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DF3382E备用电源自动投入装置及其在电力自动化系统中的应用
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摘要
随着电子技术的高速发展,电力系统自动化也得到了飞速发展,电力系统的规模在不断扩大,系统的运行方式也越来越复杂,用户对备用电源自动投入装置提出了更高的要求,每个变电站的备自投动作逻辑更加复杂。本文研究了备自投装置在电力系统中的具体应用,可编程逻辑的运算规则,编写规则和解析机制。将可编程逻辑运用到备自投的软件设计中,改进了装置的灵活性,可靠性,可以非常方便地满足用户的需求。
     本文首先介绍了该备用电源自动投入装置的硬件设计,该设计采用了功能模块化的设计思想,这样有利于提高装置硬件的通用性,即不同功能的装置可以由相同的各功能组件按需要组合配置,实现了功能模块的标准化。该装置由CPU插件、交流插件、电源插件、出口插件和人机对话板构成。
     在装置的软件设计方面,采用可编程逻辑方程实现备自投的动作逻辑,程序底层只作输入继电器字,输出继电器字,时间继电器计时的处理和逻辑方程的解释。与动作有关的过程全部放在逻辑方程中执行,使得装置的可靠性更高,维护和逻辑的更改更方便。
     该装置适用于分段备自投、变压器备自投和进线互投方案,并可根据用户的不同要求灵活定制动作方案。通过测量进线和母线的电压值、电流值,判断当前的运行状态,根据设定的功能要求完成两组或多组进线的自动投切,即备自投功能。而且,该装置还具有分段断路器的过流保护功能,母充保护功能,过负荷联切功能以及PT断线监测功能等。
     同时,为了让装置适应恶劣的现场环境,对装置采取了硬件抗干扰措施和软件抗干扰措施,提高了装置的可靠性。通过对该装置一年内现场运行情况分析可知,该装置可以灵活、安全、可靠地运行于电力自动化系统中。
Automation of Electric Systems is quickly developed with the rapidly development of Technology of Electronics. The scale of power system expands continuously, and method of operation becomes more complex in every power station. Then the users need higher requestments for alternate power auto-cast device, so the logic action of spare power automatic switching gets more complex. This paper discusses the application of alternate power auto-cast device in power system. And then introduces the operation rules, writing rules and analying rules of programmable logic equations. The flexibility and reliability of alternate power auto-cast device can be improved, and the requirements of users can be satisfied conveniently by the application of programmable logic equations in the software design.
     First, this paper introduces the hardware design of the device.The function modularization method is used in the design to improve generalization of hardware. Then the devices with different functions can be assembled by the same functional module as required, and the functional module of standarditation is realized. This device includes CPU plug-in board, AC plug-in board, Power plug-in board, Trip plug-in board and HMI.
     Second, the paper introduces the software design. The prommgrammable logic equation is applied to achieve logic action of spare power automatic switching. The application programme controls input relay word, output relay word, time relay and explain logic equation. So the device is more reliable, the maintain of device and the change of logic equation are convenient.
     The device can be used in subsection alternate power auto-cast method, transformer alternate power auto-cast method and in-wire alternate power auto-cast method, besides, the device also can be design for the users with different methods. It can determine the running state by measuring the voltage and current of in-wire and bus and then gets to alternate power auto-cast function. Moreover, there are overcurrent protection, bus charging protection, over load linkage function and PT broken monitoring function etc. of subsection breaker in the device.
     There are hardware and software design against interferences to improve the reliability. The device can be used in the power system flexible, safely and reliably by the site operation results.
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