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This paper describes a high accuracy laboratory PMU calibrator that is presently being developed at METAS. This reference grade calibrator enables traceable measurements of the dynamic performances of PMUs as outlined in the upcoming version of the standard IEEE C37.118 as well as the testing of the impact of power quality disturbances on PMU measurements. The calibrator is being developed in conjunction...
Current sensors have an important part in the technical world. A special part is by photovoltaic. The efficiency of the system can only increase by means of the MPP-Tracking with high precise current sensor. Furthermore, the inverter with the three phases should measure balance or unbalance effects. In this case, this paper will present a novel system (AC-DI module). This module has four high precise...
A post-synchronization method for a localization system is presented here. The synchronization of independent secondary radar units of an active localization system is essential. There are different synchronization techniques. One of these is FSK-pre-synchronization, which is analysed in this paper. The precision of the pre-synchronization is not accurate enough for round trip phase measurement. The...
The real-time on-line estimation of phasor frequency, amplitude and phase Angle makes a high request on both the accuracy and real-time of the method. In the conventional phasor measuring method based on DFT (discrete Fourier transform), data acquisition cycle was longer, the accuracy was easy to be effected by the frequency fluctuation. On the other hand, while the systems are under unbalanced operation...
A critical overview of the accuracy specifications of Phasor Measurement Units in the measurement of synchrophasors is presented in this work. The focus is both on the possible ambiguity arising from the definition of Total Vector Error (TVE), provided by the IEEE Standard C37.118-2005, and on the lack of homogeneity in the information provided by PMU manufacturers, that makes a very difficult task...
We develop a novel technique to obtain the constellation diagram from asynchronously sampled data measured by using the delay-detection technique, and demonstrate the constellation monitoring of 10.7-Gsymbol/s DQPSK and D8PSK signals and the BER estimation.
In the power fault recorder, power transformer is an important factor which influences the phase measurement accuracy. This paper focused on the modeling, simulation and analysis of voltage transformer. Considering the impact of sampling frequency, accurate measurements of absolute error were made in single input case, and those of relative error were made between voltage channels and current channels...
The phasors readings of the phasor measurement units (PMUs) are taken into consideration in state estimation analysis. The paper presents the effect of changing the locations and numbers of PMUs through the buses of the power network on the system state estimation results. A computer program is built and tested on 14- bus IEEE standard system. Also it is applied on a system depicted from the Egyptian...
The construction industry has been facing a paradigm shift to (i) increase; productivity, efficiency, infrastructure value, quality and sustainability, (ii) reduce; lifecycle costs, lead times and duplications, via effective collaboration and communication of stakeholders in construction projects. Digital construction is a political initiative to address low productivity in the sector. This seeks...
A circuit for on-chip measurement of long-term jitter, period jitter, and clock skew, is demonstrated. The circuit uses a single latch and a voltage-controlled delay element, and is evaluated in a stand-alone pad frame. Excellent reproduction of jitter measured by oscilloscope is shown. Measured jitter resolution is 1 ps or better. The circuit is also incorporated into a 2 GHz clock distribution network...
A novel 50% duty-cycle corrector (DCC) of digital signal processing (DSP) systems, designed with a purely digital phase-blending technique, is presented in this paper. The novel features of the proposed DCC includes a higher reliability against process, voltage and temperature variation due to the use of the synchronous mirror delay (SMD) technique, no-skew output clock, and a much faster duty-cycle...
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