I.4
SEL-351A Relay Instruction Manual Date Code 20080213
Using the SEL-251 and SEL-267 Relay Settings in the SEL-351A Relay
Main Differences Between Settings for the SEL-251, SEL-267, and SEL-351A Relays
There are three groups of type 67 protection elements:
➤ Q = Negative-sequence voltage polarized
➤ V = Zero-sequence voltage polarized
➤ I = IN current polarized (not available if channel IN is ordered
with 0.2 A or 0.05 A nominal current rating)
These directional elements are enabled via the ORDER settings. E32 = Y or
E32 = AUTO must be set before directional elements can be used.
Torque Control
Duplicate any scheme using each element’s torque control SELOGIC control
equation setting in the SEL-351A.
Reclosing Relay
Program the four-shot recloser in the SEL-351A to simulate the four-shot
recloser in the SEL-251-3 or the three-shot recloser in the SEL-267-5.
Programmable Inputs and Outputs
SELOGIC control equations give the SEL-351A extremely flexible input and
output capabilities. Use them to program the schemes of the SEL-251-3 and
SEL-267-5 relays.
Extra Features
If you want to configure and use the new features of the SEL-351A, such as
the Sequential Events Recorder (SER), Breaker Wear Monitor, Synchronism
Check Elements, and Over-/Underfrequency Elements, check the related
sections of this SEL-351A Instruction Manual. Other sections of this manual
give details on applying all of the settings and features of the SEL-351A.
Courtesy of NationalSwitchgear.com
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