EP0795183B1 - Verfahren und vorrichtung zur verhütung von explosion und brand für elektrische transformatoren - Google Patents

Verfahren und vorrichtung zur verhütung von explosion und brand für elektrische transformatoren Download PDF

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Publication number
EP0795183B1
EP0795183B1 EP96932665A EP96932665A EP0795183B1 EP 0795183 B1 EP0795183 B1 EP 0795183B1 EP 96932665 A EP96932665 A EP 96932665A EP 96932665 A EP96932665 A EP 96932665A EP 0795183 B1 EP0795183 B1 EP 0795183B1
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Prior art keywords
coolant
transformer
enclosure
valve
pressure
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Expired - Lifetime
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EP96932665A
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English (en)
French (fr)
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EP0795183A1 (de
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Philippe Magnier
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    • 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
    • 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
    • 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
    • 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
    • H01F2027/406—Temperature sensor or protection

Definitions

  • the present invention relates to the field of prevention against explosion and fire of electrical transformers cooled by a combustible fluid.
  • Electric transformers suffer losses both in the windings only in the iron part, which require dissipation of the heat produced. So the high power transformers are generally oil-cooled. The oils used are dielectric and are liable to catch fire beyond temperature of the order of 140 °. The transformers being elements very expensive, their protection requires special attention.
  • Explosions can be caused by overloads, overvoltages, progressive deterioration of the insulation, a level insufficient oil, the appearance of water or mold or a breakdown an insulating component.
  • WO-A-94 28 566 relates to a device for monitoring a partial discharge in equipment high voltage electrical such as a transformer.
  • the device includes a transducer capable convert ultrasonic pressure waves following an insulation fault. We then evacuate the resulting electrical energy to the earth.
  • document EP-A-238,475 describes a fire extinguisher device of an electric oil transformer by injection of nitrogen under pressure at the bottom of the tank to stir the oil and cool the hottest parts of the oil.
  • Document DE-A-2 624 882 describes a device for overpressure protection in the transformer tank containing a coolant.
  • This device includes a safety valve in the form of a cover fitted an electrical contact.
  • the object of the present invention is therefore to provide a process which protects both against overpressure inside the transformer, due to deflagration when the insulation breaks internal electrical and against fire resulting from such ruptures insulation.
  • the invention also relates to a device for explosion and fire prevention which allows detection instant of the break in the electrical insulation.
  • the fire protection process of an electrical transformer comprising a tank filled with combustible coolant in which cools hot parts of the coolant by injection of an inert gas under pressure into the bottom of the tank in order to stir the coolant and expel the oxygen located nearby, includes, before the cooling step, a transformer explosion and fire prevention step by detection of a break in the electrical insulation of the transformer by a safety valve fitted with an electrical contact and forming a sensor means instant pressure and decompression of the transformer tank by draining partial cooling fluid by means of a valve.
  • the fire protection device of an electric transformer includes a tank filled with combustible coolant, and a safety valve fitted with an electrical contact and forming a sensor means pressure in said tank said valve being part of means of prevention against the explosion and the fire which also include a valve (15) instant decompression of the transformer tank by partial emptying of the coolant contained in the tank.
  • An insulation fault first generates a significant electric arc which causes an action of the electrical protection which triggers the supply cell of the transformer (circuit breaker).
  • the electric arc also causes a consequent diffusion of energy which generates an increase of enough internal transformer pressure to tear the tank.
  • the device is equipped with a means for detecting the triggering of the transformer supply cell and control box which receives the signals emitted by the sensor means of the transformer and which is capable of transmitting control signals.
  • the device includes means for cooling the parts hot fluid, by injecting inert gas into the bottom of the tank, controlled by a control signal from the control unit.
  • inert gas into the bottom of the tank
  • a control signal from the control unit controls a heating capable of igniting it.
  • Injection of an inert gas into the bottom of the tank causes a cooling fluid circulation which homogenizes the temperature and makes it possible to expel the oxygen present at proximity to the fluid.
  • the transformer 1 comprises a tank 2 resting on the ground 3 by means of feet 4 and is supplied with electrical energy by wires 5 surrounded by insulators 6.
  • the tank 2 is filled with cooling fluid 7, by example, dielectric oil.
  • cooling fluid 7 by example, dielectric oil.
  • the transformer 1 is provided with an auxiliary tank 8 in communication with the tank 2 by a pipe 9.
  • Line 9 is provided with an automatic valve 10 which closes line 9 as soon as it detects rapid movement of the fluid 7.
  • an automatic valve 10 which closes line 9 as soon as it detects rapid movement of the fluid 7.
  • the tank 2 is provided with a pressure sensor 11 capable of detect without delay the pressure variation due to the deflagration caused by the breaking of the electrical insulation of the transformer 1.
  • the pressure sensor 11 consists of a safety valve fitted with an electrical contact and thus capable of transmit information relating to pressure variation detected.
  • the tank 2 is also provided with temperature sensors 12 located in several points of the tank 2, in order to know the fluid temperature 7. However, these temperature sensors 12 have an estimated delay of 20 or 30 seconds from the pressure detector 11, due to the slower propagation of the heat than pressure.
  • the tank 2 comprises a sensor 13 for the presence of steam coolant also called buchholz mounted in a high point of tank 2, generally on line 9. Deflagration due to a break in electrical isolation quickly causes the release of vapor from the fluid 7 in the tank 2. A sensor for steam 13 is therefore effective in detecting a break in the insulation electric.
  • the transformer 1 is supplied via a supply cell, not shown, which comprises means for power cut such as circuit breakers and which is provided with trigger sensors 21.
  • the tank 2 is provided with draining means comprising a pipe 14 to which it is connected at the desired height of the level emptying. Line 14 is closed by a strong valve 15 diameter for example 100 to 150 mm.
  • the tank 2 includes a means of cooling of the fluid 7 by injection of an inert gas 16 such as nitrogen at the bottom of the tank 2.
  • the inert gas 16 is stored in a pressure tank 17 provided with a valve 18, a pressure reducer 19 and a pipe 20 bringing the gas 16 to the tank 2.
  • the pressure sensor 11, the temperature sensors 12, the steam sensor 13, trigger sensors 21, valve 15 of the pipe 14 and the valve 18 of the pipe 20 are connected to a housing of command 22 intended to control the operation of the device.
  • the control box 22 is provided with processing means receiving signals from different sensors and capable send control signals to valves 15 and 18.
  • the device is actuated by a high pressure signal in origin of the pressure sensor 11 coincident with a signal of trigger from the trigger sensors 21 of the transformer 1 supply cell to prevent explosion and the fire.
  • the device can also be activated by a signal high temperature from one of the temperature sensors 12 coinciding with a steam signal from the steam sensor 13 to start the extinction of a fire. So, two sensors are required to provide consistent information in order to avoid nuisance trips.
  • the device Under normal conditions, the device is triggered by the high pressure information, in accordance with the information of triggering of the supply cell, which controls instantly step 23 of opening the drain valve 15 which allows instant decompression of tank 2 of transformer 1 most of the components of which will therefore remain intact, except elements located in an area very close to the electric arc caused by the insulation fault.
  • the opening of the valve 15 allows avoid overflowing of inflamed fluid 2 when injecting inert gas 16 in the tank 2 which is liable to be damaged.
  • the opening of the valve 15 causes a decompression in the pipe 9 which leads to the closing of the automatic valve 10.
  • the make-up tank 8 is thus isolated and the fluid 7 which it contains does not fuel the fire.
  • the rapid opening of valve 15 decreases also the risk of explosion and increases the likelihood that the tank 2 of transformer 1 remains intact.
  • step 24 of injecting inert gas 16 at the bottom of the tank 2 is systematically triggered after a given time delay, for example 20 seconds, to brew the fluid 7 in order to homogenize its temperature and also for smother any flames on the surface of the fluid 7 while driving oxygen.
  • the fluid 7 generally oil, cannot ignite only at a temperature above the flash point, i.e. about 140 °.
  • the surface of the fluid 7 reaches this value while the average temperature is at most 80 °.
  • the mixing of the fluid 7 therefore allows a drop in the temperature of the hottest parts.
  • the tank 17 inert gas 16 is provided to be able to inject inert gas 16 for a period of the order of 45 minutes much greater than the expected time to extinguish the fire.
  • the transformer 1 can be equipped with one or more on-load changers 25 serving as interfaces between said transformer 1 and the electrical network to which it is connected to ensure a constant voltage despite variations in the current supplied to the network.
  • the on-load changer 25 is connected by a pipe 26 to line 14 intended for emptying. Indeed, the tap changer under load 25 is also cooled by a coolant flammable. Due to its reduced volume, the explosion of a tap changer is extremely violent and can accompanied by spraying of coolant jets inflamed.
  • Line 26 is provided with a calibrated diaphragm 27 able to tear in the event of a short circuit and therefore overpressure at inside the on-load tap-changer 25. This avoids the explosion of the tank of said on-load tap-changer 25.
  • This one also includes a pressure sensor 28 connected, on the one hand, to the transformer 1 supply cell to trigger it and, on the other hand, to the control unit 22 to trigger the operation of the prevention device during a short circuit in the on-load changer 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformer Cooling (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Testing Relating To Insulation (AREA)

Claims (13)

  1. Verfahren zur Verhütung von Explosion und Brand eines elektrischen Transformators (1), der ein mit brennbarem flüssigem Kühlmittel (7) gefülltes Gefäß (2) aufweist, in dem heiße Teile des flüssigen Kühlmittels (7) durch Injektion eines Inertgases (16) unter Druck in den unteren Teil des Gefäßes (2) gekühlt werden (24), um das flüssige Kühlmittel (7) durchzurühren und den in der Nähe befindlichen Sauerstoff auszutreiben, dadurch gekennzeichnet, daß dem Schritt der Kühlung ein Schritt zur Verhütung von Explosion und Brand, ein Schritt der Feststellung eines Bruchs der elektrischen Isolierung des Transformators (1) durch ein Sicherheitsventil vorhergeht, das mit einem elektrischen Kontakt versehen ist und ein Drucksensormittel (11) und zur sofortigen Dekompression des Gefäßes des Transformators durch Teilentleerung (23) des flüssigen Kühlmittels (7) mittels eines Ventils (15) bildet.
  2. Verfahren nach Anspruch 1, gekennzeichnet durch einen Schritt der Isolierung eines Zusatzbehälters (8) für flüssiges Kühlmittel (7) mittels einer Klappe (10), um zu verhindern, daß sich das flüssige Kühlmittel (7) ausbreitet, wobei sich die Klappe (10) schließt, sobald eine rasche Bewegung des flüssigen Kühlmittels (7) festgestellt wird.
  3. Verfahren nach einem beliebigen der vorhergehenden Ansprüche, gekennzeichnet durch einen Schritt der Festellung des Vorhandenseins von Dampf des flüssigen Kühlmittels (7) im Gefäß (2) des Transformators (1) mittels eines Dampfsensors (13), der in der Lage ist, die Teilentleerung des flüssigen Kühlmittels (7) und die Injektion von Inertgas (16) herbeizuführen.
  4. Verfahren nach einem beliebigen der vorhergehenden Ansprüche, gekennzeichnet durch einen Schritt der Feststellung der Temperatur des flüssigen Kühlmittels (7) mittels Temperatursensoren (12), die in der Lage sind, die Teilentleerung des flüssigen Kühlmittels (7) und die Injektion von Inertgas (16) herbeizuführen.
  5. Verfahren nach einem beliebigen der vorhergehenden Ansprüche, gekennzeichnet durch einen Schritt der Feststellung der Auslösung einer Versorgungszelle des Transformators mittels Auslösesensoren (21), die in der Lage ist, die Teilentleerung des brennbaren flüssigen Kühlmittels (7) und die Injektion von Inertgas (16) herbeizuführen.
  6. Verfahren nach einem beliebigen der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß der Schritt der Teilentleerung (23) der Flüssigkeit (7) nur ausgelöst wird, wenn zwei Sensoren gleichzeitig die Auslösung des Schritts (23) befehlen.
  7. Vorrichtung zur Verhütung von Explosion und Brand eines elektrischen Transformators (1), der ein mit brennbarem flüssigem Kühlmittel (7) gefülltes Gefäß (2) aufweist, wobei die Vorrichtung ein Sicherheitsventil umfaßt, das mit einem elektrischen Kontakt versehen ist und ein Drucksensormittel in dem Gefäß (2) bildet, dadurch gekennzeichnet, daß das Ventil Teil der Mittel zur Verhütung von Explosion und Brand ist, die außerdem ein Ventil (15) zur sofortigen Dekompression des Gefäßes des Transformators durch Teilentleerung des im Gefäß (2) enthaltenen flüssigen Kühlmittels (7) enthalten.
  8. Vorrichtung nach Anspruch (7), dadurch gekennzeichnet, daß die Mittel zur Verhütung von Explosion und Brand außerdem ein Dampfsensormittel (13) für das flüssige Kühlmittel (7) im Gefäß (2), Sensormittel für die Temperatur (12) des flüssigen Kühlmittels (7) im Gefäß (2) und ein Auslösesensormittel (21) für eine Versorgungszelle des Transformators (1) umfassen.
  9. Vorrichtung nach einem beliebigen der Ansprüche 7 oder 8, gekennzeichnet durch ein Steuergehäuse (22), das die von den Sensormitteln des Transformators (1) ausgesendeten Signale empfängt und in der Lage ist, Befehlssignale auszusenden.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß das Ventil (15) zur Dekompression mit durch ein Befehlssignal des Steuergehäuses (22) ausgelöster Öffnung ist.
  11. Vorrichtung nach einem beliebigen der Ansprüche 9 oder 10, gekennzeichnet durch ein Mittel zur Kühlung der heißen Teile des flüssigen Kühlmittels (7) durch Injektion von Inertgas (16) in den unteren Teil des Gefäßes (2).
  12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß das Injektionsmittel für Inertgas (16) einen Druckgasbehälter (17), ein Reduzierventil (19) und ein Ventil (18) mit durch einen Befehlssignal des Steuergehäuses (22) befohlener Öffnung umfaßt.
  13. Vorrichtung nach einem beliebigen der Ansprüche 7 bis 12, dadurch gekennzeichnet, daß sie ein Sensormittel (28) für den Druck in einem Wechsler für den Ladungsabgriff (25) des Transformators und ein Mittel zum Setzen des Wechslers für den Ladungsabgriff auf Atmosphärendruck umfaßt, das dazu bestimmt ist, seine Explosion zu verhindern.
EP96932665A 1995-09-28 1996-09-27 Verfahren und vorrichtung zur verhütung von explosion und brand für elektrische transformatoren Expired - Lifetime EP0795183B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE69608784T DE69608784T9 (de) 1995-09-28 1996-09-27 Verfahren und vorrichtung zur verhütung von explosion und brand für elektrische transformatoren

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9511386 1995-09-28
FR9511386A FR2739486B1 (fr) 1995-09-28 1995-09-28 Procede et dispositif de protection contre l'explosion et l'incendie des transformateurs electriques
PCT/FR1996/001513 WO1997012379A1 (fr) 1995-09-28 1996-09-27 Procede et dispositif de prevention contre l'explosion et l'incendie des transformateurs electriques

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EP0795183A1 EP0795183A1 (de) 1997-09-17
EP0795183B1 true EP0795183B1 (de) 2000-06-07

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US (1) US5946171A (de)
EP (1) EP0795183B1 (de)
JP (1) JPH10510105A (de)
KR (1) KR100441193B1 (de)
CN (1) CN1079573C (de)
AT (1) ATE193784T1 (de)
BG (1) BG63740B1 (de)
CA (1) CA2206793C (de)
CZ (1) CZ293859B6 (de)
DE (2) DE69608784T9 (de)
DK (1) DK0795183T3 (de)
ES (1) ES2148795T3 (de)
FR (1) FR2739486B1 (de)
GR (1) GR3034274T3 (de)
HK (1) HK1003400A1 (de)
HU (1) HU221222B1 (de)
MX (1) MX9703595A (de)
PT (1) PT795183E (de)
RO (1) RO116688B1 (de)
RU (1) RU2215352C2 (de)
SK (1) SK284150B6 (de)
UA (1) UA45365C2 (de)
WO (1) WO1997012379A1 (de)

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FR2739486B1 (fr) * 1995-09-28 1997-11-14 Magnier Philippe Procede et dispositif de protection contre l'explosion et l'incendie des transformateurs electriques
FR2783348B1 (fr) * 1998-09-15 2000-10-13 Alstom Technology Methode de discrimination entre un arc interne et un arc de coupure dans un disjoncteur de moyenne ou de haute tension
FR2791463B1 (fr) 1999-03-22 2001-06-29 Philippe Magnier Dispositif de prevention contre l'explosion des transformateurs electriques
US6429662B1 (en) * 2000-06-14 2002-08-06 Ifd Corporation Internal fault indicator for power electrical devices
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AU2002311624A1 (en) * 2002-03-01 2003-09-16 Anil Kohli On-line detection and measurement system for gases in oil-filled electrical equipment
US7842122B2 (en) * 2003-10-31 2010-11-30 Waukesha Electric Systems Incorporated Gas remover apparatus and method
FR2888034B1 (fr) * 2005-06-29 2010-10-08 Philippe Magnier Dispositif de prevention contre l'explosion d'un transformateur electrique
ES2375152T3 (es) 2005-11-16 2012-02-27 Ctr Manufacturing Industries Limited Procedimiento y dispositivo para la prevención y protección de un transformador eléctrico frente a una explosión e incendio.
EA013345B1 (ru) * 2006-10-27 2010-04-30 ФИЛИПП МАНЬЕ ЭлЭлСи Устройство для предотвращения взрыва электрического трансформатора
DE102007029905B4 (de) * 2007-06-28 2009-07-02 Areva Energietechnik Gmbh Verfahren zum Betreiben eines elektrischen Transformators
SI2232510T1 (sl) * 2008-01-01 2012-11-30 Ctr Mfg Ind Ltd Sistem in postopek za preprečitev zaščito oltc pred ognjem in ali transformatorja pred eksplozijo
DE102008027274B3 (de) * 2008-06-06 2009-08-27 Maschinenfabrik Reinhausen Gmbh Leistungstransformator mit Stufenschalter
US8400320B2 (en) * 2009-12-30 2013-03-19 Eduardo Pedrosa Santos System for monitoring oil level and detecting leaks in power transformers, reactors, current and potential transformers, high voltage bushings and the like
KR101561357B1 (ko) 2010-06-07 2015-10-16 아이에프디 인터널 폴트 디텍터 코포레이션 전기 장비용 내부 결함표시기
FR2971357B1 (fr) 2011-02-08 2013-02-15 Philippe Magnier Llc Dispositif de prevention contre l'explosion d'un transformateur electrique muni d'un indicateur de liquide
FR2973153A1 (fr) 2011-03-21 2012-09-28 Philippe Magnier Llc Dispositif de prevention d'explosion d'un changeur de prise en charge muni d'un element de rupture
US8319590B2 (en) * 2011-03-21 2012-11-27 Philippe Magnier Llc Device for explosion prevention of an on load tap changer including a rupture element
KR101749902B1 (ko) * 2011-06-23 2017-06-22 현대일렉트릭앤에너지시스템(주) 중전압 가스 절연 스위치기어
MX354237B (es) * 2011-10-11 2018-02-19 Sentry Depressurization Systems Inc Sistema de despresurizacion para un transformador electrico.
IN2014DN07676A (de) * 2012-02-20 2015-05-15 Franklin Fueling Systems Inc
KR101310691B1 (ko) * 2013-07-04 2013-09-24 (주)동성기술감리단 변전소의 변전용 특고압 변압기
US10193328B2 (en) * 2014-01-07 2019-01-29 Easun-Mr Tap Changers (P) Ltd Method and system for protecting transformers from internal fire
EP2899728B2 (de) * 2014-01-22 2019-11-13 ABB Schweiz AG Vorrichtung mit einer Hochspannungsvorrichtung mit einer Flüssigkeit und Vorrichtung zur Bestimmung einer oder mehrerer physikalischer Eigenschaften der Flüssigkeit
KR101483056B1 (ko) * 2014-07-21 2015-01-16 Koc 전기 주식회사 변압기
CA2976285A1 (en) 2015-02-23 2016-09-01 Ifd Internal Fault Detector Corp. Integrated fault monitoring apparatus for electrical equipment
RU2634125C1 (ru) * 2016-12-09 2017-10-24 ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ КАЗЕННОЕ ВОЕННОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ ВЫСШЕГО ОБРАЗОВАНИЯ "Военная академия Ракетных войск стратегического назначения имени Петра Великого" МИНИСТЕРСТВА ОБОРОНЫ РОССИЙСКОЙ ФЕДЕРАЦИИ Устройство диагностики силового масляного трансформатора
CN107342156A (zh) * 2017-07-04 2017-11-10 广东电网有限责任公司惠州供电局 一种新型主变压器本体呼吸器装置
CN108281249B (zh) * 2018-03-23 2024-01-30 中国能源建设集团云南省电力设计院有限公司 一种侧面套管变压器挡油装置
UA123375C2 (uk) * 2019-05-29 2021-03-24 Леонід Нісонович Конторович Система попередження вибуху і пожежі високовольтного електричного устаткування
EP3876247A1 (de) * 2020-03-04 2021-09-08 General Electric Technology GmbH Dichtungsvorrichtung für eine flüssigkeitsgefüllte elektrische ausrüstung und zugehörige anordnung
KR102114657B1 (ko) * 2020-03-25 2020-05-25 (주)성문기술단 변전소의 특고압 제어시스템
CN112233890A (zh) * 2020-09-04 2021-01-15 国网福建省电力有限公司泉州供电公司 一种变压器油枕油位监控方法及装置
KR102586024B1 (ko) 2023-03-17 2023-10-06 주식회사 중앙씨아이씨 인공지능 기반 변압기와 전신주 케이블 연결감시 시스템

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DE2624882A1 (de) * 1976-06-03 1977-12-15 Transformatoren Union Ag Ueberdruckschutzeinrichtung fuer mit isolierfluessigkeit oder isoliergas gefuellte elektrische maschinen und apparate
AT386527B (de) * 1986-02-20 1988-09-12 Elin Union Ag Einrichtung zum loeschen eines brandes
FR2684248B1 (fr) * 1991-11-22 1997-04-30 Pioch Sa Appareil electronique de mesure et de protection du fonctionnement du transformateur a huile.
JP2766574B2 (ja) * 1992-01-07 1998-06-18 三菱電機株式会社 油入電器の異常監視装置
WO1994028566A1 (en) * 1993-05-20 1994-12-08 University Of Technology, Sydney Partial discharge passive monitor
FR2739486B1 (fr) * 1995-09-28 1997-11-14 Magnier Philippe Procede et dispositif de protection contre l'explosion et l'incendie des transformateurs electriques

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CN100593220C (zh) * 2006-11-15 2010-03-03 上海置信电气非晶有限公司 非晶合金单相油浸组合式变压器

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KR970707563A (ko) 1997-12-01
GR3034274T3 (en) 2000-12-29
DE69608784T2 (de) 2001-02-01
HUP9800461A2 (hu) 1998-06-29
DE795183T1 (de) 1998-01-15
CA2206793A1 (fr) 1997-04-03
HK1003400A1 (en) 1998-10-30
HU221222B1 (hu) 2002-08-28
CZ293859B6 (cs) 2004-08-18
CN1079573C (zh) 2002-02-20
FR2739486B1 (fr) 1997-11-14
PT795183E (pt) 2000-11-30
CN1165581A (zh) 1997-11-19
FR2739486A1 (fr) 1997-04-04
EP0795183A1 (de) 1997-09-17
BG63740B1 (bg) 2002-10-31
DE69608784D1 (de) 2000-07-13
ES2148795T3 (es) 2000-10-16
UA45365C2 (uk) 2002-04-15
DE69608784T9 (de) 2012-03-29
US5946171A (en) 1999-08-31
RU2215352C2 (ru) 2003-10-27
SK64597A3 (en) 1997-10-08
KR100441193B1 (ko) 2004-11-03
SK284150B6 (sk) 2004-10-05
MX9703595A (es) 1997-08-30
WO1997012379A1 (fr) 1997-04-03
DK0795183T3 (da) 2000-10-02
ATE193784T1 (de) 2000-06-15
RO116688B1 (ro) 2001-04-30
CA2206793C (fr) 2011-09-20
JPH10510105A (ja) 1998-09-29
CZ153297A3 (cs) 1998-12-16
HUP9800461A3 (en) 2000-03-28
BG101451A (en) 1997-11-28

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