CN210954228U

CN210954228U - Partial discharge detection sensor

Info

Publication number: CN210954228U
Application number: CN201921623485.4U
Authority: CN
Inventors: 王异凡; 龚金龙; 宋琦华; 王一帆; 曾振源; 刘江明; 孙正竹; 马涛; 夏晓波; 杜赟; 楼钢; 徐翀; 朱亮; 毛永铭; 黄继来; 周迅; 盛骏; 吴胥阳; 吴尊东; 汪桢毅
Original assignee: Shanghai Jiaotong University; Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Current assignee: Shanghai Jiaotong University; Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-07-07
Anticipated expiration: 2029-09-27

Abstract

The utility model discloses a partial discharge detection sensor belongs to power equipment technical field, and aim at overcomes the longer defect of current sensor and host computer connecting cable. The sensor comprises a shell with a cable hole, a first cavity and a second cavity surrounding the cable hole are arranged on the shell, the first cavity and the second cavity are separated from each other and communicated through a threading slot hole, an integrated circuit board and a battery are arranged in the first cavity, a signal transmitting antenna is mounted on the shell and connected with the integrated circuit board, the battery is connected with the integrated circuit board, a magnetic core surrounding the cable hole is arranged in the second cavity, and the integrated circuit board is connected with the magnetic core. The utility model provides a partial discharge detection sensor because integrated circuit board connects signal emission antenna, can transmit the signal that the sensor was collected for corresponding host computer through wireless mode, avoids the cable between sensor and the host computer to connect, improves partial discharge detection efficiency.

Description

Partial discharge detection sensor

Technical Field

The utility model belongs to the technical field of power equipment, a partial discharge detection sensor is related to.

Background

With the development of urbanization, power cables are widely applied, and the problem of faults in the operation of the cables is increasingly shown. In order to ensure the reliability of power supply, it is important to detect a running cable and grasp the running state of the cable in time, and particularly in recent years, a cable partial discharge detection technology becomes a research hotspot in the power industry.

The partial discharge detection method of the power cable mainly comprises a high-frequency electromagnetic coupling method, an ultrahigh-frequency method and an ultrasonic method, wherein when a broadband electromagnetic coupling method is adopted to detect partial discharge signals in the cable, a high-frequency partial discharge sensor is sleeved on a cable body or a grounding wire of the cable to detect flowing high-frequency pulse current signals, and the high-frequency pulse current signals are connected with a conditioning unit or a detector host through a cable. For many occasions, such as cable towers, cable tunnels, cable wells, cable trenches and the like, the connection distance between the sensor and the subsequent unit is long, the wiring is complex, and the general cable is difficult to meet the requirements. The above situation can greatly reduce the efficiency of the cable field partial discharge detection.

Disclosure of Invention

The utility model discloses the problem to prior art existence provides partial discharge detection sensor, and aim at overcomes the longer defect of current sensor and host computer connecting cable.

The utility model discloses a realize like this:

the partial discharge detection sensor comprises a shell with a cable hole, and is characterized in that a first cavity and a second cavity surrounding the cable hole are arranged on the shell, the first cavity and the second cavity are separated from each other and are communicated through a threading slot hole, an integrated circuit board and a battery are arranged in the first cavity, a signal transmitting antenna is mounted on the shell and is connected with the integrated circuit board, the battery is connected with the integrated circuit board, a magnetic core surrounding the cable hole is arranged in the second cavity, and the integrated circuit board is connected with the magnetic core.

When the cable partial discharge detection device is used, a cable to be detected penetrates through a cable hole, when a high-frequency partial discharge condition is generated in the cable, the magnetic core of the sensor is coupled with a partial discharge signal and transmits the signal to the integrated circuit board, and the integrated circuit board sends the signal to the corresponding host through the signal transmitting antenna. The integrated circuit board is connected with the signal transmitting antenna, signals collected by the sensor can be transmitted to the corresponding host in a wireless mode, cable connection between the sensor and the host is avoided, partial discharge detection efficiency is improved, the cavities where the integrated circuit board and the battery are located and the cavity where the magnetic core is located are isolated from each other, mutual interference is reduced, and accuracy of the sensor is improved.

Preferably, the first cavity and the second cavity have openings facing the same side, and a detachable cover plate is arranged on the housing to cover the openings. This facilitates the disassembly and assembly of the components within the housing.

Preferably, an insulating washer is disposed between the housing and the magnetic core. Therefore, the interference of the outside to the magnetic core can be reduced, and the detection accuracy is improved.

Preferably, the housing protrudes upward at a lateral edge of the cable hole to form a convex ring, the insulating gasket includes a lower portion, a middle portion and an upper portion, the lower portion abuts against the bottom wall of the second cavity, the middle portion is attached to a side wall of the convex ring, and the upper portion is attached to an upper end face of the convex ring. The magnetic core is sleeved on the convex ring, the convex ring can limit the magnetic core to move, and the shape of the insulating washer considers each part of the magnetic core which can be contacted with the shell, so that the possibility of contact between the magnetic core and the shell is reduced.

Preferably, the casing includes first casing and the second casing that can alternate segregation, the cable hole is equallyd divide into two parts and is located respectively first casing with on the second casing, the magnetic core divide into two parts and is located first casing and second casing respectively, insulating washer divide into two parts and is located respectively in first casing and the second casing, the apron divide into two parts and covers respectively and establish on first casing and the second casing, first cavity is located on the first casing. Therefore, the cable can be embedded into the cable hole only by opening the cable hole, the cable does not need to be arranged in the cable hole in a penetrating mode from the head, and installation and arrangement of the sensor are facilitated.

Preferably, one end of the first shell and one end of the second shell are hinged to each other, and the other ends of the first shell and the second shell are clamped through a clamping structure. Therefore, the part loss of parts caused by the complete separation of the first shell and the second shell can be avoided, and the repeated disassembly and assembly of the sensor are facilitated.

Preferably, the joint structure includes tapered end and locking plate, the tapered end is fixed on the first casing and for the end wall protrusion of first casing, the bulge has the locked groove, the mounting groove has on the second casing, the locking plate can install with reciprocating the mounting groove, the lockhole has on the locking plate, the tapered end passes the lockhole, the locked groove card is in on the locking plate, the lower extreme of locking plate with set up the spring between the second casing. Therefore, the clamping structure can be hidden in the shell, and the attractiveness of the sensor and the smoothness of the appearance are improved.

Preferably, the second shell is provided with a step hole communicated with the mounting groove, the diameter of the lower end part of the step hole is larger than that of the upper end part of the step hole, a button is arranged in the step hole, and the diameter of the lower end part of the button is larger than that of the upper end part of the button. Thus, the clamping structure can be opened by pressing the button.

Preferably, the diameter of the outer end part of the lock head is gradually reduced from inside to outside, a concave arc-shaped groove is formed in the lower hole wall of the lock hole, and the arc-shaped groove is matched with the profile of the lock head at the position of the lock groove. Thus facilitating the clamping and blocking of the lock head.

Preferably, the second cavity is provided with a cavity, and the cavity is communicated with the first cavity through a threading slotted hole. The concave cavity facilitates the arrangement of the outgoing lines of the magnetic core.

The utility model provides a partial discharge detection sensor because integrated circuit board connects signal emission antenna, can pass through wireless mode transmission with the signal that the sensor was collected and give corresponding host computer, avoids the cable between sensor and the host computer to connect, improves partial discharge detection efficiency, and the place cavity and the magnetic core place cavity mutual isolation of integrated circuit board and battery reduce mutual interference, improve the accuracy of sensor.

Drawings

Fig. 1 is a schematic structural diagram of a sensor.

Fig. 2 is a schematic diagram of an exploded structure of the sensor.

Fig. 3 is a schematic diagram of the internal structure of the sensor.

Fig. 4 is a schematic diagram of an exploded structure of the housing.

Fig. 5 is a schematic structural view of the lock and the locking plate when the lock and the locking plate are not clamped.

Fig. 6 is a schematic structural view of the lock head and the locking plate when the lock head and the locking plate are clamped.

Reference is made to the accompanying drawings in which: 100. a first housing; 110. a first cavity; 120. a signal transmitting antenna; 130. a battery; 200. a second housing; 210. a second cavity; 211. a concave cavity; 212. threading slotted holes; 213. a convex ring; 300. a cover plate; 400. a magnetic core; 500. an insulating washer; 610. a lock head; 611. locking the groove; 620. a locking plate; 621. a lock hole; 622. an arc-shaped slot; 630. a button; 640. mounting grooves; 700. a cable hole.

Detailed Description

The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and master. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The present embodiment provides a partial discharge detection sensor, as shown in fig. 1 to 6, including a case, a cap plate 300, a magnetic core 400, an insulating gasket 500, an integrated circuit board, and a battery 130. The casing has a cable hole 700, the overall shape of the casing is an irregular octagon, and the cable hole 700 is located at the middle position of the casing. The housing is divided into the first housing 100 and the second housing 200 by the central portion of the cable hole 700, that is, the cable hole 700 is divided into two parts and is respectively located on the first housing 100 and the second housing 200. The cover plate 300, the magnetic core 400, and the insulating washer 500 are disposed on the first casing 100 and the second casing 200 in two parts, specifically, the magnetic core 400 is disposed in the first casing 100 and the second casing 200 in two parts, the insulating washer 500 is disposed in the first casing 100 and the second casing 200 in two parts, and the cover plate 300 is disposed on the first casing 100 and the second casing 200 in two parts. The housing is made of metal material, the box cover is made of metal material the same as the housing, and the housing and the cover plate 300 form a shielding box together. The first and

second cavities

110 and 210 have openings facing the same side, and the cover plate 300 covers the openings.

Referring to fig. 2, 3 and 4, the housing has a first cavity 110 and a second cavity 210 surrounding the cable hole 700, the ic board and the battery 130 are installed in the first cavity 110, and the magnetic core 400 is installed in the second cavity 210, so as to reduce mutual interference. The first cavity 110 is located on the first housing 100.

The first cavity 110 and the second cavity 210 are spaced apart from each other and communicate through the wire passing slot 212. The magnetic core 400 includes an iron core and a coil wound around the iron core, the coil is connected to an ic board, and the connection wire passes through the threading slot 212, and the threading slot 212 in this embodiment is a slot structure, so that the connection wire can be easily inserted.

Referring to fig. 3 and 4, the second cavity 210 has a cavity 211, and the cavity 211 is communicated with the first cavity 110 through a wire-passing slot 212, that is, the wire-passing slot 212 is located at the cavity 211, and the cavity 211 is used for facilitating the arrangement of the lead wires of the winding of the magnetic core 400.

The signal transmitting antenna 120 is installed on the housing, the signal transmitting antenna 120 is connected with the integrated circuit board, the battery 130 is connected with the integrated circuit board, the magnetic core 400 surrounding the cable hole 700 is arranged in the second cavity 210, and the integrated circuit board is connected with the magnetic core 400. The battery 130 supplies power to the whole sensor, and the integrated circuit board can transmit the detected partial discharge signal of the cable to a corresponding host computer provided with the wireless receiving device through the signal transmitting antenna 120.

An insulating washer 500 is provided between the case and the magnetic core 400 for avoiding contact therebetween. The housing protrudes upward at the lateral edge of the cable hole 700 to form a convex ring 213, the insulating gasket 500 includes a lower portion, a middle portion and an upper portion, the lower portion abuts against the bottom wall of the second cavity 210, the middle portion is attached to the lateral wall of the convex ring 213, and the upper portion is attached to the upper end surface of the convex ring 213. Thus, the cross section of the insulating washer 500 is formed in a zigzag shape, and the case and the magnetic core 400 can be relatively completely isolated. The insulating washer 500 is made of plastic with good insulating property and good mechanical property, and is integrally a circular ring. The cover plate 300 is detachably fixed to the housing by screws, and the insulating washer 500 is just pressed and fixed after the cover plate 300 is mounted. After the magnetic core 400 is mounted, epoxy resin is poured into the second cavity 210 to protect and fix the magnetic core 400.

One ends of the first casing 100 and the second casing 200 are hinged to each other, and the other ends are clamped by a clamping structure. The clamping structure comprises a locking head 610 and a locking plate 620, the locking head 610 is fixed on the first shell 100 and protrudes relative to the end wall of the first shell 100, the protruding part is provided with a locking groove 611, the second shell 200 is provided with a mounting groove, the locking plate 620 can be mounted in the mounting groove in a vertically moving manner, the locking plate 620 is provided with a locking hole 621, the locking head 610 penetrates through the locking hole 621, the locking groove 611 is clamped on the locking plate 620, and a spring is arranged between the lower end of the locking plate 620 and the second shell 200. The second housing 200 has a stepped hole communicated with the mounting groove 640, the diameter of the lower end of the stepped hole is greater than that of the upper end of the stepped hole, the button 630 is disposed in the stepped hole, the diameter of the lower end of the button 630 is greater than that of the upper end of the button 630, the diameter of the lower end of the button 630 is matched with that of the lower end of the stepped hole, and the diameter of the upper end of the button 630 is matched with that of the upper end of the stepped hole. When the sensor needs to be detached, the button 630 is pressed to enable the locking plate 620 to go down against the elastic force of the spring, when the locking plate 620 is separated from the locking groove 611, as shown in fig. 5, the locking head 610 can be pulled out from the locking hole 621, so that the clamping structure is opened, and thus the first shell 100 and the second shell 200 can rotate relative to each other based on the hinged position, so that the cable hole 700 opens a port for the cable to enter and exit, and the sensor can be detached from the cable; when a sensor needs to be installed, the sensor is opened and a cable is clamped, and then the first shell 100 and the second shell 200 are folded, so that the lock head 610 penetrates through the lock hole 621, the lock head 610 can press the lock plate 620 to overcome the elastic force of the spring to move downwards, or the lock plate 620 moves downwards by pressing the button 630, in this embodiment, the diameter of the outer end portion of the lock head 610 is gradually reduced from inside to outside, the lock head 610 can automatically press the lock plate 620 to move downwards, when the lock plate 620 reaches the lock groove 611, the lock plate 620 is embedded into the lock groove 611 under the action of the spring to realize clamping, as shown in fig. 6.

The lower hole wall of the locking hole 621 is provided with a downward-concave arc-shaped groove 622, and the arc-shaped groove 622 is matched with the profile of the locking head 610 at the locking groove 611. When locking plate 620 is blocked in keyway 611 like this, locking head 610 also imbeds arc groove 622 at keyway 611, and arc groove 622 can inject locking head 610 better for the clamping state of clamping structure is more stable.

Four round holes are formed in the first housing 100, and are used for mounting a power switch, a charging indicator lamp, a charging hole, and a signal transmitting antenna 120, respectively.

Claims

1. The partial discharge detection sensor comprises a shell with a cable hole (700), and is characterized in that a first cavity (110) and a second cavity (210) surrounding the cable hole (700) are arranged on the shell, the first cavity (110) and the second cavity (210) are mutually separated and communicated through a wire penetrating slotted hole (212), an integrated circuit board and a battery (130) are arranged in the first cavity (110), a signal transmitting antenna (120) is installed on the shell, the signal transmitting antenna (120) is connected with the integrated circuit board, the battery (130) is connected with the integrated circuit board, a magnetic core (400) surrounding the cable hole (700) is arranged in the second cavity (210), and the integrated circuit board is connected with the magnetic core (400).

2. The partial discharge detection sensor of claim 1 wherein the first cavity (110) and the second cavity (210) have openings facing the same side, the housing having a removable cover plate (300) covering the openings.

3. The partial discharge detection sensor according to claim 2, wherein an insulating gasket (500) is provided between the housing and the magnetic core (400).

4. The partial discharge detection sensor according to claim 3, wherein the housing is upwardly protruded at a side edge of the cable hole (700) to form a convex ring (213), and the insulating gasket (500) includes a lower portion abutting on a bottom wall of the second cavity (210), a middle portion abutting on a side wall of the convex ring (213), and an upper portion abutting on an upper end surface of the convex ring (213).

5. The partial discharge detection sensor according to claim 4, wherein the housing includes a first housing (100) and a second housing (200) that can be separated from each other, the cable hole (700) is divided into two parts and is respectively located on the first housing (100) and the second housing (200), the magnetic core (400) is divided into two parts and is respectively located in the first housing (100) and the second housing (200), the insulating washer (500) is divided into two parts and is respectively located in the first housing (100) and the second housing (200), the cover plate (300) is divided into two parts and is respectively disposed on the first housing (100) and the second housing (200), and the first cavity (110) is located on the first housing (100).

6. The partial discharge detection sensor according to claim 5, wherein one end of the first casing (100) and one end of the second casing (200) are hinged to each other, and the other end is clamped by a clamping structure.

7. The partial discharge detection sensor of claim 6, wherein the clamping structure comprises a locking head (610) and a locking plate (620), the locking head (610) is fixed on the first casing (100) and protrudes out relative to the end wall of the first casing (100), the protruding portion has a locking groove (611), the second casing (200) has a mounting groove, the locking plate (620) can be mounted on the mounting groove in a vertically movable manner, the locking plate (620) has a locking hole (621), the locking head (610) passes through the locking hole (621), the locking groove (611) is clamped on the locking plate (620), and a spring is arranged between the lower end of the locking plate (620) and the second casing (200).

8. The partial discharge detection sensor according to claim 7, wherein the second housing (200) has a stepped hole communicating with the mounting groove (640), a diameter of a lower end of the stepped hole is larger than a diameter of an upper end of the stepped hole, a push button (630) is provided in the stepped hole, and a diameter of a lower end of the push button (630) is larger than a diameter of an upper end of the push button (630).

9. The partial discharge detection sensor of claim 7, wherein the diameter of the outer end of the lock cylinder (610) is gradually reduced from inside to outside, the lower hole wall of the lock hole (621) is provided with a downward-concave arc-shaped groove (622), and the arc-shaped groove (622) is matched with the profile of the lock cylinder (610) at the lock groove (611).

10. The partial discharge detection sensor according to any one of claims 1 to 9, wherein the second chamber (210) has a cavity (211) therein, and the cavity (211) communicates with the first chamber (110) through a through-wire slot (212).