EP2659240A1 - Indicateur de niveau d'huile à sortie électronique - Google Patents

Indicateur de niveau d'huile à sortie électronique

Info

Publication number
EP2659240A1
EP2659240A1 EP10805429.7A EP10805429A EP2659240A1 EP 2659240 A1 EP2659240 A1 EP 2659240A1 EP 10805429 A EP10805429 A EP 10805429A EP 2659240 A1 EP2659240 A1 EP 2659240A1
Authority
EP
European Patent Office
Prior art keywords
oil level
level indicator
oil
magnet
rod
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Withdrawn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
EP10805429.7A
Other languages
German (de)
English (en)
Inventor
Carlo Carollo
Andrea Tonin
Moreno Giovanni DALLA VECCHIA
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.)
ABB Schweiz AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Publication of EP2659240A1 publication Critical patent/EP2659240A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/32—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
    • G01F23/38—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements using magnetically actuated indicating means
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • the present invention relates to an oil level indicator for oil-filled electrical power equipment.
  • the invention relates to an oil level indicator with a digital signal that can be remotely transmitted.
  • the present invention relates also to a power transformer comprising such an oil level indicator.
  • Electric power equipments containing insulating oil such as transformers and the like, usually include an oil filled expansion vessel, which is provided in order to compensate the unavoidable alterations in the volume of oil, that are created inside the equipments, due to sudden changes in temperature.
  • the oil filled expansion vessel or conservator is also supplied with air previously treated in a special dryer for eliminating or drastically reducing the humidity and in order to measure the correct values of the breakdown voltage.
  • the insulating or cooling oil flows within the oil filled expansion vessel during heating up of the electrical power apparatus and returns from the vessel to the electrical power apparatus as the temperature drops and consequently the oil contracts.
  • an oil level indicator is also used to measure the oil level in the oil filled expansion vessel and particularly in the oil filled transformer conservator.
  • Said oil level indicator is provided for checking that the transformer is well filled and also to prevent oil leakages, in case of an oil increasing and overcoming a maximum level.
  • FIG. 1 a traditional oil level indicator is shown, in which a float 1 is normally operatively connected to a float rod 2; in operation, the movements of the float 1 within the oil filled transformer conservator 3 due to variations of the oil level are converted into a rotation of the float rod 2.
  • the float rod 2 is in turn connected with a gauge disk of an electric power equipment, such as a transformer 4, by means of a magnetic joint for safety reasons; moreover, the gauge disk operates the movement in a display 5 to provide to the user a clear visualization of the oil level indication.
  • an electric power equipment such as a transformer 4
  • the magnetic joint is realized by the magnetic coupling of two sets of magnets, each set comprising for example two magnets.
  • a first set of magnets is positioned inside the conservator 3 and is operatively coupled to the float rod 2; the second set of magnets is instead positioned outside the conservator 3 together with and operatively coupled to the gauge disk.
  • the display 5 is also closed with a screen-printed disk having an indicator which rides on or over a scale and reference marks corresponding to the levels that the oil should reach at fixed temperatures.
  • a further type of oil level indicator for electrical power equipments is also known, which produces a continuous analog electric signal as a measure of the degree of the vessel filling.
  • Said oil level indicator is provided with an indicator shaft, which is placed in a display part of the unit and which is connected with a potentiometer, so that the measured state of filling of the conservator is converted into an angular displacement of the shaft of the potentiometer, thus supplying an analog signal representing the liquid (oil) level.
  • Said known oil level indicators has however some drawbacks, among which the major drawback is constituted by the fact that a direct visualization of the indicator is always needed; in other words, the oil level indicator of an oil filled conservator of electrical power equipments cannot be verified by an operator from a remote position, but only staying in front of it.
  • said drawback also causes an increase of operation costs and it is a severe obstacle to a lean manufacturing.
  • An important aim of the present invention is therefore to provide an oil level indicator for oil filled electrical power equipments with an electronic output.
  • Another aim of the present invention is to provide an oil level indicator for oil filled electrical power equipments that is more reliable and efficient than the equivalent of a known type oil level indicator.
  • a further aim of the present invention is to provide an oil level indicator for oil filled electrical power equipments making it possible to monitor the safety conditions of the power equipment in a more effective measure than the ones known to the state of the art.
  • an additional aim of the present invention is to realize an oil level indicator for oil filled electrical power equipments, which allows a simplified construction and lower manufacturing costs, with respect to the prior art.
  • the oil level indicator according to the invention enables accurate measurements of oil level in oil filled transformer conservators and, indirectly, increases the degree of safety in electrical power plants, while maintaining a high level of functional efficiency of the equipments involved.
  • the oil level indicator of the present invention is also easy to manufacture and requires low manufacturing costs with respect to the prior art.
  • FIG. 1 is a partially perspective view of a known oil level indicator used to measure the oil level in oil filled transformer conservators
  • FIG. 2 is a partially section view of a portion of an oil level indicator with electronic output for oil filled transformer conservators, according to the present invention
  • - figure 3 shows an exemplary power transformer comprising an oil level indicator according to the present invention
  • - figure 4 is a sketch schematically representing the oil level indicator according to the invention.
  • oil level indicator according to the invention will be hereinafter described by making particular reference to its use with a conservator of power transformer without intending in any way to limit its possible scope and field of application.
  • Figure 3 shows an exemplary power transformer 100 comprising a tank 10 housing the active parts of the transformer, e.g. the magnetic core and windings, and an oil-filled conservator 3.
  • An oil level indicator is operatively associated to the conservator 3, and as above discussed, it includes a float rod 2 which converts the movements of an associated float 1 within the oil filled transformer conservator 3 into a movement, e.g. a rotation, of an indicator of a signalling dial or disk 8.
  • a float rod 2 which converts the movements of an associated float 1 within the oil filled transformer conservator 3 into a movement, e.g. a rotation, of an indicator of a signalling dial or disk 8.
  • the signalling dial or disk 8 is in turn covered by a display 5 and is positioned on the opposite side of the wall of the conservator 3 with respect to the float rod 2.
  • the components of the oil-level indicator according to the invention which are positioned inside the conservator 3, e.g. the float 1 and float road 2, are operatively coupled to the components of the indicator itself which are positioned outside the conservator 3, e.g. the signalling dial or disk 8, preferably by a magnetic coupling; as previously described, also in the oil level indicator of figure 3 such magnetic coupling can be realized for instance by means of two sets of magnets, each set comprising for example two magnets.
  • a first set of magnets is positioned inside the conservator 3 and is operatively coupled to the float rod 2; the second set of magnets is instead positioned outside the conservator 3 together with and operatively coupled to the disk 8.
  • the part of the magnetic joint that is positioned outside the body of the conservator 3 is connected to an additional magnet 6, which is placed in front of an electronic board or unit 7.
  • an electronic board or unit 7 is for instance a microprocessor based circuit which is suitable to output digital signals according to solutions readily available for those skilled in the art and therefore not described herein in details.
  • a magnetic sensor 9 which is suitable for detecting variations of the magnetic field created by the magnet 6 and hence for detecting the position of the magnet 6 itself.
  • the magnetic sensor able to detect the position of the magnet 6 fixed in the magnetic joint consists of a special microchip which is sensitive to magnetic fields, and in particular to the rotation of an existing magnetic field; this electronic sensor 9 is fitted inside the electronic board 7, preferably facing the magnet 6 and being able to detect the position of the magnet 6.
  • microchip can be for example the model number AS5040 marketed by Austriamicrosystem; obviously, other similar devices or sensors can be successfully applied.
  • the magnetic sensor 9 becomes a transducer of the float rod 2 position and therefore of the float 1 position in the oil filled transformer conservator 3.
  • an oil level digital value can be thus remotely transmitted, so that said value can be checked in a safer location and can also be continuously controlled, in a reliable and efficient way, by an operator.
  • Another object of the present invention encompasses a power transformer comprising at least one oil level indicator of the type previously described and as defined in the appended claims.
  • the local disk or dial can be prevented or can be replaced by any other equivalent local indicator of level and the coupling between the components which are positioned inside the conservator and those placed outside can be realized differently from a magnetic way, provided it is in line with functionality required and safety rules.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

L'invention concerne un indicateur de niveau d'huile comprenant un flotteur fixé à une tige, l'ensemble pouvant se déplacer à l'intérieur d'un récipient rempli d'huile d'un équipement énergétique associé. Un aimant est fixé à la tige et un capteur magnétique se trouve en face de l'aimant (6) pour détecter un changement ou une variation du champ magnétique produit par l'aimant lorsque le flotteur (1) et la tige (2) se déplacent en raison du changement du niveau d'huile à l'intérieur du récipient. Le capteur magnétique comprend un circuit intégré installé sur une carte électronique (7), ce qui permet d'obtenir une sortie numérique indiquant le changement de niveau d'huile à l'intérieur du récipient.
EP10805429.7A 2010-12-27 2010-12-27 Indicateur de niveau d'huile à sortie électronique Withdrawn EP2659240A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/070757 WO2012089235A1 (fr) 2010-12-27 2010-12-27 Indicateur de niveau d'huile à sortie électronique

Publications (1)

Publication Number Publication Date
EP2659240A1 true EP2659240A1 (fr) 2013-11-06

Family

ID=44546344

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10805429.7A Withdrawn EP2659240A1 (fr) 2010-12-27 2010-12-27 Indicateur de niveau d'huile à sortie électronique

Country Status (3)

Country Link
EP (1) EP2659240A1 (fr)
CN (1) CN103270398A (fr)
WO (1) WO2012089235A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988001046A1 (fr) * 1986-07-28 1988-02-11 Qualitrol Corporation Systeme de detection du niveau d'un liquide a effet hall
JP2004226116A (ja) * 2003-01-20 2004-08-12 Calsonic Kansei Corp 磁気式液面検出装置
MXNL06000005A (es) * 2006-01-25 2006-04-05 Juan Oscar Rodroguez Medina Metodo, sistema y aparatos para medir el volumen de un liquido contenido en un tanque.
CN200950075Y (zh) * 2006-09-19 2007-09-19 关庆罡 可远距离传输数据的变压器油位计
CN201017241Y (zh) * 2007-01-08 2008-02-06 李钦 智能液位监控器
US20100294037A1 (en) * 2009-05-21 2010-11-25 Deleo David Gauge assembly and methods of using same
CN201503299U (zh) * 2009-10-09 2010-06-09 沈阳海业电力设备有限公司 变压器储油柜用模拟信号输出式油位计
CN201548292U (zh) * 2009-10-26 2010-08-11 浙江湖州新京昌电子有限公司 非接触式油位传感器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012089235A1 *

Also Published As

Publication number Publication date
WO2012089235A1 (fr) 2012-07-05
CN103270398A (zh) 2013-08-28

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