DESIGN AND TEST OF A NEW HIGH-CURRENT ELECTRONIC CURRENT TRANSFORMER WITH A ROGOWSKI COIL

2014 ◽  
Vol 21 (1) ◽  
pp. 121-132 ◽  
Author(s):  
Ming Zhang ◽  
Kaicheng Li ◽  
Shunfan He ◽  
Jun Wang
Keyword(s):  
Dynamic Range ◽  
Partial Evaluation ◽  
Current Transformer ◽  
Rogowski Coil ◽  
High Current ◽  
Current Transformers ◽  
Electronic Current Transformer ◽  
Electronic Current ◽  
Electro Magnetic ◽  
Electronic Current Transformers

Abstract This paper describes the design and test of a new high-current electronic current transformer based on a Rogowski coil. For better performances, electronic current transformers are used to replace conventional electro-magnetic inductive current transformers based on ferromagnetic cores and windings to measure high-current on the high voltage distribution grids. The design of a new high-current electronic current transformer is described in this paper. The principal schemes of the prototype and partial evaluation results are presented. Through relative tests it is known that the prototype has a wide dynamic range and frequency band, and it can allow high accuracy measurements.

Design and Analysis of PCB Rogowski Coil Current Transformer

2014 ◽  
Vol 672-674 ◽  
pp. 984-988
Author(s):  
Biao Su ◽  
Li Xue Li ◽  
Yi Hui Zheng ◽  
Xin Wang ◽  
Yan Liu ◽  
...  
Keyword(s):  
Power System ◽  
High Sensitivity ◽  
Current Transformer ◽  
Rogowski Coil ◽  
Electromagnetic Current ◽  
Current Transformers ◽  
Coil Current ◽  
Electronic Current ◽  
Rogowski Coils ◽  
Electronic Current Transformers

Electronic current transformers are more suitable for the development of power system compared with traditional electromagnetic current transformers. Rogowski coil current transformer is one of three electric current transformers. According to the measurement principle of Rogowski coils, the equivalent circuit of PCB Rogowski coils is analyzed. By using four PCB Rogowski coils combined, a PCB Rogowski coil current transformer is designed and tested. The results show that the designed PCB Rogowski coil transformer has good linearity and high sensitivity and measurement accuracy and it can meet the requirement of power system.

An Innovative Electronic Current Transformer Applied in High Voltage Systems

2011 ◽  
Vol 301-303 ◽  
pp. 1471-1476 ◽  
Author(s):  
Zheng Qi Tian ◽  
Zhen Hua Li ◽  
Yue Tong
Keyword(s):  
Current Transformer ◽  
High Price ◽  
Test Results ◽  
Paper Test ◽  
Current Transformers ◽  
Integration Algorithm ◽  
Electronic Current Transformer ◽  
Electronic Current ◽  
Power Frequency ◽  
Electronic Current Transformers

With the development of power system, Conventional current transformers (CTs) show a growing number of shortcomings. For better performances, Electronic Current Transformers (ECTs) are researched to replace CT. But high price, unsatisfactory life and unpredictable reliability hold back their industrializations. Employing the insulation structure of traditional inverted SF6transformers and the new sensing principle at the same time, using high-precision digital integration algorithm which has higher precision to extracting the power frequency signal, an innovative electronic current transformer is introduced in this paper. Test results show that the transformer has high accuracy, low price, good stability, wide frequency response and long life.

An On-Site Calibration System for Electronic Instrument Transformers Based on Labview

2014 ◽  
Vol 21 (2) ◽  
pp. 257-270 ◽  
Author(s):  
Ming Zhang ◽  
Kaicheng Li ◽  
Jun Wang ◽  
Shunfan He
Keyword(s):  
Dynamic Range ◽  
Current Transformer ◽  
Data Synchronization ◽  
Electronic Instrument ◽  
Calibration System ◽  
Adaptive Communication ◽  
Electronic Current ◽  
Instrument Transformers ◽  
Error Correction Algorithm ◽  
Electronic Current Transformers

Abstract Electronic voltage transformers (EVT) and electronic current transformers (ECT) are important instruments in a digital substation. For simple, rapid and convenient development, the paper proposed an on-site calibration system for electronic instrument transformers based on LabVIEW. In the system, analog signal sampling precision and dynamic range are guaranteed by the Agilent 3458A digital multimeter, and data synchronization is also achieved based on a self-developed PCI synchronization card. To improve the measurement accuracy, an error correction algorithm based on the Hanning window interpolation FFT has good suppression of frequency fluctuation and inter-harmonics interference. The human-computer interface and analysis algorithm are designed based on LabVIEW, and the adaptive communication technology is designed based on IEC61850 9-1/2. The calibration system can take into account pairs of digital output and analog output of the electronic voltage/current transformer calibration. The results of system tests show that the calibration system can meet the requirements of 0.2 class calibration accuracy, and the actual type test and on-site calibration also show that the system is easy to operate with convenience and satisfactory stability.

Electromagnetic Parameters Extraction of Electronic Current Transformer Based on Finite Element Modeling

2014 ◽  
Vol 1070-1072 ◽  
pp. 1085-1091
Author(s):  
Xiao Bin Liang ◽  
Fan Tang ◽  
Jie Wu ◽  
Wei Zhen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electromagnetic Coupling ◽  
Current Transformer ◽  
Rogowski Coil ◽  
Electromagnetic Parameters ◽  
Correct Operation ◽  
Electronic Current Transformer ◽  
Electronic Current ◽  
Element Method

Electronic current transformer is one of the key equipment of intelligent substation and has a direct impact to the correct operation of relay protection devices. In order to accurately establish the dynamic response model of electronic current transformer, it is needed to extract electromagnetic parameters of Rogowski coil, which is the electromagnetic coupling part of electronic current transformer. This paper builds the electromagnetic parameters model and extracts the electromagnetic distribution parameters of Rogowski coil based on the finite element method, then we use the equivalent method to calculate the lumped electromagnetic parameter. At last, comparing with the experimental results, a good accuracy of the simulation results based on finite element method is presented.

A Nonlinear Compensation Approach for the Iron-Core Coils Based Electronic Current Transformers

2011 ◽  
Vol 383-390 ◽  
pp. 4371-4376
Author(s):  
Yue Xie ◽  
Li Qing Shen ◽  
Jing Chen
Keyword(s):  
Electrical Measuring ◽  
Nonlinear Behavior ◽  
Current Transformer ◽  
Iron Core ◽  
Current Transformers ◽  
Electronic Current ◽  
Nonlinear Compensation ◽  
Compensation Approach ◽  
Electronic Current Transformers ◽  
Hardware Circuit

Iron-Core coils based electronic current transformer is often used with electrical measuring instrumnts and meters. However, the iron-core coils used as the primary current sensor have nonlinear behavior, and its magnetizing current can be considered as the main error source. Therefore, a nonlinear compensation approach for the iron-core coils based electronic current transformers is proposed in this paper. The approach depends on a linear hardware circuit and a nonlinear numeric control law. Theoretical analysis and experimental results have verified the correctness of the proposed method.

scholarly journals Application Analysis of AD8479 in the Acquisition Unit of Electronic Current Transformer

2018 ◽  
Vol 160 ◽  
pp. 01002
Author(s):  
Xi Liu ◽  
Jianhua Yang ◽  
Bifu Qian ◽  
Lei Zhang
Keyword(s):  
Theoretical Analysis ◽  
Electromagnetic Interference ◽  
Circuit Breaker ◽  
Current Transformer ◽  
Rogowski Coil ◽  
Electronic Current Transformer ◽  
Common Mode Voltage ◽  
The Poor ◽  
Electronic Current ◽  
Application Analysis

Electronic current transformer acquisition unit was installed outdoors and near the circuit breaker. The poor environments, including high common mode voltage, electromagnetic interference and other factors were a serious of disadvantages impacts on the acquisition unit. The paper introduced the parameter characteristics and functions of Rogowski coil, the differential amplifier chip AD8479, and filter circuit in detail. The application circuit was designed based on proper parameters. Lastly, the interference was inhibited effectively, and the electronic current transformer acquisition unit run more reliably resulted from theoretical analysis and field test.

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