Utilizing Rogowski coil for saturation detection and compensation in iron core current transformer

2017 ◽  
Author(s):  
Alireza Bagheri ◽  
Mahdi Allahbakhshi ◽  
Donya Behi ◽  
Mohsen Tajdinian
Keyword(s):  
Current Transformer ◽  
Rogowski Coil ◽  
Iron Core ◽  
Core Current

Research on PCB Rogowski Current Transformer Based on AD7742

2014 ◽  
Vol 981 ◽  
pp. 589-593
Author(s):  
Xin Lao Wei ◽  
Bo Zhu ◽  
Bing Pang ◽  
Tong Liu ◽  
Song Wang ◽  
...  
Keyword(s):  
Current Transformer ◽  
High Accuracy ◽  
Rogowski Coil ◽  
Magnetic Saturation ◽  
Iron Core ◽  
Measuring Range ◽  
Digital Integrator ◽  
Saturation Phenomenon ◽  
Good Linearity ◽  
Rogowski Coils

Rogowski coils is a kind of special structure hollow coils, it has good linearity, no iron core, no magnetic saturation phenomenon and wide measuring range, which has been used to measure all kinds of various changes current. The current transformer consist of PCB Rogowski coil and digital integrator has been designed, includes the structure of PCB Rogowski coils and the principle digital integrator based on AD7742. The test of PCB current transformer show that it has high accuracy and PCB coils has good linearity. It can meet the requirement of current measurement.

scholarly journals Reach and Operating Time Correction of Digital Distance Relay

2017 ◽  
Vol 7 (1) ◽  
pp. 58
Author(s):  
A N Sarwade ◽  
P K Katti ◽  
J G Ghodekar
Keyword(s):  
Low Voltage ◽  
Electrical Power ◽  
Operating Time ◽  
Current Transformer ◽  
Iron Core ◽  
Electrical Power System ◽  
Voltage Transformer ◽  
Distance Relay ◽  
Correct Operation ◽  
Secondary Current

Current and voltage signals recieved from conventional iron core Current Transformer (CT) and Voltage Transformer plays very important role for correct operation of Distance Distance Relay (DDR). Increase in secondary burden connected to CT causes it to saturate at earlier stage. The saturated CT produces distorted secondary current, causing DDR to under reach and to operate by certain time delay. Rogowski Coils (RCs) are attaining increased acceptance and use in electrical power system due to their inherent linearity, greater accuracy and wide operating current range. This paper presents use of RC as an advanced measurement device suitable for DDR. Case study for validation of use of RC is carried out on low voltage system. The simulation results of Distance protection scheme used for protection of part of 220kV AC system shows excellent performance of RC over CT under abnormal conditions.

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.

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.

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