Title :
A CT Centered on Rogowski Coil Applied for Low-Frequency Heavy Current Measurement
Author :
Weibo, Li ; Hong, He ; Jin, Rao ; Mingyuan, Zhang ; Minzhong, Ma
Author_Institution :
Nat. Key Lab. for Vessel Integrated Power Syst. Technol., Naval Univ. of Eng., Wuhan, China
Abstract :
A current transformer (CT) system centered on Rogowski coil is introduced to measure the low frequency heavy current of the linear induction motor (LIM) powered by the H-bridge sine pulse width modulation (SPWM) inverter. The frequency of the output current of the inverter ranges from 1 hertz to 200 hertz. The current test apparatus is made of the sensor head of Rogowski coil and the post-processing circuit. The post-processing circuit has characteristics of high reliability, high accuracy, low saturation, and low distortion. The voltage from the processing circuit is acquired by the Nicolet acquisition system, which has a fast speed of analyzing the current in real time. The fundamental current can be gained by means of the Fourier transformation. Both theory analysis and experimental results can verify the feasibility of the proposed CT instrumentation.
Keywords :
Fourier transforms; PWM invertors; coils; current transformers; electric current measurement; linear induction motors; CT instrumentation; CT system; Fourier transformation; H- bridge sine pulse width modulation inverter; Nicolet acquisition system; Rogowski coil; SPWM inverter; current transformer; linear induction motor; low-frequency heavy-current measurement; Coils; Current measurement; Current transformers; Frequency measurement; Induction motors; Instruments; Inverters; Rogowski coil; heavy current; low frequency; low saturation; post-processing circuit;
Conference_Titel :
Electrical and Control Engineering (ICECE), 2010 International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6880-5
DOI :
10.1109/iCECE.2010.15
