These signals shall be used for communication based earth-fault teleprotection
communication schemes (permissive or blocking).
Simplified logic diagram for directional supervision element with integrated
directional comparison step is shown in figure
X
a
a>b
b
I>Dir
polMethod=Voltage
polMethod=Dual
OR
FORWARD_Int
REVERSE_Int
BLOCK
STAGE1_DIR_Int
0.6
X
0.4
AND
STAGE3_DIR_Int
STAGE4_DIR_Int
STAGE2_DIR_Int
OR
STRV
UPolMin
IPolMin
AngleRCA
T
F
0.0
X
T
F
RNPol
XNPol
0.0
D
ir
e
ct
io
n
al
C
h
ar
a
ct
e
ri
st
ic
FWD
RVS
AND
AND
AND
STFW
FORWARD_Int
REVERSE_Int
AND
IEC07000067-5-en.vsd
|
|
UPol
UIPol
IPol
I3PDIR
UTotPol
IopDir
Complex
Number
a
a>b
b
T
F
0.0
polMethod=Current
OR
IEC07000067 V5 EN
Figure 74:
Simplified logic diagram for directional supervision element with integrated directional comparison
step
8.4.8
Second harmonic blocking element
A harmonic restrain of the Four step residual overcurrent protection function
EF4PTOC can be chosen. If the ratio of the 2nd harmonic component in relation to the
fundamental frequency component in the residual current exceeds the pre-set level
defined by parameter setting
2ndHarmStab
. Any of the four residual overcurrent
stages can be selectively blocked by parameter setting
HarmRestrainx
. When 2nd
harmonic restraint feature is active the EF4PTOC function output signal
2NDHARMD will be set to logical value one.
Section 8
1MRK 504 135-UEN A
Current protection
170
Technical manual
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