POWER DRIVE SYSTEMS
DUNLITE UVR100 AUTOMATIC VOLTAGE REGULATOR
7
DROOP FACILITY
Terminals D1 D2
The UVR100 regulator has quadrature droop facilities for parallel operation.
The addition of a drooping kit will make the UVR100 suitable for parallel operation.
Quadrature droop allows load sharing of reactive load (kVAR) only, since kW load sharing is a function of
the prime mover.
Part of the droop kit will be a class 2.0 (Australian Standard C388) ring current transformer, with 5A 10
(ten) VA secondary rating and ratio to suit twice the alternator output. This current transformer must be
placed in the Blue phase. It is to be noted that the UVR100 senses Red and White phase voltage and to
achieve quadrature droop, current must be sensed in the Blue phase. See diagram.
Nominal value of fixed resistor 'Rl' is 1 ohm 20W and of adjustable potentiometer 'R2’ 30 ohm 2W. These
values are subject to change, dependant on the number of alternators to be paralleled, and advice should
be obtained from the factory in this regard.
R2 must be adjusted on both plants for kVAR load sharing.
See 'Parallel Operation’ Appendix C.
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