Dissolved gas analysis devices, systems, and methods

Patent metadata

Field	Value
Publication number	US-2018259451-A1
Application number	US-201715458010-A
Country	US
Kind code	A1
Filing date	Mar 13, 2017
Priority date	Mar 13, 2017
Publication date	Sep 13, 2018
Grant date	—

Abstract

Devices, systems, and methods for determining gas characteristics to monitor transformer operation include extracting gas from transformer fluid for analysis.

First claim

1 . A gas analysis system for determining characteristics of gas dissolved in a fluid of a transformer, the system comprising:
an extraction coil for contact with the fluid, the extraction coil including gas-permeable material for receiving dissolved gas, a gas analyzer for determining gas characteristics, the gas analyzer including a gas cell having a cavity for receiving gas for analysis, and a gas circuit formed to include the extraction coil and the gas analyzer to circulate gas.

2 . The gas analysis system of claim 1 , wherein the extraction coil includes a number of coil loops each permitting dissolved gas to permeate therein.

3 . The gas analysis system of claim 1 , wherein the gas circuit includes a transport conduit fluidly coupled with each of the extraction coil and the gas analyzer to transport gas between the extraction coil and the gas cell for analysis.

4 . The gas analysis system of claim 3 , wherein the transport conduit includes a motive pressure source fluidly coupled with the extraction coil to circulate gas through the transport conduit.

5 . The gas analysis system of claim 4 , wherein the motive pressure source is fluidly coupled with the extraction coil to provide a lower pressure within the extraction loop relative to a pressure within the cavity of the gas cell.

6 . The gas analysis system of claim 3 , wherein the transport conduit includes a supply segment fluidly connected to provide gas from the extraction loop to the gas cell and a return segment fluidly connected to provide gas from the gas cell to the extraction loop.

7 . The gas analysis system of claim 1 , wherein the gas analyzer includes a light source and at least one light detector for receiving light from the light source.

8 . The gas analysis system of claim 7 , wherein the light source is arranged to pass light from one side of the gas cell through gas within the cavity of the gas cell to another side of the gas cell, and the at least one light detector is arranged on the another side to receive light from the light source.

9 . The gas analysis system of claim 1 , wherein the cavity of the gas cell is for receiving dissolved gas extracted from the fluid.

10 . The gas analysis system of claim 1 , wherein the gas-permeable material includes a fluoropolymer.

11 . The gas analysis system of claim 10 , wherein the gas-permeable material includes a fluoroplastic having at least one of: a yield strength within the range of about 26 MPa to about 29 MPa at about 73° F., a yield strength within the range of about 0.5 MPa to about 13 MPa at about 302° F., a yield strength within the range of about 4 MPa to about 13 MPa at about 428° F., a tensile strength within the range of about 24 MPa to about 29 MPa at about 73° F., a tensile strength within the range of about 1 MPa to about 15 MPa at about 302° F., and a tensile strength within the range of about 3 MPa to about 7 MPa at about 428° F.

12 . The gas analysis system of claim 1 , wherein the extraction coil is formed as a conduit having an inner volume for receiving gas permeating through the gas-permeable material.

13 . The gas analysis system of claim 12 , wherein a gas species that is both within the inner volume and dissolved in the fluid is in equilibrium.

14 . A transformer, comprising:
at least one electrical winding, a fluid system including fluid for insulating the at least one electrical winding, and a gas analysis system for determining characteristics of gas dissolved in the fluid of the fluid system, the gas analysis system including an extraction coil and a gas cell for analysis of gas, the extraction coil arranged in contact with the fluid and including a gas-permeable material for receiving dissolved gas from the fluid, the extraction coil and the gas cell fluidly communicating to form a gas circulation loop for circulating gas.

15 . The transformer of claim 14 , wherein the gas cell is arranged for determining characteristics of gas extracted from the fluid.

16 . The transformer of claim 15 , wherein a transport conduit is fluidly coupled with each of the extraction coil and the gas cell to transport gas received from the fluid to the gas cell for analysis.

17 . The transformer of claim 15 , wherein the extraction coil is formed as a conduit having an inner volume for receiving gas permeating through the gas-permeable material.

18 . The transformer of claim 17 , wherein a gas species that is both within the inner volume and dissolved in the fluid is in equilibrium.

19 . The transformer of claim 14 , wherein the gas-permeable material includes a fluoropolymer.

20 . The gas analysis system of claim 19 , wherein the gas-permeable material includes a fluoroplastic having at least one of: a yield strength within the range of about 26 MPa to about 29 MPa at about 73° F., a yield strength within the range of about 0.5 MPa to about 13 MPa at about 302° F., a yield strength within the range of about 4 MPa to about 13 MPa at about 428° F., a tensile strength within the range of about 24 MPa to about 29 MPa at about 73° F., a tensile strength within the range of about 1 MPa to about 15 MPa at about 302° F., and a tensile strength within the range of about 3 MPa to about 7 MPa at about 428° F.

Assignees

• Abb Schweiz Ag

Inventors

• Buijs Henry L
• Bibeau Louis-Philippe A
• Ouellet-Berlanger Alex
• Desbiens Raphael N

Classifications

• G01N2001/2267

  separating gas from liquid, e.g. bubbles · CPC title

• H01F27/402

  Association of measuring or protective means · CPC title

• G01N2021/3595

  using FTIR · CPC title

• G01N1/2205 Primary

  with filters · CPC title

• G01N21/65

  Raman scattering · CPC title