Diploma in electrical and electronics engineeringmodule i. This is because special measurement techniques are used to provide early detection of faults long before the results become evident in the wholebody vibration of the machine. Reveal answer based on these measurements, we are able to determine that the batterys voltage is 12 volts, that the light bulb has good continuity, and that there is a single break in the circuit. Electrical powers system is growing in size and complexity in all sectors such as generation, transmission, distribution and load systems. Then it is important to note that this failure mode is generally initiated by high. Electrical units of measurement are used to express standard electrical units along with their prefixes when the units are too small or too large to express as a base unit. A multimeter can be a handheld device useful for basic fault finding and field service work or a bench. Electrical measurements and fault diagnostics 66 hours. This course module unit is intended to provide the trainee with knowledge, skills and attitudes in order to carry out basic measurement and fault diagnosis, and. Review the components of a basic automotive electrical circuit. Instruments and measurement important points duration.
Such a fault can be traced by carrying out capacity test. Diploma in electrical and electronics engineering machakos. Identifying the vibration problems that can occur in inductionmotor drives have an added complexity due to the rotating magneticfields in the machine. Each type of fault, electrical faults or mechanical faults, produces a vibration whit a specific frequency. Short circuit fault diagnosis in switches of a singlephase. Fault analysis and diagnosis system for induction motors. Application notes vibration diagnostics for industrial. Mem18048b fault find and repa irrectify basic electrical circuits date this document was generated. Note that the numbers of measure are multiplied as well as. Find machakos institute of technology electrical measurements and fault diagnosis previous year question paper. As practical skills we aim at the end of the course to be able to perform simple electrical measurements of voltage, current, and resistance, as well as. In section 5, the proposed enn fault diagnosis system was used for fault diagnosis of the.
Electronic measurements and instrumentation pdf notes emi notes pdf. R, l, c voltage division experimental plots time domain frequency domain bode plots instrumentation. A multimeter is an ideal piece of test equipment to help with fault finding an electronics transistor circuit. And then, section 3 expounded the proposed motor fault diagnosis system. Download engineering books free online pdf study material for all mechanical, electronics, electrical, civil, automobile, chemical, computers, mechatronic, telecommunication with most polular books free. Pdf eec 2209 electrical measurement fault diagnosis. In this section we look at the general principles of fault finding through the application of diagnostic reporting. The capacitance of the faulty cable is measured from both ends of the cable either by means of ballistic galvanometer or by bridge method. Fault diagnosis, prognosis and reliability of electrical drives. Pdf condition monitoring and fault diagnosis of electrical. Open circuit fault can be occurs when cable is pulled out of its joint or a break occurs in the cable. All emission related fault codes must be consistent with those described in section 6.
Review the characteristics of voltage, amperage, and resistance in series and parallel circuits, showing how they. Page 37 of the course notes for the electronic fault finding course, showing how voltage regulators are typically marked and their common terminal layouts. Metrology and measurement systems index 330930, issn 08608229. Ondel et al coupling pattern recognition with state estimation using kalman filter for fault diagnosis, tie 2012. Page 30 of the course notes for the electronic fault finding course, showing how leds and diodes should be tested. Principles of systematic fault diagnosis diagnosis of faults requires a logical and disciplined approach. When reporting relative errors it is usual to multiply the. An analysis of the measured vibration signal spectra for 10 fault types was made in section 4. Application notes vibration diagnostics for industrial electric motor drives the induction motor is the most widely employed industrial electricdrive. R, l, c voltage division experimental plots time domain frequency domain bode plots instrumentation instruments that generate signals instruments that measure signals. It will evolve over time, especially based on input from the linkedin group fault detection and diagnosis.
Electrical measurements and fault diagnosis diploma in. Introduction to electrical measurements and fault diagnosis. Signal processing techniques for electrical machines diagnosis. Block schematics of measuring systems, performance characteristics, static characteristics, accuracy, precision, resolution, types of errors, gausian error, root sum squares formula, dynamic characteristics, repeatability, reproducibility, fidelity, lag. Some aspects of knowledgebased fault diagnosis in electronic. Electronic measurements and instrumentation pdf notes emi. The example of onboard diagnostic system operator screen from. Types of faults and effects in electrical power systems. Electrical measurement and fault diagnosis notes pdf.
Recording of measurement data many techniques now exist for recording measurement data in a form that permits subsequent analysis, particularly for looking at the historical behaviour of measured parameters in fault diagnosis procedures. The megger technical library provides access to a range of additional content and resources such as technical guides, application notes and more. The detail of the particular methods used for bearing fault detection and analysis will be dealt with in a later session. Types of faults like short circuit condition in power system network results in severe economic losses and reduces the reliability of the electrical system. Mem18048b fault find and repairrectify basic electrical circuits. Mem12002b perform electrical electronic measurement. A course in electrical and electronic ieasurements and instrumenraticn. A simulation and practical results of a common fault occurred in the voltage source inverter used for vf drive for induction motor, namely.
Principles of electrical measurement by slawomir tumanski. Through monitoring and analyzing the vibration spectrum these specific frequencies can be detect and through these we can detect usages, slackness and forces which act and produce the fault. In addition to accuracy and precision, measurements may also have. Diagnosis and fault detection in electrical machines and drives. These principles apply in all disciplines regardless of whether they are civil, electrical, mechanical etc. The essential component of a toaster is an electrical element a resistor that converts electrical energy to heat energy. Electrical field, e, is the negative of the gradient in electrical potential, i. This guide to fault detection and fault diagnosis is a work in progress.
The standard units of electrical measurement used for the expression of voltage, current and resistance are the volt v, ampere a and ohm. Further, this document is not intended to be used for commercial. Furthermore, we will discuss selected electrical measurement methods used to obtain chemical and physical information of liquids, solids, and interfaces. A course in electrical and electronic measurements and. Note the 40 microvolt difference between the twomeasurements, an.
Physical aspects physically, torsional vibration is similar to lateral vibra tion, after shaft twist has been substituted for shaft bending. Analysis of stator and rotor faults in wound rotor induction machines44. Sarah harriss lecture from 2009 overview circuits electrical building blocks. The computeraided fault diagnosis of electronic devices requires the acquisition of different kinds of information i e, for the diagnosis strategy, measurement tasks and documentation. Fault detection of the electrical motors based on vibration. Murrayvarrley loop short circuit fault loop test loop test can be carried out for the location of either a ground or a short circuit fault.
Electrical measurements and fault diagnosis question papers. In addition to dc methods we will focus on ac measurements and impedance spectroscopy. Jan 15, 2019 a permanent magnet moving coil pmmc meter also known as a darsonval meter or galvanometer is an instrument that allows you to measure the current through a coil by observing the coils angular deflection in a uniform magnetic field. Note that the voltage depends on the very well defined values. How much current is drawn by a toaster with resistance 12w at 110v. Limit the number of measurements learn from a database a law modeling the different states representation of membership function. Basic electrical measurements e80 feb 26, 2012 prof. Feel free to use the past paper as you prepare for your upcoming examinations. Electrical basics electrical safety electricity is a wonderful utility, but can be dangerous if not approached carefully.
Fault detection and diagnosis is a key component of many operations management automation systems. Fault evolution kalman predictor representation of fault evolution trajectory. Fault diagnosis on electric power systems based on petri net approach. The matter presented here is prepared by the author for their respective teaching assignments by referring the text books and reference books. Electrical and electronics measurements and instrumentation. Torsional vibration of machine systems by ronald l. Electrical measurements and fault diagnosis question.
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