Waveform Capture (Trace Memory) - GE 750 Instruction Manual

750/760
Feeder Management Relay
Waveform Capture
(Trace Memory)
4–26
The EnerVista 750/760 Setup software can be used to capture waveforms (or view
trace memory) from the 750/760 relay at the instance of a trip. A maximum of 512
cycles can be captured and the trigger point can be adjusted to anywhere within the
set cycles. A maximum of 16 waveforms can be buffered (stored) with the buffer/
cycle trade-off.
The following waveforms can be captured:
• Phase A, B, and C currents (I
• Ground and Sensitive ground currents (I
• Phase A-N, B-N, and C-N voltages (V
• Digital data for output relays and contact input states.
1. With EnerVista 750/760 Setup running and communications established, select
the Actual > Waveform Capture menu item to open the waveform capture
setup window:
Files to be saved or viewed
Click on Trigger Waveform to trigger a waveform capture.
The waveform file numbering starts with the number zero in the 750/760;
therefore, the maximum trigger number will always be one less then the total
number triggers available.
2. Click on the Save to File button to save the selected waveform to the local PC.
A new window will appear requesting for file name and path.
The file is saved as a COMTRADE File, with the extension 'CFG'. In addition to
the COMTRADE file, two other files are saved. One is a CSV (comma delimited
values) file, which can be viewed and manipulated with compatible third-party
software. The other file is a DAT File, required by the COMTRADE file for proper
display of waveforms.
To view a previously saved COMTRADE File, click the Open button and select
the corresponding COMTRADE File.
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Advanced EnerVista 750/760 Setup Features
, I , and I )
a b c
and I )
g sg
, V , and V )
a b c
Number of available files
Save waveform to a file
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