Switch cabinet partial discharge joint detection system

Abstract

The invention discloses a switch cabinet partial discharge joint detection system, and relates to the technical field of switch cabinet detection, the switch cabinet partial discharge joint detection system comprises a cabinet body and a limiting guide rail installed on the outer side surface of the cabinet body, the inner side of the limiting guide rail is provided with a limiting groove, one side of the upper end of the limiting guide rail is provided with an audible and visual alarm, and the limiting guide rail is provided with a sliding block. And a flexible ultrasonic sensor is mounted on the sliding block at the lower part of the limiting guide rail. Through the arrangement of the limiting guide rail, the sliding block, the mounting plate, the fastening bolt and the limiting block, sensors needed by a detection system are mounted on the mounting plate, the sliding block moves up and down in the limiting groove to adjust the distance between the sensors, and the joint detection effect between the sensors is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinet detection, and in particular to a switch cabinet partial discharge joint detection system. Background Art

[0002] With the continuous improvement of the power supply reliability requirements of the power system, the high-voltage switchgear directly carries the line outgoing load, which directly affects the power supply reliability of users. The high-voltage switchgear is one of the most numerous equipment in the primary equipment. According to the analysis of the fault types of high-voltage switchgear equipment, insulation faults are the most common, mainly manifested as insulation breakdown. Insulation faults can be monitored by live detection. From the experience of field operation, most insulation faults are accompanied by partial discharge in the early stage. Therefore, it is necessary to conduct partial discharge detection to discover the latent defects of the equipment in advance and take measures to avoid the development into faults. At present, the main methods for partial discharge detection of switchgear include ultra-high frequency, ultrasonic method, transient ground voltage and other methods.

[0003] When the existing switch cabinet partial discharge detection system is in use, the installation spacing of the detection sensors on the switch cabinet is inconvenient to adjust, which affects the detection effect between the sensors. At the same time, when the ultrasonic flexible probes in the existing detection system are in use, most of them lack a structure that is convenient for applying the coupling agent, making it inconvenient to apply the coupling agent on the probe end. Moreover, in the existing equipment with a coupling agent adding structure, the connection of the device for injecting the coupling agent is mostly connected by a threaded pressing sealing ring, and the injection component needs to be twisted to achieve assembly and disassembly, which is inconvenient to operate. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a switch cabinet partial discharge joint detection system. By setting a limit guide rail, a sliding block, a mounting plate, fastening bolts and a limit block, the sensors required by the detection system are installed on the mounting plate. The distance between the sensors is adjusted by moving the sliding block up and down in the limit groove to ensure the joint detection effect between the sensors, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a switch cabinet partial discharge joint detection system, comprising a cabinet body and a limit guide rail installed on the outer side of the cabinet body, a limit groove is arranged on the inner side of the limit guide rail, an audible and visual alarm is arranged on one side of the upper end of the limit guide rail, a sliding block is installed on the limit guide rail, a flexible ultrasonic sensor is installed on the sliding block at the lower part of the limit guide rail, and an ultrasonic flexible probe is connected to the flexible ultrasonic sensor through a signal line.

[0006] Furthermore, the sliding block includes: a mounting plate, a fastening bolt and a limit block, the mounting plate is connected to the limit block slot, and the fastening bolt is connected to the limit block via a thread.

[0007] Furthermore, a protective cover is provided at one end of the ultrasonic flexible probe, a handle is provided at a side of the ultrasonic flexible probe away from the protective cover, and an elastic rope is provided at the lower side of the protective cover and the ultrasonic flexible probe.

[0008] Furthermore, a coupling agent push tube is provided on the upper side of the ultrasonic flexible probe, and a semi-annular cavity is provided on the upper part of one end of the ultrasonic flexible probe close to the protective cover.

[0009] Furthermore, the coupling agent push tube includes a syringe, an injection head integrally formed at the end of the syringe, a hard joint tube arranged on one side of the syringe, a connecting hose fixed on one side of the hard joint tube, a plurality of elastic avoidance grooves opened on the outer circumferential surface of the injection head, an elastic block integrally formed on the injection head and located on one side of the elastic avoidance groove, a tapered clamp integrally formed at the end of the elastic block, square grooves opened on the outer circumferential surface of the hard joint tube in the same number as the elastic blocks, a movable ring movably arranged on the periphery, a release dial head integrally formed on the inner wall of the movable ring and located inside the square groove, and an arc surface integrally formed at the end of the release dial head.

[0010] Furthermore, the movable ring is slidably connected to the outer wall of the hard joint tube, the elastic avoidance grooves are evenly distributed along the circumference of the hard joint tube, the elastic blocks are evenly distributed along the circumference of the outer cylindrical surface of the injection head, the width of the square groove is greater than the width of the elastic block, and the arc surface has the same diameter as the outer cylindrical surface of the injection head.

[0011] Furthermore, the hard joint tube is located at one end of the injection head and has a stepped hole structure, and a sealing groove is provided at the step of the stepped hole, an elliptical sealing ring is clamped inside the seal, and the hard joint tube and the injection head are clamped into the square groove through the tapered clamp to achieve a limited connection, and the hard joint tube and the injection head are sealed by the elliptical sealing ring.

[0012] Furthermore, a smear scraper is integrally formed on a side of the protective cover facing the ultrasonic flexible probe, and the flexible ultrasonic sensor is connected to an earphone via a signal line.

[0013] Furthermore, a high-frequency current transformer is arranged on the upper side of the flexible ultrasonic sensor, a transient potential sensor is arranged on the upper side of the high-frequency current transformer, and an ultra-high frequency partial discharge sensor is arranged on the upper side of the transient potential sensor.

[0014] Furthermore, the limiting guide rail and the sliding block are connected via the limiting block and the fastening bolts, and the mounting plate is made of stainless steel.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The invention provides a limit rail, a sliding block, a mounting plate, a fastening bolt and a limit block, so that the sensors required by the detection system are mounted on the mounting plate, and the distance between the sensors is adjusted by moving the sliding block up and down in the limit groove, thereby ensuring the joint detection effect between the sensors; 2. The invention provides an ultrasonic flexible probe, a coupling agent push tube, a protective cover, a semi-annular cavity and a smear scraper, so that when the coupling agent is applied to the probe end, the coupling agent is squeezed out from the semi-annular cavity to between the protective cover and the probe end through the coupling agent push tube, and then the protective cover is rotated so that the smear scraper on the inside of the protective cover evenly applies the coupling agent on the probe end, thereby ensuring the detection accuracy of the probe.

[0016] 3. The invention can ensure that the arc surface of the end of the release head can be driven to slide on the outer surface of the injection head through the sliding movable ring, and then the tapered clamp can be pushed to deviate into the elastic avoidance groove to separate it from the square groove, so that the injection head can be easily pulled out, and the coupling agent can be easily extracted through the syringe for the second time. The operation is simple and more convenient, which solves the trouble of constantly rotating the syringe during the existing threaded connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention in a separated state; Figure 2 It is a schematic diagram of the enlarged structure of the sliding block in the present invention; Figure 3 For the present invention Figure 1 A schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a schematic diagram of the structure of the ultrasonic flexible probe in the present invention; Figure 5 It is a schematic diagram of the side structure of the protective cover in the present invention; Figure 6 It is a schematic diagram of the main cross-sectional structure of the end of the ultrasonic flexible probe in the present invention; Figure 7 It is a side view structural schematic diagram of the end of the ultrasonic flexible probe in the present invention; Figure 8 It is a partial cross-sectional view of the coupling agent pushing tube portion in the present invention; Fig. 9 For the present invention Figure 8 A partial enlarged view of the middle A; Fig.10 It is a left view of the movable ring in the present invention.

[0018] In the figure: 1. cabinet; 2. limit guide rail; 3. ultra-high frequency partial discharge sensor; 4. transient potential sensor; 5. high frequency current transformer; 6. flexible ultrasonic sensor; 7. sliding block; 8. ultrasonic flexible probe; 9. earphone; 10. limit groove; 11. coupling agent push tube; 1101. syringe; 1102. connecting hose; 1103. hard joint pipe; 11031. square groove; 1104. injection head; 1105. movable ring; 11051. release dial head; 11052. arc surface; 1106. elastic avoidance groove; 1107. elastic block; 1108. taper clamp; 1109. sealing groove; 1110. elliptical sealing ring; 12. handle; 13. protective cover; 14. elastic rope; 15. smear scraper; 16. semi-ring cavity; 17. sound and light alarm. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-7 This embodiment provides a technical solution: a switch cabinet partial discharge joint detection system, including a cabinet body 1 and a limit guide rail 2 installed on the outer surface of the cabinet body 1, a limit groove 10 is arranged on the inner side of the limit guide rail 2, an audible and visual alarm 17 is arranged on one side of the upper end of the limit guide rail 2, a sliding block 7 is installed on the limit guide rail 2, a flexible ultrasonic sensor 6 is installed on the sliding block 7 at the lower part of the limit guide rail 2, and an ultrasonic flexible probe 8 is connected to the flexible ultrasonic sensor 6 through a signal line.

[0021] See also Figure 1-7 This embodiment provides a technical solution: a switch cabinet partial discharge joint detection system, including a cabinet body 1 and a limit guide rail 2 installed on the outer surface of the cabinet body 1, a limit groove 10 is arranged on the inner side of the limit guide rail 2, an audible and visual alarm 17 is arranged on one side of the upper end of the limit guide rail 2, a sliding block 7 is installed on the limit guide rail 2, a flexible ultrasonic sensor 6 is installed on the sliding block 7 at the lower part of the limit guide rail 2, and an ultrasonic flexible probe 8 is connected to the flexible ultrasonic sensor 6 through a signal line.

[0022] like Figure 1-10As shown, when the switch cabinet is subjected to partial discharge detection, the ultra-high frequency partial discharge sensor 3, the transient potential sensor 4, the high frequency current transformer 5 and the flexible ultrasonic sensor 6 are fixed on the mounting plate 701, and then the limit block 703 on the sliding block 7 is slidably connected with the limit groove 10 of the limit guide rail 2, the upper and lower spacing of the sliding block 7 is adjusted, and then the sliding block 7 is pressed into the limit groove 10 by the fastening bolt 702, so that the sliding block 7 and the limit guide rail 2 are connected and fixed, and the ultra-high frequency partial discharge sensor 3 can detect the ultra-high frequency electromagnetic wave signal generated by the discharge of the switch cabinet, and the transient potential sensor 4 ... The sensor 4 can detect the transient potential to the ground generated on the shell of the switch cabinet, and the high-frequency current transformer 5 can detect the change of the discharge current on the line. The detection personnel wear headphones 9 and press the ultrasonic flexible probe 8 against the shell of the switch cabinet to detect the ultrasonic waves generated by local discharge. When it is necessary to apply the coupling agent, the coupling agent is squeezed into the gap between the protective cover 13 and the ultrasonic flexible probe 8 through the coupling agent push tube 1111, and then the protective cover 13 is rotated so that the coating scraper 15 on the inside of the protective cover 13 evenly applies the coupling agent on the end face of the probe to ensure the detection accuracy of the probe.

[0023] The sliding block 7 includes: a mounting plate 701, a fastening bolt 702 and a limit block 703. The mounting plate 701 is connected to the limit block 703 by a slot. The fastening bolt 702 is connected to the limit block 703 by a thread. The fastening bolt 702 can tighten and fix the sliding block 7 on the limit groove 10 of the limit guide rail 2, so that the spacing between the sliding blocks 7 can be adjusted.

[0024] A protective cover 13 is provided at one end of the ultrasonic flexible probe 8, a handle 12 is provided on the side of the ultrasonic flexible probe 8 away from the protective cover 13, and an elastic rope 14 is provided on the protective cover 13 and the lower side of the ultrasonic flexible probe 8. When the ultrasonic flexible probe 8 is not in use, the protective cover 13 can be covered on the ultrasonic flexible probe 8 to protect the probe.

[0025] A coupling agent push tube 1111 is provided on the upper side of the ultrasonic flexible probe 8, and a semi-annular cavity 16 is provided on the upper part of one end of the ultrasonic flexible probe 8 close to the protective cover 13. The semi-annular cavity 16 allows the coupling agent to be squeezed into the gap between the protective cover 3 and the ultrasonic flexible probe 8.

[0026] The coupling agent push tube 11 comprises a syringe 1101, an injection head 1104 integrally formed at the end of the syringe 1101, a hard joint tube 1103 arranged at one side of the syringe 1101, a connecting hose 1102 fixed at one side of the hard joint tube 1103, a plurality of elastic avoidance grooves 1106 opened on the outer circumferential surface of the injection head 1104, an elastic block 1107 integrally formed on the injection head 1104 and located at one side of the elastic avoidance groove 1106, a tapered clamp 1108 integrally formed at the end of the elastic block 1107, and a connection hose 1102 fixed at one side of the hard joint tube 1103 and a plurality of elastic avoidance grooves 1106 opened on the outer circumferential surface of the hard joint tube 1103. 107, an equal number of square grooves 11031, a movable ring 1105 movably arranged on the periphery, a release dial 11051 integrally formed on the inner wall of the movable ring 1105 and located inside the square groove 11031, and an arc surface 11052 integrally formed at the end of the release dial 11051. By pressing the injection head 1104 hard, the injection head 1104 can be inserted into the hard joint tube 1103. Under the elastic force of the elastic block 1107, the tapered clamp 1108 can be clamped into the square groove 11031 to achieve connection limiting, and the operation is simpler and more convenient.

[0027] The movable ring 1105 is slidably connected to the outer wall of the hard joint tube 1103, the elastic avoidance grooves 1106 are evenly distributed along the circumference of the hard joint tube 1103, the elastic blocks 1107 are evenly distributed along the circumference of the outer cylindrical surface of the injection head 1104, the width of the square groove 11031 is greater than the width of the elastic block 1107, and the arc surface 11052 is the same as the diameter of the outer cylindrical surface of the injection head 1104.

[0028] By adopting the above technical solution, it can be ensured that the arc surface 11052 at the end of the release head 11051 can be driven by the sliding movable ring 1105 to slide on the outer cylindrical surface of the injection head 1104, and then the tapered clamp 1108 can be pushed to offset into the elastic avoidance groove 1106, so that it is separated from the square groove 11031, and then the injection head 1104 can be easily pulled out, and then the coupling agent can be easily extracted for the second time through the syringe 1101. The operation is simple and more convenient, which solves the trouble of constantly rotating the syringe 1101 during the existing threaded connection.

[0029] The hard joint tube 1103 is located at one end of the injection head 1104 and is a step hole structure, and a sealing groove 1109 is opened at the step of the step hole, and an elliptical sealing ring 1110 is clamped inside the seal. The hard joint tube 1103 and the injection head 1104 are clamped into the square groove 11031 through the tapered clamp 1108 to achieve a limited connection, and the hard joint tube 1103 and the injection head 1104 are sealed by the elliptical sealing ring 1110.

[0030] After adopting the above technical solution, the elliptical sealing ring 1110 can be clamped between the hard joint tube 1103 and the injection head 1104 to achieve the sealing of the connection.

[0031] A coating scraper 15 is integrally formed on one side of the protective cover 13 facing the ultrasonic flexible probe 8. The flexible ultrasonic sensor 6 is connected to the earphone 9 via a signal line. The coating scraper 15 is rotated so that the coating scraper 15 can evenly coat the coupling agent on the probe end surface.

[0032] A high-frequency current transformer 5 is arranged on the upper side of the flexible ultrasonic sensor 6 , a transient potential sensor 4 is arranged on the upper side of the high-frequency current transformer 5 , and an ultra-high frequency partial discharge sensor 3 is arranged on the upper side of the transient potential sensor 4 .

[0033] The limiting guide rail 2 is connected to the sliding block 7 via the limiting block 703 and the fastening bolts 702, and the mounting plate 701 is made of stainless steel.

[0034] The working principle of the switch cabinet partial discharge joint detection system provided by the present invention is as follows: Figure 1-Figure 10As shown, when the switch cabinet is subjected to partial discharge detection, the ultra-high frequency partial discharge sensor 3, the transient potential sensor 4, the high-frequency current transformer 5 and the flexible ultrasonic sensor 6 are fixed on the mounting plate 701, and then the limit block 703 on the sliding block 7 is slidably connected with the limit groove 10 of the limit guide rail 2, the spacing between the upper and lower sliding blocks 7 is adjusted, and then the sliding block 7 is pressed into the limit groove 10 by the fastening bolt 702, so that the sliding block 7 and the limit guide rail 2 are connected and fixed, the ultra-high frequency partial discharge sensor 3 can detect the ultra-high frequency electromagnetic wave signal generated by the discharge of the switch cabinet, the transient potential sensor 4 can detect the transient potential to the ground generated on the shell of the switch cabinet, and the high-frequency current transformer 5 can detect the discharge current change on the line. The detection personnel wear headphones 9, and the ultrasonic flexible probe 8 is pressed against the shell of the switch cabinet to detect the ultrasonic wave generated by the partial discharge. When the coupling agent needs to be applied, the coupling agent is squeezed out to the protective cover 13 and the ultrasonic flexible probe 8 through the coupling agent push tube 1111. The gap between the two probes 8 is formed, and then the protective cover 13 is rotated so that the coating scraper 15 inside the protective cover 13 evenly coats the coupling agent on the end face of the probe to ensure the detection accuracy of the probe. By pressing the injection head 1104 hard, the injection head 1104 can be inserted into the hard joint tube 1103. Under the elastic force of the elastic block 1107, the tapered clamp 1108 can be clamped into the square groove 11031 to achieve connection limit, which makes the operation simpler and more convenient, and can ensure that the sliding movable ring 1105 can drive the arc surface 11052 at the end of the release head 11051 to slide on the outer cylindrical surface of the injection head 1104, and then push the tapered clamp 1108 to deviate into the elastic avoidance groove 1106, so that it is separated from the square groove 11031, and then it is convenient to pull out the injection head 1104, and then it is convenient to extract the coupling agent for the second time through the syringe 1101. The operation is simple and more convenient, which solves the trouble of constantly rotating the syringe 1101 during the existing threaded connection.

[0035] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A switch cabinet partial discharge combined detection system, comprising a cabinet body (1) and a limit rail (2) installed on the outer side of the cabinet body (1), characterized in that: A limiting groove (10) is arranged on the inner side of the limiting guide rail (2), an audible and visual alarm (17) is arranged on one side of the upper end of the limiting guide rail (2), a sliding block (7) is installed on the limiting guide rail (2), a flexible ultrasonic sensor (6) is installed on the sliding block (7) at the lower part of the limiting guide rail (2), and an ultrasonic flexible probe (8) is connected to the flexible ultrasonic sensor (6) via a signal line.

2. A switch cabinet partial discharge joint detection system according to claim 1, characterized in that: The sliding block (7) comprises: a mounting plate (701), a fastening bolt (702) and a limiting block (703); the mounting plate (701) is connected to the limiting block (703) by a slot, and the fastening bolt (702) is connected to the limiting block (703) by a thread.

3. A switch cabinet partial discharge joint detection system according to claim 1, characterized in that: A protective cover (13) is provided at one end of the ultrasonic flexible probe (8), a handle (12) is provided on a side of the ultrasonic flexible probe (8) away from the protective cover (13), and an elastic rope (14) is provided on the lower side of the protective cover (13) and the ultrasonic flexible probe (8).

4. A switch cabinet partial discharge joint detection system according to claim 3, characterized in that: A coupling agent push tube (11) is provided on the upper side of the ultrasonic flexible probe (8), and a semi-annular cavity (16) is provided on the upper portion of one end of the ultrasonic flexible probe (8) close to the protective cover (13).

5. A switch cabinet partial discharge joint detection system according to claim 4, characterized in that: The coupling agent push tube (11) comprises a syringe (1101), an injection head (1104) integrally formed at the end of the syringe (1101), a hard joint tube (1103) arranged on one side of the syringe (1101), a connecting hose (1102) fixed on one side of the hard joint tube (1103), a plurality of elastic avoidance grooves (1106) formed on the outer circumferential surface of the injection head (1104), and an elastic block (1106) integrally formed on the injection head (1104) and located on one side of the elastic avoidance grooves (1106). 107), a tapered clamp (1108) integrally formed at the end of the elastic block (1107), square grooves (11031) of the same number as the elastic block (1107) opened on the outer circumferential surface of the hard joint tube (1103), a movable ring (1105) movably arranged on the periphery, a release dial (11051) integrally formed on the inner wall of the movable ring (1105) and located inside the square groove (11031), and an arc surface (11052) integrally formed at the end of the release dial (11051).

6. A switch cabinet partial discharge joint detection system according to claim 5, characterized in that: The movable ring (1105) is slidably connected to the outer wall of the hard joint tube (1103), the elastic avoidance grooves (1106) are evenly distributed along the circumference of the hard joint tube (1103), the elastic blocks (1107) are evenly distributed along the circumference of the outer cylindrical surface of the injection head (1104), the width of the square groove (11031) is greater than the width of the elastic block (1107), and the arc surface (11052) has the same diameter as the outer cylindrical surface of the injection head (1104).

7. A switch cabinet partial discharge joint detection system according to claim 5, characterized in that: The hard joint tube (1103) is located at one end of the injection head (1104) and has a stepped hole structure, and a sealing groove (1109) is provided at the step of the stepped hole. An elliptical sealing ring (1110) is clamped inside the seal. The hard joint tube (1103) and the injection head (1104) are clamped into the square groove (11031) via the tapered clamp (1108) to achieve a limited connection. The hard joint tube (1103) and the injection head (1104) are sealed via the elliptical sealing ring (1110).

8. A switch cabinet partial discharge joint detection system according to claim 3, characterized in that: A smear scraper (15) is integrally formed inside the protective cover (13) on one side facing the ultrasonic flexible probe (8), and the flexible ultrasonic sensor (6) is connected to an earphone (9) via a signal line.

9. A switch cabinet partial discharge joint detection system according to claim 1, characterized in that: A high-frequency current transformer (5) is arranged on the upper side of the flexible ultrasonic sensor (6), a transient potential sensor (4) is arranged on the upper side of the high-frequency current transformer (5), and an ultra-high frequency partial discharge sensor (3) is arranged on the upper side of the transient potential sensor (4).

10. A switch cabinet partial discharge joint detection system according to claim 2, characterized in that: The limiting guide rail (2) and the sliding block (7) are connected via the limiting block (703) and the fastening bolts (702), and the mounting plate (701) is made of stainless steel.

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