GE T35 UR Series, Instruction Manual

Page: 174 / 568

5-52 T35 Transformer Protection System GE Multilin
5.2 PRODUCT SETUP 5 SETTINGS
5
c) SNTP PROTOCOL
PATH: SETTINGS

PRODUCT SETUP

REAL TIME CLOCK

SNTP PROTOCOL
The T35 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the T35 can obtain clock time over
an Ethernet network. The T35 acts as an SNTP client to receive time values from an SNTP/NTP server, usually a dedicated
product using a GPS receiver to provide an accurate time. UR series relays support unicast, broadcast, multicast, and any-
cast SNTP functionality.
The
SNTP FUNCTION
setting enables or disabled the SNTP feature on the T35.
To use SNTP in unicast mode,
SNTP SERVER IP ADDR
must be set to the SNTP/NTP server IP address. Once this address is
set and
SNTP FUNCTION
is “Enabled,” the T35 attempts to obtain time values from the SNTP/NTP server. Since many time
values are obtained and averaged, it generally takes three to four minutes until the T35 clock is closely synchronized with
the SNTP/NTP server. It takes up to two minutes for the T35 to signal an SNTP self-test error if the server is offline.
To use SNTP in broadcast mode, set the
SNTP SERVER IP ADDR
setting to “0.0.0.0” and
SNTP FUNCTION
to “Enabled.” The
T35 then listens to SNTP messages sent to the “all ones” broadcast address for the subnet. The T35 waits up to 18 minutes
(>1024 seconds) without receiving an SNTP broadcast message before signaling an SNTP self-test error.
The
SNTP UDP PORT NUMBER
is 123 for normal SNTP operation. If SNTP is not required, close the port by setting it to 0.
When the
SNTP UDP PORT NUMBER
is set to 0, the change takes effect when the T35 is restarted.
d) LOCAL TIME
PATH: SETTINGS

PRODUCT SETUP

REAL TIME CLOCK

LOCAL TIME

SNTP PROTOCOL

SNTP FUNCTION:
Disabled
Range: Enabled, Disabled
MESSAGE
SNTP SERVER IP ADDR:
0.0.0.0
Range: Standard IP address format
MESSAGE
SNTP UDP PORT
NUMBER: 123
Range: 0 to 65535 in steps of 1

LOCAL TIME

LOCAL TIME OFFSET
FROM UTC: 0.0 hrs
Range: –24.0 to 24.0 hrs in steps of 0.5
MESSAGE
DAYLIGHT SAVINGS
TIME: Disabled
Range: Disabled, Enabled
MESSAGE
DST START MONTH:
January
Range: January to December (all months)
MESSAGE
DST START DAY:
Sunday
Range: Sunday to Saturday (all days of the week)
MESSAGE
DST START DAY
INSTANCE: First
Range: First, Second, Third, Fourth, Last
MESSAGE
DST START HOUR:
2
Range: 0 to 23
MESSAGE
DST STOP MONTH:
January
Range: January to December (all months)
MESSAGE
DST STOP DAY:
Sunday
Range: Sunday to Saturday (all days of the week)
MESSAGE
DST STOP DAY
INSTANCE: First
Range: First, Second, Third, Fourth, Last
MESSAGE
DST STOP HOUR:
2
Range: 0 to 23
NOTE