Introduction To The Controller; What This Chapter Contains; A Fully Three Phase Individual Controlled Power Factor Controller; Rvt Main Features - Hitachi Abb Rvt Installation Und Betriebsanleitung

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 con-
troller, 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 bal-
anced 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 .
– All the switching parameters may be programmed manually or automatically (description in paragraphs
and 4.3.1)
In addition to the target cos , night target cos  and target cos  in regenerative mode may be programmed
–
(description in paragraph 4.3.1.3).
– For the Three Phase Model RVT12-3P, the controller can be configured to switch on/off single phase capaci-
tor 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

–
Measurements (description in paragraph 4.2).
– Protection against unexpected phenomena and/or unauthorized use (description in paragraphs
4.3.1.1.)
–
Logging of data and alarm messages based on a real time clock (description in paragraphs
– Checking and testing of relays status (description in paragraphs
–
Temperature measurements: max. 8 temperature probes can be connected in daisy chain connection (de-
scription in paragraph 4.3.1.4.3).
1.3.3.

Communications

– Modbus connection (a Modbus RS485 adapter is required)
STATUS
Approved
SECURITY LEVEL
Public
PO WER FACTO R CON TR O LL ER RV T
4.4.2 and 4.4).
DOCUMENT ID
9AKK107045A9645
3.2.4 and
4.2.5 and 4.4).
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4.3.2