NDLI: Validity of circuit-based models for air-cored helical windings at high-frequency regimes

Content Provider	IET Digital Library
Author	Raman, Santosh Janaki Kumar, Udaya
Abstract	Helical coils in different forms find applications in various areas of electrical engineering. While power engineers use close-pitched coils in inductors, reactors and transformer windings, communication engineers use large-pitched helical coils as antennas. In classical power engineering, coils are represented as lumped inductors for power frequency applications and switch-over to distributed circuit models while dealing with switching and lightning transients. Even for very fast rising excitations such as very fast transient overvoltages, chopped lightning waves and propagation of partial discharge pulses, multi-conductor transmission-line-based models have been employed, which appears to be an over-simplification. It would be very useful if an upper-frequency limit for the circuit-based models is quantified, which requires an extensive solution of the electromagnetic fields. After realising the inherent late-time instability of marching-on-in-time methods, a relatively new method called the marching-on-in-degree-based scheme is adopted for the solution of the associated electric field integral equation. A deeper insight is first obtained by analysing the helical antennas. Subsequently, based on the extensive simulation results for the single-layer helical coils, an empirical relation relating the upper-frequency bound for the circuit-based modelling has been deduced.
Starting Page	1709
Ending Page	1717
Page Count	9
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 9, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.6456
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-12-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Air-cored Helical Windings Associated Electric Field Integral Equation Chopped Lightning Waves Circuit-based Model Circuit-based Modelling Coils Dielectric Breakdown And Discharges Distributed Circuit Model Electric Field Integral Equation Electromagnetic Field Helical Antenna High-frequency Regimes Inductor Inductors And Transformer Inherent Late-time Instability Integral Equation Large-pitched Helical Coils Lightning Lightning Transients Lumped Inductors Marching-on-in-degree-based Scheme Marching-on-in-time Method Multiconductor Transmission Line Multiconductor Transmission-line-based Model Network And Transmission Line Calculations Numerical Analysis Overvoltage Partial Discharge Pulses Partial Discharges Power Engineers Power Frequency Application Single Antenna Single-layer Helical Coils Transformer Windings Very Fast Rising Excitations Very Fast Transient Overvoltages
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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