Connections Between Autoreclosure And Overcurrent Functions - ABB RELION REB500 Technical Manual

1MRK 505 406-UEN B
IEC19000454 V1 EN-US
Figure 50: Distance protection and autoreclosure functions in different units
5.8.6.3

Connections between autoreclosure and overcurrent functions

To prevent the discrimination timer from operating, connect the overcurrent Trip signal to the
two inputs Start and Trip CB 3P of the autoreclosure function.
The time
(graded) overcurrent functions:
t
Close from AR function
In cases where the zone extension signal is used in conjunction with overcurrent functions, the
terms 'overreach' and 'underreach' have the following meanings:
• overreach: enabling of an overcurrent function having a short (non-graded) time delay.
• underreach: enabling of an overcurrent function having a long (graded) time delay.
Bay protection functions REB500
Technical manual
t Close must be set longer than the maximum operating time of the activated
> t
max. overcurrent time delay
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Bay protection functions
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Section 5
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