Types of faults like short circuit condition in power system network results in severe economic losses and reduces the reliability of the electrical system. Pdf trends in fault diagnosis for electrical machines. Intelligent system design for stator windings faults. These principles apply in all disciplines regardless of whether they are civil, electrical, mechanical etc. Remove any corrosion on battery terminals with bicarbonate of soda. Hi, i have a fault finding test soon and need some advice on the sequence of tests to carry out. Abstract the ability to monitor the condition of an electrical machine has been a concern of industry for many years. An electrical maintenance engineer is responsible for planning the maintenance to ensure the smooth running of production lines in a company.
The rotor faults were provoked interrupting the rotor bars by drilling into the rotor. Principles of systematic fault diagnosis diagnosis of faults requires a logical and disciplined approach. This skills workshop covers the main service faults, dealing with refrigeration system faults as well as electrical faults where the one. Electrical powers system is growing in size and complexity in all sectors such as generation, transmission, distribution and load systems.
Electrical fault finding melbourne tips electricians today. Types of faults and effects in electrical power systems. Mem18048b fault find and repairrectify basic electrical circuits modification history not applicable unit descriptor unit descriptor this unit covers locating and repairing and rectifying faults in noninterconnected electrical circuits. Although some equipment faults are immediate, the majority of failures that influence production are the result of the poor execution or lack of a maintenance program. Carrying out fault location on electrical equipment and. Feel free to use the past paper as you prepare for your upcoming examinations.
Osburn bureau of reclamation hydroelectric research and technical services group denver, colorado 5f. Reducing maintenance costs and preventing unscheduled downtimes, which result in losses of production and financial incomes, are the priorities of electrical drives manufacturers and operators. During the course of assessing more than candidates over a 15 year period, mcp has found fault finding to be the second biggest weakness in maintenance trade tests. The laboratory supervisor must be consulted for advice about who is to carry out the repairs.
A university of science and technology faridabad121006 haryana, india. Where electrical faults can begin end turns of windings. On stranded cable, if ends are corroded, cut off ends or separate strands and clean internally. Electrical equipment and apparatus must be maintained in good working order.
An expert system for fault diagnosis, repairing and maintenance of electrical machines. Help, test sequence of fault finding of electrical. Typically, electrical faults take multiple hours, if not days, to repair. Fault diagnosis of induction motor using mcsa 17 different number of broken rotor bar. An image of this process is that of aviation maintainers. Electric motor system diagnostics electric motor system diagnostics richard scott alltest pro, llc. Online fault diagnosis test practice test download fault diagnosis test practice test. The subject of the thesis is fault diagnosis for unmanned aircrafts. Condition monitoring has a great potential for enhancement in the reliability of operation.
In this episode we resolve a fault on a ring circuit and repair some downlights that were not working in a kitchen. Signature analysis for synchronous generators predictive. Then, tests were carried out for full loads with faulty motors having up to 12 broken rotor bars. Pdf an expert system for fault diagnosis, repairing and. Fault diagnosis and identification, induction motor. Problems must be solved by replacing only defective equipment or. Apdf split demo chapter 8 testing and troubleshooting. Define electrical maintenance electrical maintenance involves the fault diagnosis, routine servicing, and repair of electrical components of a machine.
Safe and effective troubleshooting of electrical systems is an essential skill for maintenance technicians in industrial, utility, or commercial settings. Whether in the home or work environment, electrical faults put people at risk of electrocution and electrical fire. Carry out all of the following during the fault locating activity. Electrical measurements and fault diagnosis diploma in. Fault diagnosis and fault handling for autonomous aircraft. The fault diagnosis of rotating electrical machines has received an intense amount of research interest during the last 30 years. This paper presents an original software tool based on a model of expert system that has been developed to satisfy the requirements of fault diagnosis, repair and maintenance of electrical machines in industrial, educational or other applications. Proceedings of the 6th wseas international conference on applications of electrical engineering, istanbul, turkey, may 2729, 2007 167 2. This paper presents an original software tool based on a model of expert system that has been developed to satisfy the requirements of fault diagnosis, repair and maintenance of electrical.
Industrial fault detection and fuzzy diagnosis system for textile industry chapter 2 machine, fault and fault diagnosis 36 it offers low maintenance requirements, quick style change and lowest production cost which all contribute to increase the profitability. Fault detection, isolation, and recovery fdir is a subfield of control engineering which concerns itself with monitoring a system, identifying when a fault has occurred, and pinpointing the type of fault and its location. Fault diagnosis and maintenance of communications equipment unit code. The methods can be used as an aid to aircraft operator or as part of a fault tolerant control system. Electrical maintenance and fault diagnosis previous year question paper. The focus of this paper is the design of efficient diagnostic algorithms, which is a prerequisite for fault. You will be required to diagnose faults on a range of electrical equipment, such as single and threephase power supplies, motors and starters, switchgear and distribution panels, electrical plant, control systems and equipment, and luminaires. Standard for an electrical preventive maintenance epm. Reducing maintenance costs and preventing unscheduled downtimes. A direct pattern recognition of sensor readings that indicate a fault and an. There are numerous causes that could be listed for machinery failure. Green indicates that a developing fault can be both detected and trended for predictive maintenance purposes. In this section we look at the general principles of fault finding through the application of diagnostic reporting.
For the purposes of this guide, it is reasonable to discuss testing and troubleshooting as closely linked elements of aviation maintenance. The working group was established in november 1995. Certificate course in maintenance and reliability module 2 machinery vibration analysis fundamentals session 7 vibration analysis for fault diagnosis 1. The customer called us out as they were not getting any power at points in their. Carrying out fault location on electri cal equipment and circuits sememi209 carrying out fault location on electri cal equipment and circuits 1 overview this unit identifies the competences you need to locate faults on electrical equipment and circuits, in accordance with approved procedures. This optimization is not possible without a correct fault diagnosis besides critical components and common failure modes knowledge. As modern equipment of all types becomes more dependent on electronic control systems and arguably more complex the ability to approach problems logically in order to find the cause of the fault is. Fault diagnosis, prognosis and reliability of electrical. The magnetic flux spectrum technique is also an inva sive method, once it studies the signals from sensors that need to be installed inside the motor, thus increasing the initial cost of the machine and making the system less ro. Fist 41b, maintenance scheduling for electrical equipment 5c. Locating faulty components, identifying power quality problems, and troubleshooting circuits are just a few of the issues the maintenance technician may be confronted with when repairing. Standard for an electrical preventive maintenance epm program page 410 connections. There is a generally recognised method of approaching fault finding, which is referred to as the 5point faultfinding approach.
Mem18048b fault find and repairrectify basic electrical. The engineer service, repair and maintain the electrical components of a plant. Carrying out fault diagnosis on electrical equipment and. Carrying out fault location on electri cal equipment and circuits sememi209 carrying out fault location on electri cal equipment and circuits 5 additional information scoperange related to performance criteria you must be able to. Despite the plethora of fault diagnosis methods, there has not been a consensus on what is appropriate at any fault type extracting state probabilities from observations, remains a challenge, we do not have adequate models of fault development in electrical drives rotor bars, demagnetization, solder and. Here are a few obvious signs that you might have an electrical fault. Based on the results provided by the methods, it is possible to promptly take appropriate maintenance actions and ensure healthy operation of the machines. Faults include defects in instrumentation, power generation, transformation and transmission. Carrying out fault diagnosis on electrical equipment and circuits semem311 carrying out fault diagnosis on electrical equipment and circuits 3 knowledge and understanding you need to know and understand. The main focus has been on developing methods which uses telemetry data from an unmanned aircraft to detect faults in sensors and actuators. Any equipment with an identified fault must be removed from service, until the fault is rectified. Diagnosis of mechanical faults in electric motors neelam turk department of electronics and comm. Nevertheless, the main difference between intelligent fault diagnosis and traditional fault diagnosis lies in the fault recognition, and they both need the signal processing techniques.
Find meru university of science and technology eee 0125. Application of the unit application of the unit this unit applies to working on basic circuit which is. Here, john saysell, head of business development and technical training at mcp consulting group, explains his sixstep approach to fault finding. Diagnosis in a grid depends on available analytic redundancies and hence on network topology. This type of failure is largely due to management not fully understanding that maintenance is an investment in the business and not just an expense of doing business. Fault management in electrical distribution systems final report of the cired working group wg03 fault management foreword this text comprises the final report of cired working group 03 fault management. Investigate now attempt to find the fault from your analysis. Fault diagnosis for electrical distribution systems using.
1049 481 197 1245 623 1084 443 1229 381 281 302 54 1212 876 439 1250 779 535 216 951 1506 1427 245 942 849 1479 563 650 747 583