To conduct load test on dc series generator and obtain external characteristics and internal characteristics

Aim

To conduct load test on dc series generator and obtain external characteristics and internal characteristics

Apparatus Required:

Name plate details:-

Motor Generator

Voltage - 220V Voltage - 220V

Current -13.6A Current -13.6A

Speed - 1500 rpm Speed - 1300 rpm

Excitation type –series Excitation type - series

Circuit Diagram:

To find armature resistance:-

To find series field resistance:

Procedure:-

Open circuit test:

1. Make the connections as per the circuit diagram.
2. Ensure that series generator is electrically loaded to its rated capacity before giving supply and starting the machine.
3. Start the motor with the help of 2-point starter.
4. Decrease the resistive load in steps and note down the field current and terminal voltage.

To determine armature and field resistance:-

1. Connect the circuit as per the circuit diagram.
2. Switch on dc supply.
3. Increase the load and note down the voltage and current.

Tabular columns:

Table1:

Table2: Armature Resistance

Table3:Series field winding resistance

Model Graph

Result:Internal and external characteristics of dc series generator are drawn by conducting load test on it.

Precautions:

1. What are the different types D.C.motors?
2. What is the necessity of starter?
3. What is the basic principle of motor?
4. Why the series motor has rising characteristics?
5. What are the applications of series generators?

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