ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS751802-MUM
REX 521
11
Protection Relay
Technical Reference Manual, Standard Configurations
11.7.3.8.Fuse fail protection ...........................................239
11.7.4.Condition monitoring ......................................................239
11.7.4.1.Operation time counter ....................................239
11.7.5.Connections ...................................................................240
11.7.5.1.Protection signal routing ..................................240
11.7.5.2.Indication and control connections ...................240
11.7.5.3.Indication of motor status .................................240
11.8.Incoming feeder, High H08/H09 ...............................................241
11.8.1.Features .........................................................................241
11.8.2.Measurements ...............................................................243
11.8.3.Protection .......................................................................243
11.8.3.1.Phase overcurrent protection ...........................243
11.8.3.2.Earth fault protection ........................................243
11.8.3.3.Overvoltage and undervoltage protection ........243
11.8.4.Connections ...................................................................244
11.8.4.1.Protection signal routing ..................................244
11.8.4.2.Indication and control connections ...................245
11.8.5.Implementations .............................................................245
11.8.5.1.Blocking signal received from the outgoing
feeder ...............................................................245
11.8.5.2.Outgoing blocking signal to the overcurrent
relay on the HV side .........................................245
11.8.5.3.Earth fault stage Io>>> to trip the breaker on
the HV side of the transformer .........................245
11.8.5.4.Circuit-breaker failure protection ......................245
11.8.5.5.Disturbance recorder .......................................245
11.8.5.6.Power quality ...................................................246
12.Symbol notations .................................................................247

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English