Second Harmonic Blocking Element - ABB RED650 Technical Manual

1MRK 505 394-UEN A
0.6
X
IN>Dir
X
0.4
polMethod=Voltage
polMethod=Dual
polMethod=Current
RNPol
XNPol
BLOCK
IEC07000067 V6 EN-US
Figure 87: Simplified logic diagram for directional supervision element with integrated directional
comparison step
8.4.7.9
Line differential protection RED650 2.2 IEC
Technical manual
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 87:
|
| IopDir
a
a>b
b
a
a>b
b
OR
UPol
OR
IPol
T
0.0
F
X
Complex
Number

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 2ndHarmStab), output signal 2NDHARMD is set to logical
value one and the harmonic restraining feature to the function block will be
applicable.
Blocking from the 2nd harmonic element activates if all of three criteria are
satisfied:
AND
REVERSE_Int
AND
FORWARD_Int
AngleRCA
UPolMin
IPolMin
T
I3PDIR
0.0
F
UTotPol
UIPol
STAGE1_DIR_Int
T
STAGE2_DIR_Int
0.0
F
STAGE3_DIR_Int
STAGE4_DIR_Int
Section 8
Current protection
STRV
STFW
FWD
AND FORWARD_Int
AND
REVERSE_Int
RVS
OR
AND
IEC07000067-6-en.vsdx
M13941-200 v8
199