ABB REB670 Applications Manual page 496

Busbar protection 2.1 ansi, relion 670 series

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Table of Contents

Requirements

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Maximum channel delay

Loop time <40 ms continuous (2 x 20 ms)

IED with echo synchronization of differential clock (without GPS clock)

Both channels must have the same route with maximum asymmetry of 0,2-0,5 ms,

depending on set sensitivity of the differential protection.

A fixed asymmetry can be compensated (setting of asymmetric delay in built in HMI

or the parameter setting tool PST).

IED with GPS clock

Independent of asymmetry.

1MRK 505 337-UUS -

Application manual