9328900990 Rev L BE1-951 General Information 1-9
Contact Inputs Recognition Time
Programmable, 4 to 255 milliseconds
Time Overcurrent Functions
Current Pickup, Phase & Neutral (51P, 51N, 151N)
Dropout/pickup ratio: 95%
Pickup Accuracy
5 Ampere CT: ±2% or ±50 mA
1 Ampere CT: ±2% or ±10 mA
Current Pickup, Negative-Sequence (51Q)
Dropout/pickup ratio: 95%
Pickup Accuracy
5 Ampere CT: ±3% or ±75 mA
1 Ampere CT: ±3% or ±15 mA
Current Input All 51 Functions
5 Ampere CT
Range: 0.50 to 16.0 A
Increments: 0.01 from 0.50 to 9.99, 0.1 from 10.0 to 16.0
1 Ampere CT
Range: 0.10 to 3.2 A
Increments: 0.01 A
Time Current Characteristic Curves
Timing Accuracy (All 51 Functions): Within ±5% or ±1½ cycles whichever is greater for
time dial settings greater than 0.1 and multiples of
2 to 40 times the pickup setting but not over 150 A
for 5 A CT units or 30 A for 1 A CT units.
See Appendix A, Time Current Characteristics, for
information on available timing curves.
Instantaneous Overcurrent Functions
Current Pickup Accuracy, Phase, and Neutral
(50TP, 50TN, 150TP, 150TN): Dropout/pickup ratio: 95% or higher
5 Ampere CT: ±2% or ±50 mA
1 Ampere CT: ±2% or ±10 mA
Current Pickup Accuracy, Negative-Sequence
(50TQ, 150TQ): Dropout/pickup ratio: 95% or higher
5 Ampere CT: ±3% or ±75 mA
1 Ampere CT: ±3% or ±15 mA
NOTE
All timing specifications are for the worst-case response. This includes output
contact operate times and standard BESTlogic operation timing, but excludes
input debounce timing and non-standard logic configurations. If a non-standard
logic scheme involves feedback, then one or more BESTlogic update rate delays
must be included to calculate the worst-case delay. An example of feedback is
Virtual Outputs driving Function Block Inputs. For more information, see Section
7, BESTlogic Programmable Logic.
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