DE102005020809B3 - Capacitive sensor for detecting oil level, especially insulating oil for electrical operating arrangements, has measurement electrode on inner measurement gap wall, insulated guard electrodes, electrical heating coil in outer housing wall - Google Patents
Capacitive sensor for detecting oil level, especially insulating oil for electrical operating arrangements, has measurement electrode on inner measurement gap wall, insulated guard electrodes, electrical heating coil in outer housing wall Download PDFInfo
- Publication number
- DE102005020809B3 DE102005020809B3 DE200510020809 DE102005020809A DE102005020809B3 DE 102005020809 B3 DE102005020809 B3 DE 102005020809B3 DE 200510020809 DE200510020809 DE 200510020809 DE 102005020809 A DE102005020809 A DE 102005020809A DE 102005020809 B3 DE102005020809 B3 DE 102005020809B3
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- DE
- Germany
- Prior art keywords
- wall
- sensor according
- sensor
- housing
- measuring
- 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.)
- Expired - Fee Related
Links
- 238000005259 measurement Methods 0.000 title abstract description 14
- 238000010438 heat treatment Methods 0.000 title abstract description 4
- 239000012212 insulator Substances 0.000 claims abstract description 7
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 229920002530 polyetherether ketone Polymers 0.000 claims description 7
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 23
- 239000003990 capacitor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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
Landscapes
- 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
Description
Die Erfindung betrifft einen kapazitiven Sensor zur Erfassung des Ölzustandes, insbesondere des Ölzustandes von Isolierölen elektrischer Betriebsmittel.The The invention relates to a capacitive sensor for detecting the oil condition, especially the oil condition of insulating oils electrical equipment.
Ein kapazitiver Sensor eignet sich prinzipiell für die Erfassung jeder nichtelektrischen Größe, die sich auf eine Änderung des Dielektrikums zurückführen lässt; ein solcher Sensor ist somit auch für die Messung der Ölqualität, die ebenfalls durch die Dielektrizitätskonstante des Öls gekennzeichnet ist, anwendbar.One Capacitive sensor is suitable in principle for the detection of any non-electrical Size that is on a change attributed to the dielectric; one such sensor is therefore also for the measurement of oil quality, too by the dielectric constant of the oil is applicable, applicable.
Aus WO 2004/109269 ist bereits ein solcher kapazitiver Sensor zur Erfassung des Ölzustandes bekannt. Er besitzt eine Sensorzelle, die von einem Außenrohr umgeben ist. Die Sensorzelle selbst weist einen Füllstandssensor und, unabhängig davon, einen Ölqualitätssensor auf. Das Außenrohr wird in das zu untersuchende Öl eingetaucht; das Öl füllt dabei einen zwischen Sensorzelle und Außenrohr bestehenden Innenraum aus. Das Außenrohr weist an seiner Innenseite eine konzentrische Gegenelektrode für die kapazitive Messung mit der an der Außenseite der Sensorzelle angebrachten Kondensatorfläche des Ölqualitätssensors auf. Dieser bekannte kapazitive Sensor ist für die Anwendung in Motoren, Getrieben sowie Hydrauliksystemen vorgesehen.Out WO 2004/109269 already has such a capacitive sensor for detection the oil state known. It has a sensor cell surrounded by an outer tube. The sensor cell itself has a level sensor and, independently of which, an oil quality sensor on. The outer tube gets into the oil to be examined immersed; the oil fills one between sensor cell and outer tube existing interior. The outer tube has on its inside a concentric counter electrode for the capacitive measurement with on the outside of the Sensor cell attached capacitor surface of the oil quality sensor on. This well-known Capacitive sensor is for the application in engines, transmissions and hydraulic systems provided.
Ein Nachteil dieses bekannten Sensors besteht darin, dass das Messergebnis stark temperaturabhängig ist, da sich die Dielektrizitätskonstante des untersuchten Öles mit der Temperatur ändert. Für die Ermittlung der Ölqualität ölgefüllter elektrischer Betriebsmittel, z. B. des Isolieröles von Leistungstransformatoren, die in Betrieb eine stark schwankende, u. a. von der jeweiligen elektrischen Belastung und der gewählten Kühlungsart des jeweiligen Transformators abhänge Temperatur aufweisen können, ist der bekannte Sensor nicht geeignet. Ein weiterer Nachteil des bekannten Sensors besteht in der Abhängigkeit des Messergebnisses von der Impedanz des Öls und damit dem Verlustfaktor tanδ.One Disadvantage of this known sensor is that the measurement result strongly dependent on temperature is because the dielectric constant of the examined oil with the temperature changes. For the investigation Oil quality oil filled electric Resources, eg. B. the insulating oil of power transformers, the in operation a strongly fluctuating, u. a. from the respective electrical load and the selected type of cooling of the respective transformer depended Temperature can have the known sensor is not suitable. Another disadvantage of known sensor consists in the dependence of the measurement result from the impedance of the oil and thus the loss factor tanδ.
Aufgabe der Erfindung ist es demnach, einen kapazitiven Sensor vorzustellen, bei dem die Temperaturabhängigkeit des Messergebnisses ebenso wie der Einfluss von dem Verlustfaktor tanδ bei einfachem konstruktivem Aufbau eliminiert sind.task The invention is therefore to present a capacitive sensor, where the temperature dependence the result of the measurement as well as the influence of the loss factor tanδ at simple constructive structure are eliminated.
Diese Aufgabe wird durch einen Sensor mit den Merkmalen des ersten Patentanspruches gelöst. Die Unteransprüche betreffen besonders vorteilhafte Weiterbildungen der Erfindung.These The object is achieved by a sensor having the features of the first claim solved. The under claims relate to particularly advantageous developments of the invention.
Die Erfindung geht von einem Sensor aus, der in Form eines kapazitiven Spannungsteilers ausgeführt ist, wobei die Messung gegen Masse erfolgt.The Invention is based on a sensor in the form of a capacitive Voltage divider executed is, wherein the measurement is made to ground.
Nach einem weiteren Merkmal der Erfindung ist beim erfindungsgemäßen Sensor eine elektrische Heizung vorgesehen, die geregelt ist und sicherstellt, dass die Temperatur zwischen den Messelektroden konstant gehalten ist und damit das Messergebnis nicht mehr von der jeweiligen Temperatur des Öles abhängt.To Another feature of the invention is the sensor according to the invention An electric heater is provided which is regulated and ensures that the temperature between the measuring electrodes is kept constant and thus the measurement result no longer of the respective temperature of the oil.
Durch den konstruktiven Aufbau des erfindungsgemäßen Sensors konnte der störende Einfluss des Verlustfaktors tanδ auf das Messergebnis vermieden werden.By the structural design of the sensor according to the invention could disturbing influence of the loss factor tanδ the measurement result can be avoided.
In
einer besonders vorteilhaften Ausführungsform der Erfindung sind
die Elektroden des Sensors und die Heizung vollständig in
einen sowohl trafoölbeständigen als
auch temperaturbeständigen Kunststoff
eingebettet. Solche geeigneten Kunststoffe können beispielsweise PTFE oder
auch PEEK sein. PEEK steht dabei für das Material des teilkristallinen
Thermoplast Polyether-Etherketon. Dieses Polyetheretherketon mit
der chemischen Formel
Es hat sich überraschend gezeigt, dass durch die beschriebene Einbettung in einen geeigneten Kunststoff am erfindungsgemäßen Sensor der störende Einfluss der Impedanz über den Verlustfaktor tanδ des Öles beseitigt werden kann. Ein solcher Kunststoff ermöglicht zudem eine besonders glatte, homogene und isolierende Oberfläche, die z. B. durch Aufsputtern oder Lackieren erzeugt werden kann.It has been surprising shown that by embedding described in a suitable Plastic on the sensor according to the invention the disturbing Influence of the impedance over eliminated the loss factor tanδ of the oil can be. Such a plastic also allows a special smooth, homogeneous and insulating surface, the z. B. by sputtering or painting can be produced.
Die Erfindung soll nachfolgend an Hand von Zeichnungen beispielhaft noch näher erläutert werden.The Invention will be described by way of example with reference to drawings even closer explained become.
Die Figuren zeigen:The Figures show:
Der
erfindungsgemäße Sensor
besteht beispielsweise aus einem äußeren, rohrförmigen Gehäuse
Das
Gehäuse
Es
ist also zu sehen, dass beim beschriebenen Ausführungsbeispiel die Bauteile
konzentrisch um einander herum angeordnet sind, wobei, wie beschrieben,
die beiden Guardelektroden
Der erfindungsgemäße Sensor gestattet damit eine temperaturunabhängige Erfassung der relativen Dielektrizitätskonstante als Maß für den Zustand des Öles, d. h. seine (dielektrischen) Isoliereigenschaften. Weiterhin ist beim erfindungsgemäßen Sensor der störende Einfluss des Verlustfaktors tanδ eliminiert. Der Sensor besitzt ein stabiles Messsignal in ausreichender Amplitude; typische Werte sind eine Betriebstemperatur von 75 Grad C, eine Kapazität der Sensoranordnung von 1,8 pF bei einer Frequenz von 35 kH.The sensor according to the invention allows with a temperature-independent detection of the relative dielectric constant as a measure of the state of the oil, ie its (dielectric) insulating properties. Furthermore, the disturbing influence of the loss factor tanδ 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.
Claims (10)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510020809 DE102005020809B3 (en) | 2005-05-04 | 2005-05-04 | Capacitive sensor for detecting oil level, especially insulating oil for electrical operating arrangements, has measurement electrode on inner measurement gap wall, insulated guard electrodes, electrical heating coil in outer housing wall |
PCT/EP2006/001401 WO2006117033A1 (en) | 2005-05-04 | 2006-02-16 | Capacitive sensor for recording oil level with guard electrode and heating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510020809 DE102005020809B3 (en) | 2005-05-04 | 2005-05-04 | Capacitive sensor for detecting oil level, especially insulating oil for electrical operating arrangements, has measurement electrode on inner measurement gap wall, insulated guard electrodes, electrical heating coil in outer housing wall |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102005020809B3 true DE102005020809B3 (en) | 2006-10-19 |
Family
ID=36117379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200510020809 Expired - Fee Related DE102005020809B3 (en) | 2005-05-04 | 2005-05-04 | Capacitive sensor for detecting oil level, especially insulating oil for electrical operating arrangements, has measurement electrode on inner measurement gap wall, insulated guard electrodes, electrical heating coil in outer housing wall |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102005020809B3 (en) |
WO (1) | WO2006117033A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011107006A1 (en) * | 2011-07-09 | 2013-01-10 | Maschinenfabrik Reinhausen Gmbh | thermometer |
DE102015200203A1 (en) * | 2015-01-09 | 2016-07-14 | Zf Friedrichshafen Ag | Measuring arrangement for detecting foreign particles in a medium |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6476810B2 (en) * | 2014-12-10 | 2019-03-06 | ダイキン工業株式会社 | Compressor preheating device |
JP6924106B2 (en) * | 2017-09-11 | 2021-08-25 | Kyb株式会社 | Fluid property detector |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004109269A1 (en) * | 2003-06-04 | 2004-12-16 | Conti Temic Microelectronic Gmbh | Method for producing a component, especially an oil state sensor, and component produced according to one such method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9709290D0 (en) * | 1997-05-07 | 1997-06-25 | Collister Christopher J | Electrical measurement apparatus for oil |
GB2364777B (en) * | 2000-07-12 | 2004-10-13 | Sondex Ltd | An improved capacitance measurement probe |
US6781388B2 (en) * | 2001-09-26 | 2004-08-24 | Delphi Technologies, Inc. | Liquid property sensor |
US6847216B2 (en) * | 2003-04-28 | 2005-01-25 | Detroit Diesel Corporation | Method and apparatus for stabilizing parasitic error capacitance in oil quality sensors |
-
2005
- 2005-05-04 DE DE200510020809 patent/DE102005020809B3/en not_active Expired - Fee Related
-
2006
- 2006-02-16 WO PCT/EP2006/001401 patent/WO2006117033A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004109269A1 (en) * | 2003-06-04 | 2004-12-16 | Conti Temic Microelectronic Gmbh | Method for producing a component, especially an oil state sensor, and component produced according to one such method |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011107006A1 (en) * | 2011-07-09 | 2013-01-10 | Maschinenfabrik Reinhausen Gmbh | thermometer |
DE102011107006B4 (en) * | 2011-07-09 | 2015-06-11 | Maschinenfabrik Reinhausen Gmbh | thermometer |
DE102015200203A1 (en) * | 2015-01-09 | 2016-07-14 | Zf Friedrichshafen Ag | Measuring arrangement for detecting foreign particles in a medium |
Also Published As
Publication number | Publication date |
---|---|
WO2006117033A1 (en) | 2006-11-09 |
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Date | Code | Title | Description |
---|---|---|---|
8100 | Publication of the examined application without publication of unexamined application | ||
8364 | No opposition during term of opposition | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |