Application of Electrical Fire Monitoring System

In the past 10 years, the number of electrical fires in China has topped the total number of fire accidents. According to fire statistics of the Fire Bureau of the Ministry of Public Security, a total of 159,000 fires occurred in 2007 (not including forests, grasslands, military, underground mine fires, the same below). From the direct cause of the fire, electrical fires are the most common. Since then, it has accounted for 28.8% of the total. In 2008, there were 133,000 fires. Electrical causes such as electrical short circuits, overloads, and electrical equipment breakdowns caused 40,000 fires, accounting for 30.1% of the total. The proportion increased by 1.3 percentage points from 2007. The proportion of electrical fire accidents has increased year by year, which is worrying. For the severe electrical fire situation, early forecasting, early warning, and forecasting are the top priorities for firefighting, and eliminating the occurrence of electrical fires at the source has become the focus of attention. The task of preventing and effectively curbing electrical fires is imminent. Relevant state departments have successively formulated or revised relevant standards and specifications and required the installation of electrical fire monitoring and alarm systems in buildings.

Based on the new standard of electrical fire monitoring system (GB14827-2005) and the Leakage Fire Monitoring System of the Sixth Hospital Affiliated to Sun Yat-sen University in Guangzhou, this paper introduces the application of Acrel-6000 electrical fire monitoring system in hospitals and large public places.

1. Project Introduction

The Sixth Hospital Affiliated to Sun Yat-sen University is a comprehensive hospital that integrates medical treatment, teaching, scientific research, prevention, and rehabilitation and health care. This project is mainly for the south and north electric wells of the Sixth Hospital Affiliated Hospital of Sun Yat-sen University. The distribution circuit may forecast and monitor the fire due to leakage and leakage due to electrical leakage, accurately monitor the faults and abnormal conditions of the electrical circuit, and discover the fire hazards of the electrical fire. The timely alarm reminds the personnel to eliminate these hidden troubles. Helps hospitals save labor costs and eliminate potential fire safety hazards due to residual currents.

The system detects the leakage current, over-current, and over-temperature signals of each power circuit in the scene, and uses sound and light alarms to accurately alert the staff of the location of line faults and monitor the changes in the fault points. Storage of various fault and operation test signals, display system power status to effectively prevent common electrical fire accidents caused by electrical leakage, and ensure the safety of people's lives and property.

2, reference standards

The system complies with the People's Republic of China national standard GB14287.1-2005 "Electrical fire monitoring system - Part 1: Electrical fire monitoring equipment."

3, the basic composition and working principle of the system

3.1 The basic components

According to the national standard GB14287-2005 "Electrical Fire Monitoring System" and the related specification "Design Method of Electrical Fire Monitoring System", the basic composition of the electrical fire monitoring system shall include: electrical fire monitoring equipment, residual current electrical fire monitoring detectors and test Temperature-type electrical fire monitoring detectors and other three basic product categories. Among them, the residual current type electric fire monitoring detector is again composed of a monitoring detector and a residual current transformer (a pair of plug-in type and a closed type); the temperature-type electric fire monitoring detector consists of a monitoring detector and a temperature sensor Made up of.

The residual current type electric fire monitoring system adopts a hierarchical distributed structure and is composed of a station control layer, a network communication layer, and a field device layer. The system topology is shown in the following figure: Each electrical fire monitoring probe is connected to the communication server through a shielded twisted pair RS485 interface, using a MODBUS communication protocol bus type connection, and then enters the monitoring host through the Category 5 TCP/TP protocol.