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WO2010003519A1 - Système à thermocouples compensé - Google Patents

Système à thermocouples compensé Download PDF

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Publication number
WO2010003519A1
WO2010003519A1 PCT/EP2009/004335 EP2009004335W WO2010003519A1 WO 2010003519 A1 WO2010003519 A1 WO 2010003519A1 EP 2009004335 W EP2009004335 W EP 2009004335W WO 2010003519 A1 WO2010003519 A1 WO 2010003519A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermocouple
thermo
wires
wire
compensation element
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.)
Ceased
Application number
PCT/EP2009/004335
Other languages
German (de)
English (en)
Inventor
Daniel Körtvelyessy
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.)
Thermo-Control Kortvelyessy GmbH
Original Assignee
Thermo-Control Kortvelyessy GmbH
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 Thermo-Control Kortvelyessy GmbH filed Critical Thermo-Control Kortvelyessy GmbH
Publication of WO2010003519A1 publication Critical patent/WO2010003519A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/10—Arrangements for compensating for auxiliary variables, e.g. length of lead
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
    • H10N10/17—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the structure or configuration of the cell or thermocouple forming the device

Definitions

  • the invention relates to a thermocouple system and in particular to a Thermoeleme ⁇ ta ⁇ ord ⁇ u ⁇ g, which is used together with a measuring device.
  • thermocouples also referred to below as thermocouples
  • thermocouples have been known for a long time and are usually used in a thermocouple system or thermocouple system, i. together with a measuring device which measures the thermal voltage generated between the thermocouple wires of the thermocouple, which is almost proportional to the temperature prevailing at a measuring point.
  • thermocouples When thermocouples are used in the field of alternating magnetic fields or moved in a magnetic field, currents or voltages are induced in the thermocouples forming thermo wires. These induced currents or voltages can influence the thermoelectric voltage generated by the temperature.
  • thermocouples For example, occur when using thermocouples in the vicinity of a power line of a stove oven on such disturbing alternating magnetic fields. These external influences can result in up to 20% measuring errors in practice. A considerable influence on the thermo-voltage arising at the connection ends of the thermocouple with resulting measurement errors is to be expected, in particular also in the case of temperature measurement with thermocouples in the vicinity of generators or transformers. In such cases a temperature measurement with thermocouples is often not possible.
  • the temperature is calculated via the heat balance of the cooling fluids (see WO / 2006/050886).
  • this solution does not allow an accurate and immediate and above all, but no direct measurement of the real temperature.
  • the invention has set itself the goal of providing a thermocouple system in particular a Thermopananord ⁇ ung or a Thermoeleme ⁇ ta ⁇ ord ⁇ u ⁇ g, in a simple way without interference even in an alternating magnetic field or during the movement of the thermocouple system by a magnetic field a Temperaturmessu ⁇ g can be performed.
  • the invention provides the use of a compensation element, which is electrically conductively connected to the temperature measuring thermocouple assembly ( Figure 3), wherein the compensation element is connected against the thermocouple assembly.
  • the invention provides that the compensation element compensates for the induced by magnetic field change in the thermocouple interference voltages or interference currents.
  • the compensation element is formed by a thermocouple, which has the same physical or physical structure, as provided for the temperature measurement thermocouple.
  • the compensation element does not generate any thermoelectric voltage when the junction of the thermocouple wires between them is heated.
  • section 0.2.2.3 on pages (24) and (25) of the book by Dr. Ing. Laszl ⁇ Körtvelyessy "Thermocouple Practice", 3rd Edition This section describes copper - copper thermocouples that do not generate a thermoelectric voltage.
  • the invention relates to an electrical component with a thermocouple.
  • Transformers are usually two coils, which can change the voltage higher or lower.
  • an elevated temperature may jeopardize the device, in particular the windings themselves, by relinquishing their function, thus causing a short circuit in the winding, surrounding the insulating layer surrounding the wires of the windings and being stable only up to a certain temperature range ,
  • the wire diameter is usually increased, so that the resistance lowers and so less heat output is generated.
  • thermocouples in the winding. Unfortunately, this obvious task is not feasible with the current state of the art.
  • the choice of technologies for temperature measurement are diverse but have disadvantages that do not allow a specific application or only very limited.
  • thermometers as disclosed for example in DE 102005004835 B4.
  • One of them is the group of thermocouples, consisting of at least two thermo legs, which are made of different materials, such as NiCr and NiAl.
  • the other group is that of resistance thermometers, for example PtIOO.
  • thermometers Both types of thermometers are used in tens of thousands in many applications and are correspondingly inexpensive and proven in practice. In terms of the task, the disadvantage of these thermometers is their sensitivity to the alternating magnetic fields prevailing in the transformer. These fields cause an induced voltage, which falsifies the measuring voltage and thus does not allow a correct measurement. Accordingly, this technology is a solution.
  • the next technology would be an optical measurement, for example with infrared laser or glass fiber, as disclosed in EP 1881311.
  • These technologies are not sensitive to the magnetic fields, but have the disadvantage that only the externally visible surface of the transformer can be checked.
  • the technology is relatively sensitive to the surface texture. Especially at temperatures below 600 c C, the measurement signal is very weak. So here is only partially an application feasible.
  • additional cooling by air or liquid media is required.
  • WO / 2006/050886 discloses the control over the heat flow of the cooling medium. This method has the weakness that only the transformer is detected as a complete component and not local points can be measured.
  • the invention solves the above-mentioned problems by using for measurement a metallic thermocouple having a compensation element. It contains at least two. Further . Wires consisting of one of the thermocouple materials. This thermocouple arrangement will be explained with reference to FIGS. 6 and 7.
  • thermocouple assembly Since this thermocouple assembly is insensitive to magnetic fields and can also be made from inexpensive materials, it can be installed at critical points in the machine.
  • FIG. 1 shows a thermocouple system according to the prior art
  • FIG. 1 a shows a side view
  • FIG. 1 b shows a plan view of the connection point
  • FIG. 1 c shows a section of the plane A - A in FIG. 1 a;
  • FIG 2 shows schematically a detail of Figure 1 and that of the thermocouple wires of the thermocouple shown in Figure 1;
  • FIG. 3 shows a schematic circuit diagram of an exemplary embodiment of a thermocouple system according to the invention, consisting of a measuring device and a thermocouple arrangement according to the invention;
  • FIG. 4 shows a schematic circuit diagram of an embodiment of a thermocouple system according to the invention, in which the occurring voltages are plotted;
  • FIG. 5 is a schematic representation of an advantageous embodiment of the invention in section, consisting of the thermocouple, the compensation element and the measuring device j
  • FIG. 6 shows a simple transformer (801) as prior art.
  • This transformer has a primary winding (802) and a secondary winding (03) and a metallic core (04).
  • core and winding 807, 808, 809, 810), in the middle (811, 812) and at the edge (813, 814, 815, 815) each incorporated a thermocouple in the described thermocouple assembly; and
  • FIG. 7 shows the embodiment of a thermocouple assembly consisting of the positive thermo leg (826) and the negative thermo leg (818).
  • 1 shows a Thermoeleme ⁇ tsystem according to the prior art (DE 30302010) with two thermocouples and a separate empty protective tube (08).
  • This conduit (08) allows the verification of existing thermocouples during operation, without disturbing this by lowering the temperature.
  • It shows an embodiment with a Anschlußk ' sacrifice (01), a metallic protective tube (02), three 0 5mm thin ceramic protective tubes. side by side (03) and the pressure bushing of the passage (04) of the compensation line and the Aus GmbHsleitu ⁇ g (13) itself.
  • connection point (19) In the connection head (01) (hereinafter referred to as connection point (19)) are further two terminals (05) and (06) and an opening (05) is provided, which allows access to the empty pipe (08).
  • the described prior art is mainly used in vacuum ovens with a quenching pressure of up to 20 bar.
  • the enlarged section A - A in Figure 1c shows the three ceramic protective tubes (10a, 10b and 08). Of these, a tube is empty (08), in which the review of the two thermocouples, each consisting of a capillary (09) and a positive thermo wire (12) and a negative thermo wire (11) passing through a junction, preferably at the measuring point eg welding or soldering, forming a thermocouple.
  • thermocouple (14) from FIG. 1 in detail.
  • thermo wire 15
  • thermo leg in particular a negative thermo wire (16).
  • connection point (17) which is also referred to as a solder joint, weld or measuring point.
  • connection point (17) is also referred to as the measuring point (18).
  • reference numeral 19 designates the connection point which is at the "cold" end of
  • thermocouple system (3.1) according to the invention is shown in FIGS. 3 and 4, namely a measuring device (24) and a thermocouple arrangement (34).
  • the thermocouple assembly (34) has a thermocouple 14 and a compensation element (35).
  • thermo-wire (15) is made of NiCr, for example, and is called a "plus" pole thermo-wire or a positive thermo-wire (15) .
  • the second thermo-wire (16) of the thermocouple is connected to the positive thermo-wire (15) at the junction (17). welded, for example, has a negative pole at a connecting or connecting point (30).
  • the second thermal wire (16) consists, for example, of Ni and is used as a negative pole thermo-wire or as a negative thermo-wire (16). designated.
  • thermo wires (15, 16) further materials / alloys can be used, such as platinum rhodium (PtRh) - platinum (Pt).
  • the compensating element (35) is formed by two thermo wires (28) and (29), one of the thermo wires, e.g. Thermodrome (28), at the so-called cold end (30) of the thermocouple (14) z ⁇ B. weld through a joint.
  • the two thermo wires (28) and (29) of Kompensatio ⁇ selements (35) are made of the material of the negative thermo wire 16.
  • Figure 5 shows an advantageous embodiment of the arrangement of the four
  • thermocouple assembly (34) in cross section and the connected measuring device (24).
  • the thermocouple wires are surrounded by an insulating layer (37) and are enclosed in a jacket (36). From Figure 5 it can be seen that the distances of the thermocouple wires to each other are as small as possible.
  • the advantageous embodiment has the property that the counter circuit of the compensation element completely compensates even these small induced voltages.
  • thermocouple wires (15) and (29) are optionally connected in the connection point (19) with a compensation line (13) consisting of a positive thermo-wire (25) and a negative thermo-wire (26). wherein the materials used of the compensating leads are made of lower quality alloys than the thermocouple wires (15) and (16).
  • the embodiment of Figs. 3 and 4 may also have a reverse polarity in which the compensating element (35) is made of the positive thermo-wire (15) and in this case at the terminal end of the positive thermo-wire (15 ) enters a connection point.
  • FIG. 3 and also FIG. 4 show a thermocouple arrangement (34) in which a thermocouple (14) formed by a positive thermo-wire (15) (eg ' NiCr) and a negative thermo-wire (16) (eg Ni) has a thermoelectric voltage and a compensation element (35), formed by two negative or two positive thermo wires (28, 29), which can not generate a thermoelectric voltage, since the thermocouple wires (28, 29) of the compensation element (35) consist of two identical materials.
  • a thermocouple (14) formed by a positive thermo-wire (15) eg ' NiCr
  • a negative thermo-wire (16) eg Ni
  • a compensation element 35
  • thermocouple wires (28) and (29) are made of one or the other material of the thermocouple wires (15) and (16).
  • thermoelectric voltage generated between the thermocouple (15) and (16) and tapped off at the connection point (18) and 0 is the non-developing one Thermospan ⁇ ung between the existing of the same material thermo wires (28, 29) of Kompensatio ⁇ siatas (35).
  • thermocouple arrangement (34) By moving this thermocouple arrangement (34) (see FIG. 3) through a magnetic field which is generated, for example, by a north pole (32) and a south pole (33), the thermocouple wires (15, 16) and (28 , 29) the same Kasspan ⁇ ung
  • thermocouple (14) By the shown suitable circuit of the compensation element (35) whose induced voltage is set against that of the thermocouple (14) and it applies:
  • This voltage U tot occurs, as shown in Figure 4, on the terminals (20) and (21).
  • thermocouple wires (15) and (16) or (28) and (29) are electrically insulated from each other and electrically connected only at the connection points (17, 27) and (30).
  • thermocouple assembly (34) is immune to any magnetic field movements and field strength changes, since the induced voltages are always the same and cancel each other out.
  • the thermocouple assembly (34) thus provides the unadulterated thermal voltage. It can also be said that a parallel connection of the two elements (14, 35) would not be technically correct, since the compensation element (12) causes a short circuit in the measuring device (24), so that the temperatures at the connection terminals (22) and (23 ) and not that of the measuring point (18) would be measured. Likewise, a series circuit would double the Störspa ⁇ nache.
  • a compensation line (13) must often be provided between the measuring device (24) and the thermocouple arrangement (31). 'The usually two conductors, the compensation line can have a considerable length, for example, (20) m or more, and consist of a less expensive material than. the material that must be used for the thermocouple wires.
  • the compensation line (13) has a similar characteristic at low temperatures as the thermocouple wires. As alloys, for example, nickel / copper, copper alloys are used.
  • the equalizing line (13) should be outside the magnetic field.
  • the compensation line (13) is also located within a magnetic field (eg in the vicinity of a transformer or a power line), so in the compensation line (13) induced disturbances can be compensated in the same way that of the thermocouple assembly (31).
  • FIG 7 shows the embodiment of a thermocouple assembly consisting of the positive thermo leg (826) and the negative thermo leg (818) which at the measuring point via a connection (817) electrically conductive with each other are connected.
  • a compensation element in the example consisting of two negative thermo legs (822) and (824), which are electrically conductively connected to one another at the measuring point via a connection (823), is connected in opposite directions with the thermocouple.
  • the positive thermo leg (826) and the return line of the compensation element (824) are here connected to a measuring instrument (825).
  • This connection can also be made via an equalizing line consisting of a negative equalizing line wire (827) and a positive equalizing line wire (828).
  • thermocouple on FIG. 7 can have a design which fits into the intermediate spaces of the winding.
  • a complete recording of the temperatures in the transformer can be carried out with a measuring recorder.
  • the measurement signals can also function as triggers to trigger an alarm above a certain value.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

La présente invention concerne un agencement de thermocouples comportant au moins un thermocouple présentant au moins deux fils dotés chacun d'une extrémité de mesure, et un élément de compensation associé au thermocouple, constitué d'au moins un autre fil, de préférence deux fils.
PCT/EP2009/004335 2008-06-16 2009-06-16 Système à thermocouples compensé Ceased WO2010003519A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102008028283.9 2008-06-16
DE102008028283 2008-06-16
DE102009005924.5 2009-01-23
DE102009005924A DE102009005924A1 (de) 2008-06-16 2009-01-23 Kompensiertes Thermoelementensystem

Publications (1)

Publication Number Publication Date
WO2010003519A1 true WO2010003519A1 (fr) 2010-01-14

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Application Number Title Priority Date Filing Date
PCT/EP2009/004335 Ceased WO2010003519A1 (fr) 2008-06-16 2009-06-16 Système à thermocouples compensé

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DE (1) DE102009005924A1 (fr)
WO (1) WO2010003519A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108469308A (zh) * 2018-07-10 2018-08-31 厦门市计量检定测试院 一种表面测温仪
CN116529573A (zh) * 2020-11-30 2023-08-01 Ls电气株式会社 多通道热电偶测量装置
DE102022123631A1 (de) * 2022-09-15 2024-03-21 Temperaturmeßtechnik Geraberg GmbH Thermoelektrische Mess- und Diagnosevorrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013103733U1 (de) 2013-08-16 2013-10-08 Temperaturmeßtechnik Geraberg GmbH Schneller Stufentemperaturfühler
DE202014103008U1 (de) 2014-07-01 2014-10-28 Temperaturmeßtechnik Geraberg GmbH Mantelthermometer mit mehreren längsversetzten Messstellen
DE102017110445B4 (de) * 2017-05-15 2020-02-13 Vaillant Gmbh Vorrichtung und Verfahren zum Messen von Temperaturen mit Thermoelementen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612779A (en) * 1950-03-22 1952-10-07 Stewart F Mulford Compensated thermocouple
GB1597409A (en) * 1978-04-28 1981-09-09 Marconi Co Ltd Thermocouples and thermocouple arrangements
US20050098201A1 (en) * 2003-11-07 2005-05-12 Kim Yong G. Pure metal thermocouple and a normal temperature compensating wire therefor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3030201C2 (de) 1980-08-09 1985-06-27 Agfa-Gevaert Ag, 5090 Leverkusen Einrichtung in einer Kassette oder einem Aufnahmegerät zum Halten von Röntgenfilmen zwischen zwei Verstärkerschirmen
DE3045652C2 (de) 1980-12-04 1993-11-25 Koertvelyessy Laszlo Thermopaar aus unterschiedlich dünnen Thermodrähten
DE102004054180A1 (de) 2004-11-10 2006-05-11 Abb Technology Ag Wärmetauscher für einen Transformator
DE102006033318A1 (de) 2006-07-17 2008-01-24 Ziehl Industrie-Elektronik Gmbh + Co Vorrichtung zur Temperaturerfassung in Umgebungen mit starken elektromagnetischen Wechselfeldern und/oder an rotierenden Teilen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612779A (en) * 1950-03-22 1952-10-07 Stewart F Mulford Compensated thermocouple
GB1597409A (en) * 1978-04-28 1981-09-09 Marconi Co Ltd Thermocouples and thermocouple arrangements
US20050098201A1 (en) * 2003-11-07 2005-05-12 Kim Yong G. Pure metal thermocouple and a normal temperature compensating wire therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108469308A (zh) * 2018-07-10 2018-08-31 厦门市计量检定测试院 一种表面测温仪
CN108469308B (zh) * 2018-07-10 2023-12-12 厦门市计量检定测试院 一种表面测温仪
CN116529573A (zh) * 2020-11-30 2023-08-01 Ls电气株式会社 多通道热电偶测量装置
DE102022123631A1 (de) * 2022-09-15 2024-03-21 Temperaturmeßtechnik Geraberg GmbH Thermoelektrische Mess- und Diagnosevorrichtung

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