Negative Sequence Current Compensation for Induction Motor Stator Inter-Turn Short Circuit and Off -Diagonal Term in Sequence Impedance Matrix as Fault Indicator

Rajamany Gayatridevi,Rajamany Krishnan,Natarajan Ramesh K. 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4

This work proposes an artifi cial neural network supported method to establish an automatic detection of stator turn fault in induction motor. The sequence current analysis is done for turn fault condition. Various factors infl uencing the total measured negative sequence current such as unbalanced voltage and inherent asymmetry have been reviewed. To compensate the voltage unbalance and non-idealities in the machine, utilization of measured negative sequence current, impedance, admittance, or semi empirical formula is developed. The output of a well-trained feed forward back propagation neural network classifi es the severity of fault level in stator winding. The method of considering the eff ects of turn faults on inter-turn fault detection improves sensitivity meanwhile reduces the prospect of misdetection.

An Artificial Neural Networks Application for the Automatic Detection of Severity of Stator Inter Coil Fault in Three Phase Induction Motor

Rajamany, Gayatridevi,Srinivasan, Sekar The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.6

This paper deals with artificial neural network approach for automatic detection of severity level of stator winding fault in induction motor. The problem is faced through modelling and simulation of induction motor with inter coil shorting in stator winding. The sum of the absolute values of difference in the peak values of phase currents from each half cycle has been chosen as the main input to the classifier. Sample values from workspace of Simulink model, which are verified with experiment setup practically, have been imported to neural network architecture. Consideration of a single input extracted from time domain simplifies and advances the fault detection technique. The output of the feed forward back propagation neural network classifies the short circuit fault level of the stator winding.

Third-Order Memristive Morris-Lecar Model of Barnacle Muscle Fiber

Rajamani, Vetriveeran,Sah, Maheshwar PD.,Mannan, Zubaer Ibna,Kim, Hyongsuk,Chua, Leon World Scientific Publishing Company 2017 International journal of bifurcation and chaos in Vol.27 No.4

<P>This paper presents a detailed analysis of various oscillatory behaviors observed in relation to the calcium and potassium ions in the third-order Morris-Lecar model of giant barnacle muscle fiber. Since, both the calcium and potassium ions exhibit all of the characteristics of memristor fingerprints, we claim that the <I>time-varying</I> calcium and potassium ions in the third-order Morris-Lecar model are actually <I>time-invariant</I> calcium and potassium memristors in the third-order memristive Morris-Lecar model. We confirmed the existence of a <I>small unstable limit cycle</I> oscillation in both the second-order and the third-order Morris-Lecar model by numerically calculating the <I>basin of attraction</I> of the <I>asymptotically stable equilibrium point</I> associated with two <I>subcritical Hopf bifurcation</I> points. We also describe a comprehensive analysis of the generation of oscillations in third-order memristive Morris-Lecar model via small-signal circuit analysis and a <I>subcritical</I> Hopf bifurcation phenomenon.</P>

Morris-Lecar model of third-order barnacle muscle fiber is made of volatile memristors

Rajamani, Vetriveeran,Kim, Hyongsuk,Chua, Leon Springer Science + Business Media 2018 Science China. Information sciences Vol.61 No.6

중소형 사업장에서 발생한 유해/비유해 고형폐기물 관리와 처분

( Rajamani S ),( Suthanthararajan R ),( Ramasami T ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2

유해한 범주로 분류된 가죽 분야를 포함하여, 중소형 사업장으로부터의 고형폐기물 처분에 대해서 관심이 증가되고 있다. 200개의 Effluent Treatment Plants (ETPs)와17개의 Common Effluent Treatment Plants (CETPs) 로부터 발생한 유해범주에 속한 탈수 슬러지 200,000ton 의 처분은 인도에서는 중요한 문제 중에 하나이다. 전통적으로 크롬의 50-60%만이 가죽공장 크롬염료 제혁법에 적용되어지며, 그 나머지는 폐수로 배출되어진다. 남 아시아 제혁법은 BCS(Basic Chromium Sulfate)의 형태로 200,000 ton의 크롬이 해마다 사용되며, 약 그 중 80,000 ton의 크롬염은 폐수형태로 배출되어진다. 슬러지 처분문제를 최소화 하는 관점에서, 인도와 다른 남아시아 국가에서는 적절-간단하게 운영되는 크롬 회수 및 재사용 시스템을 개발 및 추진되어졌다. 크롬의 농도가 2-3%인 농도에서 0.5%(Cr)이하로 감소함에 따라, 그 슬러지는 환경부와 산림부 (MoEF) 분류에 의하여 비유해물질로 분류 되어진다. 본 논문은 인도에서 비유해물질 뷴류인 슬러지 및 고형폐기물 뿐만이 아니라 유해범주에 속한 물질에 대해서 commercial scale의 간단하고 자립 가능한 매립처분 방법을 개발 및 채택되는 것에 다루었다. Solid waste disposal from small and medium scale industries including leather sector, which are classified under hazardous category, has become a matter of increasing concern. The disposal of 200,000 tons of dewatered hazardous category sludge generated annually from 200 Effluent Treatment Plants (ETPs) and 17 Common Effluent Treatment Plants (CETPs) is one of the serious problems in India. More than 80% of the tanneries adopt chrome-tanning practice. In traditional chrome tanning practice only 50-60% of the chromium applied is taken by the leather and the balance is discharged as waste. South Asian tanneries use annually 200,000 tons of chromium in the form of Basic Chromium Sulfate (BCS) and out of this about 80,000 tons of chromium salts are discharged as waste. With a view to minimize the disposal problem of sludge, an appropriate, simple and fully operational commercial scale chrome recovery and reuse system was developed and promoted in India and other South Asian countries. Due to the reduction in chromium concentration from the level of 2 to 3% to less than 0.5% as Cr, the sludge is classified as non-hazardous category as per the Ministry of Environment & Forests (MoEF). This paper deals with the simple and viable land disposal methods developed and adopted in India at commercial scale for hazardous category as well as for non-hazardous category sludge and solid wastes.

HAZARDOUS AND NON-HAZARDOUS CATEGORY SOLID WASTE MANAGEMENT AND DISPOSAL FROM SMALL AND MEDIUM SCALE INDUSTRIES

( Rajamani S ),( Suthanthararajan R ),( Ramasami T ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1

Solid waste disposal from small and medium scale industries including leather sector, which are classified under hazardous category, has become a matter of increasing concern. The disposal of 200,000 tons of dewatered hazardous category sludge generated annually from 200 Effluent Treatment Plants (ETPs) and 17 Common Effluent Treatment Plants (CETPs) is one of the serious problems in India. More than 80% of the tanneries adopt chrome-tanning practice. In traditional chrome tanning practice only 50-60% of the chromium applied is taken by the leather and the balance is discharged as waste. South Asian tanneries use annually 200,000 tons of chromium in the form of Basic Chromium Sulfate (BCS) and out of this about 80,000 tons of chromium salts are discharged as waste. With a view to minimize the disposal problem of sludge, an appropriate, simple and fully operational commercial scale chrome recovery and reuse system was developed and promoted in India and other South Asian countries. Due to the reduction in chromium concentration from the level of 2 to 3% to less than 0.5% as Cr, the sludge is classified as non-hazardous category as per the Ministry of Environment & Forests (MoEF). This paper deals with the simple and viable land disposal methods developed and adopted in India at commercial scale for hazardous category as well as for non-hazardous category sludge and solid wastes.

Design of a Low-Frequency Oscillator with PTC Memristor and an Inductor

Rajamani, Vetriveeran,Yang, Changju,Kim, Hyongsuk,Chua, Leon World Scientific 2016 International journal of bifurcation and chaos in Vol.26 No.8

Anxiolytic effect of leaf galls extracts of Pipernigrum Linn. in Swiss Albino mice

Rajesh Rajamani,Sathiyanarayanan L,Arulmozhi S,Ruby 경희대학교 융합한의과학연구소 2009 Oriental Pharmacy and Experimental Medicine Vol.9 No.2

Anxiety disorders are one of the serious problems which need proper therapy devoid of side effects of presently available medicines. The present study evaluates the anxiolytic and sedative activity of leaf galls of Piper nigrum Linn. in Swiss Albino mice. The pet. ether, chloroform, ethyl acetate and ethanol extracts of leaf galls of Piper nigrum Linn were obtained by continuous soxhlet extraction. The prepared extracts were found to be safe up to 2000 mg/kg body weight of mice in the acute toxicity study. Each extract was assessed for anxiolytic activity in Swiss Albino mice by elevated plus Maze, open field test, rota rod test and phenobarbitone induced sleeping time test. In the Elevated Plus Maze test, the pet.ether extract and chloroform extract at a dose of 50 mg/kg b.w. orally, significantly (P < 0.01) increased the number of entries and time spent in open arm comparable with standard diazepam at the dose of 10 mg/kg. b.w. p.o. In the open field test, pet. ether extract (50 mg/kg b.w. p.o.) showed significant increase (P < 0.01) in ambulation and activity in the center. Chloroform extract (50 mg/kg b.w p.o.) was significant (P < 0.05) for both ambulation and center activity. Pet. ether extract (50 mg/kg b.w. p.o) also showed significant activity (P < 0.01) in rota rod test. All the results are comparable with standard diazepam at the dose of 1 mg /kg b.w, p.o. Moreover all the extracts showed significant (P < 0.01) increase in the phenobarbitone induced sleeping time among which pet.ether showed more prominent activity (36%) comparable with control. The results revealed that, the active pet.ether extract and chloroform extract of leaf galls of Piper nigrum Linn is worthwhile to develop the bioactive principle for anxiolytic activity. Anxiety disorders are one of the serious problems which need proper therapy devoid of side effects of presently available medicines. The present study evaluates the anxiolytic and sedative activity of leaf galls of Piper nigrum Linn. in Swiss Albino mice. The pet. ether, chloroform, ethyl acetate and ethanol extracts of leaf galls of Piper nigrum Linn were obtained by continuous soxhlet extraction. The prepared extracts were found to be safe up to 2000 mg/kg body weight of mice in the acute toxicity study. Each extract was assessed for anxiolytic activity in Swiss Albino mice by elevated plus Maze, open field test, rota rod test and phenobarbitone induced sleeping time test. In the Elevated Plus Maze test, the pet.ether extract and chloroform extract at a dose of 50 mg/kg b.w. orally, significantly (P < 0.01) increased the number of entries and time spent in open arm comparable with standard diazepam at the dose of 10 mg/kg. b.w. p.o. In the open field test, pet. ether extract (50 mg/kg b.w. p.o.) showed significant increase (P < 0.01) in ambulation and activity in the center. Chloroform extract (50 mg/kg b.w p.o.) was significant (P < 0.05) for both ambulation and center activity. Pet. ether extract (50 mg/kg b.w. p.o) also showed significant activity (P < 0.01) in rota rod test. All the results are comparable with standard diazepam at the dose of 1 mg /kg b.w, p.o. Moreover all the extracts showed significant (P < 0.01) increase in the phenobarbitone induced sleeping time among which pet.ether showed more prominent activity (36%) comparable with control. The results revealed that, the active pet.ether extract and chloroform extract of leaf galls of Piper nigrum Linn is worthwhile to develop the bioactive principle for anxiolytic activity.

Upregulated Myc Expression in N-Methyl Nitrosourea (MNU)-induced Rat Mammary Tumours

Barathidasan, Rajamani,Pawaiya, Rajveer Singh,Rai, Ram Bahal,Dhama, Kuldeep Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8

Background: The most common incident cancer and cause of cancer-related deaths in women is breast cancer. The Myc gene is upregulated in many cancer types including breast cancer, and it is considered as a potential anti-cancer drug target. The present study was conducted to evaluate the Myc (gene and protein) expression pattern in an experimental mammary tumour model in rats. Materials and Methods: Thirty six Sprague Dawley rats were divided into: Experimental group (26 animals), which received the chemical carcinogen N-methyl nitrosourea (MNU) and a control group (10 animals), which received vehicle only. c-Myc oncoprotein and its mRNA expression pattern were evaluated using immunohistochemistry (IHC) and semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR), respectively, in normal rat mammary tissue and mammary tumours. The rat glyceraldehyde-3-phosphate dehydrogenase (GAPDH) gene was used as internal control for semi-quantitative RT-PCR. Results: Histopathological examination of mammary tissues and tumours from MNU treated animals revealed the presence of premalignant lesions, benign tumours, in situ carcinomas and invasive carcinomas. Immunohistochemical evaluation of tumour tissues showed upregulation and heterogeneous cellular localization of c-Myc oncoprotein. The expression levels of c-Myc oncoprotein were significantly elevated (75-91%) in all the tumours. Semi-quantitative RT-PCR revealed increased expression of c-Myc mRNA in mammary tumours compared to normal mammary tissues. Conclusions: Further large-scale investigation study is needed to adopt this experimental rat mammary tumour model as an in vivo model to study anti-cancer strategies directed against Myc or its downstream partners at the transcriptional or post-transcriptional level.

An Artificial Neural Networks Application for the Automatic Detection of Severity of Stator Inter Coil Fault in Three Phase Induction Motor

Gayatridevi Rajamany,Sekar Srinivasan 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.6

This paper deals with artificial neural network approach for automatic detection of severity level of stator winding fault in induction motor. The problem is faced through modelling and simulation of induction motor with inter coil shorting in stator winding. The sum of the absolute values of difference in the peak values of phase currents from each half cycle has been chosen as the main input to the classifier. Sample values from workspace of Simulink model, which are verified with experiment setup practically, have been imported to neural network architecture. Consideration of a single input extracted from time domain simplifies and advances the fault detection technique. The output of the feed forward back propagation neural network classifies the short circuit fault level of the stator winding.