PLC在变电所自动装置中的应用.docVIP

毕业设计说明书 PLC在变电所自动 装置中的应用 PLC在变电所自动装置中的应用 摘要：随着计算机在社会领域的渗透，PLC的技术正在不断地走向深入，同时带动传统控制检测日新月益更新。本论文基于在实时检测和自动控制的PLC应用系统中，PLC往往是作为一个核心部件来使用，仅PLC方面知识是不够的，还应根据具体硬件结构，以及针对具体应用对象特点的软件结合，以作完善。通常情况下，为了保证正常供电，在冶金、化工、铁路牵引等对供电可靠性要求较高的用户，均采用双路供电方式，当一路电源失压或变压器发生故障时，便投入备用电源。电力系统架空线路上的短路故障大多数是“瞬时性”的。对于这类瞬时性故障而跳闸的线路，如能在故障消失后迅速恢复送电，则可大大提高供电的可靠性。为此，在线路中采用了自动重合闸，当断路器跳闸后，能够自动将断路器重新合闸。本文介绍了以PLC为核心，对某变电所的备用电源自动投入装置及自动成合闸进行了控制的应用，简述了PLC的性能特点，详细阐述了备用电源自动投入装置和自动重合闸的实现。关键词：PLC；备用电源自动投入；自动重合闸 PLC in Substation Sutomatic Device in Application Abstract：along with computer penetration in the social sphere, PLC technology is constantly deepening, led the traditional control test at the same time ever updated. This paper based on PLC in domestic and foreign steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automotive, and various areas of need, to solve a lot of problems. System settings, high reliability, strong anti interference capability.In real-time detection and automatic control of PLC application, PLC is often used as a core component, only the PLC knowledge is not enough, should be based on specific hardware structure, and the specific characteristics of the target application software, to make perfect.Typically, in order to ensure the normal power supply, in the metallurgical, chemical, railway traction on the power supply reliability requirements for higher user, adopt dual power supply mode, when a power loss of pressure or transformer fault, throws a standby power supply.Power system short circuit fault on the overhead line most is instantaneous. For this type of transient fault and tripping circuit, if the fault disappears rapidly after restoring power supply, can greatly improve the reliability of power supply. Therefore, in line with automatic reclosing, when the tripping of the circuit breaker, breaker to switch to automatically.The article introduced to the PLC as the core, of an electric substation standby power automatic input device and aut