Urban lighting monitoring system
First, the necessity of building a lighting monitoring system
1.1 Current Control Methods
The street light monitoring system consists of an external street light control terminal (DAM3000 module), a wireless data communication system (GPRS1090), and a monitoring center. It is a comprehensive remote monitoring system integrating automatic control technology, wireless data communication technology, and database technology. Its purpose is to realize three-way monitoring of streetlights (telemetry, remote control, and remote signaling) through the streetlight monitoring system, to achieve controllability of the streetlight operation system, to reduce the labor intensity of maintenance of the streetlights, and to control the on/off of the flexible midnight lamp landscape lights, and to improve the operation system of the streetlights. The management level is to adapt to the requirements of the modernization of the street lighting system and to help the street lamp management department to fulfill its commitment to the community.
Nowadays, the control method is mainly based on the decentralized time control mode. That is, a timer is installed in the street light distribution box, and the lights are turned on/off by a predetermined time. Some landscape light switches are usually manual manual control methods.
1.2 Defects of current control methods
The current method can neither timely adjust the time of turning on/off the light, nor can it timely reflect the operation of the lighting facility, and has a high failure rate and difficult maintenance. With the continuous development of the city, the control range is getting larger and larger, and the current control methods cannot timely reflect the operation of the lighting facilities, making the maintenance work very passive. Failures during the operation can only be discovered when the patrolling personnel arrive at the site, or passively wait for the public's telephone to respond, so it is difficult to perform timely maintenance.
In the face of some special tasks such as leadership inspections, guest reception, and large-scale events, due to the lack of flexible control measures, a large number of people must be temporarily dispatched to the scene to manually operate the lighting switch box or temporarily notify the landscape light units. In urgent circumstances, the requirements for successful completion of the task cannot be met.
Second, the street lamp (light) monitoring system composition
The specific monitoring object of the system: the lighting system controls the voltage, current, active power, and reactive power in the box and can be connected to the corresponding transformer to measure voltage and current signals of different ranges. Accuracy of voltage and current acquisition is 0.4%. The relay switch output can directly control the contactor switch in the drive street light control cabinet. It is used for control of street lights, midnight lights, landscape lights and advertising lights. It has switch input channels and can be set as contactor feedback signals and gates. Switch and so on.
2.2 System Hardware
Acquisition hardware DAM3000 series module and GPRS1090
2.2.1DAM3000 Series
DAM-3501/T
Single-phase intelligent AC power measurement module · Voltage range: 10V, 250V, 400V, 500V, etc. · Current range: 1A, 5A, 10A, 20A, etc. · Accuracy: ±0.2%
Isolated voltage: 3000VDC
· Built-in watchdog · External current transformer · Onboard temperature and humidity sensor (optional)
DAM-3018D
8 way relay output module relay output: 8 way type A relay contact capacity: 250VAC@1A; 30VDC@2A
Support dual watchdog LED indication output status
DAM-3011D
8-channel isolated digital input module • Input: 6-channel differential, 2-channel single-ended or 8-channel differential • Input high: 4V to 30V
·Input low level:0～1V
Isolated voltage: 5000V
Input channel can be used as a 100Hz counter Built-in watchdog LED indication input status
2.2.2 GPRS1090
Transparent data transmission and protocol conversion: The module integrates a complete TCP/IP protocol stack, provides RS-232/485 interfaces, and provides transparent transmission channels for users' data devices;
Support virtual data private network;
Support multiple data centers;
Supports point-to-point, point-to-multipoint, and center-to-multipoint data transmission; supports data center dynamic domain name or IP address access;
The data terminal supports three working modes: always online, idle offline, and idle power-off;
Support SMS and call wake-up functions;
Supports automatic disconnection of broken lines;
Support SMS configuration and maintenance;
Supports local and remote graphical interface configuration and maintenance
· With power, connection status, operating status indicator;
· With RS-232/485 interface;
Supports local and remote firmware upgrades
Multiple reliable design of hardware and software, watchdog technology to ensure safe operation of equipment;
DC 5V ~ 26V wide range of power supply (9V ~ 12V recommended);
·Maximum operating current 300mA, ≤10mA during sleep;
Operating temperature: -30 °C ~ +70 °C;
·Working humidity: 90%
2.3 System Software
The monitoring center software is based on the Internet architecture, supports remote access, establishes a streetlight control database, and automatically records the on/off time, voltage, current, lighting ratio, accumulated power, and power factor of each section of streetlights, facilitating the query. Provide any combination of query interfaces at any time period to improve the management of street lamp monitoring. Perfect report query, printing management, monitoring software planning, friendly interface, easy operation, easy to learn.
Three conclusions
With the use of the city lighting automation monitoring system, the citywide night lights, midnight lights and landscape lights can be turned on/off automatically. At the same time, since the lighting automation monitoring system has the function of automatic alarm, inspection and selection, the dispatcher can understand the location and status of the fault in seconds immediately after the fault occurs, providing a powerful guarantee for timely repair. The street lamp is maintained in time, and the wireless lighting monitoring system can improve the reliability and checkability of the on/off lamp to avoid the occurrence of daytime lighting conditions. At the same time, the system adopts a combination of light control and time control in a preset time. In the section, the illumination is determined according to the degree of illumination. The illumination time can be automatically extended on rainy days, and the lighting time can be automatically shortened on sunny days. These measures can satisfy the public's need for road lighting and avoid the needlessness of street lights. Turn on, reducing the turn-on time, which saves a lot of power.