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steps. In this example, the line reactance is 0.8
ohms/mile; set XPUD = 0.8.
The fault distance calculation is as follows:
×
∠
Z
sin
FANG
VTR
S
×
DMI
=
------------ -
-------------------------------------------- -
CTR
XPUD
Where Z
is the secondary impedance magnitude,
S
and FANG is the fault angle.
5.2.9 The setting of DTYP (distance type) has a
selection of MILE and KM. It should be selected to
match with the setting of XPUD. For this example,
select DTYP = MILE.
5.2.10 The setting of TTYP is for selecting the re-
closing mode in single pole trip applications (if
applicable). It has six selecting positions (OFF, 1PR,
2PR, 3PR, SPR, and SR3R). Refer to the guidelines
for reclosing mode programming for the TTYP set-
ting selection.
5.2.11 For an SPT application, set the 62T single
phasing limit timer from 300 to 5000 ms in 50 ms
steps. The setting is based on the generator's (I
performance. LV should be set between 85% and
90% of the rated line-to-neutral voltage.
5.2.12 The settings of Z1RI, Z2RI and Z3RI pro-
vide the selectivity for Zone 1 RI (reclosing initiation),
Zone 2 RI and Zone 3 RI, respectively. For the non-
pilot system application, set Z1RI, Z2RI and/or Z3RI
to YES, if RI is required when the particular distance
zone operates. For the pilot reclosing, Z1RI should
be set to "YES".
5.2.13 For a pilot system, set BFRB to YES if RB
on the breaker failure squelch feature is required.
5.2.14 The setting of PLT (pilot) combines with the
signal of Pilot Enable (on the backplane panel) and
controls the operation of pilot and reclosing initiation.
The absence of either signal will:
• disable the pilot system
• block the RI2 output, and
• allow an RI1 output for a non-pilot system.
The PLT can be set either locally from the front panel
or, remotely, via the communication channel.
5.2.15 The STYP (system type) selects the desired
relaying system for the application. It has two selec-
tions: 3ZNP (3 zone non-pilot) and Z1E (Zone 1
extension) in the non-pilot MDAR. There are five se-
lections: 3ZNP, Z1E, POTT (permissive overreach
(5/92)
transfer trip or unblocking), PUTT (permissive
underreach transfer trip) and BLK (blocking) in the
pilot MDAR. It should be set to the desired selection.
5.2.16 For the pilot MDAR only, the WFEN (weak-
feed enable) selection should be set to YES for the
weakfeed terminal, if applicable.
5.2.17 For pilot MDAR only, the 3TRM (3 termi-
nals) setting should be selected to YES for all of the
three terminals that apply.
5.2.18 For application of POTT/BLK systems, the
transient block logic is always in the POTT/BLK sys-
tem, but it is initiated by the reverse looking units.
The Z3FR setting should be set to "YES" and Z3P,
Z3G should be set to 100% of the line impedance.
5.2.19 The FDGT (FDOG trip delay timer) can be
set from 0 to 15 cycles or block (BLK) as desired. It
is recommended to set to 3 cycles or longer. Refer
to Section 3.9 for the detailed FDGT information.
5.2.20 Distance/overcurrent units can be disabled
if required by the application. The following distance/
2
overcurrent units can be disabled by setting the unit
)
t
2
to OUT:
a. List of units which can be disabled:
PLTP, PLTG, Z1P, Z2P, Z2G, Z3P, Z3G, ITP, ITG
and GB.
b. Procedure to disable the unit:
Switch MDAR to the setting mode, scrolling the func-
tion field to the proper function Then set the unit to
OUT via the value field.
5.2.21 Set T1 to YES if Zone 1 delay trip is required.
5.2.22 The T2P, T2G, T3P and/or T3G timer func-
tions can be disabled, if desired, by setting the timer
to BLK.
5.2.23 The Zone 3 distance units (Z3P and Z3G)
can be selected to reach forward-looking or reverse-
looking by setting the Z3FR (Zone 3 forward or re-
verse) to FWD or REV.
5.2.24 Set the positive sequence impedance an-
gle (PANG) value based on the positive sequence
line impedance angle. This setting affects the perfor-
mance of the distance units.
5.2.25 Set the zero sequence impedance angle
(GANG) value based on the zero sequence line im-
pedance angle. This setting affects the performance
of the distance units.
I.L. 40-385.1B
5-5
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