GE Digital Energy L30, Инструкция по эксплуатации, Страница: 178 / 644

5-52 L30 Line Current Differential System GE Multilin
5.2 PRODUCT SETUP 5 SETTINGS
5
5.2.9 OSCILLOGRAPHY
a) MAIN MENU
PATH: SETTINGS

PRODUCT SETUP

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 may be captured
simultaneously.
The
NUMBER OF RECORDS
is selectable, but the number of cycles captured in a single record varies considerably based on
other factors such as sample rate and the number of operational modules. There is a fixed amount of data storage for oscil-
lography; the more data captured, the less the number of cycles captured per record. See the
ACTUAL VALUES

RECORDS

OSCILLOGRAPHY
menu to view the number of cycles captured per record. The following table provides sam-
ple configurations with corresponding cycles/record. The minimum number of oscillographic records is three.
A new record may automatically overwrite an older record if
TRIGGER MODE
is set to “Automatic Overwrite”.
Set the
TRIGGER POSITION
to a percentage of the total buffer size (for example, 10%, 50%, 75%, etc.). A trigger position of
25% consists of 25% pre- and 75% post-trigger data. The
TRIGGER SOURCE
is always captured in oscillography and may be
any FlexLogic parameter (element state, contact input, virtual output, etc.). The relay sampling rate is 64 samples per cycle.
The
AC INPUT WAVEFORMS
setting determines the sampling rate at which AC input signals (that is, current and voltage) are
stored. 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 will be CLEARED.

OSCILLOGRAPHY

NUMBER OF RECORDS:
15
Range: 1 to 64 in steps of 1
MESSAGE
TRIGGER MODE:
Automatic Overwrite
Range: Automatic Overwrite, Protected
MESSAGE
TRIGGER POSITION:
50%
Range: 0 to 100% in steps of 1
MESSAGE
TRIGGER SOURCE:
Off
Range: FlexLogic operand
MESSAGE
AC INPUT WAVEFORMS:
16 samples/cycle
Range: Off; 8, 16, 32, 64 samples/cycle
MESSAGE
 DIGITAL CHANNELS

MESSAGE

ANALOG CHANNELS

Table 5–2: OSCILLOGRAPHY CYCLES/RECORD EXAMPLE
RECORDS CT/VTS SAMPLE
RATE
DIGITALS ANALOGS CYCLES/
RECORD
3 1 8 0 0 14663
3 1 16 16 0 6945
8 1 16 16 0 3472
8 1 16 16 4 2868
8 2 16 16 4 1691
8 2 16 63 16 1221
8 2 32 63 16 749
8 2 64 63 16 422
32 2 64 63 16 124
NOTE