Page 189 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 78 : Calculate load regulation & performance
Efficiency

Objectives

At the end of this exercise you shall be able to:
• draw circuit and connect the alternator as per circuit diagram
• load the alternator and observe the variation of voltage
• find the regulation of alternator.
Requirements

Tools/Instruments
• Combination pliers 150mm -1 No. • 3 phase induction motor 7.5HP -1 No.
• Screw driver 100mm -1 No. • Lamp load 5KW -1 No.
• D.E. spanner set 5 – 20mm -1 set. • ICDP 16A,240V -1 No.
• Electrician’s knife 75mm -1 No. Materials
• Series test lamp 60W -1 No. 2
• Voltmeter MI 0 – 300V -1 No. • PVC Copper wire 6mm -18m.
• Ammeter MI 0 – 10A -1 No.
Equipments/Machines
• 1Ф Alternator 5KVA, 240V

Procedure

TASK 1: Draw circuit and connect the alternator as per circuit diagram
1 Note down the name plate details of the 3Ф Alternator and prime mover

2 Draw the circuit diagram.
3 Make the connections as per circuit diagram.(Fig 1)

TASK 2: load the alternator and observe the variation of voltage
1 Start the prime mover and run the alternator.
2 Switch ON the lamp load one by one.
3 Note down the voltmeter and ammeter readings.
4 Tabulate the readings. Table 1

172