Street lamp safety system

Abstract

The utility model discloses a street lamp safety system, a street lamp is powered by a power supply incoming cable in a ground cable well, the street lamp safety system comprises a current trapper and a measurement protector, the current trapper comprises a conductive part which is arranged in the cable well at an interval with the power supply incoming cable when in use, and the measurement protector is connected with the current trapper. The conductive part is used for recycling the leakage current of the power supply incoming cable so as to reduce the leakage current between the power supply incoming cable and the ground and reduce the potential of the electric leakage position; the measurement protector is electrically connected with the conductive member and is used for detecting the recovery current of the conductive member and correspondingly outputting a first alarm instruction according to the detection result. When water enters the cable well, the conductive part can recycle the leakage current of the power supply incoming cable, so that the leakage current of the power supply incoming cable to the ground is reduced, street lamp power supply tripping and electric shock safety accidents are avoided, and the measurement protector is used for giving an alarm to remind a worker to handle in time.

Description

Technical Field

[0001] The present application relates to the field of electricity safety detection, and in particular to a street lamp safety system. Background Art

[0002] As a common basic circuit device in life, street lamps have power safety and reliability requirements. A cable well is usually opened near the street lamp, and the power supply cable connector of the street lamp power supply is set in the cable well.

[0003] If the power incoming cable connector is partially exposed and water enters the cable well, it may cause electric shock to people. On the other hand, if the street light power grid is equipped with a leakage protector, leakage of the power incoming cable connector of a street lamp may cause the entire line to trip, greatly reducing the reliability of the street lighting. Utility Model Content

[0004] Based on this, it is necessary to provide a street lamp safety system to address the above technical issues.

[0005] The present application provides a street lamp safety system, wherein the street lamp is powered by a power supply incoming cable in a ground cable well, and the street lamp safety system comprises:

[0006] A current catcher, the current catcher comprising a conductive member which is placed in a cable well and spaced apart from a power supply incoming cable when in use, the conductive member being used to recover leakage current of the power supply incoming cable when water enters the cable well, so as to reduce leakage current between the power supply incoming cable and the earth and lower the potential near the leakage position;

[0007] The measuring protector is electrically connected to the conductive member and is used to detect the recovery current of the conductive member and output a first alarm instruction accordingly according to the detection result.

[0008] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0009] Optionally, the measuring protector includes a first detection module for detecting the recovery current and outputting a first detection signal, and a control module for receiving the first detection signal and issuing a corresponding first alarm instruction.

[0010] Optionally, the current capturer includes an insulating support member for isolating the conductive member from the ground.

[0011] Optionally, the current capturer includes an insulating barrier that prevents the power supply incoming cable from contacting the conductive member.

[0012] Optionally, the conductive member and the insulating barrier member are both plate-shaped structures, and the insulating barrier member covers the conductive member.

[0013] Optionally, the insulating barrier is provided with a plurality of holes.

[0014] Optionally, the street lamp includes a lamp pole, the measurement protector includes a second detection module, the second detection module is used to detect the voltage of the lamp pole, and the control module is used to output a second alarm instruction according to the detection result of the second detection module.

[0015] Optionally, the leakage current between the power incoming cable and the ground is lower than 10mA, and the potential near the leakage position is lower than 12V.

[0016] Optionally, the conductive member provides zero potential.

[0017] Optionally, the street lamp safety system includes a terminal device that receives an alarm instruction from the measuring protector and performs corresponding actions.

[0018] The street light safety system of this application has at least the following technical effects:

[0019] When the cable well is not flooded, the conductive parts and the power supply cable circuit are isolated due to the spacing arrangement, which does not affect the normal use of the street lamp. When the cable well is flooded, if the power supply cable is exposed, especially at the joint, on the one hand, the conductive parts can recover the leakage current of the power supply cable, reduce the leakage current of the power supply cable to the ground, and avoid electric shock safety accidents and street lamp power tripping. On the other hand, the measuring protector can be used to alarm and remind the staff to deal with it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a wiring diagram for the use of a street light safety system in one embodiment of the present application;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the medium current catcher;

[0022] Figure 3 This is a schematic diagram of the structure of a current capture device in one embodiment of the present application;

[0023] Figure 4 for Figure 1 Schematic diagram of the module structure of the measuring protector;

[0024] Figure 5 This is a wiring diagram for the use of a street light safety system in one embodiment of the present application;

[0025] Figure 6 for Figure 4 Principle framework and wiring diagram;

[0026] The reference numerals in the figures are described as follows:

[0027] 010, lamp pole; 020, cable well; 030, power supply incoming cable; 031, power supply incoming cable connector; 100, current catcher; 110, conductive member; 120, insulating support member; 130, insulating barrier member;

[0028] 200, measuring protector; 201, control module; 202, communication module; 210, first detection module; 220, second detection module; 221, VG detection line; 222, vertical grounding electrode; 230, third detection module; 300, terminal device. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] In this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to these products or devices.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, so that the internal connection of two elements or the interaction relationship between two elements can be achieved. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] See also Figure 1 In one embodiment of the present application, a street lamp safety system is provided. The street lamp includes a lamp pole 010. The street lamp is powered by a power supply cable 030 in a cable well 020. The cable well 020 usually has a junction box and a power supply cable connector 031. When water enters the cable well 020, if the power supply cable is damaged and exposed, especially at the power supply cable connector 031, it will discharge to the ground through the water and generate leakage current. The leakage current is likely to cause electric shock safety accidents and tripping of the entire line. Because the leakage position of the leakage is usually at the power supply cable connector 031, the following description will take the leakage of the connector as an example.

[0037] The street lamp safety system in this embodiment includes a current catcher 100 and a measuring protector 200. The current catcher 100 includes a conductive member 110 placed in a cable well 020 when in use, and the conductive member 110 is used to recover the leakage current of the power supply incoming cable 030, thereby reducing the leakage current between it and the earth and the potential near the leakage position, so as to avoid the tripping of the street lamp power supply and the occurrence of electric shock safety accidents.

[0038] When in use, the conductive member 110 is disposed in the cable well and is spaced apart from the power supply cable 030. Preferably, the power supply cable connector 031 is located above the center of the conductive member 110. The measurement protector 200 is installed in the lamp pole 010.

[0039] When water enters the cable well 020, causing the power supply cable connector 031 to discharge to the ground and generate leakage current, the conductive member 110 recovers most of the leakage current, thereby reducing the cable discharge to the ground. At the same time, the measuring protector can detect the recovered current in real time and issue the first alarm instruction in time. When in use, the height difference between the conductive member 110 and the power supply cable connector 031 can be adjusted to change the size of the recovered current accordingly.

[0040] See also Figure 2 and Figure 3 The current capturer 100 includes an insulating support member 120 for isolating the conductive member 110 from the ground, and an insulating barrier member 130 for preventing the power supply cable connector 031 from making electrical contact with the conductive member 110 .

[0041] In some embodiments, the insulating support member 120 is an insulating pillar, the conductive member 110 and the insulating barrier 130 are both plate-shaped structures, and the insulating barrier 130 covers the conductive member 110. The conductive member 110 can be, for example, a stainless steel metal plate. The insulating barrier 130 has a plurality of holes, and the whole forms a porous insulating plate, for example, a porous insulating bakelite board.

[0042] Furthermore, multiple conductive members 110 can be arranged in the cable well along the plumb bob direction, and each conductive member is electrically connected to each other. Specifically, the conductive members 110 can be repeatedly arranged at different heights in the cable well so that the power supply cable connector 031 is located in the middle area of ​​two conductive members 110.

[0043] See also Figures 4 to 6 , and the following table, the measuring protector 200 includes a first detection module 210, a second detection module 220, a control module 201 and a communication module 202. The measuring protector has an N line (neutral line), an L line (live line) and a PE line connected during operation. Specifically, an LED1 is connected between the L line and the PE line, and an LED2 is connected between the N line and the PE line, both of which are used to indicate the working state of the measuring protector. A power supply module for charging and discharging is connected between the L line and the N line. The conductive member is electrically connected to the N line to provide a zero potential plane.

[0044] Serial number Terminal name Function 1 N / L / PE Measure the operating power supply of the protector. 2 485A / 485B Communication port of the measuring protector, which can communicate with the terminal device 3 PNE Connect the conductive part of the current catcher. 4 VG The VG terminal is connected to the ground terminal of the lamp pole to measure the leakage of the lamp pole.

[0045] The first detection module 210 may be, for example, a current transformer CT, and the control module may be, for example, an MCU. The first detection module 210 is connected to the conductive member 110 via the PNE terminal in the figure, so as to detect the recovery current flowing through the conductive member 110. The control module 201 is used to output a first alarm instruction accordingly according to the detection result of the first detection module 210.

[0046] In the case where the cable well 020 is not flooded, if there is leakage in the power supply cable connector 031, in the worst case, it will contact the insulating barrier 130 below, and the cable leakage point will not directly contact the ground, and of course there will be no leakage current between the cable and the earth, and the power supply line will not trip due to leakage. In addition, from the perspective of electric shock protection, since the cable well has a heavy well cover as a barrier, it complies with the provisions of GB50054-2011 "5.1 Direct Contact Protection Measures", which can prevent line leakage tripping to a certain extent.

[0047] When water enters the cable well, leakage occurs in the power incoming cable connector. The plate-like conductive part recovers the leakage current of the power incoming cable connector through the connecting line (recorded as PNE line). The plate-like conductive part 110 forms a zero potential plane as a whole. The leaking power incoming cable connector 031 forms a loop with the conductive part 110. At this time, the measuring protector can recover the leakage current to the ground of the power incoming cable connector 031, and the recovered current is used as the trigger signal of the leakage alarm, that is, the first alarm instruction is output.

[0048] On this basis, due to the zero potential effect of the conductive member 110, the potential near the power supply cable connector is reduced. Figure 1 The potential of the highest point A in the middle potential (generally at the height of the power supply cable connector) is lower than 12V. Since the potential outside the current catcher is lower than AC12V, according to Article 5.1.2 of GB50054-2011, AC voltages lower than AC25V do not require external protection, so the water outside the cable well will not cause electric shock to personnel. In addition, according to Article 7.1.2 of GB50034-2013, "Lighting fixtures installed underwater should be powered by safe extra-low voltage, and the AC voltage value should not be greater than 12V, and the ripple-free DC power supply should not be greater than 30V", it means that 12V AC voltage in water is allowed and there will be no electric shock accidents.

[0049] Since the potential of the current catcher is lower than AC12V, the leakage current of the power supply cable connector to the ground is lower than 10mA (measured), and the line will not trip due to leakage (according to the fourth edition of the "Industrial and Civil Power Supply and Distribution Design Manual", Article 11.7.3, paragraph (2), "Rated residual non-operating current (I △no ). Refers to the current value of RCD not operating under specified conditions, I △noThe standard value is 0.5I △n ”,0.5I △n =15mA, so a leakage current of 10mA will not cause the leakage protector to trip), and the entire line can still be illuminated normally.

[0050] Furthermore, the measuring protector 200 includes a communication module 202 and a terminal device 300 that is communicatively connected to the communication module 202. The communication module 202 can use 4G communication, for example, external communication through ports 485A and 485B. The terminal device 300 can be, for example, a personal computer, a laptop, a tablet computer, and a smart phone. The communication module 202 transmits the output signal (including leakage current data signal, alarm instruction, etc.) of the measuring protector to the terminal device 300. After the terminal device 300 obtains the output signal, a corresponding action is performed on the terminal device 300 to remind and notify the management personnel to eliminate the fault in time.

[0051] The measuring protector provided in this embodiment realizes the leakage alarm and the safety protection function of preventing personnel from electric shock when the cable joint leaks and water enters the cable well. It also prevents the leakage of the incoming connector of a street lamp from causing power outage of the entire line, thereby improving the reliability of line operation.

[0052] See also Figures 4 to 6 In one embodiment, voltage detection of the lamp pole 010 housing is also provided. Since the grounding resistance of some lamp poles is very large, some exceed 1000Ω, and the vertical grounding electrodes 222 of some lamp poles are even missing or completely disconnected. In these cases, when the phase line of the street lamp touches the lamp pole housing, the leakage protector of the line cannot detect the leakage current, and of course cannot issue an early warning or cut off the power supply. However, the lamp pole housing is charged at this time, and when someone touches the lamp pole, they will inevitably be electrocuted, resulting in a personal safety accident.

[0053] In view of this, in one embodiment, the measuring protector 200 includes a second detection module 220, which is used to detect the voltage of the lamp pole 010 to prevent people from getting electric shock when they touch the lamp pole 010. Specifically, the conductive part of the lamp pole housing is electrically connected to the second detection module 220 via the VG detection line 221 in the figure, and the second detection module can be a voltage transformer PT, for example. A relay K1 can be set in the connection line, and the relay K1 is controlled by the control module to control the on and off of the VG detection line 221. The control module 201 is used to control the output of the second alarm instruction according to the detection result of the second detection module 220.

[0054] In this embodiment, the second detection module 220 provides the function of measuring and alarming the leakage voltage of the lamp pole 010. When the grounding of the lamp pole 010 is seriously poor, or even the grounding device is detached or the vertical grounding electrode is not installed directly, in this case, when the phase line is connected to the lamp pole shell, the leakage protection device cannot detect the leakage current or the leakage current is extremely small (for example, less than 30mA / 100mA, etc.) and cannot cut off the line. However, the lamp pole shell still has a high pre-contact voltage that is even directly equal to the phase voltage. In this case, this embodiment connects the VG detection line to the measuring protector on the lamp pole. When the measuring protector detects that the lamp pole has a leakage voltage (exceeding a certain limit), the control module sends a second alarm instruction to the management personnel to timely troubleshoot the fault and prevent accidental personal injury.

[0055] The street lamp safety system provided in each embodiment of the present application can perform comprehensive measurement and protection of street lamp electricity safety and improve the reliability of street lamp operation. It includes: (1) leakage detection and alarm of the measuring protector when water enters the cable well, and the current is recovered by the current capturer, which can effectively prevent line tripping and electric shock to personnel. (2) Leakage voltage measurement and alarm of the lamp pole. (3) The measuring protector has a remote function, and data is exchanged with the server through the 4G module. The real-time and historical data of each street lamp can be viewed on a mobile phone or computer terminal.

[0056] In one embodiment, a street lamp safety protection method is provided. The street lamp is powered by a power supply incoming cable in a ground cable well. The street lamp safety protection method includes: setting a conductive member spaced apart from the incoming cable in the cable well, and when water enters the cable well, using the conductive member to recover the leakage current of the power supply incoming cable to reduce the leakage current between the power supply incoming cable and the ground and reduce the potential near the leakage position. Furthermore, it also includes detecting the leakage current and issuing an alarm to the operator accordingly.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0058] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A street lamp safety system, wherein the street lamp is powered by a power supply cable in a ground cable well, characterized in that: The street light safety system comprises: A current catcher, the current catcher comprising a conductive member which is placed in a cable well and spaced apart from a power supply incoming cable when in use, the conductive member being used to recover leakage current of the power supply incoming cable when water enters the cable well, so as to reduce leakage current between the power supply incoming cable and the earth and lower the potential near the leakage position; A measuring protector is electrically connected to the conductive member and is used to detect the recovery current of the conductive member and output a first alarm instruction accordingly according to the detection result.

2. The street light safety system according to claim 1, characterized in that: The measuring protector comprises a first detection module for detecting the recovery current and outputting a first detection signal, and a control module for receiving the first detection signal and issuing a corresponding first alarm instruction.

3. The street light safety system according to claim 1, characterized in that: The current trap includes an insulating support member for isolating the conductive member from the ground.

4. The street light safety system according to claim 1, characterized in that: The current catcher includes an insulating barrier for preventing the power supply cable from contacting the conductive member.

5. The street lamp safety system according to claim 4, characterized in that: The conductive member and the insulating barrier member are both plate-shaped structures, and the insulating barrier member covers the conductive member.

6. The street light safety system according to claim 4, characterized in that: The insulating barrier is provided with a plurality of holes.

7. The street lamp safety system according to claim 2, characterized in that: The street lamp comprises a lamp pole, the measuring protector comprises a second detection module, the second detection module is used to detect the voltage of the lamp pole, and the control module is used to output a second alarm instruction according to the detection result of the second detection module.

8. The street light safety system according to claim 1, characterized in that: The leakage current between the power supply incoming cable and the ground is lower than 10mA, and the potential near the leakage position is lower than 12V.

9. The street lamp safety system according to claim 1, characterized in that: The conductive member provides a zero potential.

10. The street light safety system according to claim 1, characterized in that: The street lamp safety system includes a terminal device for receiving an alarm instruction from the measuring protector and performing corresponding actions.

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