In this post, we will learn the characteristics of a series wound dc generator. This article is the continuation of the dc generator characteristics.
The connection diagram of a series wound generator is shown in figure (i) below.
The open circuit, internal and external characteristics of series wound dc generators are discussed here.
|Characteristics of Series Wound DC Generators|
Open circuit characteristic
Curve 2 shows the total or internal characteristic of a series generator.
It gives the relation between the generated e.m.f. E. on load and armature current.
Due to the armature reaction in dc generator, the flux in the machine will be less than the flux at no load.
Hence, e.m.f. E generated under load conditions will be less than the e.m.f. E generated under no load conditions.
Consequently, the internal characteristic curve lies below the O.C.C. curve; the difference between them representing the effect of armature reaction.
External or Load characteristic
Curve 3 shows the external characteristic of a series generator.
It gives the relation between terminal voltage and load current I.