Occ of dc generator
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This document describes an experiment to obtain the magnetization characteristics of a separately excited DC generator. The aim is to find the critical field resistance. The nameplate details and components used like the voltmeter, ammeter, and rheostats are provided. The procedure involves connecting the circuit and bringing the motor-generator set up to rated speed. Readings of generated voltage and field current are then taken at open switch position and as the field resistance is decreased. A table to record readings and a graph are included to present the magnetization characteristics and calculate the critical field resistance.
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Occ of dc generator
- 1. Magnetizationcharacteristicsof SeparatelyexcitedD.C Generator Aim: To obtain the magnetization characteristics and to find Critical field resistance of separately excited D.C generator. Name Plate Details: Motor Generator 1. HP/ KW: 2 HP 1.3 KW 2. Armature Voltage: 220 V 220 V 3. Armature Current: 8A 5.9A 4. Field Voltage: 220 V 220 V 5. Field Current: 0.7A 0.7A 6. Speed: 1500 RPM 1500 RPM 7. Insulation Class: B B Apparatus required: S.No Name of the equipment Range/ Specification Type Quantity 1 Voltmeter (0-300) V MC 1 2 Ammeter (0-1) A MC 1 3 Rheostat 100Ω, 5A 290Ω, 2.5A 600Ω, 1.7A Wire wound ,, ,, 1 1 1 4 3-Point starter - - 1 5 Tachometer 60-1,00,000 RPM Digital 1 6 Connecting wires 1.5sqmm Copper Adequate Procedure: 1. Connect the circuit as shown in the circuit diagram. 2. Keep the switch S1 in open position. 3. Keep the field rheostat of the motor at its minimum position and the Armature rheostat of the motor, field rheostat of the generator should be at their maximum position. 4. To start the motor, close DPST switch and move the starting arm of the 3- point starter slowly in clockwise direction. 5. Then bring the motor-generator set to its rated speed (1500 RPM) by first decreasing the armature resistance and then by increasing the field resistance of the motor.
- 2. 6. Now note the generated voltage (i.e. Residual voltage) and the corresponding field current at S1 in open position. 7. Now close switch S1 and by slowly decreasing the resistance connected in series with the field winding of generator, note down the output voltage and the corresponding field current of the generator until the generated voltage becomes 120% of its rated value.
- 4. Tabular column: S No Field Current (If) Generated Voltage (Eg) Model graph: Theoretical calculations: Critical field resistance at rated speed RC = E1 / If1 Precautions: 1. Connections should be tight 2. Check the connections before switching on the supply 3. Readings should be taken without parallax errors. Result: