Search query: differential rogowski current

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abstract: In the development of next generation power modules for electric vehicles, demands for high efficiency, reliability, low cost, high power density and therefore small size are of major importance. A promising approach is the embedding of power semiconductor devices into a printed circuit board (PCB) as investigated by the HI LEVEL project. This paper deals with the research, design and experimental verification of a current sensor based on the principle of a Rogowski coil, which is integrated into a PCB, so that it can measure the device current of the embedded power semiconductor devices. As switched mode currents are to be measured, the dynamics of the current sensor were of major concern. Moreover, as large voltage gradients caused by the semiconductor devices inject parasitic capacitive currents into the coil, a differential measurement approach was selected for cancelling out disturbances caused by capacitive coupling.
author_names: J N Fritz

Christoph Neeb

Rik W De Doncker
title: A PCB Integrated Differential Rogowski Coil for Non Intrusive Current Measurement Featuring High Bandwidth and dv/dt Immunity
year: 2015

abstract: Percentage Differential Protection (PDP) is well known as the main Unit Protection Relay of Power Transformer all over the world. The researchers suggested using a novel Current Transformer (CT) with a new approach for fault detections, to improve the characteristic of this relay. MATLAB Simulink tools software used to model the Rogowski Coil (RC) with the new PDP Relay characteristic. Reducing the min operating level point and expanding the operation region by revoking the second slope in the characteristic of the relay by implementing Extended Park's Vector Approach (EPVA) for faults detection. The paper also sheds light on removing the saturation error curve from the total error in the characteristic of PDP relay using the linear CT characteristics of Rogowski Coil. Consequently, a better sensitivity achieved specially for small differential currents in the secondary system. By this method, good indications of quitting few currents on primary terminal of power transformer were achieved. This performance of algorithm is due to the EPVA's analyzation which depends on spectrum analysis.
author_names: Ahmed Sherwani

Ali Kircay
title: Improving the Characteristic of Percentage Differential Relay of Power Transformer using Rogowski Coil with Extended Park's Vector Approach
venue: 2020 International Congress on Human Computer Interaction, Optimization and Robotic Applications (HORA)
year: 2020

abstract: This paper presents a simple method for improving the security and reliability of Harmonic Blocking Algorithms (HBAs) in differential protection of power transformers. In the proposed method, instead of using conventional Current Transformer (CT) Rogowski Coil Sensor (RCS) is utilized for sensing the transformer currents. Based on a theoretic analysis, it is shown that the use of RCS increases the margin between the second harmonic ratio levels of the energization and fault conditions, thereby increasing the HBAs security. Besides, the use of RCS has the additional advantage of eliminating the problem of CT saturation, which might cause malfunction of the differential relay. The validity of the proposed technique is demonstrated by evaluating extensive test cases in different operating conditions, which are recorded by digital simulations in PSCAD/EMTDC software. Overall, the results demonstrate that the proposed approach improves the security of HBAs by about 6.8%
author_names: Sepehr Karimi

Farshid Naseri

Ramin Qaedi

Ebrahim Farjah

Teymoor Ghanbari
title: Application of Rogowski Coil for Improving Security of Transformer Differential Protection
venue: 2020 28th Iranian Conference on Electrical Engineering (ICEE)
year: 2020

abstract: In this paper, a developed method for measuring power frequency ac current using Rogowski coil is presented. The proposed method uses a differentiator in order to reconstruct the current that is intended to be measured. This method gives accurate results as well as it requires only few samples to successfully reconstruct the power frequency current. These advantages are investigated by experimental testing using two different designs of Rogowski coil. The first Rogowski coil has a higher number of turns as compared with the second one. In addition, a digital signal processor is integrated with the coil to implement the proposed reconstruction method. The obtained results give an evidence for the proposed method validity as well as its efficacy.
author_names: Mohamed E Ibrahim

Amr M Abd-Elhady
title: Differential Reconstruction Method for Power Frequency AC Current Measurement Using Rogowski Coil
venue: IEEE Sensors Journal
year: 2016

abstract: Busbar protection grids are always important, but high speed regimes are now needed more than ever because many power systems operating in microgrid should achieve safe and stabile operation. For this purpose, protection concepts that require time coordination such as overcurrent relays and distance protection are no longer acceptable. Digital differential protection uses innovative algorithms to comply with the protection requirements busbar with fast times switching for all faults. The proposed scheme provides protection for any fault in the Busbar of the microgrid and isolates the smallest part possible, to allow the rest of the system to continue operating. The main difficulty in busbar protection using current transformer (CT) may appear during saturation. Therefore, with the use of the Rogowski coil current sensors (RC) can overcome the saturation in CT; in addition, it has many unique features. The protection system consists of a unique combination using differential protection using RC and an intelligent tool to achieve reliable busbar protection with a minimum of delay for evolving faults. Performance has been verified for a variety of operating conditions. The results have confirmed the superior performance of the protection solution. In general, Rogowski coils have performance characteristics that are favorable compared to conventional CTs.
author_names: Ali Hadi Abdulwahid

Shaorong Wang
title: A busbar differential protection based on fuzzy reasoning system and Rogowski coil current sensor for microgrid
venue: 2016 IEEE PES Asia Pacific Power and Energy Engineering Conference (APPEEC)
year: 2016

abstract: The Rogowski coil current sensor consists of a Rogowski coil and an integrator. The coil output voltage is proportional to the derivative of the primary current, and the integrator converts the differential into a normal state. Its advantages of good linearity and light weight are gaining more and more attention in the current sampling of smart grids and new electrical equipment, but Rogowski coils have different requirements in different application scenarios. In order to meet the practical needs of current measurement of parallel superconducting units in high temperature superconducting devices, a Rogowski coil can be designed and fabricated from use for cryogenic environments. The Rogowski coil bobbin is made of Fiber Reinforced Plastic (FRP) which has a small deformation in a cryogenic environment and can ensure the accuracy of current measurement. The experimental results show that the linearity of the Rogowski coil is well, and the linear scale factor of the normal temperature environment and the cryogenic environment is well, which can be used to measure the current of the superconducting parallel unit.
author_names: Shaoqun Cao

Jingye Zhang

Wenhan Zha

Chuang Zhao

Benkang Yang

Maxiang Zhu
title: Experimental Study on Current Measurement of Rogowski Coil in a Cryogenic Environment
venue: 2019 IEEE 3rd International Electrical and Energy Conference (CIEEC)
year: 2019

abstract: The invention discloses a PCB Rogowski coil current inductor based on differential wiring. The PCB Rogowski coil current inductor comprises a PCB (Printed Circuit Board) which is provided with a through hole, inner diameter guide hole pairs and out diameter guide hole pairs, wherein the inner diameter guide hole pairs and out diameter guide hole pairs are distributed around the center of a PCB coil and respectively include a pair of guide holes which are spaced with a preset distance and have equal distance from the center; the PCB is also provided with a common terminal via hole and a pair of differential wiring copper foils, wherein the common terminal via hole is positioned on the symmetrical line of one out diameter guide hole pair, the outer diameter guide holes of the out diameter guide hole pair respectively serve as the start point of a first differential copper foil wire and the end point of a second differential copper foil wire, the common terminal via hole serves as the start point and the end point of the first differential copper foil wire, and the first differential copper foil wire and the second differential copper foil wire sequentially pass through the inner diameter guide hole pairs and the outer diameter guide hole pairs to from two parallel coils. Since the differential wiring is adopted, the PCB Rogowski coil current inductor has strictly symmetrical signals and good antijamming capability.
title: PCB Rogowski coil current inductor based on differential wiring
year: 2014

abstract: High frequency power electronic converters having switching frequency higher than 1MHz require wideband, isolated and loss less current measurement for effective controls, diagnostics and prognostics. In this work, we propose a wideband and contactless current sensing method for isolated and loss less current measurement in high frequency power electronic converters. The proposed method combines two different sensing technologies a Magnetoresistor sensor and a differential Rogowski coil sensor, which have complementary characteristics to achieve a wide sensing bandwidth. We demonstrate through hardware prototypes and experiments that the proposed hybrid sensor yields to a very high sensing bandwidth of DC to 10MHz. The performance of the hybrid sensor is also evaluated in a 1MHz buck converter.
author_names: Shahriar Jalal Nibir

Sven Hauer

Mehrdad Biglarbegian

Babak Parkhideh
title: Wideband contactless current sensing using hybrid magnetoresistor Rogowski sensor in high frequency power electronic converters
venue: 2018 IEEE Applied Power Electronics Conference and Exposition (APEC)
year: 2018

abstract: Implementation of differential protection for transformers of electrical arc furnaces has some challenges because of the secondary high currents (about 100 kA) Conventional Current Transformers (CTs) cannot measure such high currents. Recently, differential protection has been implemented in these transformers using a special type of Rogowski Coil (RC) This report deals with a project of such implementation in Mobarakeh steel company, Isfahan, Iran. As the first report, design outputs of the project are presented.
author_names: Teymoor Ghanbari

Haidar Samet

Mohammad Amin Jarrahi

Darioush Daryabar
title: Implementation of Rogowski Coil Based Differential Protection on Electric Arc Furnace Transformers of Mobarakeh Steel Company: Design Step
venue: 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC I&CPS Europe)
year: 2018

abstract: Ben Fa Ming Gong Kai Liao Yi Chong Ji Yu Chai Fen Bu Xian De PCBLuo Shi Xian Quan Dian Liu Gan Ying Qi ,Bao Gua PCBBan ,PCBBan Shang Kai She You Tong Kong Nei Jing Dao Kong Dui He Wai Jing Dao Kong Dui ,Nei Jing Dao Kong Dui He Wai Jing Dao Kong Dui Yan PCBXian Quan De Yuan Xin Fen Bu ;Wai Jing Dao Kong Dui He Nei Jing Dao Kong Dui Jun Bao Gua Yi Dui Jian Ge Yu Ding Ju Chi Qie Ju Chi Yuan Xin Xiang Deng De Dao Kong ,PCBBan Shang Huan She Zhi You Yi Ge Gong Gong Duan Guo Kong He Yi Dui Chai Fen Bu Xian Tong Bo ,Gong Gong Duan Guo Kong Wei Yu Mou Yi Wai Jing Dao Kong Dui De Dui Cheng Xian Shang ,Gai Wai Jing Dao Kong Dui De Wai Jing Dao Kong Fen Bie Wei Di Yi Chai Fen Tong Bo Xian De Qi Dian Di Er Chai Fen Tong Bo Xian De Zhong Dian ;Gong Gong Duan Guo Kong Wei Di Yi Chai Fen Tong Bo Xian De Qi Dian Ji Di Yi Chai Fen Tong Bo Xian De Zhong Dian ;Di Yi Chai Fen Tong Bo Xian He Di Er Chai Fen Tong Bo Xian Yi Ci Chuan Guo Nei Jing Dao Kong Dui He Wai Jing Dao Dui Xing Cheng Liang Ge Ping Xing De Xian Quan Ben Fa Ming You Yu Cai Yong Liao Chai Fen Bu Xian ,Chai Fen Xin Hao Yan Ge Dui Cheng ,You Hen Hao De Kang Gan Rao Neng Li
title: Based on the differential wirings pcb Rogowski coil current sensors
year: 2014