Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9112867
Gom Dorji, Jigme Zangpo, R. Pindoriya, B. Rajpurohit
With increase in energy demand, more numbers of renewable energy systems (RES) are connected to the grid. The integration of RES to the main electrical grid, causes the distortion in current and voltage waveforms. This distorted waveform has detrimental effects to the loads connected to that system. Grid systems’ current and voltage waveforms are also non-sinusoidal, when non-linear loads are connected to it. In this paper, current and voltage waveforms data from both grid side and output terminal of wind farm are collected by connecting fluke power quality analyzer (PQA) instrument and harmonic content are examined. Later it is compared with institute of electrical and electronics engineers (IEEE) and international electro technical commission (IEC) standards limits and conclusions are drawn from the analysed results.
{"title":"A Case Study on Power Quality Analysis for 600 kW Grid Connected Wind Farm","authors":"Gom Dorji, Jigme Zangpo, R. Pindoriya, B. Rajpurohit","doi":"10.1109/PIICON49524.2020.9112867","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9112867","url":null,"abstract":"With increase in energy demand, more numbers of renewable energy systems (RES) are connected to the grid. The integration of RES to the main electrical grid, causes the distortion in current and voltage waveforms. This distorted waveform has detrimental effects to the loads connected to that system. Grid systems’ current and voltage waveforms are also non-sinusoidal, when non-linear loads are connected to it. In this paper, current and voltage waveforms data from both grid side and output terminal of wind farm are collected by connecting fluke power quality analyzer (PQA) instrument and harmonic content are examined. Later it is compared with institute of electrical and electronics engineers (IEEE) and international electro technical commission (IEC) standards limits and conclusions are drawn from the analysed results.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114692283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9113025
Rahul Dogra, B. Rajpurohit
The work proposes sign regressor least mean square algorithm (SRLMS), an adaptive control algorithm for grid-connected solar PV generator system. Proposed adaptive filtering based algorithm is designed for DC to AC conversion with desired voltage and frequency values along with correct phase sequence for grid synchronization. Also, the algorithm aims to incorporate functionalities such as harmonic compensation and VAR generation, load balancing, adaptive DC link voltage regulation, etc. A two-stage three-phase grid-connected PV system is used to test the adaptive algorithm with linear as well as non-linear loads. The system is simulated in MATLAB with Simulink toolbox. Simulation results obtained show the effectiveness of the applied algorithm under steady and dynamic state operations. The total harmonic distortions (THD) of grid current and point of common coupling (PCC) voltage are achieved well within recommended limits according to an IEEE-519 standard.
{"title":"Sign Regressor LMS Algorithm Based Adaptive Control Algorithm for Multi-objective Solar PV Generator System Connected to Grid","authors":"Rahul Dogra, B. Rajpurohit","doi":"10.1109/PIICON49524.2020.9113025","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9113025","url":null,"abstract":"The work proposes sign regressor least mean square algorithm (SRLMS), an adaptive control algorithm for grid-connected solar PV generator system. Proposed adaptive filtering based algorithm is designed for DC to AC conversion with desired voltage and frequency values along with correct phase sequence for grid synchronization. Also, the algorithm aims to incorporate functionalities such as harmonic compensation and VAR generation, load balancing, adaptive DC link voltage regulation, etc. A two-stage three-phase grid-connected PV system is used to test the adaptive algorithm with linear as well as non-linear loads. The system is simulated in MATLAB with Simulink toolbox. Simulation results obtained show the effectiveness of the applied algorithm under steady and dynamic state operations. The total harmonic distortions (THD) of grid current and point of common coupling (PCC) voltage are achieved well within recommended limits according to an IEEE-519 standard.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123449874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9113016
N. Adhikari, Ujjwal Kumar Kalla
This paper deals with the study of partial discharge characteristics of 11kV XLPE insulated power cables. Two most common types of issues are considered along with the healthy insulation to study the PD (Partial discharge) characteristics, these are acknowledged as the main cause of insulation deterioration during installation and operation. In this study, a cable under measurement is subjected to mechanical embrasure and insulation chipping. The condition of rough insulation screen is also considered for measurement and analysis of PD characteristics. The method of measurement followed is as per the specified method in the applicable IEC standard. The experimental results are presented under the rated and at higher operating voltages of the cable. The analysis has been carried out and it verifies that these defects are the major contributor to the local discharge phenomena and the measured discharge quantity is on the higher side. The resultsare presented for PD patterns of the induced defects present dissimilarity, which can be utilized as samples for further PD pattern recognition.
{"title":"Analysis of Partial Discharge Measurements in High Voltage XLPE Cable","authors":"N. Adhikari, Ujjwal Kumar Kalla","doi":"10.1109/PIICON49524.2020.9113016","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9113016","url":null,"abstract":"This paper deals with the study of partial discharge characteristics of 11kV XLPE insulated power cables. Two most common types of issues are considered along with the healthy insulation to study the PD (Partial discharge) characteristics, these are acknowledged as the main cause of insulation deterioration during installation and operation. In this study, a cable under measurement is subjected to mechanical embrasure and insulation chipping. The condition of rough insulation screen is also considered for measurement and analysis of PD characteristics. The method of measurement followed is as per the specified method in the applicable IEC standard. The experimental results are presented under the rated and at higher operating voltages of the cable. The analysis has been carried out and it verifies that these defects are the major contributor to the local discharge phenomena and the measured discharge quantity is on the higher side. The resultsare presented for PD patterns of the induced defects present dissimilarity, which can be utilized as samples for further PD pattern recognition.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123946054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9112928
Virendra Singh, N. Tummuru, Bharat Singh Rajpurohit
Battery chargers and charging infrastructures are playing a vital role in the deployment of electric vehicles (EVs). Battery chargers must have advantages like high efficiency, more reliable, high power density, low cost, less volume, and weight. Four important factors are barriers in the development of EVs these are 1. battery life and high cost, 2. complexity of chargers, 3. lack of charging infrastructure and 4. chargers introducing harmonic to the utility grid. To reduce cost, weight, and size of on-board chargers, integrated battery chargers are proposed in kinds of literature. Integrated charger topology works with two modes of operation separately, propulsion (motoring) mode and charging mode. In this paper delta connected brushless direct current (BLDC) motor has been used for propulsion mode and same motor stator windings used as coupled inductances for charging mode of operation. In this paper hardware results with boost converter as a power factor correction circuit and MATLAB simulation results of two-channel interleaved boost converter (TCIBC) are presented. Total harmonic distortion (THD) for grid current with a single-channel boost converter (SCBC) 6.68% and simulation results with TCIBC 1.45% respectively. Also, mathematical modeling with delta connected motor is presented and a steady-state voltage gain equation has been derived with TCIBC.
{"title":"Integrated Battery Charger with Delta Connected BLDC Motor for Electric Vehicle Applications","authors":"Virendra Singh, N. Tummuru, Bharat Singh Rajpurohit","doi":"10.1109/PIICON49524.2020.9112928","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9112928","url":null,"abstract":"Battery chargers and charging infrastructures are playing a vital role in the deployment of electric vehicles (EVs). Battery chargers must have advantages like high efficiency, more reliable, high power density, low cost, less volume, and weight. Four important factors are barriers in the development of EVs these are 1. battery life and high cost, 2. complexity of chargers, 3. lack of charging infrastructure and 4. chargers introducing harmonic to the utility grid. To reduce cost, weight, and size of on-board chargers, integrated battery chargers are proposed in kinds of literature. Integrated charger topology works with two modes of operation separately, propulsion (motoring) mode and charging mode. In this paper delta connected brushless direct current (BLDC) motor has been used for propulsion mode and same motor stator windings used as coupled inductances for charging mode of operation. In this paper hardware results with boost converter as a power factor correction circuit and MATLAB simulation results of two-channel interleaved boost converter (TCIBC) are presented. Total harmonic distortion (THD) for grid current with a single-channel boost converter (SCBC) 6.68% and simulation results with TCIBC 1.45% respectively. Also, mathematical modeling with delta connected motor is presented and a steady-state voltage gain equation has been derived with TCIBC.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129389148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9112902
Himanshu Grover, Ashu Verma, T. Bhatti
This paper aims at hardware-in-loop (HIL) implementation of load frequency control (LFC) and automatic voltage regulation (AVR) schemes for a single area power system. The single area power system consists of a synchronous generator based non-reheat thermal area unit serving linear loads. In order to minimize the power mismatch between the generation and load, LFC & AVR control strategies have been developed considering the dynamics of thermal area power system. The control strategies have been developed to operate in a continuous mode of operation using conventional Proportional-Integral (PI) controller. 3%, 8% & 10% variations of load has been considered to validate system performance at various loading levels. HIL implementation has been achieved using dPSACE MicroLabBox which interfaces the controller developed in MATLAB/Simulink platform to the hardware components.
{"title":"Load Frequency Control & Automatic Voltage Regulation for a Single Area Power System","authors":"Himanshu Grover, Ashu Verma, T. Bhatti","doi":"10.1109/PIICON49524.2020.9112902","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9112902","url":null,"abstract":"This paper aims at hardware-in-loop (HIL) implementation of load frequency control (LFC) and automatic voltage regulation (AVR) schemes for a single area power system. The single area power system consists of a synchronous generator based non-reheat thermal area unit serving linear loads. In order to minimize the power mismatch between the generation and load, LFC & AVR control strategies have been developed considering the dynamics of thermal area power system. The control strategies have been developed to operate in a continuous mode of operation using conventional Proportional-Integral (PI) controller. 3%, 8% & 10% variations of load has been considered to validate system performance at various loading levels. HIL implementation has been achieved using dPSACE MicroLabBox which interfaces the controller developed in MATLAB/Simulink platform to the hardware components.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131037014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9113071
T. Halder
In this paper, state space and stability analysis are revalued to restructure with the published articles for the practical applications before implementation of the Flyback power converters. The design guidelines and optimizations are espoused in such a manner to heighten high power conversion ratio, transient response, tight regulations, compact dimension, robust reliability and high power density in the converter for the transportable applications
{"title":"State Space Modeling and Stability Analysis of the Flyback Converter","authors":"T. Halder","doi":"10.1109/PIICON49524.2020.9113071","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9113071","url":null,"abstract":"In this paper, state space and stability analysis are revalued to restructure with the published articles for the practical applications before implementation of the Flyback power converters. The design guidelines and optimizations are espoused in such a manner to heighten high power conversion ratio, transient response, tight regulations, compact dimension, robust reliability and high power density in the converter for the transportable applications","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132897982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9112929
Vinit Srivastava, B. Rajpurohit, M. Kaur
In nanocomposite, nano interface is considered as the cause for better insulation strength, but its understanding is still unknown. In this paper, the focus is on the interface of the filler/polymer matrix. The finite element simulation results show many aspects to enhance the dielectric strength by investigating nanocomposite. First, it has been found that as the permittivity of the nanofiller, polymer base and interface permittivity increases the dielectric strength increases. At last, a novel approach has been taken into account by configuring two particles hierarchically in search to find the best configuration for better insulation. Finally, the practical importance of this work is, it can be used to understand nano interface in nanodielectrics and future investigators can use this study as a reference to choose material for experimental investigation in order to obtain better insulation.
{"title":"Investigation of Factors Affecting Nano-dielectric Strength under High Voltage Stress using Finite Element Method","authors":"Vinit Srivastava, B. Rajpurohit, M. Kaur","doi":"10.1109/PIICON49524.2020.9112929","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9112929","url":null,"abstract":"In nanocomposite, nano interface is considered as the cause for better insulation strength, but its understanding is still unknown. In this paper, the focus is on the interface of the filler/polymer matrix. The finite element simulation results show many aspects to enhance the dielectric strength by investigating nanocomposite. First, it has been found that as the permittivity of the nanofiller, polymer base and interface permittivity increases the dielectric strength increases. At last, a novel approach has been taken into account by configuring two particles hierarchically in search to find the best configuration for better insulation. Finally, the practical importance of this work is, it can be used to understand nano interface in nanodielectrics and future investigators can use this study as a reference to choose material for experimental investigation in order to obtain better insulation.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131956081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9113040
Raghav R. Upasani, Nitin Pandey, Ishant Jain
Transformer is an essential component used in electrical power distribution and transmission systems. Present electrical distribution system demands reliable, safe and efficient distribution of power. However, 8% of the transformer installed worldwide fails because of the improper connector systems. In this paper, we discuss novel design of transformer connector, called as trafo-connector, where LV cables are connected. The objective of the new design was to eliminate all the limitations of the conventional connector such as overheating due to improper contact, heavy weight, installation difficulties, etc. The newly developed Trafo-connector has significantly increased reliability of the transformer as it is light in weight, simple to install and maintains low contact resistance. Moreover, a detailed FEA analysis of short-circuit test and tensile load test are carried out as per IEC standard and are validated with experimental results.
{"title":"Design and FEM Analysis of Trafoconnect","authors":"Raghav R. Upasani, Nitin Pandey, Ishant Jain","doi":"10.1109/PIICON49524.2020.9113040","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9113040","url":null,"abstract":"Transformer is an essential component used in electrical power distribution and transmission systems. Present electrical distribution system demands reliable, safe and efficient distribution of power. However, 8% of the transformer installed worldwide fails because of the improper connector systems. In this paper, we discuss novel design of transformer connector, called as trafo-connector, where LV cables are connected. The objective of the new design was to eliminate all the limitations of the conventional connector such as overheating due to improper contact, heavy weight, installation difficulties, etc. The newly developed Trafo-connector has significantly increased reliability of the transformer as it is light in weight, simple to install and maintains low contact resistance. Moreover, a detailed FEA analysis of short-circuit test and tensile load test are carried out as per IEC standard and are validated with experimental results.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132269329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9113047
S. Arya, Sayed Javed Alam
This paper addresses the functions of unified power quality controller (UPQC) during Power quality (PQ) issues on the distribution networks. The poor power quality is mainly a cause of harmonic currents, lower power factor, variation in supply voltage, etc. A UPQC is a Custom Power Devices (CPD) that reduces the voltage and current related PQ problems in the power distribution system. The proposed control algorithm for UPQC is a frequency adaptive loop (FAL) on first transformed module (FTM) of the observer method. As in most Phase Lock Loop (PLL) algorithms, where the transformation of variables into a synchronous reference frame is required to get phase angle detection. Nevertheless, in the case of FTM based FAL, it does not require conversion to estimate phase angle. The angular frequency used to detect unknown estimated parameters and positive-negative elements of the signal under any PQ problems. Another side, the optimal tuned value of proportional-integral (PI) gains are calculated using Firefly algorithm. So, the PI-controller gains are improving dynamic execution of UPQC Controller. The results are captured using MATLAB-Simulink and validated in real time to support the functionality of the UPQC.
本文论述了统一电能质量控制器(UPQC)在配电网电能质量问题中的作用。电能质量差的主要原因是谐波电流、功率因数低、电源电压变化等。UPQC (Custom Power Devices)是一种可降低配电系统中与电压和电流相关的PQ问题的自定义电源器件。提出的UPQC控制算法是在观测器方法的第一变换模块(FTM)上加一个频率自适应环路(FAL)。与大多数锁相环(PLL)算法一样，需要将变量转换为同步参考系来进行相角检测。然而，在基于FTM的FAL中，它不需要转换来估计相角。在任何PQ问题下，用于检测未知估计参数和信号正负元素的角频率。另一方面，采用萤火虫算法计算比例积分增益的最优调谐值。因此，pi控制器的增益改善了UPQC控制器的动态执行。使用MATLAB-Simulink捕获结果并进行实时验证，以支持UPQC的功能。
{"title":"Control of UPQC through Observer based System Integrated with Frequency Adaptive Loop and optimized PI Gains","authors":"S. Arya, Sayed Javed Alam","doi":"10.1109/PIICON49524.2020.9113047","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9113047","url":null,"abstract":"This paper addresses the functions of unified power quality controller (UPQC) during Power quality (PQ) issues on the distribution networks. The poor power quality is mainly a cause of harmonic currents, lower power factor, variation in supply voltage, etc. A UPQC is a Custom Power Devices (CPD) that reduces the voltage and current related PQ problems in the power distribution system. The proposed control algorithm for UPQC is a frequency adaptive loop (FAL) on first transformed module (FTM) of the observer method. As in most Phase Lock Loop (PLL) algorithms, where the transformation of variables into a synchronous reference frame is required to get phase angle detection. Nevertheless, in the case of FTM based FAL, it does not require conversion to estimate phase angle. The angular frequency used to detect unknown estimated parameters and positive-negative elements of the signal under any PQ problems. Another side, the optimal tuned value of proportional-integral (PI) gains are calculated using Firefly algorithm. So, the PI-controller gains are improving dynamic execution of UPQC Controller. The results are captured using MATLAB-Simulink and validated in real time to support the functionality of the UPQC.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"vmr-5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127930322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1109/PIICON49524.2020.9112920
Jeyabalan Velandy, Ankita Garg, C. Narasimhan
The study on oil flow rate, pressure drop (pressure losses) behaviour of ester oil group (both natural and synthetic ester oil) due to its higher viscous nature is important for thermal designer during thermal design stage, since oil flow distribution within the winding has a direct impact on thermal performance of the transformer. During oil directed (OD) cooling modes, the static pressure drop over the continuous disc type of winding determines the ester oil split among low voltage windings (LV) and high voltage windings (HV) which is connected hydraulically in parallel. In addition, the oil flow distribution in disc type of transformer windings in conjunction with power loss (no-load and load loss) of transformer will decide the location and magnitude of the hotspot temperature in transformer. Hence, there is still a technical challenge with ester oil for transformer manufacturers and utilities to use in large rating power transformers mainly in OD cooling modes. In this paper, the effects of mineral oil and ester oil on frictional pressure, gravitational pressure, oil flow rate, velocity in cooling duct, temperature distributions in top and bottom insulation, main winding zones, core, radiators and coolers are investigated under OD cooling conditions. The typical transformer rating of 60/75/90MVA, 220/33kV is considered for thermal analysis. Since, natural ester oil and synthetic ester oil are potentially different in thermal properties, the thermal analysis results are compared with mineral oil. The thermal hydraulic network model (THNM model) are used for fast calculations of thermal parameters in typical large power transformer. The power losses distributions are calculated from FEM based simulations as an input for thermal analysis.
{"title":"Prediction of Static Pressure Drop, Velocity and Flow Rate of Higher Viscous Nature of Ester Oil in Power Transformers under Oil Directed Cooling Conditions","authors":"Jeyabalan Velandy, Ankita Garg, C. Narasimhan","doi":"10.1109/PIICON49524.2020.9112920","DOIUrl":"https://doi.org/10.1109/PIICON49524.2020.9112920","url":null,"abstract":"The study on oil flow rate, pressure drop (pressure losses) behaviour of ester oil group (both natural and synthetic ester oil) due to its higher viscous nature is important for thermal designer during thermal design stage, since oil flow distribution within the winding has a direct impact on thermal performance of the transformer. During oil directed (OD) cooling modes, the static pressure drop over the continuous disc type of winding determines the ester oil split among low voltage windings (LV) and high voltage windings (HV) which is connected hydraulically in parallel. In addition, the oil flow distribution in disc type of transformer windings in conjunction with power loss (no-load and load loss) of transformer will decide the location and magnitude of the hotspot temperature in transformer. Hence, there is still a technical challenge with ester oil for transformer manufacturers and utilities to use in large rating power transformers mainly in OD cooling modes. In this paper, the effects of mineral oil and ester oil on frictional pressure, gravitational pressure, oil flow rate, velocity in cooling duct, temperature distributions in top and bottom insulation, main winding zones, core, radiators and coolers are investigated under OD cooling conditions. The typical transformer rating of 60/75/90MVA, 220/33kV is considered for thermal analysis. Since, natural ester oil and synthetic ester oil are potentially different in thermal properties, the thermal analysis results are compared with mineral oil. The thermal hydraulic network model (THNM model) are used for fast calculations of thermal parameters in typical large power transformer. The power losses distributions are calculated from FEM based simulations as an input for thermal analysis.","PeriodicalId":422853,"journal":{"name":"2020 IEEE 9th Power India International Conference (PIICON)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127932488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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