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Basler SR8A voltage regulator
The Basler SR8A voltage regulator is from the family of SR-A static voltage regulators. The
voltage regulator is a static type that has no electrolytic capacitors. Specifically, the SR8A is
used in applications requiring a 125 VDC field and 7 amperes maximum field current. The SR8A
can be used in all three types of excitation systems (brushless rotating exciter, brush-type
rotating exciter, and static exciter). Of the three types, the SR8A is most commonly used as part
of a brushless excitation system. For nuclear EDG applications, the SR8A is used only as part of
a brushless excitation system. In the nuclear industry to date, SR8As have been provided with
EMD and Cooper-Bessemer engines.
For this type of excitation system, the exciter is enclosed within the generator housing and is
mounted on the same shaft with the generator field windings. A rotating rectifier (sometimes
diode wheel) is also mounted on the generator shaft.
Exciter field current is controlled by the SR8A voltage regulator, which can be varied as
necessary to maintain the required generator output voltage. The brushless excitation system
utilizes an AC exciter whose armature windings are mounted on the generator shaft, and the
exciter field windings are mounted on the stator. The regulator controls the amount of field flux
(proportional to field current) associated with the field windings. The rotation of the prime
mover creates relative motion between the field flux and the rotating exciter armature windings.
The AC output from the exciter armature windings is rectified by a rotating rectifier bridge and
supplied directly to the generator field windings (see Figure 2-1). This greatly simplifies and
reduces generator maintenance because it eliminates collectors, brushes, and brush riggings.
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