Application of Acrel-6000 Electrical Fire Monitoring System in Luohe Forestry Science and Technology Center

Ankerui Qingqing

Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd. Jiangyin, Jiangsu 214405

Abstract Ankerui residual current electrical fire monitoring system conducts electrical fire monitoring of low voltage distribution systems in shopping malls, hotels, airports, banks, hospitals, and factories through ARCM residual current electrical fire monitoring devices or digital residual current transformers. . This article introduces the electrical fire monitoring system project of Luohe Forestry Science and Technology Promotion Center and focuses on the functions and significance of the Acrel-6000 electrical fire monitoring system.

Keywords: electrical fire detectors monitoring equipment forestry Ankerui

1 Introduction

Luohe City is located in the east of Jilin Province and is adjacent to Songhua Lake in Changbai Mountain West. It is located at 126°5'-127°56' east longitude and 43°09' north latitude. Covering an area of ​​6,429 square kilometers and a population of 470,000, it administers 2 townships, 8 towns, 6 streets, 2 provincial-level development zones, and 1 county-level economic development zone. With a total area of ​​455,600 hectares, the total forest stock of the Fenhe River is 28.49 million cubic meters, and the forest coverage rate is 58.5%. It is one of the key forest areas in Jilin Province.
Luohe Forestry Bureau was established in 1963. It has 67.63 million yuan in fixed assets and 5800 forestry employees, including 374 professional and technical personnel. The overall grassroots party organization 23, 1053 members. There are 56 enterprises and institutions, including 19 state-owned enterprise farms, 37 institutions and institutions, 19 government departments, 16 forestry stations, 1 property guidance center, and 1 timber inspection station. It is a county-level local forestry management department that integrates government, affairs, and enterprise functions.

2. System Requirements Analysis

Detection of leakage current, over current, over temperature and other signals, sound and light signal alarm, accurately report the fault line address, monitor the changes in the point of failure. Store various fault and operation test signals to show system power status.

3. Reference standards

In recent years, in order to increase the intensity of prevention and control of electrical fires, the state has successively formulated or revised a number of relevant standards and regulations, and strengthened the prevention of electrical fires. These are:

3.1 GB50045-95 (2005 edition) "High-rise Civil Building Design Fire Protection Code", which provisions in Article 9.5.1: high-rise buildings in the fire risk, personnel intensive and other places should be set up a leakage fire alarm system.

3.2 GB50016-2006 "Code for the Fire Protection of Building Design", in Clause 11.2.7 states that the following places should be provided with residual current action electrical fire monitoring system. These venues include various types of theaters, halls, warehouses, residential quarters, hospitals, shops, schools, and so on.

3.3 The relevant provisions of the national standard “Building electrical fire prevention requirements and detection methods” also explicitly require that “the residual current protection device that automatically cuts off the power supply or alarm should be installed at the power supply inlet end”.

3.4 Products of electrical fire monitoring system shall meet: GB14287.1-2005 "Electrical fire monitoring equipment", GB14287.2-2005 "residual current electrical fire monitoring detector", GB14287.3-2005 "temperature-type electrical fire monitoring detector".

3.5 The installation and operation of the electrical fire monitoring system shall meet GB13955-2005 "Installation and Operation of Residual Current Operation Protection Device".

3.6 The power supply for the electrical fire monitoring system shall meet the requirements of GB50052 "Design Specification for Power Supply and Distribution System".

3.7 The design of the electrical fire monitoring system shall meet the requirements of the "Design Method for Electrical Fire Monitoring Systems" (provisional regulations).

4. System composition

The electrical fire monitoring system of Luohe Forestry Extension Center consists of electrical fire monitoring equipment, electrical fire detectors and leakage current transformers.

The project communication bus accesses two communication buses. After the buses are handed in series in the power distribution room, they are connected to the wall-mounted background to form the major 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 shows leakage in real time. The above constitutes a set of stable and reliable electrical fire monitoring systems. The system network is divided into three layers:

1) Station control management

Station management The management personnel of the electrical fire monitoring system are the direct windows of human-computer interaction and the top part of the system. Mainly by the system software and necessary hardware devices, such as touch screen, UPS power supply and other components. The monitoring system software calculates, analyzes, and processes various types of data on the site, and responds to the on-site operations by means of graphics, digital display, sound, and indicator lights.

Monitoring host: used for data acquisition, processing and data forwarding. Provides data interfaces within or outside the system for system management, maintenance, and analysis.

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

Background monitoring equipment is set in the self-dimensional substation.
2) Network communication layer

Communication medium: The system mainly adopts shielded twisted pair, uses RS485 interface, MODBUS communication protocol to achieve real-time communication between the field device and the host computer.

3) Field device layer

The field device layer is a data acquisition terminal, mainly ARCM200L series of residual electrical fire monitoring detectors.

The system topology is as follows:

5. Electrical fire equipment

5.1 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 under voltage or power failure, maintain the monitoring equipment working time ≥ 4 hours

Work system:

24-hour work

communication method:

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

Monitoring capacity:

1 Monitoring equipment can monitor up to 200 monitoring units (detectors)

2 can be connected with ARCM series monitoring detector

Monitoring alarm items:

1 Residual current fault (leakage): Fault cell attributes (part, type)

2 Temperature alarm (over temperature): Fault cell attributes (part, type)

3 Current fault (overcurrent): Fault cell attributes (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 eliminated manually, when it is alarm signal input again, it can start again

Fault alarm item:

1 An open circuit or short circuit occurred in the communication cable between the monitoring equipment and the detector

2 Monitoring equipment main power supply undervoltage or power failure

3 An open circuit or short circuit occurred in the connection between the battery charger and the battery

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 maintained until troubleshooting

Fault alarm sound signal: Can be eliminated manually, when it is alarm signal input again, it can start again

During faults, normal operation of non-failed circuits is not affected

Control output:

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

Self-inspection project:

1 Indicator Check: Alarm, Fault, Operation, Main Power, Standby Power Indicator

2 display check

3 audio device inspection

Self-check time ≤60s

record:

1 Record content: record type, occurrence time, detector number, area, fault description, no less than 20,000 records can be stored

2 record query: according to the record of the date, type and other conditions

Operation rating:

1 daily shift: real-time status monitoring, event record query

2 monitoring operation level: real-time status monitoring, event record query, remote reset of the detector, device self-test

3 System management level: real-time status monitoring, event record query, remote reset of detector, device self-check, system parameter query of monitoring equipment, individual detection of each module of monitoring equipment, operator addition and deletion

Use environmental conditions:

1 Workplace: fire control room, manned power distribution (distribution room), on-call room walls

2 working environment temperature: 0 °C ~ 40 °C

3 working environment relative humidity: 5% to 95% RH

4 Altitude: ≤2500m

5.2 AKH-0.66L Digital Residual Current Transformer

The AKH-0.66L digital residual current transformer uses AC sampling technology to monitor the residual current of the distribution circuit in real time to prevent electrical fires and supports the standard MODBUS-RTU protocol to be connected to various standard systems. This product uses isolated DC 24V power supply. The product complies with the standard requirements of GB14287.2-2005 "Electrical fire monitoring system Part 2: Residual current electrical fire monitoring detector".

6. System function

6.1 Monitoring alarm function:

The monitoring equipment can receive the leakage and temperature information of multiple detectors. When the alarm sounds, an audible and visual alarm signal is emitted. At the same time, the red “alarm” indicator light on the equipment is on. The display indicates the alarm location and the type of alarm. The alarm time is recorded and the sound and light alarm is maintained. , until the display reset button remote reset the detector. The audible alarm signal can also be manually cancelled using the display “Mute” button.

6.2 Fault alarm function

Communication failure alarm: When a communication failure occurs between the monitoring device and any connected detector, the corresponding detector in the monitoring screen displays a fault prompt, and the yellow “fault” indicator on the device lights up, and a fault alarm sound is emitted. .

Power failure alarm: When the main power supply or backup power supply 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 cancel the alarm sound.

6.3 Self-test function

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

6.4 alarm record storage 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 methods for searching.

6.5 Power Function

When the main power supply has a power failure or undervoltage, the monitoring device can automatically switch to the standby power supply. When the main power supply resumes normal power supply, it automatically switches back to the main power supply, ensuring continuous and smooth operation of the monitoring device during the switchover process.

6.6 pair detector control function

By monitoring the software operation, remote reset control can be performed on all detectors connected to the device.

6.7 Access Control Function

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

7. Conclusion

With the development of smart buildings and the widespread use of electricity, people have become more aware of security awareness. The installation of leakage current fire system in public buildings is an inevitable trend of intelligent construction. The electrical fire system is conducive to discovering hidden dangers and dealing with safety hazards in a timely manner. It is of great significance to prevent fires from occurring. Since the system was put into operation, many hidden dangers have been discovered and rectified. This has provided a scientific basis for the project's fire management and has received favorable comments from customers.

The electrical fire monitoring system of the Luohe Forestry Promotion Center consists of an electrical fire monitoring device Acrel-6000/B and an electrical fire detector ARCM200. Acrel-6000 electrical fire monitoring system is an independent research and development by the company to receive the residual current electrical fire detectors and other field equipment signals to achieve the alarm, monitoring, control and management of the protected electrical circuit running on the computer's industrial level Hardware/software system.

references

[1]. Ren Chengcheng, Zhou Zhong. Principles and Application Guide for Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press, 2007. 4

[2].Zhou Zhong. Application of Power Meters in Energy Metering of Large-scale Public Buildings [J]. Modern Building Electronics 2010. 6

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