EP0536019A1 - Nichtexplosiver eingetauchter Hoch-/Niederspannungstransformator unter dauernden Überlast-Zustand - Google Patents

Nichtexplosiver eingetauchter Hoch-/Niederspannungstransformator unter dauernden Überlast-Zustand Download PDF

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Publication number
EP0536019A1
EP0536019A1 EP92402586A EP92402586A EP0536019A1 EP 0536019 A1 EP0536019 A1 EP 0536019A1 EP 92402586 A EP92402586 A EP 92402586A EP 92402586 A EP92402586 A EP 92402586A EP 0536019 A1 EP0536019 A1 EP 0536019A1
Authority
EP
European Patent Office
Prior art keywords
transformer
windings
tank
transformer according
voltage
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.)
Granted
Application number
EP92402586A
Other languages
English (en)
French (fr)
Other versions
EP0536019B1 (de
Inventor
Bruno Guilbert
Jean-Francis Faltermeier
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.)
Electricite de France SA
Societe Nouvelle Transfix Toulon SA
Original Assignee
Electricite de France SA
Societe Nouvelle Transfix Toulon SA
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 Electricite de France SA, Societe Nouvelle Transfix Toulon SA filed Critical Electricite de France SA
Publication of EP0536019A1 publication Critical patent/EP0536019A1/de
Application granted granted Critical
Publication of EP0536019B1 publication Critical patent/EP0536019B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a high voltage - low voltage submersible transformer for an electrical energy distribution network.
  • High / low voltage transformers currently in operation on the distribution network, conventionally include a metal tank containing the primary and secondary transformation windings. These electromagnetically coupled windings are electrically insulated, using paper insulator and are immersed in mineral oil, contained in the tank and acting as a dielectric insulator.
  • This type of insulation does not accept a high crest factor, the crest factor being defined as the ratio between the peak value of the load and the average load.
  • crest factor being defined as the ratio between the peak value of the load and the average load.
  • Another object of the present invention is the implementation of a high / low voltage submersible transformer allowing a large reduction in size compared to the transformers of the prior art, at equal power.
  • Another object of the present invention is finally the implementation of a high / low voltage submerged transformer in which the hot spot temperature is higher, which also allows a reduction in mass, at equal power.
  • the invention finds application in high / low voltage transformers of overhead electrical distribution networks, in particular in pole top transformers.
  • the transformer which is the subject of the invention comprises a metal tank denoted 1 containing the primary and secondary isolated transformation windings denoted 2 in FIG. 1. These windings are, conventionally, immersed in an insulating fluid.
  • the high-voltage terminals are designated by BHTA and the low-voltage terminals by BBT.
  • the insulation of the primary and secondary windings is carried out by a pair of synthetic insulating materials noted (10.20).
  • the primary and secondary windings can be isolated using aramid paper sold by the cios du Pont de Nemours under the trade name NOMEX, this aramid paper forming one of the materials 10 of the pair of insulating materials, this aramid paper can also be used as covering material for the winding conductors.
  • Electricity distributors must supply low-voltage customers with a low average annual load and a high peak load, in particular in rural areas where second homes are located, for example.
  • the high-voltage / low-voltage transformers used on the electrical distribution network use a pair of dielectric insulators such as cellulose paper / mineral oils, which due to its physicochemical properties does not make it possible to make the best use of them.
  • high voltage / low voltage transformers This type of insulation does not accept a high crest factor, the crest factor being defined as the ratio between the peak value of the load and the average load applied to the transformer.
  • crest factor being defined as the ratio between the peak value of the load and the average load applied to the transformer.
  • any increase of 6 K in the hot spot temperature of the transformer compared to the temperature resulting from the sizing recommended by the standards in force for a rated load corresponds in fact a reduction by a factor of 2 of the duration of life of this transformer.
  • the use of the couple of insulating materials in accordance with the object of the present invention overcomes the aforementioned drawback. Consequently, it is possible, thanks to this use, to obtain, on the one hand, a higher hot spot temperature, which makes it possible to reduce the size and the mass of the apparatus, and on the other hand a large increase in possibilities. overloading of transformers in accordance with the object of the present invention.
  • the use of the aforementioned pair of insulating materials makes it possible to obtain high operating temperatures, and above all, allows permanent overheating of large amplitudes.
  • the transformer of the prior art ages 25 times faster compared to its assigned operating speed, while under identical conditions, a transformer produced in accordance with the object of the present invention will age only eight times faster, an average value having been retained for the latter.
  • the tank 1 of the transformer is made of an aluminum alloy instead of conventional materials such as steel sheets.
  • these conventional materials do not allow a pressure of 1 bar to be exceeded inside the current tanks, and although the quantity of gas formed in the event of an electric arc inside the tank is reduced by a factor of 10 due to the use of the couple of insulating materials mentioned above, the pressures reached for a fault current of 1000 amperes, in the case of a fault lasting 0.5 seconds, are generally between 2 and 5 bars.
  • the tanks thus produced make it possible to withstand an internal tank pressure of at least 5 bars. This allows the device to withstand an internal fault, with a short-circuit current of up to 1000 A, of duration corresponding to the reaction time of the protections usually installed on high-voltage, MV, distribution networks, this without manifestation outside.
  • the tank itself is partially filled with electrically insulating dielectric fluid, the upper part of the free surface of the aforementioned fluid constituted by the silicone oil being filled with a neutral gas such as nitrogen for example.
  • FIG. 1a shows the free surface of the oil level denoted NH, the upper part above the aforementioned free surface being filled with the aforementioned gas.
  • the silicone oil used was an oil sold by the company RHONE-POULENC under the name Rhodorsil Oil 604 V 50, this oil belonging to the family of dimethylpolysiloxanes.
  • insulating materials 10 capable of being used for the implementation of the transformer which is the subject of the present invention, there may be mentioned, in addition to the aramid paper NOMEX previously mentioned, the aramid paper with mica, and the insulating material sold by the same company of Pont de Nemours International SA under the Kapton brand. These materials are high quality materials capable of working at temperatures between 200 to 220 ° for 20 years without significant change in their dielectric or insulating characteristics.
  • FIG 3a there is shown a front view, a side view and a top view of the transformer object of the present invention, in which the tank 1 was made of aluminum alloy as mentioned above.
  • the transformer object of the invention furthermore comprises, on each high-voltage supply, as shown in FIG. 3b in particular, a fuse marked 30, this fuse being placed inside the tank and submerged or not in the silicone oil.
  • fuses 30 may be constituted by fuses with current limitation, which make it possible to extinguish the electric arc of the fault.
  • expulsion fuses may be used. In these two cases, these fuses may have a breaking capacity greater than one hundred amperes.
  • the fuses 30 can be arranged in each of the high voltage supply terminals.
  • the transformer which is the subject of the present invention achieves a synergistic effect between the protection against bursting or explosion, due to the use of insulation between primary and secondary winding produced by a pair of insulating materials.
  • the transformer according to the invention comprises three high-voltage fuses located between the supply phases and the active part of the transformer, of simplified design because it should only protect the transformer for fault currents located above 1000 A, in addition to the measures mentioned above to form a combination of protections that economically cover all the short-circuit intensities encountered on a HTA distribution network.
  • the transformer according to the invention can be produced in such a way that the low-voltage windings are dimensioned for an adiabatic heating at given current lower than that of the high-voltage windings, this measure guaranteeing in the event of a maintained short-circuit downstream of the transformer, the appearance of an electrical fault on the high-voltage side, resulting in a large fault current as it is not limited by the leakage inductance between the MV winding and the LV winding, and therefore a fusion better and faster high-voltage fuses.
  • a non-explosive high / low voltage transformer has thus been described which is particularly advantageous insofar as it also allows operation in a permanent overload regime.
  • the transformer of the present invention makes it possible to take into account new requirements such as the reduction of voltage drops internal to the transformer, the connection of surge arresters or the connection under voltage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Insulating Materials (AREA)
  • Insulating Of Coils (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Transformer Cooling (AREA)
  • Discharge Heating (AREA)
  • Protection Of Transformers (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP92402586A 1991-09-23 1992-09-21 Nichtexplosiver eingetauchter Hoch-/Niederspannungstransformator unter dauernden Überlast-Zustand Expired - Lifetime EP0536019B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9111684A FR2681722B1 (fr) 1991-09-23 1991-09-23 Transformateur immerge non explosif haute/basse tension en regime de surcharge permanente.
FR9111684 1991-09-23

Publications (2)

Publication Number Publication Date
EP0536019A1 true EP0536019A1 (de) 1993-04-07
EP0536019B1 EP0536019B1 (de) 1997-07-09

Family

ID=9417182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402586A Expired - Lifetime EP0536019B1 (de) 1991-09-23 1992-09-21 Nichtexplosiver eingetauchter Hoch-/Niederspannungstransformator unter dauernden Überlast-Zustand

Country Status (7)

Country Link
EP (1) EP0536019B1 (de)
AT (1) ATE155279T1 (de)
DE (1) DE69220747T2 (de)
DK (1) DK0536019T3 (de)
ES (1) ES2106845T3 (de)
FR (1) FR2681722B1 (de)
GR (1) GR3024332T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7298055B2 (en) * 2005-07-15 2007-11-20 Abb Technology Ag Auxiliary power supply for a wind turbine
WO2008004107A2 (en) * 2006-07-03 2008-01-10 S.E.A. Societá Elettromeccanica Arzignanese S.P.A. Power reactor for energy transfer
CN104795222A (zh) * 2015-04-27 2015-07-22 常州特种变压器有限公司 高过载能力配电变压器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB388276A (en) * 1931-06-24 1933-02-23 British Thomson Houston Co Ltd Improvements in and relating to electric induction apparatus
FR2326016A1 (fr) * 1975-09-25 1977-04-22 Rte Corp Huile isolante pour appareils electriques
EP0364811A2 (de) * 1988-10-03 1990-04-25 E.I. Du Pont De Nemours And Company Verbundwickelkörper für elektrische Systeme
EP0375502A1 (de) * 1988-12-23 1990-06-27 Sagem Allumage Zündungsspule mit verteilter Hochspannungswicklung, insbesondere für eine innere Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016405A (ja) * 1984-06-25 1985-01-28 Matsushita Electric Works Ltd 安定器
JPH0218912A (ja) * 1988-07-07 1990-01-23 Toshiba Corp 箔巻変圧器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB388276A (en) * 1931-06-24 1933-02-23 British Thomson Houston Co Ltd Improvements in and relating to electric induction apparatus
FR2326016A1 (fr) * 1975-09-25 1977-04-22 Rte Corp Huile isolante pour appareils electriques
EP0364811A2 (de) * 1988-10-03 1990-04-25 E.I. Du Pont De Nemours And Company Verbundwickelkörper für elektrische Systeme
EP0375502A1 (de) * 1988-12-23 1990-06-27 Sagem Allumage Zündungsspule mit verteilter Hochspannungswicklung, insbesondere für eine innere Brennkraftmaschine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 161 (E-909)28 Mars 1990 & JP-A-2 018 912 ( TOSHIBA ) 23 Janvier 1990 *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 131 (E-319)6 Juin 1985 & JP-A-60 016 405 ( MATSUSHITA DENKO ) 28 Janvier 1985 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7298055B2 (en) * 2005-07-15 2007-11-20 Abb Technology Ag Auxiliary power supply for a wind turbine
WO2008004107A2 (en) * 2006-07-03 2008-01-10 S.E.A. Societá Elettromeccanica Arzignanese S.P.A. Power reactor for energy transfer
WO2008004107A3 (en) * 2006-07-03 2008-02-28 S E A Societa Elettromeccanica Power reactor for energy transfer
CN104795222A (zh) * 2015-04-27 2015-07-22 常州特种变压器有限公司 高过载能力配电变压器

Also Published As

Publication number Publication date
FR2681722A1 (fr) 1993-03-26
DK0536019T3 (da) 1997-12-29
DE69220747T2 (de) 1998-01-08
ES2106845T3 (es) 1997-11-16
EP0536019B1 (de) 1997-07-09
ATE155279T1 (de) 1997-07-15
GR3024332T3 (en) 1997-10-31
FR2681722B1 (fr) 1994-04-08
DE69220747D1 (de) 1997-08-14

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