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1 Introduction to the controller
1.1 What this chapter contains
This chapter gives a general description of the power factor controller RVT. It illustrates
the basic structure of the controller, major features and the touch screen user interface
of the controller.
1.2 A fully three phase individual controlled power factor controller
The RVT controller is able to fulfil power factor compensation in both balanced and
unbalanced network. There are two models for RVT controllers: RVT Base Model
RVT6/RVT12 and RVT Three Phase Model RVT12-3P. The Base Model is fully backward
compatible to previous RVT controllers with 6 or 12 outputs, which is applicable for a
balanced three phases or single phase (phase to phase) network. The Three Phase Model
RVT12-3P is a more powerful version with individual phase power factor controlling
functions thanks to three CT measurements for each phase. The Three Phase Model
RVT12-3P has 12 outputs execution only.
The RVT can also be used for MV automatic capacitor bank. Details on how to connect
RVT to a MV bank can be found in 4.3.1.1.
1.3 RVT main features
1.3.1
Power factor correction control
The RVT Power Factor Controller is the control unit of an automatic capacitor bank which
is used to fulfil reactive power compensation in an installation with prevailing inductive
loads.
It performs the switching of capacitors in order to reach a user-defined target cos j.
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All the switching parameters may be programmed manually or automatically
(description in paragraphs
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In addition to the target cos j, night target cos j and target cos j in regenerative
mode may be programmed (description in paragraph 4.3.1.3).
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For the Three Phase Model RVT12-3P, the controller can be configured to switch
on/off single phase capacitor in an unbalanced network. This function is used to
correct the low power factor in each individual phase; for instances, power factor
0.6 in Phase1, power factor 0.8 in Phase2, power factor 0.95 in Phase3. It is very
practical for some residential/commercial area where the three phase loads can
be unbalanced due to many single phase loads.
1.3.2
Measurements and monitoring
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Measurements (description in paragraph 4.2).
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Protection
(description in paragraphs
6 Introduction ç Manual Power Factor Controller RVT
4.3.2
and 4.3.1)
against
unexpected
3.2.4
and 4.3.1.1.)
phenomena
and/or
unauthorized
use
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