Street lamp cable insulation state intelligent detection and early warning device and method

Abstract

The invention discloses a street lamp cable insulation state intelligent detection and early warning device and method, and relates to the technical field of power monitoring. The device comprises a detection module used for detecting the ground insulation resistance value and the interphase insulation resistance value of a cable in a power-off state of the cable; the power supply module comprises a rechargeable battery and a charging management circuit, and the charging management circuit is used for automatically stopping charging when the battery is fully charged; and the fault indication module comprises a plurality of LED indication lamps and is used for indicating the fault type of the cable. Efficient operation and maintenance are achieved through an automatic detection mechanism, a detection program can be automatically triggered in the night power-off period of the street lamp, manual intervention is not needed in the whole process, and the detection efficiency is remarkably improved; according to the fault positioning technology, through color combination coding of the LED indicating lamps, single-phase ground short circuit and interphase short circuit faults can be rapidly and accurately distinguished, and the troubleshooting and maintenance time is effectively shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of power monitoring. Specifically, it relates to an intelligent detection and early warning device and method for the insulation state of street lamp cables. Background Art

[0002] With the intelligent development of urban lighting systems, the real-time monitoring and accurate fault diagnosis of the insulation state of street lamp cables have become key requirements for ensuring power supply safety and operation and maintenance efficiency. Existing technologies rely on manual periodic inspections and single-point measurements, suffering from problems such as low efficiency, poor real-time performance, and fuzzy fault location. Specifically:

[0003] 1. Inefficiency and lack of real-time performance in manual inspections

[0004] Traditional solutions rely on manual inspections point by point with tools such as megohmmeters. Data needs to be manually recorded and analyzed offline, and 24-hour online monitoring cannot be achieved, resulting in delayed fault discovery, prone to safety hazards such as electric leakage and short circuits. Moreover, the labor cost is high and the inspection period is long (such as monthly / quarterly inspections), making it difficult to cope with sudden insulation deterioration risks.

[0005] 2. Limitations of power-off inspections and insufficient scenario adaptation

[0006] Traditional inspections require the cable to be completely powered off, and the "natural power-off window" during the intermittent power-off of street lamps at night (such as the power-off period in the early morning) cannot be used to automatically trigger inspections. As a result, the inspection frequency is limited by power supply scheduling, and frequent power-offs affect the continuity of lighting services.

[0007] 3. Weak fault diagnosis ability

[0008] Single-point measurements can only determine whether the insulation resistance is lower than the threshold, unable to distinguish complex fault types such as single-phase grounding, phase-to-phase short circuit, and multi-point grounding, and it is also difficult to locate the fault phase (such as phase A / B / C) and the specific section, resulting in repeated troubleshooting by maintenance personnel and a long repair cycle.

[0009] In view of this, the present invention is specifically proposed. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an intelligent detection and early warning device and method for the insulation state of street lamp cables, solving the problems raised in the above background art.

[0011] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0012] An intelligent detection and early warning device for the insulation state of street lamp cables, comprising:

[0013] A detection module for detecting the insulation resistance between the cable and the ground and the insulation resistance between phases in the power-off state of the cable;

[0014] A power module, which includes a rechargeable battery and a charging management circuit. The charging management circuit is used to automatically stop charging when the battery is full;

[0015] A fault indication module, which includes multiple LED indicators and is used to indicate the types of cable faults. Among them:

[0016] The yellow, green, red, and blue lights respectively correspond to the faults where the resistance between the A, B, C, and N phases and the ground is lower than 1 megohm;

[0017] When any two indicator lights light up simultaneously, it corresponds to a short - circuit fault where the resistance between two - phase cables is lower than 1 megohm;

[0018] A control module, which is used to start the detection module 1 minute after the street - lamp power supply is cut off, detect in a loop 5 times. If a fault is detected, it keeps the fault indicator light on constantly until the fault indication is cleared after the street - lamp is re - powered on.

[0019] Optionally, the detection module is connected to a three - phase five - wire cable, which includes A, B, C, N, and PE. The detection module is used to detect the insulation resistance between the A, B, C, and N phases and between each phase and the PE wire respectively.

[0020] Optionally, the charging management circuit of the power module charges the battery through the cable power supply when the street - lamp is operating. The charging indicator light (green flashing) is used to indicate the charging status.

[0021] Optionally, the fault indication module further includes:

[0022] A red operation indicator light, which is used to indicate the live state of the cable;

[0023] A green detection indicator light, which is used to indicate the normal working state of the battery.

[0024] Optionally, it further includes a protection module integrating an independent circuit. The protection module includes an over - voltage protection circuit and a current - limiting circuit.

[0025] Optionally, the detection module includes a voltage - generating circuit with a DC 250V voltage. The voltage - generating circuit realizes voltage output through a resistor voltage - dividing network, where the output voltage satisfies the formula:

[0026] VCC_HV=(1 + R3 / R4)×1.23

[0027] where R3 and R4 are voltage - dividing resistors.

[0028] An intelligent detection and early - warning method for the insulation state of street - lamp cables includes the following steps:

[0029] S1. After the street - lamp power supply is cut off, the control module counts down for 1 minute and triggers the detection module to start;

[0030] S2. The detection module outputs a DC voltage of 250V and measures the phase-to-phase resistance and ground resistance of the three-phase five-wire cable in sequence.

[0031] S3. If any phase-to-phase resistance or ground resistance is lower than 1 megohm, the control module drives the corresponding fault indicator light to turn on.

[0032] S4. Detect 5 times in a loop. If a fault is continuously detected, keep the fault indicator light on constantly.

[0033] S5. When the street lamp is re-energized, the control module clears the fault indication and enters the standby charging mode.

[0034] 8. A method for intelligent detection and early warning of the insulation state of a street lamp cable according to claim 7, characterized in that, in step S2, the phase-to-phase resistance detection includes measuring the resistance between phases A-B, A-C, A-N, B-C, B-N, and C-N.

[0035] Optionally, the indication logic of the fault indicator light in step S3 is: a single-color light on corresponds to a single-phase ground fault, and two-color lights on simultaneously correspond to a two-phase short-circuit fault.

[0036] Optionally, when the street lamp is running, the battery is charged through the cable power supply. The charging management circuit determines whether it is fully charged by detecting the battery voltage and automatically cuts off the charging circuit.

[0037] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all the following advantages at the same time:

[0038] The present invention realizes efficient operation and maintenance through an automated detection mechanism, can automatically trigger the detection program during the night power-off period of the street lamp, and does not require manual intervention throughout the process, significantly improving the detection efficiency; its fault location technology can quickly and accurately distinguish single-phase ground short-circuit and phase-to-phase short-circuit faults through the color combination coding of the LED indicator lights, effectively shortening the fault troubleshooting and repair time; the integrated protection module built into the system can monitor the wiring status in real time, avoid equipment damage caused by wiring errors, and ensure the safety and reliability of the detection process; in addition, the low-power design fully adapts to the application scenario of the periodic power-off of the street lamp, realizes an optimal balance between energy-saving requirements and functional stability, and fully meets the actual needs of intelligent street lamp detection.

[0039] The following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. Description of the Drawings

[0040] The following drawings in the description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts. In the drawings:

[0041] Figure 1 It is a flowchart of an intelligent detection and early warning method;

[0042] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0043] Now, the present invention will be further described in detail with reference to the accompanying drawings.

[0044] Please refer to Figure 1 As shown, in this embodiment, an intelligent detection and early warning device for the insulation state of street lamp cables is provided, including:

[0045] A detection module, configured to detect the insulation resistance between the cable and the ground and the insulation resistance between phases when the cable is powered off; among them, the insulation detection module is configured to measure the insulation resistance between the cable and the ground and the insulation resistance between phases A, B, C, and N through a DC 250V voltage when the cable is powered off, and the detection threshold is set to 1 megohm. Among them, the detection module is connected to a three-phase five-wire cable, and the three-phase five-wire cable includes A, B, C, N, and PE. The detection module is used to detect the insulation resistance between phases A, B, C, and N and between each phase and the PE line;

[0046] A power module, the power module includes a rechargeable battery and a charging management circuit, and the charging management circuit is used to automatically stop charging when the battery is full; among them, the charging management circuit includes a rechargeable lithium battery and a charge and discharge control circuit, which supports automatic charging when the street lamp is running and stops charging after being full, and the endurance is ≥7 days; among them, the charging management circuit of the power module charges the battery through the cable power supply when the street lamp is running, and the charging indicator (green flashing) is used to indicate the charging status;

[0047] A fault indication module, the fault indication module includes a plurality of LED indicators, used to indicate the cable fault type, among which:

[0048] The yellow, green, red, and blue lights respectively correspond to the faults where the insulation resistances of phases A, B, C, and N to the ground are lower than 1 megohm; among them, the yellow, green, red, and blue four-color LEDs respectively correspond to the insulation faults of phases A, B, C, and N, and support the linkage indication of multi-phase combined faults;

[0049] When any two indicator lights light up simultaneously, it corresponds to a short-circuit fault where the resistance between two-phase cables is lower than 1 megohm; when the insulation resistance of phase A to the ground <1 megohm, the yellow light lights up; the faults of phases B, C, and N respectively trigger the green, red, and blue lights; when the resistance between phases AB <1 megohm, the yellow and green lights light up synchronously, and the same applies to other inter-phase faults;

[0050] The fault indication module further includes:

[0051] A red operating indicator light is used to indicate the live state of the cable.

[0052] A green detection indicator light is used to indicate the normal working state of the battery.

[0053] A control module is used to start the detection module 1 minute after the street lamp power supply is cut off, and detect 5 times in a loop. If a fault is detected, the fault indicator light will be kept on and the fault state will be locked until the street lamp is re-energized to clear the fault indication. Among them, the fault code is stored non-volatile, and the fault record is retained after power-off. After the power supply is restored, the fault state will be automatically cleared and switched to the charging mode.

[0054] The present invention realizes efficient operation and maintenance through an automatic detection mechanism, can automatically trigger the detection program during the night power-off period of the street lamp, and the whole process does not require manual intervention, significantly improving the detection efficiency. Its fault location technology can quickly and accurately distinguish single-phase-to-ground short-circuit and phase-to-phase short-circuit faults through the color combination coding of LED indicator lights, effectively shortening the fault troubleshooting and repair time. The built-in integrated protection module of the system can monitor the wiring status in real time, avoid equipment damage caused by wiring errors, and ensure the safety and reliability of the detection process. In addition, the low-power design fully adapts to the application scenario of periodic power-off of street lamps, realizes an optimal balance between energy-saving requirements and functional stability, and comprehensively meets the actual needs of intelligent street lamp detection.

[0055] This embodiment also includes a protection module integrating an independent circuit, and the protection module includes an overvoltage protection circuit and a current limiting circuit.

[0056] The detection module of this embodiment includes a generating circuit for a DC 250V voltage, and the voltage generating circuit realizes voltage output through a resistor voltage dividing network, where the output voltage satisfies the formula:

[0057] VCC_HV = (1 + R3 / R4) × 1.23

[0058] Wherein, R3 and R4 are voltage dividing resistors.

[0059] An intelligent detection and early warning method for the insulation state of a street lamp cable includes the following steps:

[0060] S1. When the street lamp power supply is cut off, the control module counts down for 1 minute and triggers the start of the detection module.

[0061] S2. The detection module outputs a DC 250V voltage and sequentially measures the phase-to-phase resistance and the resistance to ground of the three-phase five-wire cable. Among them, the phase-to-phase resistance detection includes the resistance measurement between phases A-B, A-C, A-N, B-C, B-N, and C-N.

[0062] S3. If any phase-to-phase resistance or ground resistance is lower than 1 megohm, the control module drives the corresponding fault indicator light to turn on; among them, the indication logic of the fault indicator light is: a single-color light on corresponds to a single-phase-to-ground fault, and two-color lights on simultaneously correspond to a two-phase short-circuit fault;

[0063] S4. Detect 5 times in a loop. If a fault is continuously detected, keep the fault indicator light on constantly;

[0064] S5. When the street lamp is re-energized, the control module clears the fault indication and enters the standby charging mode.

[0065] In this embodiment, the battery is charged by the cable power supply during the operation of the street lamp. The charging management circuit judges whether it is fully charged by detecting the battery voltage and automatically cuts off the charging circuit.

[0066] The LED indicator light in this embodiment has a height ≥ 15 mm and is exposed through a Φ5 mm hole reserved by the cover plate; the distance between the circuit board and the cover plate is ≥ 3 mm to avoid component connection; and the circuit board is coated with a three-proof paint, and the operating temperature range is -20°C to +70°C, touching the metal shell; among them, the operating status indicator light group includes a red cable live indicator light (always on) and a green battery health indicator light (flashing once per second).

[0067] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention. The technologies, shapes, and structures not detailedly described in the present invention are all well-known technologies.

Claims

1. An intelligent detection and early warning device for the insulation state of street lamp cables, characterized in that, Including: A detection module, used to detect the insulation resistance between the cable and the ground and the insulation resistance between phases when the cable is powered off. A power supply module, which includes a rechargeable battery and a charging management circuit. The charging management circuit is used to automatically stop charging when the battery is full. A fault indication module, which includes multiple LED indicators, used to indicate the cable fault type, where: The yellow, green, red, and blue lights respectively correspond to the faults where the resistance between phases A, B, C, and N and the ground is less than 1 megohm. When any two indicator lights light up simultaneously, it corresponds to a short-circuit fault where the resistance between two-phase cables is less than 1 megohm. A control module, used to start the detection module 1 minute after the street lamp power supply is powered off, and detect cyclically 5 times. If a fault is detected, the fault indicator light is kept on until the fault indication is cleared after the street lamp is re-powered on.

2. An intelligent detection and warning device for the insulation state of street lamp cables according to claim 1, characterized in that, The detection module is connected to a three-phase five-wire cable, which includes A, B, C, N, and PE. The detection module is used to detect the insulation resistance between phases A, B, C, and N and between each phase and the PE wire respectively.

3. An intelligent detection and early warning device for the insulation state of street lamp cables according to claim 1, characterized in that, The charging management circuit of the power supply module charges the battery through the cable power supply when the street lamp is operating. The charging indicator light (green flashing) is used to indicate the charging status.

4. An intelligent detection and early warning device for the insulation state of street lamp cables according to claim 1, characterized in that, The fault indication module also includes: A red operation indicator light, used to indicate the live state of the cable. A green detection indicator light, used to indicate the normal working state of the battery.

5. An intelligent detection and early warning device for the insulation state of street lamp cables according to claim 1, characterized in that, It also includes a protection module with an integrated independent circuit. The protection module includes an overvoltage protection circuit and a current-limiting circuit.

6. An intelligent detection and early warning device for the insulation state of street lamp cables according to claim 1, characterized in that, The detection module includes a DC 250V voltage generation circuit. The voltage generation circuit realizes voltage output through a resistor voltage division network, where the output voltage satisfies the formula: VCC_HV = (1 + R3 / R4) × 1.23 Where R3 and R4 are voltage division resistors.

7. An intelligent detection and early warning method for the insulation state of street lamp cables, characterized in that, Including the following steps: S1. When the street lamp power supply is powered off, the control module counts down for 1 minute and triggers the detection module to start. S2. The detection module outputs a DC 250V voltage and measures the resistance between phases and the resistance to the ground of the three-phase five-wire cable in sequence. S3. If any resistance between phases or the resistance to the ground is less than 1 megohm, the control module drives the corresponding fault indicator light to light up. S4. Detect cyclically 5 times. If a fault is continuously detected, the fault indicator light is kept on. S5. When the street lamp is re-powered on, the control module clears the fault indication and enters the standby charging mode.

8. An intelligent detection and early warning method for the insulation state of street lamp cables according to claim 7, characterized in that, In step S2, the detection of the resistance between phases includes the measurement of the resistance between A-B, A-C, A-N, B-C, B-N, and C-N phases.

9. An intelligent detection and warning method for the insulation state of street lamp cables according to claim 7, characterized in that, The indication logic of the fault indicator light in step S3 is: a single-color light lighting up corresponds to a single-phase-to-ground fault, and two-color lights lighting up simultaneously correspond to a two-phase short-circuit fault.

10. An intelligent detection and early warning method for the insulation state of street lamp cables according to claim 7, characterized in that, When the street lamp is operating, the battery is charged through the cable power supply. The charging management circuit judges whether it is full by detecting the battery voltage and automatically cuts off the charging circuit.

Images