
9170900990 Rev H BE1-67 General Information i
SECTION 1 •GENERAL INFORMATION
TABLE OF CONTENTS
SECTION 1 •GENERAL INFORMATION ................................................................................................1-1
DESCRIPTION.......................................................................................................................................1-1
LIMITED REGION OF OPERATION .....................................................................................................1-2
Load Current Approaches Fault Current............................................................................................1-3
Weak Infeed Condition.......................................................................................................................1-3
APPLICATION .......................................................................................................................................1-4
SAMPLE APPLICATION CALCULATIONS...........................................................................................1-5
Pickup.................................................................................................................................................1-6
Analysis of Fault L..............................................................................................................................1-7
Analysis of Fault M.............................................................................................................................1-7
Conclusions........................................................................................................................................1-8
MODEL AND STYLE NUMBER.............................................................................................................1-9
Style Number Identification Chart ......................................................................................................1-9
Style Number Example.......................................................................................................................1-9
SPECIFICATIONS...............................................................................................................................1-10
Current Sensing Input(s)..................................................................................................................1-10
Current Sensing Burden...................................................................................................................1-10
Time Overcurrent Pickup..................................................................................................................1-11
Pickup Accuracy...............................................................................................................................1-11
Dropout Ratio ...................................................................................................................................1-11
Time Delay Accuracy .......................................................................................................................1-11
Instantaneous Overcurrent...............................................................................................................1-11
Voltage Sensing Inputs ....................................................................................................................1-12
Voltage Sensing Burden...................................................................................................................1-12
Directional Unit.................................................................................................................................1-12
Sensitivity .........................................................................................................................................1-13
Characteristic Angle.........................................................................................................................1-13
Limited Range of Operation (Optional) ............................................................................................1-13
Frequency Range.............................................................................................................................1-13
Power Supply ...................................................................................................................................1-13
Target Indicators ..............................................................................................................................1-13
Output Circuits..................................................................................................................................1-14
Isolation............................................................................................................................................1-14
UL Recognized.................................................................................................................................1-14
GOST-R............................................................................................................................................1-14
Surge Withstand Capability..............................................................................................................1-14
Operating Temperature....................................................................................................................1-14
Storage Temperature.......................................................................................................................1-14
Shock................................................................................................................................................1-14
Vibration ...........................................................................................................................................1-14
Figures
Figure 1-1. Single-Phase Directional Overcurrent.....................................................................................1-1
Figure 1-2. Trip Direction Defined .............................................................................................................1-2
Figure 1-3. Weak Infeed Phenomenon .....................................................................................................1-3
Figure 1-4. Limiting the Region of Operation ............................................................................................1-4
Figure 1-5. Substations Fed from One Source..........................................................................................1-5
Figure 1-6. Substations Fed from Two Sources........................................................................................1-5
Figure 1-7. Significant Faults for Breaker A ..............................................................................................1-6
Figure 1-8. Coordination of Time Characteristic Curves...........................................................................1-8
Figure 1-9. Style Number Identification Chart...........................................................................................1-9
Figure 1-10. Typical Instantaneous Response Time...............................................................................1-12
Figure 1-11. Characteristic Angle............................................................................................................1-12
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