Page 71 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 28 : Measurement of R, L, C, and PF in AC circuit

Objectives

At the end of this exercise you shall be able to
• draw RLC series circuit diagram
• identify the RLC components and make the connection of RLC series circuit
• measure / calculate the impedance and power factor in AC circuits.

Requirements

Tools/Equipments Materials
• Combination Plier (150 mm, insulated) - 1 No. • PVC insulated copper wire
• Wire stripper (150mm, insulated) - 1 No. 1 sq mm - as reqd.
• Screw driver (150mm, insulated) - 1 No. • Resistance 150 Ω - 1 No.
• Neon tester 75mm, 500V - 1 No. • Inductor 0.43H, 250V, 50Hz - 1 No.
• Voltmeter, MI 0-300 V - 1 No. • Capacitor 2.5µF, 400V - 1 No.
• Ammeter, MI 10 A - 1 No. • Test lamp 60W, 230 V - 1 No.
• Power factor Meter 1ph 10A - 1 No.
• 1 Ph. Auto transformer 0-270 V, 10 A - 1 No.
• Frequency meter 0-60 Hz, 250 V - 1 No.

Procedure

TASK 1 : Identify the RLC components
1 Collect the tools, equipments and materials required for experiment.

2 Note the values of resistor, inductor and capacitor.
3 Observe the terminals & scale of power factor meter.
4 Make the connection of resistance & inductance (RL) series circuit as per circuit diagram.
5 Switch ON the mains and gradually increase the voltage by auto transformer.

6 Take the reading and note down the value of current, voltage and power factor.
7 Switch OFF the supply and disconnect the circuit.

TASK 2 : Connect & test RLC circuit
1 Make the connection of resistance, inductance & capacitance (RLC) series circuit as per circuit diagram.
2 Switch ON the mains and gradually increase the voltage by auto transformer.

3 Take the reading and note down the value of current, voltage and power factor.
4 Switch OFF the supply and disconnect the circuit.
5 Observe the difference between both circuits.

Tabular column
SL Applied voltage VR VL VC Current Power Impedance
No factor

1

2

54