This paper introduces the functions and significance of the Acrel-6000 electrical fire monitoring system through the introduction of the Ningbo Port Museum electrical fire monitoring system project. Crimped Wire Mesh,Stainless Steel Crimped Wire Mesh,Double Crimped Wire Mesh,Steel Crimped Wire Mesh ANPING HONGYU WIREMESH CO.,LTD , https://www.hongyufence.com
Yang Junjun
Ankerui Electric Co., Ltd. Shanghai Jiading
0, preface
In the past 10 years, the number of electrical fires in China has been the highest in the total number of fire accidents. According to the fire data of the Fire Department of the Ministry of Public Security, there were 159,000 fires in 2007 (excluding forests, grasslands, military, underground underground fires, the same below). From the direct cause of the fire, the electrical fire caused the most, a total of 45,703. Since 2008, a total of 28.3 million fires occurred. In 2008, a total of 133,000 fires occurred. Electrical causes such as short-circuit, overload, and electrical equipment failures caused 40,000 fires, accounting for 30.1% of the total, and the proportion increased by 1.3 percentage points over 2007. The proportion of electrical fire accidents has increased year by year, which is worrying. For the severe electrical fire situation, early prediction, early warning, and forecasting have become the top priority of fire protection work, and the occurrence of electrical fires at the source has become the focus of attention. The task of preventing and effectively curbing electrical fires is imminent. Relevant national departments have successively formulated or revised relevant standards and regulations, and required to set up an electrical fire monitoring and alarm system in the building.
According to the new standard of electrical fire monitoring system (GB14827-2014), the leakage monitoring system of Ningbo Port Museum is taken as an example to introduce the application of Acrel-6000 electrical fire monitoring system in museums and large-scale activities.
1. Project introduction
Ningbo China Port Museum is located in Yangsha Mountain Scenic Area, Chunxiao Binhai New City, Beilun District, Ningbo City, Zhejiang Province. It covers an area of ​​78 mu and has a total investment of 680 million yuan. It is funded by the Beilun District People's Government of Ningbo, and is built by the Port Museum and the National Underwater Cultural Heritage. The two parts of the Ningbo base were protected and opened in mid-October 2014. According to the relevant electrical design, the project will forecast and monitor the fires caused by electric leakage and leakage due to electric leakage in the power distribution rooms of all floors of the museum. Accurately monitor the faults and abnormal conditions of electrical lines, find fire hazards of electrical fires, and promptly alert people to eliminate these hidden dangers. Help users save labor costs, improve work efficiency, and reduce the probability of fire.
The system detects the leakage current, over-current, over-temperature and other signals of each power circuit in the field, and accurately reminds the staff of the location of the line fault and monitors the change of the fault point by means of sound and light alarm. Store various faults and operation test signals, and display the system power status to effectively prevent common electrical fire accidents caused by electric leakage and ensure the safety of people's lives and property.
2, reference standard
This system complies with the National Standard of the People's Republic of China GB14287.1-2014 "Electrical Fire Monitoring System Part 1: Electrical Fire Monitoring Equipment".
3, the basic composition of the system and working principle
3.1 Basic components
According to the national standard GB14287-2014 "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 monitoring The detector consists of three basic product categories: the detector and the temperature-measuring electrical fire monitoring detector. Among them, the residual current type electrical fire monitoring detector is composed of a monitoring detector and a residual current transformer; the temperature measuring type electrical fire monitoring detector is composed of a monitoring detector and a temperature measuring sensor.
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, uses the MODBUS communication protocol bus type connection, and then enters the monitoring host through the Category 5 TCP/TP protocol.
1) The field device layer is mainly used to connect various types of leakage fire detectors for leakage and temperature signal acquisition and measurement in the network, and is also a necessary basic component for constructing the monitoring system. Not only shoulders the burden of collecting data, but also the terminal component that executes background control commands.
2) The communication control layer is mainly composed of a protocol interface converter and a bus network. This layer is a bridge for data information exchange. Different interface conversion devices provide various interfaces such as RS232, RS422, RS485, SPABUS, etc., and Ethernet. The networking mode is flexible, supporting peer-to-peer communication, fieldbus network, Ethernet, etc. Configuration network. The protocol interface converter is mainly used to directly transfer various control commands of the host computer to the on-site leakage fire detector table, and is responsible for collecting, classifying and storing the data information returned by the leakage fire detector, such as temperature/residual current, etc. .
3) The management measurement and control layer is for the management of fire control. This layer is directly facing the user. This layer is also the uppermost part of the system, mainly consisting of electrical fire monitoring system software and necessary hardware equipment such as human-machine interface, printer, UPS, etc. The software part has a good human-computer interaction interface, and reads various kinds of data information collected by the front-end machine through the data transmission protocol, and automatically performs calculation and processing, and reflects the operation state of the scene by means of graphics, digital display, sound, etc., and Accept the operation command of the manager, send and detect the execution status of the operation in real time to ensure the normal operation of the power supply unit.
3.2 Working principle
The basic principle is that when the parameters such as leakage current and temperature in the electrical equipment are abnormal or abrupt, the terminal probe (such as residual current transformer, temperature sensor, etc.) uses the electromagnetic field induction principle and the temperature effect to collect the information. And sent to the monitoring detector, after amplification, A/D conversion, CPU to analyze the amplitude of the change, judge, and compare with the alarm set value, once the set value is exceeded, an alarm signal is sent, and also transmitted In the monitoring equipment, the monitoring equipment further identifies and judges. When it is confirmed that a fire may occur, the monitoring host issues a fire alarm signal, lights up the alarm indicator, emits an alarm sound, and displays a fire alarm and other information on the LCD screen. . On the basis of the information displayed above, the on-duty personnel quickly go to the scene of the accident to check and process the alarm information to the centralized console.
3.3 Design, installation and wiring design of the monitoring system
The electrical fire monitoring equipment and the alarm signal of the system shall be located in the fire control room or on the place where someone is on duty. The main unit "target=_blank> machine power should be taken from the fire power supply (AC220V) of the control center. Each monitoring detector uses on-site power supply, and the power access point should be at the upper end of the circuit breaker.
1) Installation design of the internal form of the power distribution cabinet
This project is a new construction project. All monitoring detectors are installed in the power distribution cabinet inside the substation, and are installed in the panel of the power distribution cabinet by embedded installation. Staff can view the leakage and temperature information of each circuit through the panel button. The residual current transformer is installed on the A, B, C three-phase power line and the N line. The PE line must not pass through the transformer and be firmly fixed. The connection between the detector and the transformer should be shielded. The temperature sensor is A thermistor NTC can provide a temperature reference of -10-120 ° C, and the thermistor can be connected to the leakage fire monitoring detector through a wire.
2) Installation design of the entire leakage fire monitoring system
Each leakage monitoring detector on the site has a 485 communication interface. All the detectors in the field must be connected in series by hand through the shielded twisted pair. When connecting, it should be noted that the number of 485 bus connections is not more than 32, and It is appropriate to be around 20. When installing the wiring, attention should be paid to the separation of the strong and weak electric wires. The recommended wire diameter of the wires should be not less than 1.0mm2. The shielding layer of the shielding wire should be well grounded. The end of each bus should be increased by about 100 ohms. Matching resistance. The wiring is neat and tidy, bundled into bundles, and the flame-retardant PVC pipe, metal pipe and metal trunking can be used for threading. After the pipe or the wire trough is placed, the nozzle and the notch should be sealed.
3.4 Product selection and introduction
The entire port museum includes port museums, aquariums, temporary exhibition halls, conference centers, offices, restaurants and so on. The ARCM300 series, ARCM100-Z residual current monitoring detector and AKH-0.66/L residual current transformer are installed in the power distribution cabinet. The AcrelAcrel-6000/Q200 electrical fire monitoring system for leaking fire monitoring equipment in the fire control center facilitates the uniform management of museum staff.
The ARCM300 and ARCM100-Z series of electrical fire monitoring detectors are intelligent detector products that comply with GB 14287-2014. The product can be used in a large number of online or stand-alone applications (with leakage/overcurrent/temperature detection and alarm functions, and optional functions: it can automatically cut off the monitored circuit when alarming, that is, it has relay output function). It integrates electrical fire monitoring detection, alarm function and power distribution monitoring function. The ARCM100-Z is a comprehensive leakage fire detector. It also has parameters such as measuring current, voltage, electricity and power. It has high intelligence and function. Complete, reliable performance, mini design, beautiful appearance, simple setting, rail-mounted installation and so on. It is the crystallization of a refreshing new design and is another new contribution to the prevention of electrical fire accidents.
The electrical fire monitoring detector (hereinafter referred to as “monitoring detectorâ€) is composed of residual current transformer, temperature sensor and monitoring alarm. When the residual current transformer in the protected line (hereinafter referred to as “transformerâ€) detects the remaining When the current exceeds the preset value of the monitoring alarm or the temperature detected by the temperature sensor exceeds the preset value, the monitoring alarm sends an audible and visual alarm signal and a control signal after being analyzed and confirmed. The monitoring alarm can display the leakage current of the alarm line, the temperature of the sensor, and so on. When the monitoring alarm has an alarm message, the relay is activated. It can directly display the detection current value and temperature value, without occupying large equipment sites, saving the cost of fire protection equipment and saving power energy.
Acrel-6000 series monitoring equipment is the top of the whole electrical fire monitoring. It can connect multiple ARCM series detectors to form a full-featured electrical fire monitoring system with sound and light alarm function, and synchronous display of alarm circuit, its alarm information. It can be stored for more than 12 months. The backup uninterruptible power supply can ensure continuous operation for more than 4 hours after the mains power is lost. The monitoring system is divided into three types: wall-mounted, piano and cabinet. The effective communication distance can reach more than 1200 meters. Data exchange between equipment and other systems such as alarm and fire linkage systems, power monitoring systems, etc. is possible. And the series of monitoring equipment has self-checking function, from the hardware, software, communication lines, power supply aspects of the system self-test, in order to keep track of the system product operating status, to ensure the reliability of the system operation.
3.5 software interface
This set of PC software Acrel-6000 electrical fire system. Mainly has the following features: friendly human-machine interface, real-time and timed collection of residual current data and temperature of field devices, and alarm prompt sound and light alarm and other functions. The customer can set the alarm temperature value and leakage current value according to actual needs. When the alarm fault is released, the alarm can be reset remotely. The system can record alarm events, dates, alarm values, and crossing values, and generate reports.
1) Data collection and display 
The on-site leakage fire monitoring detector uploads the collected data to this interface, and the user can modify the rights of the circuit name, monitoring location, and monitoring area as needed. When the measured value of the residual current is greater than the alarm setting, the system alarm status indicator will flash automatically, and the color of the alarm unit in the corresponding interface changes, which is convenient for the operation personnel to check and handle the alarm.
2) Fault display
When the monitoring device detects a device failure, the status of the faulty unit in the monitoring main interface changes, displays the specific information of the faulty unit, and issues a fault alarm sound. Support for fault alarm sound elimination manually. 
3) Fault and alarm record 
With event storage function, the alarm can record the time, type, parameter and alarm value of the fault and alarm occurrence. According to the alarm record, the fault cause can be analyzed to provide a basis for eliminating the fault.
4 Conclusion
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 operation of the Ningbo Port Museum, the system has discovered and rectified many hidden dangers, greatly improved the work efficiency of the staff, ensured the stable and orderly work of the museum's daily work, and ensured the safety of people's lives and property, and for public buildings. The fire management provides a scientific basis.
references
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guidelines of Power Electrical Measurement Digital Instrumentation [M]. Beijing. China Electric Power Press. 2007. 4
[2]. Wu Enyuan Zhou Zhong Electrical Fire Monitoring System Design and Application Atlas 2012. 8
About the Author
Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn