Page 195 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 80 : Start and run, build up voltage and load
MG set

Objectives

At the end of this exercise you shall be able to:
• record the name plate details of alternator
• connect an alternator with separate excitater,ammeter and voltmeter
• plot the open circuit charactered by varring voltage
• load the alternator and record readings.

Requirements

Tools/Instruments Materials

• Electrician Tool kit - 1 No. • ICTP switch 16A 500V - 1 No.
• MI Voltmeter 0-500V - 1 No. • Lamp holder pendent - 2 Nos.
• MIAmmeter0-15A - 1 No. • Lamp 250V, 60 or 100 watts bulb - 2 Nos.
• MC Ammeter 0 to 2.5A - 1 No. • Stranded PVC insulated wire 7/1.5
• MCAmmeter 0 to 15A - 1 No. aluminium cable -as reqd.
• MCVoltmeter 0 to 250 volt - 1 No. • D.P.S.T. Switch 16A, 250V - 1 No.
• Power factor meter 500V • PVC insulated connecting cable - 1 No.
15A 0.5 lag to 0.5 lead - 1 No. • ICDP switch 16A 250V - 1 No.
• Tachometer multi-range • Graph sheet - 1 No.
0-300/1000/3000 rpm - 1 No.
Equipments/Machines
• DC Shunt Motor 5 HP, 440V - 2 Nos.

Procedure

TASK 1:Record the name plate details of alternator
1 Draw the connection diagram of the alternator coupled to DC shunt motor.
2 Note down the name plate details of the 3Ф Alternator and DC shunt Motor.

TASK 2: Connect an alternator with separate excitater,ammeter and voltmeter
1 Test and identify the terminals of the Alternator.
2 Connect the prime mover as per the circuit diagram.(Fig 1)

3 Connect the alternator as per circuit diagram.
4 Wire up the exciter as per diagram.
5 Start prime mover.

178