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sists of three separate devices, each one per-
forming his own task. The three devices are
the following: circuit
breaker,
tension regulator
and current limiter. The task of the
latter,
as
already said, is to avoid that the generator is
required to deliver an amount of current excee-
ding the rated value.
The advantage obtained by the adoption of this
type of regu lator in place of the types with one
or two cores only consists in the fact that the
current limiter, working separately from ten-
sion
regulator,
enables the latter to deliver a
constant current also when load varies. In other
regulator units current limitation is obtained
by battery intervention and this causes tension
yieldings.
Operating features of the three cores
regulator unit are clearly shown on
Fig. 116.
Diagrams on Fig
. 116/
1 show the different ope-
rating stages
.
In diagrams of Fig.
116/
1, position A shows rest
condition
,
when generator is running at low
speed. Position B is when generator reaches
connecting speed (connection with battery)
.
Position C shows the beginning of regulation
and position 0 shows operation of current
limiter in case of overload on generator.
The current limiter enters into action when the
maximum of a predeterm ined current is reached
for instance when there is contemporary inser-
tion of utilizers with a discharged battery. In
the very moment the maximum current is excee-
ded,
the regulator keeper is attracted by the
field electromagnet which is rated for such
maximum. Current limiter contacts
(el)
open
,
thus causing connection of resistance (RRL) in
circuit
(CD)
of generator excitation field
.
When current regulation
begins,
generator ten-
sion lowers and
therefo
re
current
regulator
Fig.
116 - Cutaway view of three-core regulator unit.
84
1}
Cover -
2)
Regulator voltage
coil
-
3)
Voltage resistance -
4)
Regulator and limiter resistance -
5)
Limiter curren
t
coil - 6) Cover gasket -
7)
Regulator securing flange -
8)
Circui
t
breaker contacts -
9)
Circuit breaker current coil -
10)
Battery positive pole terminal
(30/
8
+
) "11
)
Circuit breaker -
12)
Ci
rc
uit breaker keeper - 13) Generator excitation
terminal
(DF/67)
- 14) Limiter keeper -
15)
CUrrent limiter - 16) Limiter contacts -
17) Generator
positive
terminal
(D+ /51
)
-
18)
Tension regulato
r
-
19)
Regu!ator keepe
r
-
.20)
Negative
terminal (0-/
31
)
- 21
)
Regulator contac
ts.
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