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 Wuxi Zhonghang Thunder and Lightning 613 project, the realization of the function of electric fire monitoring system and its significance are expounded.
Yang Junjun
Ankerui Electric Co., Ltd. Shanghai Jiading
0 Overview
Leidian Institute is affiliated to AVIC Aeronautical Systems Co., Ltd. and is a member of AVIC Corporation. It is the only military research institute specializing in the development of airborne/elastic radars in China. It is responsible for the multi-type of major arms, sea and air. The development of military equipment has occupied an important position in the field of domestic airborne radar.
The current site of the R&D Center of Lightning Institute covers an area of ​​37 mu. With the increase of the military products of the Thunder and Light Railway and the continuous expansion of the development scale, the existing research sites can no longer meet the strategic development needs of the institute. Therefore, in accordance with the content of the memorandum of cooperation signed by AVIC Aeronautical Systems Co., Ltd. and Wuxi Municipal Government, the Thunder and Light Institute decided to build a new R&D center in Shanshuicheng Science and Education Industrial Park in Binhu District, Wuxi City.
The new R&D center invested a total of 1 billion yuan and purchased 115 mu of land with a total construction area of ​​about 120,000 square meters.
The new R&D center is located in the high-tech R&D center. It adopts a one-stage planning and two-stage implementation principle, and starts two national key laboratory construction projects of advanced RF simulation and antenna comprehensive testing to meet the urgent needs of the new generation of aviation weapons development; Follow-up construction of office, test and trial production sites.
In terms of construction planning, the new R&D center adopts a generalized design concept, which fully adapts to the needs of product development and development; architecture and planning design combines international advanced design connotation with regional landscape environment and regional style innovation; especially considering “low consumption, The requirements of low pollution and low emission use the latest building energy-saving structure and energy-saving and environmental protection technology, and the R&D center will strive to become a green building group.
This project is the new fire research system of Wuxi Zhonghang Thunder and Lightning 613. The new R&D center of Wuxi Zhonghang Thunderbolt 613 has 24 ARCM200L-Z residual current fire detectors, 2 ARCM200BL-J1 residual current fire detectors, and ARCM200BL. -J4 residual current type fire detectors are installed at the entrance of the floor and basement distribution box. The on-site fire detector is connected to the Acrel-6000/B wall-mounted electrical 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.
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 ARCM200L-Z, ARCM200BL-J1, ARCM200BL-J4, and residual electrical fire monitoring detectors. 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 ≥ 4 hours
(2). Work system:
24-hour work schedule
(3). Communication method:
RS485 bus communication, Modbus-RTU communication protocol, transmission distance 1km, can extend communication transmission distance through repeater
(4). Monitoring capacity:
1 Monitoring equipment can monitor up to 200 monitoring units (detectors)
2 can be connected with ARCM series monitoring detector
(5). 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, red light alarm signal should be maintained until manual reset
Monitoring alarm sound signal: can be manually eliminated, can be started again when there is alarm signal input again
(6). Fault alarm item:
1 The communication cable between the monitoring device and the detector is open or shorted.
2 Monitoring equipment main power supply undervoltage or power failure
3 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, 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
(7). Control output:
Alarm control output: 1 set of normally open passive contacts, capacity: AC250V 3A or DC30V 3A
(8). Self-test items:
1 Indicator check: alarm, fault, operation, main power, standby power indicator
2 display check
3 audio device inspection
Self-test time ≤60s
(9). Event record:
1 Record content: record type, time of occurrence, detector number, area, fault description, can store no less than 20,000 records
2 record query: query according to the date, type and other conditions of the record
(10). Operational rating:
1 Daily duty class: real-time status monitoring, event record query
2 Monitoring operation level: real-time status monitoring, event record query, detector remote reset, device self-test
3 System management level: real-time status monitoring, event record query, detector remote reset, device self-test, monitoring device system parameter query, monitoring device module detection, operator addition and deletion
(11). Environmental conditions for use:
1 Workplace: Fire control room, manned substation (distribution room), wall on room where someone is on duty
2 Working environment temperature: 0 ° C ~ 40 ° C
3 Working environment relative humidity: 5% ~ 95% RH
4 Altitude: ≤2500m
basic skills
(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 device lights up, the display indicates the alarm location and alarm type, and the alarm time is recorded. The sound and light alarm is always maintained. Until the display is reset by pressing the display "Reset" button. The audible alarm signal can also be manually removed using the display "Muffler" button.
(2). 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 device 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.
(3). Self-test function:
Check that all status indicators, display, and speakers in the device are normal.
(4). 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.
(5). 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.
(6). Detector control function:
Remote monitoring of all detectors connected to the unit is possible through monitoring software operation.
(7). Authority 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.
Since its operation, the system has operated well and played an important role in preventing electrical fires. It has gained recognition and trust from customers for products and companies.
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
Characteristics and Advantages
(1) Intelligent control design: adjustable main parameter and secondary parameter automatically according to the weight of door leaves;
(2) Low noise: Special static sound track, integration of motor, worm-gear and retarder.
(3) Anti-clamping function: automatically reverse when meeting barriers;
(4) Unique electronic motor lock: the motor will lock up when the door is forced to open.(controlled by remote or switch)
(5) Tighten force: seal door when closed, power consumption approximately 10W under standby;
(6) Advanced brushless motor(36V,100W) can automatically adopt different heavy door leaves;
(7) Bi-doors inter-locking: one of the door leaves always remains closing;
(8)Safety sensor terminal: sensor stops working when door closed;
(9)Unique coating technology: never rusty;
(10)Easy and convenient to install;
(11)Working Process: when the door leaf closes to the right place, the door leaf will slightly shift to the door frame and the ground. The rubbers on the four sides of the door leaf will completely combine with door frame and ground, which ensures air tightness. When the door is open, the rubbers will separate from door frame and ground, which avoids contraction on the ground.
Technical Specification
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Specification |
Light Duty |
Heavy Duty |
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Rang of the Door |
Single-Leaf |
Double-Leaf |
Single-Leaf |
Double-Leaf |
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Door leaf max weight |
100kg |
100kg x 2 |
200kg |
200kg x 2 |
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Mounting Method |
Surface mounting or built-in mounting |
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Open Width |
700-2000mm |
650-2000mm |
750-2000mm |
650-2000mm |
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Power Supply |
AC 220v ± 10%, 50-60 Hz |
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Opening Speed |
300-500mm/s (adjustable) |
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Closing Speed |
250-550mm/s (adjustable) |
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Creep speed |
30-100mm/s (adjustable) |
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Hold-open time |
0.5-20s (adjustable) |
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Airproof Force (Max.) |
>70N |
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Manual Pushing Force |
<100N |
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Electronic Lock Force |
>800N |
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Power consumption |
150W |
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Ambient temperature |
-20+50 C |
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Technical Details:
(1) Rubber lining sealing technology combined with V groove on the guide rail enables the door completely sealed when the door closed;
(2)Special door body location technology. Semicircular surface beam on the ground matches with the V style groove at the bottom of door leaf, which stop the door from swing and make sure it moves stable and smooth;
(3) The door body decorated with matte stainless steel or spray surface, and on the middle and both sides with sealing stripes to ensure the hermetic effect.
(4)Feet sensor switch applied to avoid contagion;
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