Intelligent monitoring system and method for urban lighting cable

Abstract

The invention relates to the technical field of urban lighting cable power grid operation and maintenance monitoring, and particularly discloses an intelligent monitoring system and method for an urban lighting cable, which is used for monitoring the working state of a lighting cable circuit in real time and comprises a data acquisition unit, a regional gateway, a control center and an edge computing node which are in communication connection with one another, the maintenance terminal is used for displaying the state of the cable; the main cable and the lamp pole branch cable are adopted for simultaneous monitoring, the power supply condition of the urban illumination main cable and the working state of each lamp pole can be considered at the same time, global control is achieved, no monitoring blind area exists, and meanwhile compared with an intelligent power grid scheme that each bulb is provided with a communication module, the number of monitored data units and the background calculation amount are reduced. And the energy consumption is obviously reduced, and the later operation and maintenance economic benefits are good.

Description

Technical Field

[0001] The present invention relates to the technical fields of urban lighting and detection / monitoring of intelligent lighting, in particular to the technical field of detection of the operating state of urban lighting circuit pipe networks, and specifically relates to an intelligent monitoring system and method for urban lighting cables. Background Art

[0002] Urban lighting is one of the important guarantee factors for urban traffic and a necessary condition for pedestrians and vehicles to pass at night, and it plays a very important role in the normal operation of the city. The existing operation mode of urban lighting generally sets the closing and opening times according to the sunrise and sunset times in different seasons of the local area to realize the normal working mechanism of the lighting system; however, there are also some urban lighting schemes in relatively remote areas that adopt manual control, that is, special personnel are responsible for controlling the street lighting in small areas. Since the electrical appliances for urban lighting are mainly bulbs and distribution boxes, and the bulbs can be divided into sodium lamps, LEDs, etc. according to types, although the bulbs used in urban lighting are basically of long service life, due to the huge quantity base, and the equipment is exposed outdoors for a long time, based on external human factors, environmental factors and equipment own faults, the probability of individual or small-area faults is also relatively large.

[0003] The working state and fault troubleshooting of the existing urban lighting circuits can generally be summarized into two types: one is the traditional manual inspection. Through the full-process inspection by full-time personnel at fixed times every day, the fault points are queried and recorded, and then the troubleshooting personnel are arranged for repair and troubleshooting to achieve the state of ensuring the normal operation of the lighting circuit. This manual inspection method is a relatively old-fashioned processing method, and its disadvantages are obvious, mainly reflected in the large investment in labor costs, low efficiency, obvious lag, and long troubleshooting cycle. The other is to synchronously install an intelligent power grid when building the lighting cable system to monitor the status with labels for the entire power grid and even each bulb. However, the construction cost investment and subsequent operation and maintenance investment of this intelligent power grid are very high. Each lighting unit is equipped with a low-power communication module. In the case of a bulb damage, it is necessary to connect the entire bulb and communication module assembly for overall replacement. Although the ordinary bulb can provide lighting and has a lower cost after replacement, it does not have the status monitoring function. Therefore, in the later operation and maintenance process, the cost investment for customizing bulbs with communication modules is very huge. In addition, the status monitoring of the existing power grid cannot be compatible, and the upgrade transformation of the in-service power grid cannot be realized. Summary of the Invention

[0004] In order to solve the problems existing in the operation status monitoring of existing urban lighting cables by traditional manual inspection methods, such as high labor cost input, low efficiency, obvious lag, and long fault elimination cycle, and the problems of huge construction and later operation and maintenance costs in the intelligent power grid construction plan, resulting in inability to be widely promoted and the compatibility problem of unable to realize the upgrade and transformation of the in-service lighting cable power grid, this application provides an intelligent monitoring system and method for urban lighting cables, which is significantly lower than the construction and operation and maintenance costs of the intelligent lighting power grid in terms of cost input. At the same time, it can effectively solve the upgrade and transformation of the existing urban in-service lighting cable power grid, and the timeliness of intelligent detection of lighting cables is much higher than that of traditional manual inspection methods, with the characteristics of strong monitoring timeliness, high processing efficiency, and low subsequent operation and maintenance costs.

[0005] In order to achieve the above object, the technical solution adopted in this application is as follows: An intelligent monitoring system for urban lighting cables, which is used to monitor the working state of the lighting cable circuit in real time, includes a data acquisition unit, a regional gateway, a control center, an edge computing node, a cloud server and a maintenance terminal for displaying the cable state, which are communicatively connected to each other; the data acquisition unit includes A current monitoring unit, including a main cable monitoring unit and a lamp post cable monitoring unit. The main cable monitoring unit includes a plurality of first Hall sensors respectively installed at the outgoing end of the distribution box and arranged at the middle joints of the main cable at intervals of 150m - 200m; the lamp post cable monitoring unit includes a plurality of second Hall sensors installed at the junction box of the lamp post foundation or the power input end of the lamp. A voltage monitoring unit, which is installed in the distribution box to detect and record the cable voltage amplitude and voltage dip waveform at the output end of the distribution box. A temperature sensing unit, an optical fiber temperature sensor laid along the main cable trench / pipe and closely attached to the surface of the main cable. The optical fiber temperature sensor includes a plurality of discrete temperature measurement points arranged at intervals of 0.8m - 1m. An impedance detection unit, which is arranged at the beginning and end of the unit or regional main cable, and is used to collect the cable impedance spectrum of the main cable in the frequency range of 1 - 100kHz. A temperature and humidity detection unit, which is installed at the top of the street lamp post to detect the temperature and humidity of the lamp post environment.

[0006] Preferably, the first Hall sensor adopts a LEM - HAS 200 - S closed - loop Hall sensor, and the first Hall sensor is powered in parallel by a CT power - taking module and a super capacitor; the second Hall sensor adopts an Allegro - ACS712ELCTR - 05B - T open - loop Hall sensor and is powered in parallel by a lithium battery and a solar cell module.

[0007] Preferably, the voltage monitoring unit includes a signal conditioning module composed of a voltage divider with a voltage division ratio of 100:1 and a fourth-order Butterworth low-pass filter with a cut-off frequency of 2 kHz, a 24-bit, 8-channel synchronous sampling ADC module based on Δ-Σ, and a processing module cooperating with an ADI-ADE7880 core chip. The current input terminal of the core chip is connected to the secondary side of the CT. The input terminals of the voltage divider are respectively connected to the main cables on the output side of the distribution box and output detection electrical signals respectively.

[0008] Preferably, the temperature sensing unit includes a serpentine laying along the main cable trench / pipeline with a bending radius > 60 mm, a contact pressure with the cable surface > 5 N / m, stainless steel fixing clips uniformly installed at a spacing of 2 m along the axial direction of the main cable, and a polyurethane composite coating for anti-corrosion on the surface of the optical fiber.

[0009] Preferably, the impedance detection unit is composed of a signal source, a power amplifier, a coupling transformer, a current sensor, and a phase detection circuit. The programmable sweep frequency range of the signal source is 1 Hz - 100 kHz, and the coupling transformer is a high-frequency transformer with a turns ratio of 1:50 and a frequency response of 10 Hz - 200 kHz.

[0010] Preferably, it further includes intelligent circuit breakers discretely installed at the cable input end of the lamp post and the output end of the distribution box. The intelligent circuit breaker includes a CT power supply module, a super capacitor supporting at least 3 tripping operations, a tripping drive circuit module, a communication gateway communicatively connected to the control center, and an execution module for tripping.

[0011] The present invention also provides an intelligent monitoring method for urban lighting cables, which is implemented based on the above monitoring system and specifically includes the following steps: Step STP100, establish a line map of the detected urban lighting cables. The line map includes the distribution positions and working states of any electrical appliances and data acquisition units on the cables for display on the maintenance terminal. Step STP200, initialize the monitoring data. Initialize the data acquisition units through the control center and collect data according to the acquisition mode preset by the system. View the status visibility of the current data acquisition units through the maintenance terminal. Step STP300, perform cable monitoring. The current and voltage monitoring units collect data once every 10 seconds. When the actual value exceeds the preset value by 10%, immediately switch to high-frequency sampling at 100 ms until an alarm is triggered or the value returns to the preset range and then terminate the high-frequency sampling; the temperature sensing unit generates a temperature curve every 30 seconds; the impedance detection unit scans regularly once a day and triggers the immediate scan mode when any abnormality occurs in the system. Step STP400, data preprocessing: The edge computing node preprocesses the initial information collected by the data acquisition unit in step STP300, compares it with the corresponding threshold, and sends the comparison result to the control center; Step STP500, fault handling: The control center converts the fault data sent by the edge computing node into an execution instruction and sends it to the intelligent circuit breaker in the corresponding area to cut off the power supply of the fault area. At the same time, it judges the fault type through the fault data and displays it through the maintenance terminal; The fault type judgment process includes: .

[0012] Beneficial effects: 1. The present invention monitors both the main cable and the lamp post branch cable, which can take into account the power supply situation of the urban lighting main cable and the working status of each lamp post at the same time, achieving global control without monitoring blind spots. At the same time, compared with the smart grid solution where each bulb is equipped with a communication module, the number of monitored data units, the background computing volume, and the energy consumption are all significantly reduced, and the economic benefits of later operation and maintenance are good.

[0013] 2. The present invention can quickly locate the fault type and location of the fault point according to the current, voltage and position relationship. The maintenance personnel can prepare the maintenance tools and materials corresponding to the fault type in advance according to the fault type displayed on the maintenance terminal and go to the fault point for troubleshooting, so that fault discovery, fault alarm, fault analysis and fault exclusion can all be carried out efficiently, solving the problems of many round trips and low troubleshooting efficiency existing in the traditional inspection method.

[0014] 3. The data acquisition unit used for actual current and voltage acquisition in the present invention can adaptively select the combined power supply of CT power taking and supercapacitor or the combined power supply of lithium battery and solar cell module according to the installation position, which can realize repeated cyclic charge and discharge, effectively extend the maintenance-free life of the data acquisition unit, and reduce the system overhead and operation and maintenance costs. Description of the drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0016] Figure 1 It is a schematic block diagram of the data flow transfer of the system of the present invention.

[0017] Figure 2 It is a schematic diagram of the system framework of the present invention. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0020] Example 1: This embodiment provides an intelligent monitoring system for urban lighting cables. Figure 1 - Figure 2 As shown, it is used to monitor the working status of the lighting cable circuit in real time, including a data acquisition unit, a regional gateway, a control center, an edge computing node, a cloud server and a maintenance terminal for displaying the cable status; the data acquisition unit includes The current monitoring unit includes a trunk cable monitoring unit and a lamp pole cable monitoring unit. The trunk cable monitoring unit includes multiple first Hall sensors installed at the outlet end of the distribution box and at the middle joint of the trunk cable at intervals of 150m-200m; the lamp pole cable monitoring unit includes multiple second Hall sensors installed at the lamp pole base junction box or the lamp power input end; the first Hall sensor adopts the LEM-HAS 200-S closed-loop Hall sensor, and the first Hall sensor is powered in parallel with the supercapacitor through the CT power module; when the municipal power grid is in the power supply state, the CT power module generates an induced current and outputs ±12VDC to power the first Hall sensor. At this time, the supercapacitor is used as an energy storage element to store energy. When the CT power module has no current, the discharge of the supercapacitor is used as the power supply to achieve complementarity and ensure that the first Hall sensor is always in normal working condition. In this embodiment, the specific parameters of the first Hall sensor are shown in Table 1 below: Table 1 is a table of operating parameters of the first Hall sensor in this embodiment. During actual installation, the phase line of the cable to be detected passes through the magnetic core of the first Hall sensor, which outputs a 4-20mA current during operation and sends it to the built-in RTU acquisition module to collect the current information of the cable.

[0021] The second Hall sensor uses an Allegro-ACS712ELCTR-05B-T open-loop Hall sensor and is powered by the parallel connection of a lithium battery and a solar cell module. During daily operation, the lithium battery is used as the power source. Under the condition of illumination, the solar cell charges the lithium battery to ensure the normal operation of the second Hall sensor. The working parameters of the second Hall sensor are shown in Table 2 below: Table 2 is the working parameters of the second Hall sensor The installation positions of the first Hall sensor and the second Hall sensor, and the different currents of the monitored objects play a very important role in the working parameters and stability of the entire system. The above models integrated in this embodiment can fully meet the upgrade and transformation of the existing in-service lighting cable power grid, can realize the upgrade of the existing municipal lighting cable circuit, and solve the lighting monitoring problem of large-area circuit pipe networks. For details, see Table 3 below: Table 3 is the comparative analysis table of the main technical parameters of the first and second Hall sensors When the second Hall sensor in this embodiment is installed, the lamp post / light fixture power cord passes through the PCB opening, and the ACS712E chip is used to convert the induced current into DC and send it to the controller MCU to complete the current signal acquisition.

[0022] The voltage monitoring unit is installed in the distribution box and is used to detect and record the cable voltage amplitude and voltage drop waveform at the output end of the distribution box; specifically, the voltage monitoring unit includes a signal conditioning module composed of a voltage divider with a voltage division ratio of 100:1 and a 4th-order Butterworth low-pass filter with a cut-off frequency of 2 kHz, a 24-bit, 8-channel synchronous sampling ADC module based on Δ-Σ, and a processing module with an ADI-ADE7880 core chip. The current input end of the core chip is connected to the secondary side of the CT, and the input ends of the voltage dividers are respectively connected to the main cables on the output side of the distribution box and output detection electrical signals respectively. The communication interface uses an isolated RS-485.

[0023] The temperature sensing unit is an optical fiber temperature sensor laid along the main cable trench / pipe and closely attached to the surface of the main cable. The optical fiber temperature sensor includes a plurality of discrete temperature measurement points arranged at 0.8 m - 1 m intervals; in this embodiment, the temperature sensing unit includes a serpentine laying along the main cable trench / pipe with a bending radius > 60 mm, a contact pressure with the cable surface > 5 N / m, and stainless steel fixing clips uniformly installed at 2 m intervals along the axial direction of the main cable. The surface of the optical fiber has a polyurethane composite coating for anti-corrosion.

[0024] An impedance detection unit is arranged at the beginning and end of the main cable of a unit or area, and is used to collect the cable impedance spectrum of the main cable in the frequency range of 1 - 100 kHz; the impedance detection unit consists of a signal source, a power amplifier, a coupling transformer, a current sensor and a phase detection circuit. The programmable frequency sweep range of the signal source is 1 Hz - 100 kHz, and the turns ratio of the coupling transformer is 1:50, which is a high-frequency transformer with a frequency response of 10 Hz - 200 kHz.

[0025] A temperature and humidity detection unit is installed at the top of the street lamp pole to detect the temperature and humidity of the pole environment.

[0026] In this embodiment, it also includes intelligent circuit breakers discretely installed at the cable input end of the lamp pole and the output end of the distribution box. The intelligent circuit breaker includes a CT power-taking module, a super capacitor supporting at least 3 opening operations, a tripping drive circuit module, a communication gateway communicatively connected to the control center, and an execution module for tripping. Refer to Figure 1 As shown, there are a current monitoring unit, a voltage monitoring unit installed on the main cable and the lamp pole branch circuit, a temperature detection unit always closely attached to the main cable, and an impedance detection unit arranged at both ends of the main cable. When the control center receives the fault feature data reported after being processed by the edge computing node from the data collected by any of the above units, it is processed by the control center and the fault type and fault location coordinates are sent to the maintenance terminal for display and at the same time, warning information including visual and auditory alarms is sent out to prompt the maintenance personnel to handle it; at the same time, the intelligent circuit breaker in the corresponding area is remotely controlled to disconnect the faulty circuit to avoid causing circuit fault accidents. Compared with manual inspection, the monitoring system provided by this embodiment is more efficient and timely, and will not cause serious power accidents due to personnel processing delays. At the same time, for the entire system, except for processing devices such as edge computing nodes, control centers, and maintenance terminals and the background, other large data collection units all adopt self-powered methods, which are simple and convenient to install and have a long service life; at the same time, when installing, system labels are attached to the components of each data collection unit and associated with the labels of the intelligent circuit breaker in the corresponding area, so that timeliness and accuracy can be achieved when remotely disconnecting the faulty circuit. At the same time, the control center uploads the monitoring and fault data to the cloud server in real time or at regular intervals, which is convenient for real-time access and viewing through the client. At the same time, the stored big data can also be used for fault and life diagnosis and prediction of other lighting cable power grids, and potential power fault problems can be prevented in advance, further improving the operation reliability of urban lighting cables.

[0027] Embodiment 2: This embodiment provides an intelligent monitoring method for urban lighting cables, which is implemented based on the above monitoring system and specifically includes the following steps: Step STP100: Establish a circuit map of the city lighting cables to be detected. The circuit map includes the distribution positions and operating states of any electrical appliances and data acquisition units on the cables for display on the maintenance terminal. Step STP200: Initialize the monitoring data. Initialize the data acquisition units through the control center and collect data according to the preset acquisition mode of the system. View the status visibility of the current data acquisition units through the maintenance terminal. Step STP300: Perform cable monitoring. The current and voltage monitoring units collect data every 10 seconds. When the actual value exceeds the preset value by 10%, immediately switch to high-frequency sampling at 100 ms until an alarm is triggered or the value returns to the preset range, then terminate the high-frequency sampling. The temperature sensing unit generates a temperature curve every 30 seconds. The impedance detection unit performs a timed scan once a day and triggers the immediate scan mode when any abnormality occurs in the system. Step STP400: Data preprocessing. The edge computing node preprocesses the initial information collected by the data acquisition units in Step STP300 and compares the results with the corresponding thresholds, and sends the comparison results to the control center. Step STP500: Fault handling. The control center converts the fault data sent by the edge computing node into execution instructions and sends them to the intelligent circuit breakers in the corresponding areas to cut off the power supply in the fault area. At the same time, judge the fault type based on the fault data and display it through the maintenance terminal. The fault type judgment process includes: 。

[0028] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An intelligent monitoring system for urban lighting cables, which is used to monitor the working status of lighting cable circuits in real time, is characterized in that, It includes a data acquisition unit, a regional gateway, a control center, an edge computing node, a cloud server, and a maintenance terminal for displaying the cable status, which are communicatively connected to each other; the data acquisition unit includes a current monitoring unit, including a main cable monitoring unit and a lamp post cable monitoring unit. The main cable monitoring unit includes a plurality of first Hall sensors respectively installed at the outgoing end of the distribution box and arranged at intervals of 150m - 200m at the intermediate joints of the main cable; the lamp post cable monitoring unit includes a plurality of second Hall sensors installed at the junction box of the lamp post foundation or the power input end of the lamp. a voltage monitoring unit, installed in the distribution box for detecting and recording the cable voltage amplitude and voltage sag waveform at the output end of the distribution box. a temperature sensing unit, an optical fiber temperature sensor laid along the main cable trench / pipe and closely attached to the surface of the main cable, and the optical fiber temperature sensor includes a plurality of discrete temperature measurement points arranged at intervals of 0.8m - 1m. an impedance detection unit, arranged at the beginning and end of the unit or regional main cable, for collecting the cable impedance spectrum of the main cable in the frequency range of 1 - 100kHz. a temperature and humidity detection unit, installed at the top of the street lamp post for detecting the temperature and humidity of the lamp post environment.

2. The intelligent monitoring system for urban lighting cables according to claim 1, wherein: The first Hall sensor adopts a LEM - HAS 200 - S closed - loop Hall sensor, and the first Hall sensor is powered in parallel with a super capacitor through a CT power - taking module; the second Hall sensor adopts an Allegro - ACS712ELCTR - 05B - T open - loop Hall sensor and is powered in parallel by a lithium battery and a solar cell module.

3. The intelligent monitoring system for urban lighting cables according to claim 1, wherein: The voltage monitoring unit includes a signal conditioning module composed of a voltage divider with a voltage division ratio of 100:1 and a 4 - order Butterworth low - pass filter with a cut - off frequency of 2kHz, a 24 - bit, 8 - channel synchronous sampling ADC module based on Δ - Σ, and a processing module cooperating with an ADI - ADE7880 core chip. The current input end of the core chip is connected to the secondary side of the CT, and the input ends of the voltage divider are respectively connected to the main cables on the output side of the distribution box and respectively output detection electrical signals.

4. The intelligent monitoring system for urban lighting cables according to claim 1, characterized in that: The temperature sensing unit includes being laid in a serpentine shape along the main cable trench / pipe with a bending radius > 60mm, a contact pressure with the cable surface > 5N / m, stainless steel fixing clips evenly installed at intervals of 2m along the axial direction of the main cable, and the surface of the optical fiber has a polyurethane composite coating for anti - corrosion.

5. The intelligent monitoring system for urban lighting cables according to claim 1, wherein: The impedance detection unit is composed of a signal source, a power amplifier, a coupling transformer, a current sensor, and a phase detection circuit. The programmable sweep frequency range of the signal source is 1Hz - 100kHz, and the coupling transformer has a turns ratio of 1:50 and is a high - frequency transformer with a frequency response of 10Hz - 200kHz.

6. The intelligent monitoring system for urban lighting cables according to claim 1, characterized in that: It also includes intelligent circuit breakers discretely installed at the input end of the lamp post cable and the output end of the distribution box. The intelligent circuit breaker includes a CT power - taking module, a super capacitor supporting at least 3 opening operations, a tripping drive circuit module, a communication gateway communicatively connected to the control center, and an execution module for tripping.

7. An intelligent monitoring method for urban lighting cables, characterized in that: Implemented based on the monitoring system according to any one of claims 1 - 6, specifically including the following steps: Step STP100: Establish a line map of the city lighting cables to be detected. The line map includes the distribution positions and working states of any electrical appliances and data acquisition units on the cables for display on the maintenance terminal. Step STP200: Initialize the monitoring data. Initialize the data acquisition units through the control center and perform acquisition according to the system - preset acquisition mode. Check the status visibility of the current data acquisition units through the maintenance terminal. Step STP300: Execute cable monitoring. The current and voltage monitoring units collect data every 10 seconds. When the actual value exceeds the preset value by 10%, immediately switch to high - frequency sampling at 100 ms until an alarm is triggered or the value returns to the preset range, and then terminate the high - frequency sampling. The temperature sensing unit generates a temperature curve every 30 seconds. The impedance detection unit scans regularly once a day and triggers the immediate scan mode when any abnormality occurs in the system. Step STP400: Data pre - processing. The edge computing node pre - processes the initial information collected by the data acquisition unit in Step STP300 and compares it with the corresponding thresholds, and sends the comparison results to the control center. Step STP500: Fault handling. The control center converts the fault data sent by the edge computing node into execution instructions and sends them to the intelligent circuit breakers in the corresponding areas to cut off the power supply of the fault area. At the same time, judge the fault type through the fault data and display it through the maintenance terminal. The fault type judgment process includes: 。

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