EP0232471B1 - Hochspannungsstromwandler und Verfahren zur Herstellung eines derartigen Hochspannungsstromwandlers - Google Patents

Hochspannungsstromwandler und Verfahren zur Herstellung eines derartigen Hochspannungsstromwandlers Download PDF

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Publication number
EP0232471B1
EP0232471B1 EP86115071A EP86115071A EP0232471B1 EP 0232471 B1 EP0232471 B1 EP 0232471B1 EP 86115071 A EP86115071 A EP 86115071A EP 86115071 A EP86115071 A EP 86115071A EP 0232471 B1 EP0232471 B1 EP 0232471B1
Authority
EP
European Patent Office
Prior art keywords
current transformer
voltage current
terminal plate
conductor
arm
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.)
Expired - Lifetime
Application number
EP86115071A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0232471A2 (de
EP0232471A3 (en
Inventor
Norbert Dipl.-Ing. Preissinger (Fh)
Teofil Dipl.-Ing. Bogdan
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.)
Trench Germany GmbH
Original Assignee
MWB Messwandler Bau 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
Priority claimed from DE19853540547 external-priority patent/DE3540547A1/de
Application filed by MWB Messwandler Bau AG filed Critical MWB Messwandler Bau AG
Priority to AT86115071T priority Critical patent/ATE70141T1/de
Publication of EP0232471A2 publication Critical patent/EP0232471A2/de
Publication of EP0232471A3 publication Critical patent/EP0232471A3/de
Application granted granted Critical
Publication of EP0232471B1 publication Critical patent/EP0232471B1/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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core

Definitions

  • the present invention relates to a high-voltage current transformer according to the preamble of claim 1 and to a method for producing such a high-voltage current transformer according to claim 31.
  • a high-voltage current transformer of this type is known from DE-A-16 13 798.
  • an end plate is provided on a column made of insulating material (support), to which a cylindrical head cover that can be assembled from two flange parts is attached laterally.
  • the hood-shaped upper part of the hood is provided with two lateral openings through which the rod-shaped primary conductor is passed, as usual, electrical contact being made between the primary conductor and the hood at one opening, while the passage of the primary conductor is insulated at the other opening he follows.
  • the rod-shaped primary conductor passes through the ring core or rings of the secondary system in the horizontal direction.
  • the ring cores of the secondary system are enclosed in a metallic, grounded core capsule.
  • the core capsule is attached to the end plate of the insulating column together with the ring cores via a conical insulator and is thus supported.
  • the hood is divided into two parts and is therefore of double-skin design.
  • a high-voltage current transformer in which a closing plate is provided on a column made of insulating material (support), on which a lying cylindrical head hood with a lower-lying side outlet opening is welded via a molded shaft.
  • the primary conductor is passed through the standing toroidal cores of the secondary system and inserted or removed at the front faces of the hood, each with an opening.
  • the ring cores of the secondary system are enclosed in a metallic, grounded core capsule.
  • the core capsule is supported either on the end faces of the hood and / or on the discharge pipe for the secondary discharges, which passes through the insulating column.
  • the hood is longitudinally divided for better assembly and is therefore double-shell.
  • Both known versions of a high-voltage head current transformer with a hood therefore have not only three openings, which must be tightly sealed during assembly for later filling with insulating liquid or pressurized insulating gas, but also the transverse or longitudinal separation planes of the head housing to be sealed.
  • a high-voltage overhead current transformer in which the start and end sections of the primary conductor are led out downwards from a molded insulating body.
  • the insulating body consists of a molded plastic part that completely surrounds the active parts of the converter.
  • the insulating body has a molded flange with which it is attached to an insulating column.
  • the active parts of the high-voltage overhead current transformer are surrounded by the molded insulating body, but not by a housing. Only the uppermost winding sector of the secondary winding and the expansion vessel arranged above it is covered with a pot-shaped expansion tank.
  • the primary conductor is rod-shaped and arranged horizontally so that it pierces the side walls of the housing with its two lateral ends. This requires additional seals there.
  • FR-A-2 003 875 a high-voltage overhead current transformer of the type described first in US-A-3,525,908 above is known, but which does not have an expansion vessel.
  • the object of the present invention is to design a high-voltage current transformer of the type mentioned at the outset in such a way that simple manufacture of the head housing and good sealing with the least possible sealable bushings or parting planes within the head housing or the end plate are made possible.
  • the primary conductor and the secondary system should be easy to mount on the end plate of the insulating column.
  • the invention also relates to a method for producing such a high-voltage current transformer, which is described by the characterizing features of claim 31.
  • a head-mounted high-voltage current transformer in particular under the usual excess pressure of an inert insulating gas, such as sulfur hexafluoride, which essentially consists of a column made of insulating material (supports), such as porcelain, epoxy resin or a composite insulator made of a GRP tube with cast-on silicone fins , consists of a foot part 3 carrying this and a head part 4 which contains the active system consisting of primary conductor and secondary system.
  • an outlet pipe 5 is arranged coaxially to the latter, in which the secondary outlets 6 run and are guided to the secondary terminals in the foot part 3.
  • a potential control device in particular a potential control winding, consisting of insulating foils and capacitor coatings, can be provided between the discharge pipe 5 and the column 2 in a manner known per se.
  • an end plate 8 is insulated, ie oil or gas-tight. It preferably has a collar 9 projecting downwards (see FIG. 2) which engages over the column 2 from the outside.
  • An inner support edge 10 lies on the end face 11 of the column 2 with the interposition of a seal 12.
  • the discharge pipe 5 is inserted in a secondary system 16, which preferably consists of a plurality of ring cores 13 with associated secondary windings (not shown) and a cast resin sheathing 15 forming a ring 14.
  • the latter is only attached to the end plate 8 via insulating supports 17 (see FIG. 3). These supports 17 are advantageously arranged at an angle to the outside and are expediently attached centrally to the discharge pipe 5.
  • the primary conductor 18 is exclusively attached to the end plate 8.
  • This is U-shaped or at least approximately U-shaped, the base 19 of which passes through the ring 14 or the core (s) 13 at least approximately centrally and fastens the two legs 20, 21 in this by means of connecting sections 22 which are guided through the end plate 8 in an insulating-tight manner are.
  • An outer flange 23 attached to the legs 20, 21 serves as a support.
  • the legs 20, 21 are from the outside, i.e. contactable from below the end plate 8.
  • the end plate 8 is designed such that it projects laterally on all sides of all active parts, that is to say the secondary system 16 and the entire primary conductor 18.
  • it has a tub or plate shape.
  • a hood 24 designed as a head housing is placed over these aforementioned parts from above.
  • the hood 24 can consist of a tube section 29 and a hood or pot-shaped cover 30, which are soldered or welded at the joint 31 in the case of a metal design, or overlapped at the joint 31 for example in the case of a GRP (glass fiber reinforced plastic) version.
  • the hood 24 can also consist of a single drawn, pressed or molded part.
  • the secondary discharges are led out on the circumference 32 at a reinforced diversion point 33, into which the diversion pipe 5 is inserted.
  • the ring 14 is preferably metallized on the outside, for example with spray galvanizing. As usual, this metal covering is connected to earth potential.
  • At least three supports 17 are provided.
  • the supports 17 for the ring 14 can also be integrally formed on the ring 14, that is to say they can be cast in one piece from casting resin. But they can also be molded with suitable approaches or releasably connected to the ring 14.
  • the projecting free ends 34 of the supports 17 rest on correspondingly adapted, in particular perpendicular to the longitudinal axis L of the supports 17 arranged support surfaces 35 of the end plate 8.
  • a bore 36 is provided within the support surface 35, through which a screw shaft 37 of a fastening screw 38 projects and is screwed to a molded-in threaded part designed as a threaded bushing 39.
  • a seal 40 is provided between the support 17 and the end plate 8. If necessary, in order to increase security against the outflow of compressed gas or insulating oil, a cover 42 can be applied over the screw head 41 or via a corresponding nut, which in turn is tightly connected, in particular screwed, to the end plate 8.
  • the arrangement of an individual support 17 on the ring 14 can also be carried out in such a way that a threaded part 43 designed as a threaded sleeve or threaded bolt is molded into the cast resin sheathing 15 and the supports 17 can be screwed to the latter by means of a counter-threaded part 44 molded therein.
  • connection between the diversion point 33 and the diversion pipe 5 is mechanical as a longitudinally displaceable plug connection, preferably plug contact connection.
  • the upper end of the diversion tube 5 is coaxially surrounded and held resiliently in the manner of a sliding fit by one or more contact springs 45, for example as ring contact springs arranged in the ring around the diversion tube 5, preferably as a multiply slotted collar (see FIG. 4).
  • the primary conductor 18 can consist of two or more parts, for example an angle and one leg or a base and two legs. At an angle, the one angle leg forms the base 19 to which the leg 20 or 21 is attached.
  • This type of design allows easy installation, especially with small core or ring inner diameters.
  • the legs 20, 21 are attached at an obtuse angle to a right angle at the ends 46 (see FIG. 2) of the rod-shaped base 19.
  • the legs 20, 21 can be designed as bolts.
  • the insulation of the leg or legs 20 and / or 21 is advantageously carried out via an insulating bush 47 and a ring 48, which is preferably a flange of the insulating bush 47, which are tightly attached in the end plate 8, for example by pouring or by means of ring seals or the like .
  • the ring or flange 48 is tightly screwed on the one hand to the outer flange 23 of the legs 20, 21 and on the other hand to the end plate 8.
  • a further advantageous embodiment of the invention consists in that the primary conductor 18 is designed as a coaxial double conductor in which two U-shaped conductors which are insulated from one another are provided.
  • One preferably consists of an outer conductor 50 and the other of an inner conductor 51. These are separated from one another and fixed in position by suitable insulation paths, which are at least partially formed by a solid dielectric 52, such as cast resin.
  • the dielectric 52 is at least in the Area of the connecting sections 22 is provided and thus seals at the same time.
  • the outer conductor 50 of one leg 20 is arranged insulated from the end plate 8 by an insulating bush 47 (see FIG. 5) and the outer conductor 50 of the other leg 21 is conductively connected to the end plate 8, for example directly attached therein without insulation.
  • the outer conductors 50 of the legs 20, 21 have an outer flange 23.
  • the inner conductors 51 of the legs 20, 21 are guided to the outside in an insulated manner, and connection contacts 53, for example by means of a clamp 54, can be pivoted accordingly. The same can be provided on the insulated outer conductor 50 of the leg 20.
  • This configuration of the primary conductor 18 as a double conductor makes it possible to use the two conductors separately or to connect them in series or in parallel. It is therefore possible to switch over in a ratio of 1: 2, or with a parallel connection the primary conductor can be used for a higher current load.
  • each of the two coaxial conductors can also carry a separate measuring current.
  • the parallel connection takes place by interconnecting the inner conductor 50 and the outer conductor 51 of the leg 20 and the leg 21.
  • connection contacts 53 to the left outer conductor 50, by electrically connecting the outer flange 23 to the electrically conductive end plate 8, by a further electrical connection of the end plate 8 via a further connection contact 53 (shown in broken lines in FIG. 2) with the Left inner conductor 51, with further contact being made with the right connection contact 53 on the right connection section 22.
  • Clamp clamps 54 can also be used to connect the base 19 of the primary conductor 18 to the legs 20, 21. These can be made from the tubular or solid material of the legs 20, 21 or from the base 19, both for the outer conductors 50 and for the inner conductors 51. This can be done by appropriate shaping and / or machining. The diameter of the conductor part 55 to be clamped can be reduced (see FIG. 7).
  • the outer conductor 50 of the legs 20, 21 has a bore 57 in the region 56 of the inner conductor 51 of the base 19 (see FIG. 5).
  • connection of the outer conductors 50 from the base 19 to the legs 20, 21 takes place in each case via a flange 59 which is attached to the ends 19 of the outer conductor 50 on the base 19 and with which the ends 60 of the outer conductors 50 of the legs protrude somewhat inside the head housing 24 20, 21 are screwed.
  • the leg section of the primary conductor 18 projecting inward from the outer flange 23 of the legs 20, 21 into the head housing 24 can also be flattened and / or with respect to the longitudinal axis LS of the outer flange 23 or the connecting section 22 be offset to the outside, but have the same cross-section as the latter (see Fig. 10b).
  • the flat leg section of the legs 20, 21 can be adapted to the shape of the hood 24, that is to say it can be curved (see FIG. 11).
  • FIG. 12 shows a variant of the high-voltage overhead current transformer according to FIG. 2 for a non-switchable primary conductor 18. The same parts are provided with the same reference numerals as in FIGS. 1 and 2.
  • the primary conductor 18 is again U-shaped or at least approximately U-shaped, its base 19 passing through the ring 14 or the core or cores 13 together with secondary windings at least approximately centrally and the one leg 20 by means of a through the bore 100 the end plate 8 is connected to the insulation section 22 and is fastened therein.
  • An outer flange 23 attached to the leg 20 serves as a support.
  • This leg 20 can be contacted from the outside, ie from below the end plate 8.
  • the connection section 22 is secured by an insulating sleeve 47 and an insulating ring 48, which can consist of one piece with the insulating sleeve 47, insulated and insulated.
  • the other leg 21 is fastened from the inside by means of the outer flange 23 on the inside 101 of the end plate 8, in particular screwed on. There are no holes through to the outside, so that no seal is necessary.
  • the connection is made via an externally attached connection 106, so that the entire head is at the potential of the primary conductor 18 there. It is therefore a non-switchable primary conductor 18.
  • the end plate 8 is in turn designed such that it projects and surrounds all active parts, that is to say the secondary system 16 and the primary conductor 18, on all sides.
  • it has a tub or plate shape.
  • a hood 24 designed as a head housing is placed over these aforementioned parts.
  • a flange 27 is provided on the edge 26 delimiting the hood opening 25, with which the hood 24 can be screwed tightly onto the end plate 8 via screw connections 28.
  • the hood 24 can consist of a tube section 29 and a hood-shaped or pot-shaped cover 30, which are soldered, welded or screwed, for example flanged, at the butt joint 31 in the case of a metal version and overlap at the butt joint 31 for example in the case of a GRP (glass fiber reinforced plastic) version are.
  • the hood 24 can consist of a single drawn, pressed or molded part.
  • At least two, but preferably three supports 17 are provided.
  • the supporters 17 for the ring 14 can on Ring 14 itself with molded, so be cast in one piece from resin. But they can also be molded with suitable approaches or releasably connected to the ring 14.
  • the arrangement of an individual support 17 on the ring 14 can be such that a threaded part 43 designed as a threaded sleeve or threaded bolt is molded into the cast resin sheathing 15 and the supports 17 can be screwed to the latter by means of a counter-threaded part 44 molded therein.
  • connection between the diversion point 33 and the diversion pipe 5 is again mechanically designed as a longitudinally displaceable plug connection.
  • abutments 102 are formed or fastened, in particular screwed, on the inside 101.
  • the abutments 102 expediently have a support plate 103 for each support 17, the support surface 35 of which is preferably arranged perpendicular to the longitudinal axis L of the associated supports 17.
  • the support plates 103 are provided with a bore 104, through which a screw shaft 37 of a fastening screw 38 can be inserted from below and is screwed to a threaded part of the support 17 designed as a threaded bushing 39.
  • the support plates 103 can be one leg of an angle rail, the other leg of which is attached to the end plate 8, for example by screws from the inside.
  • a support plate 103 is advantageously provided on each side of a prism 105 and the prism 105 is molded onto the end plate 8 or fastened to it.
  • This type of support attachment within the space of the hood 24 avoids having to provide additional holes in the end plate 8 and thus have to be closed in an insulating-tight manner.
  • the high-voltage head current transformer according to the invention is installed in such a way that the ring 14 of the secondary system 16 is first attached to the end plate 8 by screwing the supports 17 there. Then the primary conductor 18 is pushed as a homogeneous component or as a pre-assembled unit through the ring 14, so that the base 19 of the primary conductor 18 passes through the ring 14 in parallel and the legs 20, 21 are tightly fastened in the end plate 8.
  • the legs 20, 21 can also first be fastened to the end plate 8 and then the base 19 of the primary conductor 18 can be connected to the inner ends 60 of the legs 20, 21. Then the hood 24 is put over and screwed tightly to the end plate 8.
  • This preassembled unit forming the head part 4 is placed on the column 2 (post insulator) and fastened in an insulating-tight manner at the flange point by means of the seals 12.
  • the attachment is carried out in a manner known per se, for example by screwing, pouring or the like.
  • the plug contact connection 5, 45 according to FIG. 4 is established.
  • the hood 24 can also be retrofitted. In any case, however, it must be ensured that the diversion tube 5 remains sufficiently displaceable relative to the ring 14 in order to avoid mechanical stresses and loads on the diversion tube 5 by the active system of the high-voltage current transformer according to the invention.
  • the primary conductor is designed as a U-shaped conductor with a horizontally running base 19 and with two legs 20, 21 running perpendicularly thereto.
  • the angle between the base 19 and the legs 20, 21 is more than 90 °, that is to say it can be designed as an obtuse angle of more than 90 °.
  • the primary conductor in particular in the switchable variant, preferably consists of several parts, preferably two or three parts, it is in principle also possible to form the primary conductor in one piece and to thread it through the window of the secondary system 16 by suitable twisting and with the end plate 8 to connect electrically and / or mechanically in a suitable manner. It is also fundamentally possible to place two such one-piece primary conductors one behind the other, namely insulated from one another, on the end plate 8 and to provide the necessary switchover by means of suitable connecting lugs.
  • the head housing or the hood 24 can be produced in a material-saving manner and with little work, that only a flange connection with the end plate 8 is provided, that the head housing 24 and the discharge pipe 5 for the secondary discharges with regard to the weight of the active system 13, 14, 18 of the high-voltage overhead current transformer are completely weight-relieved that, in addition to the insulating medium used, such as gas or oil, no further, in particular no mixed solid / gas or solid / oil dielectrics are required, and that in particular, a compact, slim and weight-saving design of the head housing 24 is possible, as a result of which the top-heavyness of such high-voltage current transformers is significantly reduced in comparison with known arrangements.
  • the insulating medium used such as gas or oil

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP86115071A 1985-11-15 1986-10-30 Hochspannungsstromwandler und Verfahren zur Herstellung eines derartigen Hochspannungsstromwandlers Expired - Lifetime EP0232471B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115071T ATE70141T1 (de) 1985-11-15 1986-10-30 Hochspannungsstromwandler und verfahren zur herstellung eines derartigen hochspannungsstromwandlers.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3540547 1985-11-15
DE19853540547 DE3540547A1 (de) 1985-11-15 1985-11-15 Hochspannungsstromwandler und verfahren zur herstellung eines derartigen hochspannungsstromwandlers
DE19863608391 DE3608391A1 (de) 1985-11-15 1986-03-13 Hochspannungsstromwandler
DE3608391 1986-03-13

Publications (3)

Publication Number Publication Date
EP0232471A2 EP0232471A2 (de) 1987-08-19
EP0232471A3 EP0232471A3 (en) 1987-12-16
EP0232471B1 true EP0232471B1 (de) 1991-12-04

Family

ID=25837901

Family Applications (1)

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EP86115071A Expired - Lifetime EP0232471B1 (de) 1985-11-15 1986-10-30 Hochspannungsstromwandler und Verfahren zur Herstellung eines derartigen Hochspannungsstromwandlers

Country Status (13)

Country Link
US (2) US4701738A (zh)
EP (1) EP0232471B1 (zh)
CN (1) CN1012331B (zh)
AT (1) ATE70141T1 (zh)
AU (1) AU591398B2 (zh)
BR (1) BR8605518A (zh)
CA (1) CA1264359A (zh)
DE (2) DE3608391A1 (zh)
HU (1) HUT44673A (zh)
IN (1) IN169082B (zh)
SU (1) SU1538906A3 (zh)
TR (1) TR22701A (zh)
YU (1) YU192486A (zh)

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US6760206B2 (en) 2001-03-16 2004-07-06 Cooper Industries, Inc. Current sensor supporting structure
DE102004046134A1 (de) * 2004-08-06 2006-03-16 Südkabel GmbH Freiluftendverschluss
DE102007020539A1 (de) * 2007-04-26 2008-10-30 Siemens Ag Messwandleranordnung
ITBO20080084U1 (it) * 2008-11-18 2010-05-19 Lorenzo Peretto Sistema costruttivo per sensore di corrente e/o di tensione elettrica
PL2800113T3 (pl) * 2013-04-29 2016-09-30 Suchy przekładnik WN
EP2955729A1 (de) * 2014-06-13 2015-12-16 Siemens Aktiengesellschaft Stützvorrichtung eines Aktivteils eines Stromwandlers
DE102015210135A1 (de) * 2015-06-02 2016-12-08 Siemens Aktiengesellschaft Stromwandler und Schaltanlage mit einem Stromwandler
RU196566U1 (ru) * 2019-11-05 2020-03-05 Общество с ограниченной ответственностью "Астер Электро" Изоляционный колпак вакуумного выключателя
US20230298811A1 (en) * 2020-08-13 2023-09-21 Siemens Energy Global GmbH & Co. KG Current transformer
EP4060696A1 (en) * 2021-03-17 2022-09-21 Hitachi Energy Switzerland AG High-voltage column current transformer

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Also Published As

Publication number Publication date
IN169082B (zh) 1991-08-31
EP0232471A2 (de) 1987-08-19
ATE70141T1 (de) 1991-12-15
TR22701A (tr) 1988-04-08
US4744138A (en) 1988-05-17
DE3608391C2 (zh) 1989-12-28
YU192486A (en) 1988-04-30
CN1012331B (zh) 1991-04-10
BR8605518A (pt) 1987-08-11
CN86107816A (zh) 1987-06-17
AU6513686A (en) 1987-05-21
DE3608391A1 (de) 1987-09-17
SU1538906A3 (ru) 1990-01-23
HUT44673A (en) 1988-03-28
EP0232471A3 (en) 1987-12-16
CA1264359A (en) 1990-01-09
US4701738A (en) 1987-10-20
AU591398B2 (en) 1989-11-30
DE3682761D1 (de) 1992-01-16

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