GE D30 Instruction Manual page 221
Line distance protection system
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CHAPTER 5: SETTINGS
Table 5-11: Oscillography cycles/record example
Records
CT/VTs
3
1
3
1
8
1
8
1
8
2
8
2
8
2
8
2
32
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.
When changes are made to the oscillography settings, all existing oscillography records are cleared.
NOTE
5.3.8.2 Digital channels
SETTINGS PRODUCT SETUP OSCILLOGRAPHY DIGITAL CHANNELS
DIGITAL CHANNELS
— This setting selects the FlexLogic operand state recorded in an oscillography trace. The length of
DIGITAL 1(63) CHANNEL
each oscillography trace depends in part on the number of parameters selected here. Parameters set to "Off" are ignored.
5.3.8.3 Analog channels
SETTINGS PRODUCT SETUP OSCILLOGRAPHY ANALOG CHANNELS
ANALOG CHANNELS
These settings select the metering actual value recorded in an oscillography trace. The length of each oscillography trace
depends in part on the number of parameters selected here. Parameters set to "Off" are ignored. The parameters available
in a given relay depend on
•
the type of relay,
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Sample rate
Digital
8
0
16
16
16
16
16
16
16
16
16
63
32
63
64
63
64
63
DIGITAL CHANNEL 1:
Off
DIGITAL CHANNEL 63:
Off
ANALOG CHANNEL 1:
Off
ANALOG CHANNEL 16:
Off
Analog
Cycles/
record
0
14663
0
6945
0
3472
4
2868
4
1691
16
1221
16
749
16
422
16
124
TRIGGER MODE
Range: FlexLogic operand
Range: FlexLogic operand
Range: Off, any FlexAnalog parameter
See Appendix A for list
Range: Off, any FlexAnalog parameter
See Appendix A for list
PRODUCT SETUP
is set to "Automatic
5-89
5
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