Tx-Multiscan
Tx-Multiscan: Product Description
Transformer Equilibrium Check & Data Evaluation
For proper data evaluation, the equilibrium operating environment of the transformer must meet the necessary criteria. In practice, this means the following :
• time variation of the mean temperature of the transformer
and
• time variation of the water content in the oil must be simultaneously lower then predefined limits
The Tx-MultiScan software solves the problem in the following steps:
the program is started by clicking on the MultiScan.exe icon at the Main window of the
lap-top and we get the
main Tx-Multiscan
window.
By click on the
Measuring button are
data transferred into the
lap-top and visualized in
the form of the Data
Table.
Advanced Evaluation
The Nielsen chart then enables in the Diagnosis section :
- quantitative evaluation of the average water content in hard insulants of the transformer ( Qp = 2.9% in this case) based on the SU-reading of:
- water content in oil 4
- upper and bottom temperature of the transformer
- equilibrium conditions
- the first determination of operation conditions is focused on evaluation of the maximum allowed temperature level of this transformer where the water content in oil doesn´t exceed allowed limit transformer (49.8 deg C).
In the next diagnostic step, started by the click on TLC-button, the next very important relation between the theoretical dielectric strength of oil (Ud-value) and the averaged temperature of this specific transformer is established.
This step is extremely important especially for the determination of IEC-requested operation conditions of the transformer (the Ud-value has to be, under operation condition, always higher than IEC-given limit).
In contrast to standard diagnostic which gives us only single Ud-value at a sampling temperature and nothing else, the TLC-relation (Temperature Loading Curve) gives us substantially better insight because describes the change of the Ud-value of oil within the whole temperature range of the given transformer .
Only this specific approach effectively inhibits misleading diagnostic results where the same :
- "cold" transformer is often regarded as troublefree ( water content in oil is low (its relative humidity is low) and its Ud-value is therefore high)
- "hot" transformer is often regarded as unsuitable ( water content in oil is high ( its relative humidity is high) and its Ud-value is e.g. lower than allows the norm).
The Tx-Multiscan not only show us the TLC-relation of a given transformer but enables us, by entering of demanded dielectric strenght and demanded Tx-temperature, to quantify the amount of water which has to be removed to meet this target.
For more details See please Tx-Multiscan Manual