Date Code 20080213 Instruction Manual SEL-351A Relay
Section 3
Overcurrent, Voltage, Synchronism Check,
and Frequency Elements
Instantaneous/Definite-Time Overcurrent Elements
Phase Instantaneous/
Definite-Time
Overcurrent Elements
Four levels of phase instantaneous/definite-time overcurrent elements are
available. Two additional levels of phase instantaneous overcurrent elements
(Levels 5 and 6) are also available. The different levels are enabled with the
E50P enable setting, as shown in Figure 3.1, Figure 3.2, and Figure 3.3.
NOTE: The definite-time elements
are not supported in the SEL-351A-1.
The SEL-351A-1 supports six levels of
phase instantaneous elements.
Settings Ranges
Setting range for pickup settings 50P1P–50P6P:
0.25–100.00 A secondary (5 A nominal phase current inputs, IA, IB, IC)
0.05–20.00 A secondary (1 A nominal phase current inputs, IA, IB, IC)
Setting range for definite-time settings 67P1D–67P4D:
0.00–16000.00 cycles, in 0.25-cycle steps
Accuracy
Pickup:
±0.05 A secondary and ±3% of setting
(5 A nominal phase current inputs, IA, IB, IC)
±0.01 A secondary and ±3% of setting
(1 A nominal phase current inputs, IA, IB, IC)
Timer:
±0.25 cycles and ±0.1% of setting
Transient Overreach:
±5% of setting
Courtesy of NationalSwitchgear.com
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