Clock - GE SR345 Instruction Manual

S1 RELAY SETUP

Clock

6–6
Courtesy of NationalSwitchgear.com
The 345 relay has an internal real time clock that performs time stamping via IRIG-B for
various features such as the event and transient recorders. This time stamping is available
with the IRIG-B signal connected to the relay terminals and set to "Enabled". When an IRIG-
B device is connected to the relay terminals, the relay detects the DC shift or the Amplitude
Modulated signal automatically. Time stamping on multiple relays can be synchronized to
± 1.0 ms with the use of IRIG-B input. Time stamping is also optionally available using SNTP.
Time synchronization priority uses the IRIG-B and SNTP protocols - via Modbus, IEC60870-
5-103, IEC60870-5-104, or DNP commands - as follows:
IRIG-B has the highest priority, so any other source of synchronization should be rejected if
IRIG-B is the synchronization source and an IRIG-B signal is available.
SNTP has the second highest priority, so if IRIG-B is not the synchronization source but
SNTP is, then any other source of synchronization should be rejected.
Synchronization commands are all eventually translated into a MODBUS function, and as
such are blocked from the MODBUS layer as required.
Any synchronization commands other than Modbus, IEC60870-5-103, IEC60870-5-104, or
DNP will be accepted only if IRIG-B and SNTP are not the synchronization sources. There is
no prioritization amongst synchronization commands. A synchronization command issued
from DNP for example, can be directly followed by another from MODBUS, for example.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH: SETPOINTS > S1 RELAY SETUP > CLOCK
DATE: (MM/DD/YYYY)
Range: Month: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec Day: 1 to 31 Year:
2009 to 2099
Default: Jan 15 2009
This setting sets the date in the specified format.
TIME: (HH:MM:SS)
Range: 0 to 23: 0 to 59: 0 to59
Default: 03:15:50
This setting sets the time in the specified format.
DLS ENABLE
Range: Disabled, Enabled
Default: Disabled
With DLS Enabled, the main CPU has to maintain the information regarding
AV.m_DaylightSavingsActive, because it is necessary in the comms CPU to translate
from localtime to UTC in 61850 protocol. In addition, if SNTP is enabled, the main CPU will
receive UTC time from comms CPU and it needs to apply this in order to pass it to
localtime.
Without any other synchronization, DLS correction is applied only at 0200 hours on
daylight saving months.
PATH:
SETPOINTS > S1 RELAY SETUP > CLOCK > DLS ENABLE [ENABLED]
DLS START MONTH:
Range: Not Set, January, February, March, April, May, June, July, August, September,
October, November, December
Default: Not Set
This setting sets the month for the DLS start time.
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS