GE C70 Instruction Manual page 7

TABLE OF CONTENTS
7 COMMANDS AND
TARGETS
8 APPLICATION OF
SETTINGS
9 THEORY OF
OPERATION
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM - INSTRUCTION MANUAL
6.4.4 Data logger .............................................................................................................................6-21
6.5 Product information ...................................................................................... 6-22
6.5.1 Model information................................................................................................................6-22
6.5.2 Firmware revisions ..............................................................................................................6-22
7.1 Commands menu ............................................................................................. 7-1
7.1.1 Capacitor bank automatic setting ................................................................................. 7-2
7.1.2 Virtual inputs ............................................................................................................................ 7-6
7.1.3 Clear records ............................................................................................................................ 7-6
7.1.4 Set date and time................................................................................................................... 7-7
7.1.5 Relay maintenance................................................................................................................ 7-7
7.1.6 Security ....................................................................................................................................... 7-8
7.2 Targets menu .................................................................................................... 7-9
7.2.1 Target messages .................................................................................................................... 7-9
7.2.2 Relay self-tests ........................................................................................................................ 7-9
8.1 Arrangement of shunt capacitor banks....................................................... 8-1
8.1.1 Overview..................................................................................................................................... 8-1
8.1.2 Externally fused capacitors ............................................................................................... 8-1
8.1.3 Internally fused capacitors ................................................................................................ 8-2
8.1.4 Fuseless capacitors............................................................................................................... 8-2
8.1.5 Unfused capacitors ............................................................................................................... 8-3
8.2 Connections of shunt capacitor banks......................................................... 8-3
8.2.1 Grounded wye-connected banks ................................................................................... 8-3
8.2.2 Ungrounded wye-connected banks.............................................................................. 8-3
8.2.3 Delta connected banks........................................................................................................ 8-4
8.2.4 H-configuration....................................................................................................................... 8-4
8.2.5 Tapped configuration........................................................................................................... 8-4
8.2.6 Summary.................................................................................................................................... 8-4
8.3 Protection methods for capacitor banks ..................................................... 8-5
8.3.1 Overview..................................................................................................................................... 8-5
8.3.2 Capacitor unbalance protection..................................................................................... 8-5
8.3.3 Protection for rack faults (arc-over within capacitor banks) ...........................8-10
8.3.4 Overvoltage.............................................................................................................................8-10
8.3.5 Overcurrent.............................................................................................................................8-11
8.3.6 Loss of bus voltage..............................................................................................................8-11
8.4 Settings example ............................................................................................ 8-11
8.4.1 Overview...................................................................................................................................8-11
8.4.2 VT and CT setup ....................................................................................................................8-12
8.4.3 Source assignment..............................................................................................................8-13
8.4.4 Bank unbalance calculations .........................................................................................8-14
8.4.5 Bank voltage differential settings.................................................................................8-16
8.4.6 Bank phase current unbalance settings ...................................................................8-18
8.4.7 Bank phase overvoltage settings .................................................................................8-19
8.4.8 Bank phase undervoltage settings ..............................................................................8-20
8.4.9 Bank overcurrent protection...........................................................................................8-21
9.1 Overview ............................................................................................................ 9-1
9.1.1 General operation .................................................................................................................. 9-1
9.1.2 Bank phase overvoltage (ANSI 59B) .............................................................................. 9-1
9.1.3 Voltage differential (ANSI 87V) ......................................................................................... 9-3
9.1.4 Compensated bank neutral voltage unbalance (ANSI 59NU) ........................... 9-7
9.1.5 Phase current unbalance (ANSI 60P)...........................................................................9-10
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