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Monday, April 4, 2011

LOAD TEST ON A SINGLE PHASE TRANSFORMER


LOAD TEST ON A SINGLE PHASE TRANSFORMER

AIM:
To conduct load test on single phase transformer and to find efficiency and percentage regulation.

APPARATUS REQUIRED:
S.No.
Apparatus
Range
Type
Quantity
1
Ammeter
(0-10)A
(0-5) A
MI
MI
1
1
2
Voltmeter
(0-150)V
(0-300) V
MI
MI
1
1
3
Wattmeter
(300V, 5A)
(150V, 5A)
Upf
Upf
1
1
4
Auto Transformer
1f, (0-260)V
-
1
5
Resistive Load
5KW, 230V
-
1
6
Connecting Wires
2.5sq.mm
Copper
Few

PRECAUTIONS:
  1. Auto Transformer should be in minimum position.
  2. The AC supply is given and removed from the transformer under no load condition.

PROCEDURE:
  1. Connections are made as per the circuit diagram.
  2. After checking the no load condition, minimum position of auto transformer and DPST switch is closed.
  3. Ammeter, Voltmeter and Wattmeter readings on both primary side and secondary side are noted.
  4. The load is increased and for each load, Voltmeter, Ammeter and Wattmeter readings on both primary and secondary sides are noted.
  5. Again no load condition is obtained and DPST switch is opened.



TABULAR COLUMN:


S.No.
Load
Primary
Secondary
Input
Power
W1 x MF
Output Power
W2 x MF
Efficiency
h
%
%
Regulation
V1
(Volts)
I1
(Amps)
W1
(Watts)
V2
(Volts)
I2
(Amps)
W2
(Watts)


















































FORMULAE:                                   
Output Power = W2 x Multiplication factor
Input Power = W1 x Multiplication factor
                                    Output Power
Efficiency h %     =  -------------------- x 100%
                                     Input Power            
                                    VNL - VFL (Secondary)
Regulation R %   =  ------------------------------   x  100%
                                                  VNL
MODEL GRAPHS:



 










RESULT:
            Thus the load test on single phase transformer is conducted.                      

Ex.No. 13             
OPEN CIRCUIT & SHORT CIRCUIT TEST ON A
SINGLE PHASE TRANSFORMER
AIM:
To predetermine the efficiency and regulation of a transformer by conducting open circuit test and short circuit test and to draw equivalent circuit.

APPARATUS REQUIRED:
S.No.
Apparatus
Range
Type
Quantity
1
Ammeter
(0-2)A
(0-5) A
MI
MI
1
1
2
Voltmeter
(0-150)V
MI
2
3
Wattmeter
(150V, 5A)
(150V, 5A)
LPF
UPF
1
1
4
Connecting Wires
2.5sq.mm
Copper
Few

PRECAUTIONS:
  1. Auto Transformer should be in minimum voltage position at the time of closing & opening DPST Switch.

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