Page 186 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 77 : Demonstrate build up voltage, excitation,
loading Characteristics

Objectives

At the end of this exercise you shall be able to:
• draw the circuit diagram and read the name plate details
• connect start and run the motor
• set the voltage and frequency to rated value
• plot the load characteristics of the alternator with lamp.
Requirements

Tools/Instruments
• Combination pliers 150mm -1 No. • DOL starter 3HP, 440V -1 No.
• Screw driver 100mm -1 No. • ICTP 16A, 440V -1 No.
• Electrician’s knife 75mm -1 No. Equipments/Machines
• Tachometer 0-10000rpm -1 No.
2
Equipments/Machines • PVC Copper wire 2.5mm -18m.
• 4 core cable 650-1100V -1 No.
• 3Ф Induction Motor 3kVA,
415V,50Hz -1 No.
• Variable DC Power Supply
0-260V, 10A -1 No.
Procedure

TASK 1: Read,Enterpret record the name plate detail of the motor
1 Note down the name plate details of the DC shunt Motor and the Alternator.

2 Draw the circuit diagram to run the Alternator and to measure the voltage and frequency.(Fig 1)

Fig 1

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CITS : Power - Electrician & Wireman - Exercise 76