船舶选择性微机漏电保护系统

Microcomputer-based selective leakage protection system of marine electric power system

漏电保护对保证船舶安全具有重要作用,大型船舶由于结构复杂,其漏电保护系统还需要具有选择性,所以必须对零序电流保护的电容电流进行补偿。提出了基于支路π形等效的时域补偿方法,仿真结果表明,与常规的稳态补偿相比,时域补偿会有更好的保护效果。在此基础上,研究了漏电保护在微机中的实现,介绍了软硬件的实现方案,具有较广的应用前景。

Leakage protection plays an important role in protecting the marine. Due to the complexity structure of marine electric power system, selectivity is necessary for today＇s leakage protection, and the compensation of capacitive current is essential for zero-sequence current protection. This paper presents a new time domain compensate method based on π-equivalent of line. The simulation results show that comparing with the general state compensate method, the new method is more effective. Based on the time domain compensate method, this paper discusses the realization of microcomputer-based leakage protection and presents the scheme of hardware and software. The new scheme can be used to constitute a selective leakage protect system in marine electric power system.