Oscillography - GE N60 Instruction Manual

CHAPTER 5: SETTINGS

5.3.9 Oscillography

5.3.9.1 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 is selectable, but the number of cycles captured in a single record varies considerably based on
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.
Table 5-13: Oscillography cycles/record example
Records CT/VTs
3 1
3 1
16 1
16 1
32 1
32 1
3 2
3 2
16 2
— A new record automatically overwrites an older record when
TRIGGER MODE
Overwrite."
— Set this to a percentage of the total buffer size (for example, 10%, 50%, 75%, and so on). A trigger
TRIGGER POSITION
position of 25% consists of 25% pre- and 75% post-trigger data.
— Always captured in oscillography and can be any FlexLogic parameter (element state, contact input,
TRIGGER SOURCE
virtual output, and so on). The relay sampling rate is 64 samples per cycle.
— Determines the sampling rate at which AC input signals (that is, current and voltage) are stored.
AC INPUT WAVEFORMS
Reducing the sampling rate allows longer records to be stored. This setting has no effect on the internal sampling rate of
the relay, which is always 64 samples per cycle. That is, it has no effect on the fundamental calculations of the device.
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
NUMBER OF RECORDS:

15
TRIGGER MODE:

Automatic Overwrite
TRIGGER POSITION:

50%
TRIGGER SOURCE:

Off
AC INPUT WAVEFORMS:

16 samples/cycle
 DIGITAL CHANNELS


 ANALOG CHANNELS


menu to view the number of cycles captured per record. The following table provides sample
Sample rate Digital
channels
32 32
64 32
32 32
64 32
32 32
64 32
32 32
64 32
32 32
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
Analog Cycles per
channels record
16 2399
16 1450
16 666
16 402
16 352
16 213
16 1516
16 851
16 421
TRIGGER MODE
PRODUCT SETUP
ACTUAL VALUES 
is set to "Automatic
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