Open circuit (or) No load characteristics of dc shunt generator
- To get this characteristic, dc shunt generator is run with its load circuit open at constant speed.
- The excitation current through field winding is increased from zero and the emf. induced at ach value of the field current is noted.
- Then the graph is plotted taking field current along X axis and the induced emf. along the Y axis.
- This characteristic is also called as magnetization characteristics of dc shunt generator
- When the field current is less, the induced emf. will be directly proportional to the field current and it increases along the straight line AC as shown in the figure.
- When the field current is increased beyond certain level its field magnet gets saturated.
- Therefore the induced emf. will not increase proportion to the field current, and it is increases along the curve CD as shown in he above figure.
No comments:
Post a Comment