5-58 F60 Feeder Protection System GE Multilin5.2 PRODUCT SETUP 5 SETTINGS5The relay contains a real time clock (RTC) to create timestamps for communications protocols as well as for historical data,such as event records and oscillography. When the relay restarts, the RTC initializes from an onboard battery-backedclock, which has the same accuracy as an electronic watch, approximately ±1 minute per month (~23 ppm). Once the RTCis synchronized with the Precision Time Protocol (PTP), IRIG-B, or SNTP, its accuracy approaches that of the synchroniz-ing time delivered to the relay.The SYNCHRONIZING SOURCE setting configures the priority sequence that the relay uses to determine which of the avail-able external time sources synchronizes the RTC and the synchrophasor clock. A setting of None causes the RTC and thesynchrophasor clock to free-run. A setting of PP/IRIGB/PTP/SNTP, IRIGB/PP/PTP/SNTP, or PP/PTP/IRIGB/SNTP causesthe relay to track the first source named that is enabled and operational, or free-run if none of these are available. Here, PPmeans a time source that is strictly compliant with PP, PTP means a time source that is not strictly compliant with PP. Whena time source fails or recovers, the relay automatically transfers synchronization as required by this setting.See the COMMANDS SET DATE AND TIME menu section of this manual to manually set the RTC.The REAL TIME CLOCK EVENTS setting allows changes to the date and/or time to be captured in the event record. The eventrecords the RTC time before the adjustment.To enable IRIG-B synchronization, the input IRIG-B SIGNAL TYPE must be set to DC Shift or Amplitude Modulated. IRIG-Bsynchronization can be disabled by making this setting None.To configure and enable PTP and/or SNTP, or to set local time parameters (for example time zone, daylight savings), usethe following sections.b) PRECISION TIME PROTOCOL (1588)PATH: SETTINGS PRODUCT SETUP REAL TIME CLOCK PRECISION TIME PROTOCOL (1588)PATH: SETTINGS PRODUCT SETUP REAL TIME CLOCK PRECISION TIME PROTOCOL (1588) PTP PORT 1(3)The UR supports the Precision Time Protocol (PTP) specified in IEEE Std 1588 2008 using the Power Profile (PP) specifiedin IEEE Std C37.238 2011. This enables the relay to synchronize to the international time standard over an Ethernet net-work that implements PP.The relay can be configured to operate on some PTP networks that are not strictly PP. Time accuracy can be less thanspecified for a PP network. Tolerated deviations from strict PP include 1) missing declaration of PP compliance in the mes-sages, 2) connection to a network device that does not support the PTP peer delay mechanism, 3) jitter substantiallygreater than 1 μs in received event messages, and 4) certain non-compliant announce and sync message update rates.The relay implements PTP according to IEEE Std 1588 2008 and the equivalent IEC 61588:2009(E), sometimesreferred to as version 2 PTP. It does not support the previous version of the standard (version 1). PRECISION TIME PROTOCOL (1588)STRICT POWER PROFILE:DisabledRange: Enabled, DisabledMESSAGE PTP DOMAIN NUMBER0Range: 0 to 255MESSAGE PTP VLAN PRIORITY4Range: 0 to 7PTP VLAN ID0Range: 0 to 4095MESSAGE PTP PORT 1MESSAGE PORT 1 PTP FUNCTION:DisabledRange: Enabled, DisabledMESSAGE PORT 1 PATH DELAYADDER: 00000 nsRange: 0 to 60 000 ns in steps of 1MESSAGE PORT 1 PATH DELAYASYMMETRY: 0000 nsRange: –1 000 to +1 000 ns in steps of 1NOTE
