ABB 615 series Technical Manual page 493

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1MAC059074-MB A

615 series ANSI

Technical Manual

GUID-F1F4E199-8B6A-4066-ACCB-07FE4F887417 V3 EN

Example of connections to test the line differential protection relay

Secondary current injection

There are two alternative modes to check the operation of a line differential protection

relay. These are not exclusive methods for each other and can be used for various test on

the protection relay.

In normal mode, that is, the mode when the function is on normal operation, the local end

protection relay sends phasors to the remote end protection relay and receives phasors

measured by the remote end protection relay. This mode can be used in testing the

operating level and time of the low and high stages of the local end protection relay. This

is due to a test situation when the remote end does not measure any current and therefore,

all the current fed to the local end current circuit is seen as differential current at both ends.

Protection functions

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