Abstract Ankerui Residual Current Electric Fire Monitoring System conducts electrical fire monitoring on low-voltage distribution systems in shopping malls, hotels, airports, banks, hospitals, factories and other buildings through ARCM residual current electrical fire monitoring devices or digital residual current transformers. . This paper introduces the functions and significance of the Acrel-6000 electrical fire monitoring system through the introduction of the electrical fire monitoring system project of the Second Affiliated Hospital of Mudanjiang Medical College.
Keywords: electrical fire detector, monitoring equipment, hospital, Ankerui
The Second Affiliated Hospital of Mudanjiang Medical College is a three-level general hospital integrating medical treatment, teaching, scientific research and preventive health care. It is the only “American Cleft Lip and Cleft Smile Train Cooperative Hospital” in Mudanjiang, and “World Ophthalmology Organization Mudanjiang, Heilongjiang Province” The City Li Zhaoji Eye Center is located in the Second Affiliated Hospital of Mudanjiang Medical College and has the only Wuguan County Hospital in Mudanjiang City.
The second affiliated hospital of Mudanjiang Medical College was the Mudanjiang Railway Central Hospital. It was built on September 15, 1946 and is a health center with only 8 employees. After the national liberation, that is, the number of employees increased to 70 in 1949. By 2004, it has become a comprehensive “second-class A” hospital integrating medical treatment, health care, emergency first aid, teaching and scientific research. The hospital covers an area of ??31,405 square meters, with a construction area of ??35,489.69 square meters. It has medical equipment worth 39.42 million yuan, with a fixed asset value of 89.97 million yuan. The provincial editorial office has 571 authorized personnel and 800 beds. Among the staff of the hospital, There are 239 people with intermediate titles or above and 332 with junior titles or below.
2. System requirements analysis
Detection of leakage current, over current, over temperature and other signals, sound and light signal alarm, accurately report the fault line address, monitor the change of the fault point. Store various fault and operational test signals to display system power status.
3. Reference standard
In recent years, in order to increase the intensity of electrical fire monitoring and prevention, 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.GB50045-95 (2005 edition) "High-rise civil building design fire code specification", which stipulates in clause 9.5.1: high-rise buildings should be equipped with leakage fire alarm system in places with high fire risk and dense personnel.
3.2.GB50016-2006 "Code for Fire Protection of Building Design", as specified in Article 11.2.7: The following places should be equipped with an electrical fire monitoring system for residual current action. These venues include various types of theaters, galleries, warehouses, residential communities, hospitals, shops, schools, and more.
3.3. The relevant provisions of the national standard "Building electrical fire prevention requirements and testing methods" also clearly require that "the residual current action protector that automatically cuts off the power or alarm should be set at the power incoming end".
3.4. The products of the electrical fire monitoring system shall meet: GB14287.1-2005 "Electrical fire monitoring equipment", GB14287.2-2005 "Residual current type electric fire monitoring detector", GB14287.3-2005 "Temperature type electric fire" Monitoring detector
3.5. Installation and operation of electrical fire monitoring system should meet GB13955-2005 "Residual current action protection device installation and operation"
3.6. The power supply of the electrical fire monitoring system shall meet the requirements of GB50052 “Design Specifications for Power Supply and Distribution Systems”.
3.7. The design of the electrical fire monitoring system shall meet the requirements of the Design Method of Electrical Fire Monitoring System (Interim Provisions)
4. System composition
The electrical fire monitoring system of the Second Affiliated Hospital of Mudanjiang Medical College consists of electrical fire monitoring equipment, electrical fire detectors and leakage current transformers.
The communication bus of this project is connected to a communication bus. After the bus is connected hand in hand in the power distribution room, it is connected to the wall-mounted background to form the main artery of the electrical fire system. The leakage current transformer in the cabinet is connected to the leakage detector through the current line, and the leakage detector displays the leakage condition in real time. The above describes a set of electrical fire monitoring systems with stable signal and reliable accuracy. The system networking is divided into three layers:
1) Station management
The management of the station control management system for the electrical fire monitoring system is the direct window of human-computer interaction and the uppermost part of the system. Mainly composed of system software and necessary hardware equipment, such as touch screen, UPS power supply and so on. The monitoring system software calculates, analyzes, and processes various types of data information on the site, and responds to the on-site transportation situation by means of graphics, digital display, sound, and indicator lights.
Monitoring host: used for data collection, processing, and data forwarding. Provides data interfaces for system management, maintenance, and analysis within and outside the system. The system structure topology is shown in the following figure:
UPS: Ensure the normal power supply of the computer monitoring system, and ensure the normal operation of the station management management equipment when the whole system has power supply problems. The background monitoring device is set in the self-dimension substation.
2) Network communication layer
Communication medium: The system mainly adopts shielded twisted pair cable, realizes real-time communication between field device and host computer by RS485 interface and MODBUS communication protocol.
3) Field device layer
The field device layer is a data acquisition terminal, mainly for the ARCM200L series of residual electrical fire monitoring detectors.
5. Electrical fire equipment
5.1, Acrel-6000 electrical fire monitoring background:
The main technical parameters
24-hour work system.
RS485 bus communication, Modbus-RTU communication protocol, transmission distance of 1km, can extend the communication transmission distance through the repeater.
Monitoring alarm items
Fault alarm item
Alarm control output: 1 set of normally open passive contacts; capacity: AC250V 3A or DC30V 3A.
5.2, ARCM200L series instruments
The ARCM200L residual current type electrical fire monitoring detector is designed for TT and TN systems below 0.4kV. It monitors and manages fire risk parameters such as residual current, wire temperature, over current and over voltage in the distribution circuit. Thereby preventing the occurrence of electrical fires and real-time monitoring of various power parameters, providing accurate data for energy management. The product adopts advanced microcontroller technology, with high integration, small size, convenient installation, intelligent, digital and networked. It is an ideal choice for building electrical fire prevention monitoring and system insulation aging prediction. The product complies with the standard requirements of GB14287.2-2005 "Electrical Fire Monitoring System Part 2: Residual Current Electrical Fire Monitoring Detector".
6 system function
Monitoring alarm function
The monitoring equipment can receive the residual current and temperature information of multiple detectors, and emit an audible and visual alarm signal when the alarm occurs. At the same time, the red “alarm” indicator on the device lights up, the display indicates the alarm location and alarm type, records the alarm time, and the sound and light alarm. Keep it until the detector is reset remotely by pressing the device's Reset button or the touch screen's Reset button. The audible alarm signal can also be manually removed using the touch screen "mute" button.
Control output function
When the monitored circuit alarms, the control output relay is closed to control the protected circuit or other equipment. When the alarm is eliminated, the control output relay is released.
Fault alarm function
Communication failure alarm: When a communication failure occurs between the monitoring device and any of the connected detectors or the detector itself fails, the corresponding detector in the monitoring screen displays a fault indication, and the yellow “fault” indicator on the device lights up. And issue a fault alarm sound.
Power failure alarm: When the main power or backup power 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 release the alarm sound.
Check that all status indicators, display, and speakers in the device are normal.
Alarm record storage query function
When residual current, over temperature alarm or communication or power failure occurs, the alarm part, fault information, alarm time and other information are stored in the database. When the alarm is released and the fault is eliminated, the same is recorded. Historical data provides a variety of convenient and fast ways to query.
When the main power supply has a power failure, undervoltage, etc., the monitoring equipment can automatically switch to the standby power supply. When the main power supply returns to normal power supply, it automatically switches back to the main power supply, ensuring continuous and smooth operation of the monitoring equipment during the switching process.
Detector control function
Remote monitoring of all detectors connected to the unit is possible through monitoring software operation.
Access control function
In order to ensure the safe operation of the monitoring system, the monitoring device software operation authority is divided into three levels, and different levels of operators have different operation rights.
With the development of intelligent buildings and the widespread use of electricity, people's awareness of safety is becoming higher and higher. Installation of leakage fire system in public buildings is an inevitable trend of intelligent construction. The electrical fire system is conducive to the detection of potential safety hazards, timely handling of safety hazards, and the importance of fire prevention and precaution. Since the system was put into operation, many hidden dangers have been discovered and rectified, which provided a scientific basis for the fire management of the project and has been well received by customers.
The electrical fire monitoring system of the second affiliated hospital of Mudanjiang Medical College consists of the electrical fire monitoring device Acrel-6000/BG and the electrical fire detector ARCM200BL. The Acrel-6000 electrical fire monitoring system is an industrial grade that is independently developed by the company to receive field devices such as residual current electrical fire detectors to achieve alarm, monitoring, control, and management of protected electrical circuits. Hardware/software system.
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Rated operating voltage AC220V (85 ~ 110).
Backup power supply: When the main power supply is under voltage or power failure, maintain the monitoring equipment working time ≥ 4 hours.
The monitoring device can monitor up to 256 monitoring units (detectors);
It can be equipped with ARCM series monitoring detectors.
Residual current fault (leakage): fault cell attribute (part, type);
Temperature alarm (over temperature): Fault unit attribute (part, type);
Current fault (overcurrent): Fault cell attribute (part, type).
Monitoring alarm response time: ≤10s;
Monitoring alarm sound pressure level (A weighting): ≥70dB/1m;
Monitoring alarm light display: red LED indicator, red light alarm signal should be maintained until manual reset;
Monitor alarm sound signal: It can be manually eliminated. When there is an alarm signal input again, it can be started again.
The communication connection between the monitoring device and the detector is broken or shorted;
Short circuit or short circuit between the detector and the residual current sensor and the temperature sensor;
Monitoring equipment main power supply undervoltage or power failure;
The cable between the charger that charges the battery and the battery is broken or shorted.
Fault alarm response time: ≤100s;
Monitoring alarm sound pressure level (A weighting): ≥70dB/1m;
Monitoring alarm light display: yellow LED indicator, yellow light alarm signal should be kept until troubleshooting;
Fault alarm sound signal: can be manually eliminated, and can be started again when there is an alarm signal input again;
The normal operation of the non-faulty loop is not affected during the fault.
Indicator light check: alarm, fault, operation, main power supply, standby power indicator light;
Audio device inspection.
Self-test time ≤60s
Recorded content: record type, time of occurrence, detector number, area, fault description, up to 999 records;
Record query: Query according to the date and type of the record.
Daily duty class: real-time status monitoring, event record query;
Monitoring operation level: real-time status monitoring, event record query, remote reset of detector, device self-test;
System management level: real-time status monitoring, event record query, remote reset of detector, device self-test, monitoring device system parameter query
Each module of the monitoring device is individually detected, added and deleted by the operator.
Workplace: fire control room, manned substation (distribution room), wall on room where someone is on duty;
Working environment temperature: -10 ° C ~ 50 ° C;
Working environment relative humidity: 5 ~ 95 RH;
Altitude: ≤ 2500m.