Application of Acrel-6000/B electrical fire monitoring system in the second-phase home appliance central library project of Boxihua Electric-Ankerui Cui Tingyu

Ankerui Cui Tingyu

Jiangsu Ankerui Electric Manufacturing Co., Ltd.

Abstract: This article 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 its application. Finally, through the introduction of Ankerui residual current electrical fire monitoring system in the second-phase home appliance central library project of Boshihua Electric, the realization of the electrical fire monitoring system and its important significance are explained.

Keywords: electrical fire; monitoring system; Acrel-6000/B; factory

0 overview

The second-phase home appliance center library of Boxihua Electric is located in the east of Hangzhou Road, west of Huizhou Road, south of Century Avenue, and north of Changjiang Road in Chengdong Industrial Park, Chuzhou Economic and Technological Development Zone. The project covers an area of ​​120 mu with a total The building area is 75600m2, and the main construction content is a 13-meter-high production plant, which includes a raw material warehouse, sheet metal processing area, door seal production area, powder spraying workshop, foaming area, extrusion area, molding area, injection molding area, Assembly area, packaging area and staff public rest and dressing area; at the same time, the project will build a single-story dangerous goods warehouse with an area of ​​600m2. There are 6 main production lines in the production plant of this project, which will be constructed in 2 phases. Each phase will build 3 production lines with a capacity of 1.15 million refrigerators per phase. After the project is completed, the annual output will be 2.3 million refrigerators.

This project is mainly responsible for monitoring the leakage status of the low-voltage power distribution cabinets distributed on the floor at the site, and promptly reminding the personnel on duty in the elimination and control room to prevent electrical fires.

There are 176 ARCM300 residual current meters installed in the floor distribution box on the site of the second-phase home appliance center warehouse of Boshihua Electric. The field instrument is connected to Acrel-6000/B 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 related standards and specifications to strengthen the prevention of electrical fires. There are:

1.1.GB50045-95 (2005 Edition) "Code for Fire Protection Design of High-Rise Civil Buildings", which stipulates in Article 9.5.1: In high-rise buildings, places with high fire hazard and crowded people should be equipped with leakage fire alarm systems.

1.2. GB50016-2014 "Code for Fire Protection Design of Buildings" stipulates in Article 11.2.7: Residual current operated electrical fire monitoring systems should be installed in the following places. These places include various types of theaters, venues, warehouses, residential areas, hospitals, shops, schools, and so on.

1.3. The relevant provisions of the national standard "Building electrical fire prevention requirements and detection methods" also clearly require that "residual current-operated protectors that automatically cut off the power supply or alarm should be installed at the power inlet end."

1.4. The products of the electrical fire monitoring system should meet: GB14287.1-2014 "Electrical Fire Monitoring Equipment", GB14287.2-2014 "Residual Current Type Electrical Fire Monitoring Detector", GB14287.3-2014 "Temperature Measuring Type Electrical Fire Monitoring Detector》

1.5. The installation and operation of the electrical fire monitoring system should meet 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 "Code for Design of Power Supply and Distribution System"

1.7. The design of the electrical fire monitoring system should meet the requirements of the "Design Method of Electrical Fire Monitoring System" (temporary regulations)

2 System composition

The electrical fire system project of the second-phase home appliance central library of Boshihua Electric consists of an electrical fire monitoring background, an electrical fire detector and a leakage current transformer.

The communication bus of this project is connected to 2 communication buses. After the bus is connected in series in the power distribution room, it is connected to the wall-mounted background to form the main artery of the electrical fire system. The leakage current transformer in the box is connected to the leakage detector through the current line, and the leakage detector displays the leakage situation in real time. The above constitutes a set of electrical fire monitoring system with stable signal and reliable accuracy. The system network is divided into three layers:

2.1 Station control management

The station control management layer is the direct window of human-computer interaction for the management personnel of the electrical fire monitoring system, and is also the top part of the system. It is mainly composed of system software and necessary hardware equipment, such as touch screen, UPS power supply, etc. The monitoring system software calculates, analyzes, and processes all kinds of data information on site, and reflects the on-site operation conditions with graphics, digital display, sound, and indicator lights.

Monitoring host: used for data collection, processing and data forwarding. Provide data interfaces inside or outside the system for system management, maintenance and analysis.

UPS: Ensure the normal power supply of the computer monitoring system, and ensure the normal operation of the station control management layer equipment when the power supply problem occurs in the entire system.

The background monitoring equipment is set in the elimination room.

2.2 Network communication layer

Communication medium: The system mainly uses shielded twisted-pair wires, RS485 interface, MODBUS communication protocol to realize real-time communication between field equipment and host computer.

2.3 Field device layer

The topological diagram of the system structure is as follows:

3. Electrical fire equipment

3.1. Acrel-6000 electrical fire monitoring background:

The main technical parameters

power supply:

① Rated working voltage AC220V (-15% ～ +10%)

② Standby power supply: when the main power supply is undervoltage or power failure, the working time of the monitoring equipment is ≥4 hours

Working system:

24-hour working system

communication method:

RS485 bus communication, Modbus-RTU communication protocol, transmission distance 1km, can extend the communication transmission distance through repeater

Monitoring capacity:

â‘  The monitoring equipment can monitor up to 200 monitoring units (detectors)

â‘¡ It can be connected with ARCM series monitoring detector

Monitoring alarm items:

â‘  Residual current fault (leakage): attributes of the faulted unit (location, type)

â‘¡ Temperature alarm (over temperature): the attributes of the faulty unit (location, type)

â‘¢ Current fault (overcurrent): fault unit attributes (location, 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: it can be manually eliminated, and it can be restarted when there is an alarm signal input again

Fault alarm items:

â‘  The communication cable between the monitoring equipment and the detector is open or short-circuited

â‘¡ The main power supply of the monitoring equipment is undervoltage or power failure

â‘¢ The connection line between the charger and the battery for charging the battery is open or short-circuited

Failure alarm response time: ≤100s

Monitoring alarm sound pressure level (A weighting): ≥70dB/1m

Monitor and alarm light display: yellow LED indicator, yellow light alarm signal should be maintained until the fault is eliminated

Fault alarm sound signal: can be manually eliminated, when there is an alarm signal input again, it can be restarted

During the fault, the normal operation of the non-faulty circuit is not affected

Control output:

Alarm control output: 1 set of normally open passive contacts, capacity: AC250V 3A or DC30V 3A

Self-check items:

â‘  Indicator light check: alarm, fault, operation, main power, standby power indicator

â‘¡ Screen check

â‘¢ Audio device inspection

Self-test time ≤60s

record:

â‘  Record content: record type, occurrence time, detector number, area, fault description, can store no less than 20,000 records

â‘¡ Record query: query according to conditions such as date and type of record

Operation level:

â‘  Daily duty class: real-time status monitoring, event record query

â‘¡ Monitoring operation level: real-time status monitoring, event record query, detector remote reset, equipment self-check

â‘¢ System management level: real-time status monitoring, event record query, detector remote reset, equipment self-check, monitoring equipment system parameter query, individual monitoring equipment modules, operator addition and deletion

Environmental conditions for use:

â‘  Workplace: Fire control room, manned substation (distribution room), on the wall in manned room

② Working environment temperature: 0℃～40℃

③ Relative humidity of working environment: 5%～95%RH

④ Altitude: ≤2500m

3.2, ARCM200L series instrument

The ARCM200L residual current electrical fire monitoring detector is designed for TT and TN systems below 0.4kV. It monitors and manages the residual current, wire temperature, overcurrent, overvoltage and other fire risk parameters of the distribution circuit. Thereby preventing electrical fires, real-time monitoring of a variety of power parameters, and providing accurate data for energy consumption management. The product adopts advanced microcontroller technology, high integration, small size, easy installation, intelligent, digital, and networked. It is an ideal choice for building electrical fire prevention and monitoring, and system insulation aging prediction. The product meets 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 send out an audible and visual alarm signal when alarming. At the same time, the red "alarm" indicator on the device is on, the display screen indicates the alarm location and the type of alarm, and the alarm time is recorded. , Until you press the “reset” button on the display to remotely reset the detector. The audible alarm signal can also be manually eliminated by using the "Mute" button on the display.

4.2. 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 will display a failure prompt, and the yellow "fault" indicator on the device will be on and a failure alarm will sound .

Power failure alarm: When the main power supply or backup power supply fails, the monitoring equipment will also send out an audible and visual alarm signal and display the fault information. You can enter the corresponding interface to view the detailed information and cancel the alarm sound.

4.3. Self-check function

Check whether all status indicators, display screens, and speakers in the device are normal.

4.4. Alarm record storage and query function

When leakage, over-temperature alarm or communication or power failure occurs, the alarm location, fault information, alarm time and other information are stored in the database. When the alarm is removed and the fault is eliminated, it is also recorded. Historical data provides a variety of convenient and fast query methods.

4.5. Power function

When the main power supply fails, undervoltage and other faults, the monitoring equipment can automatically switch to the standby power supply. When the main power supply returns to normal power supply, it will automatically switch back to the main power supply. The continuous and stable operation of the monitoring equipment is guaranteed during the switching process.

4.6. Control function of detector

Through the operation of monitoring software, remote reset control of all detectors connected to this equipment can be carried out.

4.7. Access control function

In order to ensure the safe operation of the monitoring system, the operating authority of the monitoring equipment software is divided into three levels, and operators of different levels have different operating authority.

5 Conclusion

The electrical fire project of the second-phase home appliance central library of Boshihua Electric is composed of electrical fire monitoring device Acrel-6000/B and leakage fire detector ARCM300. Acrel-6000 electrical fire monitoring system is an industrial-grade computer-developed system independently developed by the company for receiving signals from field equipment such as residual current electrical fire detectors to achieve alarm, monitoring, control, and management of protected electrical circuits. Hardware/software system. This system is used in fire control centers in large shopping malls, living quarters, production bases, office buildings, shopping malls and hotels, etc., to remotely measure, remotely adjust, remotely control and remotely signal the detectors scattered in the building to facilitate monitoring and management. This system uses standard Modbus field bus to connect detectors with communication function. When the detected parameters in the field protection circuit exceed the alarm setting value, it can send out alarm signals and control signals, indicate the alarm position and save the alarm information. The field instrument is connected to Acrel-6000/B wall-mounted electrical fire monitoring system of the control center by bus. This system has the advantages of convenient installation and transportation, high cost performance, and convenient maintenance.

references

[1]. Ren Zhicheng Zhouzhong. Principle and Application Guide of Digital Instruments for Electric Power Measurement[M]. Beijing. China Electric Power Press. 2007. 4

[2]. "General Technical Requirements for Fire Control Room". Beijing. China Standards Press. 2011. 7

[3]. "Installation and Operation of Residual Current Action Protection Device". Beijing. China Standard Press. 2005

[4]. Zhou Zhong. The application of electric power meters in the electric energy sub-metering of large public buildings[J]. Modern Building Electric 2010. 6

About the author: Cui Tingyu, male, undergraduate, Jiangsu Ankerui Electric Manufacturing Co., Ltd., whose main research direction is intelligent building power supply and distribution monitoring system. Email: el.cn QQ: 2881068608 Mobile: 18860995251 Tel: 0510-86179851 Fax: 0510-86179975 Website: http://