The Beijing Hope Valley Kindergarten in Beijing’s Pinggu District is a professional, knowledgeable and high-quality teaching staff. As a demonstration park for health care in the whole district, it has received many observation activities in sister parks.
2. System Requirements AnalysisDetection of leakage current, over-current, over-temperature and other signals, sound and light signal alarm, accurately report the fault line address, monitor the changes in the point of failure. Store various fault and operation test signals to show system power status.
3. Reference standardsIn recent years, in order to increase the intensity of prevention and control of electrical fires, the state has successively formulated or revised a number of relevant standards and regulations to strengthen the prevention of electrical fires. There are:
3.1. GB 50016-2014 "Building Design Fire Protection Code"
3.2. GB 50054-2011 "Low Voltage Distribution Design Code"
3.3. JGJ 16-2008 "Civil Building Electrical Design Code"
3.4. GB 13955-2005 "Installation and operation of residual current protection devices"
3.5. GB 50055-2011 "General Electric Equipment Distribution Design Specification"
3.6. GB 50217-2007 "Power engineering cable design specifications"
3.7. GB 50116-2013 "Fire Automatic Alarm System Design Specification"
3.8. GB 14048.1-2006 "General principles for low-voltage switchgear and control equipment"
3.9. GB 14287.1-2014 "Electrical fire monitoring system Part 1: Electrical fire monitoring equipment"
3.10. GB 14287.2-2014 "Electrical fire monitoring system Part II: Residual current electrical fire monitoring detector"
3.11. GB 14287.3-2014 "Electrical fire monitoring system Part III: Temperature-type electrical fire monitoring detector"
3.12. GB 14287.4-2014 "Electrical fire monitoring system Part IV: Fault arc detector"
4. System compositionThe electric leakage monitoring system of the Jiwang Kindergarten in Pinggu District of Beijing consists of electrical fire monitoring equipment, electrical fire detectors and leakage current transformers.
The communication bus of the project is connected to a communication bus. After the busses are connected in series in the power distribution room, they are connected to a wall-mounted background to form the major artery of the electrical fire system. The leakage current transformer in the box is connected to the leakage detector through the current line, and the leakage detector shows leakage in real time. The above constitutes a set of stable, accurate and reliable electrical fire monitoring systems. The system network is divided into three layers:
1) Station control management
Station management The management personnel of the electrical fire monitoring system are the direct windows of human-computer interaction and the top part of the system. Mainly by the system software and necessary hardware devices, such as touch screen, UPS power supply and other components. The monitoring system software calculates, analyzes, and processes various types of data on the site, and responds to the on-site operations by means of graphics, digital display, sound, and indicator lights.
The system structure topology is shown in the figure on the right:
Acrel-6000 Electrical Fire Monitoring Background:
5.1 power supply
1 Rated working voltage AC220V (85% to 110%).
2 Standby power supply: When the main power supply is undervoltage or power failure, maintain the monitoring equipment working time ≥ 4 hours.
5.2 Work System
24-hour work system.
5.3 Communication
RS485 bus communication, Modbus-RTU communication protocol, transmission distance 1km, can extend the communication transmission distance through the repeater.
5.4 Monitoring Capacity
1 monitoring equipment can monitor up to 256 monitoring units (detectors);
2 can be connected with ARCM series monitoring detectors.
5.5 Monitoring Alarm Project
1 Residual current fault (leakage): fault cell attributes (part, type);
2 Temperature alarm (over temperature): Fault cell attributes (part, type);
3 Current fault (overcurrent): Fault cell attributes (position, type).
4 monitoring alarm response time: ≤10s;
5 monitoring sound pressure level (A weighting): ≥70dB/1m;
6 Monitoring alarm light display: red LED indicator, red light alarm signal should be maintained until manual reset;
7 monitoring alarm sound signal: can be manually eliminated, when the alarm signal input again, can start again.
5.6 Fault Alarm Project
1 An open circuit or short circuit occurred in the communication cable between the monitoring equipment and the detector;
2 Short circuit or short circuit between the detector and the residual current sensor and temperature sensor;
3 monitoring equipment main power supply undervoltage or power failure;
4 An open or short circuit occurred in the connection between the battery charger and the battery.
5 fault alarm response time: ≤100s;
6 monitoring sound pressure level (A weighting): ≥70dB/1m;
7 monitoring alarm light display: yellow LED indicator, yellow light alarm signal should be maintained until troubleshooting;
8 Fault alarm sound signal: It can be eliminated manually. When there is alarm signal input again, it can start again;
9 During the fault, the normal operation of the non-faulty loop is not affected.
5.7 Control Output
Alarm control output: 1 normally open passive contact; Capacity: AC250V 3A or DC30V 3A.
5.8 Self-inspection project
1 Indicator check: alarm, fault, operation, main power supply, standby power indicator;
2 display inspection;
3 audio device inspection.
Self-check time ≤60s
5.9 event record
1 Record content: Record type, occurrence time, detector number, area, fault description, up to 999 records;
2 record query: according to the record date, type and other conditions.
5.10 Operational Rating
1 daily duty class: real-time status monitoring, event record query;
2 monitoring operation level: real-time status monitoring, event record query, remote reset of the detector, device self-test;
3 system management level: real-time status monitoring, event record query, remote reset of the detector, device self-test, system parameter query of monitoring equipment,
Each module of the monitoring equipment is individually tested and operators are added and removed.
5.11 Using Environmental Conditions
1 Workplaces: fire control rooms, manned shifts (distribution rooms), and walls on staffed rooms;
2 working environment temperature: -10 °C ~ 50 °C;
3 working environment relative humidity: 5% ~ 95% RH;
4 Altitude: ≤ 2500m.
6 System Functions6.1. Monitoring alarm function:
The monitoring equipment can receive the leakage and temperature information of multiple detectors. When the alarm sounds, an audible and visual alarm signal is emitted. At the same time, the red “alarm†indicator light on the equipment is on. The display indicates the alarm location and type of alarm, records the alarm time, and the sound and light alarm keeps Until the display resets the detector remotely. The audible alarm signal can also be manually cancelled using the display “Mute†button.
6.2. Fault alarm function
Communication failure alarm: When a communication failure occurs between the monitoring device and any connected detector, the corresponding detector in the monitoring screen displays a fault prompt, and the yellow “fault†indicator light on the device is on, and a fault alarm sound is emitted. .
Power failure alarm: When the main power supply or standby power supply fails, the monitoring device also emits an audible and visual alarm signal and displays the fault information. You can enter the corresponding interface to view the detailed information and cancel the alarm sound.
6.3. Self-test function
Check if all the status indicators, display screens and speakers in the device are normal.
6.4. Alarm Record Storage Query Function
When leakage, over temperature alarm, or communication or power failure occurs, the alarm location, fault information, alarm time, and other information are stored in the database. When the alarm is removed and the fault is eliminated, it is also recorded. Historical data provides a variety of convenient and fast methods for searching.
6.5. Power Function
When the main power supply has a power failure or undervoltage, the monitoring device can automatically switch to the standby power supply. When the main power supply resumes normal power supply, it automatically switches back to the main power supply, ensuring continuous and smooth operation of the monitoring device during the switchover process.
6.6. Detector Control Functions
By monitoring the software operation, remote reset control can be performed on all detectors connected to the device.
6.7. Authority Control Function
In order to ensure the safe operation of the monitoring system, the monitoring device software operating authority is divided into three levels, and different levels of operators have different operating rights.
7. ConclusionWith the development of smart buildings and the widespread use of electricity, people have become more aware of security awareness. The installation of leakage current fire system in public buildings is an inevitable trend of intelligent construction. The electrical fire system is conducive to discovering hidden dangers and dealing with hidden dangers in time. It is of great significance to prevent fires from happening. Since the system was put into operation, many hidden dangers have been discovered and rectified, which provided scientific basis for the project's fire control management and received favorable comments from customers.
The electric leakage monitoring system of Xinggu Old Apartment in Pinggu District of Beijing City consists of an Acrel-6000/BG electric fire monitoring device and 13 electric fire detectors ARCM300-J4. Acrel-6000 electrical fire monitoring system is an independent research and development by the company to receive the residual current electrical fire detectors and other field equipment signals, in order to achieve the protection of the electrical circuit alarm, monitoring, control, management of the computer running on the industrial level Hardware/software system.
About the author: He Meifang, female, Ankerui Electric Co., Ltd., the main research direction for the smart grid power distribution, Email: Contact: 021-69156950 QQ
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