ITB RAV-2 - Overcurrent Lock; Actuation Mode in Case of Inverse Flow


Single Phase Voltage Regulator RAV-2
with control CTR-2
Instruction Manual MI-010
Page: 21/27
Rev. 06/2017
The lower voltage limit (Vmin) is the result of subtracting the value of the reference voltage to establish the map
active (VREFv) the value set for the insensitivity of the active map (INSv) and the lower limit set in function 40
(LVMIN).
So:
Vmin = VREFv - INSv – LVMIN
Superior voltage limit (Vmax) is the resulting from adding voltage reference to establish the map active (VREFv) with
the value set for the insensitivity of the active map (INSv) and the lower limit established in function 41 (LVMAX).
So:
Vmáx = VREFv + INSv + LVMAX
42 – Overcurrent lock
This parameters sets regulator to avoid tap changes in case current is above a desired value so as to avoid
damages to drive, contacts, etc. When measured current exceeds nominal current value multiplied by the factor set
on this parameter, control will avoid tap changes.
43 - Actuation mode in case of inverse flow
This parameters sets the way CTR-2 control Works when inverse power flow is detected.
Table 11 shows the value of parameter 43 set and the way regulator works.
Table 11: Description of how regulator Works depending on detected flow sense
Firmware
Name Action
Functional Diagram
>2.5 =2.5 <2.5
0 0 0
Works on
direct flow and
locks in
inverse flow
Works only in direct flow. To be used only
when there is no possibility of inverse flow.
For security reasons If CTR-2 detects an
inverse current bigger than 1% of regulator
nominal current, tap changer is locked until
current is once again 1% or bigger but in
direct flow
1 3 3
Works on
direct flow and
neutralizes
when in
inverse flow
In case of inverse 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
direct power flow is detected. When an
inverse power flow bigger than the 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 direct power flow .where it regulates on
direct power flow
2 5 -
Constant direct
power flow
Works only in direct power flow even though
an inverse power flow is detected. This has to
be used when no inverse power flow can
happen
ITB - Equipamentos Elétricos Ltda.