Deduce the relationship between the secondary voltage and the loading and give reason for the deduction 3. Load test on single phase transformer with lab manual. An alternating flux is produced in the core by the ac primary current. Experiments for first year electrical engg lab 201415. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. Transformers are widely used to stepup or stepdown the voltages and currents. A transformer is an electrical device that transfers electrical energy between two or more circuits.
Voltage and current measurements will be used to study transformer operation. To study the voltages and currents curves when the operating single phase transformer. Polarity test of a singlephase transformer electrical. The single phase is used in a place where less power is required and for running the small loads. Open circuit and short circuit tests on single phase step up or step down transformer and predetermination of i efficiency and regulation. 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. Single phase power transformer lab report shu studocu. The primary side will have the line power source and a combined voltmeter and power analyzer ammeter.
To perform short circuit test on a single phase transformer. It consists of singlephase transformer, variac and lamp bulb connected in series with the. Comment on the frequency, phase, and any distortion of these waveforms. Transformer on load single phase transformer basic. 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. As soon as the primary winding is connected to a singlephase supply, an ac current starts flowing through it. The three phase system application means using three single phase units connected in the three phase system. 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. Sumpners test on a pair of identical single phase transformers 3. Save the harmonic analyzers screen by printing it to a pdffile. To determine the parameter values of the excitation branch that model the core and magnetization losses in a real transformer. Transformerreport project report electrical engineering. Video lecture on open circuit test and short circuit test on transformer of chapter single phase transformer of subject basic electrical engineering for.
The rated voltage is applied to the primary and its two terminals are marked as. Polarity testing of transformers is vital before connecting them in parallel. A transformer is a static apparatus used to transform a. To study the characteristics of the single phase transformer. The tactic relies on a threephase thyristors bridge single rl reactor with the. Electrical machines for mechatronics laboratory 2 9. It can be designed to step up or step down voltages and works on the magnetic induction principle. Basics, maintenance, and diagnostics vii contents continued page 4. Apparatus apparatus functionality ac analog voltmeter a type of pointer instrument that measures voltage in circuits with alternating current.
Transformer is, therefore, an essentialpiece of apparatus both for high and low currentcircuits. To measure single phase power by using three ammeter method. The load test is performed on a single phase transformer, to find out its efficiency and regulation. Pdf a novel transient current limiter based on threephase. Experiment using dc reactor type inrush current limiter are carried out and. Sumpners test on similar transformers and determination of combined and individual transformer efficiency. Theory of operation of singlephase transformers custom. Unit 7 single phase transformers 237 the principles of transformer operation. To study operation of single phase fully controlled rectifier for r load. In the simplest version it consists of two windings wrapped around a magnetic core. Being familiar with operating characteristics of three phase transformers. Normally, transformers are designed to have fixed ratios between the primary and secondary windings.
Operate a single phase transformer offload, with a load applied and with a short circuit applied 2. The performance parameters of the rectifier with a purely resistive load are given by. 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. The various conditions which must be satisfied for the parallel operation of two or more single phase transformers are. Furthermore, this transformer has a power rating of 100va meaning that it can accept a maximum of 100 watts of power. 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. Project report electrical engineering lab introduction transformer a transformer is an electrical device that transfers energy between two or more circuits through electromagnetic induction. The principle of operation of a transformer has been explained in the following simple steps.
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. To measure the single phase power by using three voltmeter method. Sumpners test on similar transformers and determination. To understand the basic working principle of a transformer. Pdf the transformer in flux current may be a transient current that happens in electrical. Theory transformers are arguably the most universally applied pieces of electrical equipment. Department of electrical and electronics experiment 1 single phase fully controlled scr bridge circuit aim. In this method, a resistive load is connected to the transformer and its loaded up to the rated current. A single phase transformer has 480 turns on the primary winding and 90 turns on the secondary winding.
This is a more expensive solution, and it is used in the high voltage power system. 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. Open circuit test and short circuit test on transformer. It is used to change voltages and currents of ac electric power. Reduction of transformer transient inrush current by step voltage. Singlephase transformers electrical and computer engineering. The circuit will have a transformer with a 117v primary and a 25v secondary. The advantages of three single phase units are transportation, maintenance, and spare unit availability. A transformer which increases thevoltages is called a stepup transformer. Otherwise, with incorrect polarity, it is not possible to connect them in parallel. Single phase transformer and applications of single phase. Aim to draw the load characteristics of a given single phase transformer by conducting load test. To experiment in detail on transformers, induction motors, alternators and synchronous motors, and evaluate their performance characteristics.
Video lecture on transformer on load of chapter single phase transformer of subject basic electrical engineering for firstyear engineering students. Open circuit and short circuit tests on single phase transformer. Variable ac source the labs variable ac source shown in figure 4. Short circuit and open circuit test in single phase transformer. Describe the wave shapes observed during part1 of the experiment. The objectives of this experiment are to find the approximate per phase equivalent circuit parameters of a 3. Check proper phasing and voltage of the bank to the system before load is. To study the vi characteristics of an incandescent lamp. 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. Electrical machines for mechatronics laboratory 2 1 experiment 2 single phase transformer i objectives to determine the turns ratio of a single phase transformer. To setup for the opencircuit test, remove the shortcircuit wire on the transformer. The single phase transformer that you will be using in this lab experiment. The working characteristics of a shelltype transistor in noload circuiting condition and short circuit condition are also expected to be tested and understood. In this lab, students will explore the characteristics of a singlephase transformer, including the nonlinear nature of ac excitation and linear models.
Transformer waveforms steadystate testing and performance of single phase transformers report must be the students own work. The maximum value of the magnetic flux density is 1. The following experiments are required to be conducted as compulsory experiments. To determine regulation and efficiency of a single phase transformer using open circuit o.