大学毕业设计论文-中性点直接接地电网零序保护继装置设计.doc

学号： 常 州 大 学 毕业设计（论文） （2012届） 题 目 学 生 学 院 专业班级 校内指导教师 专业技术职务 校外指导老师 专业技术职务 二○ 中性点直接接地电网零序保护继装置设计 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是基本和最有效的技术手段。零序电流保护广泛地作为电力系统接地短路的保护，根据接地短路时零序电流的出现和大小作为故障特征量，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，必要时需要采取相应闭锁装置。 本设计根据继电保护装置在电力系统中的应用，介绍6KV到10KV电网继电保护的零序电流保护的整定设计。 设计过程如下，首先对电力系统网络的参数进行计算，绘制出各序序网图，然后选择合理的运行方式，计算各母线发生各种金属性短路故障时通过线路保护装置的短路电流，根据所得数据及所选的运行方式选择最佳的配合保护，并对各保护进行分析和整定计算，确定零序电流保护的整定值以及三相重合闸装置选型。 关键词：闭锁装置，零序电流保护，继电保护 Designning of the zero-sequence protection device neutral-point solid ground system Abstract Power system protection is to ensure safe and stable operation of power systems, limit the power system blackout is the basic and most effective techniques. Zero sequence current protection is widely used as short-circuit protection of power system grounding, according to the appearance and size of the zero-sequence current is shorted to ground as the fault characteristic transformer grounding method, non-phase running, single-phase auto-reclosing and other factors on the zero-sequence current the operation of protection have an important impact, if necessary, take appropriate locking device. This design is based on the protection devices in the power system, introduced 6KV to 10KV relay protection setting of the zero sequence current protection design. The design process is as follows, first of all to calculate the parameters of the power system network, to map out the sequence Sequence Network, and then select run, when calculating each bus metallic short-circuit fault occurs through the short-circuit current of the circuit protection device, based on the data and selected operati