Shan Lin, Christian Rothleitner, Norbert Rogge
The Planck-Balance (PB) is a table-top version of a Kibble balance. In contrast to many existing Kibble balances, the coil is moved sinusoidally and an ac rather than a dc signal is generated in the dynamic mode. The three-parameter sine fitting algorithm is applied to estimate the amplitudes of the induced voltage and the coil motion, which are used to determine the force factor Bl of the voice coil of the electromagnetic force compensation balance. However, the three-parameter sine fitting algorithm is not robust against some perturbations, e.g. additive Gaussian white noise, quantization...
Na Liu, Shengyou Gao, Caijun Yang, Lu Huang
The characteristics of a portable charge standard for calibrating partial discharge(PD) measurement equipments are discussed and investigated in this paper. A portable PD calibrator and measuring system was set up by NIM, China. This calibrator and two typical commercial ones are measured by NIM’s digital system. The discharge impulses and the charge generated by the three calibrators are recorded and compared. The comparison results show that the portable PD calibrator is of good characteristic both in the range of charge and in the shape of its impulses and also in that of the repeatability.
Pavol Dolinsky, Imrich Andras, Linus Michaeli, Jan Saliga
A new mathematical model for generating ECG signal is presented in this paper. The generation is based on geometrical properties of real ECG signals instead of various artificial function used in commonly applicated models. Variation of parameters allows arbitrary setting of particular waves of PQRST complex. This way arbitrary PQRST signals typical for various heart diseases can be modelled and generated with high fidelity. Moreover, parameter variation allows generate different waveform for each subsequent heartbeat without mixing PQRST waves order. The elementary trigonometric function...
Alessandro Mingotti, Abbas Ghaderi, Roberto Tinarelli, Lorenzo Peretto
This paper presents a mathematical study along with the first preliminary results to correlate the equivalent impedance of a medium voltage cable-joint to its Tangent Delta value (i.e. its Dissipation Factor value). The failures of cable joints are a broad and current topic which is being investigated inside the electric engineering community. In the paper the results of both the study carried out to determine correlation between the joint impedance and its Tangent Delta value and the variation of this last one vs. temperature are presented.
Ondrej Hanus, Jan Mikes, Jakub Kakona
Numerous scientific disciplines such as hydrology, meteorology, oceanography or geology take advantage of remote measuring and monitoring. Data measurement in distant locations and the transmission of measured data is an essential part of these disciplines. The critical element of remote measurement and monitoring systems is a data collecting station. When designing such a device, it is necessary to solve issues of the construction, power system, data transfer or autonomous operation systems. This paper introduces the Autonomous Groundwater Monitoring Station with Wireless Communication...
Xue Wang, Enrico Mohns, Chun Yang Jang, Peter Raether, Hong Yang
An intercomparison of voltage transformer calibration systems was performed between National Center For High Voltage Measurement (NCHVM) and Physikalisch-Technische Bundesanstalt (PTB) in order to confirm their measurement capabilities. Two voltage transformers were used as travelling standards with transformer ratios of 10 kV / 100 V and (110 kV / √3) / 100 V at a frequency of 50 Hz and at ambient temperatures of 23 °C ± 3 °C. The measurements has been performed at test points varying from 20% to 120% of the rated voltage. For the ratio of 10 kV / 100 V the test results differ by no more...
H. Ahmedov, M. Çelik, R. Orhan, B. Korutlu, R. Hamid, E. Şahin
The redefinition of kilogram in terms of Planck constant rather than a physical artifact of International Prototype of Kilogram will be put into force in May 20 th , 2019. National Metrology Institute of Turkey contributes to the ongoing worldwide scientific work on the realization of kilogram with an Oscillating-Magnet Kibble Balance experiment. The novel dynamical measurement procedure developed for Kibble Balance Experiment in Turkey poses the advantage of being less sensitive to the environmental disturbances. Precise displacement measurements between the coil suspended from a balance...
O. Velychko, S. Karpenko, I. Karpenko
This paper deals with some problems concerning the evaluation of uncertainty depends on harmonic voltage distortion for precision electric power measurements and its further influence on evaluation expanded uncertainty of electric power measurements on National standard of electric power and power factor units of Ukraine. In experimental study cases the authors have modulated harmonic voltage distortions and evaluated the uncertainty depends on it. The paper presents the theoretical framework of the problem as well as the results of measurements, which illustrate the presence of the...
Wang Jing, Wang Xuewei
The complex random characteristics of smart grid lead to large dynamic errors of static electricity meters in electrical energy metering. According to the typical intrinsic characteristics of large power dynamic loads (LPDL), this paper firstly proposes a distorted m-sequence dynamic test (DmDT) signal model to reflect the characteristics. In addition, a likelihood function indirect testing method is also proposed to solve the problems of both static electricity meter dynamic error testing and dynamic reference electrical energy traceability. Then, a dynamic error testing system is also...
Lan Qiu, Xuewei Wang, Jing Wang
In order to analyze the error effect of smart electricity meter under different dynamic load current fluctuation and evaluate the errors of smart electricity meter. At first, the models of four units in smart electricity meter are established based on their mechanism, which include voltage channel model, current channel model with a programmable gain amplifier (PGA), active power measurement model and energy measurement model. Secondly, the whole-system model of smart electricity meter is established base on above four models to reflect the inside ralations causing dynamic errors. Finally, a...