3.7
Date Code 20080103 Instruction Manual SEL-351S Relay
Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
Instantaneous/Definite-Time Overcurrent Elements
If instantaneous overcurrent elements are made directional, the pickup time
curve in Figure 3.5 is adjusted as follows:
multiples of pickup setting ≤4: add 0.25 cycle
multiples of pickup setting >4: add 0.50 cycle
Figure 3.5 SEL-351S Nondirectional Instantaneous Overcurrent Element
Pickup Time Curve
Figure 3.6 SEL-351S Nondirectional Instantaneous Overcurrent Element
Reset Time Curve
Phase-to-Phase
Instantaneous
Overcurrent Elements
Four levels of phase-to-phase instantaneous overcurrent elements are
available. The different levels are enabled with the E50P enable setting, as
shown in Figure 3.7.
Setting Range
Setting range for pickup settings 50PP1P–50PP4P:
1.00–170.00 A secondary (5 A nominal phase current inputs, IA, IB, IC)
0.20–34.00 A secondary (1 A nominal phase current inputs, IA, IB, IC)
Accuracy
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.2 2 3 4 5 6 7 8 9 10
Applied Current (Multiples of Pickup Setting)
Pickup Time (Cycles)
Maximum
Minimum
0
0.5
1
1.5
2
1.2 2 3 4 5 6 7 8 9 10
Applied Current (Multiples of Pickup Setting)
Reset Time (Cycles)
M aximum
M inimum
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)
To Next Page
Loading...
