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WO2006117033A1 - Capteur capacitif pour saisir un niveau d'huile avec electrode de protection et chauffage - Google Patents

Capteur capacitif pour saisir un niveau d'huile avec electrode de protection et chauffage Download PDF

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Publication number
WO2006117033A1
WO2006117033A1 PCT/EP2006/001401 EP2006001401W WO2006117033A1 WO 2006117033 A1 WO2006117033 A1 WO 2006117033A1 EP 2006001401 W EP2006001401 W EP 2006001401W WO 2006117033 A1 WO2006117033 A1 WO 2006117033A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor according
housing
measuring
sensor
wall
Prior art date
Application number
PCT/EP2006/001401
Other languages
German (de)
English (en)
Inventor
Dieter Dohnal
Karsten Viereck
Norbert Reindl
Axel Seikowsky
Original Assignee
Maschinenfabrik Reinhausen Gmbh
Micro-Epsilon Messtechnik Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Reinhausen Gmbh, Micro-Epsilon Messtechnik Gmbh & Co. Kg filed Critical Maschinenfabrik Reinhausen Gmbh
Publication of WO2006117033A1 publication Critical patent/WO2006117033A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2888—Lubricating oil characteristics, e.g. deterioration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/226—Construction of measuring vessels; Electrodes therefor

Definitions

  • the invention relates to a capacitive sensor for detecting the oil condition, in particular the oil condition of insulating oils electrical equipment.
  • a capacitive sensor is in principle suitable for detecting any non-electrical quantity that can be attributed to a change in the dielectric; Such a sensor is therefore also applicable to the measurement of oil quality, which is also characterized by the dielectric constant of the oil.
  • a capacitive sensor for detecting the oil condition has a sensor cell surrounded by an outer tube.
  • the sensor cell itself has a level sensor and, independently, an oil quality sensor.
  • the outer tube is immersed in the oil to be examined; The oil fills a between sensor cell and outer tube existing interior.
  • the outer tube has on its inner side a concentric counter electrode for the capacitive measurement with the mounted on the outside of the sensor cell capacitor surface of the oil quality sensor.
  • a disadvantage of this known sensor is that the measurement result is highly temperature-dependent, since the dielectric constant of the oil under investigation changes with temperature.
  • the known sensor For the determination of the oil quality of oil-filled electrical equipment, eg. B. the insulating oil of power transformers, which in operation a strongly fluctuating, u. a. From the respective electrical load and the selected type of cooling of the respective transformer depending on the temperature, the known sensor is not suitable.
  • Another disadvantage of the known sensor is the dependence of the measurement result of the impedance of the oil and thus the loss factor tan ⁇ .
  • the object of the invention is therefore to present a capacitive sensor, in which the temperature dependence of the measurement result as well as the influence of the loss factor tan ⁇ are eliminated with a simple structural design.
  • the invention is based on a sensor which is designed in the form of a capacitive voltage divider, the measurement being carried out to ground.
  • an electric heater is provided in the sensor according to the invention, which is regulated and ensures that the temperature between the Measuring electrodes is kept constant and thus the measurement result no longer depends on the respective temperature of the oil.
  • the electrodes of the sensor and the heater are completely embedded in a both transformer oil-resistant and temperature-resistant plastic.
  • suitable plastics may be, for example, PTFE or PEEK.
  • PEEK stands for the material of the semi-crystalline thermoplastic polyether ether ketone. This polyetheretherketone having the chemical formula [- (C 6 H 4 ) -CO- (CSHA) -O- (C 6 HA) -O-] n is known to the person skilled in the art. This material has been used above all in engine construction and in sports and leisure equipment in various unreinforced than fiber-reinforced variants.
  • Fig. 1 shows a sensor according to the invention in a side sectional view
  • Fig. 2 shows this sensor in a lateral view
  • FIG. 4 shows a detail from FIG. 1 with the effective electrode regions
  • FIG. 5 shows a schematic representation of the effect of the sensor according to the invention as a cylindrical capacitor.
  • FIG. 6 shows a schematic representation of the effect of the sensor according to the invention as a stray field capacitor.
  • the sensor according to the invention consists for example of an outer, tubular housing 1; From Figure 1 it can be seen that the individual components in the interior of the housing 1, which will be explained in more detail below, are arranged rotationally symmetrical. In the context of the invention, other embodiments are conceivable instead of the tubular housing 1 described here and the rotationally symmetrical structure explained in more detail below.
  • the sensor according to the invention can also be designed rectangular with rectangular or segmented electrodes.
  • the housing 1 itself can z. ß. be coated with glisscoat.
  • Above the housing 1 is closed by a cover 2 with screw 3.
  • an outer circumferential cover tube 4 In the lower part of the housing 1 is an outer circumferential cover tube 4, which is particularly advantageous from the already described PEEK material.
  • an inner housing 5 Centrally in the interior of the tubular housing 1, an inner housing 5, also particularly advantageous from PEEK material arranged.
  • the inner housing 5 rests with an upper circumferential flange 6 on an inner, likewise circumferential collar 7 of the housing 1.
  • a circumferential seal 8 is inserted into a groove.
  • the inner housing 5 is cup-shaped and dimensioned such that in its lower region, ie below the flange 6, an annular measuring gap 9 between the outer wall of the housing 5 and the inner wall of the housing 1 remains.
  • This measuring gap 9 is in connection with horizontally penetrating the housing 1 and outwardly leading holes 10. The oil whose condition is to be detected, completely fills the measuring gap 9 and can circulate through these holes 10.
  • a measuring electrode -11 is arranged concentrically, the connection region 12 leads upwards.
  • insulators 13, 14, which, like the measuring electrode 11 itself, are concentrically formed circumferentially.
  • guard electrodes 15, 16 are arranged on both sides of these insulators 13, 14, in each case on the side facing away from the measuring electrode 11, again concentrically surrounding guard electrodes 15, 16 are arranged.
  • the one guard electrode 15 is formed as the entire lower portion of the cup-shaped housing 5 filling center part, while the other guard electrode 16 has a concentric annular shape.
  • a circumferential electric heating coil 17 is provided between the inner wall of the cover tube 4 and the inner region of the housing 1.
  • an electronic temperature sensor 18 preferably a specialist known type PT100, arranged. Further technical information about this type of PT100 can be found eg. For example, www.mercatio.com, www.nagy-instruments.de or www.burster.de. From above, the housing 5 is closed by a cover 19, which is fastened centrally with a screw 20 on the guard electrode 15.
  • the components are arranged concentrically around each other, wherein, as described, the two guard electrodes 15, 16 and the intermediate measuring electrode 11, each spatially and electrically separated from each other by insulators 13, 14, with their electrically effective areas abut the inner wall of the housing 5.
  • the outer wall of this housing 5 forms the inner wall of the measuring gap 9 through which the oil flows.
  • the circulating heating coil 17 is arranged in the outer wall of the concentric measuring gap 9. Not shown are the electrical leads of the measuring electrode 11, the guard electrodes 15, 16 and the temperature sensor 18. These leads are guided by a not shown passage to the outside.
  • a plug 22 is provided for the connection of the measuring line.
  • the heating coil 17 ensures that the oil in the measuring gap 9, whose state is detected by the capacitive arrangement of the described components, always has the same temperature.
  • changes in the dielectric constant due to temperature changes of the transformer oil o. ⁇ . In the environment, eg. B. in the transformer tank, excluded.
  • FIG. 5 shows, schematically with indicated field lines, the effect of the described sensor according to the invention as a guard ring capacitor.
  • the measuring electrode 11 is gapped by the guard electrodes 15, 16 arranged on both sides and the field is homogenized between the measuring electrode 11 and the housing 1 acting as the counterelectrode. Thus, practically only the dielectric in the region of the measuring electrode 11 is evaluated.
  • the sensor according to the invention thus allows a temperature-independent detection of the relative dielectric constant as a measure of the state of the oil, d. H. its (dielectric) insulating properties. Furthermore, the disturbing influence of the loss factor tan ⁇ is eliminated in the sensor according to the invention.
  • the sensor has a stable measuring signal in sufficient amplitude; typical values are an operating temperature of 75 degrees C, a sensor array capacitance of 1.8 pF at a frequency of 35 kH.
  • FIG. 6 also schematically shows, with indicated field lines, the possible effect of the described sensor according to the invention as stray field capacitor.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un capteur capacitif pour saisir un niveau d'huile, notamment le niveau d'huile isolante de matériels électriques. Selon l'invention, un boîtier interne est disposé dans un boîtier externe de sorte à ménager un interstice de mesure entre eux. Au niveau de cet interstice de mesure sont montées une électrode de mesure et une électrode de protection, laquelle est isolée contre l'électrode de mesure et montée des deux côtés de celle-ci. Dans la paroi du boîtier externe se trouve en outre une bobine de chauffage électrique, dans la zone de l'interstice de mesure.
PCT/EP2006/001401 2005-05-04 2006-02-16 Capteur capacitif pour saisir un niveau d'huile avec electrode de protection et chauffage WO2006117033A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510020809 DE102005020809B3 (de) 2005-05-04 2005-05-04 Sensor
DE102005020809.6 2005-05-04

Publications (1)

Publication Number Publication Date
WO2006117033A1 true WO2006117033A1 (fr) 2006-11-09

Family

ID=36117379

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/001401 WO2006117033A1 (fr) 2005-05-04 2006-02-16 Capteur capacitif pour saisir un niveau d'huile avec electrode de protection et chauffage

Country Status (2)

Country Link
DE (1) DE102005020809B3 (fr)
WO (1) WO2006117033A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019049430A1 (fr) * 2017-09-11 2019-03-14 Ｋｙｂ株式会社 Dispositif de détection de propriété de fluide
US10514025B2 (en) * 2014-12-10 2019-12-24 Daikin Industries, Ltd. Preheater for compressor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011107006B4 (de) * 2011-07-09 2015-06-11 Maschinenfabrik Reinhausen Gmbh Thermometer
DE102015200203A1 (de) * 2015-01-09 2016-07-14 Zf Friedrichshafen Ag Messanordnung zur Erkennung von Fremdpartikeln in einem Medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364777A (en) * 2000-07-12 2002-02-06 Sondex Ltd An improved capacitance measurement probe
US6459995B1 (en) * 1997-05-07 2002-10-01 Lubrigard Limited Electrical measurement of oil quality
US20030057968A1 (en) * 2001-09-26 2003-03-27 Wang Da Yu Liquid property sensor
US20040212375A1 (en) * 2003-04-28 2004-10-28 Detroit Diesel Corporation Method and apparatus for stabilizing parasitic error capacitance in oil quality sensors
DE10325132A1 (de) * 2003-06-04 2004-12-23 Conti Temic Microelectronic Gmbh Verfahren zur Herstellung eines Bauteils, insbesondere eines Ölzustandssensors sowie nach einem solchen Verfahren hergestelltes Bauteil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6459995B1 (en) * 1997-05-07 2002-10-01 Lubrigard Limited Electrical measurement of oil quality
GB2364777A (en) * 2000-07-12 2002-02-06 Sondex Ltd An improved capacitance measurement probe
US20030057968A1 (en) * 2001-09-26 2003-03-27 Wang Da Yu Liquid property sensor
US20040212375A1 (en) * 2003-04-28 2004-10-28 Detroit Diesel Corporation Method and apparatus for stabilizing parasitic error capacitance in oil quality sensors
DE10325132A1 (de) * 2003-06-04 2004-12-23 Conti Temic Microelectronic Gmbh Verfahren zur Herstellung eines Bauteils, insbesondere eines Ölzustandssensors sowie nach einem solchen Verfahren hergestelltes Bauteil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10514025B2 (en) * 2014-12-10 2019-12-24 Daikin Industries, Ltd. Preheater for compressor
WO2019049430A1 (fr) * 2017-09-11 2019-03-14 Ｋｙｂ株式会社 Dispositif de détection de propriété de fluide

Also Published As

Publication number Publication date
DE102005020809B3 (de) 2006-10-19

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