Basic circuit analysis 23 example the bridge circuit again we know that the seriesparallel reduction method is not useful for this circuit. Results of the short circuit analysis running short circuit analysis. As a comprehensive field test, customers have the most accurate diagnosis available of. In addition, there will be a brief look at study case editors and the alert view function. This excessive electric current potentially causes circuit damage, overheating, magnetic stress, arcing, fire or explosion. Estimating electric motor life using motor circuit analysis is part 3 of motor testing made easy. The basics of motor circuit analysis reliable plant. The resulting low level alternating magnetic fields excite the dielectric dipoles and surrounding magnetic steel. A practical estimate of motor short circuit contribution is to multiply the total motor current in amps by 4. The parade pattern displays individual cylinders side by side from left to right, in firingorder sequence. Lesson 1 voltage, current, resistance engineering circuit analysis math and science. Mtis motor circuit analysis mca provides a complete analysis of your motor circuits. Theory, application and energy analysis winding analysis for motors and transformers features basic and advanced techniques for motor circuit analyzers, software tools, the us department of energys motormaster plus, webbased training, support and the basic steps to put together a planned maintenance program. Electric motor testingdeenergizedoffline motor circuit analysis fox river systems, inc.
For the purpose of the analysis results presented within this paper an alltest iv pro tm 2000 motor circuit analyzer mca was selected as it provided resistance to one milliohm. Direct current motor electrical evaluation using motor circuit analysis howard w. The handbook of electric power calculationsprovides detailed stepbystep calculation procedures commonly encountered in electrical engineering. Efficient way to get immediate data about motor health and trend data tests 3phase ac induction squirrelcage motors under 1kv both static and dynamic testing. Overview of circuit components resistor, capacitor. U120 a simplified approach to dc motor modeling for. To learn more about mca deenergized testing, click here. Circuit analysis of 3 phase system balanced condition. Utilizing stateoftheart motor circuit analysis technology on an ongoing basis, mtis staff can obtain a detailed look of your motors electrical components to identify problems that need to be addressed before failure occurs. This paper is a tutorial on the threephase circuit analysis of the transmission line circuit and is of a scale that can easily be implemented on a pc using a math program such as mathcad tu 1. Motor circuit analysis concept and principle semantic.
Pdma corporation has developed these portable motor testers. Introduction to short circuit analysis course content a short circuit is a lowresistance connection established by accident or intention between two points in an electric circuit. From the shortcircuit analysis point of view, threephase fault lends itself to singlephase analysis, because the fault is balanced all three and asks for phases, presuming a balanced threephase electrical system. Electric motor testing deenergizedoffline motor circuit. Threephase circuit analysis and the mysterious k0 factor. For the purpose of the analysis results presented within this paper an alltest iv pro tm 2000 motor circuit analyzer mca was selected. The advantage to testing from the mcc is that the entire electrical portion of the motor system, including the connections and cables between the test point.
In recent years, continuous demand for efficient, compact and low cost applications in the motor control industry has led to a boom in inverterbased solutions driven by mcus. Electrical circuit analysis 1 textbook is especially prepared for jntu, jntua, jntuk, jntuh university students. In this particular case, i show a lowvoltage control circuit and a 3phase, higher voltage motor. When a short circuit occurs, motor contribution adds to the magnitude of the shortcircuit current. The threephase system has three live wire and one returns path. Threephase analysis, relay perfonnance, relay settings, fault impedance. Direct current motor electrical evaluation with motor. Analysis of a simple rl circuit with ac and dc supply. Before examining the driven rlc circuit, lets first consider the simple cases where only one circuit element a resistor, an inductor or a capacitor is connected to a sinusoidal voltage source. Some of the figures in this slide set are taken from the books r.
Fox river systemssnell group level 1deenergized electric motor testing 32 hour class and certification exams. The superimposed pattern places all cylinder waveforms upon each other so there appears to be only one pattern. Analysis of a simple rl circuit and inductor behavior analysis of a simple rl circuit with dc supply. Both dynamic and static testing are nondestructive methods. The purpose of this tutorial is to introduce the shortcircuit analysis module of etap, and provide instructions on how to run ansi and iec shortcircuit calculations. Motor circuit analysis mca techniques utilizing resistance, impedance, inductance, phase angle, currentfrequency response and insulation resistance have been in practice since 1985. In spite of these disadvantages, the brushless permanent magnet motor is gaining increasing use because of its low maintenance and the availability of inexpensive and robust power electronics for motor control.
This presentation is brought to you by bjm corps alltest pro division. Induction motor circuit analysis takes the guess work out of understanding the electrical health of motors. An essential working tool for new and experienced motor circuit analysts. Mktv, so that if it is necessary to derive an expression relating the speed to the applied voltage, it can be written. The raster pattern stacks individual cylinders one above the other from bot. The single phase system has only one phase wire and one return wire thus it is used for low power transmission. Loadflow analysis in power systemsgalli, anthony w. Short circuit current calculations cooper industries. The authors of this book clearly explained about this book by using.
This method can be initiated from the motor control center mcc or directly at the motor. Direct current motor electrical evaluation with motor circuit. Lin, linear circuit analysis, second edition, 2001, oxford university press and c. Estimating electric motor life using motor circuit analysis. In an analysis of an induction motor, the equivalent circuit can be simplified further by omitting the shunt reaction value, gx. This is a linear differential equation, which you know how to solve. The simplified circuit for the stator then becomes. Motor circuit analysis mca is often and easily confused with motor current analysis mca, which is an abbreviated version of motor current signature analysis mcsa. Emc design guides for motor control applications alessio corsaro, carmelo parisi and craig rotay introduction.
In this lecture we will develop two very powerful methods for analyzing any circuit. Our patented motor circuit analysis is a deenergized test method used to assess the health of the entire motor. Draw the approximate equivalent circuit for the motor lockrotor noload dc test v line 36. The core losses associated with this value can be subtracted from the motor power and torque when the friction, windage and stray losses are deducted. Circuit analysis with sinusoids let us begin by considering the following circuit and try to find an expression for the current, i, after the switch is closed. The question is how to apply the transformation so that the circuit can become solvable using the seriesparallel reduction or other ac. Online monitoring of power circuit, overall motor health, load, and performance issues can be achieved with the computer controlled portable. Enter your mobile number or email address below and well send you a link to download the free kindle app. The handbook contains a wide array of topics and each topic is written by an authority on the subject. This is a common mistake and one that has contributed to the confusion surrounding the second common mistake.
Dynamic online monitoring combined with comprehensive static offline testing enhances motor condition awareness. Our deenergized testing instruments include limited testing range solutions such as the motor genie, as well as fullrange testing devices such as our new and. This is one of the important subject for electrical and electronic engineering eee students. The key issue has to do with the ability to compare one coil to the next. Bjm corp is a premier manufacturer of electrical submersible pumps and alltest motor circuit analysis equipment. The technique has been successfully applied for the detection of winding defects shorts, resistive unbalances and insulation to ground, cable defects and rotor. Associate professor, electrical and computer engineering, university of missourirolla.
Electrical circuit analysis 1 pdf free download askvenkat. Electrical circuit analysis 1 pdf free download electrical circuit analysis 1 pdf free download. Circuit analysis of 3 phase system balanced condition the electrical system is of two types i. A short circuit analysis is used to determine the magnitude of short circuit current the system is capable of producing and compares that magnitude with the interrupting rating. Motor circuit analysis concept and principle semantic scholar. Though it is a simple circuit but if you will analyze it, your electrical engineering basics will be enhanced. Theory, application and energy analysis is the first of the motordoc commercial and industrial series.
Low voltage motor circuit analysis mca techniques involve the collection and analysis of resistance, impedance, inductance, phase angle, currentfrequency response and insulation to ground faults. The authors of this book clearly explained about this book by using simple language. Easy and simple methods for calculating short circuit curr. Power circuit all connections, components, and cables between the mcc and the motor must be resistively balanced. Motor and circuit analysis advanced technology solutions. Other short circuit current conditions will bring in imbalances that need the analysis of the remaining.
Lesson 1 voltage, current, resistance engineering circuit. Companies across the globe trust our reliability solutions, products, and services. From the short circuit analysis point of view, threephase fault lends itself to singlephase analysis, because the fault is balanced all three and asks for phases, presuming a balanced threephase electrical system. Output voltage of the test instruments are less than 9 vac, sinusoidal output. Routecapable analyzer for trending, troubleshooting, pdm, and quality control menudriven operation no need for manuals compact size 2 lbs test transformers, acdc motors, and generators. The pages where these models appear are indicated n the table of contents. These methods are based on the systematic application of kirchhoffs laws. The locked rotor test is made at 15 hz to minimize the errors due to saturation and skin effects. President, success by design old saybrook, ct abstract low voltage motor circuit analysis mca techniques involve the collection and analysis of resistance, impedance, inductance, phase angle, currentfrequency response and insulation to ground faults. Motor and circuit analysis advanced technology solutions, inc.
As motor circuit analysis is effective in assessing any electrical windings, it can be used for all types of motors and generators, even transformers. When there are motors in the system, motor short circuit contribution is also a very important factor that must be included in any shortcircuit current analysis. Motor short circuit contribution, if significant, may be added at all fault locations throughout the system. Motor circuit analysis maintenance technologies international. Feb 04, 2016 lesson 1 voltage, current, resistance engineering circuit analysis math and science. Motor circuit analysis mca is a deenergized test method to assess the health of the motor. Determine the motor parameters and the total core, friction and windage losses.
Mcegold compares each phase of resistance, current, and voltage to ensure a perfect balance. A very common form of latch circuit is the simple startstop relay circuit used for motor controls, whereby a pair of momentarycontact pushbutton switches control the operation of an electric motor. The treatment throughout the handbook is practical with very little emphasis on theory. Pdma corporation is the leader in the field of predictive maintenance, condition monitoring applications, and the development of electric motor test equipment for motor circuit analysis. Motor circuit analysis concept and principle howard w penrose, ph. The resulting low level alternating magnetic fields excite the dielectric dipoles and surrounding. Again we will do this by placing a charge on the capacitor since there is a resistor in the circuit now there will be losses as the energy passes through the resistor. Includes information and materials for using the bjm corp alltest iii, alltest iv pro 2000, software tools, and the u.
The stardelta transformation may solve this problem. Shortcircuit current calculations cooper industries. Potential problems occur when loose or corroded connections are introduced in a circuit. Rlc circuit no generator like the lc circuit some energy must initially be placed in this circuit since there is no battery to drive the circuit.
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