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GE UR Series Instruction Manual Page 101

Line differential relay.
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5 SETTINGS
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
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 CT/VT 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
ÖØ
RECORDS
OSCILLOGRAPHY
ple configurations with corresponding cycles/record.
Table 5–1: 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
The
is programmable as a percent of the total buffer size (e.g. 10%, 50%, 75%, etc.). A trigger position
TRIGGER POSITION
of 25% consists of 25% pre- and 75% post-trigger data.
The
is always captured in oscillography and may be any FlexLogic™ parameter (element state, contact
TRIGGER SOURCE
input, virtual output, etc.). The relay sampling rate is 64 samples per cycle.
The
setting determines the sampling rate at which AC input signals (i.e. current and voltage) are
AC INPUT WAVEFORMS
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, i.e. it has no effect on the fundamental calculations of the device.
An
setting selects the metering actual value recorded in an oscillography trace. The length of each oscil-
ANALOG CHANNEL
lography trace depends in part on the number of parameters selected here. Parameters set to 'Off' are ignored. The param-
eters available in a given relay are dependent on: (a) the type of relay, (b) the type and number of CT/VT hardware modules
installed, and (c) the type and number of Analog Input hardware modules installed. Upon startup, the relay will automati-
cally prepare the parameter list. Tables of all possible analog metering actual value parameters are presented in Appendix
A: FLEXANALOG PARAMETERS. The parameter index number shown in any of the tables is used to expedite the selec-
tion of the parameter on the relay display. It can be quite time-consuming to scan through the list of parameters via the relay
keypad/display - entering this number via the relay keypad will cause the corresponding parameter to be displayed.
All eight CT/VT module channels are stored in the oscillography file. The CT/VT module channels are named as follows:
< slot_letter >< terminal_number >—< I or V >< phase A , B , or C , or 4th input >
The fourth current input in a bank is called IG, and the fourth voltage input in a bank is called VX. For example, F2-IB des-
ignates the IB signal on terminal 2 of the CT/VT module in slot F. If there are no CT/VT modules and Analog Input modules,
no analog traces will appear in the file; only the digital traces will appear.
When the
NUMBER OF RECORDS
WARNING
GE Power Management
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
64
32
64
64
64
64
64
TRIGGER MODE
setting is altered, all oscillography records will be CLEARED.
L90 Line Differential Relay
# ANALOGS
CYCLES/
RECORD
0
1872.0
0
1685.0
0
266.0
4
219.5
4
93.5
16
93.5
16
57.6
16
32.3
16
9.5
is set to "Automatic Overwrite".
5.2 PRODUCT SETUP
ÖØ
ACTUAL VALUES
5
5-17

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