Modeling of rogowski coil for on-line PD monitoring in coveredconductor overhead distribution networks (original) (raw)
Related papers
Modelling and simulation of online partial discharge measurement for medium voltage power cable
Bulletin of Electrical Engineering and Informatics, 2020
This paper presents the modelling of the online partial discharge (PD) measurement of the medium voltage (MV) power cable. Recently, PD monitoring trends are rapidly increasing due to high demand on reliable systems. Degradation are mainly due to the presence of PD in the high voltage power equipment used. PD measurement is therefore a highly recommended task to early detection of the degradation insulation for high voltage (HV) equipment in order to avoid breakdowns. Real network modelling is necessary to improvise system design in order to find the efficiency in a real power system network. In this paper, modelling focuses on a real distribution network by applying Rogowski coil (RC) as a detection sensor to trigger PD activity. The simulation is performed to determine the functionality and reliability of the system with the RC application in the network. The analysis is performed in the ATP-EMTP and MATLAB Simulink software environments. In addition, this paper contributed to jus...
Partial Discharge (PD) is one of a symptom in the underground cable before the fault happens. This paper concerned with estimation and detection problems related to PD phenomena in buried underground cables. The Rogowski coil has been implemented to analyze this symptom. The various sizes of nominal cross-sectional area cross-linked polyethylene (XLPE) cable with 6.35/11 KV single core unarmored aluminum conductors that follows Nexans manufacturer datasheet based on design standard IEC 60502 has been used in the simulation using Electromagnetic Transient Program-Alternative Transient Program (EMTP-ATP) software. The Lumped parameter is used for the Rogowski coil sensor model. Meanwhile, for Double-end measurement using J-Marti model is designed to evaluate the parameter changing in the measurement. Based on the measurement, the value of amplitude voltage and current is proportional increase depends on the size of cross-sectional area of conductor XLPE cable.
IET Conference Publications, 2009
This paper presents the evaluation and simulation of real lightning discharges that have occurred in medium voltage overhead lines equipped with covered conductors (CC). Lightning stroke current selections are based on real lightning data collected from the Finnish Meteorological Institute (FMI) from 1998 to 2008. The presented feeder is an overhead distribution line with a covered conductor subjected to direct lightning strokes to a line support. With the ATP/EMTP (Alternative Transient Program/Electro-Magnetic Transient Program), simulations of lightning strokes are conducted with different lightning current characteristics. All cases are considered with the modelling guidelines for fast transients, as specified in some lightning literature. Simulations are made to compare the resulting overvoltages and energy absorptions of surge arresters for all the analyzed cases.
International Journal of Electrical Power & Energy Systems, 2012
Partial discharge (PD) detection has been regarded as one of the most effective on-line predictive maintenance test and diagnostic tool for the condition monitoring of high voltage (HV) equipments. The relatively new and challenging application is conducting on-line high frequency PD measurements for the monitoring of falling trees on the covered-conductor (CC) overhead distribution lines. Generally, the high frequency PD measurements taken in high voltage (HV) laboratory Faraday cage are not prone to electromagnetic disturbances (EMDs). However, various external interferences may corrupt on-line and on-site measurements. Getting very low magnitude PD signals from measurements taken in corrupt environment is one of the big challenges for continuous monitoring. In this paper, wavelet transform (WT) is suggested as a powerful technique to remove noise and disturbances from PD signals captured in CC overhead distribution networks, which are completely absorbed by electromagnetic interferences (EMIs). The advantages and difficulties faced while taking on-line and on-site PD measurements have been discussed. Pearson coil is used as a sensor to detect PDs for this specific application. In the next stage of future developments, the proposed methodology would be implemented in a real-life environment using many Pearson coils to get reliable on-line and on-site PD measurements to detect and localize falling tress on CC overhead distribution networks. The condition monitoring and insulation diagnosis of the other valuable distribution network components can also be carried out using this technique to cope with the requirements of future smart grids.
This paper is about analyzing the Rogowski Coil for measuring the partial discharge phenomenon in high voltage apparatus. Designing optimally, we can measure the high frequency and low amplitude currents like PD pulses more efficiently using the mentioned device. Besides, it is possible to find the accurate place of the fault using the signal processing methods. Other advantages include low cost, being non-interfering for the network, ability to send data wirelessly and ability to be used online. Designing approaches for the coil to have a wide band and high gain measuring device are discussed and the equivalent circuit is analyzed theoretically and is simulated for variation of parameters. These results are examined practically by making some special coils and testing under accepted methods for PD measurements.
Vogelsang ETEP-Journal Detection of electrical tree propagation by partial discharge measurements
The partial discharge activity during propagation of electrical treeing in epoxy resin is described. The electrical trees grew in needle-plane samples without and with an internal barrier up to the final breakdown. The simultaneous taken tree growth and discharge activity show a correlation between the propagation state of the tree and the thereby measured PD. Especially the changes in the tree structure can clearly be detected. Based on these characteristics a new model describing tree growth will be presented. It appears that measurements from machine insulation can be interpreted in terms of the PD pattern.
Real On-Site Partial Discharge Measurement Technique in Medium Voltage Power Cable
2018 IEEE 7th International Conference on Power and Energy (PECon), 2018
This paper presents the measurement and detection techniques of partial discharge (PD) on medium voltage power cable with the idea to propose simplest and accurate online on-site PD measurement. The Rogowski Coil (RC) has been choose as measuring sensor to detect and measure PD signal at site. A real 11kV site at northern Malaysia substation was selected to perform the measurement with considering current PD measurement technique by utility. The propose method is used to locate the PD signal in three phase MV underground cross-link polyethylene (XLPE) cable with 240 mm 2 size and 3 km length between two substations. On-site measurement has been carried out to verify the ability of method to detect PD signal and compare with previous method by utility. The analysis of PD signal using FFT was performed to characterize the actual PD signal. In this paper, results indicate that the measurement technique performed better and easier in detecting PD signal for online condition.
Analysis of distribution lines performance against lightning using ATP-EMTP
International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
The focus of this study is to analyze the performance of a distribution line struck by direct lightning in a particular point of its length. In this paper the analysis is based on the flashover and backflashover calculation due to lightning using the Alternative Transients Program -ATP. Parametric studies using this software are also performed to determine the sensitivity of the flashover and backflashover occurrence, taking into account some parameters of the distribution line. Models of the distribution system components are also presented. The models are based on the representation of the distribution line taking into account the frequency dependence of its electrical parameters. Poles and towers, insulators chain, cross-arm and grounding systems are also modeled by an equivalent electric circuit.
In this paper, Electromagnetic Transient Program-Alternative Transient Program (EMTP-ATP) test bench of 20 kV network is developed considering high frequency models of Rogowski coil and the distribution network. The bench test is used to evaluate the Rogowski performance with different fault scenarios such as different fault types, different fault resistances and inception angles. Furthermore, the tree leaning fault and arcing fault with characteristics of intermittent faults are considered in the study. Results show the possibility of using Rogowski coil for locating faults in the medium voltage (MV) distribution networks.