变电站备自投动作条件分析及改进

发布时间：2018-07-17 03:01

【摘要】：备自投即备用电源自动投切装置,是变电站保护的重要组成部分,当变电站双电源线单条出现故障,或双母线单条出现失电的情况下,装置自动合闸母分开关,为母线提供备用电源,防止长时间母线停电,保证对用户的正常供电。在现今越来越重视供电可靠性的形势下,备自投的作用将越来越重要。以浙江富阳供电公司为背景,备自投的动作逻辑发展经历了几个过程,判定条件一改再改,但是仍然存在着这样或者那样的问题,本文通过对比几种备自投动作条件,通过实际的案例分析,来阐述备自投动作条件的设定应该根据变电站不同的接线方式、备用方式、负荷情况和所处的特殊系统运行方式等具体情况来设定差异化的整定判据,切勿千篇一律的采用单一方式盲目整定,否则,备自投将形同虚设,特别是很多供电单位采取了统一的标准,有时起到的效果却适得其反。本文通过案例分析,提出了备自投在内桥接线备进线方式、极小负荷情况下备分段开关方式以及存有小电源系统备桥开关三种不同运行方式下新的动作条件逻辑判据,为以后如何整定类似运行方式下的备自投提供借鉴。
[Abstract]:The automatic switching device of standby power supply, which is an important part of substation protection, is an important part of substation protection. When there is a fault in the single strip of double power supply line in a substation or a single bar of double busbar is out of power, the device automatically closes the bus switch. Provide backup power for busbar, prevent long-time power outages and ensure normal power supply to customers. Nowadays, more and more attention is paid to the reliability of power supply. Taking Zhejiang Fuyang Power supply Company as the background, the development of the operational logic of the preparation for automatic throwing has gone through several processes, and the judging conditions have been changed again and again, but there are still problems of one kind or another. In this paper, by comparing several kinds of operational conditions, Through the actual case analysis, it is expounded that the setting of the operation conditions of the standby automatic switch should be based on the different connection mode, the standby mode, the load situation and the operation mode of the special system in the substation to set up the differential setting criterion. Do not adopt a single way blindly set, otherwise, self-service will be virtual, especially many power supply units to adopt a unified standard, sometimes the effect is counterproductive. In this paper, through the case analysis, a new operation condition logic criterion is put forward under three different operation modes, that is, the on-line mode of the self-switched internal bridge connection, the piecewise switch mode under the minimal load condition and the three different operation modes of the standby bridge switch of the small power supply system. For the future how to set the similar operation mode under the self-investment to provide reference.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM762.1;TM63

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