Machine Manual - Exersize no1

Laboratory Exercise 1

OBJECT:

Determine the transformation ratio of the given Transformer.

APPARATUS: Power transformer(500VA,220/220V,single phase, shell type). Power pack, AC ammeter(' OA) AC voltmeter(600V) ,connecting leads.

THEORY:

The transformation ratio is defined as the ratio between the HV side and the LV side rating of the transformer under no load conditions. This ratio is some times needed in some calculations such as in referring in over all impedance of one side. Donating by the parameter K we have

K=VIN2
Vi=voltage of HV side
V2^--voltage of LV side.

Under no load condition this is equal to the voltage ratio of the HV windings to the LV windings.

Thus                                                            K=VI/V2=1\11/N2.

PROCEDURE:

·      Make connections of the HV side of the given transformer as shown.

·        Set the power pack selector switch and make sure that the variator is rotated fully counter clockwise.

·      Note down the readings of the secondary.

·      Repeat this for the single windings of the secondary.

OBSERVATION TABLE:

Conditions	S.No	Primary yoltage(Vp)	Secondary voltage(Vs)	Kv=Vp/Vs	Ky
Secondary windings in series	1	180V
	2	200V
	3	220V
Single - Secondary windings	1	180V
	2	200V
	3	220V

CALCULATION:

Lab it 1 Quiz

1.    What is the difference between Primary and Secondary transformer?

2.    What are the types of transformer?

3.    What are the applications of transformer?

4.    A transformer has 2000 windings on the primary coil and 1000 windings on the secondary coils, input voltage is 12v what is output voltage.