GE t60 Instruction Manual page 97

Ur series transformer management relay
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5 SETTINGS
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. A list of all possible analog metering actual value parameters is presented in Appendix A:
FlexAnalog Parameters. The parameter index number shown in any of the tables is used to expedite the selection 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 desig-
nates 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.
The source harmonic indices appear as oscillography analog channels numbered from 0 to 23. These correspond
directly to the to the 2nd to 25th harmonics in the relay as follows:
NOTE
Analog channel 0 ↔ 2nd Harmonic
Analog channel 1 ↔ 3rd Harmonic
...
Analog channel 23 ↔ 25th Harmonic
When the
NUMBER OF RECORDS
WARNING
GE Multilin
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.
T60 Transformer Management Relay
# ANALOGS
CYCLES/
RECORD
0
2049.0
0
922.0
0
276.0
4
263.0
4
93.5
16
93.5
16
57.6
16
32.3
16
9.5
is set to "Automatic Overwrite".
5.2 PRODUCT SETUP
5
5-19

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