EP2729775A2 - Thermomètre - Google Patents

Thermomètre

Info

Publication number
EP2729775A2
EP2729775A2 EP12726041.2A EP12726041A EP2729775A2 EP 2729775 A2 EP2729775 A2 EP 2729775A2 EP 12726041 A EP12726041 A EP 12726041A EP 2729775 A2 EP2729775 A2 EP 2729775A2
Authority
EP
European Patent Office
Prior art keywords
coupling piece
insulating sleeve
thermometer
temperature sensor
housing
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP12726041.2A
Other languages
German (de)
English (en)
Inventor
Jalal CHENGAOU
Kai Hämel
Sebastian HOLLUNDER
Martin KUBICZEK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and 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, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Publication of EP2729775A2 publication Critical patent/EP2729775A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
    • G01K2007/422—Dummy objects used for estimating temperature of real objects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/406—Temperature sensor or protection

Definitions

  • the present invention relates to a thermometer, in particular for determining the
  • Winding temperature of an electrical power transformer Winding temperature of an electrical power transformer.
  • a hollow sensor is arranged in a dip tube for installation in a liquid-filled transformer tank, which is surrounded by an insulating tube, which in turn is wrapped with an electrical heating resistor, which in turn is surrounded by another insulating tube.
  • an electrical heating resistor which in turn is surrounded by another insulating tube.
  • Heat transfer is set in the direction of the probe and coolant, that measured by the probe temperature of the respective average or maximum
  • Winding temperature of the power transformer corresponds.
  • the immersion sensor is installed in the transformer tank in such a way that the immersion sleeve dips into the coolant of the transformer. This depends on the
  • the transformer is therefore associated with a current transformer which detects the current flowing through the transformer current.
  • Temperature sensor is assigned and thereby generates one of the respective
  • Calibration can be obtained in this indirect way, an indication of the average or maximum winding temperature for a given current load of the power transformer, d. H. the display of the heated temperature sensor downstream display device in a thermal image of the processes within the power transformer. The display can then be carried out after a corresponding amplification of the measurement signals in a more or less distant control room. Alternatively, it is also possible to electronically process the respective measured values in a control and regulation system,
  • Thermometer installed, which are acted upon indirectly via a separate from the filling of the transformer filling with the temperature of the transformer filling.
  • the thermometers used for this process are therefore equipped with a heater, a mechanical and an electrical sensor.
  • the heater has intentional thermal contact with the surrounding housing tube in contact with the fluid. This contact is formed by a polymeric cladding and an air gap.
  • the heater is divided into two heating elements, one of which surrounds the inner arranged mechanical temperature sensor and the second surrounds the arranged inside the electronic temperature sensor.
  • thermometer described in DE 89 1 1 078 U1 changes its characteristic thermal parameters with changes in air pressure or temperature. Another disadvantage is that the thermometer described thermally separates the mechanical and electrical temperature sensor from each other.
  • Deviations within the tolerances of each subsystem lead to significant discrepancies of the two temperature readings. To prevent this costs a considerable effort.
  • thermometer in particular for determining the winding temperature of an electrical power transformer, in which the influences of the ambient temperature or of the air pressure on the determined temperature values are eliminated and, at the same time, the deviations of the measured values between electrical and mechanical temperature sensors are largely the same can be reduced.
  • the subclaims relate to particularly advantageous developments of the invention.
  • the invention-essential aspect is to be used in a thermometer for
  • Heating element within a made of a thermally conductive material
  • Insulating sleeve and the tubular housing can be reached.
  • the heating element, the electrical and the mechanical temperature sensor in one
  • Thermal resistance to the surrounding liquid is additionally formed by a solid thermal insulator, without getting in the interstices within the
  • thermometers can form air cushion, a total of one
  • thermometer 1 shows a thermometer according to the invention in a lateral
  • Figure 2 shows a thermometer according to the invention in a plan view.
  • thermometer 1 according to the invention is shown in a side sectional view.
  • the thermometer 1 is enclosed by an outer, tubular housing 2, which has an open end 3 and a closed end 4.
  • an outer, tubular housing 2 Within the housing 2 is made of a good heat conducting material
  • Coupling piece 5 which has a plurality of precisely fitting recesses, which are shown in Figure 2, for receiving a heating element 6, a mechanical temperature sensor 7 and an equipped with two sensor elements electrical temperature sensor 8. Between the inner wall of the housing 2 and the outer wall of the coupling piece 5 made of a heat-stable material insulating sleeve 9 is narrow fits, so that ultimately no air gap between the housing 2, the insulating sleeve 9 and the coupling piece 5 can form.
  • the thermal resistance within the coupling piece 5 compared to the internal thermal resistance of the insulating sleeve 9 is so low that it can be assumed that an overall isothermal arrangement of the thermometer 1.
  • the coupling piece 5 can be made for example of an aluminum alloy, while the
  • Insulating sleeve 9 for example made of polyetheretherketone, also called PEEK, may be produced.
  • the heat transfer resistance of the coupling piece 5 to the insulating sleeve 9 and the heat transfer resistance of the insulating sleeve 9 to that of the housing 2 are determined by the geometric dimensions of the coaxially chosen construction of the thermometer 1 significantly not determined by the intervening air gap, since this is very small, i. ⁇ 0.1 mm, and thus when looking at the thermal
  • FIG. 2 shows a sectional view of the plan view of the invention
  • thermometer 1 Well visible from this illustration is the coaxial structure of the thermometer 1 according to the invention, consisting of the outer housing 2, the subsequent insulating sleeve 9 and the coupling piece 5 for receiving the
  • Heating element 6 the mechanical temperature sensor 7 and the electrical
  • Temperature sensor 8 These latter components 6, 7 and 8 are in, provided in the coupling piece 5, a plurality of recesses 10, 1 1 and 12 added, in particular inserted therein. The simple insertion of the heating element 6, the mechanical
  • Temperature sensor 7 and the electrical temperature sensor 8 in the coupling piece 5 allows a particularly uncomplicated replacement of these components 6, 7 and 8 in case of a defect or possibly pending maintenance.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)

Abstract

La présente invention concerne un thermomètre, en particulier pour la mesure de la température de l'enroulement d'un transformateur électrique de puissance. L'aspect principal de l'invention réside en ce qu'un thermomètre pour la mesure de la température de l'enroulement d'un transformateur électrique de puissance comporte une sonde de température électrique ainsi qu'une sonde de température mécanique et un élément chauffant, placés dans un élément de couplage constitué d'un matériau thermoconducteur, ainsi qu'une douille isolante formée d'un matériau résistant à la chaleur, placée entre une paroi externe le l'élément de couplage et une paroi interne d'un boîtier, le boîtier, la douille isolante et l'élément de couplage formant une structure coaxiale sans espace intermédiaire, de manière que des transferts thermiques mesurables se produisent entre les composants individuels, à savoir l'élément de couplage, la douille isolante et le boîtier tubulaire.
EP12726041.2A 2011-07-09 2012-05-25 Thermomètre Withdrawn EP2729775A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011107006.4A DE102011107006B4 (de) 2011-07-09 2011-07-09 Thermometer
PCT/EP2012/059790 WO2013007436A2 (fr) 2011-07-09 2012-05-25 Thermomètre

Publications (1)

Publication Number Publication Date
EP2729775A2 true EP2729775A2 (fr) 2014-05-14

Family

ID=46210209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12726041.2A Withdrawn EP2729775A2 (fr) 2011-07-09 2012-05-25 Thermomètre

Country Status (8)

Country Link
US (1) US20190195697A1 (fr)
EP (1) EP2729775A2 (fr)
KR (1) KR20140040800A (fr)
CN (1) CN103649699A (fr)
BR (1) BR112013031346A2 (fr)
DE (1) DE102011107006B4 (fr)
RU (1) RU2014104508A (fr)
WO (1) WO2013007436A2 (fr)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB561918A (en) * 1942-12-05 1944-06-09 Parsons C A & Co Ltd Improvements in or relating to temperature indicator devices or the like for liquid immersed electrical apparatus
GB1161985A (en) * 1966-07-26 1969-08-20 English Electric Co Ltd Device for Determining the Temperature of Electrical Apparatus
US4036058A (en) * 1976-08-05 1977-07-19 Qualitrol Corporation Hot spot thermometer
DE8911078U1 (de) * 1989-09-16 1989-11-23 MESSKO Albert Hauser GmbH & Co. KG, 6370 Oberursel Tauchfühler für Temperaturmessungen
DE4040910C2 (de) * 1990-12-20 1993-11-11 Emerson Electric Gmbh Fühlerelement für eine temperaturabhängige Schalt-, Regel- oder Steuereinrichtung
DE19648332C2 (de) * 1996-11-22 2000-11-23 Messko Albert Hauser Gmbh & Co Verfahren zur Nachbildung und Anzeige der Wicklungstemperatur eines elektrischen Leistungstransformators und Thermometer zur Durchführung des Verfahrens
CN1377049A (zh) * 2002-05-09 2002-10-30 刘有斌 气体绝缘干式空芯电抗器
AU2003256592A1 (en) * 2002-07-16 2004-02-02 Bunn-O-Matic Corporation Temperature control system
US7128467B2 (en) * 2004-03-18 2006-10-31 General Electric Company Thermistor probe assembly and method for positioning and moisture proofing thermistor probe assembly
DE102005020809B3 (de) * 2005-05-04 2006-10-19 Maschinenfabrik Reinhausen Gmbh Sensor
DE102007002369B3 (de) * 2007-01-17 2008-05-15 Drägerwerk AG & Co. KGaA Doppeltemperatursensor
US7520668B2 (en) * 2007-01-24 2009-04-21 Innova Electronics Corporation Multi function thermometer
DE102008026642B4 (de) * 2008-06-03 2010-06-10 Dräger Medical AG & Co. KG Doppeltemperatursensor mit einem Aufnahmeelement
US8087825B2 (en) * 2009-12-21 2012-01-03 Weiss Instruments, Inc. Mechanical and electronic temperature reading system with built-in failure and inaccuracy detection
US9234712B2 (en) * 2012-07-31 2016-01-12 Abb Inc. Self-aligning plug for positioning a temperature sensor within a transformer winding
US9046423B2 (en) * 2012-08-01 2015-06-02 Qualitrol Company, Llc Hybrid mechanical and electrical transformer monitor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013007436A2 *

Also Published As

Publication number Publication date
RU2014104508A (ru) 2015-08-20
KR20140040800A (ko) 2014-04-03
CN103649699A (zh) 2014-03-19
WO2013007436A3 (fr) 2013-05-02
WO2013007436A2 (fr) 2013-01-17
DE102011107006B4 (de) 2015-06-11
BR112013031346A2 (pt) 2017-09-05
DE102011107006A1 (de) 2013-01-10
US20190195697A1 (en) 2019-06-27

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