The O.C.C. data for separately-excited generator when run at 130 r.p.m. on open circuit is E.M.F. (V) : 12 44 73 98 113 122 127 Exciting current : 0 0.2 0.4 0.6 0.8 1.0 1.2 Deduce the curve of e.m.f. and excitation when the generator is running separately-excited at 1000 r.p.m. To what voltage will the generator build up on no-load when running at 1000 r.p.m.? To what voltage will the generator build up on no-load when running at 100 r.p.m. if the total field resistance is 100 Ω ?
The O.C.C. data for separately-excited generator when run at 130 r.p.m. on open circuit is E.M.F. (V) : 12 44 73 98 113 122 127 Exciting current : 0 0.2 0.4 0.6 0.8 1.0 1.2 Deduce the curve of e.m.f. and excitation when the generator is running separately-excited at 1000 r.p.m. To what voltage will the generator build up on no-load when running at 1000 r.p.m.? To what voltage will the generator build up on no-load when running at 100 r.p.m. if the total field resistance is 100 Ω ?
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The O.C.C. data for separately-excited generator when run at 130 r.p.m. on open circuit is
E.M.F. (V) : 12 44 73 98 113 122 127
Exciting current : 0 0.2 0.4 0.6 0.8 1.0 1.2
Deduce the curve of e.m.f. and excitation when the generator is running separately-excited at 1000 r.p.m.
To what voltage will the generator build up on no-load when running at 1000 r.p.m.? To what voltage will the
generator build up on no-load when running at 100 r.p.m. if the total field resistance is 100 Ω ?
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Е.M.F (V)
If the resistance of the shunt field is 50 2, determine the additional resistance required in the shunt field
circuit to give 240 V at a speed of 1000 r.p.m.
3. Sketch the load characteristic of a d.c. generator with (i) shunt (ii) series excitation. Give reasons
for the particular shape in each case.
The O.C.C. at 700 r.p.m. of a series generator with separately-excited field is as follows :
10
60
120
199
232
248
258
[64.3 Q)
P 28.1.
Characteristics of
D.C. Generators
ET 28.2.
Field current (A)
20
40
50
60
75
Separately-excited
Armature e.m.f. (V) :
Determine the current and terminal voltage as a self-excited series machine when running at 600 r.p.m.
with a load of 6 Q connected to the terminal. Resistance of armature and series winding is 0.32. Ignore effect
of armature reaction.
190
360
410
450
480
Generator
W Fig. 28.1
I Fig. 28.2
T Fig. 28.3
E P 28.3. No-load
[369 V; 61.5 A]
The O.C.C. data for separately-excited generator when run at 130 1.p.m. on open circuit is
E.M.F. (V)
4.
12
44
73
98
113
122
127
Exciting current
0.2
0.4
0.6
0.8
1.0
1.2
Deduce the curve of e.m.f. and excitation when the generator is running separately-excited at 1000 r.p.m.
To what voltage will the generator build up on no-load when running at 1000 1.p.m.? To what voltage will the
generator build up on no-load when running at 100 1.p.m. if the total field resistance is 100 2 ?
5. The following figures give the O.C.C. of d.c. Shunt generator driven at a constant speed of 700
Curve for
Self-excited
Generator
[91 V]
f Fig. 28.4
W Fig. 28.5
W Fig. 28.6
I.p.m.
Terminal voltage (V):
Field Current (A)
10
20
40
80
120
160
200
240
260
0.1
0.24
0.5
0.77
1.2
1.92
3.43
5.2
Determine the critical resistance at (a) 700 r.p.m. (b) 850 r.p.m. If resistance of field coils is 50 2, find
the range of the field rheostat required to vary the voltage between the limits of 180 V and 250 V on open
circuit at a speed of 700 r.p.m.
W 28.4 How to Find
Critical Resistance
[160 Ω; 194 Ω; 70 Ω to 10 Ω]
Rc ?
The O.C.C. of a shunt generator when separately-excited and running at 1000 1.p.m. is given by :
O.C.C. volt :
Field amp. :
6.
EP 28.5 How to Draw
O.C. at Different v
56
112
150
180
200
216
230
0.5
1.0
1.5
2.0
2.5
3.0
3.5
9:04 PM
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A 4) G
721
2/21/2021
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066
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Comment
Field current (A)
0.5
2
3
4
5
Bookmarks
Е.M.F (V)
If the resistance of the shunt field is 50 2, determine the additional resistance required in the shunt field
circuit to give 240 V at a speed of 1000 r.p.m.
3. Sketch the load characteristic of a d.c. generator with (i) shunt (ii) series excitation. Give reasons
for the particular shape in each case.
The O.C.C. at 700 r.p.m. of a series generator with separately-excited field is as follows :
10
60
120
199
232
248
258
[64.3 Q)
P 28.1.
Characteristics of
D.C. Generators
ET 28.2.
Field current (A)
20
40
50
60
75
Separately-excited
Armature e.m.f. (V) :
Determine the current and terminal voltage as a self-excited series machine when running at 600 r.p.m.
with a load of 6 Q connected to the terminal. Resistance of armature and series winding is 0.32. Ignore effect
of armature reaction.
190
360
410
450
480
Generator
W Fig. 28.1
I Fig. 28.2
T Fig. 28.3
E P 28.3. No-load
[369 V; 61.5 A]
The O.C.C. data for separately-excited generator when run at 130 1.p.m. on open circuit is
E.M.F. (V)
4.
12
44
73
98
113
122
127
Exciting current
0.2
0.4
0.6
0.8
1.0
1.2
Deduce the curve of e.m.f. and excitation when the generator is running separately-excited at 1000 r.p.m.
To what voltage will the generator build up on no-load when running at 1000 1.p.m.? To what voltage will the
generator build up on no-load when running at 100 1.p.m. if the total field resistance is 100 2 ?
5. The following figures give the O.C.C. of d.c. Shunt generator driven at a constant speed of 700
Curve for
Self-excited
Generator
[91 V]
f Fig. 28.4
W Fig. 28.5
W Fig. 28.6
I.p.m.
Terminal voltage (V):
Field Current (A)
10
20
40
80
120
160
200
240
260
0.1
0.24
0.5
0.77
1.2
1.92
3.43
5.2
Determine the critical resistance at (a) 700 r.p.m. (b) 850 r.p.m. If resistance of field coils is 50 2, find
the range of the field rheostat required to vary the voltage between the limits of 180 V and 250 V on open
circuit at a speed of 700 r.p.m.
W 28.4 How to Find
Critical Resistance
[160 Ω; 194 Ω; 70 Ω to 10 Ω]
Rc ?
The O.C.C. of a shunt generator when separately-excited and running at 1000 1.p.m. is given by :
O.C.C. volt :
Field amp. :
6.
EP 28.5 How to Draw
O.C. at Different v
56
112
150
180
200
216
230
0.5
1.0
1.5
2.0
2.5
3.0
3.5
9:04 PM
P Type here to search
A 4) G
721
2/21/2021
出
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