EP2669909A1 - Druckentlastungsvorrichtung für einen Stromtransformator und zugehöriger Stromtransformator - Google Patents

Druckentlastungsvorrichtung für einen Stromtransformator und zugehöriger Stromtransformator Download PDF

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Publication number
EP2669909A1
EP2669909A1 EP12170509.9A EP12170509A EP2669909A1 EP 2669909 A1 EP2669909 A1 EP 2669909A1 EP 12170509 A EP12170509 A EP 12170509A EP 2669909 A1 EP2669909 A1 EP 2669909A1
Authority
EP
European Patent Office
Prior art keywords
pressure relief
relief device
valve element
pressure
tank
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Withdrawn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
EP12170509.9A
Other languages
English (en)
French (fr)
Inventor
Andrea Tonin
Carlo Carollo
Emanuele Ramponi
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 Technology 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
Priority to EP12170509.9A priority Critical patent/EP2669909A1/de
Publication of EP2669909A1 publication Critical patent/EP2669909A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present disclosure relates to a pressure relief device suitable to be connected to a power transformer, and to a power transformer comprising such a pressure relief device.
  • power transformers generally comprise a magnetic core composed by one or more legs or limbs connected by yokes which all together form one or more core windows; for each phase, around the legs there are arranged a number of windings, i.e. low-voltage windings, high-voltage windings, control or regulation windings.
  • a power transformer comprises usually a closed tank or vessel which is filled with an insulating fluid, e.g. a mineral oil, used as a coolant for the components of the transformer.
  • an insulating fluid e.g. a mineral oil
  • pressure relief devices are used which are designed to discharge the over-pressure outside the tank into the surrounding atmosphere.
  • Known pressure relief devices are usually connected to a wall of the transformer tank, e.g. on top of the tank, and are available in numerous and various constructive solutions.
  • a pressure relief device suitable to be connected to a power transformer comprising a tank filled with an insulating fluid, the pressure relief device comprising a shaped body having:
  • Figures 1 , 2 and 5 show exemplary embodiments of a pressure relief device according to the present disclosure globally indicated by the reference number 100; the pressure relief device 100 is suitable to be connected to a power transformer, for example to the tank or casing of the transformer, as shown schematically in figure 2 wherein a top wall of a tank is schematically represented by the reference number 101.
  • the pressure relief device 100 can be connected to any other suitable part or wall of the transformer or to any other component thereof, such as for example an on-load tap changer.
  • the pressure relief device 100 has a shaped body comprising several parts mutually assembled to each other in the way that will be described hereinafter.
  • the shaped body comprises a connection flange 1 provided with a through opening 2; the connection flange 1 is suitable to be connected to the tank, e.g. to the top wall 101 of the tank, by means of securing means e.g. screws and/or studs 102, as schematically illustrated for instance in figure 1 and in the way that will be described in more details hereinafter.
  • the shaped body of the pressure relief device 100 comprises an end or abutment cap 3 which is spaced apart from the connection flange 1, e.g. above the connection flange 1 and externally with respect to the tank of the transformer; in the exemplary embodiment illustrated, the end cap 3 has a substantially circular, cup-shaped configuration.
  • the pressure relief device 100 further comprises a valve element 4 which comprises, as for example illustrated in figure 3 , a substantially disk-like body (seen in top or plan view) and is positioned displaceable between the connection flange 1 and the end cap 3; the valve element 4 is displaceable between a first position where it is suitable to at least partially close the through opening 2 (closed position illustrated in figure 1 ) and a second position where it is spaced away from the through opening 2 (open position) so as to allow venting outside the tank of any dangerous overpressure occurring for whatever reason inside the tank itself.
  • the pressure relief device 100 comprises at least one elastic element 5, e.g.
  • the device 100 is provided with suitable gaskets 103 according to solutions well known to those skilled in the art and therefore not described herein in details.
  • the pressure relief device 100 is shown provided with two elastic elements, i.e. two springs 5 and 6, e.g. two compression springs, which are for instance positioned concentrically to each other; each spring 5, 6, has one end which is operatively connected to the end cap 3 and is placed within the concavity of its cup-shaped body, and the other end which is operatively connected to the valve element 4 so as to urge it towards the connection flange 1 for closing its though opening 2.
  • each spring 5, 6 has one end which is operatively connected to the end cap 3 and is placed within the concavity of its cup-shaped body, and the other end which is operatively connected to the valve element 4 so as to urge it towards the connection flange 1 for closing its though opening 2.
  • the body of the device 100 comprises also an intermediate cover 8 positioned above the end cap 3, and an outer cover 9 which is positioned over the intermediate cover 8; the intermediate cover 8 and the outer cover 9 delimit an inside closed space 31 inside which it is possible to house components, such as electric cables, terminal, switches, et cetera.
  • the pressure relief device 100 comprises a pressure transducer 200 which is positioned inside the shaped body of the device 100 itself and is adapted to continuously sense the pressure inside said tank.
  • the pressure transducer 200 is positioned at the connection flange 1 and is in operative communication with the inside of the tank 101.
  • the pressure relief device 100 comprises a sleeve 201 which is operatively connected to the valve element 4 at a central portion thereof; the pressure transducer 200 is positioned inside the sleeve 201 and is in operative communication with the inside of the tank 101.
  • the pressure transducer 200 can be fitted inside the concentric springs 5 and 6; in addition, it would be possible to fit inside the springs 5, 6 also the electronic board.
  • the pressure transmitter 200 is adapted to convert the pressure sensed into corresponding electronic signals.
  • the pressure relief device 100 comprises an electrical box 30 containing an electronic board which receives the electronic signals output by the pressure transmitter 200.
  • An electronic board can be also in addition/or in alternative placed remotely from the device 100 and can receive the signals from the pressure transmitter 200.
  • the body of the device 100 can be provided also with a lateral sleeve 32 which can be realized in a unique piece together with the intermediate cover 8 or can be mechanically connected therewith. The lateral sleeve 32 allows oil leaking outside the tank 101.
  • connection means indicated by the overall reference number 10, which are arranged so as to guide the valve element 4 along a predetermined path when the valve element 4 itself moves between the first closed position and the second position, in both directions.
  • connection means 10 comprise, according to the exemplary embodiments illustrated in the attached figures, first connection means which mechanically connect the connection flange 1 with the end cap 3 and second connection means operatively connecting the valve element 4 with the first connection means, in the way that will be described hereinafter.
  • the first connection means 10 comprise a plurality of substantially rectilinear studs 11, for instance four studs 11; each stud 11 has one end portion 12 which is inserted into a corresponding hole provided on the connection flange 1 and is connected to the flange 1 by means of securing means, e.g. a fixing screw 102. A second end portion 13 of each stud 11 is connected to the end cap 3, by means of other securing means, e.g. a further screw 102.
  • the second connection means comprise for instance a plurality of sleeves 14 and a plurality of seats 15 which are provided on the body of the valve element 4; in particular, as illustrated in more details in figure 3 , the seats 15 are placed at the outer rim of the disk-like body of the valve element 4 and are open outwardly; in practice they protrude outwardly from the circumference of the disk-like body.
  • the plurality of seats 15 comprises four seats 15, namely a first seat and a second seat which are positioned substantially symmetrically to each other with respect to the center 104 of the disk-like body, and a third seat and a fourth seat which are also positioned substantially symmetrically to each other with respect to the center 104 of said disk-like body.
  • the four seats 15 are placed at the ends of two perpendicular diameters 21, 22 of the disk-like body of the valve element 4, according to a solution which allows a substantially symmetric distribution of mechanical stresses.
  • Each seat 15 is adapted to receive a corresponding sleeve 14 which is inserted therein with a mechanical clearance; alternatively the sleeves 14 could be force-fitted into the respective seats 15.
  • each sleeve 14 of the plurality of sleeves 14 comprises a central portion and two end portions 16, 17 which protrude transversely from the central portion.
  • Each sleeve 14 and the correspondingly associated seat 15 are sized relatively to each other so as when a sleeve 14 is fitted into the corresponding seat 15, the two end portions 16-17 rest and abut each on a corresponding surface 18, 19 of the valve element 4, respectively. In this way, the sleeves 14 and the valve element 4 are rigidly connected to each other and substantially move together as a unique body.
  • each stud 11 is inserted and passes through an associated sleeve 14; in particular, each stud 11 is inserted into the associated sleeve 14 with a small mechanical clearance left there between so as to allow the movement of the valve element 4 relative to the studs 11 themselves (and hence relative to the end cap 3 and connection flange 1 as well which are rigidly connected with the studs 11).
  • connection means can comprise a plurality of through holes 20 provided on the body of the valve element 4; in this case the sleeves 15 can be omitted and each stud 11 of the plurality of studs 11 can be inserted and passed through an associated through hole 20 of the plurality of through holes 20.
  • each stud 11 is inserted into the corresponding through hole 20 with a small mechanical clearance there between, so as to allow the movement of the valve element 4 relative to the studs 11 and therefore relative to the end cap 3 and connection flange 1 as well.
  • the plurality of through holes 20 comprises four through holes 20, namely a first hole and a second hole which are positioned substantially symmetrically to each other with respect to the center 104 of the disk-like body, and a third through hole and a fourth through hole which are also positioned substantially symmetrically to each other with respect to the center 104 of said disk-like body.
  • the four through holes 20, likewise the four seats 15, are placed at or close to the ends of two perpendicular diameters 21, 22 of the disk-like body of the valve element 4.
  • valve element 4 In practice, in normal operating conditions, the valve element 4 is urged by the springs 5, 6 toward the connection flange 1 and closes the through opening 2.
  • the pressure transducer 200 senses continuously the pressure inside the tank 101 and corresponding digital signals are received by the electronic board. Such communication can be executed for example according to MODBUS protocol and by means of an RS 485 connection type.
  • valve element 4 If for whatever reason the pressure inside the tank increases and reaches a level sufficient enough to overcome the urging force of the springs 5-6, the valve element 4 is moved away by such overpressure towards the end cap 3; during this displacement, the movement of the valve element 4 is guided by the coupling studs 11-sleeves 14 along a predetermined and always the same path, i.e. in the exemplary embodiment illustrated along a rectilinear path. In this way, when the through opening 2 is open, fluids coming from the inside of the tank, e.g. gases or even quantities of the coolant liquid are vented/discharged outside, e.g.
  • the pressure relief device 100 according to the present disclosure offers a solution which is rather simple, reliable, and allows monitoring the pressure inside the tank. Such results are achieved thanks to a simple solution which makes the pressure relief device 100 according to the present disclosure easy to be used in connection with any type of power transformer, or even components of or for power transformers, such as on-load tap changers, where such safety devices are advisable.
  • the present disclosure also encompasses a power transformer comprising at least one pressure relief device 100 of the types previously described and as defined in the appended claims.
  • a pressure relief device 100 of the types previously described and as defined in the appended claims.
  • more than one pressure relief device can be used in a single power transformer.
  • the pressure relief device 100 thus conceived is susceptible of modifications and variations, all of which are within the scope of the inventive concept as defined in particular by the appended claims; any possible combination of the previously disclosed embodiments can be implemented and has to be considered within the inventive concept of the present disclosure; all the details may furthermore be replaced with technically equivalent elements.
  • any of the previously described components may be differently shaped, or used in a different number or parts or elements, or the components previously described can be differently connected with respect to each other.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Safety Valves (AREA)
EP12170509.9A 2012-06-01 2012-06-01 Druckentlastungsvorrichtung für einen Stromtransformator und zugehöriger Stromtransformator Withdrawn EP2669909A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12170509.9A EP2669909A1 (de) 2012-06-01 2012-06-01 Druckentlastungsvorrichtung für einen Stromtransformator und zugehöriger Stromtransformator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12170509.9A EP2669909A1 (de) 2012-06-01 2012-06-01 Druckentlastungsvorrichtung für einen Stromtransformator und zugehöriger Stromtransformator

Publications (1)

Publication Number Publication Date
EP2669909A1 true EP2669909A1 (de) 2013-12-04

Family

ID=46229261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12170509.9A Withdrawn EP2669909A1 (de) 2012-06-01 2012-06-01 Druckentlastungsvorrichtung für einen Stromtransformator und zugehöriger Stromtransformator

Country Status (1)

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EP (1) EP2669909A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313974A (en) * 1993-02-03 1994-05-24 Impacto Enterprises, Inc. Pipeline pressure release apparatus and method
US20060260694A1 (en) * 2003-03-19 2006-11-23 Rainer Brill Decompression valve
US20100058880A1 (en) * 2006-06-29 2010-03-11 Qinetiq Limited Valve test method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313974A (en) * 1993-02-03 1994-05-24 Impacto Enterprises, Inc. Pipeline pressure release apparatus and method
US20060260694A1 (en) * 2003-03-19 2006-11-23 Rainer Brill Decompression valve
US20100058880A1 (en) * 2006-06-29 2010-03-11 Qinetiq Limited Valve test method and apparatus

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