# Regulation & Efficiency Test of Single-phase Transformer by Direct Loading Method

Experiment No.: 5

Experiment Name:

Determine the regulation & efficiency of single-phase transformer by direct loading method.

Objective:

To determine

1. Regulation of single-phase transformer by direct loading method
2. Efficiency of single-phase transformer by direct loading method

Theory:

Although two chief difficulties which do not warrant the testing of large transformer by direct load test are:

1. Large amount of energy has to be wasted in such a test.
2. It is stupendous (impossible for large transformer) task to arrange a load large enough for direct loading. Yet this test can be performed to find out the efficiency & voltage regulation of small rating transformers.

Efficiency, Î· = Output Power / Input Power

% Î· =((P2) / (P1)) Ã— 100

% Voltage regulation up= ((No load voltage – Full load voltage)/Full load voltage)Ã—100

% Voltage regulation down= ((No load voltage – Full load voltage)/No load voltage)Ã—100

Circuit Diagram:

Observation Table:

Calculation:

Apparatus Used:

Remarks: This method is not applicable for large rated transformer as a large amount of energy has to be wasted in such a test. During this test we should cautious about the heat radiated by the resistive load.

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