Apparatus and method for performing dissolved gas analysis on a piece of electrical equipment using resonant photo-acoustic spectroscopy and use thereof

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United States of America Patent

PATENT NO 10365209
SERIAL NO

15813747

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Abstract

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An apparatus is described for performing dissolved gas analysis on electrical equipment having components immersed in electrical insulating liquid. The apparatus comprises an analyzer including a photo-acoustic spectroscopy (PAS) measurement system for performing gas analysis on a gas sample wherein the PAS measurement system has an elongated channel including a resonant cavity and an electromagnetic energy source. The resonant cavity includes a first portion and a second portion configured for containing at least part of the gas sample, wherein the first portion defines an optical pathway configured for propagation of electromagnetic energy from the electromagnetic energy source. The resonant cavity includes an element configured for obstructing the propagation of the electromagnetic energy through to the second portion of the resonant cavity. The PAS measurement system is configured to excite a portion of the gas sample in the optical pathway to produce a photo-acoustic signal, which may then be processed to derive information associated with dissolved gas concentrations in the electrical insulating liquid. In some implementations, a pressure regulating element may be used to regulate the pressure in a gas extraction cell so that the pressure lies within a target pressure range. In some implementations, the electromagnetic energy source may be configured to produce a periodically pulsed beam of electromagnetic radiation having a chopping frequency greater than or equal to 150 Hz. One or more damper elements may be used for reducing vibrational interferences with some of the measurement equipment.

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Patent Owner(s)

Patent OwnerAddress
MORGAN SCHAFFER LTD8300 SAINT-PATRICK SUITE 150 LASALLE H8N 2H1

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Beaudoin, Alexandre Montréal, CA 1 4
Brauer, Stephan Montréal, CA 6 11
de, Cotret Samuel René Montréal, CA 2 7
Lebel-Buchanan, Nicholas Montréal, CA 2 7
MacGillivray, Andrew Montréal, CA 2 7
Mincu, Niculae Pointe-Claire, CA 6 36
Voinea, Stefan Brossard, CA 6 14

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