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When high voltage direct current (HVDC) system is under the monopolar operation mode, huge direct current (DC) is injected into the earth through the DC grounding electrode, which will result in earth potential changes in a wide range of area. In this case, DC will be coupled into the nearby alternating current (AC) power grid and have some bad influences, called DC bias phenomenon, on the measuring...
The paper is focusing on evaluating the real technical losses within the distribution network. The study was conducted for a distribution system operator within the Romanian Power System. An algorithm is proposed by the authors being able to compute the load dependent and non dependent technical losses. The analyzed area is represented by a real part of the Romanian Power System. Quantitative and...
The Transformer Load Monitoring system (TLM) is a project aimed to reduce cost, increase efficiency and improve services to customers. The project was created by Metropolitan Electricity Authority (MEA) Thailand. The purpose was to build a monitoring system for medium voltage distribution transformers. These transformers have been installed on roadside electric poles around Bangkok. Transformers'...
According to the disadvantages of the recent current transformer in reliability stability and accuracy, which is caused by analog transmission and the shortage of the complex cabling with many nodes in the signal of current transformer, a three-phase power current transformer based on CAN transmission is designed. The design ideas and basic composition of the current transformer is intrduced in this...
This paper is focused on implementing an online monitoring system that checks power facility status by applying network based technology to Urban Transit substation power facilities and the results of its on-field tests. This system is composed of a sensor part, a measurement part, a transceiver part, a host computer, and a power source part. The system is designed to collect, save, analyze, and display...
Many studies have been conducted to monitor the degradation of MO arresters. The arresterpsilas leakage current, in particular, the third harmonic component of the resistive leakage current, is known to be directly related to the degree of degradation of the MO arrester. In order to extract the resistive component from the total leakage current, the voltage across the arrester terminals is usually...
Fixed Series Compensation (FSC) employs capacitors to compensate the inductive reactance of transmission lines, being a highly effective and economical means of improving power transfer. A Fixed Series Compensation Monitoring System has as objective the knowledge of the actual physical state of this FACTS (Flexible AC Transmission Systems) system and diagnose the evolution of components damage, so...
The analysis the main characteristic of used relay protection (RP) selectivity is made. The most full realization of this characteristic is proven to have differential protection. On the ground of this reason and analysis of the arc monitoring the short circuits there are formulated two principles of the building RP: usual metric which is used for building all the types existing RP with measuring...
This paper presents a distributed measuring system for on-line monitoring of dielectric loss factor tan delta, and capacitance of HV apparatus. The method employs the discrete Fourier transform (DFT) which is performed on the scaled down analog voltage and current signals obtained using digital signal processing (DSP) technology. The measuring unit of the on-line monitoring system takes a series of...
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