4 Protection Functions and Specifications
D02706R02.30
L-PRO 4000 User Manual
4-35
Four frequency elements are provided with adjustable definite time delays.
Frequency is determined from the main voltage input (3 phase voltage).
50LS
Overcurrent
The relay takes in currents from main, auxiliary CTs and 2 additional CT in-
puts, 50LS Input 3 and 50LS Input 4. These individual overcurrent devices can
be used with ProLogic to create logic. 50LS Input 3 and 50LS Input 4 are not
available in the Output Matrix.
Figure 4.21: Low Set Overcurrent
81.1
Pickup
50.000 to 59.995 or 60.005 to 70.000 (fixed level)
-10.0 to -0.1 or 0.1 to 10.0 (rate of change)
Pickup Delay
0.05 to 99.99 seconds (fixed level)
0.20 to 99.99 seconds (rate of change)
81.2
Pickup
50.000 to 59.995 or 60.005 to 70.000 (fixed level)
-10.0 to -0.1 or 0.1 to 10.0 (rate of change)
Pickup Delay
0.05 to 99.99 seconds (fixed level)
0.20 to 99.99 seconds (rate of change)
81.3
Pickup
50.000 to 59.995 or 60.005 to 70.000 (fixed level)
-10.0 to -0.1 or 0.1 to 10.0 (rate of change)
Pickup Delay
0.05 to 99.99 seconds (fixed level)
0.20 to 99.99 seconds (rate of change)
81.4
Pickup
50.000 to 59.995 or 60.005 to 70.000 (fixed level)
-10.0 to -0.1 or 0.1 to 10.0 (rate of change)
Pickup Delay
0.05 to 99.99 seconds (fixed level)
0.20 to 99.99 seconds (rate of change)
Table 4.18: 81 Over/Under Frequency Settings
Table 4.19: 50LS Low Set Overcurrent Settings
Main (Input 1)
Enable/Disable
Pickup
0.10 to 50.0 A secondary (5A)
0.02 to 10.0 A secondary (1A)
Pickup Delay
0.00 to 10.00 Seconds
Auxiliary (Input 2)
Enable/Disable
Pickup
0.10 to 50.0 A secondary (5A)
0.02 to 10.0 A secondary (1A)
Pickup Delay
0.00 to 10.00 Seconds
50 I1a RMS
50 I1b RMS
50 I1c RMS
0
T
Low Set Overcurrent
Summary of Contents for L-PRO 4000
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