EP2729775A2 - Thermometer - Google Patents
ThermometerInfo
- 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- Withdrawn
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)
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 (de) | 2011-07-09 | 2012-05-25 | Thermometer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2729775A2 true EP2729775A2 (de) | 2014-05-14 |
Family
ID=46210209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12726041.2A Withdrawn EP2729775A2 (de) | 2011-07-09 | 2012-05-25 | Thermometer |
Country Status (8)
Country | Link |
---|---|
US (1) | US20190195697A1 (ko) |
EP (1) | EP2729775A2 (ko) |
KR (1) | KR20140040800A (ko) |
CN (1) | CN103649699A (ko) |
BR (1) | BR112013031346A2 (ko) |
DE (1) | DE102011107006B4 (ko) |
RU (1) | RU2014104508A (ko) |
WO (1) | WO2013007436A2 (ko) |
Family Cites Families (16)
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 |
US8621980B2 (en) * | 2002-07-16 | 2014-01-07 | 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 |
-
2011
- 2011-07-09 DE DE102011107006.4A patent/DE102011107006B4/de not_active Expired - Fee Related
-
2012
- 2012-05-25 CN CN201280033856.8A patent/CN103649699A/zh active Pending
- 2012-05-25 KR KR1020147000713A patent/KR20140040800A/ko not_active Application Discontinuation
- 2012-05-25 WO PCT/EP2012/059790 patent/WO2013007436A2/de active Application Filing
- 2012-05-25 RU RU2014104508/28A patent/RU2014104508A/ru not_active Application Discontinuation
- 2012-05-25 BR BR112013031346A patent/BR112013031346A2/pt not_active IP Right Cessation
- 2012-05-25 EP EP12726041.2A patent/EP2729775A2/de not_active Withdrawn
- 2012-05-25 US US14/123,125 patent/US20190195697A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2013007436A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE102011107006A1 (de) | 2013-01-10 |
WO2013007436A2 (de) | 2013-01-17 |
BR112013031346A2 (pt) | 2017-09-05 |
CN103649699A (zh) | 2014-03-19 |
WO2013007436A3 (de) | 2013-05-02 |
DE102011107006B4 (de) | 2015-06-11 |
US20190195697A1 (en) | 2019-06-27 |
RU2014104508A (ru) | 2015-08-20 |
KR20140040800A (ko) | 2014-04-03 |
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