This paper presents a new investigation to detect various faults within the three-phase star and delta induction motors (IMs) using frequency response analysis (FRA). In this regard, experimental measurements FRA are performed on three IMs of ratings 1 HP, 3 HP 5.5 in normal conditions, short-circuit fault (SC) open-circuit (OC) conditions. The SC OC applied artificially between turns (Turn-to-Turn), coils (Coil-to-Coil) phases (Phase-to-Phase). obtained show that result dissimilar...

The industry has widely accepted Frequency Response Analysis (FRA) as a reliable method to detect power transformers mechanical deformations. While the FRA technique been recommended in recent literature potential diagnostic internal faults within rotating machines, detailed feasibility studies have not fully addressed yet. This paper investigates of using several short circuit stator winding three-phase induction motors (TPIMs). In this regard, testing is conducted on two sets with various...

Polymeric insulators, in particular silicone rubber (SIR) are lightweight, have good hydrophobicity characteristics, and easy to carry install. They commonly used for outdoor insulation power lines. However, pollution, UV radiation, temperature, discharge, wetness, stress can cause them degrade over time, losing their electrical properties. Therefore, evaluating the ageing degradation of polymeric insulators under different conditions becomes crucial. This paper investigates effects with...

Cooperative communication systems, which make use of the intermediate relays between transmitter and receiver, have been employed as an effective technique to combat channel fading enhance system performance. systems some drawbacks such high latency may diversity order not guaranteed. To alleviate negative effects these factors, relay selection protocol is in cooperative increase overall Relay enables source cooperate with single node rather than multiple nodes guaranteed order.

This study aimed to preconcentration of sulfamethoxazole (SMX) in water and biological samples. Ultrasound-assisted dispersive liquid-liquid microextraction (UA-DLLME) ultrasound-assisted solid-phase (UA-DSPME) methods paired with spectrophotometry were applied extraction SMX. ZnFe 2 O 4 nanoparticles prepared as adsorbent UA-DSPME method by hydrothermal method. The scanning electron microscopy (SEM) technique showed that the had symmetrical, bullet-shaped particles uniform size. results...

The purpose for preparing this paper is to innovate a new method detection and diagnosis the three-phase induction motor electrical failures, especially failures that occur in Stator winding. winding breakdown largely contributes failures. To understand internal fault motors winding, four cases studies of different (TPIM) were analysed according two conditions: normal condition windings shorted between phases. In paper, measurement frequency response analysis (FRA) on stator with inter-phase...

<p>The paper presents the description for diagnostic methods of induction motor's stator windings fault. The presented use Frequency Response Analysis (FRA) technique detection Winding Faults in Induction Motor . This method is previously reliable faults diagnosis and many parts transformers including transformer windings. In this paper, was used motor detection. FRA response interpretation on internal short circuit (SC) fault at winding three cases studies different three-phase motors...

Research on synthetic methods for the preparation of oxazoles is an important issue among chemists because oxazole derivatives are structural subunits various natural active products and valuable pharmaceutical precursors. In this research work, we constructed CuBr supported surface magnetic Fe3O4 nanoparticles modified with 6-(aminomethyl)nicotinic acid [Fe3O4@AMNA-CuBr nanocomposite] evaluated its catalytic activity highly substituted through one-pot three-component reactions...

Frequency response analysis (FRA) method has been proven to detect the transformer winding damage. However, there is no practical study which investigates damages on tap changer even though it a high failure rate. Hence, this paper normal and faulty using FRA. The FRA measurements conducted four different test configurations. Also, changer, pitting coking contact were investigated. In addition measurement, resistance measurement conducted. turn ratio also identify taps positions. This...

Different techniques for monitoring the transformer condition are continuously discussed. This is due to fact that transformers one of most expensive components in power system network. Not mention cost fix any failure occurred have becoming more nowadays. Frequency response analysis (FRA) found be best method monitor reliability. paper presents a continuation study presented previous [1]. The performed laboratory test show normal winding phase A can affected by short circuit fault which at...

The short circuit fault detection practices of power-transformer winding are important to ensure its unfailing and proper operation. In this regard, Frequency response analysis (FRA) is a favourable tool that can be used detect such fault. FRA method has four measurement configurations called: end-to-end; open test, inductive inter-winding capacitive test. However, detecting the using end-to-end investigated. This paper aims on investigating faults by showing bipolar signature. been obtained...

Given that thermoelastic damping (TED) is one of the main causes energy dissipation in miniaturized structures, calculation its exact amount particular importance design such elements. Considering three-dimensional (3D) heat transfer along with scale effect on both mechanical and thermal areas decisive factors more rigorous modeling TED small-sized resonators. This paper exploits modified couple stress theory (MCST) dual-phase-lag (DPL) conduction model to establish an analytical relation...

This paper presents a study on the applicability of frequency response analysis (FRA) for diagnosing faulty stator winding three-phase induction motor. Initially, two different faults were simulated 2.2 kW FRA tests performed units before and after fault to observe influence response. Three statistical indicators used compute amount changes between responses. was done three ranges, which are low, medium, high regions, as each region governed by parameters, namely resistance, inductance,...

Frequency Response Analysis (FRA) technique has been recognized by worldwide utilities as a matured technology to assess the mechanical integrity of power transformers. While some industrial critical assets such induction motors have same construction principle transformers, application FRA not yet fully explored. This paper presents analogical experimental studies for on transformers and motors. For consistent analogy, employed detect short open circuit turns in both appliances, which helps...