Basic description of the Transformer Monitor
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The basic version has only one current input to determine the hot-spot temperature. Three
currents can also be measured through an optional Aron circuit (hardware Characteristic
M2).
In most cases, this configuration will produce acceptable results because one can assume
that the transformer has a more or less balanced load.
For this general operating condition:
The hot-spot temperature is calculated and the cooling equipment controlled according to
the model shown in Figure 3.
The operating current and the oil temperature are the most important measurements for
the estimation and calculation of the hot spot and the hot-spot temperature Θ
h
. The values
of the measured oil temperature together with the current and characteristic values of the
transformer are put into the equation to obtain a thermal image of the transformer. This
enables the service life consumption of the insulation and the hot-spot temperatures to be
calculated.
The transformer's temperature can be controlled by connecting fans in six stages, two oil
pumps and a heater. The fans are controlled automatically based on the oil-, winding or
predicted winding temperature. The outputs used to control the fans and the inputs used
to feed the temperature signals into the controller can be set up at a later stage in the
menu-driven configuration.
A default configuration is supplied that may occasionally require a few minor changes.
If additional analogue inputs or outputs and/or additional binary inputs or outputs are re-
quired for the Monitoring system, interface modules (ANA-D and BIN-D) can be connected
through the device's COM 3 port. This increases the hardware resources of the basic unit.
If the information provided by the system is used properly, the function can significantly in-
crease the transformer's availability using comparatively few resources.
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