Kinnares, Vijit

Preferred name

Kinnares, Vijit

Alternative Name

Kinnares, V.

Main Affiliation

School of Engineering

Email

vijit.ki@kmitl.ac.th

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Relative permittivity detector for cable insulators
(2000-01-01)
Kerdonfag, P.
;
Potivejkul, S.
;
Jamnian, S.
;
Kinnares, V.
This paper presents a new measurement technique of relative permittivity (ε<inf>r</inf>) for cable insulators. The travelling wave and reflection wave theory are applied to generate low voltage pulse signal feeding cable lines that need to know ε<inf>r</inf> of insulators. By measuring interval of travelling wave, ε<inf>r</inf> can be estimated for any types of cable lines. A prototype consists of pulse generator circuit, wave detection circuit, counter circuit and microcontroller unit for processing and display via LCD. This model is portable, compact, comfortable and capable of displaying ε<inf>r</inf> value immediately. From the test results, this model has accuracy within acceptable values.