ABB REL 551-C1 2.3 Series Installation And Commissioning Manual page 73

Line differential protection terminal
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Overview
Chapter 11
Verifying settings by secondary
injection
All used setting groups should be tested.
Note!
This terminal is designed for a maximum continuous current of four times the nominal
current.
Note!
Please observe the measuring accuracy of the terminal, the test equipment and the an-
gular accuracy for both of them.
Note!
Please consider the configured logic from the function block to the output contacts
when measuring the operate time.
67

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