CN214045022U

CN214045022U - Safe type lightning protection device

Info

Publication number: CN214045022U
Application number: CN202022046790.0U
Authority: CN
Inventors: 郭丰明
Original assignee: Shenzhen Keanda Rail Transit Technology Co ltd; Shenzhen Keanda Electronic Technology Co ltd
Current assignee: Shenzhen Keanda Rail Transit Technology Co ltd; Shenzhen Keanda Electronic Technology Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-08-24
Anticipated expiration: 2030-09-17

Abstract

The utility model belongs to the technical field of the circuit cable, a safe type lightning protection device is related to, include: the safety lightning protector comprises a lightning protection assembly and an electric separation unit which are connected in series, wherein the lightning protection assembly is provided with a trip, the electric separation unit comprises a current detection subunit for detecting the floor drain current and an automatic cut-off subunit connected with the current detection subunit, and the automatic cut-off subunit cuts off the ground wire of the safety lightning protector when the floor drain current exceeds a threshold value. The third rail phenomenon can be effectively avoided, and the possibility of short circuit caused by the fault of the lightning protection device is eliminated. The reliability of the lightning protection device is improved.

Description

Safe type lightning protection device

Technical Field

The utility model relates to a safe type lightning protection device belongs to circuit cable technical field.

Background

The third rail phenomenon is that another loop is formed when the resistance of the track bed is very small through other conductors beside the steel rail, namely, a loop exists outside the double-rail transmission channel, and the loops can communicate with each other, so that the receiving loop receives a signal of the transmitting loop due to the third rail and judges that the vehicle is not available. At present, the longitudinal protection of the ZPW2000 track circuit does not use a lightning protector because the lightning protector for longitudinal protection can cause a signal to cause a third rail phenomenon; just because the lightning protection device is not used for leakage to the ground longitudinally, the lightning protection of the ZPW2000 track circuit does not reach the ideal effect.

Disclosure of Invention

To the above problem, the utility model aims at providing a safe type lightning protection device, it can effectually avoid the third rail phenomenon, arouses the possibility of short circuit when eliminating the lightning protection device trouble. The reliability of the lightning protection device is improved.

In order to achieve the purpose, the utility model adopts the following technical proposal: a secure lightning protection device, comprising: the safety lightning arrester comprises a lightning protection assembly and an electric separation unit which are connected in series, wherein the lightning protection assembly is provided with a trip, the electric separation unit comprises a current detection subunit for detecting the floor drain current and an automatic cut-off subunit connected with the current detection subunit, and the automatic cut-off subunit cuts off the ground wire of the safety lightning arrester when the floor drain current exceeds a threshold value.

Further, the current detection subunit comprises a leakage current sensor, an amplifying circuit and a comparison and judgment circuit; the leakage current sensor is connected with the amplifying circuit, the amplifying circuit is connected with the comparison judging circuit, and the comparison judging circuit is used for judging whether the current exceeds a threshold value.

Further, the electric separation unit also comprises a control subunit, and the current detection subunit is connected with the automatic cutting subunit through the control subunit.

Furthermore, the automatic cut-off subunit comprises a driving circuit and a normally closed switch, wherein the driving circuit is connected with the control subunit and the normally closed switch and controls the normally closed switch to be opened and closed according to the instruction of the control subunit.

Further, the normally closed switch is an electric knife switch.

Furthermore, safe type lightning protection device still includes the lightning protection subassembly, and the lightning protection subassembly includes piezo-resistor and gas discharge tube, and piezo-resistor and gas discharge tube are established ties, are provided with the dropout on the piezo-resistor, and the dropout makes piezo-resistor break away from the circuit when the piezo-resistor state is unusual.

Further, the tripping comprises thermal tripping and/or impact tripping, and the thermal tripping enables the piezoresistor to be separated from the circuit when the temperature of the piezoresistor is greater than a threshold value; the surge trip disengages the piezoresistor from the circuit when the surge current of the piezoresistor is greater than a threshold.

Furthermore, the piezoresistor, the gas discharge tube and the release are connected in series, one electrode of the piezoresistor is connected with one end of the release, and the other end of the gas discharge tube, which is connected with the release, is fixed on a fixed wall.

Furthermore, the gas discharge tube is connected with the fixed wall through an elastic piece.

Further, the lightning protection subassembly is at least two, and electronic the unit setting that breaks away from is between two lightning protection subassemblies.

The utility model discloses owing to take above technical scheme, it has following advantage: the safety type lightning protection device greatly improves the safety and the reliability due to the adoption of the safety type electric separation device, thoroughly eliminates the possibility of short circuit caused by the fault of the lightning protection device, meets the fault safety requirement, and is suitable for longitudinal lightning protection of railway signal equipment with higher safety requirements such as ZPW-2000 and the like.

Drawings

Fig. 1 is a schematic view of the safety lightning protection device of the present invention.

Detailed Description

The present invention is described in detail by way of specific embodiments in order to enable those skilled in the art to better understand the technical direction of the present invention. It should be understood, however, that the detailed description is provided for a better understanding of the invention only and that they should not be taken as limiting the invention. In describing the present invention, it is to be understood that the terminology used is for the purpose of description only and is not intended to be interpreted as indicating or implying any relative importance.

Example one

The embodiment discloses a safety lightning protection device, as shown in fig. 1, the safety lightning protection device includes a lightning protection component and an electric separation unit connected in series, the lightning protection component is provided with a trip, the electric separation unit includes a current detection subunit for detecting a floor drain current and an automatic cut-off subunit connected with the current detection subunit, and the automatic cut-off subunit cuts off a ground wire of the safety lightning protection device when the floor drain current exceeds a threshold value.

The electric separation unit comprises a current detection subunit, an automatic cutting subunit and a control subunit, wherein the current detection subunit comprises a leakage current sensor, an amplifying circuit and a comparison and judgment circuit; the leakage current sensor is connected with the amplifying circuit, the amplifying circuit is connected with the comparison judging circuit, and the comparison judging circuit is used for judging whether the current exceeds a threshold value. The electric separation unit also comprises a control subunit, and the current detection subunit is connected with the automatic cutting subunit through the control subunit. The automatic cut-off subunit comprises a driving circuit and a normally closed switch, wherein the driving circuit is connected with the control subunit and the normally closed switch and controls the normally closed switch to be opened and closed according to the instruction of the control subunit. The normally closed switch is an electric knife switch.

The ground connection of the lightning protection device connects the leakage current sensor with the upper end of the automatic cut-off subunit, the lower end of the automatic cut-off subunit is grounded, and the control subunit is respectively connected with the leakage current sensor and the automatic cut-off subunit to control the on-off of the circuit of the lightning protection device. When the floor drain current of the lightning protection unit reaches a preset value and continuously reaches preset time, the control subunit judges that the lightning protection unit is abnormal, the automatic cut-off subunit is immediately started, the ground wire of the lightning protector is cut off, safety is ensured, when the lightning current or the interference circuit passes through the lightning protection unit, the duration is short, the preset time is not reached, the starting condition of the automatic cut-off subunit cannot be reached, the lightning current or the interference current can be released to a ground grid through the automatic cut-off subunit, and at the moment, the control subunit can record the lightning stroke times. The control subunit adopts a safety circuit, and when power failure and fault occur, the automatic cut-off subunit automatically cuts off the electric wire of the lightning protection device, so that fault safety is realized. The automatic cutout subunit includes at least one electrically powered blade.

The safety lightning protection device further comprises a lightning protection assembly, the lightning protection assembly comprises a piezoresistor and a gas discharge tube, the piezoresistor and the gas discharge tube are connected in series, the piezoresistor is provided with a release, and the release enables the piezoresistor to be separated from a circuit when the state of the piezoresistor is abnormal. The lightning protection subassembly is at least two, and electronic unit setting that breaks away from is between two lightning protection subassemblies.

The tripping comprises thermal tripping and/or impact tripping, and the thermal tripping enables the piezoresistor to be separated from the circuit when the temperature of the piezoresistor is greater than a threshold value; the surge trip disengages the piezoresistor from the circuit when the surge current of the piezoresistor is greater than a threshold. The voltage dependent resistor, the gas discharge tube and the release are connected in series, one electrode of the voltage dependent resistor is connected with one end of the release, and the other end of the gas discharge tube connected with the release is fixed on a fixed wall. The gas discharge tube is connected with the fixed wall through an elastic piece.

The lightning protection device is also provided with a communication unit. The communication unit comprises a plurality of communication interfaces, can technically transmit the working condition of the lightning protection device to an upper computer, realizes real-time monitoring, can give an alarm in time if a fault exists, and is convenient and quick to maintain.

The safety type lightning protection device greatly improves the safety and the reliability due to the adoption of the safety type electric separation device, thoroughly eliminates the possibility of short circuit caused by the fault of the lightning protection device, meets the fault safety requirement, and is suitable for longitudinal lightning protection of railway signal equipment with higher safety requirements such as ZPW-2000 and the like.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention. The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a safe type lightning protection device which characterized in that includes: the safety lightning protector comprises a lightning protection assembly and an electric separation unit which are connected in series, wherein the lightning protection assembly is provided with a trip, the electric separation unit comprises a current detection subunit for detecting the floor drain current and an automatic cut-off subunit connected with the current detection subunit, and the automatic cut-off subunit cuts off the ground wire of the safety lightning protector when the floor drain current exceeds a threshold value.

2. The safety lightning protector according to claim 1, characterized in that the current detection subunit comprises a leakage current sensor, an amplifying circuit and a comparison and judgment circuit; the leakage current sensor is connected with the amplifying circuit, the amplifying circuit is connected with the comparison and judgment circuit, and the comparison and judgment circuit is used for judging whether the current exceeds a threshold value.

3. The safe lightning protection device according to claim 2, wherein the electrical disconnect unit further comprises a control subunit, and the current detection subunit is connected to the automatic cut-off subunit through the control subunit.

4. The safety lightning protection device according to claim 3, wherein the automatic cut-off subunit comprises a driving circuit and a normally closed switch, the driving circuit is connected with the control subunit and the normally closed switch, and controls the normally closed switch to be opened or closed according to the instruction of the control subunit.

5. The safety lightning protection device according to claim 4, wherein the normally closed switch is an electric knife switch.

6. The safety lightning protection device according to any one of claims 1 to 5, further comprising a lightning protection component, wherein the lightning protection component comprises a piezoresistor and a gas discharge tube, the piezoresistor and the gas discharge tube are connected in series, and a release is arranged on the piezoresistor, and when the piezoresistor is in an abnormal state, the release enables the piezoresistor to be separated from a circuit.

7. The safety lightning protection device of claim 6, wherein the trip comprises a thermal trip and/or a shock trip, the thermal trip taking the varistor out of circuit when the temperature of the varistor is greater than a threshold value; and the surge trip enables the piezoresistor to be separated from the circuit when the surge current of the piezoresistor is greater than a threshold value.

8. The safety lightning arrester of claim 7 wherein the varistor, the gas tube and the trip are connected in series, one electrode of the varistor is connected to one end of the trip, and the other end of the gas tube connected to the trip is fixed to a fixed wall.

9. The safety lightning protection device according to claim 8, wherein the gas discharge tube is connected to the fixed wall by an elastic member.

10. The safety lightning protection device according to claim 6, wherein the number of the lightning protection components is at least two, and the electrically powered disconnecting unit is arranged between the two lightning protection components.