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.

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.

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.

scholarly journals Electromagnetic Disturbed Mechanism of Electronic Current Transformer Acquisition Card under High Frequency Electromagnetic Interference

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1293
Author(s):  
Guanchen Liu ◽  
Peng Zhao ◽  
Mingmin Zhao ◽  
Zhichao Yang ◽  
Henglin Chen
Keyword(s):  
Electromagnetic Interference ◽  
High Frequency ◽  
Smart Grids ◽  
Coupling Model ◽  
Current Transformer ◽  
Operating Conditions ◽  
Coupling Mechanism ◽  
Electromagnetic Environment ◽  
Electronic Current Transformer ◽  
Electronic Current

The electronic current transformer (ECT) acquisition card is widely used in smart grids with many advantages. However, with the continuous improvement of the power grid and localized intelligent electronic devices, the electromagnetic environment under the operating conditions of gas insulated switchgear (GIS) substations is becoming more complicated. The reliability and safety of the ECT acquisition card will be endangered due to the complicated electromagnetic environment. In order to solve these problems, this paper investigates the electromagnetic disturbed mechanism of the ECT acquisition card. The effects of different grounding methods on the electromagnetic interference of the ECT acquisition card were studied. A platform based on IEC 61000-4-4 was built, and the electromagnetic interference (EMI) of the ECT acquisition card with different grounding methods was measured. The results show that the lower grounding impedance of the ECT acquisition system increased the internal EMI. Further, the high frequency electrical fast transient/burst coupling mechanism was analyzed. The parasitic parameters of the acquisition card were extracted based on the critical circuit by using the finite element method. Then, the high-frequency EMI coupling model of the ECT acquisition card was established.

scholarly journals A Study to Resist Conduced Interference from GIS Bus-Charging Currents Switching for Electronic Current Transformer

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 957
Author(s):  
Shijun Bai ◽  
Fanding Yue ◽  
Lincui Zeng ◽  
Yi Li ◽  
Chuanchuan Wang ◽  
...  
Keyword(s):  
Simulation Model ◽  
Experimental Research ◽  
High Voltage ◽  
High Frequency ◽  
Current Transformer ◽  
Rogowski Coil ◽  
First Order ◽  
Electronic Current Transformer ◽  
Electronic Current ◽  
Input Source

In this paper, we study the conducted interference to an electronic current transformer introduced in the process of bus-charging currents which are caused by switching a gas insulated switchgear (GIS) disconnector. To cope with these issues, the EMTP-ATP and Matlab/Simulink software are used to carry out equivalent modeling simulations and experimental research, respectively. More specifically, the very fast transient current generated by disconnector switching (DS) is used as the input source of the equivalent simulation model of the Rogowski coil, and the characteristics of conducted interference waveforms of the Rogowski coil, the active integrator and filter outputs under single and multiple breakdowns are analyzed step by step. Moreover, several anti-interference methods are proposed to improve the resistance to the high-voltage and high-frequency conducted interference for the Rogowski coil, such as reducing the Rogowski cut-off frequency, increasing the transient voltage suppressor (TVS), active filter, and Cy capacitor. Besides, the study also reveals that the residual charge of the integral capacitor will discharge with a time constant τ = 1 s after arc quenching with the first-order discharge circuit, which is composed of the feedback resistance and the integral capacitor C. Lastly, the experimental results demonstrate the correctness of the modeling method proposed in this paper and the effectiveness of anti-interference measures.

Sign in / Sign up

Export Citation Format

Share Document