Negative sequence overvoltage protection (59Vi)
This protection function can be enabled or disabled by the user (default is disabled).
The threshold value of negative sequence overvoltage protection can be set from 1% to 40% of rated
voltage, in steps of 1%. This threshold has a time delay, whose value can be set from 0.05 to 60 s, in
steps of 0.05 s.
By means of the programming software, signaling protection intervention of negative sequence
overvoltage threshold is user configurable on TS67AV and/or TS51A relay, whose contacts are
connected to the terminal block MB and acquired by remote control system (default TS51A).
Positive sequence undervoltage protection (27Vd)
This protection function can be enabled or disabled by the user (default is disabled).
The threshold value of positive sequence undervoltage protection can be set from 20% to 110% of
rated voltage, in steps of 1%. This threshold has a time delay, whose value can be set from 0.05 to 60
s, in steps of 0.05 s.
By means of the programming software, signaling protection intervention of positive sequence
undervoltage threshold is user configurable on TS67AV and/or TS51A relay, whose contacts are
connected to the terminal block MB and acquired by remote control system (default TS67AV).
Voltage sensors supervisor function (VSS)
This function can be enabled or disabled by the user (default is disabled).
This function uses the residual voltage measurement and has a threshold value that can be set from
1% to 40% of rated voltage, in steps of 1%. This threshold has a time delay, whose value can be set
from 0.05 to 600 s, in steps of 0.05 s.
Permanence of residual voltage above the programmed threshold for a time longer than the value set
for the delay time is used to detect a fault condition of the voltage transducers of combined sensors,
therefore the function 67N is disabled and relay TSPresV is placed in quiescent status (the three
green LEDs used by voltage presence function will emit a flashing warning). Protection functions 51
and 51N are not affected by this kind of anomaly.
Current converter
The device RGDAT-A70 provides to remote control system a 4÷20 mA current output, proportional to
the value of the current measured by current sensor connected to pin 2 of terminal block MA.
Using the configuration software, the user can program the full scale value of current output, from 100
A to 900 A, in steps of 10 A.
You can also set up the measurement output as unidirectional or bidirectional. The direction of the
measurement is determined by evaluating the angle between the positive sequence voltage and the
positive sequence current (direction "positive" for angle between ±90°).
In the case of unidirectional measurement, the entire current range (4÷20 mA) is used to set the full
scale.
In the case of bidirectional measurement, there is this division of the scale:
• 4÷12 mA for “negative” measurement
• 12÷20 mA for “positive” measurement
P515D851 Rev. E November 2019 Pag. 11 of 45
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