The main reasons for installation of power quality meters in distribution transformer substations are monitoring and global evolution electrical network towards the 'smart grid'. In case that all measurements from properly synchronised centralised, new possibilities control or evaluation enabled. This contribution proposes possibility an earth fault localisation with aid data recorded on low-voltage side medium voltage/low voltage transformers compensated neutral networks which equipped...

The evolution of phasor measurement units (PMUs) marked a significant development in the field electrical engineering. integration PMU-based linear state estimators or augmentation SCADA measurements with PMU has emerged as promising solution to address limitations conventional estimation. utilization been demonstrated effectively errors, leading precise determination system’s within single iteration. This article provides comprehensive discussion both and nonlinear estimation computational...

The paper describes a unified methodology which takes into account the advantages and disadvantages of different Power Line Communication (PLC) technologies suitable for Smart Metering deployment. should provide detailed evaluation PLC based on clear definition parameters their measurement. Based this methodology, we be able to comparison selected also data design telecommunication infrastructure Metering/Smart Grids. In present performance tests carried out in laboratory environment low...

The aim of the paper is to describe procedures for systematical determination immunity lamps supply voltage variations caused by interharmonics. curve lamp presented as an interharmonic magnitude versus frequency and called interharmonic-flicker curve. curves are determined utilizing a modified concept measurement gain factor in domain published limits on flicker. Another described method establishing based measuring luminous flux flicker which defined well. Further complex measured data...

In general, the power quality analysis is a very complex issue and it requires long-term measurement in real distribution networks. Moreover, voltage has to be within specific tolerance for low-voltage network. this paper of network after connection small photovoltaic plant evaluated. Therefore, influence on changes voltage, flicker total harmonic distortion by connected under different operating states described paper. The main task article present results measurements carried out

This paper presents the concept of impact harmonic distortion on a digital protection relay. The aim is to verify and determine reasons mal-trip or failure trip relays; suggested solution explained by mathematical model in Matlab Simulink programming environment. relays have been tested under distortions order function algorithm abnormal conditions. comparison between relay conditions environment based injected harmonics high values provided. test separated into different levels; first level...

The paper deals with frequency stability simulations. It presents twenty areas equivalent dynamic model of the Continental Europe synchronous area. is suitable to simulate different system splitting scenarios and assess behaviour power system. network simulator MODES used as a simulation tool.

The distance protection relay measures the line voltage and current at location evaluates ratio between these quantities. Distance relays are widely used on transmission, even distribution systems. Current transformers (CT) very important part of power system protection. main purpose a CT is to transform primary in high single level that can be handled by delicate electronic device. This paper deals with influence saturation digital relay. Saturation evaluated for fault close location.

The compensated networks are affected by the phase capacity asymmetry of wiring, which causes unbalancing voltages in tuned condition arc-suppression coil. In especially unfavourable cases this effect reduces possibility network operation with coil out tune is accompanied higher values fault currents during ground faults and natural frequency course recovery voltage after switching off or interrupting fault. These disadvantages can only be removed efficient elimination asymmetry. new methods...

As an important driver element, the pneumatic artificial muscle (PAM) is widely used in industrial applications for many automation purposes thanks to their variety of advantages. The design a stable robust position controller PAM difficult since it very nonlinear time-variant controlled plant because compressibility air, air mass flow rate through valve, etc. main contribution this paper control method based on sliding mode robot arm, driven by actuator. Finally, presents experimental results.

This paper analyses the influence of current harmonics on protections devices connected to power system which can cause serious problems. outlines work that has been conducted test overcurrent relay and identify impacts distribution utility protection control systems. The REJ 525 is based a microprocessor environment. A self-supervision continuously monitors operation relay.

The paper deals with the description and analysis of method additional earthing affected phase used for elimination fault current during an earth in a compensated network. efficiency this is strongly influenced by location resistance and, some cases, its application can lead to deteriorating situation at point thus increasing risk dangerous touch voltage. analyses results simulations selected cases where negative influence on magnitude (and therefore occurrence voltage neighboring LV...

IEC 61850 is the standard for communication substation which determines new applications of protection based on peer-to-peer communications between multifunctional devices (IEDs). The GOOSE messages (Generic Object Oriented Substation Event) can be used to replace hard wired control signals exchanged IEDs interlocking and purposes. idea that implementation high-speed should equal or better than what achievable by existing technology. paper focus using relays possibility modeling this...

Todays power systems are becoming more and complex due to the continuous increase in energy demand high proliferation of intermittent renewable resources. Therefore, system's control monitoring became very challenging. The usage highly responsive phasor measurement units (PMUs) is one solutions that making possible real-time electric systems. available PMU block matlab/Simulink library designed provide only magnitude, phase angle, frequency positive-sequence component a three-phase signal....

State estimation in power system is an iterative solution problem nature due to the nonlinear relation between measurements and state variables. Consequently, estimated results will be approximated. The advancement phasor measurement technology brings new opportunities improve performance by eliminating nonlinearity issues. In this paper, a measurement-based linear estimator for IEEE 14 bus presented it has been examined different possible errors according Monte Carlo theory. test was...

The paper is focused on the operational experience with an automatic system for suppression of a fault current during ground by additional earthing faulted phase in supply substation. Such was experimentally installed Brno-Medlánky 110/22 kV To verify benefits as well to assess its possible failings, twenty-four experimental measurements based theoretical study were performed. During those experiments, low-resistance and arc faults monitored urban suburban part compensated network capacitive...

This paper deals with intermodal transportation of goods from Europe to the United States. The main objective is development a mathematical model called Transatlantic multi-mode container routing problem. It provides tool for network optimization in science. developed enables users determine optimal collaborative system that achieves minimization costs company ships single commodity multiple origins destinations. consists maritime shipping lines between ports and then networks road railway...

The paper is focused on the short voltage dips and interruptions in public supply networks their influence connected computer power sources. There performed a comparison of immunity classification by standard EN 61000-4-11 against proposed classification, which based disturbing influences real networks. are mentioned specifications essential phenomena, have final limiting curve immunity. Limiting curves some types electric equipments measured pointed.

The compensated networks are affected by the phase capacity asymmetry of wiring, which causes unbalancing voltages in tuned condition arc-suppression coil. In especially unfavourable cases this effect reduces possibility network operation with coil out tune is accompanied higher values fault currents during ground faults and natural frequency course recovery voltage after switching off or interrupting fault. These disadvantages can only be removed efficient elimination asymmetry. new methods...