EP2930726A1 - Installation de déshydratation d'huile - Google Patents

Installation de déshydratation d'huile Download PDF

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Publication number
EP2930726A1
EP2930726A1 EP14163853.6A EP14163853A EP2930726A1 EP 2930726 A1 EP2930726 A1 EP 2930726A1 EP 14163853 A EP14163853 A EP 14163853A EP 2930726 A1 EP2930726 A1 EP 2930726A1
Authority
EP
European Patent Office
Prior art keywords
oil
transformer
control device
oil drying
return line
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Withdrawn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
EP14163853.6A
Other languages
German (de)
English (en)
Inventor
Georg Becker
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to EP14163853.6A priority Critical patent/EP2930726A1/fr
Publication of EP2930726A1 publication Critical patent/EP2930726A1/fr
Withdrawn legal-status Critical Current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
    • H01F27/08—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 invention relates to an oil drying plant for transformers, which continuously dries oil of the transformer during continuous operation of a transformer.
  • the oil serves on the one hand the electrical insulation, on the other hand, the cooling.
  • the insulation consists of solid cellulosic insulating materials such as paper.
  • the water content of the solid and liquid insulating materials influence the dielectric strength and the aging behavior. A higher water content causes a faster aging and thus a shorter life of the transformer.
  • a - usually mobile - oil drying plant is connected to the transformer at regular intervals and dries the oil to a specified degree. Thereafter, the oil drying system is removed again.
  • Oil drying systems are often connected to the transformer with several meters of cables. In the event of a leak in the line, the oil of the transformer can now leak unnoticed, especially in the case of continuously operating oil drying systems installed at remote locations, which ultimately leads to its disconnection and thus to the failure of the connected power grids.
  • the object of the present invention is to detect the occurrence of such a leak.
  • Such an inventive oil drying plant for a transformer has an oil drying device, is dried by the supplied from the transformer oil.
  • a supply line for oil to be dried is connected at a first end to an inlet of the oil drying device and has a second end which is connectable to a first oil connection of the transformer.
  • a dried oil return line is connected at a first end to an outlet of the oil drying device and has a second end connectable to a second oil port of the transformer.
  • the control device is configured to determine a leak in the supply line or the return line, hereinafter also referred to as lines, by comparing the measured values with reference values stored in the control device.
  • the reference value is preferably determined individually for each of the measuring devices, but may also be defined jointly for all measuring devices. It is specified, for example, when commissioning the oil drying system and stored in the control device. Alternatively, the reference value can be determined by the control device. For example, the control device could calculate a first reference value for each measuring device a certain time after commissioning by averaging the measured values transmitted by the measuring devices over a specific period of time. The reference value (s) may also be continuously adjusted during operation to bring about long-term changes, for example, by extending the oil to the transformer by solar radiation. Thus, for example, the reference values could be regularly adjusted as the moving average of a plurality of measuring values of the measuring devices which are separated in time. However, there is a risk that small leaks will go undetected. This risk could be counteracted by setting threshold values for the reference values whose overshoot or undershoot is also interpreted as a leak and signaled accordingly.
  • the control device interprets this as a leak occurring in one of the lines. This can then be displayed or reported to a control center. Thus, the leak can be corrected before it leads to a shutdown of the transformer due to lack of oil.
  • the supply line and the return line can each be connected to the transformer by means of a connection piece.
  • the connection pieces each have a solenoid valve connected to the control device.
  • the control device is designed such that the solenoid valves are closed in the event of a leak.
  • the fittings have a fitting, for example, a flange, a screw or plug connector, by means of which the supply or return line can be connected to a corresponding fitting on the oil connection.
  • a respective solenoid valve is arranged in the supply and return line.
  • the solenoid valve integrated in the valve is particularly advantageous.
  • the first and second measuring devices used are a pressure gauge for measuring the oil pressure in the pipe, a flow meter for measuring the volume flow of oil in the pipe, or a flow meter for measuring the flow rate of oil in the pipe.
  • similar or different measuring methods can be used as the first and second measuring device.
  • monitors are considered, so for example pressure monitor, which signal only the exceeding or falling below an adjustable threshold to the controller ,
  • a leak monitoring can thus be realized with inexpensive and readily available standard components.
  • the first measuring device is arranged in the supply line near the entrance. As a result, a particularly efficient leak monitoring of the supply line is ensured.
  • the second measuring device is arranged in the return line near the connection piece. This ensures a particularly efficient leak monitoring of the return line.
  • a arranged in the supply line or the return line pump is designed to drive an oil flow through the oil drying system, wherein the control device is configured such that in a detected leak, the pump is turned off.
  • the pump is arranged in the supply line and the first measuring device is arranged between the pump and the input. Switching off the pump prevents a leak that has occurred and prevents further oil from being transported out of the leak by the pump.
  • the single figure shows a schematic representation of an inventive oil drying plant 1, which is connected to a transformer 20.
  • the oil drying plant 1 has an oil drying device 2.
  • This consists essentially of one or more, here three, cartridges 19, which are filled with a desiccant, which extract water from the oil. Often these are zeolites or molecular sieves.
  • the cartridges 19 are connected to each other with connecting lines, so that they, as shown, successively or also in parallel flows through an oil flow. In the illustration shown, adjacent cartridges 19 are flowed through in the opposite direction. Alternatively, the cartridges 19 can also be flowed through in the same direction.
  • the oil drying device 2 has an inlet 4, at which the oil drying device 2 is supplied to be dried oil, and an outlet 5, at which the dried oil leaves the oil drying device 2. Input 4 and output 5 can usually be closed with a tap.
  • the input 4 is connected by means of a feed line 3 to a first oil connection 6 of the transformer 20.
  • the output 8 is connected by means of a return line 7 to a second oil connection 10 of the transformer 20.
  • the oil connections 6, 10 may be formed as nozzles or flanges.
  • the supply line 3 and the return line 7 have for connection to the transformer 20 each have a connection piece 5, 9, each with a connection fitting 17, 18.
  • the connection fittings may be, for example, flanges, screw or plug connectors, by means of which the supply or return line 3, 7 can be connected to a corresponding fitting on the oil connection 6, 10.
  • a pump 11 is arranged in the supply line 3 and drives an oil flow from the transformer 20 via the supply line 3, through the oil drying device 2 and via the return line 7 back into the transformer 20th
  • a first measuring device 13 for example a pressure gauge, is arranged in the feed line 3.
  • the first measuring device 13 continuously or at fixed intervals measures a physical quantity of the oil flow in the supply line 3, for example the oil pressure, and transmits this to a control device 12.
  • a second measuring device 14 is arranged in the return line 7 near or in the connector 9. This measures a physical quantity of the oil flow in the return line 7 and transmits it to the control device 12.
  • solenoid valves 15, 16 are arranged, which are connected to the control device 12, and can be opened or closed to a signal from the latter.
  • each electrically operable valve is understood.
  • the solenoid valves are preferably designed so that they are closed in de-energized state.
  • the oil dryer may include other devices such as humidity sensors, breathers, filters, and sampling devices.
  • the first and second measuring devices 13, 14 are pressure gauges.
  • the first and second measuring devices 13, 14 are pressure gauges.
  • the first and second measuring devices 13, 14 are pressure gauges.
  • the oil drying apparatus 2 When the oil drying plant 1 is supplied to the location of the transformer 20, the oil drying apparatus 2 is usually already filled with a transformer oil.
  • the taps at the entrance 4 and exit 8 are closed.
  • the supply line 3 and the return line 7 are first connected to the input 4 and to the output 8 and then to the oil connections 6, 10 of the transformer 20.
  • usually first blind flanges have to be removed at the oil connections 6, 10 and replaced by flanges with connection fittings.
  • the taps at the entrance 4 and exit 8 are now opened.
  • the controller 12 the solenoid valves 15, 16 are also opened.
  • the air is now first removed from the supply line 3 and the return line 7. This process can be accelerated by switching on the pump 11.
  • the control device is switched to a setting mode. In this case, if not done, the pump 11 is turned on and waited until a steady state pressure has set. This can be controlled by the pressure measured by the pressure gauges 13, 14 being indicated by a display of the control device 12. If a stationary pressure has been established after about three to five minutes, the pressures measured by the two pressure gauges 13, 14 are stored as reference values in the control device 12. The pressure P1 of the first pressure gauge 13 will be higher than the pressure P2 of the second pressure gauge 14, since a pressure loss occurs through the oil drying device 2. A typical pressure for P1 is 0.5 bar to 2 bar. The pressure P2 depends on the type and size of the oil drying device 2. For the example it is assumed that the pressure P1 is 1 bar, the pressure P2 is 0.4 bar.
  • a difference value D is already stored, which signals a leak as a deviation from the reference value, or is set in relation to the individual circumstances of the oil drying plant 1.
  • the difference value D may be the same or different for both pressure gauges 13, 14.
  • the difference value D1 for the first pressure gauge 13 will usually be between 5% and 20% of the pressure P1.
  • the difference values D1 and D2 must be chosen large enough so that pressure fluctuations occurring during normal operation are not erroneously interpreted as a leak, but small enough for a leak to be detected in good time.
  • the setting mode is completed and the oil drying system 1 is switched via the control device 12 in an automatic mode.
  • the control device monitors continuously or at intervals the pressures measured by the pressure gauges 13, and 14 and compares them with the reference values. If the value M1 ⁇ P1 - D1 measured by the first pressure gauge 13 applies, this is interpreted by the control device 12 as a leak in the feed line 3. If the value M2 ⁇ P2-D2 measured by the second pressure gauge 13 is valid, this is interpreted by the control device 12 as a leak in the return line 7. If one of these cases occurs, the controller switches to an alarm mode. The solenoid valves 6, 10 are closed and the pump 11 is turned off. Additionally or alternatively, a corresponding alarm message can be sent to a control center. The control device 12 can only be put back into the automatic mode by the control center or a technician on site if it has either been determined that there is actually no leak or this has been remedied.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Drying Of Solid Materials (AREA)
EP14163853.6A 2014-04-08 2014-04-08 Installation de déshydratation d'huile Withdrawn EP2930726A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14163853.6A EP2930726A1 (fr) 2014-04-08 2014-04-08 Installation de déshydratation d'huile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14163853.6A EP2930726A1 (fr) 2014-04-08 2014-04-08 Installation de déshydratation d'huile

Publications (1)

Publication Number Publication Date
EP2930726A1 true EP2930726A1 (fr) 2015-10-14

Family

ID=50440558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14163853.6A Withdrawn EP2930726A1 (fr) 2014-04-08 2014-04-08 Installation de déshydratation d'huile

Country Status (1)

Country Link
EP (1) EP2930726A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111261385A (zh) * 2020-04-21 2020-06-09 温州市塔星电子科技有限公司 一种变压器用防护储油柜

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948111A1 (de) * 1979-11-29 1981-06-04 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg Mit oelfilteranlage versehener stufentransformatoren
US5691706A (en) * 1995-03-08 1997-11-25 Filmax, Inc. Transformer leak alarm
US6052060A (en) * 1998-03-09 2000-04-18 Filmax, Inc. Temperature monitor for electrical switchgear
WO2003077267A1 (fr) * 2002-03-08 2003-09-18 Maschinenfabrik Reinhausen Gmbh Installation de filtration d'huile
CN202860271U (zh) * 2012-11-15 2013-04-10 北京鑫佰利科技发展有限公司 一种高效滤油机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948111A1 (de) * 1979-11-29 1981-06-04 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg Mit oelfilteranlage versehener stufentransformatoren
US5691706A (en) * 1995-03-08 1997-11-25 Filmax, Inc. Transformer leak alarm
US6052060A (en) * 1998-03-09 2000-04-18 Filmax, Inc. Temperature monitor for electrical switchgear
WO2003077267A1 (fr) * 2002-03-08 2003-09-18 Maschinenfabrik Reinhausen Gmbh Installation de filtration d'huile
CN202860271U (zh) * 2012-11-15 2013-04-10 北京鑫佰利科技发展有限公司 一种高效滤油机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111261385A (zh) * 2020-04-21 2020-06-09 温州市塔星电子科技有限公司 一种变压器用防护储油柜

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