ABB REC670 Applications Manual page 645

1MRK 511 401-UUS A
Bay control REC670 2.2 ANSI
Application manual
• Format: Transparent
• 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.
Section 24
Requirements
639