Oscillography - GE D30 Instruction Manual

5.2 PRODUCT SETUP
the system exhibits too much variability, this approach is questionable and the fault location results for single-line-to-ground
faults shall be trusted with accordingly. It should be kept in mind that grounding points in vicinity of the installation impact
the system zero-sequence impedance (grounded loads, reactors, zig-zag transformers, shunt capacitor banks, etc.).
a) MAIN MENU

PATH: SETTINGS PRODUCT SETUP
 OSCILLOGRAPHY

5
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 cap-
tured 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 oscil-
lography; the more data captured, the less the number of cycles captured per record. See the

RECORDS

OSCILLOGRAPHY

ple configurations with corresponding cycles/record.
Table 5–2: OSCILLOGRAPHY CYCLES/RECORD EXAMPLE
RECORDS CT/VTS
1 1
1 1
8 1
8 1
8 2
8 2
8 2
8 2
32 2
A new record may automatically overwrite an older record if
Set the
TRIGGER POSITION
25% consists of 25% pre- and 75% post-trigger data. The
any FlexLogic™ parameter (element state, contact input, virtual output, etc.). The relay sampling rate is 64 samples per
cycle.
5-40

OSCILLOGRAPHY
NUMBER OF RECORDS:
TRIGGER MODE:
MESSAGE
Automatic Overwrite
TRIGGER POSITION:
MESSAGE
50%
TRIGGER SOURCE:
MESSAGE
Off
AC INPUT WAVEFORMS:
MESSAGE
16 samples/cycle
 DIGITAL CHANNELS
MESSAGE

 ANALOG CHANNELS
MESSAGE

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 sam-
SAMPLE DIGITALS
RATE
8 0
16 16
16 16
16 16
16 16
16 63
32 63
64 63
64 63
to a percentage of the total buffer size (for example, 10%, 50%, 75%, etc.). A trigger position of
D30 Line Distance Protection System
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
ANALOGS CYCLES/
RECORD
0 1872.0
0 1685.0
0 276.0
4 219.5
4 93.5
16 93.5
16 57.6
16 32.3
16 9.5
is set to "Automatic Overwrite".
TRIGGER MODE
is always captured in oscillography and may be
TRIGGER SOURCE
5 SETTINGS
5.2.8 OSCILLOGRAPHY

ACTUAL VALUES
GE Multilin