4.9
Date Code 20080213 Instruction Manual SEL-351A Relay
Loss-of-Potential, Load Encroachment, and Directional Element Logic
Directional Control for Neutral-Ground and Residual-Ground Overcurrent Elements (Not in SEL-351A-1)
Directional Control for Neutral-Ground and
Residual-Ground Overcurrent Elements (Not in
SEL-351A-1)
The directional control for overcurrent elements is enabled by making
directional control enable setting E32. Setting E32 and other directional
control settings are described in Directional Control Settings (Not in
SEL-351A-1) on page 4.38.
Six directional elements are available to control the neutral-ground and
residual-ground overcurrent elements (not all available simultaneously).
These six directional elements are:
➤ Negative-sequence voltage-polarized directional element
➤ Zero-sequence voltage-polarized directional element
➤ Channel IN current-polarized directional element
➤ Zero-sequence voltage-polarized directional element (low-
impedance grounded system)
➤ Wattmetric and incremental conductance directional elements
(Petersen Coil grounded system)
➤ Zero-sequence voltage-polarized directional element
(ungrounded/high-impedance grounded system)
Courtesy of NationalSwitchgear.com
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