Electric fields and electrical insulation

McAllister, I.W.

doi:10.1109/tdei.2002.1038656

Cited by 34 publications

(11 citation statements)

References 66 publications

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“…The input transfer function of the measurement system, and therefore the resolution are greatly affected by shape and position of the electrostatic voltmeter [13]. Effects on resolution in the overall measurement systems per each parameter are evaluated using an electrostatic voltmeter model with the structure in Fig.…”

Section: A Effect Of Different Parameters On Resolutionmentioning

confidence: 99%

Measurement Methods of Accumulated Electric Charges on Spacer in Gas Insulated Switchgear

Okabe

Kumada²

2007

IEEE Trans. Power Delivery

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The phenomenon of accumulated charges on a solid insulator material surface is one of critical parameters at the insulation design stage for ac electric power equipment as well as dc equipment. Therefore, it is important to grasp charge amounts on an insulator surface with an appropriate resolution. Over the last few years, researchers have made tremendous progress on this subject, but reports are rather academic and not always easy for electric power engineers to understand and apply practically. This paper explains latest measurement methods plainly starting with the basic principle of the measurement, supposing mainly gas insulated switchgear (GIS) engineers. It includes inverse-problem-solving as signal processing technique, resolution evaluation from the standpoint of system geometry, sample frequency, and noise. Further, effects of various parameters on the resolution and also preferable measurement systems for, e.g., 500 kV actual GIS spacers are treated.Index Terms-Dual layer charge, electric charge measurement, inverse calculation processing technique, preferable measurement system, resolution, shift invariant.

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Section: A Effect Of Different Parameters On Resolutionmentioning

confidence: 99%

Measurement Methods of Accumulated Electric Charges on Spacer in Gas Insulated Switchgear

Okabe

Kumada²

2007

IEEE Trans. Power Delivery

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“…Methods based on field theoretical approach were reviewed in [3], which indicated its advantages in the analysis of electrical insulation problems. However, the electric field evaluation of a practical insulator is so complex that an analytical method is very difficult, if not possible, to compute the exact solutions.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Disc Insulator Type and Corona Ring Effect on Electric Field Distribution over 230-kV Insulator Strings

Akbari

Mirzaie

Rahimnejad

et al. 2012

IJET

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Insulator strings are widely used in power systems for the dual task of mechanically supporting and electrically isolating the live phase conductors from the support tower. However, the electric field and voltage distribution of insulator string is uneven which may easily lead to corona, insulators' surface deterioration and even flashover. So the calculation of the electric field and voltage distribution along them is a very important factor in the operation time. Besides, despite the variety of insulator material and profiles, no remarkable endeavor regarding their impacts upon electric field distribution has been made so far. In this paper, three-dimensional Finite Element Method (3-D FEM) software-Maxwell is employed to simulate several 230-kV insulator strings with various types of porcelain and glass disc insulators and the electric field along them were compared, to investigate the effect of insulator types on electric field distribution.

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“…where is the macroscopic field at the electrode surface, p is the pressure, � � crit = 88.4 kV/(mm MPa) is the critical field strength of SF 6 [31], and ∆ is the minimal distance between ring electrode and PTFE sample. Practically, to save simulation time, the macroscopic field E with semi-ellipsoid shapes is calculated once in a separate run and the ratio of the field from this full simulation to the field with only a smooth half ring is derived.…”

Section: 22mentioning

confidence: 99%