电力系统零序电流保护原理及基于单片机的实现方法研究【参考】.docVIP

摘 要 本文结合零序电流和单片机的各自优点，主在阐述和论证电力系统零序电流保护原理及基于单片机的实现。 由于微机具有优越存储能力，可以方便地得到保护需要的故障分量并准确地予以保持，这是模拟式保护装置难以达到的。同时微机的强大运算能力，可以实现一些以往模拟式保护装置无法实现的复杂保护动作特性、自适应性的定值或特性改变以及良好的自检功能。同常规继电保护相比，微机继电保护更加灵活和智能。微机继电保护已经成为继电保护发展的一支主流。 零序电流保护属于小接地电流系统的保护方式, 它利用系统发生故障时零序电流比正常运行时大的特点, 来实现有选择性地发出信号或瞬时切断主回路电源, 避免事故的发生。零序电流可以通过对称分量法求得，实际应用时可用电流互感器测得所需分量。 关键词： 微机继电保护，零序电流，单片机 Abstract In this paper, combined with the advantages of the zero-sequence current and microcontroller ,this design focuses on explain and demonstrate the power system zero-sequence current protection principles and microcontroller-based realization method. With Superior storage capacity, the microprocessor can easily get the protection needs of the fault component and accurately be maintained. This is the analog protection devices difficult to achieve. And with powerful computing capability of the microprocessor, you can achieve some complex protection action such as self-adaptive fixed value or features changed, as well as good self-check function which can not be achieved in the past, analog protection device .Compared with the conventional protection microprocessor protection is more flexible and intelligent. Microcomputer relay protection has become a mainstream of the relay development. Zero-sequence current protection is the protection of the small ground current system. It uses the characteristic of zero sequence current of the failure system bigger than normal operation. To achieve that send signal or instantaneous cut off the main circuit power supply selectively in order to avoid accidents. Zero sequence current can be obtained by symmetrical component method, It can be measured by the current transformer in practical applications. Keywords: microcomputer relay protection, zero-sequence current, microcontroller. 目 录 摘 要 1 Abstract 2 1 继电保护简介 7 1.1引 言 7 1.2 课题的研究背景和意义 7 1.4 微机继电保护的发展史 10 1.5 课题的研究现状