DSQC327A ABB distributed control system industrial DCS module card

Description

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Winding temperature
The beating heart of a power transformer is its
windings, but traditional methods for controlling
transformer cooling are based on monitoring
the oil temperature rather than what is actually
happening at the transformer’s hotspot. The aging
of the insulation at the hottest point in the winding
typically determines the life span of a power
transformer; an oil temperature just 8°C above
nominal could reduce the insulation life by up to 50
percent [3] →6.
The AAPT’s modern Electronic Temperature
Monitoring solution can accurately calculate the
transformer’s hotspot based on design data and
factory type-test results, together with dynamic
variables such as the loading and oil temperature.
This can then be used to regulate the transformer’s
hotspot temperature.
CoreTecTM 4
The brain of the AAPT is the CoreTec 4 module.
CoreTec 4 is a digital hub, responsible for collecting
and analyzing readings from the different sensors,
and processing them to provide an assessment
of transformer operation (including cooling
equipment governance, if needed) and life
expectancy.
For the development of CoreTec 4, ABB was able
to leverage existing expertise and experience in
transformer monitoring systems, building on
developments that go back to the 1980s with first
fiber-optic temperature monitoring systems, the
2000s with Transformer Electronic Control (TEC)
and the previous CoreTec generations.
Apart from functionality, additional design
requirements such as compactness, expandability
(by plug-ins), ease of installation and durability
were considered in the development process.
To ensure system robustness, demanding
mechanical, thermal and dielectric laboratory trials
were carried out. Mechanical testing covered not
only vibration but also thorough seismic and shock
tests (over 10 G). Thermal validation was achieved
in steady-state conditions and in contingency
situations, such as when cabinet cooling is lost.
All these validation tests had positive results – the
readings were consistent during the tests with
no interruption, no visual damage and successful
operation after the tests.