Abstract: The Ankerui residual current electrical fire monitoring system uses ARCM residual current electrical fire monitoring device or digital residual current transformer to monitor electrical fires in low-voltage distribution systems of buildings such as shopping malls, hotels, airports, banks, hospitals, and factories. This article introduces the leakage fire monitoring system project of Xinggu Elderly Apartment in Pinggu District, Beijing, and focuses on the functions and significance of the Acrel-6000 electrical fire monitoring system.

Keywords: electrical fire detector, monitoring equipment, apartment, Ankrui

1. Preface

Xinggu Senior Apartment in Pinggu District, Beijing is located in Zhongluozhuang Village, Xinggu Street. Our business philosophy is to provide care and attention to every resident with love, sincerity, thoughtfulness, patience, attention to detail, and filial piety; All staff of the Love Home, guided by the principle of putting everything in the best interest of the elderly, are dedicated to creating an ideal home for the elderly with a beautiful environment, harmonious atmosphere, healthy and pleasant, happy and warm atmosphere.

2. System requirement analysis

Detect signals such as leakage current, overcurrent, and overtemperature, issue sound and light alarms, accurately report the fault line address, and monitor changes in the fault point. Store various fault and operation test signals, display system power status.

3. Reference standards

In recent years, in order to increase the monitoring and prevention of electrical fires, the country has successively formulated or revised a number of relevant standards and specifications to strengthen the prevention of electrical fires. The main ones are:

3.1 GB 50016-2014 "Code for Fire Protection Design of Buildings"

3.2.GB 50054-2011 "Code for Design of Low Voltage Distribution"

3.3 JGJ 16-2008 "Code for Electrical Design of Civil Buildings"

3.4 GB 13955-2005 "Installation and Operation of Residual Current Operated Protection Devices"

3.5. GB 50055-2011 "Design Specification for Distribution of General Electrical Equipment"

3.6 GB 50217-2007 "Code for Design of Cables in Power Engineering"

3.7-GB 50116-2013 "Design Specification for Automatic Fire Alarm System"

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: Electrical Fire Monitoring Equipment"

3.10. GB 14287.2-2014 "Electrical Fire Monitoring System Part 2: Residual Current Electrical Fire Monitoring Detector"

3.11. GB 14287.3-2014 "Electrical Fire Monitoring System Part 3: Temperature Measuring Electrical Fire Monitoring Detector"

3.12. GB 14287.4-2014 "Electrical Fire Monitoring System Part 4: Fault Arc Detector"

4. System composition

The leakage fire monitoring system of Xinggu Elderly Apartment in Pinggu District, Beijing consists of electrical fire monitoring equipment, electrical fire detectors, and leakage current transformers.

The communication bus of this project is connected to one communication bus, which is connected in series in the distribution room and then connected to the wall mounted backend to form the main 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 displays the leakage situation in real time. The above constitutes an electrical fire monitoring system with stable signals and reliable accuracy. The network of this system is divided into three layers:

1) Station control management team

The station control management team is responsible for the management personnel of the electrical fire monitoring system, serving as the direct window for human-computer interaction and the top-level part of the system. It mainly consists of system software and necessary hardware devices, such as touch screens, UPS power supplies, etc. The monitoring system software calculates, analyzes, and processes various data information on site, and reflects the on-site operation situation through graphics, digital displays, sounds, indicator lights, and other means.

The system architecture topology diagram is shown in the figure on the right:

5. Electrical fire equipment

Acrel-6000 Electrical Fire Monitoring Backend:

Main technical parameters

5.1 Power Supply

① The rated working voltage is AC220V (85%~110%).

② Backup power supply: In case of undervoltage or power outage of the main power supply, maintain the working time of the monitoring equipment for ≥ 4 hours.

5.2 Work System

24-hour work schedule.

5.3 Communication Method

RS485 bus communication, Modbus RTU communication protocol, transmission distance of 1km, communication transmission distance can be extended through repeaters.

5.4 Monitoring Capacity

① The monitoring equipment can monitor 256 monitoring units (detectors);

② Can be paired with ARCM series monitoring detectors.

5.5 Monitoring and Alarm Projects

① Residual current fault (leakage): Fault unit attributes (location, type);

② Temperature alarm (over temperature): Fault unit attributes (location, type);

③ Current fault (overcurrent): Fault unit attributes (location, type).

④ Monitoring alarm response time: ≤ 10s;

⑤ Monitoring alarm sound pressure level (A-weighted): ≥ 70dB/1m;

⑥ Monitoring alarm light display: red LED indicator light, the red light alarm signal should be maintained until manually reset;

⑦ Monitoring alarm sound signal: can be manually eliminated, and can be restarted when there is another alarm signal input.

5.6 Fault alarm items

① The communication connection line between the monitoring equipment and the detector is broken or short circuited;

② Short circuit or short circuit in the connecting wire between the detector and the residual current sensor or temperature sensor;

③ Monitoring equipment main power supply under voltage or power outage;

④ The connection wire between the charger for charging the battery and the battery is open or short circuited.

⑤ Fault alarm response time: ≤ 100s;

⑥ Monitoring alarm sound pressure level (A-weighted): ≥ 70dB/1m;

⑦ Monitoring alarm light display: yellow LED indicator light, yellow light alarm signal should be maintained until the fault is eliminated;

⑧ Fault alarm sound signal: can be manually eliminated, and can be restarted when there is another alarm signal input;

⑨ During the fault period, the normal operation of non faulty circuits is not affected.

5.7 Control Output

Alarm control output: 1 set of normally open passive contacts; Capacity: AC250V 3A or DC30V 3A

5.8 Self inspection items

① Indicator light inspection: alarm, fault, operation, main power, backup power indicator lights;

② Screen inspection;

③ Inspection of audio components.

Self check time ≤ 60s

5.9 Event Recording

① Record content: Record type, occurrence time, detector number, area, fault description, up to 999 records can be stored;

② Record query: Query based on the date, type, and other conditions of the record.

5.10 Operation Grading

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 detectors, equipment self-test;

③ System management level: real-time status monitoring, event record query, remote reset of detectors, device self-test, monitoring device system parameter query

Each module of the monitoring equipment is individually tested, and operators add and delete them.

5.11 Environmental conditions for use

① Workplace: Fire control room, manned substation (distribution room), walls in manned rooms;

② Working environment temperature: -10 ℃ to 50 ℃;

③ Relative humidity in the working environment: 5% to 95% RH;

④ Altitude: ≤ 2500m.

6 System Functions

6.1. Monitoring and alarm function:

The monitoring equipment can receive leakage and temperature information from multiple detectors, and emit sound and light alarm signals when an alarm is triggered. At the same time, the red "alarm" indicator light on the equipment is on, and the display screen indicates the alarm location and type. The alarm time is recorded, and the sound and light alarm is maintained until the "reset" button on the display screen is pressed to remotely reset the detector. The sound alarm signal can also be manually eliminated using the "mute" button on the display screen.

6.2. Fault alarm function

Communication failure alarm: When a communication failure occurs between the monitoring equipment and any connected detector, the corresponding detector in the monitoring screen displays a fault prompt, and the yellow "fault" indicator light on the equipment lights up and emits a fault alarm sound.

Power failure alarm: When the main or backup power supply fails, the monitoring equipment also emits sound and light alarm signals and displays fault information. You can enter the corresponding interface to view detailed information and cancel the alarm sound.

6.3. Self checking function

Check if all status indicators, displays, and speakers in the device are functioning properly.

6.4. Alarm record storage and query function

When there is a leakage, over temperature alarm or communication or power failure, the alarm location, fault information, alarm time and other information are stored in the database. When the alarm is cleared and the fault is eliminated, it is also recorded. Historical data provides multiple convenient and fast query methods.

6.5. Power Function

When the main power supply experiences a power outage, undervoltage, or other faults, the monitoring equipment can automatically switch to the backup power supply. When the main power supply resumes normal power supply, it will automatically switch back to the main power supply, ensuring the continuous and smooth operation of the monitoring equipment during the switching process.

6.6. Control function of detector

Through monitoring software operation, all detectors connected to this device can be remotely reset and controlled.

6.7. Permission Control Function

To ensure the safe operation of the monitoring system, the software operation permissions of the monitoring equipment are divided into three levels, and operators at different levels have different operation permissions.

7. Conclusion

With the development of intelligent buildings and the widespread application of electricity, people's awareness of safety is increasing. The installation of electric leakage fire systems in public buildings is an inevitable trend in intelligent construction. The electrical fire system is conducive to discovering safety hazards, timely handling safety hazards, and has important significance in preventing fires before they occur. Since the system was put into operation, many hidden dangers have been discovered and rectified, providing a scientific basis for the fire management of this project and receiving high praise from customers.

The leakage fire monitoring system of Xinggu Elderly Apartment in Pinggu District, Beijing consists of one electrical fire monitoring device Acrel-6000/BG and 13 electrical fire detectors ARCM300-J4. The Acrel-6000 electrical fire monitoring system is an industrial grade hardware/software system independently developed by our company to receive signals from residual current electrical fire detectors and other on-site equipment, in order to achieve alarm, monitoring, control, and management of protected electrical circuits.

reference

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