Second Harmonic Blocking Element - ABB RES670 Technical Manual

1MRK 511 408-UUS A
0.6
X
IDirPU
X
0.4
polMethod=Voltage
polMethod=Dual
polMethod=Current
BLOCK
ANSI07000067 V4 EN-US
Figure 61: Simplified logic diagram for directional supervision element with integrated directional comparison
step
8.2.7.9
Phasor measurement unit RES670 2.2 ANSI
Technical manual
These signals shall be used for communication based ground-fault teleprotection
communication schemes (permissive or blocking).
Simplified logic diagram for directional supervision element with integrated directional
comparison step is shown in Figure 61:
| |
IopDir
a
a>b
b
a
a>b
b
OR
OR
IPol
T
0.0
F
RNPol
X
Complex
Number
XNPol

Second harmonic blocking element

A harmonic restrain can be chosen for each step by a parameter setting HarmBlockx. 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
AND
REVERSE_Int
AND
FORWARD_Int
AngleRCA
VPolMin
IPolMin
VPol
T
I3PDIR
0.0
F
VTPol
VIPol
STAGE1_DIR_Int
T
STAGE2_DIR_Int
0.0
F
STAGE3_DIR_Int
STAGE4_DIR_Int
Section 8
Current protection
PUREV
PUFW
FWD
AND FORWARD_Int
AND
REVERSE_Int
RVS
OR
AND
ANSI07000067-4-en.vsd
M13941-200 v8
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