CN218788307U

CN218788307U - Integrated lightning arrester capable of realizing online monitoring

Info

Publication number: CN218788307U
Application number: CN202222919189.7U
Authority: CN
Inventors: 吴孝兵; 赵国栋; 吴洪青; 章皓斌; 祝振波
Original assignee: HANGZHOU SUPER ELECTRONIC TECHNOLOGY CO LTD
Current assignee: HANGZHOU SUPER ELECTRONIC TECHNOLOGY CO LTD
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-04-04
Anticipated expiration: 2032-11-01

Abstract

The application provides an integrated lightning arrester for realizing online monitoring, which comprises a lightning arrester body and a monitoring assembly positioned in the lightning arrester body, wherein the monitoring assembly comprises a metal sheet, a voltage limiter, a metal structural part, a circuit board and a sampling coil; the zinc oxide sheet group, the metal sheet, the voltage limiter and the metal structural part of the lightning arrester body are sequentially attached and connected; the circuit board is respectively electrically connected with the metal sheet and the metal structural member and is used for collecting leakage current flowing through the lightning arrester body; the sampling coil is electrically connected with the circuit board and used for collecting the lightning stroke times and transmitting the lightning stroke times to the circuit board; the circuit board transmits leakage current data and lightning stroke times outwards. The lightning arrester leakage current monitoring system can achieve autonomous monitoring of lightning arrester leakage current and autonomous statistics of lightning stroke times, collected monitoring data are sent to a remote receiving end in a wireless mode, wired transmission can be carried out, power consumption is low, and the lightning arrester leakage current monitoring system is adaptive to a self-powered working mode.

Description

Realize on-line monitoring's integral type arrester

Technical Field

The application relates to the technical field of lightning arrester monitoring, in particular to an integrated lightning arrester for realizing online monitoring.

Background

The lightning arrester is an electric appliance used for protecting various electric appliances in an electric power system from being damaged by lightning overvoltage, operation overvoltage and power frequency transient overvoltage impact. The types of arresters are mainly protection gap, valve type arresters and zinc oxide arresters. The zinc oxide lightning arrester is lightning protection equipment with excellent protection performance, light weight, pollution resistance and stable performance, and the good nonlinear volt-ampere characteristic of the zinc oxide is mainly utilized to enable the current flowing through the lightning arrester to be extremely small (microampere or milliampere) at normal working voltage; when overvoltage acts, the resistance drops sharply, and the energy of the overvoltage is released, so that the protection effect is achieved. Meanwhile, under the action of the voltage of a power grid, partial leakage current flows through the zinc oxide valve plate, the valve plate is heated by the current, so that the volt-ampere characteristic of the lightning arrester is changed, the change is a positive feedback process, and the aging of the zinc oxide valve plate is caused by a long-term effect until thermal breakdown occurs. Therefore, the method is an important index for judging the working state of the lightning arrester aiming at monitoring the leakage current data and the lightning stroke frequency of the lightning arrester.

Most of the existing arresters in the market do not have a monitoring function, an external monitoring device needs to be additionally installed in a matched mode, the monitoring device is installed independently under the condition that the arresters are installed, and the arresters are connected with the monitoring device through leads. On one hand, the installation process is complex, the monitoring device needs to be maintained independently, and the problem that the monitoring accuracy is reduced due to poor line contact can also occur.

Disclosure of Invention

The utility model provides an aim at provides a new integral type arrester, locates monitoring devices inside the arrester, realizes leaking the on-line monitoring of current data and thunderbolt number of times.

The utility model discloses a realize through following technical measure: an integrated lightning arrester for realizing online monitoring comprises a lightning arrester body and a monitoring assembly positioned in the lightning arrester body; the monitoring assembly comprises a metal sheet, a voltage limiter, a metal structural part, a circuit board and a sampling coil; the zinc oxide sheet group, the metal sheet, the voltage limiter and the metal structural part of the lightning arrester body are sequentially attached and connected; the circuit board is respectively electrically connected with the metal sheet and the metal structural member, and the leakage current is used for collecting the magnitude of the leakage current flowing through the lightning arrester body; the sampling coil is electrically connected with the circuit board and used for collecting the lightning stroke times and transmitting the lightning stroke times to the circuit board; the circuit board transmits leakage current data and lightning stroke times outwards.

Preferably, the device also comprises a T-shaped metal fixing piece which is positioned right below the metal structural part; the sampling coil is sleeved on the vertical rod of the metal fixing piece.

Preferably, the monitoring assembly further comprises an antenna, and the antenna is electrically connected with the circuit board and used for external transmission of data.

Preferably, the monitoring assembly further comprises a signal connector, the front end of the signal connector is fixedly connected with the circuit board, and the tail end of the signal connector penetrates through the shell to be communicated with the outside, so that leakage current data and lightning stroke frequency can be transmitted to the outside.

Preferably, the metal structure includes a metal plate portion and a support portion located around the metal plate portion and extending downward, the support portion forms a cavity below the metal plate portion, the circuit board is installed in the cavity, and a certain space height is reserved above and below the circuit board.

Preferably, a notch is formed in the metal flat plate, a conductive strip extends downwards from the metal sheet, and the conductive strip penetrates through the notch to be electrically connected with the circuit board.

Preferably, an insulating sleeve is sleeved on the conductive bar.

Preferably, the circuit board includes: an MCU microprocessor including a communication module; the power taking module comprises a first sampling end and a second sampling end, the first sampling end is electrically connected with the metal sheet, the second sampling end is electrically connected with the metal structural part, and the power taking module stores the acquired voltage and supplies power to the MCU microprocessor; and the input end of the current sampling unit is connected with the power taking module, and the output end of the current sampling unit is connected with the MCU microprocessor and used for collecting the magnitude of leakage current and transmitting the magnitude of the leakage current to the MCU microprocessor.

Preferably, the monitoring assembly is packaged inside the shell in a glue filling mode.

Preferably, the voltage limiter is a zinc oxide valve plate, a parallel plate capacitor or a discharge tube.

The beneficial effect of this application: the integrated lightning arrester can achieve autonomous monitoring of leakage current and autonomous statistics of lightning stroke times of the lightning arrester, collected monitoring data are sent to a remote receiving end in a wireless mode, wired transmission can also be conducted, power consumption is low, and the integrated lightning arrester is suitable for a self-powered working mode; the monitoring assembly is simple in component parts and low in manufacturing process complexity, and is easy to upgrade products and low in implementation difficulty for existing lightning arrester manufacturers.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is an external view of a lightning arrester integrated with a monitoring device according to a first embodiment;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a partial block diagram of the monitoring assembly of FIG. 2;

FIG. 4 is a view of the sheet metal of FIG. 3;

FIG. 5 is a diagram of the metal structure of FIG. 3;

FIG. 6 is a diagram of the circuit of FIG. 3;

FIG. 7 is a view showing the structure of the metal fixing member shown in FIG. 3;

FIG. 8 is a block diagram of the sampling coil of FIG. 3;

FIG. 9 is a view showing a part of the monitoring unit according to the second embodiment;

fig. 10 is an external view of a lightning arrester integrated with a monitoring device according to the second embodiment;

FIG. 11 is a schematic diagram of a third embodiment of a parallel-plate capacitor as a voltage limiter.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The utility model provides an integrated arrester that has monitoring subassembly, the appearance is as shown in figure 1, includes the arrester body and is located this internal monitoring subassembly of arrester, and the monitoring subassembly gathers the leakage current that flows through the arrester body and carries out the autonomous power supply and detect the leakage current size simultaneously, sends leakage current data to long-range receiving terminal through wireless or wired mode.

The arrester body is the same as a conventional arrester, and as shown in fig. 2 and 3, includes a housing 200, an upper cover, a zinc oxide sheet group 310, a lower cover 322, and two sets of connecting assemblies 320 (i.e., an upper connecting assembly and a lower connecting assembly) for connecting or fixing the arrester. The connecting assembly comprises a metal fixing member 321, a screw 323, a nut 324 and a gasket (not shown in the figure), wherein the metal fixing member is positioned between the zinc oxide sheet group and the upper cover/lower cover, the screw penetrates through the upper cover or the lower cover, and the nut and the gasket are used for fixedly connecting the lightning arrester with the outside. The zinc oxide sheet group is composed of a plurality of zinc oxide sheets arranged along the height direction.

The monitoring assembly is positioned between the zinc oxide sheet group and the upper cover or the lower cover or between two adjacent zinc oxide sheets of the zinc oxide sheet group, the monitoring assembly and the zinc oxide sheet group are packaged between the shell and the upper cover and the lower cover together by a glue filling process, a glue filling layer 100 is formed in the shell, and gaps between the monitoring assemblies are filled with glue and sealed.

The structure of the integrated lightning arrester with the monitoring component 350 disposed between the zinc oxide sheet set 310 and the lower cover 322 is described in this embodiment, and the product structure with the monitoring component disposed between the zinc oxide sheet set and the upper cover or between two adjacent zinc oxide sheets of the zinc oxide sheet set is similar to this embodiment.

The first embodiment is as follows:

monitoring assembly 350 includes, in order, a metal blade 351, a voltage limiter 352, a metal structural member 353, a circuit board 3544, and an antenna 356. The zinc oxide sheet group, the metal sheet, the voltage limiter and the metal structural part are sequentially attached and connected along the height direction of the lightning arrester. The voltage limiter can be a detecting zinc oxide valve plate, a parallel plate capacitor or a discharge tube, and the detecting zinc oxide valve plate is taken as an example in the embodiment for description.

The metal sheet is positioned between the zinc oxide sheet group and the zinc oxide valve sheet for detection. In the embodiment, the metal sheet is a copper sheet, and the copper sheet is soft, so that deformation is easily generated when two sides of the metal sheet are extruded by the zinc oxide sheet group and the zinc oxide valve sheet for detection, the contact area between the tail end of the zinc oxide sheet group and the upper surface of the zinc oxide valve sheet for detection is increased, gaps and bubbles possibly generated on two contact surfaces are reduced, and the whole sealing performance during glue pouring is facilitated.

The zinc oxide valve plate for detection is positioned between the metal sheet and the metal structural member. In this embodiment, the metal structure 353 includes a metal plate portion 3531 and a supporting portion 3532 located around the metal plate portion and extending downward, where the supporting portion isolates a vacant cavity between the metal plate portion and the metal fixing member for mounting the circuit board. The circuit board is arranged in the middle of the vacant cavity, two sides of the circuit board are respectively fixedly connected with the supporting parts, and a certain gap is reserved between the upper surface of the circuit board and the metal flat plate part and between the lower surface of the circuit board and the metal fixing part. The support part here can also be two separate support bars. This is so arranged because: under the current circuit level and process conditions, in order to realize the bidirectional functions of passive power supply and leakage current collection and save space, a circuit board needs to adopt a double-sided board, and electric elements are uniformly distributed on the upper surface and the lower surface of the circuit board, so that a space capable of accommodating the heights of components on two sides is needed. Of course, with the miniaturization of electrical components, the circuit integration degree is higher and higher, and the function that can be realized by a plurality of components before is replaced by a new component, and in the future, a circuit structure that can realize the same function only by a single panel may also appear, and the metal structure of the device can be adjusted adaptively according to the actual requirement, but the situation also shall be covered in the protection scope of the present application. Further, the structure of the metal structural member is not limited to the form including the metal flat plate portion and the supporting portion described in this embodiment, and other structural forms that the metal structural member can be isolated above the corresponding connecting component or the zinc oxide sheet to be suitable for mounting the circuit board should also be covered by the protection scope of this application.

The metal sheet and the metal structural member are electrically connected with the circuit board, when current flows through the zinc oxide valve plate for detection, a voltage difference is formed between the metal sheet and the metal structural member, and the circuit board collects the voltage difference and automatically supplies power after processing. As an implementation manner, as shown in fig. 4 and 5, a conductive strip 3511 is led out from the metal sheet, the conductive strip may be disposed at any position of the metal sheet, a notch is disposed at a position of the metal flat plate portion corresponding to the conductive strip, and the conductive strip passes through the notch and is electrically connected to the first sampling end of the circuit board. In this embodiment, consider the technology degree of difficulty and leakproofness requirement, set up the conducting strip and draw forth downwards in the edge of sheetmetal, the corresponding department in metal flat plate portion edge is equipped with a breach 3533, and the conducting strip passes this breach and the first sampling end electric connection of circuit board. In addition, an insulating sleeve is sleeved on the conductive strip to prevent the conductive strip from contacting with the edge of the gap of the metal flat plate part. The metal flat plate part is electrically connected with the second sampling end of the circuit board through a wire, and a gap is reserved between the lower surface of the metal flat plate part and the upper surface of the circuit board, so that wiring is convenient. As another implementation mode, the cross section of the zinc oxide valve plate for detection can be made to be slightly smaller than that of the metal sheet, and the conductive bar can be electrically connected with the first sampling end of the circuit board from the periphery of the zinc oxide valve plate for detection in a non-contact mode.

The circuit board comprises an MCU microprocessor with a communication module; the power taking module comprises a first sampling end and a second sampling end, and stores the acquired voltage and supplies power to the MCU microprocessor; and the current sampling unit is connected with the power taking module at the input end and connected with the MCU microprocessor at the output end and used for collecting leakage current and transmitting the leakage current to the MCU microprocessor. As shown in fig. 6, the circuit board is provided with a current-limiting resistor, a voltage rectifier, a power-taking energy storage and current sampling switcher, an energy storage capacitor, a current sampling resistor, an ADC collector, a voltage detector, a voltage converter, an MCU microprocessor and a communication module, wherein the power-taking module further comprises a current-limiting resistor, a voltage rectifier, a power-taking energy storage and current sampling switcher, an energy storage capacitor, a voltage detector and a voltage converter, the current sampling unit comprises a current sampling resistor and an ADC collector, the voltage detector controls the voltage converter to supply power to the MCU processor, and the MCU processor receives current data from the ADC sampler. The circuits adopt common electric elements in the existing market and can be purchased and obtained. The voltage signals from the first sampling end and the second sampling end are connected to two input ends of a voltage rectifier through a current-limiting resistor, the voltage output end of the voltage rectifier is connected with a power-taking energy storage and current sampling switcher, the power-taking energy storage and current sampling switcher supplies power to an energy storage capacitor on the one hand, when the energy storage capacitor is fully charged, the MCU microprocessor issues a current acquisition instruction to switch the power-taking energy storage and current sampling switcher to a current sampling resistor, the ADC collector acquires leakage current and transmits the leakage current to the MCU microprocessor, the MCU microprocessor processes and calculates the leakage current data and transmits the leakage current data to the communication module, and the communication module transmits the leakage current data to a remote receiving end through an antenna.

Further, the arrester integrated with the monitoring component of the present application may also be used to collect lightning strike times, the monitoring component including a sampling coil 355 for collecting voltage signals when struck by lightning.

When the monitoring assembly is located between the zinc oxide sheet group and the upper cover or the lower cover, the monitoring assembly can be connected to a circuit board through a T-shaped metal fixing piece originally existing in a general lightning arrester body, as shown in fig. 7 and 8, the metal fixing piece comprises an upper table top 3211 and a lower vertical rod 3212 which are connected up and down, a supporting portion of a metal structural part is supported on the upper table top of the metal fixing piece, a sampling coil is sleeved on the lower vertical rod of the metal fixing piece, a threading hole 3213 is reserved in the upper table top, and a lead 3551 from the sampling coil is conveniently connected to the circuit board. When the lightning arrester is struck by lightning, high voltage and large current flow through the zinc oxide sheet group, the metal sheet, the voltage limiter, the metal structural part and the metal fixing part, the sampling coil sleeved on the metal fixing part senses a voltage signal and transmits the voltage signal to the MCU, the MCU counts the times of lightning according to the voltage change and then transmits the times of lightning to the communication module, and the communication module transmits the times of lightning to the remote receiving end through the antenna. Furthermore, the lower vertical rod of the metal fixing piece is hollow, the upper part of the screw rod extends into the lower vertical rod, and the lower part of the screw rod penetrates through the lower cover and is fixedly connected with the nut outside the cover. If the arrester body of chooseing for use does not have the metal mounting originally or cancelled the metal mounting in product iteration process, can regard as part of this monitoring subassembly or reform transform the structure of metal structure spare with the metal mounting, generate and be used for the cover to establish the corresponding structure of sampling coil, this to technical staff in the art, do not have technical obstacle, realize easily, this kind of situation also covers in the protection scope of this application.

In another case, when the monitoring assembly is located between two adjacent zinc oxide sheets of the zinc oxide sheet group, the structure is similar to the previous case, the metal fixing piece can be used as a part of the monitoring assembly or the structure of the metal structural part is modified, and a corresponding structure for sleeving the sampling coil is generated. And will not be described in detail herein.

Still be equipped with temperature sensor (not shown in the figure) on the circuit board, temperature sensor is used for gathering zinc oxide piece group's temperature, and MCU microprocessor provides the power and reads the temperature value for temperature sensor, transmits temperature data to communication module again, and communication module passes through the antenna and sends temperature data to long-range receiving terminal.

As an implementation mode, the antenna is vertically arranged on one side of the metal structural part, the upper end of the antenna is fixedly connected with the circuit board and is in point connection with an antenna feeder arranged on the circuit board, the lower end of the antenna is erected on the lower cover, and the lower cover plays a role in supporting and fixing the antenna.

Example two:

the difference between the second embodiment and the first embodiment is that the first embodiment adopts wireless transmission, and the second embodiment adopts wired transmission, and does not include an antenna.

As shown in fig. 9, the circuit board is connected with a signal connector, the front end of the signal connector is fixedly connected with the circuit board, the tail end of the signal connector penetrates through the shell to be communicated with the outside, and the signal connector is electrically connected with the MCU microprocessor on the circuit board. The circuit board realizes the external transmission of data through the signal connector, and the external data acquisition terminal reads the leakage current data and the lightning stroke frequency obtained by the monitoring module through the signal connector. As shown in fig. 10, the lightning arrester integrated with the monitoring assembly using the wired transmission (through the signal connector) has an external shape similar to a general lightning conductor, except that the end of one signal connector is protruded.

Example three:

the difference between the third embodiment and the first embodiment is that the first embodiment adopts a zinc oxide valve plate as a voltage limiter for detection, and the third embodiment adopts a parallel plate capacitor as a voltage limiter. The zinc oxide valve plate is used as the voltage limiter, and the zinc oxide valve plate has the defects that the resistance value of the zinc oxide valve plate is limited, part of leakage current flows away through the zinc oxide valve plate, only part of leakage current can be converted into voltage, and power is supplied to a post-stage circuit through a power-taking circuit. Therefore, the leakage current cannot be fully utilized by the zinc oxide valve plate, and for the current and the weak and very high electricity-taking difficulty service environments, all the leakage current is used for monitoring the power supply requirement of the assembly as far as possible, so that the charging speed of the electricity storage element is increased, and the requirement for information acquisition or data processing in the lightning arrester is met.

The parallel plate capacitor is formed by sandwiching a layer of insulating medium between two closely spaced electrode plates (an upper electrode plate and a lower electrode plate respectively), wherein gas or vacuum can be used as the medium between the two electrode plates, and other insulating substances can also be used as the medium. The upper polar plate and the lower polar plate respectively comprise two layers of plate structures which are large outside and small inside and are coaxially distributed, the two layers of plate structures are provided with certain thicknesses, a supporting piece is sleeved on the periphery of the plate structures positioned on the inner sides of the two polar plates, and the upper end and the lower end of the supporting piece are respectively abutted against the inner surface of the plate structure on the outer side and used for supporting an applicable gap between the two plate structures on the inner sides. As shown in fig. 11, a cylindrical plate structure is illustrated between the upper plate 3521-2 and the lower plate 3521-3 using air as a medium. The two-layer cylinder is characterized by comprising two layers of cylinders which are large outside and small inside and are coaxially distributed up and down, wherein small cylinders of the two polar plates are arranged oppositely, a support member 3521-1 is sleeved around the small cylinders of the two polar plates, and the upper end and the lower end of the support member are respectively abutted against the inner surfaces of the two large cylinders and are used for supporting an applicable gap between the two small cylinders. The height of the gap between the small cylinders of the two polar plates of the parallel plate capacitor is less than or equal to 5mm. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. An integrated lightning arrester for realizing online monitoring comprises a lightning arrester body and is characterized by also comprising a monitoring assembly positioned in the lightning arrester body;

the monitoring assembly comprises a metal sheet, a voltage limiter, a metal structural part, a circuit board and a sampling coil; the zinc oxide sheet group, the metal sheet, the voltage limiter and the metal structural part of the lightning arrester body are sequentially attached and connected;

the circuit board is respectively electrically connected with the metal sheet and the metal structural member and is used for collecting leakage current flowing through the lightning arrester body; the sampling coil is electrically connected with the circuit board and used for collecting the lightning stroke times and transmitting the lightning stroke times to the circuit board; the circuit board transmits leakage current data and lightning stroke times outwards.

2. The integrated lightning arrester for realizing online monitoring according to claim 1, further comprising a T-shaped metal fixing member, wherein the metal fixing member is positioned right below the metal structural member; the sampling coil is sleeved on the vertical rod of the metal fixing piece.

3. The integrated lightning arrester for realizing online monitoring according to claim 1, wherein the monitoring assembly further comprises an antenna, and the antenna is electrically connected with the circuit board and used for external transmission of data.

4. The integrated lightning arrester for realizing online monitoring according to claim 1, wherein the monitoring assembly further comprises a signal connector, the front end of the signal connector is fixedly connected with the circuit board, and the tail end of the signal connector penetrates through the shell to be communicated with the outside for external transmission of leakage current data and lightning stroke times.

5. The integrated arrester of claim 1, wherein the metal structure includes a metal plate portion and a supporting portion extending downward and located around the metal plate portion, the supporting portion forms a vacant cavity under the metal plate portion, the circuit board is installed in the vacant cavity, and a certain space height is reserved above and below the circuit board.

6. The integrated lightning arrester for realizing online monitoring as claimed in claim 5, wherein the metal plate is provided with a notch, and the metal plate extends downwards to form a conductive strip, which passes through the notch and is electrically connected with the circuit board.

7. The integrated lightning arrester for realizing online monitoring according to claim 6, characterized in that an insulating sleeve is sleeved on the conductive bar.

8. The integrated lightning arrester for realizing online monitoring according to any one of claims 1 to 7, wherein the circuit board comprises:

an MCU microprocessor including a communication module;

the power taking module comprises a first sampling end and a second sampling end, the first sampling end is electrically connected with the metal sheet, the second sampling end is electrically connected with the metal structural part, and the power taking module stores the acquired voltage and supplies power to the MCU microprocessor; and the number of the first and second groups,

the input end is connected with the electricity taking module, and the output end is connected with the MCU microprocessor and used for collecting leakage current and transmitting the leakage current to the current sampling unit of the MCU microprocessor.

9. The integrated lightning arrester for realizing online monitoring according to claim 8, wherein the monitoring component is encapsulated inside the shell in a glue-pouring manner.

10. The integrated arrester of claim 8 wherein the voltage limiter is a zinc oxide plate or a parallel plate capacitor or a discharge tube.