CN220650760U

CN220650760U - Open-close type transformer core grounding current monitoring device

Info

Publication number: CN220650760U
Application number: CN202321992074.9U
Authority: CN
Inventors: 石柳; 卢步环; 武治轩; 谭位; 胡春雷; 祝愿博
Original assignee: Wuhan Anjisilei Electrical Technology Co ltd
Current assignee: Wuhan Anjisilei Electrical Technology Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-03-22
Anticipated expiration: 2033-07-27

Abstract

The utility model provides an open-close type transformer core grounding current monitoring device, which comprises an open-close type current transformer, wherein a first channel for a grounding conductor to be tested to pass through is arranged in the middle of the open-close type current transformer; the outside of the open-close type current transformer is provided with a detachable shell, and the top surface and the bottom surface of the shell are provided with through holes corresponding to the first channel; the inside of the shell is provided with a current collection plate, and the current collection plate is electrically connected with the open-close type current transformer and is used for collecting the current of the grounding conductor to be tested; the bottom of the shell is provided with a fixing bracket for fixing the shell on the grounding conductor to be tested. According to the utility model, the current flowing on the grounding conductor of the transformer core is detected through the open-close type current transformer, the grounding conductor of the transformer core is not required to be disassembled during installation, the transformer is not required to stop running after power failure, the normal running of the transformer is not influenced during the installation process, the installation can be completed by only one person, and the practicability of the monitoring device is improved.

Description

Open-close type transformer core grounding current monitoring device

Technical Field

The utility model relates to the technical field of power equipment, in particular to an open-close type transformer core grounding current monitoring device.

Background

Along with the rapid development of railway industry, especially the high-speed development of high-speed railway lines, the reliability of a traction power supply system is one of factors for guaranteeing the normal operation of railway lines, and a traction transformer is important as power transformation equipment for transforming electric energy sent by an electric power transmission line into voltage suitable for rolling stock. The transformer core is normally grounded and only a bit is grounded, and since a levitation bit is generated between the transformer core and the ground, there is a grounding current, which normally has a very small value. However, when a line or equipment fails, two or more points of the transformer core are grounded, a loop is formed between the core and the ground, and the grounding current is increased by many times. The fault is not easy to detect in the initial stage, and the iron core is easy to be locally overheated and damage the insulation, so that more serious faults are formed.

The existing transformer core grounding current monitoring device is huge in size, and the transformer core grounding conductor needs to be detached during installation, so that not only is the operation performed by multiple persons needed, but also the traction transformer needs to be installed after power failure and operation quit, and the practicability of the monitoring equipment is greatly reduced. Therefore, the utility model provides an open-close type transformer core grounding current monitoring device.

Disclosure of Invention

The utility model provides an open-close type transformer core grounding current monitoring device, which solves the problems that a transformer core grounding conductor needs to be disassembled when monitoring equipment in the prior art is installed, a traction transformer can be installed after power failure exits operation, the practicability is poor and the like.

The technical scheme of the utility model is realized as follows:

the open-close type transformer core grounding current monitoring device comprises an open-close type current transformer, wherein a first channel for a grounding conductor to be tested to pass through is formed in the middle of the open-close type current transformer; the outside of the open-close type current transformer is provided with a detachable shell, and the top surface and the bottom surface of the shell are provided with through holes corresponding to the first channel; the inside of the shell is provided with a current collection plate, and the current collection plate is electrically connected with the open-close type current transformer and is used for collecting the current of the grounding conductor to be tested; the bottom of the shell is provided with a fixing bracket for fixing the shell on the grounding conductor to be tested.

According to the utility model, the current flowing on the grounding conductor of the transformer core is detected through the open-close type current transformer, the grounding conductor of the transformer core is not required to be disassembled when the monitoring device is installed, the transformer is not required to be stopped from running in a power failure, and the normal operation of the transformer is not influenced in the installation process; and through setting up detachable casing in the outside of current transformer, make things convenient for monitoring devices's installation and dismantlement, only need one person can accomplish the installation, improved monitoring devices's practicality.

As a preferable scheme of the utility model, the open-close type current transformer comprises a transformer male head and a transformer female head, the transformer male head and the transformer female head are connected in a plugging manner, a plug is arranged at the open end of the transformer male head, a socket is arranged at the open end of the transformer female head, and the detachable connection of the transformer male head and the transformer female head is realized through the cooperation of the plug and the socket.

As a preferable scheme of the utility model, an insulating sleeve is arranged in the shell, and the insulating sleeve is detachably sleeved on the male head of the transformer and is used for isolating the current transformer from the grounding conductor to be tested;

the insulation sleeve comprises two box bodies which are oppositely arranged and are provided with openings at two ends, the rear ends of the two box bodies are connected in a sealing way through a connecting plate, and the distance between the two box bodies is matched with the thickness of the first channel; the front end of box body is equipped with the connection frame, the middle part of connection frame is equipped with the shrouding, the width of shrouding matches with the interval between two box bodies, the shrouding surrounds with the curb plate and the connecting plate that two box bodies are relative and forms the second passageway that supplies the earthing conductor to await measuring to pass, the external contour of second passageway matches with the internal contour of first passageway.

According to the utility model, the insulating sleeve is sleeved on the male head of the transformer, so that the grounding conductor to be detected and the current transformer can be effectively isolated, and the influence of the leakage of the grounding conductor to be detected on the accuracy of a monitoring result is avoided.

As a preferable scheme of the utility model, the shell comprises a left shell, a right shell and a middle shell, wherein the left shell and the right shell are respectively arranged on the left side end face and the right side end face of the middle shell through screws, through holes corresponding to the first channel are formed in the top surface and the bottom surface of the middle shell, and the fixing bracket is arranged on the bottom surface of the middle shell; through design split type detachable casing, make things convenient for monitoring devices's installation and dismantlement.

As the preferable scheme of the utility model, the current collecting plate is arranged in the right shell, the bottom surface of the right shell is provided with the waterproof connector for connecting the communication cable and the power supply cable, and the waterproof performance of the shell can be further improved by arranging the waterproof connector on the bottom surface of the right shell.

As a preferable scheme of the utility model, a display screen is arranged on the side surface of the shell, and the display screen is electrically connected with the current acquisition board; the display screen comprises a nixie tube, a protection panel and a fixing frame, wherein the protection panel is clamped between the nixie tube and the fixing frame, and the fixing frame is used for fixing the nixie tube and the protection panel on the side face of the shell; the display screen is arranged on the side face of the shell, so that current monitoring data can be checked on site conveniently, and the digital tube can be protected by arranging the protection panel on the outer side of the digital tube.

As a preferable scheme of the utility model, the fixing bracket comprises two L-shaped fixing plates which are oppositely arranged, the two fixing plates are respectively arranged at two sides of a through hole on the bottom surface of the shell, and a gap between the two fixing plates is used for clamping a grounding conductor to be tested; the top surface that fixed plate and casing bottom surface are connected is equipped with a plurality of waist round holes, adjusts the interval between two fixed plates through waist round hole, can be suitable for the earthing conductor that awaits measuring of different thickness.

Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the utility model, the current flowing on the grounding conductor of the transformer core is detected through the open-close type current transformer, the grounding conductor of the transformer core is not required to be disassembled when the monitoring device is installed, the transformer is not required to be stopped from running in a power failure, and the normal operation of the transformer is not influenced in the installation process; the detachable shell is arranged outside the current transformer, so that the installation and the disassembly of the monitoring device are convenient, the installation can be completed by only one person, and the practicability of the monitoring device is improved;

(2) According to the utility model, the insulation sleeve is sleeved on the male head of the transformer, so that the grounding conductor to be detected and the current transformer can be effectively isolated, and the influence of the leakage of the grounding conductor to be detected on the accuracy of a monitoring result is avoided;

(3) According to the utility model, the display screen is arranged on the side surface of the shell, so that current monitoring data can be checked on site conveniently, and the digital tube can be protected by arranging the protection panel on the outer side of the digital tube;

(4) According to the utility model, the two fixing plates are arranged on the bottom surface of the shell to clamp and fix the grounding conductor to be tested, and the plurality of waist-shaped round holes are formed in the top surface, connected with the bottom surface of the shell, of the fixing plates, so that the distance between the two fixing plates can be adjusted, and the grounding conductor to be tested with different thicknesses can be conveniently adapted.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of an open-close type transformer core grounding current monitoring device according to the present utility model;

fig. 2 is a perspective view of an open-close type transformer core grounding current monitoring device according to the present utility model;

FIG. 3 is a schematic diagram illustrating an assembly structure of an insulating sleeve and a connecting frame according to an embodiment of the present utility model;

in the figure: 1. a transformer male; 2. a transformer female head; 3. a first channel; 4. a through hole; 5. a current collection plate; 6. an insulating sleeve; 7. a case body; 8. a connecting plate; 9. a connection frame; 10. a sealing plate; 11. a second channel; 12. a left housing; 13. a right housing; 14. an intermediate housing; 15. a waterproof joint; 16. a display screen; 17. a nixie tube; 18. a protective panel; 19. a fixed frame; 20. a fixing plate; 21. waist round hole.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 3, the embodiment provides an open-close type transformer core grounding current monitoring device, which comprises an open-close type current transformer, wherein a first channel 3 for a grounding conductor to be tested to pass through is arranged in the middle of the open-close type current transformer; the outside of the open-close type current transformer is provided with a detachable shell, and the top surface and the bottom surface of the shell are provided with through holes 4 corresponding to the first channel 3; a current collection plate 5 is arranged in the shell, and the current collection plate 5 is electrically connected with an open-close type current transformer and is used for collecting current of a grounding conductor to be tested (the grounding conductor to be tested in the embodiment is flat steel); the bottom of the shell is provided with a fixing bracket for fixing the shell on the grounding conductor to be tested.

According to the embodiment, the open-close type current transformer is used for detecting the current flowing on the grounding conductor of the transformer core, the grounding conductor of the transformer core is not required to be disassembled when the monitoring device is installed, the transformer is not required to be stopped from running after power failure, and the normal operation of the transformer is not influenced in the installation process; and through setting up detachable casing in the outside of current transformer, make things convenient for monitoring devices's installation and dismantlement, only need one person can accomplish the installation, improved monitoring devices's practicality.

As the preferred scheme of this embodiment, open-close type current transformer includes the public first 1 of mutual-inductor and the female first 2 of mutual-inductor, the public first 1 of mutual-inductor is connected through the mode of pegging graft with the female first 2 of mutual-inductor, and the open end of the public first 1 of mutual-inductor is equipped with the plug, and the open end of the female first 2 of mutual-inductor is equipped with the socket, realizes the public first 1 of mutual-inductor and the female first 2 of mutual-inductor detachable connection through the cooperation of plug and socket. The open-close type current transformer in this embodiment may be an existing current transformer, such as CTSB series open current transformer with model number CTSB 0508.

As a preferable scheme of the embodiment, an insulating sleeve 6 is arranged in the shell, and the insulating sleeve 6 is detachably sleeved on the male head 1 of the transformer and is used for isolating the current transformer from the grounding conductor to be tested;

the insulating sleeve 6 comprises two box bodies 7 which are oppositely arranged and are provided with openings at two ends, the rear ends of the two box bodies 7 are connected in a sealing way through a connecting plate 8, and the distance between the two box bodies 7 is matched with the thickness of the first channel 3; the front end of box body 7 is equipped with connecting frame 9, connecting frame 9's middle part is equipped with shrouding 10, shrouding 10's width matches with the interval between two box bodies 7, shrouding 10 and the curb plate that two box bodies 7 are relative and connecting plate 8 surround and form the second passageway 11 that supplies the earthing conductor to await measuring to pass, the external contour of second passageway 11 matches with the internal contour of first passageway 3.

According to the embodiment, the insulating sleeve 6 is sleeved on the transformer male head 1, so that the grounding conductor to be tested and the current transformer can be effectively isolated, and the influence of leakage of the grounding conductor to be tested on the accuracy of a monitoring result is avoided.

As a preferred solution of this embodiment, the housing includes a left housing 12, a right housing 13 and a middle housing 14, where the left housing 12 and the right housing 13 are respectively mounted on left and right side end surfaces of the middle housing 14 by screws (in this embodiment, four corners of the end surfaces of the left housing 12 and the right housing 13 are respectively provided with mounting holes penetrating therethrough, four corners of the left and right side end surfaces of the middle housing 14 are respectively provided with corresponding blind holes), the top surface and the bottom surface of the middle housing 14 are provided with through holes 4 corresponding to the first channel 3, and the fixing bracket is mounted on the bottom surface of the middle housing 14; through design split type detachable casing, make things convenient for monitoring devices's installation and dismantlement.

In this embodiment, the side surface of the intermediate housing 14, the side surface of the insulating sleeve 6 and the side surface of the transformer male head 1 are provided with corresponding mounting holes, and the intermediate housing 14, the insulating sleeve 6 and the transformer male head 1 are fixed together by adopting screw connection through the corresponding mounting holes.

The waterproof shell is adopted in the shell in the embodiment, and sealing strips are arranged on the end faces of the two sides of the middle shell 14, so that the tightness of connection between the left shell 12 and the right shell 13 and the middle shell 14 can be improved, and the waterproof performance of the shell is further improved.

As a preferred solution of this embodiment, the current collecting board 5 is installed inside the right housing 13, and the bottom surface of the right housing 13 is provided with a waterproof connector 15 for accessing a communication cable and a power supply cable, and by setting the waterproof connector 15 on the bottom surface of the right housing 13, the waterproof performance of the housing can be further improved.

As a preferable scheme of the embodiment, a display screen 16 is arranged on the side surface of the shell, and the display screen 16 is electrically connected with the current acquisition board 5; the display screen 16 includes a nixie tube 17, a protective panel 18 (in this embodiment, a waterproof transparent acrylic glass plate is adopted) and a fixing frame 19, the protective panel 18 is sandwiched between the nixie tube 17 and the fixing frame 19, the fixing frame 19 fixes the nixie tube 17 and the protective panel 18 on the side surface of the shell through screws (in the specific implementation process, a slot hole for accommodating the nixie tube 17 is arranged on the side surface of the shell, the nixie tube 17 is embedded in the slot hole, and the protective panel 18 and the nixie tube 17 are fixed in the slot hole through the fixing frame 19); the display screen 16 is arranged on the side face of the shell, so that current monitoring data can be conveniently checked on site, and the digital tube 17 can be protected by arranging the protection panel 18 on the outer side of the digital tube 17.

As a preferred solution of this embodiment, the fixing bracket includes two opposite L-shaped fixing plates 20, the two fixing plates 20 are respectively mounted on two sides of the through hole 4 on the bottom surface of the housing, and a gap between the two fixing plates 20 is used for clamping the grounding conductor to be tested; the top surface that fixed plate 20 and casing bottom surface are connected is equipped with a plurality of waist round holes 21, adjusts the interval between two fixed plates 20 through waist round hole 21, can be suitable for the band steel of different thickness.

In the specific implementation process, the current acquisition board 5 is integrated with a current conversion module, a signal conditioning module, an analog-to-digital conversion module, a microprocessor and a data communication module which are electrically connected in sequence, the current acquisition board 5 is also integrated with a power supply module, the input end of the current conversion module is electrically connected with the output end of the current transformer, and the power supply module is electrically connected with the current conversion module, the signal conditioning module, the analog-to-digital conversion module, the microprocessor and the data communication module respectively; the current conversion module is used for reducing the current output by the current transformer according to a preset proportion and outputting the current, the signal conditioning module is used for amplifying, filtering and the like the current conversion module, and the analog-to-digital conversion module is used for converting the conditioned analog signal into a digital signal and displaying the digital signal on the nixie tube 17 after processing the digital signal by the microprocessor; the data communication module is used for sending the monitored current signals to the background server.

The monitoring device of this embodiment can monitor traction transformer iron core earth current in real time, and the current acquisition board 5 that possesses bus communication function can be with a plurality of monitoring devices networking operation, realizes the distributed simultaneous monitoring of a plurality of traction transformers in the transformer substation, and nimble network mode can freely increase and decrease according to the difference of application scene, is convenient for maintain and expand, supports that a plurality of on-the-spot monitoring devices are connected with a main website.

The installation process of the monitoring device of this embodiment is as follows:

firstly, two L-shaped fixing plates 20 are respectively fixed to preset positions on two sides of a grounding flat steel to be tested through screws, an insulating sleeve 6 is sleeved at the opening end of a transformer male head 1, the transformer male head 1 sleeved with the insulating sleeve 6 is sleeved outside the flat steel, a connecting frame 9 is sleeved at the opening end of the transformer male head 1, and then a transformer female head 2 and the transformer male head 1 are connected together in an inserting mode; the middle shell 14 is sleeved outside the current transformer, through holes 4 on the top surface and the bottom surface of the middle shell 14 correspond to the first channel 3, the middle shell 14, the insulating sleeve 6 and the transformer male head 1 are fixed together through screws, and the left shell 12 and the right shell 13 are respectively fixed to two ends of the middle shell 14 through screws; finally, the housing is fixed to the two fixing plates 20.

The working process of the monitoring device of this embodiment is as follows:

when the transformer core is grounded and the current passes through the flat steel, the current can generate induced current on the current transformer, the induced current is converted by the current conversion module, the signal conditioning module and the analog-to-digital conversion module and then is sent to the microprocessor for current collection, the data communication module is controlled to integrate and pack the data, the time mark is added, the data is sent to the background server through the communication cable, the data is stored if the communication fails, and the data is sent again after the communication is recovered.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The open-close type transformer core grounding current monitoring device is characterized by comprising an open-close type current transformer, wherein a first channel (3) for a grounding conductor to be tested to pass through is arranged in the middle of the open-close type current transformer; the outside of the open-close type current transformer is provided with a detachable shell, and the top surface and the bottom surface of the shell are provided with through holes (4) corresponding to the first channel (3); a current collection plate (5) is arranged in the shell, and the current collection plate (5) is electrically connected with the open-close type current transformer and is used for collecting the current of the grounding conductor to be tested; the bottom of the shell is provided with a fixing bracket for fixing the shell on the grounding conductor to be tested.

2. The open-close type transformer core grounding current monitoring device according to claim 1, wherein the open-close type current transformer comprises a transformer male head (1) and a transformer female head (2), and the transformer male head (1) and the transformer female head (2) are connected in an inserting mode.

3. An open-close type transformer core grounding current monitoring device as claimed in claim 2, characterized in that an insulating sleeve (6) is arranged in the shell, and the insulating sleeve (6) is detachably sleeved on the transformer male head (1) and used for isolating the current transformer from a grounding conductor to be tested.

4. A device for monitoring the grounding current of an open-close type transformer core according to claim 3, characterized in that the insulating sleeve (6) comprises two box bodies (7) which are oppositely arranged and are provided with two open ends, the rear ends of the two box bodies (7) are connected in a sealing way through a connecting plate (8), and the interval between the two box bodies (7) is matched with the thickness of the first channel (3); the front end of box body (7) is equipped with connecting frame (9), the middle part of connecting frame (9) is equipped with shrouding (10), the width of shrouding (10) matches with the interval between two box bodies (7), shrouding (10) and the curb plate that two box bodies (7) are relative and connecting plate (8) surround and form second passageway (11) that supply the earthing conductor to await measuring to pass, the external contour of second passageway (11) matches with the internal contour of first passageway (3).

5. The open-close type transformer core grounding current monitoring device according to claim 1, wherein the shell comprises a left shell (12), a right shell (13) and a middle shell (14), the left shell (12) and the right shell (13) are respectively arranged on the left side end face and the right side end face of the middle shell (14) through screws, through holes (4) corresponding to the first channel (3) are formed in the top face and the bottom face of the middle shell (14), and the fixing support is arranged on the bottom face of the middle shell (14).

6. An open-close type transformer core grounding current monitoring device according to claim 5, characterized in that the current collecting plate (5) is installed inside a right shell (13), and a waterproof connector (15) for connecting a communication cable and a power supply cable is arranged on the bottom surface of the right shell (13).

7. An open-close type transformer core grounding current monitoring device as claimed in claim 1, characterized in that a display screen (16) is arranged on the side face of the shell, and the display screen (16) is electrically connected with the current collecting plate (5).

8. The grounding current monitoring device for the open-close type transformer core according to claim 7, wherein the display screen (16) comprises a nixie tube (17), a protection panel (18) and a fixing frame (19), the protection panel (18) is clamped between the nixie tube (17) and the fixing frame (19), and the fixing frame (19) is used for fixing the nixie tube (17) and the protection panel (18) on the side face of the shell.

9. An open-close type transformer core grounding current monitoring device as claimed in claim 1, characterized in that the fixing support comprises two opposite L-shaped fixing plates (20), the two fixing plates (20) are respectively arranged at two sides of the through hole (4) in the bottom surface of the shell, and a gap between the two fixing plates (20) is used for clamping a grounding conductor to be tested.

10. The device for monitoring the grounding current of the open-close type transformer core according to claim 9, wherein a plurality of waist round holes (21) are formed in the top surface, connected with the bottom surface of the shell, of the fixing plate (20), and the distance between the two fixing plates (20) is adjusted through the waist round holes (21).