Oscillography - GE C30 Instruction Manual

PRODUCT SETUP
The C30 maintains two times: local time and Universal Coordinated Time (UTC). Local time can be provided by IRIG-B
signals. UTC time is provided by SNTP servers.
The real-time clock (RTC) and timestamps reported in historical records and communication protocols can be incorrect if
the Local Time settings are not configured properly.
LOCAL TIME OFFSET FROM UTC
zones in the eastern hemisphere have positive values; time zones in the western hemisphere have negative values. A value
of zero causes the relay to use UTC for local time. This setting has two uses. When the system RTC is synchronized with a
communications protocol providing only local time or it is free-running, the offset setting is used to calculate UTC from the
local time these provide. When the RTC is synchronized with a communications protocol providing only UTC (such as PTP or
SNTP), the time offset setting is used to determine local time from the UTC provided. PTP
ALTERNATE_TIME_OFFSET_INDICATOR TLVs are not used to calculate local time. When a communications protocol other
than PTP provides UTC to local time offset (meaning IRIG-B), that offset is used instead of the local time and daylight time
settings.
DAYLIGHT SAVINGS TIME
when IRIG-B time synchronization is active, the local time in the IRIG-B signal contains any daylight savings time offset and
so the DST settings are ignored.

5.3.7 Oscillography

5
5.3.7.1 Menu
SETTINGS  PRODUCT SETUP  OSCILLOGRAPHY
 OSCILLOGRAPHY

Oscillography records contain waveforms captured at the sampling rate as well as other relay data at the point of trigger.
Oscillography records are triggered by a programmable FlexLogic operand. Multiple oscillography records can be captured
simultaneously.
The
NUMBER OF RECORDS
other factors, such as sample rate and the number of operational modules. There is a fixed amount of data storage for
oscillography; the more data captured, the less the number of cycles captured per record. See the
RECORDS  OSCILLOGRAPHY
configurations with corresponding cycles/record. The minimum number of oscillographic records is three.
5-82
DST STOP DAY

INSTANCE: First
DST STOP HOUR:

2:00
— Used to specify the local time zone offset from UTC (Greenwich Mean Time) in hours. Time
and — Can be used to allow the relay to follow the DST rules of the local time zone. Note that
DST
NUMBER OF RECORDS:

15
TRIGGER MODE:

Automatic Overwrite
TRIGGER POSITION:

50%
TRIGGER SOURCE:

Off
AC INPUT WAVEFORMS:

16 samples/cycle
 DIGITAL CHANNELS


 ANALOG CHANNELS


is selectable, but the number of cycles captured in a single record varies considerably based on
menu to view the number of cycles captured per record. The following table provides sample
CHAPTER 5: SETTINGS
Range: First, Second, Third, Fourth, Last
Range: 0:00 to 23:00
Range: 1 to 64 in steps of 1
Range: Automatic Overwrite, Protected
Range: 0 to 100% in steps of 1
Range: FlexLogic operand
Range: Off; 8, 16, 32, 64 samples/cycle
See below
See below
ACTUAL VALUES 
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL