Single Phase Voltage Regulator RAV-2
with control CTR-2
Instruction Manual MI-010
Page: 24/27
Rev. 06/2017
current, "1" when the current leads ahead by 30 ° in reference to the voltage, or "2", when the current lag was
delayed by 30 ° in reference to the voltage.
For regulators installed between phase and neutral.
When connected phase to neutral, the "DEFVC" function must necessarily be set to "0" or that corresponds to the
condition that no phase shift between voltage and current when a purely resistive load is considered. This situation
occurs in grounded wye and single phase regulation.
Regulators between phases
When the controller is connected between phases as in delta connections , " Def" parameter has to be set by user
on CTR -2 to " 1" or "2 " because it cannot be set to "0”.
The CTR -2 controls can help user make that determination, being enough to do:
Regulator is connected;
There is enough current to be measured;
The steps described here are followed:
1.Put switch "NORMAL / DISCONNECT / EXTERNAL " key into the " NORMAL" position;
2.SET " DefVC " CTR -2 function control to "1";
3.Read and record the value of the power factor indicated by the CTR -2 control ;
4.Set " DEFVC " CTR -2 function control to "2" ;
5.Read and record the value of the power factor indicated by the CTR -2 control ;
6.Choose between the two values for the power factor that which seems reasonable and set the " DEFVC " function
in CTR -2 control to that value (1 or 2 ).
Repeat the above procedure for the other regulators from the bank and observe that for banks in open delta, one of
the regulators keep a " DEFVC " function set to "1" and the other "2" and, for banks closed delta, adjusting the "
DEFVC " function for a two regulators will be repeated in the other .
47 - Optional source voltage measurement
In CTR-2 controls, voltage on source side can be measured by setting parameter 47 in “1” or calculated when
parameter is set to “0”. If selection is to be measured, an external Voltage Transformer has to be installed in source
side with secondary connected between terminal block 26 and earth of terminal blocks in control box. Relation of this
VT has to be such that 3Va will be achieved when nominal tension is applied on primary.
Observation 1: when in closed delta, where an inverse power flow condition can exist that is
not due to co-generation, the usage of an external VT is mandatory and its primary has to be
connected between “S” of regulator of reference phase, understanding that reference phase is
that where “FC” of regulator is connected keeping same phase sequence for direct flow
Observation 2: This is optional and has to be requested one purchase order
48 - Enabling Delayed return to automatic mode
In this parameter the CTR-2 has to be teached if to react or not when equipment is abandoned even when
energized. With this parameter set to “1” if CTR-2 keeps on service in manual mode operation for more than 15
minutes without accessing front keys or communications ports, operation mode will change to automatic. When this
parameter is set to “0” delayed return will keep disabled.
Note: “Auto Zero” (Auto zero) function, if used, disables automatic return to automatic mode.
Only when CTR-2 has a new energization will this parameter work again.
49 – Locl limit
This function defines percentage limit over nominal current for which inverse flow is inactive. If effective current over
regulators nominal current is less than set value, CTR-2 will not take into consideration modifications of flow sense.
50 - Datalogging period.
The CTR-2 control is capable to obtain and store more than 10000 records of the values hour, minute, day, month,
power factor, voltage, current, position of tap changer and operation mode (manual or automatic). Through this
parameter, we can adjust the frequency of records logs. The registration period will be equal to the value set in
minutes.
51 - Inverse time enabling
You can program the CTR- 2 to reduce time delays in each one of the maps in inverse proportion to the
differentiation between the measured voltage and the reference voltage ratio of each map.
ITB - Equipamentos Elétricos Ltda.
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