ABB RED650 - Page 183

The STDIRCND output provides an integer signal that depends on the start and
directional evaluation and is derived from a binary coded signal as described in
Table 74.
Table 74: Code description for STDIRCND output signal
STDIRCND
Description
bit 0 (1) General start
bit 1 (2) Direction detected in forward
bit 2 (4) Direction detected in reverse
bit 3 (8) Start in phase L1
bit 4 (16) Forward direction detected in phase L1
bit 5 (32) Reverse direction detected in phase L1
bit 6 (64) Start in phase L2
bit 7 (128) Forward direction detected in phase L2
bit 8 (256) Reverse direction detected in phase L2
bit 9 (512) Start in phase L3
bit 10 (1024) Forward direction detected in phase L3
bit 11 (2048) Reverse direction detected in phase L3
All four steps in OC4PTOC can be blocked from the binary input BLOCK. The
binary input BLKSTx (x=1, 2, 3 or 4) blocks the operation of the respective step.
The start signals from the function can be blocked by the binary input BLKST.The
trip signals from the function can be blocked by the binary input BLKTR.
GUID-E3980B2D-EEDA-4BF1-A07D-E7B721130554 v5
A harmonic restrain of the directional phase overcurrent protection function
OC4PTOC can be chosen. If the ratio of the 2nd harmonic component in relation to
the fundamental frequency component in a phase current exceeds the preset level
defined by the parameter 2ndHarmStab setting, any of the four overcurrent stages
can be selectively blocked by the parameter HarmBlockx setting. When the 2nd
harmonic restraint feature is active, the OC4PTOC function output signal
ST2NDHRM will be set to the logical value one.
1MRK 505 394-UEN A Section 8
Current protection
Line differential protection RED650 2.2 IEC 177
Technical manual