FANOX SIL-V, User Manual, Page: 29 / 212

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In case of “phase –Vr” , “phase-phase + Vr” or “2VT + Vr” configurations the
neutral is measured (although the relay also calculates the voltage, it is taken into account
the measured neutral voltage (residual voltage)).
In case of “Phase-neutral” or “phase-nVbb” configurations the neutral voltage is not
measured and it is used the calculated neutral voltage (vectorial sum of phases voltages)
to work with this protection function.
4.5. Function 47. Definite-time negative sequence overvoltage
This protection function is adjusted using four parameters:
Function Description Minimum Maximum Step Unit Default
47
Definite-time negative sequence overvoltage
Permission - - Yes/No - No
Pickup 6,0 999,0 0,1 V 10,0
Operating time 0,02 300,0 0,01 s 1,00
Reset time 0,02 300,0 0,01 s 0,20
The operating time is completely independent from the measured negative sequence
voltage, such that if the negative sequence voltage exceeds the adjusted value for a
period of time equal to or higher than the pre-established value, the protection function
actuates (trips) and does not reset itself until the measured negative sequence voltage
value drops below the pre-established voltage point during adjusting reset time.
The function activates at 100% of the adjusted input and deactivates at 95%. Reset is
temporized and reset time is adjusted with reset time parameter.
The accuracy of the operating time is the adjusted time ±30ms or ± 0.5% (greater of both).
4.6. Function
ΔV/Δt. Rate of change of voltage
Rate of change of voltage protects the circuit against voltage variations. This protection
function can be set by using the following parameters:
Group Description Minimum Maximum Step Unit Default
ΔV/Δt
Rate of change of voltage
Permission
- - Yes/No - No
Type
- - Decrement/Increment - Decrement
Activation level
1 200 1 V/s 1
Operating time
1.00 40,00 0,01 s 1,0
Reset time
0,02 300.00 0,01 s 1,00
The accuracy of the operating time is the adjusted time ±60ms or ± 5% (greater of both).