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Reliable and eco-friendly power demand at consumer load end leads to integration of local distributed generation (DG) based micro-grids in the electricity network. Adequate local load sharing between the DG's in the micro-grids is necessary in islanded mode under faulty grid condition. This paper presents a grid connected micro-grid system with a back-to-back voltage source converter (VSC) based DG...
This paper presents a novel simplified cost effective binary based mechanism for eliminating problems in existing condition monitoring and diagnostic techniques. The existing techniques are engraved with problems like high cost of their implementation, failure to detect multiplicity of faults, complicated diagnosis system, expert knowledge, inherent ambiguities etc. The mechanism developed in this...
This paper presents a simplined approach for detecting faults in induction motors using an economic and easily implementable technique. The proposed technique uses an observer coil (OC) located into stator slots, and laid over the stator coil parallel to it. A sinusoidal voltage is induced in the OC due to the interaction with the stationary stator and the dynamic rotor. The frequency components analysis...
This paper presents a novel radial flux sensing technique to detect and locate stator inter-turn faults in induction motors in online mode. The proposed simplified, inexpensive technique has yet not been reported in literature. The methodology is based on the use of observer coils placed in stator slots along with the stator winding. A sinusoidal voltage is induced in the observer coil (OC) due to...
This paper presents use of no-load current harmonic analysis to detect presence of inter-turn fault at incipient stage. At steady state, third and fifth harmonic components are predominant in transformer no-load current. Inception of fault results in decrease in THD and increase in increase in primary current. Based on reduction of total harmonic distortion (THD) of each phase and simultaneous increase...
Detection of transformer inter-turn fault at early stage is essential for increasing life of transformer and avoiding economical impacts. This paper presents a novel approach to detect transformer inter-turn fault by search coil induced voltage analysis. A healthy winding is associated with symmetrical leakage flux pattern. With initiation of inter-turn fault it does not remain symmetrical and creates...
In Maharashtra, the heavy penetration level of grid connected wind energy has been used and due to this, the power quality of electric power system gets affected. This paper is described the Power Quality Disturbance Analysis of Grid Connected Wind Energy by using wavelet Transform. The effect of wind speed on power quality of grid connected wind energy of a case study system has been described. due...
Power transformer is a strategically important component of power system due to its location and size. Sudden failure of power transformer has both technical and economical impacts. Studies indicate that inter turn fault is one of the major cause of transformer failure. Detection of presence of such fault at an early stage is important to avoid further damage. Objective of this paper is to analyse...
This topic represents a technical review of Power Quality problems associated with the Renewable based wind energy system and the investigation of causes of poor power quality issues related with grid connected wind farm. Renewable Energy Source (RES) integrated at distribution level is termed as Distributed Generation(DG).The utility is concerned due to the high penetration level of wind energy in...
Objective There is currently no system in widespread use that accurately prioritizes colorectal referrals in symptomatic patients with an acceptable degree of sensitivity and specificity. We have validated a weighted numerical scoring system for the prioritization of such colorectal referrals in an attempt to rectify this, with detection of colorectal cancer (CRC) the primary outcome.
Method We...
Sensitive equipment and non-linear loads are now more common in both the industrial/commercial sectors and the domestic environment. Because of this a heightened awareness of power quality is developing amongst electricity users. Therefore, power quality is an issue that is becoming increasingly important to electricity consumers at all levels of usage. This article presents the fuzzy system to determine...
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