X
a
a>b
b
IDirPU
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
PUREV
VPolMin
IPolMin
AngleRCA
T
F
0.0
X
T
F
RNPol
XNPol
0.0
D
ire
ct
io
n
al
C
ha
ra
ct
e
ris
tic
FWD
RVS
AND
AND
AND
PUFW
FORWARD_Int
REVERSE_Int
AND
ANSI07000067-4-en.vsd
|
|
VPol
VIPol
I3PDIR
VTPol
IopDir
Complex
Number
a
a>b
b
IPol
T
F
0.0
polMethod=Current
OR
ANSI07000067 V4 EN
Figure 58:
Simplified logic diagram for directional supervision element with integrated directional comparison step
8.2.7.9
Second harmonic blocking element
A harmonic restrain of four step residual overcurrent protection function EF4PTOC can
be chosen for each step by a parameter setting
HarmRestrainx
. If the ratio of the 2nd
harmonic component in relation to the fundamental frequency component in the residual
current exceeds the preset level (defined by parameter
2ndHarmStab
) then ST2NDHRM
function output signal is set to logical value one and harmonic restraining feature to the
function block will be applicable.
Blocking from 2nd harmonic element activates if all three criteria are satisfied:
1MRK 511 365-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.1 ANSI
207
Technical manual
Содержание Relion 670 Series RES670
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