21.11.2 Setting guidelines M15260-3 v7Remember always that there are two possible ways to place the IED in theTestMode= On” state. If, the IED is set to normal operation (TestMode = Off), butthe functions are still shown being in the test mode, the input signal IED_TEST onthe TESTMODE function block is activated in the configuration.Forcing of binary input and output signals is only possible when the IED is in IEDtest mode.21.12 Time synchronization TIMESYNCHGEN IP1750-1 v221.12.1 Application M11345-3 v11Use time synchronization to achieve a common time base for the IEDs in aprotection and control system. This makes it possible to compare events anddisturbance data between all IEDs in the system.Time-tagging of internal events and disturbances are an excellent help whenevaluating faults. Without time synchronization, only the events within one IEDcan be compared with each other. With time synchronization, events anddisturbances within the whole network, can be compared and evaluated.In the IED, the internal time can be synchronized from the following sources:• BIN (Binary Minute Pulse)• DNP• IEC103• SNTP• IRIG-B• SPA• LON• PPS• IEEE 1588 (PTP)For time synchronization of line differential protection with diff communication inGPS-mode, a GPS-based time synchronization is needed. This can be optical IRIG-B with 1344 from an external GPS-clock.Out of these, LON and SPA contains two types of synchronization messages:• Coarse time messages are sent every minute and contain complete date andtime, that is year, month, day, hour, minute, second and millisecond.• Fine time messages are sent every second and comprise only seconds andmilliseconds.The selection of the time source is done via the corresponding setting.1MRK 505 393-UEN B Section 21Basic IED functionsLine differential protection RED650 2.2 IEC 417Application manual
