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Abstract
A novel approach to the modeling of subnanosecond partial discharge (PD) phenomena in high voltage cables is presented to illustrate the capabilities of the finitedifference timedomain (FDTD) simulation method for modeling transients and their effects measured at a distance. FDTD modeling computes the threedimensional electric and magnetic fields throughout the simulation volume. This numerically intensive process has the advantage that timevarying 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 timedomain waveform defined using digitally sampled data from an actual PD current pulse measurement. High frequency current transformers (HFCTs) are commonly used for onsite 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 EPRinsulated cable sample. Examples are also given in which the FDTD software is used to model timedomain 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 language  English 

Title of host publication  Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC 
Editors  Frank Hegeler 
Publisher  IEEE 
Pages  256259 
Number of pages  4 
ISBN (Print)  9781467312226 
DOIs  
Publication status  Published  Jun 2012 
Event  IEEE International Power Modulator and High Voltage Conference (2012)  San Diego, United States Duration: 3 Jun 2012 → 7 Jun 2012 
Conference
Conference  IEEE International Power Modulator and High Voltage Conference (2012) 

Country  United States 
City  San Diego 
Period  3/06/12 → 7/06/12 
Keywords
 high voltage cables
 FDTD modeling
 power modulation
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Dive into the research topics of 'FDTD modeling of fast transient currents in high voltage cables'. Together they form a unique fingerprint.Projects
 1 Finished

KNOWLEDGE DISCOVERY FROM ONLINE CABLE CONDITION MONITORING SYSTEMS  INSULATION DEGRADATION AND AGING DIAGNOSTICS
Judd, M. & Siew, W. H.
EPSRC (Engineering and Physical Sciences Research Council)
1/06/09 → 30/09/14
Project: Research