Yang Junjun
Ankerui Electric Co., Ltd. Shanghai Jiading
0 Overview
Henan Zhoukou Orthopedic Hospital is located in Zhoukou City, Henan Province, and is the largest orthopaedic hospital in southeastern Henan. The scope of monitoring of this project is a basement substation.
Zhoukou Orthopaedic Hospital has 18 ARCM200L-J8 residual current instruments installed in the distribution cabinet of the underground power distribution room. Each instrument is connected to 8 residual current transformers. The field instrument is connected to the Acrel-6000B wall-mounted electrical fire monitoring system of the control center 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 is GB50045-95 (2005 edition) "High-rise civil building design fire code", which stipulates in clause 9.5.1: high-rise building fire hazard, personnel intensive places should be set up a leakage fire alarm system.
1.2 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 national standard "Building electrical fire prevention requirements and testing methods" also clearly requires that "the residual current action protector that automatically cuts off the power or alarm should be set at the power input end".
1.4 The product of electrical fire monitoring system should 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"
1.5 Installation and operation of electrical fire monitoring system should meet GB13955-2005 "Residual current action protection device installation and operation"
1.6 The power supply of the electrical fire monitoring system shall meet the requirements of GB50052 "Design Specification for Power Supply and Distribution System"
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
The electrical fire project of Henan Zhoukou Orthopedic Hospital consists of electrical fire monitoring background, electrical fire detector and leakage current transformer.
The communication bus of this project is connected to two communication buses, which are respectively connected to the distribution outlets of the power distribution station and are connected to the corresponding buses. After the bus is connected hand in hand in a distribution box, it is connected to the wall-mounted background 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 Control 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. Mainly by system software and necessary hardware equipment. 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 basement control room.
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 ARCM200L-J8 series of residual electrical fire monitoring detectors.
The system structure topology is as follows:
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3 electrical fire equipment
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3.1 Main equipment parameters:
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 work 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 project
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 project
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
l 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 risk parameters such as residual current, conductor temperature, overcurrent and overvoltage 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".
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
The electrical fire monitoring system of Henan Zhoukou Orthopedic Hospital consists of electrical fire monitoring device Acrel-6000B and leakage fire detector ARCM200L-J8. 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-6000B 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. The application of Acrel-6000 electrical fire monitoring system in Zhoukou Orthopedic Hospital of Henan Province, real-time monitoring of the leakage of various electrical circuits on the site, sound and light alarm for loops with abnormal conditions, timely reminding on-site duty personnel to ensure the safety and reliability of power supply, 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 at Ankerui Electric Co., Ltd., contact number, mobile phone, QQ '
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