Date Code 20001006 Manual Change Information vii
SEL-351 Instruction Manual
Revision
Date
Summary of Revisions
980508 This revision includes the following changes:
− Added Power Elements to Section 3: Overcurrent, Voltage, Synchronism
Check, Frequency, and Power Elements.
− Added Load Profiling to Section 8: Breaker Monitor, Metering, and Load
Profile Functions.
− Updated Relay Word and explanations in Section 9: Setting the Relay.
− Added COM and LOO commands to Section 10: Serial Port
Communications and Commands.
− Updated Event report and explanations in Section 12: Standard Event
Reports and SER.
− Clarified DNP implementation details in Appendix H: Distributed Network
Protocol (DNP) V3.00.
− Added Appendix I: Mirrored Bits.
− Synchronism-check voltage input logic in Figure 3.26 was clarified. Voltage
input V
A
(or V
AB
for delta), provides frequency determination and has to be
within the “healthy voltage” window (indicated by new Relay Word bit 59VA).
− Positive-sequence voltage-polarized directional element logic in Figure 4.15 is
clarified with respect to the three-phase current threshold element 50P32 (was
previously shown in the wrong place).
− The OPEN command is no longer embedded in the trip logic in Figure 5.1 (see
the Note following 4.2) or in the drive-to-lockout logic (see the Note in the
Lockout State discussion, following Table 6.1).
− Execution of the OPEN command no longer prevents the COMM target LED
from illuminating for a trip. This provides additional options for the COMM
target LED, discussed in the Front-Panel Target LEDs subsection at the end
of Section 5: Trip and Target Logic.
− Relay Word bit TRGTR (Target Reset) is now available and provides
additional options, detailed in Figure 5.17 and accompanying discussion.
− The CLOSE command is no longer embedded in the close logic in Figure 6.1
(see the Note in the SET Close discussion, following Figure 6.1, for more
information).
− Relay Word bit 52A (Circuit Breaker Status) is now available and provides
additional options, detailed near the end of the Close Logic subsection in
Section 6: Close and Reclose Logic.
− Additional Relay Word bits 59VA, TRGTR, and 52A added to Row 34 in
Tables 9.4 and 9.8.
− Revisions were made to accommodate hardware changes related to model SEL-
03510J/03511J, which are connectorized™. New drawings were added to
Section 2: Installation, and various model-specific text references were
updated throughout the manual.
Courtesy of NationalSwitchgear.com
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