Operational specifications, Metered current values and accuracy, Calculated values and accuracy – Basler Electric BE1-851 User Manual
Page 23: Demand, 50t instantaneous overcurrent protection, Pickup, Accuracy (50tp, 50tn), Accuracy (50tq), Time delay, Accuracy
Operational Specifications
BE1-851 relays have the following features and capabilities.
Metered Current Values and Accuracy
Current Range ................................................................ 0.1 to 1.5 nominal
Accuracy (Phase and Neutral) ........................................ ±1% of reading, ±1 least significant digit at 25°C
Accuracy (Negative-Sequence) ...................................... ±1.5% of reading, ±1 least significant digit at 25°C
Temperature Dependence .............................................. ≤ ±0.02% per °C
Calculated Values and Accuracy
Demand
Range ............................................................................. 0.1 to 1.5 nominal
Type ................................................................................ Exponential
Accuracy ......................................................................... ±1% of reading ±1 digit at 25°C
Interval ............................................................................ 1 to 60 minutes
50T Instantaneous Overcurrent Protection
Pickup
5 Ampere CT Setting Range .......................................... 0.5 to 150 A
1 Ampere CT Setting Range .......................................... 0.1 to 30 A
Dropout/Pickup Ratio ...................................................... 95%
Accuracy (50TP, 50TN)
5 Ampere CT .................................................................. ±2% or ±50 mA, whichever is greater
1 Ampere CT .................................................................. ±2% or ±10 mA, whichever is greater
Accuracy (50TQ)
5 Ampere CT .................................................................. ±3% or ±75 mA, whichever is greater
1 Ampere CT .................................................................. ±3% or ±15 mA, whichever is greater
Time Delay
Setting Range ................................................................. 0 to 60 s
Accuracy
50TP, 50TN .................................................................... ±0.5% or ±¼ cycle, whichever is greater, Plus trip
time for instantaneous response (0.0 setting)∗
50TQ ............................................................................... ±0.5% or ±1 cycle, whichever is greater, Plus trip
time for instantaneous response (0.0 setting)∗
∗
Trip Time for 0.0 Delay Setting
50TP, 50TN .............................................................. 1¼ cycles maximum for currents ≥ 5 times the
pickup setting. Three cycles maximum for a
current of 1.5 times pickup. Four maximum for a
current of 1.05 times the pickup setting.
50TQ ........................................................................ 2¼ cycles maximum for currents 5 times the
pickup setting. Three maximum for a current of
1.5 times pickup. Five cycles maximum for a
current of 1.05 times the pickup setting.
9289900990 Rev R
BE1-851 General Information
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