A transformer which increases thevoltages is called a stepup transformer. Video lecture on open circuit test and short circuit test on transformer of chapter single phase transformer of subject basic electrical engineering for. It can be designed to step up or step down voltages and works on the magnetic induction principle. Transformer is, therefore, an essentialpiece of apparatus both for high and low currentcircuits. Singlephase transformers electrical and computer engineering. Transformerreport project report electrical engineering. The lab setup for the opencircuit test is similar to that of the shortcircuit test.
The lab assistant will have a single phase transformer circuit connected on the lab bench. In the simplest version it consists of two windings wrapped around a magnetic core. Polarity testing of transformers is vital before connecting them in parallel. Theory transformers are arguably the most universally applied pieces of electrical equipment. Operate a single phase transformer offload, with a load applied and with a short circuit applied 2. Theory of operation of singlephase transformers custom. Transformers are widely used to stepup or stepdown the voltages and currents. It is possible to determine the total series impedance referred to the primary side by using this technique, but there is no easy way to split the series impedance into primary and secondary components. Sumpners test on a pair of identical single phase transformers 3. Transformer on load single phase transformer basic. To determine regulation and efficiency of a single phase transformer using open circuit o. Open circuit test and short circuit test on transformer. Experiment 1 the single phase transformer objectives to understand the basic working principle of a transformer.
Load test on single phase transformer with lab manual. Save the harmonic analyzers screen by printing it to a pdffile. Unit 7 single phase transformers 237 the principles of transformer operation. The maximum value of the magnetic flux density is 1. The various conditions which must be satisfied for the parallel operation of two or more single phase transformers are. In this method, a resistive load is connected to the transformer and its loaded up to the rated current. Experiments for first year electrical engg lab 201415 dept of electrical engineering, shri ramdeobaba college of engineering and management, nagpur 4400 india page 4 on lhs by hand with pencil experiment no. Department of electrical and electronics experiment 1 single phase fully controlled scr bridge circuit aim.
Basics, maintenance, and diagnostics vii contents continued page 4. Electrical machines for mechatronics laboratory 2 1 experiment 2 single phase transformer i objectives to determine the turns ratio of a single phase transformer. It consists of singlephase transformer, variac and lamp bulb connected in series with the. Pdf a novel transient current limiter based on threephase. To understand the basic working principle of a transformer. To measure single phase power by using three ammeter method. Check proper phasing and voltage of the bank to the system before load is. To measure the single phase power by using three voltmeter method. Being familiar with operating characteristics of three phase transformers.
Electrical machines for mechatronics laboratory 3 6 load test introduction in the transformer load test the primary winding is connected to the supply voltage and various load levels are applied on the secondary winding. The circuit diagram of a single phase halfwave diode rectifier is shown in fig. The three phase system application means using three single phase units connected in the three phase system. The rated voltage is applied to the primary and its two terminals are marked as. Describe the wave shapes observed during part1 of the experiment. Project report electrical engineering lab introduction transformer a transformer is an electrical device that transfers energy between two or more circuits through electromagnetic induction. As soon as the primary winding is connected to a singlephase supply, an ac current starts flowing through it. The circuit will have a transformer with a 117v primary and a 25v secondary. Single phase transformer and applications of single phase. Voltage and current measurements will be used to study transformer operation. Transformer waveforms steadystate testing and performance of single phase transformers report must be the students own work. The load test is performed on a single phase transformer, to find out its efficiency and regulation.
Single phase power transformer lab report shu studocu. Otherwise, with incorrect polarity, it is not possible to connect them in parallel. A transformer is an electrical device that transfers electrical energy between two or more circuits. The phaseo abt7, abl6 single phase transformers offer is designed to supply control circuits in electrical equipment from a 230 v a or 400 v a supply depending on the model at 50 or 60 hz. Experiments for first year electrical engg lab 201617 dept of electrical engineering, shri ramdeobaba college of engineering and management, nagpur 4400 india page 1 experiment no aim. The performance parameters of the rectifier with a purely resistive load are given by. Furthermore, this transformer has a power rating of 100va meaning that it can accept a maximum of 100 watts of power. The tactic relies on a threephase thyristors bridge single rl reactor with the. The following experiments are required to be conducted as compulsory experiments. Aim to draw the load characteristics of a given single phase transformer by conducting load test. Open circuit and short circuit test on single phase transformer aim to draw the efficiency and regulation characteristics of single phase transformer.
To study operation of single phase fully controlled rectifier for r load. To determine regulation and efficiency of a single phase transformer by open circuit o. To study the voltages and currents curves when the operating single phase transformer. To study the characteristics of the single phase transformer. In this lab, students will explore the characteristics of a singlephase transformer, including the nonlinear nature of ac excitation and linear models. The principle of operation of a transformer has been explained in the following simple steps. Open circuit and short circuit tests on single phase transformer.
The primary side will have the line power source and a combined voltmeter and power analyzer ammeter. To experiment in detail on transformers, induction motors, alternators and synchronous motors, and evaluate their performance characteristics. A single phase transformer has 480 turns on the primary winding and 90 turns on the secondary winding. To perform short circuit test on a single phase transformer. The single phase transformer that you will be using in this lab experiment. The advantages of three single phase units are transportation, maintenance, and spare unit availability. Experiment using dc reactor type inrush current limiter are carried out and. Normally, transformers are designed to have fixed ratios between the primary and secondary windings. The transformer used in this experiment is rated to tolerate a maximum of 115 volts on the primary winding and a maximum of 24 volts on the secondary winding. Sumpners test on similar transformers and determination of combined and individual transformer efficiency. Short circuit and open circuit test in single phase transformer. Comment on the frequency, phase, and any distortion of these waveforms.
To setup for the opencircuit test, remove the shortcircuit wire on the transformer. Experiments for first year electrical engg lab 201617. Apparatus apparatus functionality ac analog voltmeter a type of pointer instrument that measures voltage in circuits with alternating current. Reduction of transformer transient inrush current by step voltage. It is used to change voltages and currents of ac electric power. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. Electrical machines for mechatronics laboratory 2 9. It is possible to determine the total series impedance referred to the primary side by using this technique, but there is no easy way to split the series impedance. A transformer is a static apparatus used to transform a. Deduce the relationship between the secondary voltage and the loading and give reason for the deduction 3.
Variable ac source the labs variable ac source shown in figure 4. The working characteristics of a shelltype transistor in noload circuiting condition and short circuit condition are also expected to be tested and understood. To determine the parameter values of the excitation branch that model the core and magnetization losses in a real transformer. This is a more expensive solution, and it is used in the high voltage power system. To study the vi characteristics of an incandescent lamp. Open circuit and short circuit tests on single phase step up or step down transformer and predetermination of i efficiency and regulation. Experiments for first year electrical engg lab 201415.
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