I.L. 40-386.3
2-10
(10/94)
3 )
∆
I
0 :
i f [ ( 3 I
0
)
K n
- ( 3 I
0
)
( K - 1 ) n
] > 0 . 5 a m p .
W h e r e n = 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 a n d
K = n u m b e r o f c y c l e s
2.4.11 Ground Directional Polarization Selection
The ground directional unit
Dir Type (DIRU)
contains three selections
Zero Sequence
(ZSEQ), Negative Sequ (NSEQ)
and
Dual Polariz (DUAL)
, which determine the operation
of the forward directional overcurrent ground
(FDOG)
and reversed directional
(RDOG)
. If the
Zero Sequence (ZSEQ)
is selected, both FDOG and RDOG units will be
operated by a zero-sequence voltage polarizing element. Forward direction is identified
by the angle, if 3I
0
leads 3V
0,
between 30
°
and 210
°
. The sensitivity of this element is
3I
0
> 0.5A and 3V
0
>1.0 Vac. If
Negative Sequ (NSEQ)
is selected, both FDOG and
RDOG will be operated by Negative Sequence quantities. The maximum sensitivity for
the forward directional unit is when I
2
leads V
2
by 98
°
, with V
2
1.0 Vac and 3I
2
≥
0.5A.
If
Dual Polariz (DUAL)
is selected, the FDOG and RDOG will be determined by either
zero sequence voltage polarizing element, as the setting of
Zero Sequence (ZSEQ)
or
current polarizing directional element (I
P
), which is connected to FT switches #12 and
13 and is from power transformer neutral (ct). The maximum torque angle between 3I
0
and I
P
equals zero degrees, i.e., the forward direction is identified when 3I
0
leads I
P
by
0
°
to 90
°
or lags by 0
°
to 90
°
. The sensitivity of this element is >3I0.5 and Ip>0.1 Amps.
2.4.12 Instantaneous Forward Directional Overcurrent
(FDOG)
The instantaneous forward directional overcurrent ground function
(FDOG)
is a direc-
tional unit depending on the setting of
Dir Type (DIRU)
as described in the preceding
section 2.4.11
. FDOG is supervised by the
Iom
setting and controls Zone1, Zone2 and
Zone3 ground units for security purposes.
2.4.13 Instantaneous Reverse Directional Overcurrent Ground (RDOG)
Similar to
FDOG
, the instantaneous reverse directional overcurrent ground function
(RDOG)
supervises the ground units to prevent false trip.
2.4.14 Programmable Reclose Initiation and Reclose Block Logic
The REL 301/302 system provides the following contact output for Reclosing Initiation
and reclosing block functions
(Figure 2-19)
:
• RI2, used for Reclosing Initiation on 3-pole trip
• RB, used for Reclosing Block
The operation of RI2 and RB contacts is controlled by the setting of the programmable
Reclosing Initiation logic
(as shown in Figure 2-19)
. The operation of either RI2, or RB
must be confirmed by the signal of TRSL, which is the trip output of REL 301/302 op-
eration.
The most common Reclosing Initiation practice is to have Reclosing Initiation on high
speed (Pilot, Zone1 and high set overcurrent) trip only. On Pilot version programming
can be accomplished by closing the pilot enable switch and setting the
Pilot (PLT)
to
YES
(Figure 2-19)
. AND-84 will produce logic to operate the RI2 relay when receiving
signals from TRSL and AND-89.
Summary of Contents for REL 301
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Page 17: ...I L 40 386 3 1 10 10 94 2682F39 Sheet 1 of 2 Sub 2 Figure 1 2 REL 301 302 Layout Vertical...
Page 18: ...I L 40 386 3 10 94 1 11 2682F39 Sheet 2 of 2 Sub 2 Figure 1 3 REL 301 302 Layout Horizontal...
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Page 62: ...I L 40 386 3 10 94 2 41 Figure 2 32 CO 2 Curve Characteristics 619596 Sub 2...
Page 63: ...I L 40 386 3 2 42 10 94 Figure 2 33 CO 5 Curve Characteristic 619597 Sub 2...
Page 64: ...I L 40 386 3 10 94 2 43 Figure 2 34 CO 6 Curve Characteristic 619598 Sub 2...
Page 65: ...I L 40 386 3 2 44 10 94 Figure 2 35 CO 7 Curve Characteristic 619599 Sub 2...
Page 66: ...I L 40 386 3 10 94 2 45 Figure 2 36 CO 8 Curve Characteristic 619600 Sub 2...
Page 67: ...I L 40 386 3 2 46 10 94 Figure 2 37 CO 9 Curve Characteristic 619601 Sub 2...
Page 68: ...I L 40 386 3 10 94 2 47 Figure 2 38 CO 11 Curve Characteristic 619602 Sub 2...
