A transformer partial discharge monitoring device

Abstract

The present invention relates to the technical field of transformer discharge monitoring, specifically a transformer partial discharge monitoring device, including a test assembly and a voltage transfer mechanism and three groups of lines to be tested, and a cable distance adjustment mechanism arranged between the test assembly and the voltage transfer mechanism. By providing an independent monitoring cavity for insulating materials at the location of the transformer and cable joint, and inputting different media that affect the insulating materials into the independent monitoring cavity, as the transformer and the cable continue to transfer current, the corrosion of the cable insulating materials by different media in multiple independent monitoring cavities within a specified time period will directly affect the insulation and sealing of the joint. By comparing the samples extracted from the multi-factor cavity under the gas chromatography detection data, it is possible to simulate the current breakdown resistance of the cable insulating materials and the transformer under the influence of different media outdoors, and thus more effectively monitor the impact of the cable on the transformer discharge problem.

Description

Technical Field

[0001] The invention relates to the technical field of transformer discharge monitoring, in particular to a transformer partial discharge monitoring device. Background Art

[0002] Power transformers are important equipment in power systems. Partial discharge may occur during operation, which will not only affect the normal operation of the transformer, but may also cause major accidents. Therefore, understanding the causes of partial discharge in transformers and adopting correct and appropriate monitoring methods are of great significance to ensure the safety and stability of the power system.

[0003] The partial discharge power monitoring of power transformers mainly includes internal charge distribution monitoring, electrical signal tracking monitoring, insulation material insulation performance monitoring, etc. Among them, the commonly used monitoring methods are high-frequency instrument monitoring method, AC voltage conversion method, ultra-wideband measurement method, frequency method, etc. However, the commonly used monitoring methods are mainly carried out in specific laboratories. Since the power transformer is set outdoors, when the external climate, weather and environmental factors change, the above methods cannot simulate the insulation performance of the insulation material under different factors. Monitoring, therefore, the cable that cannot obtain simulated anti-current breakdown monitoring will directly affect the problem of discharge around the power transformer.

[0004] In view of this, the present invention designs a transformer partial discharge monitoring device to solve the above-mentioned problem by simulating comparative monitoring of multi-factor discharge breakdown for the transformer and cable connection parts in a specific laboratory. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted in the present invention is:

[0007] A transformer partial discharge monitoring device comprises a test assembly, a voltage transfer mechanism and three groups of lines to be tested, a cable distance adjustment mechanism arranged between the test assembly and the voltage transfer mechanism and multiple groups of line head simulation monitoring mechanisms arranged on the cable distance adjustment mechanism; the test assembly comprises an output connector to be tested; the voltage transfer mechanism comprises an input connector to be tested; the line to be tested comprises an upper terminal connected to the output connector, a lower terminal connected to the input connector and a cable installed between the upper terminal and the lower terminal; the cable distance adjustment mechanism is used to adjust the spacing between the multiple groups of line head simulation monitoring mechanisms and the corresponding symmetrically distributed output connectors and input connectors, and reduce the generation of electric arcs; the line head simulation monitoring mechanism comprises a sampling assembly arranged at the bottom of the cable end, a monitoring assembly arranged at the top of the cable end, a temperature monitoring head arranged in the sampling assembly and an external pipe arranged on the sampling assembly; after being overlapped, the sampling assembly and the monitoring assembly are built with an independent monitoring cavity, the temperature monitoring head is used to detect the temperature in the independent monitoring cavity, and the external pipe is connected to the monitoring cavity to provide multiple media to be tested to the independent monitoring cavity.

[0008] In a preferred example, the present invention can be further configured as follows: the test assembly further includes a grounded base and a transformer mounted on the base;

[0009] The number of the output connectors is three, and the three output connectors are arranged on the output line interface on the top of the transformer.

[0010] In a preferred example, the present invention can be further configured as follows: the voltage transfer mechanism further includes a grounded base and three transfer terminals installed in the base;

[0011] The number of the input connectors is three, and the three input connectors are respectively installed on the input line interfaces at the top of the three transfer terminals;

[0012] A current measuring wire is connected to the terminal post at the bottom end of the transfer terminal.

[0013] In a preferred example, the present invention can be further configured as follows: the cable distance adjustment mechanism includes a ground rail arranged on the laboratory floor;

[0014] The ground rail is composed of three rails and end plates connected to the three rails, and two sets of clamps are installed on one of the rails, and hydraulic parts are installed in the two sets of clamps. The hydraulic parts are composed of a hydraulic sub-rod and a hydraulic mother rod, and a clamp seat is installed on the top of the hydraulic sub-rod;

[0015] Two traction plates are movably connected to the clamp seat, and two traction plates are connected to two beam plates, one of which has three first support rods installed in it, and the other has three second support rods installed in it;

[0016] The three first support rods and the three second support rods are movably installed in the three tracks.

[0017] In a preferred example, the present invention may be further configured as follows: a first bracket is fixedly mounted on the top end of the first support rod;

[0018] A second bracket is fixedly mounted on the top end of the second support rod;

[0019] The first bracket and the second bracket are both composed of two Z-shaped ceramic brackets and a T-shaped insulating pad, and screw holes are provided at the top ends of the Z-shaped ceramic brackets.

[0020] In a preferred example, the present invention can be further configured as follows: the thread head simulation monitoring mechanism also includes two lengthened bolts, two sealing gaskets arranged outside the lengthened bolts, a sealing sleeve for supporting the upper end, and a drawer for extracting new products.

[0021] In a preferred example, the present invention can be further configured as follows: the sampling assembly includes a bottom sealing cover located at the bottom of the upper end line end, a No. 2 sealing gasket installed in the internal groove of the bottom sealing cover, a bottom anti-seepage pad arranged inside the bottom sealing cover, a pressure-bearing rod installed between the bottom sealing cover and the bottom anti-seepage pad, a second slide seat movably installed on the pressure-bearing rod, and a second scraper arranged on the second slide seat.

[0022] In a preferred example, the present invention can be further configured as follows: a rectangular storage bin is installed at the bottom of the bottom sealing cover, and a notch is opened at the top of the rectangular storage bin, and the notch is connected to the cavity of the bottom sealing cover;

[0023] Two symmetrically distributed rectangular columns are fixedly mounted on the top of the second slide.

[0024] In a preferred example, the present invention can be further configured as follows: the monitoring assembly includes a top sealing cover located at the top of the upper end line end, a No. 1 sealing pad installed in the inner groove of the top sealing cover, a top anti-seepage pad arranged inside the top sealing cover, and a driving assembly installed on the top sealing cover;

[0025] A transverse hole is provided inside the top anti-seepage pad, and a first bearing is installed in the transverse hole; a slot hole is provided on the inner wall of the top sealing cover, and a second bearing is installed in the slot hole; screw rods are installed in the first bearing and the second bearing, a first slide seat is provided on the screw rod, and a first scraper is installed on the first slide seat;

[0026] The driving assembly is composed of a chassis and a motor, and a chain is connected to the gear on the motor transmission shaft and the gear on the outer end of the lead screw.

[0027] In a preferred example, the present invention can be further configured as follows: the monitoring assembly further includes two fastening clamps installed in the top vertical pipe of the top sealing cover;

[0028] An L-shaped end pipe is installed at one end of the top sealing cover close to the vertical pipe, and the external pipeline is connected to the threaded end of the L-shaped end pipe.

[0029] By adopting the above technical solution, the beneficial effects achieved by the present invention are:

[0030] 1. The present invention provides independent monitoring cavities for insulating materials at the locations of transformer and cable joints, and inputs different media that affect the insulating materials into the independent monitoring cavities. As the transformer and the cable continue to transfer current, the corrosion of the cable insulating materials by different media in multiple independent monitoring cavities within a specified time period will directly affect the insulation and sealing of the joints. By comparing the samples extracted from the multi-factor cavities under the gas chromatography test data, the current breakdown resistance of the cable insulating materials and the transformer under the influence of different media outdoors can be simulated, thereby more effectively monitoring the impact of the cable on the transformer discharge problem.

[0031] 2. The present invention observes the data transmitted by the temperature monitoring head in the independent monitoring cavity, starts the motor in a specific time period, and then the new products on the cable in the independent monitoring cavity can be extracted without interference, and the influence of multiple factors on the cable is simulated under constant voltage and current, which can improve the reliability of the comparison data. At the same time, the sealing status monitoring experiment of the joint part can be carried out, which can avoid the occurrence of dangerous accidents caused by sudden discharge of the transformer joint during the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the present invention when used;

[0033] Figure 2 It is a schematic diagram of a three-dimensional test of the present invention;

[0034] Figure 3 is a schematic diagram of the test assembly and voltage transfer mechanism of the present invention;

[0035] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the connection of the middle and upper ends;

[0036] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the connection of the middle and lower ends;

[0037] Figure 6 is a schematic diagram of the cable distance adjustment mechanism of the present invention;

[0038] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of point A in the middle;

[0039] Figure 8 It is a schematic diagram of the thread end simulation monitoring mechanism of the present invention;

[0040] Fig. 9 It is a schematic diagram of the explosion of the thread end simulation monitoring mechanism of the present invention;

[0041] Fig.10 It is a cross-sectional schematic diagram of a bottom sealing cover and a top sealing cover of the present invention;

[0042] Fig.11 For the present invention Fig.10 The enlarged schematic diagram of point B in the middle;

[0043] Fig.12 For the present invention Fig.10 The enlarged schematic diagram of the center C;

[0044] Fig.13 For the present invention Fig.10 Enlarged schematic diagram of point D in the middle.

[0045] Reference numerals:

[0046] 100, test assembly; 110, base; 120, transformer; 130, output connector;

[0047] 200, voltage transfer mechanism; 210, base; 220, transfer terminal; 230, input connector;

[0048] 300, circuit to be tested; 310, cable; 320, upper terminal; 330, lower terminal;

[0049] 400, cable distance adjustment mechanism; 410, ground rail; 420, first support rod; 430, second support rod; 440, beam plate; 450, first bracket; 460, second bracket; 470, traction plate; 480, clamp seat; 490, hydraulic component;

[0050] 500, thread end simulation monitoring mechanism; 510, sampling assembly; 511, bottom sealing cover; 512, No. 2 sealing pad; 513, pressure-bearing rod; 514, second slide; 515, second scraper; 516, bottom anti-seepage pad; 520, monitoring assembly; 521, top sealing cover; 522, No. 1 sealing pad; 523, screw rod; 524, first slide; 525, first scraper; 526, top anti-seepage pad; 527, fastening chuck; 528, driving assembly; 529, chain; 530, sealing sleeve; 540, extension bolt; 550, external pipeline; 560, sealing pad; 570, temperature monitoring head; 580, drawer. DETAILED DESCRIPTION

[0051] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0052] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0053] A transformer partial discharge monitoring device provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0054] Embodiment 1:

[0055] Combination Figure 1-Figure 13 As shown, a transformer partial discharge monitoring device provided by the present invention includes a test component 100, a voltage transfer mechanism 200 and three groups of lines to be tested 300, a cable distance adjustment mechanism 400 arranged between the test component 100 and the voltage transfer mechanism 200, and multiple groups of line head simulation monitoring mechanisms 500 arranged on the cable distance adjustment mechanism 400.

[0056] The test assembly 100 includes a base 110, a transformer 120 and an output connector 130, the voltage transfer mechanism 200 includes a base 210, a transfer terminal 220 and an input connector 230, the line to be tested 300 includes a cable 310, an upper end 320 and a lower end 330, the cable distance adjustment mechanism 400 includes a ground rail 410, a first support rod 420, a second support rod 430, a beam plate 440, a first bracket 450, a second bracket 460, a traction plate 470, a clamp seat 480 and a hydraulic component 490, and the line head simulation monitoring mechanism 500 includes a sampling component 510, a monitoring component 520, a sealing sleeve 530, an extension bolt 540, an external pipe 550, a sealing gasket 560, a temperature monitoring head 570 and a drawer 580, and the sampling component 510 also includes a bottom sealing cover 511, a second sealing gasket 512, a pressure-bearing rod 513, a second slide 514, a second scraper 515 and a bottom anti-seepage pad 516, and the monitoring component 520 also includes a top sealing cover 521, a first sealing gasket 522, a screw 523, a first slide 524, a first scraper 525, a top anti-seepage pad 526, a fastening clamp 527, a driving component 528 and a chain 529.

[0057] The test assembly 100 includes an output connector 130 to be tested, a base 110 which is set in a specific laboratory and grounded, and a transformer 120 installed on the base 110. The number of the output connectors 130 is three, and the three output connectors 130 are set on the output line interface on the top of the transformer 120.

[0058] The voltage transfer mechanism 200 includes an input connector 230 to be tested, a grounded base 210, and three adapter terminals 220 installed in the base 210. The number of the input connectors 230 is three, and the three input connectors 230 are respectively installed on the input line interfaces on the tops of the three adapter terminals 220;

[0059] The terminal at the bottom of the transfer terminal 220 is connected with a current measuring wire;

[0060] The circuit to be tested 300 includes an upper terminal 320 connected to the output connector 130 , a lower terminal 330 connected to the input connector 230 , and a cable 310 installed between the upper terminal 320 and the lower terminal 330 ;

[0061] The cable distance adjustment mechanism 400 is used to adjust the distance between the multiple groups of line head simulation monitoring mechanisms 500 and the corresponding symmetrically distributed output connectors 130 and input connectors 230;

[0062] The wire end simulation monitoring mechanism 500 includes two lengthened bolts 540, a sampling assembly 510, a monitoring assembly 520, a temperature monitoring head 570 and an external pipe 550. The bottom of the upper end 320 and the lower end 330 are both provided with a sampling assembly 510, and the top of the upper end 320 and the lower end 330 are both provided with a monitoring assembly 520. The temperature monitoring head 570 is arranged in the sampling assembly 510. Two sealing pads 560 are arranged outside the lengthened bolt 540. The wire end simulation monitoring mechanism 500 also includes a sealing sleeve 530 for carrying the cable 310 and a drawer 580 for extracting new products.

[0063] After being overlapped, the sampling component 510 and the monitoring component 520 are built with an independent monitoring cavity, the temperature monitoring head 570 is used to detect the temperature in the independent monitoring cavity, the external pipe 550 is connected to the monitoring cavity, and the external pipe 550 is used to provide a variety of media to be tested to the independent monitoring cavity.

[0064] With the continuous development of economic construction, the requirements for power supply reliability are getting higher and higher. As one of the main equipment in the power system, the partial discharge detection of power transformers has also received more and more attention from the power industry. If partial discharge occurs in the transformer, it is very likely to cause premature damage to the transformer and affect the service life of the transformer. At the same time, partial discharge also directly affects the normal power supply of the region. Once the transformer fails, it will cause a large-scale power outage, resulting in huge economic losses.

[0065] Partial discharge has become one of the important causes of transformer failure. The detection of partial discharge of transformer needs to be carried out in a specific laboratory. The commonly used transformer partial discharge detection methods are pulse current method, ultrasonic method, etc., but these methods can only monitor the discharge problem of the transformer itself. Since the transformer is connected to the cable outdoors, the impact of external factors on the transformer discharge cannot be simulated in a specific laboratory. In addition, the outdoor cable detection cycle is long, the data is inaccurate, and it is easily affected by other factors.

[0066] The device provides independent monitoring cavities for the connection parts of the transformer and the cable in a specific laboratory, and different media are put into each group of independent monitoring cavities. When the bottom sealing cover 511 and the top sealing cover 521 are fixed by two lengthened bolts 540, the output connector 130 or the input connector 230 can be sealed and clamped by the bottom sealing cover 511 and the top sealing cover 521 in the overlapped state, and the upper end 320 connected to the output connector 130 and the lower end 330 connected to the input connector 230 can tighten the end of the cable 310. In the independently monitored cavity, the temperature monitoring heads 570 in each independently monitored cavity are monitored through the cloud. After the cloud receives the thermal energy data transmitted by each temperature monitoring head 570, a specified time period is set to extract the new products on the insulating materials at the ends of each cable 310. By comparing the gas chromatography detection data of the new products under constant voltage and current, uniform time period and different media, the anti-breakdown period of the insulation layer of the cable 310 can be shortened, and the anti-discharge effect of the cable 310 and the transformer joint under the influence of different external media factors can be monitored.

[0067] Embodiment 2:

[0068] Combination Figure 1-Figure 13 As shown, based on the embodiment 1, the cable distance adjustment mechanism 400 includes a ground rail 410 arranged on the laboratory floor;

[0069] The ground rail 410 is composed of three rails and end plates connected to the three rails, and two sets of clamps are installed on one of the rails, and hydraulic components 490 are installed in the two sets of clamps. The hydraulic components 490 are composed of a hydraulic sub-rod and a hydraulic mother rod, and a clamp seat 480 is installed on the top of the hydraulic sub-rod;

[0070] The clamping seat 480 is movably connected to two traction plates 470, and the two traction plates 470 are connected to two beam plates 440, one of the beam plates 440 is installed with three first support rods 420, and the other beam plate 440 is installed with three second support rods 430;

[0071] The three first support rods 420 and the three second support rods 430 are movably installed in the three tracks;

[0072] A first bracket 450 is fixedly mounted on the top end of the first support rod 420;

[0073] A second bracket 460 is fixedly mounted on the top end of the second support rod 430;

[0074] The first bracket 450 and the second bracket 460 are both composed of two Z-shaped ceramic brackets and a T-shaped insulating pad, and screw holes are provided at the top ends of the Z-shaped ceramic brackets.

[0075] By grounding the ground rail 410 as a whole and coating the surface of the ground rail 410, the first support rod 420 and the second support rod 430 with an insulating paint layer, when the hydraulic component 490 is running, the internal hydraulic sub-rod will cooperate with the clamp seat 480 to pull the two traction plates 470 at the same time, and then drive the two beam plates 440 to extend at equal intervals along the middle of the ground rail 410, and the multiple second brackets 460 respectively installed on the top of the three first support rods 420 and the three second support rods 430 will drive the multiple groups of wire head simulation monitoring mechanisms 500 to deliver to the multiple output connectors 130 and the multiple input connectors 230 after arrangement, and the first support rod 420 and the second support rod 430 with adjustable spacing can also simulate the test of the insulation performance of the cable insulation layer by different external pulling forces, and improve the protection work before the subsequent cable connection on the outdoor transformer according to the data obtained after the cable test;

[0076] At the same time, after the two ends of the cable 310 are pulled and straightened, with the operation of the transformer 120, the new products produced after the insulation layer is broken down by the discharge of the joint part of the transformer 120 and the cable 310 can be conveniently and safely extracted by the second scraper 515 and the first scraper 525, thereby avoiding the insulation layer being scratched over a large area and causing a short circuit during the test of the device.

[0077] Embodiment 3:

[0078] Combination Figure 4-Figure 13 As shown, on the basis of Example 1, the sampling assembly 510 includes a bottom sealing cover 511 located at the bottom of the cable end 310, a second sealing pad 512 installed in the inner groove of the bottom sealing cover 511, a bottom anti-seepage pad 516 arranged inside the bottom sealing cover 511, a pressure-bearing rod 513 installed between the bottom sealing cover 511 and the bottom anti-seepage pad 516, a second slide seat 514 movably installed on the pressure-bearing rod 513, and a second scraper 515 arranged on the second slide seat 514;

[0079] A rectangular storage bin is installed at the bottom of the bottom sealing cover 511, and a notch is opened at the top of the rectangular storage bin, and the notch is connected to the cavity of the bottom sealing cover 511;

[0080] Two symmetrically distributed rectangular columns are fixedly mounted on the top of the second slide seat 514 .

[0081] By movably installing the drawer 580 inside the rectangular storage bin, the inner cavity of the drawer 580 can be connected with its internal cavity through the slot on the top of the rectangular storage bin. When the insulation layer of the cable 310 is broken down by the current under different media and new products are generated, the second scraper 515 is pressed, and with the traction of the first scraper 525, the new products on the surface of the wire end can be scraped off without loss, and the fallen samples can enter the inner cavity of the drawer 580 along the slot.

[0082] Embodiment 4:

[0083] Combination Figure 4-Figure 13 As shown, in the above embodiment, the monitoring component 520 includes a top sealing cover 521 located at the top of the cable end 310, a No. 1 sealing pad 522 installed in the inner groove of the top sealing cover 521, a top anti-seepage pad 526 arranged inside the top sealing cover 521, and a driving component 528 installed on the top sealing cover 521;

[0084] A transverse hole is formed inside the top anti-seepage pad 526, and a first bearing is installed in the transverse hole. A slot is formed on the inner wall of the top sealing cover 521, and a second bearing is installed in the slot. A screw rod 523 is installed in the first bearing and the second bearing. A first slide seat 524 is provided on the screw rod 523, and a first scraper 525 is installed on the first slide seat 524.

[0085] The driving assembly 528 is composed of a chassis and a motor, and the gear of the motor transmission shaft and the gear at the outer end of the screw rod 523 are connected to each other by a chain 529;

[0086] The monitoring assembly 520 also includes two fastening clamps 527 installed in the top vertical pipe of the top sealing cover 521;

[0087] An L-shaped end pipe is installed at one end of the top sealing cover 521 close to the vertical pipe, and the external pipeline 550 is connected to the threaded end of the L-shaped end pipe.

[0088] The output connector 130 or the input connector 230 is sealed and clamped by using the symmetrically distributed No. 2 sealing gasket 512 and the No. 1 sealing gasket 522, and the upper end 320 or the lower end 330 is clamped by using the bottom anti-seepage pad 516 and the top anti-seepage pad 526. At this time, an independent monitoring cavity is formed inside the bottom sealing cover 511 and the top sealing cover 521 after being overlapped, so as to provide a safe detection environment for the connector and the insulating layer near the connector. As the medium is injected into each independent monitoring cavity, the arc of the discharge under monitoring will be in the independently monitored cavity, so that the safety inside the specific laboratory can be ensured during detection. At the same time, the temperature monitoring head 570 clamped by the two fastening clamps 527 can upload the data of thermal energy in the independent monitoring cavity in real time.

[0089] The working principle and use process of the present invention are as follows: the test assembly 100 and the voltage transfer mechanism 200 are pre-arranged on the ground of the discharge laboratory, and then the adjacent output connectors 130 and input connectors 230 are connected by using the circuit to be tested 300, and the input connector of the transformer 120 is connected to the cable to be tested, and then the current measuring wire is connected to the connector on the transfer terminal 220. At this time, the cable to be tested forms a simulated passage through the transformer 120, the circuit to be tested 300, the transfer terminal 220 and the current measuring wire. According to the gap between the test assembly 100 and the voltage transfer mechanism 200, when the hydraulic component 490 is running, the internal liquid After the hydraulic rod is lifted upward, the clamp seat 480 installed on the top of the hydraulic rod will pull the two traction plates 470 to shrink at the same speed. At this time, the second support rod 430 and the first support rod 420 pulled by the two traction plates 470 will move together at the same speed along the slideway inside the ground rail 410. At this time, the second bracket 460 installed on the second support rod 430 and the first bracket 450 installed on the first support rod 420 can adjust the two sets of line head simulation monitoring mechanisms 500 carried according to the gap between the test assembly 100 and the voltage transfer mechanism 200, until the two sets of line head simulation monitoring mechanisms 500 are accurately docked with the output connector 130 and the input connector 230 respectively;

[0090] The two lengthening bolts 540 are screwed out with a screwdriver, and two bottom sealing covers 511 are respectively arranged at the bottom of the output connector 130 and the input connector 230, and then two top sealing covers 521 are respectively arranged at the top of the output connector 130 and the input connector 230, and the stacked bottom sealing covers 511 and the top sealing covers 521 are locked and fixed with multiple lengthening bolts 540, and the second sealing gasket 512 and the first sealing gasket 522 arranged in one set of the bottom sealing covers 511 and the top sealing covers 521 are locked and fixed. The outer wall of the output connector 130 can be sealed and clamped, and the second sealing gasket 512 and the first sealing gasket 522 in the other set of bottom sealing cover 511 and the top sealing cover 521 will seal and clamp the pipe wall of the input connector 230. At this time, the upper end 320 and the lower end 330 can be sealed and clamped by the two sets of bottom sealing cover 511 and the top sealing cover 521, and the wire ends of the cable 310 connected to the upper end 320 and the lower end 330 respectively can be suspended and clamped by the built-in cavities of the two sets of bottom sealing cover 511 and the top sealing cover 521. Under the action of the gravity of the cable 310 itself, the portion of the cable 310 that is under pressure from the two sealing sleeves 530 can be in a straightened and tightened state, and then the nuts on the threaded sections of the two groups of bottom anti-seepage pads 516 and the top anti-seepage pads 526 in the two groups of bottom sealing covers 511 and the top sealing covers 521 are adjusted respectively. As the nuts are continuously tightened, the two groups of bottom anti-seepage pads 516 and the top anti-seepage pads 526 that are under pressure can clamp the pipe walls of the upper end 320 and the lower end 330 close to the cable 310 respectively. At this time, the bottom sealing covers 511 and the top sealing covers The cavity built in 521 can be in a sealed state, and then the temperature monitoring head 570 is clamped and connected to the vertical tube in the middle of the top surface of the top sealing cover 521 by using two sealing pads 560, and the two fastening clamps 527 in the vertical tube are adjusted until the two fastening clamps 527 lock the end of the temperature monitoring head 570, and at the same time, the external pipe 550 is connected to the L-shaped end pipe at the top of the top sealing cover 521. At this time, the line ends of the cable 310 close to the output connector 130 and the input connector 230 can be placed in a simulated environment for discharge testing;

[0091] Since the wiring of outdoor transformers needs to be handled manually, and the technical proficiency of manual wiring affects the safety of the transformer and cable interface, when the interface insulation is not sealed enough, the interface will discharge as the high-voltage current is transferred. As the discharge continues;

[0092] In severe cases, it will cause power loss and consume part of the power, thereby reducing the operating efficiency of the transformer;

[0093] It will damage the insulation material, accelerate its aging process, and shorten the service life of the transformer; if not handled in time, it may continue to develop and eventually lead to major accidents such as insulation breakdown and short circuit, causing serious losses to the power system;

[0094] Therefore, when the upper end 320 and the lower end 330 are connected to the output connector 130 and the input connector 230 respectively, the two ends of the cable 310 can be constrained by the independent monitoring environment set up by the two sets of line head simulation monitoring mechanisms 500. According to the changes in outdoor weather and environmental factors, water mist, hot steam flow and other media are transferred to the sealed cavity built into the bottom sealing cover 511 and the top sealing cover 521 through the external pipe 550. As the circuit of the device is continuously energized, the insulation layer of the cable 310 under different media can simulate the breakdown test of discharge under high voltage current. As the insulation layer is decomposed and destroyed, new products are formed on the surface of the insulation layer. The experimenter observes the temperature data transmitted by the temperature monitoring head 570 and determines When the motor in the driving component 528 is started, the lead screw 523 driven by the chain 529 will help the first slide 524 and the second slide 514 to move horizontally, and the second scraper 515 and the first scraper 525 can extract the new products on the insulation layer of the cable 310 at a regular time, and the extract can fall into the inner cavity of the drawer 580. By transferring different media to the inner cavities of multiple groups of sampling components 510 and monitoring components 520, after multiple groups of extracted samples are tested by gas chromatography, and the degree of damage to the insulation layer caused by discharge breakdown under different media is compared, it is possible to defend the insulation layer of the cable 310 against one or more media that are severely damaged, thereby providing effective protection against current breakdown before the transformer and the cable are connected.

[0095] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A transformer partial discharge monitoring device, comprising a test assembly (100), a voltage transfer mechanism (200) and three groups of lines to be tested (300), characterized in that: It also includes a cable distance adjustment mechanism (400) arranged between the test assembly (100) and the voltage transfer mechanism (200), and a plurality of groups of line head simulation monitoring mechanisms (500) arranged on the cable distance adjustment mechanism (400); The test assembly (100) comprises an output connector (130) to be tested; The voltage transfer mechanism (200) comprises an input connector (230) to be tested; The circuit to be tested (300) comprises an upper end (320) connected to the output connector (130), a lower end (330) connected to the input connector (230), and a cable (310) installed between the upper end (320) and the lower end (330); The cable distance adjustment mechanism (400) is used to adjust the distance between a plurality of groups of the cable end simulation monitoring mechanisms (500) and the corresponding symmetrically distributed output connectors (130) and the input connectors (230); The line end simulation monitoring mechanism (500) comprises a sampling component (510) arranged at the bottom of the line end of the cable (310), a monitoring component (520) arranged at the top of the line end of the cable (310), a temperature monitoring head (570) arranged in the sampling component (510), and an external pipe (550) arranged on the sampling component (510); After being stacked, the sampling assembly (510) and the monitoring assembly (520) have an independent monitoring cavity built in, the temperature monitoring head (570) is used to detect the temperature in the independent monitoring cavity, and the external pipe (550) is used to provide a variety of media to be tested to the independent monitoring cavity.

2. A transformer partial discharge monitoring device according to claim 1, characterized in that: The test assembly (100) further comprises a grounded base (110) and a transformer (120) mounted on the base (110); The number of the output connectors (130) is three, and the three output connectors (130) are arranged on the output line interface at the top of the transformer (120).

3. A transformer partial discharge monitoring device according to claim 1, characterized in that: The voltage transfer mechanism (200) further comprises a grounded base (210) and three transfer terminals (220) installed in the base (210); The number of the input connectors (230) is three, and the three input connectors (230) are respectively mounted on the input line interfaces at the tops of the three adapter terminals (220); A current measuring wire is connected to the terminal post at the bottom end of the transfer terminal (220).

4. A transformer partial discharge monitoring device according to claim 1, characterized in that: The cable distance adjustment mechanism (400) comprises a ground rail (410) arranged on the laboratory floor; The ground rail (410) is composed of three rails and end plates connected to the three rails, and two sets of clamps are installed on one of the rails, and hydraulic components (490) are installed in the two sets of clamps. The hydraulic components (490) are composed of a hydraulic sub-rod and a hydraulic mother rod, and a clamp seat (480) is installed on the top end of the hydraulic sub-rod; The clamp seat (480) is movably connected to two traction plates (470), and the two traction plates (470) are connected to two beam plates (440), one of the beam plates (440) having three first support rods (420) installed therein, and the other beam plate (440) having three second support rods (430) installed therein; The three first support rods (420) and the three second support rods (430) are movably installed in the three tracks.

5. A transformer partial discharge monitoring device according to claim 4, characterized in that: A first bracket (450) is fixedly mounted on the top end of the first support rod (420); A second bracket (460) is fixedly mounted on the top end of the second support rod (430); The first bracket (450) and the second bracket (460) are both composed of two Z-shaped ceramic brackets and a T-shaped insulating pad, and screw holes are provided at the top ends of the Z-shaped ceramic brackets.

6. A transformer partial discharge monitoring device according to claim 1, characterized in that: The thread end simulation monitoring mechanism (500) further comprises two lengthened bolts (540), two sealing pads (560) arranged outside the lengthened bolts (540), a sealing sleeve (530) for supporting the upper end head (320), and a drawer (580) for extracting new products.

7. A transformer partial discharge monitoring device according to claim 1, characterized in that: The sampling assembly (510) comprises a bottom sealing cover (511) located at the bottom of the line end of the upper end head (320), a second sealing gasket (512) installed in a groove inside the bottom sealing cover (511), a bottom anti-seepage gasket (516) arranged inside the bottom sealing cover (511), a pressure-bearing rod (513) installed between the bottom sealing cover (511) and the bottom anti-seepage gasket (516), a second slide seat (514) movably installed on the pressure-bearing rod (513), and a second scraper (515) arranged on the second slide seat (514).

8. A transformer partial discharge monitoring device according to claim 7, characterized in that: A rectangular storage bin is installed at the bottom of the bottom sealing cover (511), and a notch is opened at the top of the rectangular storage bin, the notch being connected to the cavity of the bottom sealing cover (511); Two symmetrically distributed rectangular columns are fixedly mounted on the top of the second sliding seat (514).

9. A transformer partial discharge monitoring device according to claim 1, characterized in that: The monitoring component (520) comprises a top sealing cover (521) located at the top of the line end of the upper end head (320), a No. 1 sealing gasket (522) installed in a groove inside the top sealing cover (521), a top anti-seepage gasket (526) arranged inside the top sealing cover (521), and a driving component (528) installed on the top sealing cover (521); The top anti-seepage pad (526) has a transverse hole formed inside, and a first bearing is installed in the transverse hole; the top sealing cover (521) has a slotted hole formed on its inner wall, and a second bearing is installed in the slotted hole; screw rods (523) are installed in the first bearing and the second bearing; a first sliding seat (524) is provided on the screw rod (523); and a first scraper (525) is installed on the first sliding seat (524); The driving assembly (528) is composed of a chassis and a motor, and a chain (529) is connected in a transmission manner between the gear of the transmission shaft of the motor and the gear at the outer end of the lead screw (523).

10. A transformer partial discharge monitoring device according to claim 9, characterized in that: The monitoring assembly (520) further comprises two fastening clamps (527) installed in the top vertical pipe of the top sealing cover (521); An L-shaped end pipe is installed at one end of the top sealing cover (521) close to the vertical pipe, and the external pipe (550) is connected to the threaded end of the L-shaped end pipe.

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