The open circuit terminal voltage versus the field current (open circuit characteristics) for a separately excited dc
Posted: Sun May 15, 2022 2:20 pm
The open circuit terminal voltage versus the field current (open circuit
characteristics) for a separately excited dc generator driven at 1000 rpm is
given below:
𝑰𝒇
(A) 0 0.1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2
𝑬𝒈(V) 12 16 30 55 75 90 100 110 115 120 122 123
Assume the machine is connected as a shunt generator and driven at 100
rpm and has a field resistance of 100Ω,
a. Use excel spreadsheet to draw the open circuit characteristics from the
given data
b. Determine the open circuit voltage and exciting current of the shunt
generator
c. Find the critical resistance with the help of the graph
d. Find the resistance to induce 105V with the help of the O.C.C.
characteristics) for a separately excited dc generator driven at 1000 rpm is
given below:
𝑰𝒇
(A) 0 0.1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2
𝑬𝒈(V) 12 16 30 55 75 90 100 110 115 120 122 123
Assume the machine is connected as a shunt generator and driven at 100
rpm and has a field resistance of 100Ω,
a. Use excel spreadsheet to draw the open circuit characteristics from the
given data
b. Determine the open circuit voltage and exciting current of the shunt
generator
c. Find the critical resistance with the help of the graph
d. Find the resistance to induce 105V with the help of the O.C.C.