CN213906301U - Power supply lightning protection box for isolating switch of railway traction power supply contact network - Google Patents
Power supply lightning protection box for isolating switch of railway traction power supply contact network Download PDFInfo
- Publication number
- CN213906301U CN213906301U CN202022462594.1U CN202022462594U CN213906301U CN 213906301 U CN213906301 U CN 213906301U CN 202022462594 U CN202022462594 U CN 202022462594U CN 213906301 U CN213906301 U CN 213906301U
- Authority
- CN
- China
- Prior art keywords
- lightning protection
- power supply
- line
- box
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a power supply lightning protection box for a railway traction power supply contact net isolating switch, which comprises a box body, wherein an input connecting terminal, a first switch, a lightning protection unit, an auxiliary circuit module and an output connecting terminal are arranged in the box body; the input connecting terminal can connect the contact net lead in series with the N line and the L line of the power supply lightning protection box; the lightning protection unit is arranged on an N line and an L line of the power supply lightning protection box, and the other end of the lightning protection unit is connected with a port of the PE line; the auxiliary circuit module can monitor the working state signal of the lightning protection unit in real time, display the working state of the lightning protection unit according to the working state signal and send an alarm signal when a fault is found; and the ports of N lines and L lines of the output wiring terminals are respectively connected in series with the N lines and the L lines of the power supply lightning protection box, and the other ends of the output wiring terminals are used for being electrically connected with the contact net isolating switch operating mechanism box and/or the RTU box. The device can on-line monitoring lightning protection operating condition, is equipped with a plurality of output binding post simultaneously, the centralized management of the power lightning protection case of being convenient for.
Description
Technical Field
The utility model relates to an electronic railway power supply technique especially relates to a power lightning protection box for railway traction power supply contact net isolator.
Background
Because the railway traction power supply contact net isolating switch operating mechanism box and the RTU box are arranged outdoors, the power supply and control lines are long, and the railway traction power supply contact net isolating switch operating mechanism box and the RTU box are easily influenced by thunder and lightning or power frequency strong current overvoltage, cause equipment damage and further possibly generate larger economic loss and even endanger train operation.
At present, although some operating mechanism boxes/RTU boxes are internally provided with lightning protection devices, transient overvoltage/overcurrent with smaller energy can be generally only dredged, and because the operating mechanism boxes/RTU boxes are arranged inside protected equipment boxes, fire is easy to happen after the operating mechanism boxes/RTU boxes are failed to cause damage to key equipment in the mechanism boxes and the RTU boxes, and the fault range is expanded.
The in-box lightning protection mode of the lightning protection device arranged in the existing operating mechanism box/RTU box is single. Firstly, the protection effect is poor, outdoor lightning current and power frequency overvoltage are invaded to cause damage to protected equipment, and the protected equipment is often influenced by failure, fire and the like in reality; secondly, the lightning protection device cannot inform maintenance in time after failure, and the working state of the lightning protection device needs to be manually inspected; the state of the lightning protection device is inconvenient to monitor, the state of the lightning protection device is only manually checked, the lightning protection device cannot be maintained and processed in time after failure, and potential safety risks exist; thirdly, the existing operating mechanism box/RTU is provided with the lightning protection devices dispersedly, so that one box can not be used for multi-distribution output, and the centralized management of the lightning protection devices is not convenient.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a railway pulls power supply contact net power lightning protection case for isolator, the electronic for isolator power lightning protection case of contact net lightning protection case will originally adorn the lightning protection device in isolator operating device case RTU incasement and separate out, set up the power lightning protection case alone, and optimize protection mode, realize vertical and horizontal full mould protection, the lightning protection device chooses for use novel big discharge lightning protection device, satisfy the lightning protection demand of outdoor equipment and cable, be provided with auxiliary circuit module and the thunderbolt counter that is used for gathering lightning protection device operating condition in the electronic for isolator power lightning protection case of contact net, can realize the on-line monitoring to lightning protection device operating condition, can the very first time notice handle the maintenance after the lightning protection device became invalid, and can take notes the thunderbolt number of times. The power supply lightning protection box for the electric disconnecting switch of the contact network is internally provided with an output wiring terminal for power distribution, can realize the power supply input of one path and the power distribution demand of at least three paths of power supply outputs, can monitor the power failure of each path of power supply output, and can simultaneously carry out lightning protection on at least three disconnecting switch operating mechanism boxes/RTU boxes through the output wiring terminal.
In order to achieve the purpose, the power supply lightning protection box for the isolating switch of the railway traction power supply contact network comprises a box body, wherein an input connecting terminal, a first switch, a lightning protection unit, an auxiliary circuit module and a plurality of output connecting terminals are arranged in the box body;
the input connecting terminal is provided with N-line, L-line and PE-line ports, the N-line and L-line ports are used for being electrically connected with the power supply contact wire, and the other end of the N-line and L-line ports is respectively connected with the N-line and the L-line of the power supply lightning protection box in series through the first switch; the lightning protection unit is arranged on an N line and an L line of the power supply lightning protection box, the other end of the lightning protection unit is directly connected with a PE line port, and the PE line port is used for grounding; the lightning protection unit is also connected with the auxiliary circuit module, and the auxiliary circuit module can monitor the working state signal of the lightning protection unit in real time, display the working state of the lightning protection unit according to the working state signal and send an alarm signal when a fault is found; the output connecting terminals are mutually connected in parallel and arranged on an N line and an L line of the power supply lightning protection box, the ports of the N line and the L line of the output connecting terminals are respectively connected in series with the N line and the L line of the power supply lightning protection box, and the other ends of the output connecting terminals are electrically connected with the contact net disconnecting switch operating mechanism box and/or the RTU box;
wherein, lightning protection unit includes: the first lightning protector is independently connected to the N line and the L line of the power supply lightning protection box in series, the second lightning protector and the third lightning protector are connected with the L line and the N line of the power supply lightning protection box respectively to form a connecting loop after being connected in series, and a connecting line between the second lightning protector and the third lightning protector is connected with a PE line port; the auxiliary circuit module is connected with the first lightning protection device, the second lightning protection device and the third lightning protection device in series through another connecting loop.
Furthermore, a lightning stroke counter is arranged inside the box body and is arranged on a connecting line of the lightning protection unit and the PE line port and used for counting the number of lightning strokes.
Furthermore, the L-line port of the output wiring terminal is also connected with an auxiliary circuit module, and the auxiliary circuit module is also used for monitoring the connection states of the output wiring terminals in real time and finding out faults to send out alarm signals.
Furthermore, the inside of box still is provided with the second switch that equals with output wiring terminal quantity, and the second switch sets up on output wiring terminal's L line port and the connecting line of the L line of power lightning protection box.
Furthermore, the auxiliary circuit module comprises a power supply, an indicating unit, a monitoring unit and a remote signaling output unit, wherein the indicating unit is arranged on the inner surface of the door of the power supply lightning protection box.
Further, the indicating unit includes the operation indicator lamp board.
Furthermore, a remote signaling output port is further arranged inside the box body, one end of the remote signaling output port is connected with the remote signaling output unit, and the other end of the remote signaling output port is used for establishing communication connection with an external monitoring platform.
Further, the bottom of the outer side of the box body is provided with a plurality of waterproof joints, and the waterproof joints are respectively connected with the input wiring terminals and the output wiring terminals.
Further, the inside of box is provided with three output terminal at least.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, has following beneficial effect:
the utility model provides a lightning protection safety risk hidden danger of existence of operating device case RTU case under prior art, realize the protector and by the separation installation of protector, improved the security of protection, utilize the utility model discloses distribution unit (output binding post) in the power lightning protection incasement has realized power input all the way, three routes power output's distribution demand at least, and a lightning protection case just can satisfy the power supply and the lightning protection demand of at least three operating device case RTU case, simultaneously through the on-line monitoring to lightning protection device operating condition, can provide daily monitoring record for follow-up lightning protection, optimizes the lightning protection management.
Drawings
Fig. 1 is a schematic diagram of a system principle structure of a power supply lightning protection box for a railway traction power supply contact network isolating switch according to the utility model;
fig. 2 is an illustration showing an example of an appearance structure of a power supply lightning protection box for a railway traction power supply contact network isolating switch, which is realized according to the utility model;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the lightning protection device comprises a first switch-1, a lightning protection unit-2, a lightning stroke counter-3, a box body-4, a second switch-5, an output wiring terminal-6, a waterproof connector-7, an input wiring terminal-8, a remote signaling output port-9, an indication unit-10, a first lightning protector-21, a second lightning protector-22 and a third lightning protector-23.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
It should be noted that the term "first/second" in the present invention is used only for distinguishing similar objects, and does not represent a specific ordering for the objects, and it should be understood that "first/second" may be interchanged with a specific order or sequence if allowed. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that embodiments of the invention described herein may be practiced in sequences other than those described or illustrated herein.
According to the utility model relates to a specific embodiment provides a power lightning protection box for railway traction power supply contact net isolator, and this power lightning protection box is used for the thunderbolt protection of contact net isolator operating device case and RTU case, and contact net isolator operating device case and RTU case are because install in the open air, and outdoor lightning current and power frequency overvoltage invasion are received easily to the power lightning protection box, cause and are damaged by protective apparatus to lead to the lightning protection device to become invalid, catch fire, and produce the influence to being protected the equipment. The utility model can inform maintenance in time after the power supply lightning protection box is out of work, and the working state of the lightning protection device is not needed to be manually checked; each power supply lightning protection box is provided with a remote signaling output port 9 which is in communication connection with an external monitoring platform, so that the power supply lightning protection boxes can be managed in a centralized manner.
As shown in fig. 1, a power supply lightning protection box for a railway traction power supply contact network isolating switch is provided, which comprises a box body 4, wherein an input wiring terminal 8, a first switch 1, a lightning protection unit 2, an auxiliary circuit module and a plurality of output wiring terminals 6 are arranged in the box body 4;
the input connecting terminal 8 is provided with an N line port, an L line port and a PE line port, the N line port and the L line port are used for being electrically connected with a power supply contact lead, and the other end of the N line port and the L line port are respectively connected in series with an N1 line and an L1 line of the power supply lightning protection box through the first switch 1; the lightning protection unit 2 is arranged on an N1 line and an L1 line of the power supply lightning protection box, the other end of the lightning protection unit is directly connected with a PE line port, and the PE line port is used for grounding; the lightning protection unit 2 is also connected with an auxiliary circuit module, and the auxiliary circuit module can monitor the working state signal of the lightning protection unit 2 in real time, display the working state of the lightning protection unit 2 according to the working state signal and send an alarm signal when a fault is found; a plurality of output connecting terminals 6 are mutually connected in parallel on an N1 line and an L1 line of the power supply lightning protection box, ports of an N2 line and an L2 line of the output connecting terminals 6 are respectively connected in series with an N1 line and an L1 line of the power supply lightning protection box, and the other ends of the output connecting terminals are electrically connected with the contact network disconnecting switch operating mechanism box and/or the RTU box;
wherein, lightning protection unit 2 includes: the lightning protection device comprises a first lightning protection device 21, a second lightning protection device 22 and a third lightning protection device 23, wherein the first lightning protection device 21 is independently connected to the line N1 and the line L1 of the power supply lightning protection box in series, the second lightning protection device 22 and the third lightning protection device 23 are connected with the line L1 and the line N1 of the power supply lightning protection box in series to form a connection loop, and a connection line between the second lightning protection device 22 and the third lightning protection device 23 is connected with a port of a PE wire; the auxiliary circuit module is connected with the first lightning protector 21, the second lightning protector 22 and the third lightning protector 23 in series through another connecting loop.
Furthermore, the first lightning protection device 21 is connected to the line N1 and the line L1 of the power lightning protection box, so that the voltage connected to the power lightning protection box can be adjusted, and the second lightning protection device 22 and the third lightning protection device 23 are connected in series and then connected to the grounding device, so that the lightning protection device can be used for high-power lightning conduction. From this, the lightning protection box for the electronic isolator of contact net separates the lightning protection device of original dress in isolator operating device case RTU incasement, sets up power lightning protection box alone to optimize protection mode, realize vertical and horizontal full mould protection, the lightning protection device chooses for use novel big discharge lightning protection device, satisfies the lightning protection demand of outdoor equipment and cable.
Furthermore, the box 4 is also internally provided with a lightning counter 3, and the lightning counter 3 is arranged on a connecting line between the lightning protection unit 2 and the PE line port and is used for counting the number of lightning strokes.
Furthermore, the lightning protection unit 2 of the power supply lightning protection box for the electric disconnecting switch of the contact network is provided with a lightning stroke counter 3 at the position connected with the grounding wire, so that the lightning stroke frequency can be recorded.
Furthermore, the L1 line port of the output connection terminal 6 is further connected to an auxiliary circuit module, and the auxiliary circuit module is further configured to monitor the connection status of the plurality of output connection terminals 6 in real time and send an alarm signal when finding a fault.
Furthermore, the auxiliary circuit module comprises a power supply, an indicating unit 10, a monitoring unit and a remote signaling output unit, wherein the indicating unit 10 is arranged on the inner surface of the door of the power supply lightning protection box. The power supply lightning protection box for the contact net electric isolating switch is also internally provided with an auxiliary circuit module, so that the working state of the lightning protection device can be monitored on line, and the lightning protection device can be informed to process and maintain the lightning protection device at the first time after the lightning protection device fails.
Furthermore, the inside of the box 4 is also provided with a second switch 5 with the same number as the output connection terminals 6, and the second switch 5 is arranged on a connection line between the L2 line port of the output connection terminals 6 and the L1 line of the power supply lightning protection box.
Further, at least three output terminals 6 are provided inside the case 4. Preferably, three output terminals 6 are provided. The output connection terminal 6 is used for connecting the disconnecting switch operating mechanism box/RTU box.
Furthermore, a power supply lightning protection box for the electric disconnecting switch of the contact network is internally provided with a power distribution unit, can realize the power distribution requirement of one path of power supply input three paths of power supply output, and can monitor each path of power supply output in a power failure mode.
In this embodiment, the indication unit 10 includes an operation indicator lamp panel.
Furthermore, the indicating unit 10 is provided with a working indicating lamp, and the working indicating lamp is used for indicating whether the power supply contact lead and the N1 line and the L1 line of the power supply lightning protection box are connected or not and whether the power supply lightning protection box is in a working state or not; when the green light is on, the power is on, and when the green light is off, the power is not on.
Furthermore, the indicating unit 10 is further provided with power output indicating lamps of the at least three output connecting terminals 6 respectively, for indicating the power output state of the output connecting terminals 6; when the green light is turned on, the normal output current is indicated, and when the red light is turned off, the current output is abnormal.
Furthermore, the indication units 10 are also respectively provided with lightning protection indication lamps, and the lightning protection indication lamps are used for indicating the working state of the lightning protection unit 2; wherein, when green light is bright, it indicates that lightning protection unit 2 normally works, and the red light goes out to indicate that lightning protection unit 2 works unusually.
Furthermore, the indication units 10 are respectively provided with buzzers for indicating whether there is an abnormality in the online monitoring process, such as an abnormality in the total power output of the power lightning protection box, an abnormality in the power output of the output connection terminal 6, a failure in the lightning protection unit 2, and the like.
Furthermore, a remote signaling output port 9 is further arranged inside the box body 4, one end of the remote signaling output port 9 is connected with the remote signaling output unit, and the other end of the remote signaling output port 9 is used for establishing communication connection with an external monitoring platform.
Further, box 4 outside bottom is equipped with a plurality of water joint 7, and a plurality of water joint 7 are connected with input binding post 8 and a plurality of output binding post 6 respectively.
The power supply lightning protection box is of a box body type structure, the box body is made of stainless steel, the positions of wire inlet and outlet are protected by waterproof joints, all functional components of the power supply lightning protection box are installed on an installation plate, and wires are arranged below the installation plate; the lightning protection unit 2 (including the first lightning protector 21, the second lightning protector 22 and the third lightning protector 23) is connected in parallel on the power input and power output line, when the voltage on the power line is in the normal operating condition, the lightning protector with large flux is in the high resistance off-state, when the lightning surge happens, the lightning protector is switched into the low resistance on-state fast, the surge current is discharged through the grounding line, the voltage value on the output line is limited at a lower level, and the protected object is protected. The utility model discloses a power lightning protection box still has the function to monitoring lightning protection device running state, when the lightning protection device is in failure state, can send alarm information, in time remind maintainer to carry out the maintenance of lightning protection box, guarantee equipment safety.
Through the utility model discloses the lightning protection effect of operating device case RTU case can be effectual promoted in the installation implementation of product, reduces because the lightning current is to the destruction that operating device case RTU case probably caused, because in addition with the lightning protection device with by protector device separately install, effectual solved because other potential safety hazards that the lightning protection device became invalid and lead to.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A power supply lightning protection box for a railway traction power supply contact network isolating switch is characterized by comprising a box body (4), wherein an input wiring terminal (8), a first switch (1), a lightning protection unit (2), an auxiliary circuit module and a plurality of output wiring terminals (6) are arranged in the box body (4);
the input wiring terminal (8) is provided with an N line port, an L line port and a PE line port, the N line port and the L line port are used for being electrically connected with a power supply contact wire, and the other end of the N line port and the L line port are respectively connected with an N1 line and an L1 line of the power supply lightning protection box in series through a first switch (1); the lightning protection unit (2) is arranged on an N1 line and an L1 line of the power supply lightning protection box, the other end of the lightning protection unit is directly connected with the PE line port, and the PE line port is used for grounding; the lightning protection unit (2) is also connected with the auxiliary circuit module, and the auxiliary circuit module can monitor the working state signal of the lightning protection unit (2) in real time, display the working state of the lightning protection unit (2) according to the working state signal and send an alarm signal when a fault is found; the output connecting terminals (6) are mutually connected in parallel on an N1 line and an L1 line of the power supply lightning protection box, ports of an N2 line and an L2 line of the output connecting terminals (6) are respectively connected in series with an N1 line and an L1 line of the power supply lightning protection box, and the other ends of the output connecting terminals are electrically connected with the contact network disconnecting switch operating mechanism box and/or the RTU box;
wherein the lightning protection unit (2) comprises: the lightning protection device comprises a first lightning protection device (21), a second lightning protection device (22) and a third lightning protection device (23), wherein the first lightning protection device (21) is independently connected to a line N1 and a line L1 of the power supply lightning protection box in series, the second lightning protection device (22) and the third lightning protection device (23) are connected with a line L1 and a line N1 of the power supply lightning protection box in series to form a connection loop, and a connection line between the second lightning protection device (22) and the third lightning protection device (23) is connected with a port of the PE wire; the auxiliary circuit module is connected with the first lightning protector (21), the second lightning protector (22) and the third lightning protector (23) in series through another connecting loop.
2. The power supply lightning protection box for the isolating switch of the railway traction power supply contact network according to claim 1, characterized in that a lightning counter (3) is further arranged inside the box body (4), and the lightning counter (3) is arranged on a connecting line between the lightning protection unit (2) and a PE line port and used for counting the number of lightning strokes.
3. The power supply lightning protection box for the isolating switch of the railway traction power supply contact network according to claim 1, wherein the line port of the output connection terminal (6) L1 is further connected with the auxiliary circuit module, and the auxiliary circuit module is further used for monitoring the connection state of the plurality of output connection terminals (6) in real time and sending an alarm signal when a fault is found.
4. The power supply lightning protection box for the isolating switch of the railway traction power supply contact network according to claim 1, characterized in that the interior of the box body (4) is further provided with second switches (5) with the same number as the output connection terminals (6), and the second switches (5) are arranged on a connection line of an L2 line port of the output connection terminals (6) and an L1 line of the power supply lightning protection box.
5. The power supply lightning protection box for the railway traction power supply contact network isolating switch as claimed in claim 1, wherein the auxiliary circuit module comprises a power supply, an indicating unit (10), a monitoring unit and a remote signaling output unit, and the indicating unit (10) is arranged on the inner surface of a box door of the power supply lightning protection box.
6. The power supply lightning protection box for the railway traction power supply contact network isolating switch as claimed in claim 5, wherein the indicating unit (10) comprises an operation indicator lamp panel.
7. The power supply lightning protection box for the isolating switch of the railway traction power supply contact network according to claim 5, characterized in that a remote signaling output port (9) is further arranged inside the box body (4), one end of the remote signaling output port (9) is connected with the remote signaling output unit, and the other end of the remote signaling output port is used for establishing communication connection with an external monitoring platform.
8. The power supply lightning protection box for the isolating switch of the railway traction power supply contact network according to claim 7, characterized in that a plurality of waterproof joints (7) are arranged at the bottom of the outer side of the box body (4), and the waterproof joints (7) are respectively connected with the input connecting terminal (8) and the output connecting terminals (6).
9. The power supply lightning protection box for the isolating switch of the railway traction power supply contact network according to claim 1, characterized in that at least three output connection terminals (6) are arranged inside the box body (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022462594.1U CN213906301U (en) | 2020-10-29 | 2020-10-29 | Power supply lightning protection box for isolating switch of railway traction power supply contact network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022462594.1U CN213906301U (en) | 2020-10-29 | 2020-10-29 | Power supply lightning protection box for isolating switch of railway traction power supply contact network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213906301U true CN213906301U (en) | 2021-08-06 |
Family
ID=77115627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022462594.1U Active CN213906301U (en) | 2020-10-29 | 2020-10-29 | Power supply lightning protection box for isolating switch of railway traction power supply contact network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213906301U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065042A (en) * | 2022-05-09 | 2022-09-16 | 中铁第四勘察设计院集团有限公司 | Lightning protection power protection box and electrical system |
-
2020
- 2020-10-29 CN CN202022462594.1U patent/CN213906301U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065042A (en) * | 2022-05-09 | 2022-09-16 | 中铁第四勘察设计院集团有限公司 | Lightning protection power protection box and electrical system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109884521A (en) | A kind of circuit-breaker switching on-off control loop template monitoring, alarming circuit | |
| CN108183462A (en) | Electrical protection device for electrical equipment and electrical equipment | |
| CN213906301U (en) | Power supply lightning protection box for isolating switch of railway traction power supply contact network | |
| US20240106208A1 (en) | High voltage overhead electric transmission line equipped with switchgear unit | |
| CN210778323U (en) | Power distribution network ring main unit anti-misconnection grounding knife switch forced locking device | |
| CN105244854B (en) | A kind of electric arc light protection method with 360 degree of omnidirectional's monitorings and NFC monitoring functions | |
| CN103915793A (en) | Signal monitoring anti-thunder distribution cabinet and implementation method | |
| CN215896976U (en) | Take time delay type power distribution module | |
| CN206076936U (en) | A kind of power circuit lightning protection circuit module and intelligent lightning protection device | |
| CN105226617A (en) | A kind of 360 degree of Omnibearing circular net electric arc light protection methods | |
| CN108279360A (en) | Singlephase earth fault circuit monitoring system | |
| CN205333768U (en) | Outage antitheft detection equipment of street lamp, lamp decoration and cable | |
| CN113791282A (en) | Power utilization safety monitoring system and building thereof | |
| CN207992363U (en) | Singlephase earth fault circuit monitoring system | |
| CN206758892U (en) | Dual power supply lightning-protection distribution box for the power supply of railway communication load | |
| CN202502939U (en) | Remote controlled intelligent high voltage vacuum circuit breaker | |
| CN217766764U (en) | Direct-current insulation descending analysis and confirmation instrument | |
| CN222559972U (en) | Street lamp safety system | |
| CN217508087U (en) | Post cable outlet inflation ring main unit for primary and secondary fusion ring net cage | |
| CN215580501U (en) | Power distribution detection system power distribution unit | |
| CN215833580U (en) | Short circuit detection device for power system | |
| CN110504756A (en) | A kind of ring network cabinet protective device control system | |
| CN220627178U (en) | 32-channel leakage electric fire monitoring device for wireless communication | |
| CN216648937U (en) | Low-voltage switchgear based on thing networking control | |
| CN104518440B (en) | The intelligent Prefabricated high-low voltage transformer substations of 10kV |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |