pin is not influenced by an external force, the head portion of the thimble 42 is ejected out and inserted into the locking hole 24 at a corresponding position on the mounting ring 22. In this embodiment, the elastic member is a spring.

Specifically, referring to fig. 10 to 13, in this embodiment, two sides of the sleeve 41 respectively extend out of a structure similar to ears, and each of the two sides of the sleeve 41 is provided with a fixing hole, and the sleeve 41 can be mounted on the upper surface of the fixing ring 1 by matching with a threaded hole on the fixing ring 1, the sleeve 41 is hollow, two notches are respectively formed on the left side and the right side of the hollow portion, two threaded holes are formed on the front end surface for mounting the baffle 43, the thimble 42 is shaped as a cylinder, the diameter of the thimble 42 is close to that of a mounting hole on the cylindrical surface of the flange 2 for mounting the sensor, in the practical application process, the thimble 42 is pushed into the mounting hole to stop the rotation of the flange 2, the top end of the thimble 42 is tapered for convenient insertion, the tail end is connected with a cylinder with a larger diameter, the diameter of the cylinder is close to the center of the sleeve 41, two sides respectively extend out of a slender ear-shaped structure (i.e. a handle), during mounting, the tail end of the thimble 42 is inserted into the center of the sleeve 41, the handle passes through the gap, a round hole is arranged in the middle of the baffle 43, the diameter of the round hole is slightly larger than that of the thimble 42, but is smaller than that of the cylinder at the tail part of the thimble 42, two fixing holes are arranged below the round hole and are matched with the threaded holes in the sleeve 41, the baffle 43 can be arranged at the front end of the sleeve 41, the thimble 42 can move along the central line in the sleeve 41, the top of the thimble 42 can be ensured to pass through the round hole in the baffle 43 and can not fall out of the sleeve 41, when in installation, a proper spring is arranged between the tail part of the thimble 42 and the bottom of the sleeve 41, thereby ensuring that the thimble 42 always keeps the extending state under the action of no external force, in practical application, the thimble 42 is jacked into the locking hole 24 on the cylinder surface of the flange 2 to fix the rotation of the flange 2, when the flange 2 needs to rotate for a certain angle, the thimble 42 is pulled towards the bottom of the sleeve 41 by pulling the handle at the tail part of the thimble 42 by hand, the thimble 42 is pulled out to rotate the flange 2, when the flange is rotated to a required angle, the thimble 42 is loosened, and under the action of the spring, the thimble 42 automatically jacks the locking hole 24 on the cylindrical surface of the flange 2, so that the fixation of the flange 2 can be stopped.

Based on the above-mentioned anchor clamps, this embodiment still provides a superfrequency partial discharge sensor capability test device, including the GTEM cell, be equipped with the mounting hole that is used for installing the sensor on the GTEM cell, the device still includes above-mentioned anchor clamps, and solid fixed ring 1 fixes mounting hole position department on the GTEM cell, and the sensor is installed on the ring flange 2 on the anchor clamps.

When the test device is used for testing the performance of the ultrahigh frequency sensor, the sensor can be accurately fixed at the central position of the mounting hole at the upper part of the GTEM cell, and the placing angle of the sensor can be accurately adjusted, so that the detection flow of the sensor is standardized, uncertain factors in the performance verification process of the sensor are eliminated, and the problem of poor result consistency of the conventional test method is solved. The testing method and the testing device can be used for performing performance comparison and historical data analysis on different types of sensing devices, accurately mastering the performance of the sensing devices, guiding ultrahigh frequency partial discharge detection and contributing to improving the detection level and reliability.

The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.

Claims

1. The utility model provides a superfrequency partial discharge sensor capability test anchor clamps, its characterized in that, including solid fixed ring (1), ring flange (2), centre gripping subassembly (3) and angle adjustment subassembly (4), ring flange (2) including flange quotation (21) and collar (22), collar (22) and flange quotation (21) coaxial arrangement, flange quotation (21) week side be equipped with evagination flange (23), corresponding gu fixed ring (1) inner circle bottom be equipped with recess (13) of flange (23) adaptation, flange (23) card go into recess (13) in the rotatory setting, centre gripping subassembly (3) set up four groups and follow collar (22) anchor ring evenly distributed will the sensor centre gripping fix flange quotation (21) central point put, angle adjustment subassembly (4) set up on ring flange (2) and solid fixed ring (1), the angle adjusting component (4) is used for adjusting the rotation angle of the flange plate (2) relative to the fixing ring (1) and fixing the position of the flange plate (2).

2. The clamp for testing the performance of the ultrahigh frequency partial discharge sensor according to claim 1, wherein the clamping assembly (3) comprises a sliding block (31), a limiting fixed block (32) and a locking piece, the limiting fixed block (32) is mounted on the mounting ring (22), a sliding opening for limiting the sliding block (31) to slide along the radial direction of the flange disk surface (21) is formed in the limiting fixed block (32), the sliding block (31) is mounted in the sliding opening, and after the sliding block (31) slides in place, the sliding block (31) is locked with the limiting fixed block (32) through the locking piece.

3. The clamp for testing the performance of the ultrahigh frequency partial discharge sensor according to claim 2, wherein the sliding block (31) comprises a sliding strip and a baffle (43), the baffle (43) is fixed at one end of the sliding strip, the sliding strip is slidably mounted in a sliding port of the limiting fixed block (32), and the baffle (43) is used for abutting against the side surface of the sensor to press the sensor.

4. The fixture for testing the performance of the UHF partial discharge sensor as claimed in claim 3, wherein the slide bar is provided with scale marks for marking the sliding distance of the slide bar.

5. The clamp for testing the performance of the UHF partial discharge sensor as claimed in claim 2, wherein the locking member comprises a locking hole opened on a limit fixing block (32), a locking screw is arranged in the locking hole, and when the sliding block (31) slides to a proper position, the locking screw passes through the locking hole to be locked with the sliding block (31).

6. The clamp for testing the performance of the ultrahigh frequency partial discharge sensor according to claim 1, wherein the angle adjusting assembly (4) comprises a movable fixing pin installed on the fixing ring (1) and locking holes (24) arranged on the periphery of the mounting ring (22) on the flange plate (2), the locking holes (24) are uniformly distributed along the circumferential direction of the mounting ring (22), and when the flange plate (2) is rotated in place, the movable fixing pin is inserted into the locking holes (24) at the corresponding positions to lock and fix the flange plate (2) and the fixing ring (1).

7. The performance test fixture for UHF partial discharge sensors as claimed in claim 6, it is characterized in that the movable fixing pin comprises a sleeve (41), a thimble (42) and a baffle (43), the sleeve (41) is fixed on the fixing ring (1), the sleeve (41) is provided with a hollow sliding groove, the baffle plate (43) is arranged at one end part of the sleeve (41), the head part of the thimble (42) passes through the baffle plate (43) and is arranged in the hollow sliding groove of the sleeve (41), the head of the thimble (42) is a locking end matched with the locking hole (24), the tail part of the thimble (42) is provided with a handle for pulling the thimble (42) to slide in the sleeve (41), the side surface of the sleeve (41) is correspondingly provided with a notch for leading out the handle.

8. The clamp for testing performance of UHF partial discharge sensor as claimed in claim 7, wherein said movable fixing pin further comprises an elastic member, said elastic member is disposed in said hollow sliding groove, one end of said elastic member is connected to the tail of said thimble (42), the other end is connected to said sleeve (41), and when the external force is not applied, the head of said thimble (42) is ejected out and inserted into the locking hole (24) at the corresponding position on the mounting ring (22).

9. The fixture for testing performance of UHF partial discharge sensors as claimed in claim 8, wherein said elastic member comprises a spring.

10. An ultrahigh frequency partial discharge sensor performance testing device, which comprises a GTEM cell, wherein a mounting hole for mounting a sensor is formed in the GTEM cell, the device is characterized by further comprising a clamp according to any one of claims 1 to 9, a fixing ring (1) is fixed at the position of the mounting hole in the GTEM cell, and the sensor is mounted on a flange plate (2) on the clamp.