5-38 C30 Controller System GE Multilin5.2 PRODUCT SETUP 5 SETTINGS55.2.6 REAL TIME CLOCKPATH: SETTINGS PRODUCT SETUP REAL TIME CLOCKThe date and time can be synchronized a known time base and to other relays using an IRIG-B signal. It has the sameaccuracy as an electronic watch, approximately ±1 minute per month. If an IRIG-B signal is connected to the relay, only thecurrent year needs to be entered. See the COMMANDS SET DATE AND TIME menu to manually set the relay clock.The REAL TIME CLOCK EVENTS setting allows changes to the date and/or time to be captured in the event record.The LOCAL TIME OFFSET FROM UTC setting is used to specify the local time zone offset from Universal Coordinated Time(Greenwich Mean Time) in hours. This setting has two uses. When the C30 is time synchronized with IRIG-B, or has nopermanent time synchronization, the offset is used to calculate UTC time for IEC 61850 features. When the C30 is timesynchronized with SNTP, the offset is used to determine the local time for the C30 clock, since SNTP provides UTC time.The daylight savings time (DST) settings can be used to allow the C30 clock can follow the DST rules of the local timezone. Note that when IRIG-B time synchronization is active, the DST settings are ignored. The DST settings are used whenthe C30 is synchronized with SNTP, or when neither SNTP nor IRIG-B is used.Only timestamps in the event recorder and communications protocols are affected by the daylight savings time set-tings. The reported real-time clock value does not change. REAL TIME CLOCKIRIG-B SIGNAL TYPE:NoneRange: None, DC Shift, Amplitude ModulatedMESSAGE REAL TIME CLOCKEVENTS: DisabledRange: Disabled, EnabledMESSAGE LOCAL TIME OFFSETFROM UTC: 0.0 hrsRange: –24.0 to 24.0 hrs in steps of 0.5MESSAGE DAYLIGHT SAVINGSTIME: DisabledRange: Disabled, EnabledMESSAGE DST START MONTH:AprilRange: January to December (all months)MESSAGE DST START DAY:SundayRange: Sunday to Saturday (all days of the week)MESSAGE DST START DAYINSTANCE: FirstRange: First, Second, Third, Fourth, LastMESSAGE DST START HOUR:2:00Range: 0:00 to 23:00MESSAGE DST STOP MONTH:AprilRange: January to December (all months)MESSAGE DST STOP DAY:SundayRange: Sunday to Saturday (all days of the week)MESSAGE DST STOP DAYINSTANCE: FirstRange: First, Second, Third, Fourth, LastMESSAGE DST STOP HOUR:2:00Range: 0:00 to 23:00NOTE
