基于模糊集理论的变压器微机差动保护新判据  

A New Micro computer Differential Protection Criterion of Transformer Based on Fuzzy Set Theory

作　　者：范文涛[1,2] 王广延[1,2] 

机构地区：[1]南京电力自动化研究院 [2]山东工业大学电力系

出　　处：《中国电机工程学报》1997年第6期403-407,共5页Proceedings of the CSEE

摘　　要：变压器是电力系统的主要设备之一，寻求一个可靠的判据，以保证在区内故障时，尤其是在匝间短路时具有较高的灵敏度；而在区外故障时能可靠的不动作，是多年来的课题。本文在分析已有变压器保护判据的基础上，应用模糊集理论，对原有标积制动原理差动保护的判据进行了改进。新判据根据运行中的规律，确定了模糊系数，并引入了相关系数，使得判据能同时适应双绕组、三绕组变压器，以及各种运行方式的要求。Transformers are one kind of the most important equipment of power systems. It has been for many years that researches have been carried on in order to find a reliable criterion. The criterion should be both sensitive when internal faults occur or inter turn faults occur and reliable when over zone faults occur. In this paper the fault component with scalar product braking criterion is analyzed. By introducing fuzzy set theory an advanced criterion is brought forth. It not only has fault component and scalar product braking but also has auto adaptive ability, fuzzy parameters and relative parameters. These parameters are determined by the runtime conditions. It is suitable for all kinds of working conditions of both bi winding transformers and tri winding transformers. A laboratory model was made in order to verify this criterion. Stationary tests turn out that it is as sensitive, reliable, and fast as designed. Its tripping time is less than 20ms when internal faults occur.

关 键 词：模糊集理论 微机 变压器保护 差动保护 

分 类 号：TM410.6[电气工程—电器] TP18[自动化与计算机技术—控制理论与控制工程]