Swinburne's test on dc shunt machine theory pdf

The laboratory aids the student on real time to confirm the concepts of theory of dc machines learnt in the previous semester.The course has experiments on all the types of dc generators and dc motors.These experiments consolidates the student's knowledge of construction,operation and performance of dc machines. 3. Load test on DC shunt and compound motor. 4. Load test on DC series motor. 5. Swinburne's test and speed control of DC shunt motor. 6. Hopkinson's test on DC motor - generator set. 7. Load test on single-phase transformer and three phase transformers. 8. Open circuit and short circuit tests on single phase transformer. 9. Motor Output = ω (S1 - S2) x r x9.8 Watt. Now assuming the terminal voltage of DC Motor to be Vt and IL to be the load current then, Power input to the DC Motor = VtIL. Thus the efficiency of DC Motor can be calculated as below. Efficiency = Output / Input. = [ω (S1 - S2) x r x9.8 Watt] / VtIL. For conducting Brake Test on DC Series Motor 1. Open Circuit Characteristic (OCC) of DC shunt generator 2. Load test on DC Shunt Generator 3. Brake test on DC Compound Motor 4. Swinburne's test on DC machine 5. Brake test on DC Shunt Motor. 6. Hopkinson's test. 7. Field's test. 8. Speed Control of DC Shunt Motor. 9. Separation of losses of DC shunt motor. 10. Load test on DC To conduct Swinburne's test on DC shunt machine and to pre determine its efficiency. Apparatus: S.No Name of the Apparatus Type Range No. of required 1 Voltmeter MC (0-300)V 1 2 Ammeter MC (0-2)A 1 (0-5)A 1 3 Rheostat Wire wound 350Ω/1.1A 1 4 Tachometer 1 5 Connecting wires Required 6 SPST Switch 1 Swinburne's Test is an indirect method of testing of DC machines. In this method, the losses are measured separately and the efficiency at any desired load is predetermined. Machines are tested for finding out losses, efficiency and temperature rise. For small machines direct loading test is performed. losses in dc shunt motors. In this test, we get total stray losses nothing but the combination of mechanical (friction & windage) and iron losses of the machine. The circuit diagram of retardation test on dc machines shown below. A1, A2 are armature terminals. Figure 5.5.1 Retardation Test on D.C Machine [Source: "'Electric Machinery Theory: Any D.C. motor can be made to have smooth and effective control of speed over a wide range. The shunt motor runs at a speed defined by the expressions. A ZNP 60 Eb ) and Eb =V - IaRa i.e., ) a K V I a R N where A ZP 60 K Since IaRa drop is negligible N α V and ) 1 ND or I f 1 ND THEORY The efficiency of the DC machine can be accurately determined by the regenerative method, normally known as Hopkinson's test. This test overcomes the drawback of Swinburne's test, which does not take any account of the stray load losses occurring in DC machines under loaded condition. 2.11 Need of starter, three point dc shunt motor starter and 4 point starter 2.12 Applications of DC motors 2.13 Faults in dc machines and their retrospective 2.14 Losses in a DC machine 2.15 Determination of losses by Swinburne's test 3. Transformers (single phase) (22 hrs) 3.1 Introduction View PDF Chapter 2 DC Machines 3.1 Introduction Converters that are used to continuously translate electrical input to mechanical output or vice versa are called electric View PDF ELECTROMECHANICAL ENERGY CONVERSION- I LAB To obtain efficiency of a dc shunt m