一起化工电气设备跳闸事故的剖析（Analysis of a chemical electrical equipment tripping accident）.doc

一起化工电气设备跳闸事故的剖析（Analysis of a chemical electrical equipment tripping accident） This paper contributed by loukangbiao. Pdf document may at the WAP end of the browsing experience poor. Suggest you select TXT, or download the source file to the machine view. Technical exchange Analysis of Chemical Electrical Equipment trip accident Wei Hua Luo Sichuan Meifeng (4 seven, R Limited by Share Ltd, Sichuan Deyang 618000) 1 after the accident In January 30, 2007 18:oo, a synthetic ammonia plant of a chemical plant conversion section of a furnace fan (10kV high voltage asynchronous motor trip), due to the special nature of the production process of synthetic ammonia chemical plant, was forced to an emergency stop device. After 3min, the ammonia plant of 10kV high voltage power distribution room II busbar power line switch tripping, lokV autorestart switching, lokV II bus from the 10kVI bus power supply. At the same time, the distribution of ammonia plant room II bus power line switch and section II bus accident accident, outlet switch bus line switch 3 switches are low voltage overcurrent action. Low voltage BZT switching, low voltage low voltage busbar by section II I bus power supply, all power bus accident. The trip after the accident, the accident causes immediately find the chemical enterprise instrument workshop and technical personnel. After several hours of work, the ammonia recovery of power supply. The conditions, autorestart microcomputer protection device sends a signal to disconnect the II bus power line switch, delay 0.1s, 10kV autorestart automatic closing switch. (left) caused by 0kVII bus TV two side outlet switch trip: check on 10kV II bus TV loop, no grounding and short-circuit point, good insulation, then TV voltage switching parallel device for examination, but the normal input voltage, output voltage phase, open circuit board device has been burned, and a short-circuit fault phenomenon, through comprehensive analysis, TV two side outlet switch tripping is