ITB RAV-2 - Page 23


Single Phase Voltage Regulator RAV-2
with control CTR-2
Instruction Manual MI-010
Page: 22/27
Rev. 06/2017
Firmware
Name Action
Functional Diagram
>2.5 =2.5 <2.5
3 1 1
Works on
inverse power
flow y locks in
direct power
flow
Works only in inverse power flow. To be used
only when there is no possibility of direct flow.
For security reasons If CTR-2 detects a direct
current bigger than 1% of regulator nominal
current, tap changer is locked until current is
once again 1% or bigger but in inverse power
flow
4 7 -
Works in
inverse power
flow and
neutralizes in
direct flow
In case of direct power flow detection tap
changer will automatically go to zero position
and lock there. This configuration must be
used where direct and inverse power flow
can occur, but only want to regulate when
inverse power flow is detected. When an
direct power flow bigger than the percentage
value set on parameter 49 Lock limit (LIMBL)
tap changer is taken into neutral position and
operations are locked until current is once
again equal to or bigger than same value but
on inverse power flow .where it regulates on
inverse power flow
5 6 -
Constant
inverse flow
Works on inverse power flow, even when a
direct power flow is detected. Must be used
only when no direct power flow can happen
6 - -
Bidirectional
locked for
currents less
than limit
Regulates on both power flow senses. To be
used when direct and inverse power flow can
happen. IF CTR-2 control detects a current
bigger than the percentage value of nominal
current set in parameter 49, Lock limit
(LIMBL), power flow sense is analyzed and
operates regulating according to power flow
sense. In currents less than Locl Limit, tap
changer is kept without actions and in same
tap position that it was when condition si
given.
For equipments in DELTA, source voltage
has to be measured by external VT
7 2 2
Bidirectional
active until the
opposite limit
Regulates in both flow ways. It must be used
in conditions where there is the possibility of
direct and inverse power flow. The controls
CTR-2, operate in direct flow until the current
in inverse flow is superior to the percentage
value of the rated current programmed on
screen 49, Blocking Threshold (LIMBL). From
this point on they start to work in inverse flow
and they stand like this until the current in
inverse flow is higher than the blocking
threshold programmed on screen 49. For
DELTA banks, the voltage on the SOURCE
must be measured by external PT.
ITB - Equipamentos Elétricos Ltda.