Application case of Altai DAM3000 module and wireless communication module in urban lighting monitoring system
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1. The necessity of building a lighting monitoring system
1.1 Current control methods
The street lamp monitoring system consists of an external street lamp 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 the three-remote monitoring (telemetry, remote control, remote signaling) of street lamps through the street lamp monitoring system, realize the controllability of the street lamp operation system, reduce the labor intensity of street lamp maintenance, flexibly control the switch of landscape lights in the middle of the night, and improve the operation system of street lamps. Management level, in order to adapt to the requirements of urban modernization for street lighting system, and better help the street lighting management department to fulfill its service commitment to the society.
At present, the control method is mainly based on the decentralized time control method, that is, a timer is installed in the street light distribution box, and the lights are turned on/off at a predetermined time; and some landscape light switches are usually manually controlled.
1.2 Defects of current control methods
The current method can neither adjust the time of turning on/off the light in time, nor can it reflect the operation of the lighting facility in time, and has a high failure rate and difficult maintenance. With the continuous development of the city, the scope of control is getting larger and larger, and the current control method cannot reflect the operation of the lighting facilities in time, which makes the maintenance work very passive. Faults during operation can only be found when inspectors arrive at the scene, or passively wait for calls from citizens, so it is difficult to repair them in time.
When encountering some special tasks such as inspections by leaders, reception of state guests, and large-scale events, due to the lack of flexible control methods, a large number of personnel must be temporarily dispatched to the scene to manually operate the lighting switch box or temporarily notify the landscape lighting units. Under urgent circumstances, the requirements for the successful completion of the task cannot be met.
Second, the composition of the street lamp (light) monitoring system
The specific monitoring objects of the system: the voltage, current, active power and reactive power in the lighting system control box, which can be connected with corresponding transformers to measure voltage and current signals of different ranges. The voltage and current acquisition accuracy is 0.4%. The relay switch output can directly control the contactor switch in the control cabinet of the street lamp, used for street lamp, midnight lamp, landscape lamp, advertising lamp control, with switch input channel, can be used as contactor feedback signal, gate control after setting switch etc.
2.2 System Hardware
Acquisition hardware DAM3000 series modules and GPRS1090
2.2.1 DAM3000 series
DAM-3501/T
Single-phase intelligent AC power acquisition module
·Voltage range: 10V, 250V, 400V, 500V, etc. optional
Current range: 1A, 5A, 10A, 20A, etc. optional
Accuracy: ±0.2%
·Isolation 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 A-type relay
·Contact capacity: 250VAC@1A; 30VDC@2A
· Support dual watchdog
LEDs indicate output status
DAM-3011D
8 isolated digital input modules
Input: 6 differential, 2 single-ended or 8 differential
·Input high level: 4V～30V
·Input low level: 0～1V
·Isolation voltage: 5000V
The input channel can be used as a 100Hz counter
·Built-in watchdog
LEDs indicate input status
2.2.2 GPRS1090
Transparent data transmission and protocol conversion: The module is embedded with a complete TCP/IP protocol stack, providing RS-232/485 interface, providing a transparent transmission channel for users’ data equipment;
·Support virtual data private network;
· Support multiple data centers;
Support point-to-point, point-to-multipoint, center-to-multipoint and other data transmission; support data center dynamic domain name or IP address access;
The data terminal supports three working modes: always-on, idle offline, and idle power-off;
Support SMS and call wake-up function;
·Support disconnection automatic reconnection function;
Support SMS configuration and maintenance;
·Support local and remote GUI configuration and maintenance;
·With power, connection status, running status indicator;
·With RS-232/485 interface;
·Support local and remote firmware upgrade;
·Reliable design of multiple software and hardware, watchdog technology makes the device run safely;
· DC 5V～26V wide range power supply (9V～12V recommended);
The maximum working current is 300mA, and the sleep time is less than or equal to 10mA;
·Working 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 street light control database, and automatically records the on/off time, voltage, current, lighting rate, accumulated power, power factor and other data of each segment of street lights for easy query. Provide any combination and any time period query interface to improve the management level of street light monitoring. Perfect report query, print management, monitoring software planning, friendly interface, easy to operate, easy to learn.
Three conclusions
After adopting the urban lighting automatic monitoring system, the on/off of all-night lights, midnight lights and landscape lights can be automatically controlled in the whole city. At the same time, because the lighting automation monitoring system has the functions of automatic alarm and inspection and selection, the dispatcher can know the location and status of the fault in a few seconds after the fault occurs, which provides a strong guarantee for timely repair. Street lights are maintained in a timely manner, and the wireless lighting monitoring system can improve the reliability and checkability of lights on/off, and avoid the occurrence of lighting during the day; at the same time, the system adopts a control scheme that combines light control and time control. The street lights are turned on or off according to the illuminance in the section, which can automatically extend the lighting time in cloudy and rainy days, and automatically shorten the lighting time in fine weather; these measures can not only meet the needs of the public for road lighting, but also avoid the unnecessary use of street lights Turn on, reducing the time to turn on the lights, thus saving a lot of power.
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