In the measurement of dc current for the range of 10-6-10-‘2 A, a stable electrometer is required. The electrometer circuit is usually implemented by simply probing the voltage drop on a load resistor using a sensitive voltage amplifier.’ In this scheme, different values of the load resistor are needed to cover multi decade range without saturating the voltage amplifier. This results in differe...

In the perspective of a capillary power system monitoring, measurement transducers must have larger and larger bandwidth and accuracy, due to proliferation on power grids of new power quality phenomena. Various types of voltage transducers, based on different operation principles, have been realized; in particular, those based on voltage dividers and optical insulation with digital communicatio...

Power system state estimation is a process to find the bus voltage magnitudes and phase angles at every bus based on a given measurement set. The state estimation convergency is related to the sufficiency of the measurement set. Observability analysis actually tests this kind of problem and guarantees the state estimation accuracy. A new and useful algorithm is proposed and applied in this pape...

Richardson MJ, Silberberg G. Measurement and analysis of postsynaptic potentials using a novel voltage-deconvolution method. J Neurophysiol 99: 1020–1031, 2008. First published November 28, 2007; doi:10.1152/jn.00942.2007. Accurate measurement of postsynaptic potential amplitudes is a central requirement for the quantification of synaptic strength, dynamics of short-term and long-term plasticit...

The new phase-II N-glucoside metabolites of butobarbitone and pentobarbitone are identified and quantified in human urine after single doses of these drugs. The identification and quantification of these metabolites were carried out by mass spectroscopy technique (accurate mass measurement and high voltage scanning). It was found that the butobarbitone N-glucoside comprised 26% of the dos...

Split-winding transformer is a one of the common types with low-voltage winding placed above other and jointly high-voltage regulation winding. The paper investigates circulating currents that occur in windings case nonsymmetric load. In addition, measurement for 240MVA, 220 kV presented along numerical calculation compared measurement.

Isolated networks are common practice for operating high voltage networks up to a small earth fault current defined by standards. The reason for choosing this type of network are the saving of the arc suppressing coils by coexistence of a self-healing grid in case of an earth fault. During the starting up of a 110-kV-isolated network long-time measurement were installed. During these measuremen...

The report describes the methods used and results of a characterization of the voltage non-linearity of a 1200 kV HVDC divider at Aalto University high voltage laboratory. Measurements were performed in April 2012 and June 2013. Historical data from 1990 and 2007 were combined with new measurement results to gain good understanding of the voltage dependence and its reasons. The new more precise...

This paper proposes a novel online measurement-based Wide-Area Voltage Control (WAVC) method using Phasor Measurement Unit (PMU) data in power systems with Flexible AC Transmission System (FACTS) devices. As opposed to previous WAVC methods, the proposed does not require any model knowledge or participation of all buses and considers both active reactive perturbations. Specifically, exploits re...

Microturbine generation system is one of the most promising and a fast growing distributed generation sources. It is used in various applications thanks to high efficiency, quick start and high reliability. Combination of the microturbine and storage system (e.g. battery bank) is desirable selection to satisfy the load requirements under all conditions and hence the battery bank can play an imp...