GE Industrial Solutions Entellisys 4.0 System User Manual - Manual (Page 145)

High Current Trigger relay 145
9
Display axis names
•
Check box hides/displays the Y-axis parameter names.
Auto-detect / auto-display
•
Check box automatically displays preset, digital channel outputs if a change of state
occurred during triggering.
Change background color
•
Change the background color of the graphs. The default is light blue. Changing this option
effects the background of waveform capture display.
9.2.4 Grouping waveform signals
The ability to group waveform signals together in order to view them with respect to a common
scale is available. Phase waveform magnitudes that are grouped within the same group
heading are displayed in relation to each of the other signals in their group. The waveform with
the largest amplitude is taken as the reference scale, and other waveforms are displayed in their
proper ratios with respect to this signal.
9.3 High Current Trigger relay
The High Current Trigger relay is included in the Waveform Capture option and is designed to
automatically trigger a waveform capture in the event of a sudden change in the steady state
load.
By setting current thresholds as low as 10% of the breaker rating, Entellisys can capture
waveforms of every phase from all circuit breakers in the system on a wide variety of normal
events. This is useful to characterize system dynamics such as a motor starting or to diagnose
and improve power system dynamics.
Operation
Once current is above a relative pickup level for the specified duration, the relay will alarm and
trigger waveform capture. Waveforms are captured per the settings in “Waveforms” tab of
“Metering & Waveforms” screen
(See section 9.2.1) .
If waveform capture option is not enabled or the maximum number of waveforms has been
reached, the High Current Trigger Relay will no longer record waveforms but still log alarm
events.
NOTE: If the High Current Trigger relay operates (in the same half cycle) at more than one
breaker, each generates an event but only one waveform is captured.
Events
This relay logs the following events:
“Alarm Pickup High Current Trigger” - logged when current at the breaker goes above the
pickup level