CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–99
Figure 6-43: Wattmetric ground fault logic diagram
Directional power (32)
The Directional Power element responds to three-phase directional power and is designed
for reverse power (32REV) and low forward power (32FWD) applications for synchronous
machines or interconnections involving co-generation. The relay measures the three-
phase power from either a full set of wye-connected VTs or a full-set of delta-connected
VTs. In the latter case, the two-wattmeter method is used. The function has two
independent elements; typically one element is used for alarming and the other stage for
tripping.
SE
TP
OI
N
T
=D
is
a
bl
ed
=A
la
rm
FU
N
C
TI
O
N
=
Lat
ch
ed
A
lar
m
=C
o
nt
ro
l
=T
rip
LE
D
:A
LA
R
M
OR
Vo
la
til
e,
Re
se
t-
do
m
in
a
n
t
La
tc
h
S
R
AN
D
AN
D
RE
S
ET
Co
m
m
an
d
AN
D
LE
D
:T
RI
P
O
pe
rat
e
O
ut
pu
t
Re
la
y
1
(T
RI
P)
Tr
ip
(t
o
B
re
a
ke
rF
ail
u
re
)
OR
SE
TP
OI
N
TS
=O
n
BL
O
C
K
1
:
=O
n
BL
O
C
K
2
:
=O
n
BL
O
C
K
3
:
OR
AN
D
SE
TP
OI
N
T
RU
N
PO
W
ER
P
IC
K
U
P
:
S
op
=
Re
{
V
n
·(
I
n
·
1E
CA
°)
*}
SE
TP
OI
N
TS
CU
R
RE
N
T:
Ca
lc
ul
a
te
d
In
o
r
Me
as
u
re
d
Ig
VO
LT
A
G
E
:
Ca
lc
ul
at
ed
V
n
o
r
Me
a
su
re
d
V
x
SE
TP
OI
N
TS
RU
N
PO
W
ER
P
IC
K
U
P
:
S
op
>P
K
P
RU
N
VO
LT
A
G
E
P
IC
K
U
P
:
V
MA
G
>P
K
P
RU
N
CU
R
RE
N
T
PI
C
K
U
P
:
I
MA
G
>P
K
P
AN
D
SE
TP
OI
N
T
PO
W
ER
P
IC
K
U
P
D
EL
A
Y:
0
T
PKP
SE
TP
OI
N
TS
RU
N
MU
LT
IP
LI
E
R:
CU
R
VE
:
RE
F
PO
W
ER
P
IC
K
U
P
:
SE
TP
OI
N
TS
OUTPUT REL
A
Y
X
Do Not Operate, Operate
LE
D
:P
IC
K
U
P
M
e
ssa
g
e
Ev
en
t
Rec
or
de
r
Tr
a
n
si
en
t
Re
co
rd
e
r
M
e
ssa
g
e
Ev
en
t
Rec
or
de
r
Tr
a
n
si
en
t
Re
co
rd
e
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