This paper briefly describes the composition principle of the electrical fire monitoring system, and analyzes the design basis and related specifications of the electrical fire monitoring system in the application. Finally, through the introduction of Ankerui residual current electric fire monitoring system in the Jinmao Hyatt Hotel project, the realization of the function of the electrical fire monitoring system and its significance are expounded.
Yang Junjun An Kerui Electric Co., Ltd. Shanghai Jiading
0 Overview
Hyatt Regency Shanghai Chongming is located in the eastern part of Chongming Ecological Island, adjacent to the golf course and health spa. The hotel is surrounded by ecological attractions such as Dongtan Wetland Park, Dongping National Forest Park and Lavender Romantic Manor.
Hyatt Regency Shanghai Chongming is a modern Chinese style building with a modern architectural style that blends naturally with the surrounding eco-environment and incorporates Shanghai's native elements and resort styles on a modern and contemporary basis. The in-house rooms are rich in Chinese flavours and offer complimentary wireless Internet access, mini bar snacks and beverages.
In addition, the hotel has a number of leisure and entertainment facilities such as catering, swimming pool, fitness, etc.; banquets, large-scale conferences and other star-rated facilities are available to provide you with a full range of concierge services.
This project is the electrical fire system of Hyatt Regency Jinmao. There are 119 ARCM200BL-J1 residual current fire detectors on the site of Hyatt Regency Jinmao. It is installed at the entrance of the distribution box of the floor and basement. The on-site fire detector is connected to the Acrel-6000/G cabinet type electric fire monitoring system of the control center by bus. The system has the advantages of convenient installation and transportation, high cost performance and convenient maintenance.
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1 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:
(1). It is GB50045-95 (2005 edition) "Code for Fire Protection Design of High-rise Civil Buildings", which stipulates in Article 9.5.1 that it is necessary to install a leakage fire alarm system in places with high fire risk and dense personnel in high-rise buildings.
(2). It is GB50016-2006 "Code for Fire Protection of Building Design", which is stipulated in Article 11.2.7: The following places should be equipped with residual current action electrical fire monitoring system. These venues include various types of theaters, galleries, warehouses, residential communities, hospitals, shops, schools, and more.
(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".
(4). The products of the electrical fire monitoring system shall meet: GB14287.1-2005 "Electrical Fire Monitoring Equipment", GB14287.2-2005 "Residual Current Electric Fire Monitoring Detector", GB14287.3-2005 "Measurement Temperature Electric Fire Monitoring and Detection" 》
(5). The installation and operation of the electrical fire monitoring system shall meet the requirements of GB13955-2005 "Installation and operation of residual current action protection device"
(6). The power supply of the electrical fire monitoring system shall meet the requirements of GB50052 "Design Specifications for Power Supply and Distribution Systems"
(7). The design of the electrical fire monitoring system shall meet the requirements of the Design Method of Electrical Fire Monitoring System (Interim Provisions)
2 system components
According to the national standard GB14287-2005 "Electrical fire monitoring system" and related specifications "Electrical fire monitoring system design method" (interim regulations), the basic components of the electrical fire monitoring system should include: electrical fire monitoring equipment, residual current electrical fire It consists of three basic product categories: monitoring detectors and temperature-measuring electrical fire monitoring detectors.
The residual current type electrical fire monitoring system adopts a layered distributed structure, which is composed of a station control layer, a network communication layer and a field device layer. Each electrical fire monitoring detector accesses the communication server through the shielded twisted pair RS485 interface, adopts the MODBUS communication protocol bus type connection, and then enters the industrial switch through the Category 5 TCP/TP protocol, and then reaches the monitoring host through the optical cable.
System networking structure
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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.
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 control center.
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 the ARCM200BL-J1 residual electrical fire monitoring detector. The ARCM200 residual current 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, conductor temperature, overcurrent and overvoltage in the distribution circuit. Thereby preventing the occurrence of electrical fires. 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".
The distributed I/O controller connected to the fieldbus constitutes a data collection terminal and uploads the collected data to the data center. The measurement detector is responsible for the most basic data acquisition tasks, and the monitored data must be transmitted to the monitoring host in complete, accurate and real-time. It is convenient for the operating personnel to monitor the running status of the field equipment, fault alarms, etc., to effectively prevent fire accidents.
3 system characteristics and working principle
The characteristic of the electrical fire monitoring system is that the residual current electrical monitoring is an advanced pre-alarm system. Unlike the traditional automatic fire alarm system, the early warning of the electrical fire monitoring system is to avoid losses, while the traditional automatic fire alarm system is to reduce losses. Therefore, this means that whether it is a new or rebuilt project, especially the unit that has installed the automatic fire alarm system, the root cause of the electrical fire monitoring system still needs to be installed.
The electrical fire monitoring system measures two physical quantities of residual current and temperature.
The residual current measurement is based on Kirchhoff's current law: at the same time, the sum of the current vectors flowing into and out of a node in the circuit is zero. Taking the TN-S system as an example, A/B/C/N is simultaneously passed through the residual current transformer. When there is no leakage in the system, the current vector sum of the residual current transformer flowing into and out is zero. At this time, the residual current The secondary current induced by the transformer is also 0; when a relatively large earth leakage occurs, the current vector sum of the current transformer flowing into and out of the residual current is no longer zero, and its magnitude is equal to the current flowing from the earth, that is, the leakage current. The leakage signal is transmitted to the electrical fire detector through the secondary wiring of the residual current transformer, and is sent to the CPU after operation amplification, A/D conversion, and after a series of algorithms, the amplitude of the change is analyzed and judged, and The alarm set value is compared. If the set value is exceeded, an audible and visual alarm signal is sent and sent to the background electrical fire monitoring device.
The temperature measurement uses a temperature sensor, which is generally measured using a Pt100 sensor. This type of temperature sensor is stable in temperature measurement and has a wide measuring range. It is suitable for monitoring cable temperature and ambient temperature in the field. When the temperature changes, the resistance value of Pt100 changes in the same proportion. The resistance signal is transmitted to the electrical fire detector. After a series of signal conversion and calculation, the final result is compared with the temperature alarm setting. If the value exceeds the fixed value. An audible and visual alarm signal is sent and sent to the background electrical fire monitoring device.
4 System Introduction
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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. The system is applied to the fire control center of large shopping malls, living quarters, production bases, office buildings, shopping malls and other areas, and telemetry, remote adjustment, remote control and remote signaling of detectors scattered in the building are convenient for monitoring and management. The system uses a standard Modbus field bus to connect detectors with communication functions. When the detected parameter in the field protection circuit exceeds the alarm set value, it can send out alarm signals and control signals, can indicate the alarm part and save the alarm. information.
The main technical parameters
(1). Power supply:
1 rated working voltage AC220V (-15% ~ +10%)
2 Backup power supply: When the main power supply is under voltage or power failure, maintain the monitoring equipment working time ≥ Hardware Business Network Information Center) http://news.chinawj.com.cn
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