ABB REL 551 2.3 Series Installation And Comissioning Manual page 42

Line differential protection terminal
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&KDSWHU 
Checking the power supply
&KHFNLQJ WKH H[WHUQDO FLUFXLWU\

&KHFNLQJ WKH SRZHU VXSSO\
Check that the value of the auxiliary supply voltage remains within the permissible
range under all operating conditions. Check that the polarity is correct.
36

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