LOAD TEST ON A SINGLE PHASE TRANSFORMER - Computer Programming

# Computer Programming

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## Monday, April 4, 2011

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 MIMI 11 2 Voltmeter (0-150)V(0-300) V MIMI 11 3 Wattmeter (300V, 5A)(150V, 5A) UpfUpf 11 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 InputPowerW1 x MF Output PowerW2 x MF Efficiencyh% %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 MIMI 11 2 Voltmeter (0-150)V MI 2 3 Wattmeter (150V, 5A)(150V, 5A) LPFUPF 11 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.