Operation Principle - ABB RET650 Technical Manual

Relion 650 series transformer protection

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Basic IED functions

Operation principle

The Denial of service functions (DOSLAN1 and DOSFRNT) measures the IED load

from communication and, if necessary, limit it for not jeopardizing the IEDs control

and protection functionality due to high CPU load. The function has the following

LINKUP indicates the Ethernet link status

WARNING indicates that communication (frame rate) is higher than normal

ALARM indicates that the IED limits communication

1MRK 504 135-UEN A

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