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A concept of an integrated transformer test van is introduced in the paper. Several routine electric test techniques (insulation testing, winding resistance, ratio and vector group testing) and advanced diagnostic methods (DFR, SFRA) are at the core of the system. A central control and reporting computer and test leads that are shared among different instruments help to facilitate the workflow. Limited...
This paper mainly introduces a digital detecting system of the dielectric loss in the capacitive equipment based on virtual instruments. This system can real-time collect, analyze, process and storage electrical signals with National Instruments' program LabVIEW and ADLINK's DAQ board. Through the simulation test in lab and the real test in electric substation, it is shown that this system has high...
Several methods have been proposed for the measurement of the magnetic losses in electrical steel sheet in a rotating magnetic flux. The method considered here is based on determination of the field quantities and makes use of square specimens and an air gap between the pole faces and the specimen. We earlier reported the results of magnetic field analysis on this apparatus by the finite element method...
The present method employs the very commonplace phenomenon of timing a parallel combination of inductance and capacitance to resonance. In Fig. 1 a constant voltage E is applied to the L C tuning circuit and C is varied until the current I is a minimum. This residual current is a measure of the total loss of the tank circuit. This loss may be indicated by a figure in mhos conductance, that is the...
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