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EATON ELECTRICAL
38
Predictive Diagnostics
Auxiliary
Parameters to
Suspend
Measurements
or Humidity readings to suspend measurements, if any
of them are out of pre-set boundaries. The main
application of this feature is to suspend measurement, if
equipment is out of service. Current is the best
parameter to do so. Activate current for continuous
check and set its boundaries. It is sufficient to set the
current % lower boundary at 10–20%. It will suspend
measurement, if it is below this value.
The procedure on right describes set of Temperature
channel. It is similar for two other auxiliary channels.
Press
Enter
.
InPt-On/OFF
will appear. Use
keys to set the object
temperature parameter check ON or OFF.
Press
Enter
. If ON is selected,
tLO- 0050
appears. Use
keys
to set LOW temperature limit (deg C).
Press
Enter
.
tHI- 1000
will appear. Use
keys to set HIGH
temperature limit.
When done, press
Enter
.
Number of
Cycles of
Power
Frequency for
Measurement
Represents a time of a single measurement.
60 cycle is optimal. You may set it higher, if better
statistics is needed. Setting better statistics will
proportionally increase a measurement time.
Measurement time estimate in seconds is as follows:
number of active channels * 21 magnitude windows *
selected number of cycles / power frequency. As an
example with 15 channels and 60 cycles =
15*21*60/60=315sec~5 minutes.
Scroll setup parameters until
SinCount
appears.
Press
Enter
.
Cnt-060
will appear.
Use
keys to set the number of power cycles (of 60 or 50 Hz) for the
measurement.
When done, press
Enter
.
Set 4–20
mAmps Output
Commonly PDI is the best parameter to represent the
overall PD activity. In some cases, Maximum Pulse
magnitude can be set for output.
Remember: enabling
one of the parameters to 4-20mAmps output, enables
the same parameter for Alarm and Display!
Scroll setup parameters until
Out tYPE
appears.
Press
Enter
.
Out-PdI(Q02)
will appear.
Use
keys to set the required parameter to output.
PdI
– Partial discharge intensity in % of “Red” threshold, or
Q02
– Pulse magnitude in % of “Red” threshold.
When done, press
Enter
.
Detection of
Phase Shift
The procedure that is described in this section
assumes that the device is configured for internal
synchronization and its auxiliary inputs are load
current and humidity. This is most common option.
If the configuration is different from this, please
refer to Appendix 2 for additional information.
Note: Automatic phase shift detection is incorrect, if
any of following has been observed:
1. IG displayed dashes for several times in the
versions 2.00 and higher (bad phase reference signal)
Scroll setup parameters until
PhShiFt
appears. Press
Enter
Then you have a choice of manual (if phase shift known from another
source) or automatic set of phase shift.
For manual setting
press
Enter
and
PhSh-000
will appear. Use
keys to set the
relative phase shift from 0 to 360 (deg)
.
Press
Enter
to Save new value,
or
Esc
to exit without saving.
Connections for automatic detection of phase shift in Pre-Revision 1:
•
Humidity sensor wires (or jumper wire between terminals 10 and 12