Setting Liquid Pickup And Drop Out Temperatures - Advanced Power technologies TTC-1000 Instruction & Operation Manual

2. SP21, SP22, SP23, and SP24 drop out and pick up are settable in single
probe models, but do not have any function.
3. Similarly SP31, SP32, SP33, and SP34 do not have any function in dual
probe units.
4. WSP1, WSP2, WSP3, WSP4 drop out and pick up are settable in models
without the calculated winding feature, but do not have any function.

4.6.1 Setting Liquid Pickup and Drop Out Temperatures

These settings are used to start a stage of cooling or indicate a high temperature
alarm for probe 1, 2 or 3 liquid temperatures.
Since there are various configurations for the device, the use of the probe
outputs will depend on the features available and those used. The selection of
probe names will determine the way the programming uses the probe
information.
If one or more CT inputs have been included, winding temperature of a winding
can be determined by the CT current in that winding and the top oil temperature.
If only one winding temperature is desired, the remaining probes can be used for
other tasks. If the CT option was not purchased, one probe will be needed to be
used in the transformer's heated well if there is a need to measure winding
temperature.
If the transformer has an LTC, use settings for LTC if only the reading is desired
or, if using for LTC protection, use settings for LTCDIFF1, or LTCDIFF2, or both
if there are two tap changers. When a probe is designated as LTC, LTCDIFF1, or
LTCDIFF2, it is not available for other uses. The reported temperature from that
probe will vary between –20°C and +20°C depending on the relation of top oil
and tap changer temperatures as this is the arithmetic difference between them
limited to an overall 40°C range.
NOTE: If a probe is designated as LTC and not LTCDIFF1 or LTCDIFF2, it
will not be used as an input to the LTCDIFF and LTC Rate-of-Rise
protection calculations.
Any probe can be used for any function as long as the probe name is correctly
set per the table in 4.4 above.
Assuming Probe1 is being used for temperature measurement the points are
programmed as follows. From the front panel, press the
the setting 001 is displayed:
PRGM SETTING 001
S P 1 1 P I C K U P = 6 0  C
44
 
or arrow buttons until
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