An expert system for substation fault diagnosis and alarmprocessing

An expert system for substation fault diagnosis and alarm processing developed by the Electric Power Systems Laboratory of the National Technical University of Athens is presented. It is written in Turbo Prolog and is implemented on a personal computer. The system includes many characteristics of an expert system cell because it can be expanded easily by adding new information to its knowledge base or by changing the existing information. The basic idea behind this system is to provide a nonexpert with the necessary information and interaction in order to make a fault diagnosis through the substation alarms in a very friendly environment. The main task of the system is to replace the troubleshooting manuals of substation equipment and human expertise in substation fault diagnosis and alarm processing with a user-friendly computer environment and to take advantage of the user's accumulated experience to expand and modify the knowledge base of the expert system. The expert system can be connected directly to a PC-SCADA system through a simple software interface written in C for online data acquisition     

An expert system for distribution substation fault diagnosis and backup protection

Using Prolog, this paper presents an expert system for fault section diagnosis in a substation primary system, backup protection and fault finding in protective systems. The expert system is intended for use in distribution substations.     

A fault diagnosis expert system for distribution substations

This paper presents a practical expert system for the diagnosis of various faults which may occur in distribution substations. The backward inexact reasoning process is applied for the fault section estimation using the knowledge of topology, the operation rules of protective devices, heuristic knowledge of well-trained operators, and instantaneous alarms. In this paper, the overall structure, detailed knowledge-base and the efficiency of general methodology based on topology are discussed. The proposed system has been tested in a local control center in Korea as a part of an intelligent guidance system for the SCADA operators     

基于模糊推理的飞机电源系统故障诊断专家系统

在对某飞机电源系统整流装置进行频谱分析的基础上,通过选择特定的故障敏感特征频率点,定义了基于小波变换理论的"频带能量特征向量"。针对飞机电源系统实时故障诊断的要求和基于小波变换的故障特征提取方法的特点,设计了基于模糊推理的产生式规则专家系统,该系统利用已获得的各种故障的"频带能量特征向量"构造规则前提的权系数,并使用"模糊匹配"、"语义距离"等方法实现推理机制,使故障诊断在"一次性"推理中完成,经实验验证满足实时性、准确性的要求,该方法为飞机电源系统故障诊断专家系统由理论验证向实际应用的转化提供了可行性。     

实时故障诊断专家系统在空调中的应用

介绍了实时故障诊断专家系统在空调故障诊断中的应用 ,主程序采用面向对象语言VC + +编写 ,该系统能迅速指出故障原因及修复调整的办法 ,以指导检修人员提高检修效率。     

高压断路器机械故障诊断专家系统设计

针对高压断路器的操动机构故障信息能反映在线圈电流、机械振动和辅助触点位置信号中的特点,在分析各信号特征提取和利用专家系统实现故障诊断的优点的基础之上,提出一种多参数规则推理的故障诊断专家系统.首先阐述高压断路器的操作过程,并根据其操作特性提取隐含在线圈电流和机械振动信号的有效信息,找出特征参数与断路器状态的对应关系,接...     

故障诊断专家系统高速模糊推理的CPLD实现

根据传统模糊推理的原理.提出了一种利用复杂可编程逻辑器件(CPLD)实现故障诊断专家系统高速模糊推理的模块化设计方法.该方法根据ROM存储器函数变换原理,在同一ROM内实现多种数据和多种类型的模糊变换与运算,利用CPLD器件实现模糊推理过程的协调与控制;将CPLD实现的推理控制与协调机构根据通用性划分为多个子模块,利用通用模块组装的形式搭建整个推理过程.从而将传统的软件模糊推理过程用模块化的硬件实现.实验证实,该方法实现的模.糊推理过程设计简单.推理速度也明显高于传统的软件推理,特别适用于基于单片机、数字信号处理器(DSP)等小规模CPU所实现的专家系统模糊推理.     

多知识集成的高加系统故障诊断机制

对于复杂的高压加热器设备,现有的高加诊断系统在工程使用中很容易造成误诊和漏诊。为克服其不足,借助于多知识的运用和集成,建立了高加系统的故障树模型,给出了高压加热器的定性微分方程,并将故障树分析、故障矛盾检测和故障模糊模式识别这三种深知识有机地结合在一起,提出了基于多知识集成的高加系统故障诊断推理控制机制,从而提高了高加系统诊断推理的效率和故障诊断的准确性。     

电力变压器信息管理及故障诊断专家系统的研制

介绍了变压器故障诊断专家系统的情况,描述了所开发系统的TFDES结构、推理机制、实现方法及诊断管理的主要功能。现场测试表明:TFDES结构合理,推理正确,能有效诊断运行中变压器的内部故障。     

电能表自动检定流水线模糊故障诊断专家系统

针对电能表自动检定流水线故障特点,构建了以模糊推理为基础的故障诊断专家系统。给出了专家系统的结构,设计了以模糊关系矩阵为核心的知识库,构造了符合实际的征兆隶属函数,选用加权平均模型进行模糊推理,设定两级阈值对推理结果进行综合评判。诊断实例结果与实际情况相符,验证了该专家系统的有效性。     

利用CPLD实现故障诊断专家系统高速逻辑推理

专家系统的推理时间取决于问题的复杂程度,难以满足系统实时性要求,限制了其应用。对此,提出一种利用复杂可编程逻辑器件(CPLD)实现故障诊断专家系统高速推理的方法。详细分析了一般故障诊断专家系统推理过程;利用故障树的概念将专家知识转换为二值或多值推理,并用一般门电路,进而利用CPLD实现推理过程;将其应用于高压断路器故障诊断系统,代替原来的软件推理。经过实验验证,该方法实现的专家系统推理过程迅速,特别适用于基于单片机、数字信号处理器(DSP)等所实现的专家系统。     

专家系统在超高压水射流切割机故障诊断中的应用

介绍了一个用于超高压水射流切割机电气故障的专家诊断系统。它与水切割机控制系统通过信号联络线同步运行 ,能够实时、在线地检测和诊断步进电机的驱动电路。并以单片机8031为核心 ,采用产生式规则建立知识库 ,用广度优先搜索法进行向后推理 ,运用并行推理方式提高搜索速度。     

基于ARM的嵌入式故障诊断系统方案的研究

本文讨论基于ARM的嵌入式故障诊断系统的平台开发,重点研究系统的体系结构和软硬件的实现.该系统采用ARM芯片作为处理器,Flash芯片作为系统的存储介质,通用的串行总线作为计算机数据传输接口,以太网作为向上一层系统传送信息的媒介,CAN总线作为外部数据信号的接收端口.从嵌入式平台的特点和故障诊断系统的功能出发,提出了基于ARM内核的CPU和WinCE的嵌入式故障诊断系统的整体解决方案.     

机载电子设备故障诊断专家系统的设计与实现

针对航空机载电子设备故障知识日益膨胀导致的故障诊断系统效率低下、难以快速有效地进行电子装备维护的问题,提出了一种新的、基于专家系统的机载电子设备故障诊断系统。分析了专家系统的原理和结构,研究了一般产生式规则与模糊产生式规则相结合的知识表示方法及精确推理与模糊推理相结合、基于规则推理、案例推理、模型推理及混合推理的推理机制。以Delphi7．0和Oracle9i为开发环境,开发了该专家系统。系统能快速分析故障现象,列出可能的故障原因,输出故障报告,提供故障处理指导。研究表明,新系统具有更高的效率、并且诊断结论也更可靠、可维护性也更好,在实际的航空机务维护工作中取得了良好的效果。     

An expert system prototype for event diagnosis and real-timeoperation planning in power system control

A prototype system called EKA, which is an attempt to apply sophisticated knowledge-engineering methods to power systems, is described. EKA is based on an object-oriented model and model-based reasoning, including multiple ways to represent knowledge: rules, facts, methods, daemons, procedures, logic programs, etc. The EKA system consists of three separate but structurally similar systems: an operation planning system, an event analysis system, and a training simulator. As a development environment, hybrid software and a Lisp computer have been used. The tasks and methods involved are described with and without an expert system. The application environment and prototype implementation are outlined     

基于模糊推理的电网故障诊断专家系统的研究

针对电网故障的不确定性因素,采用多级模糊综合评判的推理机制,设计了模糊推理理论的专家系统,该机制通过专家系统判断信息的合理性和模糊综合评判的推理能力,结合故障信息和不确定性因素,得到最合理的故障情况.通过实际算例,验证了该方法的可行性.     

An expert system for XPLE cable deterioration diagnosis and life forecasting

The recent increase in the demand for power in urban areas has caused changes in the way power is supplied. Underground distribution systems have been introduced for convenience in urban areas and to prevent injuries in case of a crisis. As a result, many new types of power cables are being used. One type, XPLE cables (also called CV cables) have been rapidly taking the place of conventional cables such as OF or SL cables since the 1960s because of their relatively easy installation and maintainability. However, distribution cables used under severe environmental conditions deteriorate rapidly (due mainly to water treeing), and some cables experience insulation breakdown. Therefore, many diagnostic methods have been developed, though they have not been very effective. By combining methods, a high reliability can be achieved in comparison to the use of a single method. However, processing the data is difficult for on-site personnel, so many experts are required. But there is a lack of qualified experts, hence we have turned to the development of expert systems.     

三峡水力发电厂700MW水轮发电机故障诊断专家系统

三峡水力发电厂在我国电力系统中占有十分重要的地位。为提高三峡水轮发电机的安全运行水平、逐步实现优化检修,研制、开发了三峡水力发电厂发电机定子水冷状态监测及故障诊断专家系统。该系统是一个集在线实时、在线非实时和离线数据的采集与分析、状态监测、故障诊断、故障处理、故障统计分析于一体的多任务、多客户端、多信息处理、B-S结构的发电机定子水冷状态监测及故障诊断专家系统,已于2004年5月投入运行。实践表明:该系统的应用可显著地提高发电机的安全性和可靠性并为状态/优化检修提供科学的决策依据,降低发电成本,产生巨大的经济效益和社会效益。     

一种基于知识诊断的集成系统故障隔离测试

针对当前国内集成研发系统普遍缺乏专家诊断系统和可维护性技术资料带来的现场故障隔离困难问题,提出基于知识诊断进行集成系统故障隔离测试的思想。通过对测试参数均方差处理,蓄电池内阻测试电路设计以及初充电流估算和进一步实验,揭示了各测试结果与故障之间的关联度,验证了分析结论与实验结果的一致性。采取治疗性充电方法解决了某车载式电子通信集成系统自动掉电问题,并对故障产生的深层原因进行了解析。给出相关测试电路、测试结果以及分析方法和结论。     

继电保护故障信息系统中的故障分析专家系统的设计思路

针对继电保护故障信息系统中的故障分析专家系统,提出了其设计的指导思想,并分析了其功能结构.同时就故障分析专家系统中的核心部分知识表示的实现方法进行了比较,分析了几种具体的实现方法.