Insufficient tightening of wire joints in air-conditioned passenger cars

　　With the rapid development of China’s railway passenger transport industry, new types of centralized power supply and fully air-conditioned passenger trains are gradually replacing old-type passenger trains, and have now become the main body of all-track inter-office direct passenger trains. In recent years, fire accidents and dangers caused by the electrical system of air-conditioned passenger trains have occurred frequently, and the vehicle department has also discovered a large number of electrical fire hazards in the maintenance and operation of air-conditioned passenger cars. Fire accidents, dangers, and hidden dangers have brought many adverse effects on the normal transportation and production of railways. How to grasp the regularity of electrical fires in air-conditioned passenger cars and improve the ability to prevent and control passenger car fires has become the focus, difficulty and key point of current passenger car fire safety. The author talks about some superficial views on this. The main reason for the frequent occurrence of electric fire hazards in air-conditioned passenger cars: the diversity of voltage systems, electricity consumption and power generation in air-conditioned passenger cars greatly increases the probability of electric fire hazards. Ordinary 22 type non-air-conditioned passenger cars have simple electrical systems, as well as lighting fixtures, air-conditioning systems, electric tea stoves, video broadcasts, warm water tanks, electronic display screens, axle temperature alarms, refrigerators, dining car exhaust fans and other electrical facilities and electrical loads Large, there are many electrical connection points. Single-section air-conditioned passenger cars are powered by their own diesel generator sets; most of the entire train of air-conditioned passenger cars are powered by generator cars, with two main transmission lines, which are AC three-phase four-wire power supply systems. The application of complex transmission and distribution systems and a large number of electrical facilities and equipment has increased the probability of failures. Some air-conditioned passenger cars are not in place in accordance with regulations and standards when they are newly built and repaired, leaving a hidden fire hazard. First of all, through analysis of the causes of air-conditioned passenger car fires and fire insurance cases that have occurred throughout the road in recent years, it is found that there are many problems such as electrical equipment failures and poor insulation of air-conditioned passenger cars due to low quality of new construction and factory repairs, and they are extremely harmful. Specifically, the laying of electrical lines did not meet the requirements of the Ministry of Railways “Railway Passenger Car Wiring Rules”. Some newly-built air-conditioned passenger cars have problems such as insufficient tightening of wire joints, different circuits on the top of the passenger car, and wires of different voltage levels are bundled together, and no protective wire sleeves are added, and the power line length margin is too large.

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