ABB Relion 650 Series Technical Manual page 579

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Table of Contents

1MRK 506 326-UUS B

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 outputs:

LINKUP indicates the Ethernet link status

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

ALARM indicates that the IED limits communication

Line distance protection REL650

Technical manual

Basic IED functions

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