C test data are given below for a single phase, 5 kva. Arrangement of bus bar, circuit breaker and isolator. Debaprasad kastha, department of electrical engineering, iit kharagpur. The angle setting is commonly referred to as the maximum torque angle, mta. Digital testing 5 common fault models single stucksingle stuckat faultsat faults transistor open and short faults memory faults pla faults stuckpla faults stuckat, crossat, crossat, crosspoint, bridgingpoint, bridging functional faults processors delay faults transition, path analog faults for more examples, see section 4.
Nptel electrical engineering video lecture online study. Click here for a list of nptel online courses for aicte fdp, jan apr 2019. Basic techniques for accurate resistance measurement. Chapter 5 engineering properties of soil and rock 5. As of today we have 110,518,197 ebooks for you to download for free. What are the websites for nptel online assignment solutions. Chapter 4 metal matrix composites princeton university. For yconnected load, line current equals phase current. Skin effect, voltage regulation, high corona, reliability, reactive power. A very lowfrequency test voltage is applied across the equipment whose insulation to be tested. The implementation of the current mirror circuit may seem simple but there is a lot going on. Voltage applied is such that the rated current flows in the windings. Testing of transformers, surge diverter radio interference measurements. The final nptel exam pattern is mostly multiple choice questionsmcq only.
On the other hand, the inductive reactance vanishes as. For current transformers, the value of the reactance x is determined in a special way so that it represents the leakage flux. The eddy current method is based on the principle of generating circular electrical currents eddy currents in a conductive material. From the uniaxial tensile test, one can understand material behavior considerably. Fault modeling electrical engineering and computer science. You can contact them, i am sure you will get solutions of your problems there. Prior to testing, short the primary winding of the ct under test by connecting h1 and h2, then short the secondary winding of the ct under test by connecting x1 and x2x5. Figure 4 the saj eddy current dynamometer used for engine testing. If the measured impedance is less than the reach point impedance, it is assumed that a fault exists on the line between the relay and the. This was supplied by a large fan and cowling which provided airflow over the engine at approximately 40 kmh. Over a complete cycle, the first term represents the energy loss, which is called hysteresis loss. Control by the gate voltage is achieved by modulating the conductivity of the.
To schedule any of these courses at your company for onsite training, call iist at 763 5460072. Experiments with instrumented pile groups in sand, american society for testing and materials. The lens focuses light onto the retina, which contains very many lightsensitive receptor cells called rods and cones that operate using a photochemical process to convert incident light into. The cable, winding, current transformer, potential transformer, transformer bushing, on which tan delta test or dissipation factor test to be conducted, is first isolated from the system. C resistivity, testing of insulators and bushings, etc. Electrical engineering basic electrical technology nptel. Kamaraju, high voltage engineering, tata mcgrawhill, 4th edition, 2009. There is a website which is taking interest in publishing nptel answers. Pol is in phase with current when current lags the 1.
Lecture 24 mosfet basics understanding with no math reading. Ppt non destructive testing powerpoint presentation. Electrical, electronics and communications engineering. No annoying ads, no download limits, enjoy it and dont forget to bookmark and share the love. Current regulatory requirements for conducting clinical trials in india for investigational new drugsnew drug version 2. Operational amplifier, difference amplifiers, biasing of differential amplifiers, practical operational amplifier, parameters of an opamp, open loop opamp configuration, closed loop amplifier, voltage shunt feedback, opamp applications, oscillator, harmonic oscillators, tuned oscillators, voltage regulators. Polar bear writing paper kids homework organizer dissertation topics for international business management current events essay. View notes l25tbet eenptel from ee 203 at iit kanpur. On either side, the electrons are present up to the fermi energy. The high voltage engineering notes pdf hve pdf notes book starts with the topics covering gases as insulating media, electromechanical breakdown, generation of high direct current voltages, measurement of high direct current voltages, measurement of d. Current, voltage, humidity, temperature, uv, saltfog, rain. At the end of each lesson a set of problem is provided to test.
Figure 4 works well for most instrument transformers. The simple two transistor implementation of the current mirror is based on the fundamental relationship that two equal size transistors at the same temperature with the same v gs for a mos or v be for a bjt have the same drain or collector current. Real transformer noload condition, flux and magnetising current in most of the transformer, there are losses due to various reasons and doesnt have the efficiency of the ideal transformer. Principles and characteristics of distance protection. Complete current affairs ebook pdf just 100 rs only all 12 months 2018 lec notes. Insulation tests on current transformers rated 600v or less are usually performed at vdc. Potential and current transformers, ratio and phase angle errors, phasor diagram, methods of minimizing errors. The assignment socre 25% will be add to final score. The basic principle of distance protection involves the division of the voltage at the relaying point by the measured current. Two commonly used stress ratios are the ratio, a, of the alternating stress amplitude to the mean.
Nptel mechanical engineering forming joint initiative of iits and iisc funded by mhrd page 3 of. These equipments are organized to determine the characteristics of materials and. Vibrating reed type, electrical resonance type moduleii 10 hours instrument transformers. Lecture 24 mosfet basics understanding with no math. Electrical machinesi nptel online videos, courses iit. Equipment do not cause any damage to the materials that are subjected to assessment or evaluation. This is the time between the instant of occurrence of the fault to the instant at which the relay contacts open. Short circuit test is generally carried out by energizing the hv side with lv side shorted. As an example, if the resistance value is a million ohms 1 megohm, the current here is. Nondestructive testing ndt is a testing and analysis technique used by industry to evaluate the properties of a material, component, structure or system for characteristic differences or welding defects and discontinuities without causing damage to the original part. All software testing and quality assurance training courses are available for offering at your company site to maximize learning and minimize cost. Hysteresis and eddycurrent losses of a transformer. The apparent impedance so calculated is compared with the reach point impedance.
A circuit marginality such as chargesharing in a domino gate. Nptel transformers video lectures, electrical machines lectures, dc machines video, nptel video lectures, nptel online courses, youtube iit videos nptel courses. The second term represents the energy loss due to conduction currents or the eddy current loss. Alan doolittle flow of current from source to drain is controlled by the gate voltage. Also if field current is held constant during loading, the core loss too can be assumed to remain same. Current limiting reactors in power system and their arrangement calculation of fault mva for symmetrical short circuits. Theory and practice of non destructive testing nptel.
During power measurements it necessary to provide sufficient cooling air to the engine to avoid overheating. Lecture 6 scanning tunneling microscopy stm general. Eddy current testing eddy current testing is particularly well suited for detecting surface cracks but can also be used to make electrical conductivity and coating thickness measurements. Need to finish those assignments in the given time period. Theory and practice of non destructive testing video. Here a small surface probe is scanned over the part surface in an attempt to detect a crack. Thanks for a2a if a candidate register on a special courses there will be week assignments which is also mcq type. These kinds of transformer are termed as the real transformers. A magnetic field is created by an electrical current in the coil of a probe. In this test, the motor is run at rated speed under no load. Nondestructive testing equipment market nondestructive testing equipment is used for inspection and assessment of many properties of components, materials, and assemblies.
Testing and maintenance of protective gear, protection against surgesurge absorber, surgediverter. Remove the neutral ground and isolate the ct from any associated burden. An introduction to ndt common methods 5 this process is called accommodation and gives us very fast continuous focusing adjustment. Nptel provides elearning through online web and video courses various streams. Compared with unreinforced metals, mmcs offer higher specific strength and stiffness. When the probe is placed on the insulation, fireproofing, or coating, the field penetrates through all the layers. The stress ratio is the algebraic ratio of two specified stress values in a stress cycle. Tan delta test loss angle test dissipation factor test. This is achieved by the use of a coil connected to an alternating current generator driving an alternating magnetic field primary field. This control current is feedback regulated by the output from the rpm sensor, but only if you run the necessary coax. When the specimen and the tip are brought close to each other, there is only a narrow region of empty space left between them. This is the time between the instant of closing of relay contacts to the instant of final arc extinction inside the medium and removal of the fault.