单片机实现的电力系统零序电流保护摘 要电力系统继电保护是保证电力系统安全稳定运行、限制电力系统大面积停电事故最基本和最有效的技术手段。根据接地短路时零序电流大小变化作为故障特征量，变压器接地方式、非全相运行、单相自动重合闸等因素对零序电流保护的运行产生重要的影响，必要时需要实行相应闭锁装置。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, 避开事故的发生。零序电流可以通过对称重量法求得，实际应用时可用电流互感器测得所需重量。本文结合零序电流和单片机的各自优点，阐述和论证电力系统零序电流保护原理以及基于单片机的实现。关键词：继电保护；零序电流；单片机；对称重量法AbstractPower system relay protection is to guarantee the safe and stable operation of power system and it is also the most basic and the most effective technological way to restrictions on a large scale power blackouts ． According to ground short circuit，Transformer grounding method the size changed of the zero sequence current as fault characteristics, transformer grounding method. The open-phase operation and single-phase automatic reclosing such as zero-sequence current protection of the operation have a major impact. When it's necessary, we need to adopt corresponding locking device.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 selective transient signal or cut off the main circuit power supply, 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.In this paper, combined with the advantages of the zero-sequence current and microcontroller ,this design focuses on explain and dem...
