FDTD modeling of fast transient currents In high voltage cables

X. Hu, A.J. Reid, W.H. Siew, M.D. Judd

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    A novel approach to the modeling of sub-nanosecond partial discharge (PD) phenomena in high voltage cables is presented to illustrate the capabilities of the finite-difference time-domain (FDTD) simulation method for modeling transients and their effects measured at a distance. FDTD modeling computes the three-dimensional electric and magnetic fields throughout the simulation volume. This numerically intensive process has the advantage that time-varying quantities such as voltages and conducted currents can be recorded at any position within the model. For modeling PDs in cables, a current source is introduced within the insulating medium and its time-domain waveform defined using digitally sampled data from an actual PD current pulse measurement. High frequency current transformers (HFCTs) are commonly used for on-site detection and location of PD in HV distribution cables. The HFCT itself cannot be modeled directly using FDTD because its geometrical detail is too small for the FDTD mesh. However, a hybrid model can be implemented by recording magnetic field values on path enclosing a conductor, applying Ampere's circuital law to determine the PD current and applying the responses of real HFCTs that have been characterized experimentally. The method for simulating localized insulation breakdown is presented, showing how this can be used to launch a PD pulse into a cable model and predict the output response of an HFCT some distance away. This process is illustrated through a parametric study of variations in the PD source parameters and by comparison of the data with the measured propagation properties of PD signals in an 11 kV EPR-insulated cable sample. Examples are also given in which the FDTD software is used to model time-domain reflectometry measurements that can be useful for locating damage within the same type of HV cable. Similar techniques could be applied to much larger insulation breakdown currents, for example, in gas switches.
    Original languageEnglish
    Title of host publicationProceedings of the 2012 IEEE International Power Modulator and High Voltage Conference
    PublisherIEEE
    Pages260-263
    Number of pages4
    ISBN (Electronic)978-1-4673-1225-7
    ISBN (Print)978-1-4673-1222-6
    DOIs
    Publication statusPublished - Jun 2012

    Fingerprint

    Partial discharges
    Cables
    Electric instrument transformers
    Electric potential
    Insulation
    Magnetic fields
    Paramagnetic resonance
    Switches
    Electric fields
    Gases

    Keywords

    • transfer functions
    • partial discharge
    • FDTD
    • power cable
    • HFCT

    Cite this

    Hu, X., Reid, A. J., Siew, W. H., & Judd, M. D. (2012). FDTD modeling of fast transient currents In high voltage cables. In Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference (pp. 260-263). IEEE. https://doi.org/10.1109/IPMHVC.2012.6518729
    Hu, X. ; Reid, A.J. ; Siew, W.H. ; Judd, M.D. / FDTD modeling of fast transient currents In high voltage cables. Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference . IEEE, 2012. pp. 260-263
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    abstract = "A novel approach to the modeling of sub-nanosecond partial discharge (PD) phenomena in high voltage cables is presented to illustrate the capabilities of the finite-difference time-domain (FDTD) simulation method for modeling transients and their effects measured at a distance. FDTD modeling computes the three-dimensional electric and magnetic fields throughout the simulation volume. This numerically intensive process has the advantage that time-varying quantities such as voltages and conducted currents can be recorded at any position within the model. For modeling PDs in cables, a current source is introduced within the insulating medium and its time-domain waveform defined using digitally sampled data from an actual PD current pulse measurement. High frequency current transformers (HFCTs) are commonly used for on-site detection and location of PD in HV distribution cables. The HFCT itself cannot be modeled directly using FDTD because its geometrical detail is too small for the FDTD mesh. However, a hybrid model can be implemented by recording magnetic field values on path enclosing a conductor, applying Ampere's circuital law to determine the PD current and applying the responses of real HFCTs that have been characterized experimentally. The method for simulating localized insulation breakdown is presented, showing how this can be used to launch a PD pulse into a cable model and predict the output response of an HFCT some distance away. This process is illustrated through a parametric study of variations in the PD source parameters and by comparison of the data with the measured propagation properties of PD signals in an 11 kV EPR-insulated cable sample. Examples are also given in which the FDTD software is used to model time-domain reflectometry measurements that can be useful for locating damage within the same type of HV cable. Similar techniques could be applied to much larger insulation breakdown currents, for example, in gas switches.",
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    Hu, X, Reid, AJ, Siew, WH & Judd, MD 2012, FDTD modeling of fast transient currents In high voltage cables. in Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference . IEEE, pp. 260-263. https://doi.org/10.1109/IPMHVC.2012.6518729

    FDTD modeling of fast transient currents In high voltage cables. / Hu, X.; Reid, A.J.; Siew, W.H.; Judd, M.D.

    Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference . IEEE, 2012. p. 260-263.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    AU - Reid, A.J.

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    N2 - A novel approach to the modeling of sub-nanosecond partial discharge (PD) phenomena in high voltage cables is presented to illustrate the capabilities of the finite-difference time-domain (FDTD) simulation method for modeling transients and their effects measured at a distance. FDTD modeling computes the three-dimensional electric and magnetic fields throughout the simulation volume. This numerically intensive process has the advantage that time-varying quantities such as voltages and conducted currents can be recorded at any position within the model. For modeling PDs in cables, a current source is introduced within the insulating medium and its time-domain waveform defined using digitally sampled data from an actual PD current pulse measurement. High frequency current transformers (HFCTs) are commonly used for on-site detection and location of PD in HV distribution cables. The HFCT itself cannot be modeled directly using FDTD because its geometrical detail is too small for the FDTD mesh. However, a hybrid model can be implemented by recording magnetic field values on path enclosing a conductor, applying Ampere's circuital law to determine the PD current and applying the responses of real HFCTs that have been characterized experimentally. The method for simulating localized insulation breakdown is presented, showing how this can be used to launch a PD pulse into a cable model and predict the output response of an HFCT some distance away. This process is illustrated through a parametric study of variations in the PD source parameters and by comparison of the data with the measured propagation properties of PD signals in an 11 kV EPR-insulated cable sample. Examples are also given in which the FDTD software is used to model time-domain reflectometry measurements that can be useful for locating damage within the same type of HV cable. Similar techniques could be applied to much larger insulation breakdown currents, for example, in gas switches.

    AB - A novel approach to the modeling of sub-nanosecond partial discharge (PD) phenomena in high voltage cables is presented to illustrate the capabilities of the finite-difference time-domain (FDTD) simulation method for modeling transients and their effects measured at a distance. FDTD modeling computes the three-dimensional electric and magnetic fields throughout the simulation volume. This numerically intensive process has the advantage that time-varying quantities such as voltages and conducted currents can be recorded at any position within the model. For modeling PDs in cables, a current source is introduced within the insulating medium and its time-domain waveform defined using digitally sampled data from an actual PD current pulse measurement. High frequency current transformers (HFCTs) are commonly used for on-site detection and location of PD in HV distribution cables. The HFCT itself cannot be modeled directly using FDTD because its geometrical detail is too small for the FDTD mesh. However, a hybrid model can be implemented by recording magnetic field values on path enclosing a conductor, applying Ampere's circuital law to determine the PD current and applying the responses of real HFCTs that have been characterized experimentally. The method for simulating localized insulation breakdown is presented, showing how this can be used to launch a PD pulse into a cable model and predict the output response of an HFCT some distance away. This process is illustrated through a parametric study of variations in the PD source parameters and by comparison of the data with the measured propagation properties of PD signals in an 11 kV EPR-insulated cable sample. Examples are also given in which the FDTD software is used to model time-domain reflectometry measurements that can be useful for locating damage within the same type of HV cable. Similar techniques could be applied to much larger insulation breakdown currents, for example, in gas switches.

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    BT - Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference

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    Hu X, Reid AJ, Siew WH, Judd MD. FDTD modeling of fast transient currents In high voltage cables. In Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference . IEEE. 2012. p. 260-263 https://doi.org/10.1109/IPMHVC.2012.6518729