GE6162-ENGINEERING PRACTICES LABORATORY Experiments Group B
Electrical Engineering Practice
1.Residential House Wiring
Aim -
To construct the residential house wiring using switches, fuse, indicator, lamp and energy meter.
Materials required
1. Incandescent lamp holder 1 no
2. Incandescent lamp1 no
3. Ceiling Fan Setup 1no
4. Regulator 1 no
5. Single way switch - 10 Amps 3no
6. Wooden box 7X8 inch 1no
7. Connecting wires As required
8. Main switch - 10amphs -1no
9. 1-Ø Energy meter 1no
10. Indicator 5 Amps 1 no
2. Incandescent lamp1 no
3. Ceiling Fan Setup 1no
4. Regulator 1 no
5. Single way switch - 10 Amps 3no
6. Wooden box 7X8 inch 1no
7. Connecting wires As required
8. Main switch - 10amphs -1no
9. 1-Ø Energy meter 1no
10. Indicator 5 Amps 1 no
Circuit Diagram
Theory :
Above circuit diagram is showing the Residential House Wiring where it is consist of Lamp, Fan Indicator ,Switch with Energy Meter.
It is an example of Residential House Wiring where the fuse is utilized for the Protection purpose and the indicator is used for indicating the power.
Procedure:
Power supply is in off condition.
As per the given diagram connection were connected.
connections were verified by the Lab Instructor.
Switch on the Power supply.
after verification as per the Table readings are taken and verified.
Power supply is switched off position.
Connections were disconnected.
Result :
As per the given diagram reading are taken.
2.FLUORESCENT LAMP WIRING
Aim -
To check and assemble the accessories of a tube light.
Materials required:
Fluorescent lamp - 40 watts 1 no
Starter -1 No
Choke coil - 1 No
Wood screws - as required
Connecting wires as required
Circuit Diagram
Theory :
Above circuit diagram is showing the FLUORESCENT LAMP Circuit Diagram which consist of starter ,Fluorescent lamp,Choke and switch.
Procedure:
Power supply is in off condition.
As per the given diagram connection were connected.
connections were verified by the Lab Instructor.
Switch on the Power supply.
after verification as per the Table readings are taken and verified.
Power supply is switched off position.
Connections were disconnected.
Result :
As per the given diagram reading are taken.
3.STAIR-CASE WIRING
AIM
To construct a
staircase wiring in which one lamp controlled by two switches.
Materials required:
Incandescent Lamp holder 1 no
Incandescent Lamp40 watts 1no
SPDT switches 2nos
Connecting wire As required
Circuit Diagram
Theory :
Above circuit diagram is showing the Stair Casing circuit Diagram,where we can control the load from two separate areas.
for that here two SPDT switches were used in this circuits
Procedure:
Power supply is in off condition.
As per the given diagram connection were connected.
connections were verified by the Lab Instructor.
Switch on the Power supply.
after verification as per the Table readings are taken and verified.
Power supply is switched off position.
Connections were disconnected.
Verify the Position of the
switch(s1) Position of the switch(s2) Condition of lamp (L)
i.e Switch s1 & Switch S2 both are in ON condition.
Switch s1 in ON condition & Switch S2 in OFF condition
Switch s1 in OFF condition & Switch S2 in ON condition
Switch s1 in OFFcondition & Switch S2 in OFFcondition
Result:
Thus the staircase wiring for the bulb was prepared and
tested.
4.MEASUREMENT OF ELECTRICAL QUANTITIES VOLTAGE, CURRENT,
POWER & POWER FACTORING RLC CIRCUIT
Aim
To measure the electrical measurement of electrical
quantities -voltage, current, power and power factoring RLC circuit.
Apparatus required
Voltmeter (0-300 )V MI 1no
Ammeter (0-2)A 1no
Watt meter 5AMPS/250V 1no
PF meter 5A/250V 1no
Ohm meter 1 KΩ 1no
Auto-transformer 1no
Rheostat 1k Ω/1A 1no
Variable Inductor -1no
Variable Capacitor - 1no
Theory :
Above circuit diagram is showing the Measuring circuit
diagram of Various parameters such as Current,Voltage,Power and Power Factor of
the given RLC units
PRECEDURE:
Connections are made as per the circuit diagram.
Set the auto transformer to have a zero output.
Gradually increase the output voltage until its 100v.
Measure the corresponding current .note down the reading
in the given table. Also read the watt meter and the power factor meter and
record in table.
Calculate the apparent power from the voltmeter and
ammeter readings.
Apparent power= V X I
COS Ø =True power/apparent power
Verify the measured power factor with the calculated
power factor.
Increase the voltage to 200v and repeat the above steps 4
to 7 times.
RESULT
Thus the R-L-C circuit voltage, current, power and power
factor are measured and values are calculated.
5.Measurement of resistance to earth of electrical equipment
AIM
To measure the earth resistance of given electrical
equipment example transformer.
Apparatus required
Transformer 0-230v/110v 1no
Megger 1no
DPST 1no
Theory :
Above circuit diagram is showing the Measurement of Resitance to the Earth using the Megger.Here we going to take the Transformer as our electrical Equipment.
Procedure
Connections are given as per the circuit diagram.
The DPST should keep open.
Supply the desired voltage to megger for its operation for one minute.
Take the readings of megger.
Repeat the step 3 for at least five times take the
average value. The average value gives the earth resistance of the given
transformer.
Result:
Thus the earth
resistance of the given transformer was found by using megger.
6.MEASUREMENT OF ENERGY USING SINGLE PHASE ENERGY METER.
AIM:
To calibrate the
given single phase energy meter at unity and other power factors
Apparatus Required
Energy meter – 1
No
Wattmeter – 1 No
Stop watch – 1 No
M.I Ammeter – 1
No
M.I Voltmeter – 1
No
PROCEDURE:
Connections are given as shown in the circuit diagram.
Supply is switched ON and load is increased in steps,
each time noting the readings of ammeter and wattmeter.
Also the actual time taken for 1 revolution of the disc
is measured using stop watch.
Step 2 is repeated till rated current of the energy meter
is reached.
% Error is calculated and calibration curve is drawn.
CALCULATION:
Let x revolution / kwh be the rating.
Now x revolution = 1 kwh
= 1*
3600*1000* watt-sec.
Constant k of energymeter
= 3600 * 103 /x watt-sec
For each load indicated power Wi is given as Wi = k/t
watts
Where
K= energymeter constant (watt-sec)
T= time for 1 revolution(sec).
Actual power is indicated by the wattmeter reading.
% error = Wi-Wa/Wi* 100.
It can be zero +ve or –ve.
RESULTS:
From the
calibration curve it is possible to predict the error in recording the energy.
So the correction can be applied to the energy meter reading so that correct
energy reading can be obtained and used.
