Indexing and Designing Deadbands for Industrial Alarm Signals

作     者：Wang, Zhen Bai, Xingzhen Wang, Jiandong Yang, Zijiang 

作者机构：Shandong Univ Sci & Technol Coll Elect Engn & Automat Qingdao 266510 Shandong Peoples R China 

出 版 物：《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》 (IEEE工业电子学汇刊)

年 卷 期：2019年第66卷第10期

页      面：8093-8103页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0804[工学-仪器科学与技术] 0811[工学-控制科学与工程] 

基　　金：National Natural Science Foundation of China Research Fund for the Taishan Scholar Project of Shandong Province of China Scientific and Technological Innovation Project of Shandong University of Science and Technology [SDKDYC180359] 

主　　题：Alarm systems computerized monitoring fault detection industrial plants power generation safety management supervisory control and data acquisition (SCADA) systems supervisory control 

摘      要：Alarm systems play critically important roles for the safe and efficient operation of industrial plants, but they often suffer from too many nuisance alarms. Deadbands are widely used in industrial alarm systems to reduce the number of nuisance alarms. This paper formulates an index to determine whether deadbands are suitable for removing nuisance alarms of an analog signal, and proposes a method to design the deadband width. First, the deadband index is defined from two metrics, namely, normalized alarm durations and normalized alarm deviations. If the index is larger than 45 degrees, as indicated by a hypothesis test, then nuisance alarms are associated with large/small normalized alarm durations/deviations, so that deadbands are suitable. Second, a design method is proposed to find an optimal deadband width, so as to achieve the best weighted balance between the time duration of nuisance alarms and the delay in detecting abnormal conditions. The proposed method is applicable to nonindependent and identically distributed (IID) signals, whereas available design methods are confined to IID signals. Industrial examples are provided to validate the deadband index and the design method.