ABB Relion 650 Series Technical Manual page 628

Section 15
Basic IED functions
622
The definition of a minute pulse is that it occurs one minute after the last pulse. As
only the flanks are detected, the flank of the minute pulse shall occur one minute
after the last flank.
Binary minute pulses are checked with reference to frequency.
Pulse data:
• Period time (a) should be 60 seconds.
• Pulse length (b):
• Minimum pulse length should be >50 ms.
• Maximum pulse length is optional.
• Amplitude (c) - please refer to section
Deviations in the period time (a) larger than 50 ms will cause TSYNCERR.
b
c
IEC05000251 V1 EN-US
Figure 278: Binary minute pulses
The default time-out-time for a minute pulse is two minutes, and if no valid minute
pulse is received within two minutes a SYNCERR will be given.
If contact bounce occurs, only the first pulse will be detected as a minute pulse.
The next minute pulse will be registered first 60 s - 50 ms after the last contact
bounce.
If the minute pulses are perfect, for example, it is exactly 60 seconds between the
pulses, contact bounces might occur 49 ms after the actual minute pulse without
effecting the system. If contact bounce occurs more than 50 ms, for example, it is
less than 59950 ms between the two most adjacent positive (or negative) flanks, the
minute pulse will not be accepted.
Binary synchronization example
An IED is configured to use only binary input for time synchronization, and a valid
binary input is applied to a binary input card. The HMI is used to tell the IED the
approximate time, and the minute pulse is then used to synchronize the IED.
Minute pulse means that each pulse occurs one minute after the previous pulse, so
the first pulse is not used at all. The second pulse will probably be rejected due to
"Binary input module
a
en05000251.vsd
1MRK 511 424-UEN B
(BIM)".
M11346-74 v5
Bay control REC650 2.2 IEC
Technical manual