User`s manual

PT-G7509 User’s Manual Featured Functions
3-11
Time Server IP/Name
Setting Description Factory Default
IP address or name of time
server
This is the IP or domain address (e.g.,
192.168.1.1, time.stdtime.gov.tw, or
time.nist.gov).
None
IP address or name of
secondary time server
The PT-G7509 will try to locate the secondary
NTP server if the first NTP server fails to
connect.
Time Server Query Period
Setting Description Factory Default
Query period This parameter determines how frequently the
time is updated from the NTP server.
600 seconds
Enable NTP/SNTP Server
Setting Description Factory Default
Enable/Disable This enables or disables NTP or SNTP server. Disable
NOTE
The PT-G7509 has a real time clock so the user doesn’t need to update the Current Time and
Current Date to set the initial time for the PT-G7509 after each reboot, especially when the
network does not have an Internet connection for an NTP server or there is no NTP server on the
LAN.
Configuring IEEE 1588/PTP
Time synchronization may be accomplished using the IEEE Standard for a Precision Clock
Synchronization Protocol for Networked Measurement and Control Systems (IEEE
1588-2008) to synchronize real-time clocks incorporated within each component of the electrical
power device in power automation applications. For IEC 61850-9 operations, digital CTs and PTs
provide measured values of current and voltage through MUs to bay level IEDs with the process
bus. In any given system there may be a great number of MUs operating at once. These different
streams of sampled values must be accurately time-synchronized before they can be used.
SNTP is able to provide synchronization accuracy within about 1 ms. However, this is not precise
enough for raw data sampled values. Moxa’s PT-G7509-PTP IEC 61850-3 fast Ethernet switches
support the latest version of IEEE 1588 v2 technology to fulfill precise time synchronization
requirements for protection and control applications. These Ethernet switches guarantee
time-stamping accuracy within 1 μs for the IEC 61850 process layer. They can be configured for
1558 v2 Master, Boundary Clock, and Transparent Clock functionality.
Grandmaster Clock:
Determines the time
base for the system
Boundary or
Transparent Clock:
Slave to the grandmaster clock
and master to its slave Ordinary Clock:
Slave to its master
PowerTrans Series
Ethernet Switch w/ IEEE 1588
End Device
w/ IEEE 1588