• Title, Summary, Keyword: Multi-Conductor Transmission Line (MTL)

Search Result 6, Processing Time 0.032 seconds

Transformer Winding Modeling based on Multi-Conductor Transmission Line Model for Partial Discharge Study

  • Hosseini, Seyed Mohammad Hassan;Baravati, Peyman Rezaei
    • Journal of Electrical Engineering and Technology
    • /
    • v.9 no.1
    • /
    • pp.154-161
    • /
    • 2014
  • To study and locate partial discharge(PD) and analyze the transient state of power transformer, there is a need for a high frequency model of transformer winding and calculation of its parameters. Due to the high frequency nature of partial discharge phenomenon, there is a need for an accurate model for this frequency range. To attain this goal, a Multi-Conductor Transmission Line (MTL) model is used in this paper for modeling this transformer winding. In order that the MTL model can properly simulate the transformer behavior within a frequency range it is required that its parameters be accurately calculated. In this paper, all the basic parameters of this model are calculated by the use of Finite Element Method (FEM) for a 20kV winding of a distribution transformer. The comparison of the results obtained from this model with the obtained shape of the waves by the application of PD pulse to the winding in laboratory environment shows the validity and accuracy of this model.

Investigation of Electromagnetic Field Coupling with Twisted Conducting Line by Expanded Chain Matrix

  • Cho, Yong-Sun;Ro, Jong-Suk;Chung, Yong-Seek;Cheon, Changyul;Jung, Hyun-Kyo
    • Journal of Electrical Engineering and Technology
    • /
    • v.8 no.2
    • /
    • pp.364-370
    • /
    • 2013
  • In the current paper, we propose a new modeling algorithm to analyze the coupling between an incident electromagnetic field (EMF) and a twisted conducting line, which is a kind of non-uniform line. Typically, analysis of external field coupling to a uniform transmission line (TL) is implemented by the Baum-Liu-Tesche (BLT) equation so that the induced load responses can be obtained. However, it is difficult to apply this method to the analysis of a twisted conducting line. To overcome this limitation, we used a chain matrix composed of ABCD parameters. The proposed algorithm expands the dimension of the previous chain matrix to consider the EMF coupling effectiveness of each twisted pair, which is then applied to multi-conductor transmission line (MTL) theory. In addition, we included a comparative study that involves the results of each method applied in the conventional BLT equation and new proposed algorithm in the uniform two-wire TL case to verify the proposed method.

Analysis of Shielded Twisted Pair Cable to External Field Coupling by Expanded Chain Matrix Modeling

  • Cho, Yong-Sun;Jung, Hyun-Kyo;Cheon, Changyul;Chung, Young-Seek
    • Journal of Electrical Engineering and Technology
    • /
    • v.9 no.6
    • /
    • pp.2049-2057
    • /
    • 2014
  • In this paper, a numerical method for analyzing coupling between high-altitude electromagnetic pulse (HEMP) as external field and a shielded twisted pair (STP) cable is proposed, which is based on an expanded chain matrix. Load responses of electromagnetic (EM) field excitation in uniform transmission line (TL) are solved by Baum-Liu-Tesche (BLT) equations in frequency domain, however, it is difficult to apply BLT equations to solve load responses of STP cable because the iteratively changing configuration of each twisted pairs are involved in cable. To avoid this problem and decrease memory and CPU time, we proposed the expanded chain matrix modeling method that is calculated using ABCD parameters, and applied multi-conductor transmission line (MTL) theory to consider the EMP coupling effectiveness of each twisted pairs. The results implemented by the proposed method are presented and compared with those obtained by the finite-difference time domain (FDTD) method as a kind of 3D full wave analysis.

Comparison of High Frequency Detailed Generator Models for Partial Discharge Localization

  • Hassan Hosseini, S.M.;Hosseini Bafghi, S.M.
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.4
    • /
    • pp.1752-1758
    • /
    • 2015
  • This paper presents partial discharge localization in stator winding of generators using multi-conductor transmission line (MTL) and RLC ladder network models. The high-voltage (HV) winding of a 6kV/250kW generator has been modeled by MATLAB software. The simulation results of the MTL and the RLC ladder network models have been evaluated with the measurements results in the frequency domain by applying of the Pearson’s correlation coefficients. Two PD generated calibrator signals in kHz and MHz frequency range were injected into different points of generator winding and the signals simulated/measured at the both ends of the winding. For partial discharge localization in stator winding of generators is necessary to calculate the frequency spectrum of the PD current signals and then estimate the poles of the system from the calculated frequency spectrum. Finally, the location of PD can be estimated. This theory applied for the above generator and the simulation/measured results show the good correlation for PD Location for RLC ladder network and MTL models in the frequency range of kHz (10kHz<f<1MHz) and MHz (1MHz<f<5MHz) respectively.

An Analysis of the Crosstalk Characteristic for Pulse on the Multi-Transmission Lines using FDTD (유한차분 시간영역 해석법을 이용한 다중 전송 선로에서 펄스 신호의 누화특성 해석)

  • Kim, Gi-Rae;Lee, Young-Chul
    • Journal of the Korean Institute of Telematics and Electronics D
    • /
    • v.36D no.1
    • /
    • pp.1-7
    • /
    • 1999
  • In this paper, we use the FDTD method to analyze crosstalk characteristics for high speed pulse signal on MTL(Multi-Transmission Line) in time domain. The FDTD results are compared to the results of SPICE modeling method and the experimental result. The FDTD method has higher accuracy of results than other methods, and it can analyze transmission characteristics of MTL regard to loss of conductor. We analyze crosstalk characteristics for pulse on MTL for lossless and loss case.

  • PDF

Partial Discharge Localization Based on Detailed Models of Transformer and Wavelet Transform Techniques

  • Hassan Hosseini, Seyed Mohammad;Rezaei Baravati, Peyman
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.3
    • /
    • pp.1093-1101
    • /
    • 2015
  • Partial Discharge (PD) is a physical phenomenon, which causes defects and damages to the insulation. This phenomenon is regarded as the most important source of fault and defect in power transformers. Therefore, methods of high speed and precision are considered of special importance for the maintenance of transformers in localization of the origin of partial discharge. In this paper, the transformer winding is first modeled in a transient state by using RLC ladder network and multiconductor transmission line (MTL) models. The parameters of the two models were calculated by Ansoft Maxwell software, and the simulations were performed by Matlab software. Then, the PD pulses were applied to the models with different widths of pulses. With regard to the fact that the signals received after the application of PD had a variable frequency nature over time, and based on the wavelet transform and signal energy, a new method was presented for the localization of PD. Ultimately; the mentioned method was implemented on a 20 kV winding distribution transformer. Then, the performances of the models used in this paper, including RLC and MTL models, were compared in different frequency bands for the correct distinction of partial discharge location.