ABB RELION 650 SERIES, Technical Manual

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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
M11346-74 v5
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
the spike filter. The third pulse will give the IED a good time, and will reset the
time so that the fourth pulse will occur on a minute border. After the first three
minutes, the time in the IED will be good if the coarse time is set properly via the
HMI or if the RTC backup still keeps the time since last up-time. If the minute
pulse is removed, for example, for an hour, the internal time will drift by maximum
the error rate in the internal clock. If the minute pulse is returned, the first pulse is
automatically rejected. The second pulse will possibly be rejected due to the spike
filter. The third pulse will set the time if the time offset is more than 500 ms or
adjust the time if the time offset is small enough. If the time is set, the application
will be brought to a safe state before the time is set. If the time is adjusted, the time
will reach its destination within one minute.
Synchronization via IRIG-B module
M11346-146 v8
IRIG-B is a protocol used only for time synchronization. A clock can provide local
time of the year in this format. The “B” in IRIG-B states that 100 bits per second
are transmitted and the message is sent every second. After IRIG-B there are
numbers stating if and how the signal is modulated and the information
transmitted.
To receive IRIG-B there are two connectors in the IRIG-B module, one galvanic
BNC connector and one optical ST connector. IRIG-B 12x messages can be
supplied via the galvanic interface, and IRIG-B 00x messages can be supplied via
either the galvanic interface or the optical interface, where x (in 00x or 12x) means
a number in the range of 0-7.
“00” means that a base band is used, and the information can be fed into the IRIG-
B module via the BNC contact or an optical fiber. “12” means that a 1 kHz
modulation is used. In this case the information must go into the module via the
BNC connector.
If the x in 00x or 12x is 4, 5, 6 or 7, the time message from IRIG-B contains
information of the year. If the x is 0, 1, 2 or 3, the information contains only the
time within the year, and year information has to be set via PCM600 or local HMI.
1MRK 506 382-UEN A
Section 19
Basic IED functions
Line distance protection REL650 2.2 IEC 807
Technical manual