AIM To describe our experience with shock testing for the evaluation of patients with Riata™ leads. METHODS Among 51 patients with normal baseline electrical parameters, 20 died during follow-up. Of the remaining 31 patients, 15 underwent the test: In 10 cases a defibrillation testing with ventricular fibrillation (VF) induction and in 5 cases a R-wave-synchronized shock (> 20 J, without indu...

The digitalization of a medium voltage network requires huge efforts from distributed system operators and electric utilities. main reason is attributed to the costs associated with replacement or introduction new intelligent electronic devices capable collecting digitalizing current measurements. To this purpose, paper introduces idea stand-alone merging unit (SAMU), which features real-time h...

A new concept, called synchronized Lissajous curve, is proposed to study synchro-waveform measurements that are obtained from waveform measurement units (WMUs) in power distribution systems. Two types of curves discussed. The first one created by plotting the difference two voltage waveforms versus current waveforms. second derivatives These carry valuable and complementary information about st...

measurement of magnitude and frequency of the voltage flicker is very important for monitoring andcontrolling voltage flicker efficiently to improve the network power quality. this paper presents twonew methods for measurement of flicker signal parameters using shuffled frog leaping algorithm(sfla) and imperialist competitive algorithm (ica). this paper estimates fundamental voltage andflicker ...

N O V E M B E R / D E C E M B E R 2 0 1 4 www.insidegnss.com Efficient power transmission and distribution would benefit from synchronized near–real-time measurements of voltage and current phasors at widely dispersed locations in an electric power grid. Such measurements also could enable effective realtime system monitoring and control, which are considered to be the key to preventing wide-sc...

State estimation is an important tool for power system supervision and control and the related applications. Based on the redundant measurements taken in the network, state estimation provides the most likely state of the power system. Conventional measurements were collected by the SCADA system and the measurement chain did not allow measurement synchronization. A disadvantage is that due to t...

Measurements of the intrinsic emittance and response time of a Cs3Sb photocathode are presented. The emittance is obtained with a solenoid scan technique using a high voltage dc photoemission gun. Photoemission response time is evaluated using a RF deflecting cavity synchronized to a picosecond laser pulse train. We find that Cs3Sb has both small mean transverse energy, 1606 10 meV at 532 nm la...

For power networks such as the Nordic Grid, that have operation constraints limits imposed by the existence of low-damped electromechanical oscillations, the estimation of electromechanical mode properties is of crucial importance for providing power system control room operators with adequate indicators of the stress of their network. This article addresses the practical application of differe...

This article describes two methods and circuits for generation of a signal synchronized to the Coordinated Universal Time (UTC) time scale. The is used as sampling clock synchrophasor Sampled Values generation. Both use PPS (Pulse Per Second) pulse synchronization signal. In first method, procedure implemented entirely in Field Programmable Gate Array (FPGA) device. second method uses microcont...