What are the characteristics of separately excited DC generator?
The external characteristic of the separately excited DC generator is obtained by subtracting the drops due to ohmic loss (Ia Ra) in the armature from generated voltage (Eg). Terminal voltage(V) = Eg – Ia Ra. This curve gives the relation between the terminal voltage (V) and load current.
What are the characteristic curves are drawn in DC generator characteristics?
An internal characteristic curve shows the relation between the on-load generated emf (Eg) and the armature current (Ia). The on-load generated emf Eg is always less than E0 due to the armature reaction.
What is a separately excited DC generator?
A separately excited DC generator is the one whose field winding is supplied by an independent external DC source (like a battery). The magnitude of generated voltage depends upon the speed of rotation of armature and the field current, i.e., greater the speed and the field current, higher is the generated voltage.
What are the characteristics of a DC generator?
Characteristics of DC Generators
- Open Circuit Characteristics or Magnetisation Curve.
- Internal Characteristics.
- External Characteristics or Load Characteristics.
- Open Circuit Characteristics (O.C.C)
- Internal Characteristics.
- External Characteristics or Load Characteristics.
- Open Circuit Characteristics.
What is the difference between separately excited and self excited DC generator?
In a separately excited (S.E.) machine, the field winding is connected to a separate voltage source while, in a self excited generator field winding is connected across the armature terminals (provides its exciting current) .
What is separately excited?
Definition of separately excited : having the field magnets excited by a current from a separate source —used of a machine.
What is separately excited DC motor?
A separately excited dc motor is a motor whose field circuit is supplied from a separate constant-voltage power supply, while a shunt dc motor is a motor whose field circuit gets its power directly across the armature terminals of the motor.
What is the difference between separately excited and self excited generator?
What is separate excitation?
What is OCC curve of DC shunt generator?
The open circuit characteristics (O.C.C) or magnetization characteristics is the curve that shows the relationship between the generated EMF at no-load (E0) and the field current (If) at constant speed. It is also known as no-load saturation curve.
What is the advantage of separately excited DC motor?
Separately excited DC motor can operate above the base speed in the field-weakening region by reducing the field current independently. Also its speed direction can be reversed by reversing the armature voltage.
What is separately excited and self excited?
What is the advantage of separately excited dc motor?
What are OCC characteristics?
What is meant by separately excited DC motor its classification?
What is difference between separately excited and self excited DC generator?
What is OCC and SCC curve?
Open circuit characteristic (OCC) and Short Circuit Characteristics (SCC) of a Synchronous generator. With the armature terminals open, Ia=0, so Eg = Vt It is thus possible to construct a plot of Eg or Vt vs If graph.