4.38
SEL-351-5, -6, -7 Relay
Instruction Manual
Date Code 20070117
Loss-of-Potential, Load Encroachment, and Directional Element Logic
Directional Control Settings
Directional Control Settings
The directional control for overcurrent elements is enabled by making
directional control enable setting E32. Setting E32 has setting choices:
➤
Y enable directional control
➤
N disable directional control
➤
AUTO enable directional control and set many of the
directional element settings automatically
If directional control enable setting E32 = N, directional control is disabled
and no directional control settings are made. All level direction settings are set
internally as:
DIR1 =
N
(no directional control for Level 1 overcurrent elements)
DIR2 =
N
(no directional control for Level 2 overcurrent elements)
DIR3 =
N
(no directional control for Level 3 overcurrent elements)
DIR4 =
N
(no directional control for Level 4 overcurrent elements)
With the above settings, the directional control outputs in
assert to logical 1. The overcurrent
elements referenced in
,
, and
are then not controlled by the directional control logic.
There is one case that does not allow group setting E32 = Y or AUTO. If all
three of the following are true, E32 can only be set to “N.”
➤
The relay model has a 0.2 A or 0.05 A nominal neutral channel.
➤
Global setting VSCONN = VS.
➤
Group setting VNOM = OFF.
Settings Made
Automatically
If the directional control enable setting E32 is set:
E32 =
AUTO
then the following directional control settings are calculated and set
automatically:
Z2F, Z2R, 50QFP, 50QRP, a2, k2, 50GFP, 50GRP, a0, Z0F, Z0R, and
Z0MTA
If
E32 =
AUTO
then Z0MTA is set equal to Z0ANG and Z0MTA is hidden.
Once these settings are calculated automatically, they can only be modified if
the user goes back and changes the directional control enable setting to E32 =
Y.
The remaining directional control settings are
not
set automatically if setting
E32 = AUTO. They have to be set by the user, whether setting E32 = AUTO or
Y. These settings are:
DIR1, DIR2, DIR3, DIR4, ORDER, 50P32P, 50NFP, 50NRP, a0N,
59RES, 32WFP, 32WRP, 32WD, and E32IV (E32IV is a SEL
OGIC
setting)
All these settings are explained in detail in the remainder of this subsection.
Summary of Contents for SEL-351-5
Page 10: ...This page intentionally left blank ...
Page 22: ...This page intentionally left blank ...
Page 40: ...This page intentionally left blank ...
Page 80: ...This page intentionally left blank ...
Page 202: ...This page intentionally left blank ...
Page 238: ...This page intentionally left blank ...
Page 320: ...This page intentionally left blank ...
Page 402: ...This page intentionally left blank ...
Page 436: ...This page intentionally left blank ...
Page 478: ...This page intentionally left blank ...
Page 500: ...This page intentionally left blank ...
Page 594: ...This page intentionally left blank ...
Page 598: ...This page intentionally left blank ...
Page 622: ...This page intentionally left blank ...
Page 644: ...This page intentionally left blank ...
Page 674: ...This page intentionally left blank ...