交流特高压变电站站用变保护技术方案

发布时间：2018-06-25 18:10

本文选题：特高压 + 站用变保护　；参考：《电力系统保护与控制》2014年24期

【摘要】：特高压交流变电站站用电系统通常采用2级降压的方式,2级串联变压器的主保护差动需引接110 kV和380 V侧的CT电流。在低压侧故障时,低压侧电流有几十千安培,而折算到高压侧仅几百安培,由于两侧电流数据相差较大,给站用变的CT选型及站用变保护的配置、原理、整定带来一些问题。通过研究"皖电东送"特高压工程的淮南变电站低压侧设备配置方案和接线方式,结合实际工程情况及设备参数,分析了特高压交流变电站站用变保护的特殊问题。提出采用一套保护装置中配置双套电流转换插件及两套差动保护、后备保护的技术方案,并建立动模系统验证了该原理方案的可行性。
[Abstract]:The main protection differential of UHV AC substation power station usually adopts two stage step-down mode and the main protection differential of the two-stage series transformer needs to lead to the CT current of 110kV and 380V side. In the low-voltage side fault, the low-voltage side current has tens of thousands of amperes, but the conversion to the high-voltage side is only a few hundred amperes. Due to the large difference in the data of the two sides of the current, the CT type selection for the station and the configuration and principle of the transformer protection for the station bring some problems. By studying the configuration scheme and connection mode of the low-voltage side equipment in Huainan substation, combining with the actual engineering situation and equipment parameters, the special problems of transformer protection for UHV AC substation are analyzed. In this paper, a technical scheme with two sets of current conversion plug-in and two sets of differential protection and backup protection in a set of protective devices is proposed, and the feasibility of the principle scheme is verified by establishing a dynamic model system.
【作者单位】：哈尔滨工业大学电气工程及自动化学院;西安科技大学电气与控制工程学院;许继集团;
【分类号】：TM63

【共引文献】