Directional Supervision Element With Integrated Directional Comparison Function - ABB REL650 series Technical Manual

Section 7
Current protection
7.6.7.7
226
available. For the complete list of available inverse curves please refer to section
"Inverse time characteristics".
• Time delay related settings. By these parameter settings the properties like definite
time delay, minimum operating time for inverse curves and reset time delay are
defined.
• Supervision by second harmonic blocking feature (Enabled/Disabled). By this
parameter setting it is possible to prevent operation of the step if the second harmonic
content in the residual current exceeds the preset level.
Simplified logic diagram for one residual overcurrent step is shown in figure 99.
|I |
OP
Pickupx
BLKx
BLOCK
2ndH_BLOCK_Int
HarmRestrainx=Disabled
DirModeSelx=Disabled
DirModeSelx=Non-directional
DirModeSelx=Forward
DirModeSelx=Reverse
ANSI09000638 V3 EN
Figure 99: Simplified logic diagram for residual overcurrent
The protection can be completely blocked from the binary input BLOCK. Output signals
for respective step, PU_STx and TRSTx and , can be blocked from the binary input
BLKn.
Directional supervision element with integrated directional comparison
function
It shall be noted that at least one of the four residual overcurrent steps shall
be set as directional in order to enable execution of the directional
supervision element and the integrated directional comparison function.
The protection has integrated directional feature. The operating quantity current I3PDIR
is always used. The polarizinwcg method is determined by the parameter setting
Characteristn=DefTime
a
a>b
b
AND
Characteristn=Inverse
OR
OR STEPx_DIR_Int
AND
OR
FORWARD_Int
AND
REVERSE_Int
1MRK 506 335-UUS A
AND 0-tx
OR
0
0-txMin
0
AND
Inverse
ANSI09000638-3-en.vsd
Technical manual
TRST
x
PU_ST
x