GE G30 Instruction Manual page 324

PRODUCT SETUP
To enable IRIG-B synchronization, the input
synchronization can be disabled by making this setting None.
Clocks can be synchronized locally among several relays using the computer time. When using a time source, such as IRIG-
B, the time is overwritten eventually by the time source. To synchronize clocks among UR devices:
1. In the EnerVista software, expand the main menu in the Online Window area and select the Synchronize Devices
entry. The window opens. The software prompts to acknowledge any offline devices.
2. Click the Synchronize Devices button at the top of the window, and confirm the action at the prompt. The devices
assume the time of the computer being used.
To configure and enable PTP and/or SNTP, or to set local time parameters (for example time zone, daylight savings), use the
following sections.
5.3.7.2 Precision time protocol (1588)
SETTINGS  PRODUCT SETUP  REAL TIME CLOCK  PRECISION TIME PROTOCOL (1588)
 PRECISION TIME
 PROTOCOL (1588)
5
SETTINGS  PRODUCT SETUP  REAL TIME CLOCK  PRECISION TIME PROTOCOL (1588)  PTP PORT 1(3)
 PTP PORT 1

The G30 is provided with optional Precision Time Protocol capability. This feature is specified as the IEEE 1588
software option at the time of ordering. See the Order Codes section in chapter 2 for details.
The G30 supports the Precision Time Protocol (PTP) specified in IEEE Std 1588 2008 using the Power Profile (PP) specified in
IEEE Std C37.238 2011. This enables the relay to synchronize to the international time standard over an Ethernet network
that implements PP.
The relay can be configured to operate on some PTP networks that are not strictly PP. Time accuracy can be less than
specified for a PP network. Tolerated deviations from strict PP include 1) missing declaration of PP compliance in the
messages, 2) connection to a network device that does not support the PTP peer delay mechanism, 3) jitter substantially
greater 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), sometimes referred to as
version 2 PTP. It does not support the previous version of the standard (version 1).
PTP is a protocol that allows multiple clocks in a network to synchronize with one another. It permits synchronization
accuracies better than 1 ns, but this requires that each and every component in the network achieve very high levels of
accuracy and a very high baud rate, faster than normally used for relay communications. When operating over a generic
Ethernet network, time error can amount to 1 ms or more. PP is a profile of PTP which specifies a limited subset of PTP
5-110
must be set to DC Shift or Amplitude Modulated. IRIG-B
IRIG-B SIGNAL TYPE
STRICT POWER

PROFILE: Disabled
PTP DOMAIN NUMBER:

0
PTP VLAN PRIORITY:

4
PTP VLAN ID:

0
 PTP PORT 1


PORT 1 PTP FUNCTION:

Disabled
PORT 1 PATH DELAY

ADDER: 0 ns
PORT 1 PATH DELAY

ASYMMETRY: 0 ns
Range: Enabled, Disabled
Range: 0 to 255
Range: 0 to 7
Range: 0 to 4095
See below
Range: Enabled, Disabled
Range: 0 to 60000 ns in steps of 1
Range: –1000 to +1000 ns in steps of 1
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS