ABB REX 521 Technical Reference Manual, Standard Configurations

10
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
11.5.1.Features ........................................................................220
11.5.2.Measurements ...............................................................222
11.5.3.Protection ......................................................................222
11.5.3.1.Phase overcurrent protection ..........................222
11.5.3.2.Earth fault protection .......................................222
11.5.3.3.Overvoltage and undervoltage protection ........222
11.5.4.Connections ...................................................................223
11.5.4.1.Protection signal routing ..................................223
11.5.4.2.Indication and control connections ..................224
11.5.5.Implementations ............................................................ 224
11.5.5.1.Blocking signal received from the outgoing
feeder ...............................................................224
11.5.5.2.Outgoing blocking signal to the overcurrent
relay on the HV side ........................................224
11.5.5.3.Earth fault stage Io>>> to trip the breaker on
the HV side of the transformer .........................224
11.5.5.4.Circuit-breaker failure protection ......................224
11.5.5.5.Disturbance recorder .......................................224
11.5.5.6.Power quality ...................................................225
11.6.Measurement cubicle, High H06 ..............................................226
11.6.1.Features ........................................................................226
11.6.2.Measurements ...............................................................228
11.6.3.Protection ......................................................................228
11.6.3.1.Residual voltage protection .............................228
11.6.3.2.Overvoltage and undervoltage protection ........228
11.6.3.3.Underfrequency protection ..............................229
11.6.4.Connections ...................................................................229
11.6.4.1.Protection signal routing ..................................229
11.6.4.2.Indication and control connections ..................230
11.6.5.Implementations ............................................................ 231
11.6.5.1.Disturbance recorder .......................................231
11.6.5.2.Power quality ...................................................231
11.7.Motor protection, High H07 ......................................................232
11.7.1.Features ........................................................................232
11.7.2.Measurements ...............................................................235
11.7.3.Protection ......................................................................235
11.7.3.1.Thermal overload protection ............................235
11.7.3.2.Start-up supervision (stall protection) ..............236
11.7.3.3.Cumulative start-up counter .............................236
11.7.3.4.Short-circuit (high-set overcurrent) protection .238
11.7.3.5.Unbalance protection .......................................238
11.7.3.6.Phase reversal protection ................................239
11.7.3.7.Undercurrent protection ...................................239

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English