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Nowadays voltage transients in electrical power systems can take different shapes related to properties of distortion source and physical phenomenon appearing in systems. Usually overvoltages contain oscillation components of different frequencies, which are propagating along lines reaching transformer terminals. Overvoltages impact power transformer insulation systems in spite of used overvoltage...
Rogowski coils (RCs) are usually used for high current measurements from low frequency up to high frequency of a current waveform. These precise and sensitive measurements are very susceptible to interference. A metallic shielding was often used as one of possible solutions. Influences and efficiency of RC shielding to measurement are investigated in the paper. Measurements were carried out for two...
Instrument Voltage Transformers (IVTs) introduce errors in power quality measure due to resonance's effects at high frequency. The accuracy of IVTs, definite by standards, is only about nominal frequency and does not consider high frequency response. The paper reports the IVTs experimental analysis on resonance's disturbances transferred to secondary side of Instrument Voltage Transformer. In particular...
Frequency characteristics measurement at the power transformers became a requirement imposed to the manufacturers in the specifications of the new products. There is a great interest dealing with the frequency characteristics from the viewpoint of the resonances that may appear between the transformer and the network where it is placed, as well as to detect the mechanical failures that may appear...
Many problems related to the voltage and current harmonics imposed in contemporary power systems are observed nowadays. The paper presents the voltage harmonic transfer capability of the voltage transformer usually used for the power quality measurement in the middle and high voltage grids. A simplified lumped parameters circuit model of the voltage transformer is proposed and verified by experimental...
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