Date Code 990215 Breaker/Recloser Monitor, Battery System Monitor, 8-31
Metering, and Load Profile Functions
SEL-351P Manual Técnico
Maximum/Minimum Metering Updating and Storage
The SEL-351P updates maximum/minimum values, if the following conditions are met:
• Access Level 2 SEL
OGIC
Control Equation setting FAULT is deasserted (= logical 0).
[The factory default setting is set with time-overcurrent element pickups:
FAULT = 51P1 + 51P2 + 51G1 + 51G2 + 51N1 + 51N2 + 67N3
If a fault picks up any of the elements in the above FAULT setting, the control
blocks updating of maximum/minimum metering values.
SEL
OGIC
Control Equation setting FAULT also has control over front-panel target
LEDs A, B, and C (see Front-Panel Target LEDs in Section 5: Trip and Target
Logic).]
• The metering value is above the previous maximum or below the previous minimum
for 2 cycles.
• For voltage values, the voltage is above 13 V secondary.
• For current values, the currents are above:
0.05 A secondary (1 A nominal)
• Megawatt and megavar values are subject to the above voltage and current thresholds.
The SEL-351P stores maximum/minimum values to nonvolatile memory once per day (it
overwrites the previous stored value if it is exceeded). Should the control completely lose
control power or go into the “sleep” mode, when power is restored, the control will restore the
maximum/minimum values saved at 23:50 hours on the previous day.
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