943 research outputs found
Identification and Correction of Artifact in the Measurement of Pulsed Magnetic Fields
No full textAC magnetic flux density meters usually integrate
a high pass filter with a very low cut-off frequency (1 Hz
- 30 Hz) aiming at reducing the effect of slow oscillations.
This can distort the actual time domain behaviour of induction
waveforms detectable close to industrial or medical devices, even
causing artefact high amplitude oscillations. This paper proposes
a procedure to identify the filter parameters that accurately
reproduce its measured frequency behaviour and suggests an
algorithm to correct, in time domain, the field meter recorded
waveform
Characterization of magnetic field measuring instruments in presence of non-sinusoidal magnetic fields
No full text
Set up and characterization of a measuring system for PQ measurements in a MV site with PV generation
No full textEvaluation of Frequency Behavior of Coils for Reference Magnetic Field Generation
No full text—The frequency behavior of coils for the generation of
reference time-varying magnetic fields is evaluated starting from
the coil construction parameters (geometrical dimensions, number
of turns). A coil equivalent circuit with lumped parameters is con-
sidered and the related equation system is solved in the frequency
domain. The computed frequency behavior of the coil impedance
is validated by comparison with experimental data. The operating
frequency limit is identified fromthe analysis of the coil impedance
variation with frequency as a function of the construction param-
eters
Experimental evaluation of earth currents generated by a DC traction network
No full textEarth currents generated by a DC traction
network, causing interference with the functioning of
sensitive apparatuses and plants located in the
surrounding area, are experimentally investigated.
Measurements of the potential variation of a lighting
plant earthing network are made at the same time with
significant railway load variations. The presence and
the amount of earth current with respect to that flowing
in the overhead line are experimentally evaluated
through measurements of voltage drops across rail
sections, when a defined current is imposed on the
supply line for a short time
Analysis of electric contact behaviour under different operating conditions by a finite difference model
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