Cable insulation on-line monitoring device

Abstract

The invention discloses a cable insulation on-line monitoring device, and belongs to the field of power equipment monitoring, the cable insulation on-line monitoring device comprises a partial discharge collector, the bottom of the partial discharge collector is provided with a connecting line through a connector lug, the connecting line is electrically connected with the partial discharge collector, and one end, far away from the partial discharge collector, of the connecting line is provided with an HFCT sensor; the partial discharge collector is provided with an installation assembly, the partial discharge collector can realize multi-angle and multi-position installation through the installation assembly, the bottom of the partial discharge collector is provided with an interface protection mechanism at a position outside the connector lug, and the HFCT sensor is provided with a dustproof protection mechanism. Dustproof and waterproof protection of the connector lug position of the partial discharge collector and anti-falling protection of the connecting position of the connecting line and the connector lug are achieved through the interface protection mechanism. According to the cable insulation on-line monitoring device, through arrangement of the interface protection mechanism and the dustproof protection mechanism, the safety of the monitoring device can be improved, and the accuracy of the monitoring device can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment monitoring, and in particular to an online cable insulation monitoring device. Background Art

[0002] Cable insulation plays a vital role in cable structure. On the one hand, it prevents current from entering the surrounding environment or other conductors through the wire or cable sheath, preventing electrical accidents such as electric shock and short circuit. On the other hand, it protects the internal conductor from mechanical damage, chemical corrosion and environmental conditions. In addition, it also controls the electric field distribution inside the cable, reduces the risk of breakdown caused by electric field concentration, and ensures the stability and efficiency of power transmission.

[0003] The quality of insulation has a great impact on the service life, safety and durability of wires and cables. In order to ensure the safety of cable insulation, certain technical means need to be adopted to monitor the insulation status of cables. Online monitoring of cable insulation uses online monitoring technology to monitor cable insulation in real time, promptly detect and deal with potential faults, and improve the reliability and safety of cable operation. Compared with the regular inspection method of checking the insulation condition of the cable, online monitoring can more quickly and promptly detect problems such as insulation damage, aging or moisture, and issue early warnings for abnormal conditions and potential faults, assisting operation and maintenance personnel to carry out repair or replacement work in a timely manner.

[0004] The current method used for online monitoring of cable insulation status is the partial discharge method, which evaluates the insulation status by detecting the pulse current signal or ultrasonic pressure wave generated by partial discharge. When the partial discharge method is used for monitoring, the HFCT sensor is installed on the cable. During use, the connection between the sensor and the cable is not tight due to thermal expansion and contraction. When there is a gap between the sensor and the cable, dust and water are easily introduced. In addition, the connection between the sensor and the signal collector will become loose after long-term use, resulting in inaccurate monitoring results during online monitoring. Summary of the invention

[0005] The purpose of the present invention is to propose a cable insulation online monitoring device to solve the problem that the connection between the existing sensor and the cable is not tight due to thermal expansion and contraction, which is easy to enter dust and water, resulting in inaccurate monitoring results during the online monitoring process.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technology: an online monitoring device for cable insulation, comprising a partial discharge collector, a connecting wire electrically connected to the partial discharge collector is arranged at the bottom of the partial discharge collector through a wiring head, and an HFCT sensor is arranged at one end of the connecting wire away from the partial discharge collector, a mounting assembly is arranged on the partial discharge collector, and the partial discharge collector can be installed at multiple angles and positions through the mounting assembly, an interface protection mechanism is arranged at the bottom of the partial discharge collector at a position outside the wiring head, and a dust protection mechanism is arranged on the HFCT sensor; The interface protection mechanism is used to realize dust and water proof protection of the wiring head position of the partial discharge collector and anti-detachment protection of the connection position of the connecting wire and the wiring head, and the dust proof protection mechanism is used to realize sealing protection of the connection position of the HFCT sensor.

[0007] As a further description of the above technical solution: the interface protection mechanism includes a mounting tube fixed at the bottom position of the partial discharge collector, a positioning plate is arranged in the mounting tube, and a movable plate that cooperates with the positioning plate and can move is arranged on the mounting tube through a driving assembly, and a through opening for the connecting line to pass through is formed between the positioning plate and the movable plate.

[0008] As a further description of the above technical solution: the driving assembly includes an adjusting screw that passes through the mounting tube through a bolt seat, and one end of the adjusting screw located in the mounting tube is connected to the movable plate cargo track through a connecting head.

[0009] As a further description of the above technical solution: the number of the through openings is several and corresponds one-to-one with the number of the terminal heads, and a gasket made of rubber material is arranged on the inner wall of the through opening.

[0010] As a further description of the above technical solution: the dust protection mechanism includes a fixed cover arranged on the HFCT sensor through a positioning plate, and a sealing compensation component is arranged on the fixed cover.

[0011] As a further description of the above technical solution: the sealing compensation component includes a rubber pad, a connecting rod penetrating the fixed cover is arranged on the rubber pad, and a spring located between the rubber pad and the fixed cover is sleeved on the connecting rod.

[0012] As a further description of the above technical solution: one end of the connecting rod away from the rubber pad is provided with a limiting nut abutting against the outer side surface of the fixing cover through a threaded end.

[0013] As a further description of the above technical solution: the mounting assembly includes a fixing frame fixed to the top and bottom of the partial discharge collector, and the fixing frame is movably connected with a mounting plate for its installation and positioning, the fixing frame is provided with a slot, and the mounting plate is provided with a connecting piece that cooperates with the slot and can move along the length direction of the slot.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The sealing compensation component on the HFCT sensor can prevent dust and water from entering the contact position between the sensor and the cable, which can ensure the normal operation of the HFCT sensor, prevent dust and moisture from interfering with the sensor's induction of partial discharge signals, reduce interference from external factors, and enable the sensor to more accurately obtain the weak high-frequency current signal generated by the cable partial discharge, thereby improving the accuracy of the monitoring data; A protection mechanism is set at the interface of the partial discharge collector to clamp the connecting wire, which can prevent the connecting wire from loosening and detaching, avoid signal transmission interruption or poor contact that leads to loss of monitoring data or generation of erroneous signals, ensure the stability of signal transmission, ensure that the monitoring system can work continuously and stably, reduce equipment failures caused by connection problems, and enhance the reliability of the entire cable insulation online monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structure provided by the embodiment of the present invention is shown Figure 1 ; Figure 2 The overall structure provided by the embodiment of the present invention is shown Figure 2 ; Figure 3 It shows a schematic diagram of the structure of an interface protection mechanism provided according to an embodiment of the present invention; Figure 4 A schematic diagram of a local structure provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of a driving assembly provided according to an embodiment of the present invention is shown; Figure 6 A schematic structural diagram of a dust protection mechanism provided according to an embodiment of the present invention is shown; Figure 7 A schematic structural diagram of a sealing compensation assembly provided according to an embodiment of the present invention is shown; Figure 8 A structural schematic diagram of an installation component provided according to an embodiment of the present invention is shown.

[0016] Legend: 1. Partial discharge collector; 2. Terminal block; 3. Connecting wire; 4. HFCT sensor; 5. Mounting assembly; 51. Fixing bracket; 52. Mounting plate; 53. Notch; 54. Connector; 6. Interface protection mechanism; 61. Mounting tube; 62. Positioning plate; 63. Moving plate; 64. Driving assembly; 641. Bolt seat; 642. Adjusting screw; 643. Connecting head; 65. Through port; 651. Washer; 7. Dust protection mechanism; 71. Positioning plate; 72. Fixing cover; 73. Sealing compensation assembly; 731. Rubber pad; 732. Connecting rod; 733. Spring; 734. Threaded end; 735. Limit nut. DETAILED DESCRIPTION

[0017] 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.

[0018] Reference Figure 1-Figure 8 The present embodiment provides an online monitoring device for cable insulation, comprising a partial discharge collector 1, a connecting wire 3 electrically connected to the partial discharge collector 1 is provided at the bottom through a terminal head 2, and a HFCT sensor 4 is provided at one end of the connecting wire 3 away from the partial discharge collector 1, a mounting assembly 5 is provided on the partial discharge collector 1, and the partial discharge collector 1 can be installed at multiple angles and positions through the mounting assembly 5, an interface protection mechanism 6 is provided at the bottom of the partial discharge collector 1 outside the terminal head 2, a dustproof protection mechanism 7 is provided on the HFCT sensor 4, dustproof and waterproof protection of the terminal head 2 of the partial discharge collector 1 and anti-detachment protection of the connecting wire 3 and the terminal head 2 are achieved through the interface protection mechanism 6, and sealing protection of the connection position of the HFCT sensor 4 is achieved through the dustproof protection mechanism 7.

[0019] In the present invention, the HFCT sensor 4 is installed on the cable, and the HFCT sensor 4 is connected to the wiring head 2 of the partial discharge collector 1 through the connecting line 3. The partial discharge collector 1 is fixed by the mounting assembly 5. When the partial discharge method is used to monitor the cable insulation, the partial discharge pulse current signal in the cable body is coupled by the HFCT sensor 4 installed on the grounding wire of the cable joint. The coupled pulse signal is transmitted to the partial discharge collector 1 through the coaxial cable. The partial discharge collector 1 amplifies the analog signal and converts it into a digital signal after analog-to-digital conversion and then transmits it to the monitoring host, thereby realizing the online monitoring of cable insulation. When the HFCT sensor 4 is connected to the cable, the dust protection mechanism 7 can realize the sealing between the connection position and the cable to prevent dust and water from entering the contact position between the sensor and the cable, thereby ensuring the normal operation of the HFCT sensor 4. After the connecting line 3 of the HFCT sensor 4 is connected to the wiring head 2 of the partial discharge collector 1, it is protected by the interface protection mechanism 6 to prevent the connecting line 3 from loosening and detaching, thereby avoiding the phenomenon of signal transmission interruption or poor contact leading to loss of monitoring data or generation of erroneous signals.

[0020] It should be noted that the mounting assembly 5 includes a fixing frame 51 fixed to the top and bottom of the partial discharge collector 1, and a mounting plate 52 for mounting and positioning is movably connected to the fixing frame 51. A notch 53 is provided on the fixing frame 51, and a connecting piece 54 that cooperates with the notch 53 and can move along the length direction of the notch 53 is provided on the mounting plate 52. When installing the partial discharge collector 1, the mounting plate 52 on the fixing frame 51 is adjusted according to the on-site installation conditions and installation needs. The mounting plate 52 is installed on the notch 53 of the fixing frame 51 in a hanging ring manner through the connecting piece 54, so that the mounting plate 52 can be rotated and moved, so that the partial discharge collector 1 can adapt to various installation environments.

[0021] Specifically, Figure 2-Figure 5 As shown, the interface protection mechanism 6 includes a mounting tube 61 fixed at the bottom position of the partial discharge collector 1, a positioning plate 62 is arranged in the mounting tube 61, and a movable plate 63 that cooperates with the positioning plate 62 and can move is arranged on the mounting tube 61 through a driving component 64, and a through hole 65 for the connecting line 3 to pass through is formed between the positioning plate 62 and the movable plate 63, and the driving component 64 includes an adjusting screw 642 that penetrates the mounting tube 61 through a bolt seat 641, and one end of the adjusting screw 642 located in the mounting tube 61 is connected to the movable plate 63 through a connecting head 643. The number of the through holes 65 is several and corresponds to the number of the terminal heads 2 one by one, and a gasket 651 made of rubber is arranged on the inner wall of the through hole 65.

[0022] Specifically, when the connecting wire 3 is connected to the terminal head 2 of the partial discharge collector 1, the adjusting screw 642 on the bolt seat 641 is first screwed to drive the movable plate 63 to move through the connecting head 643, so that the distance between the movable plate 63 and the positioning plate 62 becomes larger. At this time, the distance between the movable plate 63 and the positioning plate 62 is sufficient for the connection of the connecting wire 3. After the connecting wire 3 is connected to the terminal head 2, the adjusting screw 642 is screwed in the opposite direction so that the adjusting screw 642 drives the movable plate 63 to move in the direction of the positioning plate 62. As the movable plate 63 is against the positioning plate 62, the connecting wire 3 is stuck on the movable plate 63. In the through opening 65 between the positioning plate 62, the gasket 651 in the through opening 65 ensures the stability of the connecting wire 3 in the through opening 65, on the one hand to prevent the connecting wire 3 from being crushed, on the other hand to play a role of buffer protection, and by clamping the connecting wire 3 through the interface protection mechanism 6, it can prevent the connecting wire 3 from loosening and detaching, avoid signal transmission interruption or poor contact resulting in loss of monitoring data or generation of erroneous signals, ensure the stability of signal transmission, ensure that the monitoring system can work continuously and stably, reduce equipment failures caused by connection problems, and enhance the reliability of the entire cable insulation online monitoring device.

[0023] Specifically, Figure 2 , Figure 6 and Figure 7 As shown, the dust protection mechanism 7 includes a fixed cover 72 arranged on the HFCT sensor 4 through a positioning plate 71, a sealing compensation component 73 is arranged on the fixed cover 72, and the sealing compensation component 73 includes a rubber pad 731, a connecting rod 732 penetrating the fixed cover 72 is arranged on the rubber pad 731, and a spring 733 located between the rubber pad 731 and the fixed cover 72 is sleeved on the connecting rod 732, and a limiting nut 735 abutting against the outer side of the fixed cover 72 is arranged at one end of the connecting rod 732 away from the rubber pad 731 through a threaded end 734.

[0024] Among them, when the HFCT sensor 4 is connected to the cable, the sealing compensation component 73 in the fixed cover 72 is fixed on the HFCT sensor 4 through the positioning plate 71. At this time, the rubber pad 731 is tightly pressed against the cable under the action of the spring 733 of the connecting rod 732. When a connection gap appears between the HFCT sensor 4 and the cable due to thermal expansion and contraction, the extrusion of the spring 733 can ensure that the rubber pad 731 is always tightly attached to the cable, preventing dust and water from entering the contact position between the sensor and the cable, which can ensure the normal operation of the HFCT sensor 4, prevent dust and moisture from interfering with the sensor's induction of partial discharge signals, reduce interference from external factors, and enable the sensor to more accurately obtain the weak high-frequency current signal generated by the partial discharge of the cable, thereby improving the accuracy of the monitoring data. When the rubber pad 731 needs to be disassembled and replaced, the limit nut 735 on the threaded end 734 of the connecting rod 732 can be removed to remove the rubber pad 731 from the fixed cover 72, which is simple and convenient.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cable insulation online monitoring device, characterized in that: The invention comprises a partial discharge collector (1), wherein a connection line (3) electrically connected to the partial discharge collector (1) is arranged at the bottom of the partial discharge collector (1) via a connection head (2), and an HFCT sensor (4) is arranged at one end of the connection line (3) away from the partial discharge collector (1), wherein a mounting assembly (5) is arranged on the partial discharge collector (1), and the partial discharge collector (1) can be installed at multiple angles and multiple positions via the mounting assembly (5), wherein an interface protection mechanism (6) is arranged at a position outside the connection head (2) at the bottom of the partial discharge collector (1), and a dustproof protection mechanism (7) is arranged on the HFCT sensor (4); dustproof and waterproof protection is achieved at the connection head (2) position of the partial discharge collector (1) via the interface protection mechanism (6), and anti-detachment protection is achieved at the connection position of the connection line (3) and the connection head (2), and sealing protection is achieved at the connection position of the HFCT sensor (4) via the dustproof protection mechanism (7).

2. A cable insulation online monitoring device according to claim 1, characterized in that: The interface protection mechanism (6) comprises a mounting tube (61) fixed at the bottom of the partial discharge collector (1), a positioning plate (62) being arranged in the mounting tube (61), and a movable plate (63) which cooperates with the positioning plate (62) and is movable is arranged on the mounting tube (61) via a driving assembly (64), and a through hole (65) for the connection line (3) to pass through is formed between the positioning plate (62) and the movable plate (63).

3. A cable insulation online monitoring device according to claim 2, characterized in that: The driving assembly (64) comprises an adjusting screw (642) that passes through the mounting tube (61) via a bolt seat (641); one end of the adjusting screw (642) located inside the mounting tube (61) is connected to the cargo track of the moving plate (63) via a connecting head (643).

4. A cable insulation online monitoring device according to claim 3, characterized in that: The number of the through openings (65) is a plurality and corresponds one-to-one to the number of the wiring heads (2); a gasket (651) made of a rubber material is provided on the inner wall of the through opening (65).

5. The cable insulation online monitoring device according to claim 1, characterized in that: The dust protection mechanism (7) comprises a fixed cover (72) arranged on the HFCT sensor (4) via a positioning plate (71), and a sealing compensation component (73) is arranged on the fixed cover (72).

6. A cable insulation online monitoring device according to claim 5, characterized in that: The sealing compensation component (73) comprises a rubber pad (731), the rubber pad (731) is provided with a connecting rod (732) penetrating the fixed cover (72), and the connecting rod (732) is sleeved with a spring (733) located between the rubber pad (731) and the fixed cover (72).

7. A cable insulation online monitoring device according to claim 6, characterized in that: One end of the connecting rod (732) away from the rubber pad (731) is provided with a limiting nut (735) abutting against the outer side surface of the fixing cover (72) through a threaded end (734).

8. The cable insulation online monitoring device according to claim 1, characterized in that: The mounting assembly (5) comprises a fixing frame (51) fixed to the top and bottom of the partial discharge collector (1), a mounting plate (52) for mounting and positioning the fixing frame (51) being movably connected thereto, a notch (53) being provided on the fixing frame (51), and a connecting piece (54) being provided on the mounting plate (52) which cooperates with the notch (53) and can move along the length direction of the notch (53).

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