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Product documentation 1D 3.8.en Rev. E, 10/13 page 39/42
7 Regulation
7.1 General description, control principle
The purpose of the control system is to maintain a constant terminal voltage on the main machine
irrespective of the load and the power factor. Voltage regulator measures generator voltage and compares it
with the adjusted value. Exciter winding obtains the required direct current via voltage regulator actuator
which is fed by an auxiliary winding inside the main machine stator. The three-phase winding of the exciter
feeds the main machine rotor via rotating rectifiers. A varistor restricts voltage peaks to permissible values.
A specific model of the voltage regulator used . its connection and description are given in the Annex to
Operating Instructions. On request the generator can be additionally equipped with power factor cos ϕ ,
whose details are also given in the Annex.
Compact voltage regulators are moisture- and vibration-resistant. Generator self-excitation is provided by a
sufficiently high remanence in exciter stator.
Fig. 15 Regulation
L2 L1 L3 LH ROTATION (SWITCH OVER TERMINALS TO A1 OF CURRENT TRANSFORMER)
L1 L2 L3 RH rotation
A1
A1 regulator
F1 fuse
G1 main machine
G2 exciter
H auxiliary winding
R1 external potentiometer
T1 current transformer
U varistor
V2 rectifier
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