Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2005.07a
- /
- Pages.96-98
- /
- 2005
A Compensated Current Acqaisition Device for CT Saturation
왜곡 전류 보상형 전류 취득 장치
- Ryu, Ki-Chan (Myongji University Next-Generation Power Technology Center) ;
- Gang, Soo-Young (Myongji University Next-Generation Power Technology Center) ;
- Kang, Sang-Hee (Myongji University Next-Generation Power Technology Center)
- Published : 2005.07.18
Abstract
In this paper, an algorithm to compensate the distorted signals due to Current Transformer(CT) saturation is suggested, First, DWT which can be easily realized by filter banks in real-time applications is used to detect a start point and an end point of the saturation. Secondly, For enough Datas those need to use the least-square curve fitting method, the distorted current signal is compensated by the AR(autoregressive) model using the data during the previous healthy section until pick point of Saturation. Thirdly, the least-square curve fitting method is used to restore the distorted section of the secondary current. Finaly, this algorithm had a Hadware test using DSP board(TMS320C32) with Doble test device. DWT has superior detection accuracy and the proposed compensation algorithm which shows very stable features under various levels of remanent flux in the CT core is also satisfactory. And this algorithm is more correct than a previous algorithm which is only using the LSQ fitting method. Also it can be used as a MU involving the compensation function that acquires the second data from CT and PT.