ABB REX 521 Technical Reference Manual, Standard Configurations page 7

1MRS 751802-MUM Protection Relay
Technical Reference Manual, Standard Configurations
9.4.6.1. Definite Trip alarm to output relay ....................141
9.4.6.2. Digital input to initiate auto-reclosing function ..142
10.Application examples, Medium ...........................................143
10.1.Outgoing feeder, Medium M01 .................................................143
10.1.1.Features .........................................................................143
10.1.2.Measurement connections .............................................145
10.1.3.Protection .......................................................................145
10.1.3.1.Directional earth-fault protection ......................146
10.1.3.2.Protection signal routing ..................................146
10.1.3.3.Indication and control connections ...................146
10.1.4.Implementations .............................................................147
10.1.4.1.Basic angle control by digital input ...................147
10.1.4.2.Outgoing blocking signal to the incoming
10.1.4.3.Trip-alarm signals from overcurrent and
10.1.4.4.Circuit-breaker failure protection ......................148
10.1.4.5.Trip-circuit supervision .....................................149
10.2.Incoming feeder, Medium M01 .................................................150
10.2.1.Features .........................................................................150
10.2.2.Measurement connections .............................................152
10.2.3.Protection .......................................................................152
10.2.3.1.Overcurrent protection .....................................153
10.2.3.2.Residual voltage protection ..............................153
10.2.4.Connections ...................................................................153
10.2.4.1.Protection signal routing ..................................153
10.2.4.2.Indication and control connections ...................153
10.2.5.Implementations .............................................................154
10.2.5.1.Start signal from the second residual voltage
10.2.5.2.Blocking signal received from the outgoing
10.2.5.3.Outgoing blocking signal to the overcurrent
10.2.5.4.Trip signal from second residual voltage stage 155
10.2.5.5.Second settings for residual voltage protection 155
10.2.5.6.Circuit-breaker failure protection ......................155
10.2.5.7.Trip-circuit supervision .....................................156
10.3.Outgoing feeder, Medium M02 .................................................158
10.3.1.Features .........................................................................158
10.3.2.Measurement connections .............................................160
10.3.3.Protection .......................................................................160
feeder ...............................................................148
earth-fault .........................................................148
stage to release blocking .................................154
feeder ...............................................................154
relay on the HV side .........................................154
REX 521
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