GE B90 UR Series, Instruction Manual

Page: 154 / 478

5-40 B90 Low Impedance Bus Differential System GE Multilin
5.2 PRODUCT SETUP 5 SETTINGS
5
The 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-backed
clock, which has the same accuracy as an electronic watch, approximately ±1 minute per month (~23 ppm). Once the RTC
is 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
available external time sources synchronizes the RTC and the synchrophasor clock. A setting of None causes the RTC and
the synchrophasor clock to free-run. A setting of PP/IRIGB/PTP/SNTP, IRIGB/PP/PTP/SNTP, or PP/PTP/IRIGB/SNTP
causes the relay to track the first source named that is enabled and operational, or free-run if none of these are available.
Here, PP means a time source that is strictly compliant with PP, PTP means a time source that is not strictly compliant with
PP. When a time source fails or recovers, the relay automatically transfers synchronization as required by this setting.
See the
COMMANDS

SET DATE AND TIME
menu item 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
event records 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 using the
Settings > Product Setup > Real Time Clock > IRIG-B > IRIG-B Signal Type setting. IRIG-B synchronization can be dis-
abled 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), use
the 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)

PRECISION TIME

PROTOCOL (1588)
See below
EE
MESSAGE

SNTP PROTOCOL

See below
MESSAGE

LOCAL TIME

See below

PRECISION TIME

PROTOCOL (1588)
STRICT POWER PROFILE:
Disabled
Range: Enabled, Disabled
MESSAGE
PTP DOMAIN NUMBER
0
Range: 0 to 255
MESSAGE
PTP VLAN PRIORITY
4
Range: 0 to 7
PTP VLAN ID
0
Range: 0 to 4095
MESSAGE

PTP PORT 1

MESSAGE
PORT 1 PTP FUNCTION:
Disabled
Range: Enabled, Disabled
MESSAGE
PORT 1 PATH DELAY
ADDER:
00000 ns
Range: 0 to 60 000 ns in steps of 1
MESSAGE
PORT 1 PATH DELAY
ASYMMETRY:
0000 ns
Range: –1 000 to +1 000 ns in steps of 1