Application and design of electrical fire monitoring system

0 Preface
With the development of the national economy and the improvement of people's living standards, the electricity consumption of industrial electricity and households has increased year by year, which has brought great convenience to people's life and production, and also left security risks. In recent years, electrical fires have been at the forefront of fires. In view of the severe situation of high electrical fire accidents in recent years, according to the rules and characteristics of electrical fires, this paper proposes to promote the application of electrical fire monitoring system technology, improve the ability to prevent and control electrical fires, and achieve the purpose of preventing problems before they occur.
1 Analysis of the cause of electrical leakage fire
According to statistics, short-circuit fires account for 60% of electrical fires, which is the most common electrical fire. When the power supply line and equipment are improperly installed, the line is aging or mechanically damaged, the insulation is degraded, and an abnormal current flows between the power supply line and the equipment and the earth, and leakage occurs. When the human body touches the fault voltage, it may cause an electric shock. If the insulation is damaged, a ground fault may occur and an electrical fire may occur. The ground fault is a short circuit between the live conductor and the ground. When the electrical circuit and the device have a ground fault due to insulation damage, the arc and spark will be caused at the leakage fault point and the poor conductive connection. The arc has a large impedance and voltage drop, which limits the limitation. The fault current makes the current protector unable to operate or can not act in time to cut off the power supply. The local high temperature generated by the leakage arc of several hundred milliamperes is above 2000 °C, which is enough to ignite the surrounding combustibles and cause electrical fire. However, the existing fire protection technical regulations have fewer restrictions on electrical fire prevention, and insufficient supervision and management, resulting in many hidden dangers in the electrical design, construction and use of a large number of users.
2 Basic composition, working principle and design of electrical fire monitoring system
(1) Basic composition and working principle
The basic components of the electrical fire monitoring system: electrical fire monitoring equipment, residual current electrical fire monitoring detectors and temperature-type electrical fire monitoring detectors and other three components.
The electrical fire monitoring system integrates monitoring, alarming, control, and centralized management. The monitoring detector is generally attached to the branch on the bus, accepts the command of the main controller, and transmits all the information; the main controller processes the received data. Monitor changes in parameters such as leakage current and temperature of the detected electrical circuit. When the parameter is abnormal, the terminal probe such as residual current transformer and temperature sensor collects the information and sends it to the monitoring detector. When the set value is exceeded, an alarm signal is sent and sent to the monitoring device. After further judgment, when When it is confirmed that an electrical fire may occur, the monitoring host issues a fire alarm signal, the alarm indicator lights up, an alarm sound is emitted, and an alarm message is displayed on the liquid crystal display, and the on-duty personnel promptly perform inspection and processing.
(2) Design of electrical fire monitoring system
Le Bird's electrical fire monitoring system (also known as leakage fire alarm system) series products can monitor, alarm and record the electrical faults such as excess current, short circuit, over temperature and fault arc of the power distribution system. At the same time, the product has superior anti-electromagnetic interference measures and large-capacity information storage. The system consists of a terminal APP, cloud server, electrical fire monitoring equipment, multiple electrical fire monitoring detectors and multiple electrical fire monitoring probes to form a large-scale monitoring system to form a multi-unit, high-performance electrical fire monitoring system. Through the electrical fire monitoring equipment, it is convenient to realize remote monitoring of the electrical fire monitoring detector, and conveniently perform real-time data, historical data query and parameter modification on any electrical fire monitoring detector, and the APP through the terminal can be used anytime and anywhere. Monitor electricity safety. The system electrical and electrical fire monitoring equipment and electrical fire monitoring detectors use high-performance CAN bus connection, terminal APP and electrical fire monitoring equipment use internet connection, so that the data communication direction is not limited, and the electrical response can be reflected in the first time. The real-time status of the fire monitoring detector. The system interface is intuitive, easy to use, and can be used correctly even without any computer-based management personnel.

The electrical fire monitoring system is a real-time monitoring and control of the use of electricity. Improper use of electricity or faults in the line may lead to fires. The electrical fire monitoring system solves the fire safety problem caused by electricity and monitors the electricity in real time. Its main system functions are:
●Alarm the fault residual current, fault over current, fault over voltage, temperature, fault arc 1
●Remaining current 55-1000mA step 1mA, temperature 55 - 150°C step 1°C
● System read, save and automatic clear
● Response time < 5s, fault sound alarm > 80db
●Alarm record, event record, fault record
●Alarm record, fault record, etc.
● Real-time monitoring of fault residual current, fault overcurrent, fault overvoltage, temperature, fault arc of each power supply line of the system
● The system automatically detects faults and periodically checks for faults in its own peripherals.
●Can be connected with the fire control room graphic display device, fire automatic alarm device, distribution automation system
●Graphic display, report production, user management, remote control of distribution point, use APP monitoring through internet
●Industrial control machine UPS is ready for backup, with automatic switching between main and standby power
● Universal professional interface, network connection with the total database
● Fault indicator, alarm status indication, silence indicator
●LN6 detector to LN6H electrical fire monitoring equipment uses CAN-bus, MODBUS-RTU protocol, LN6H electrical fire equipment to the cloud server to use the internet
●LN6H can be remotely monitored via mobile app or PC software

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