Schweitzer Engineering Laboratories SEL-387E - SECTION 10: TESTING AND TROUBLESHOOTING

Date Code 20080110 Testing and Troubleshooting i
SEL-387E Instruction Manual
TABLE OF CONTENTS
SECTION 10: TESTING AND TROUBLESHOOTING ......................... 10-1
Introduction.................................................................................................................................10-1
Testing Methods and Tools ........................................................................................................10-1
Test Features Provided by the Relay ..................................................................................10-1
Low-Level Test Interface....................................................................................................10-2
Test Methods.......................................................................................................................10-2
Target LED Illumination.............................................................................................10-3
Output Contact Operation ...........................................................................................10-3
Sequential Events Recorder (SER) .............................................................................10-3
Acceptance Testing.....................................................................................................................10-4
Equipment Required ...........................................................................................................10-4
Initial Checkout...................................................................................................................10-4
Power Supply ......................................................................................................................10-5
Serial Communications.......................................................................................................10-5
Outputs................................................................................................................................10-7
Inputs...................................................................................................................................10-7
Metering..............................................................................................................................10-8
Current Metering.........................................................................................................10-8
Voltage Metering ......................................................................................................10-10
Frequency Metering ..................................................................................................10-11
Volts/Hertz Metering ................................................................................................10-11
Winding Overcurrent ........................................................................................................10-11
Instantaneous Overcurrent Elements ........................................................................10-11
Definite-Time and Inverse-Time Overcurrent Elements ..........................................10-13
Phase Overcurrent Elements .....................................................................................10-15
Negative-Sequence Overcurrent Elements ...............................................................10-16
Residual Overcurrent Elements ................................................................................10-16
Torque-Control..........................................................................................................10-16
Combined Overcurrent Elements......................................................................................10-17
Restricted Earth Fault (REF) Function .............................................................................10-19
Differential........................................................................................................................10-21
U87P Unrestrained Differential Element..................................................................10-22
O87P Differential Element Pickup ...........................................................................10-23
SLP1 Restrained Differential Threshold...................................................................10-24
SLP2 Restrained Differential Threshold...................................................................10-26
Second-Harmonic Blocking......................................................................................10-28
Fifth-Harmonic Blocking..........................................................................................10-29
Harmonic Restraint ...................................................................................................10-30
Over-/Undervoltage Elements ..........................................................................................10-32
Frequency Elements..........................................................................................................10-36
Volts/Hertz Elements........................................................................................................10-37
Time-Code Input (IRIG-B)...............................................................................................10-42
Commissioning Testing............................................................................................................10-42
Maintenance Testing.................................................................................................................10-43