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 Heilongjiang Academy of Agricultural Sciences production building project, the realization of the function of electrical fire monitoring system and its significance are expounded.
Yang Junjun
Ankerui Electric Co., Ltd. Shanghai Jiading 201801
Overview:
The Heilongjiang Academy of Agricultural Sciences was founded in August 1956 and is affiliated to the provincial government and the official department. In 2014, it was approved by the Provincial Preparatory Committee to add the “Heilongjiang Modern Agriculture Research Institute†brand. After more than 50 years of construction and development, it has become the largest agricultural research institution with the largest impact in the province and having important influence at the national and international levels. The hospital directly under the 30 branches (institutes), distributed in different ecological types of the province; built the National Maize Germplasm Improvement Sub-center, the National Rice Germplasm Improvement Sub-center, the National Soybean Germplasm Improvement Sub-center and the National Potato Germplasm 46 Centers and National Centers and Key Laboratories such as the Center for Improvement; 1 post-doctoral workstation for personal affairs, 3,274 employees, including 609 senior scientific research personnel, 15 provincial key discipline leaders, and enjoy the State Council and the province. The government has a special allowance of 163 people. Since the establishment of the hospital, a total of 1222 new varieties of crops have been bred and 536 scientific and technological achievements have been awarded at the provincial and ministerial level, which has made significant contributions to the realization of “ten consecutive increases†in grain production in our province.
Heilongjiang Academy of Agricultural Sciences production building has 139 ARCM300 residual current meters installed in the floor distribution box. The field instrument is connected to the Acrel-6000 cabinet type electrical fire monitoring system in the duty room by bus.
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:
1.1. 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.
1.2. 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.
1.3. 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".
1.4. 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" 》
1.5. 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"
1.6. The power supply of the electrical fire monitoring system shall meet the requirements of GB50052 "Design Specifications for Power Supply and Distribution Systems"
1.7. 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
Heilongjiang Academy of Agricultural Sciences production building electrical fire project consists of electrical fire monitoring background, electrical fire detectors and leakage current transformers.
A total of four communication buses are connected in this project. They run through the distribution boxes and are connected to the corresponding buses. After the bus is connected hand in hand in a distribution box, it is connected to the back of the cabinet to form the aorta of the electrical fire system. The leakage current transformer in the drawer 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:
2.1 Station management
The management of the management of the electrical fire monitoring system is the direct window of human-computer interaction and the uppermost part of the system. It is mainly composed of system software and necessary hardware devices, such as cabinets and UPS power supplies. 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 duty room of the substation.
2.2 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.
2.3 Field device layer
The field device layer is a data acquisition terminal, mainly for the ARCM300 series residual electrical fire monitoring detector.
The system structure topology is as follows:
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3. Electrical fire equipment
3.1 Main equipment parameters:
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a 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 ≥ 30 minutes
b working system
24-hour work schedule
c Communication method
RS485 bus communication, Modbus-RTU communication protocol, transmission distance of 1km, can extend the communication transmission distance through the repeater.
d monitoring capacity
1 The monitoring device can monitor up to 1024 monitoring units (detectors).
2 can be equipped with ARCM series monitoring detectors.
e Monitoring alarm items
1 Residual current fault (leakage): fault unit attribute (part, type)
2 temperature alarm (over temperature): fault unit attribute (part, type)
3 current fault (overcurrent): fault unit attribute (part, type)
Monitoring alarm response time: ≤30s
Monitoring alarm sound pressure level (A weighting): ≥70db/1m
Monitoring alarm light display: red LED indicator
Monitor alarm sound signal: Manually cancel, when the alarm signal is input again, it can be started again
f Fault alarm item
1 The connection between the monitoring device and the detector is open and shorted.
2 main power undervoltage or power failure
3 standby power battery short circuit, open circuit
Fault alarm response time: ≤100s
Monitoring alarm sound pressure level (A weighting): ≥70db/1m
Monitoring alarm light display: yellow LED indicator
Fault alarm sound signal: manual elimination, can be started again when there is alarm signal input again
The normal operation of the non-faulty loop is not affected during the fault
g control output
Alarm control output: normally open passive contact, capacity: AC250V 3A or DC30V 3A
h Self-test items
1 Indicator check: alarm, fault, operation, main power, standby power indicator
2 monitor check
3 audio device inspection
Self-test time ≤60s
i history
1 Record content: record type, time of occurrence, detector, area, fault description.
2 Record query: Query according to the date and type of the record.
j operation rating
1 Daily duty class: real-time status monitoring, history query.
2 Monitoring operation level: real-time status monitoring, history query, remote reset of detector.
3 system management level: real-time status monitoring, history query, remote reset of detectors, remote modification of detector parameters, system parameter setting and modification of monitoring equipment, operator addition and deletion.
k Use environmental conditions
1 Workplace: Fire control room, or installed side by side with fire control console
2 Working environment temperature: 0 ° C ~ 40 ° C
3 Working environment relative humidity: 5% ~ 95% RH
4 Altitude: ≤2500m
j main components
1 main control unit: industrial grade computer (CPU frequency is not lower than 2.0G, 1G and above memory), configuration keyboard, mouse and 17" liquid crystal display;
2 I/O modules: built-in ARTU remote intelligent I/O modules developed by the company;
3 sound and light alarm: built-in active speakers, LED indicators;
4 button: mute button, reset button;
5 Backup power supply: built-in 1kVA online long-acting UPS, 3 12V/24Ah maintenance-free batteries.
3.2, ARCM300 series instruments
The ARCM300 residual current electrical fire monitoring detector is designed for TT and TN systems below 0.4kV. It monitors and manages fire hazard parameters such as residual current and conductor temperature in the distribution circuit to prevent electrical fires. And real-time monitoring of multiple power parameters to provide 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".
4 system function
4.1 monitoring alarm function
The monitoring equipment can receive the leakage 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 cabinet lights up. The display indicates the alarm part and leakage, temperature value, record alarm time, sound and light alarm. Keep it until the detector is reset remotely by pressing the Reset button. The audible alarm signal can also be manually removed using the mute button.
4.2 control output function
When the monitored loop leakage alarm, 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.
4.3 fault alarm function
Communication failure alarm: When a communication failure occurs between the monitoring device and any of the connected detectors, the corresponding detector in the monitoring screen displays a fault indication, and the yellow “fault†indicator on the cabinet lights up, and a fault alarm sound is emitted. .
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.
4.4 self-test function
Check that all status indicators, displays, and audio devices in the device are working.
4.5 alarm record storage query function
When leakage, 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 cancelled or the fault is eliminated, the same is recorded. Historical data provides a variety of convenient and fast ways to query.
4.6 power function
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.
4.7 pairs of detector control functions
Through the system software operation, all the detectors connected to the device can be remotely controlled, including the setting of alarm setting value, communication address and other parameters and remote reset of the detector.
4.8 permission control function
In order to ensure the safe operation of the monitoring system, the operating authority of the monitoring device system software is divided into three levels, and operators of different levels have different operating rights.
5 Conclusion
Heilongjiang Academy of Agricultural Sciences production building electrical fire monitoring system consists of electrical fire monitoring device Acrel-6000, leakage fire detector ARCM300. 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 parameters in the field protection circuit exceed the alarm set value, the alarm signal and control signal can be issued, and the alarm part can be indicated and the alarm can be saved. information. The field instrument is connected to the Acrel-6000 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. The application of Acrel-6000 electrical fire monitoring system in the production building of Heilongjiang Academy of Agricultural Sciences, real-time monitoring of the leakage of various electrical circuits on the site, sound and light alarm for loops with abnormal conditions, timely reminding the on-site duty personnel to ensure the safety of power supply Reliable and avoid loss of field equipment and casualties.
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]. Zhou Zhong. Application of power meter in electric energy metering of large public buildings [J]. Modern Building Electric 2010. 6
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
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