Read Primary Setting (Read Out); Ohms Per Unit Distance (X / Dist); Distance Type (Distunit) Setting; Reclosing Mode (Ri Type) Setting - ABB REL 301 Instruction Leaflet

For this example, set "CT Type" = 5 since a 5 amp current transformer is used.
The setting of "CT Type" affects all the distance unit and overcurrent unit setting ranges. The
ranges will be automatically changed as listed in Table 3-1.
3.3.7 Read Primary Setting ("Read Out")
The "Read Out" should be set to "Primary Units" if all the monitoring ac voltages and currents
are selected to be displayed in primary KV and KA values, respectively. Select "Secondary
Units" to view voltages and currents in relay or secondary values.
3.3.8 Ohms Per Unit Distance ("X / Dist")
The line reactance setting "X / Dist" is the multiplier for fault distance calculation. It has a range
of 0.3 to 1.5 ohms (primary) in 0.001 steps. In this example, the line reactance is 0.8 ohms/mile;
set "X / Dist" = "0.8 Ohms".
The fault distance calculation is as follows:
Flt Dist
Where Z
3.3.9 Distance Type ("DistUnit") Setting
Distance type ("DistUnit") has a selection of "MILE" or "KM". It should be selected to match
with the setting of "X / Dist". For this example, select "DistUnit" = "MILE".
3.3.10 Reclosing Mode ("RI Type") Setting
"RI Type" is for selecting the reclosing mode. It has four setting positions, "No RI", "ØG RI",
"ØØ,ØG RI', "3Ø, ØØ, ØØG, ØG RI". Refer to the guidelines for reclosing mode programming
for the "RI Type" setting selection in Section 2.4.14.
3.3.11

Reclose Initiation Settings

"Fast RI", "Zone-2 RI" and "Zone-3 RI" provide the selectivity for High speed tripping units,
Zone-2 and Zone-3 reclosing initiation, respectively. See Section 2.4.14 for details
3.3.12 Remote Breaker Failure, Reclose Block ("RemBF RB")
For a pilot system (REL 302 only), set "RemBF RB" to "Yes" if reclose block output to prevent
the remote breaker from reclosing for local breaker.
3.3.13 Remote Pilot Control ("Pilot") Setting
"Pilot" set to "Yes" combines with the signal of P
the operation of pilot logic tripping and reclosing initiation. The absence of either signal will dis-
able the pilot system logic.
The "Pilot" setting can be set either locally from the front panel, or via the communication in-
terface.
2. Bold type, with small capital letters, indicates an input e.g. R
× ∠
Z sin FANG
VT Ratio
S
×
= ------------------------- - ------------------------------------------- -
CT Ratio X / Dist
is the secondary impedance magnitude, and FANG is the fault angle.
S
E
LT NA
push-button or voltage inputs.
ESET
I.L. 40-386.4
2
(external 85CO input) and controls
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