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This paper gives Interval Linear Programming (ILP) approach based solution to optimal relay coordination problem for microgrid scenario. Relay coordination in microgrids is complex because of varied fault current magnitude and direction due to existence of Distributed Generation (DG). Over-current relays are feasible and economic choice of protection for distribution systems connected with DG. The...
Current distribution network fault location system has a weak fault tolerance. When the information uploaded by FTU is wrong, the misjudgment will often appear. The ant colony algorithm has strong robustness, and it can solve the combinatorial optimization problems better, like distribution network fault location. This paper proposes a fault location method of error correction based on ant colony...
In order to solve the fault location problem of single phase grounding fault in non-solidly earthed distribution network, the constitution, principle and application condition of a new fault locating method are presented in this paper. This method is realized by the distribution automation system (DAS), feeder monitoring unit has been deployed to acquire fault zero sequence current waveform and send...
In this paper, an optoelectronic isolation device is designed to protect the measurement system of underwater discharge acoustic source (UDAS), from the harmful HV-GND drift. In this device, one linear optocoupler HCNR200 and four high speed operation amplifiers are used to perform a symmetric ‘electronic-optic-electronic’ conversion, and a method of setting a biased voltage is used to avoid the problem...
Static Var Compensator (SVC) is used to enhance the power flow in the transmission line by improving the voltage profile. SVC injects/draws the reactive power by varying its susceptance. This variation in susceptance offers new challenges to the ordinary protection techniques. The direction of superimposed energy (SE) can be used to discriminate between forward and reverse faults. However, SE depends...
The paper presents a back-up protection scheme for loop system from all types of fault based on the directional element. The traditional back-up protection schemes such as distance protection and overcurrent protection are not suitable for the loop system. This paper shows a novel back-up protection scheme using the wireless communication, when the main protection doesn't work, the scheme provides...
This paper presents a novel technique of fault detection in high voltage transmission lines using the wavelet transform during power swing condition. Recently, many fields has been applied successfully the wavelet transform. This technique is the absolute sum value of coefficients in multi resolution signal decomposition is utilised based on the discrete wavelet transform (DWT). To discriminate between...
Metro railways are the most widely used mode of public transport in urban areas due to their high speed, capacity and reliability. The current state of art in detecting immediate and long term railway track problems involves both inspectors walking the track lines and train cars instrumented with accelerometers and ultrasonic sensors that are capable of detecting wear of the rail and breakages. But...
This paper presents a fault location algorithm which can accurately locate evolving faults on transmission lines. Evolving faults are types of faults such that the faulted phases change over time. Although locating commonly occurring shunt faults have been widely studied, there is a need for reseach on estimating locations of evolving faults. Locating evolving faults is quite challenging due to rapid...
The aim of this project is to locate fault in the high voltage transmission line (TL) by adopting an accurate fault localization algorithm. First, the fault location was conducted using the conventional method of Ohm's law. Second, the algorithm was implemented by combining a multiple classifier along with Artificial Neural Network (ANN). Finally, the location of the fault was carried out by using...
This paper investigates fault location techniques in high voltage direct current (HVDC) transmission networks utilizing voltage source converters (VSCs). The subject has been extensively researched due to the fault locating actions associated with the supply restoration and the economic loss, and also because of the trending employment of VSC-HVDC transmission systems. However, the fast operation...
The paper deals with detection, localization and handling of single-phase-to-ground faults on medium-voltage power distribution lines. Fault location principle of zero-sequence current phase is described. Results of MATLAB simulations are provided. Design of a system for localization of a single-phase grounding fault section in distribution network is proposed. Arrangement of power line communication...
Despite the technological advances and progress in the industrial systems, the fault diagnosis of the system remains a very important task. Indeed, an effective diagnosis contributes to the improvement of the reliability and also to the decrease in maintenance costs. This paper presents an approach to diagnosis of hybrid systems thanks to the use of the Bond Graph, of Observer and Timed Automata....
This paper present a new and accurate scheme for fault classification of EHV transmission lines using fuzzy logic system. The fault classification scheme is developed by using only the post-fault magnitude of three phases current and its symmetrical components. The proposed fault classification technique is able to classify all faults type can be affect a transmission line such as the single-phase...
The precise knowledge of fault locations is very important as longer period interruption caused by faults are responsible for most of the customer minute losses in the distribution grid. The objective of this paper is to locate different types of faults in a distribution grid by extracting the features of three phase fault currents employing wavelet transform (WT) and feeding the statistical measures...
Discharge systems allowing obtaining the emission spectra for the further analysis are described. Emission spectrum of the discharge plasma for tap water with the addition of metal salts is shown. Problems arising during the development of the devices for analyzing the composition of water are discussed.
This paper presents a survey on location of faults in overhead transmission lines using artificial neural networks. The demand for electricity is raising day by day, with proportional to increase of population, we need to generate more power to meet out the demand. It's a challenging task for power engineers to provide good quality of power to the consumers as per their requirement. In electrical...
Microfluidic biochip has facilitated a revolutionary improvement in biomedical operation or safety critical application like clinical diagnosis, parallel DNA sequencing, toxicity monitoring, immunoassay, air or water quality monitoring, food safety testing etc. But it has faced a major setback from malfunction in fluidic operation due to the defect in the electrodes. In this paper, we are proposing...
Hybrid technique is implemented in this paper to identify the fault location in a 20 KV, 5 km underground cable line with 7.5 MW inductive loads at the delivery end. The projected fault location technique implements properly sampled values of singlecycle post faulty voltage and current signal as of the relayingtermination of the underground cable. Thereafter signaldecomposition has been carried out...
This paper proposes an accurate fault location method for underground power cable in power distribution systems. The cable is modelled using PSCAD EMTP simulation tool. The cable core as well as sheath and various grounding modes were considered in the cable modelling. The algorithm uses voltage and current measurements recorded at the terminal where the fault locator is placed. The simulation studies...
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