Woodward High PROTEC MRU4, Manual

Page: 484 / 655

Protective Elements
Parameter Description Setting range Default Menu path
Measuring method Measuring method: fundamental or rms or 3rd
harmonic (only generator protection relays)
Fundamental,
True RMS
Fundamental [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/General settings]
Alarm Mode Alarm criterion for the voltage protection stage. any one,
any two,
all
any one [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/General settings]
Meas Circuit
Superv Activates the use of the measuring circuit supervision.
In this case the module will be blocked if a measuring
circuit supervision module (e.g. LOP, VTS) signals a
disturbed measuring circuit (e.g. caused by a fuse
failure). inactive,
active
inactive [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/General settings]
AR controlled LVRT Activates the supervision of the number of voltage dips
during a defined time (t-LVRT).
inactive,
active
inactive [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/General settings]
Number of V dips to
trip Number of voltage dips until the disconnection signal
(trip) will be issued.
Only available if:AR controlled LVRT = active
1 - 6 1 [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/General settings]
t-LVRT This timer defines the supervision interval
(window/period) for counting the number of voltage dips
to trip (“No of V dips to trip”). The first voltage dip will
start the timer. The counted number of voltage dips will
be reset if the timer is expired. The timer will also be
reset if the maximum “No of V dips to trip” is reached.
Only available if:AR controlled LVRT = active
0.00 - 3000.00s 30.00s [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/General settings]
Vstart< A voltage dip is detected if the measured voltage falls
below this threshold. 0.00 - 1.50Vn 0.90Vn [Protection Para
/<1..4>
/Intercon-Prot
/LVRT[1]
/LVRT Profile]
484 MRU4 DOK-HB-MRU4-2E