EP2565884B1 - Hochspannungsspule - Google Patents

Hochspannungsspule Download PDF

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Publication number
EP2565884B1
EP2565884B1 EP12460050.3A EP12460050A EP2565884B1 EP 2565884 B1 EP2565884 B1 EP 2565884B1 EP 12460050 A EP12460050 A EP 12460050A EP 2565884 B1 EP2565884 B1 EP 2565884B1
Authority
EP
European Patent Office
Prior art keywords
coil
voltage
transformer
screen
screens
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.)
Active
Application number
EP12460050.3A
Other languages
English (en)
French (fr)
Other versions
EP2565884A2 (de
EP2565884A3 (de
Inventor
Zbigniew Wesolowski
Marcin Tarnowski
Pawel Debski
Pawel Grysztar
Jaroslaw Duzdowski
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
Priority claimed from PL120302U external-priority patent/PL66956Y1/pl
Priority claimed from PL397241A external-priority patent/PL221558B1/pl
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to PL12460050T priority Critical patent/PL2565884T3/pl
Publication of EP2565884A2 publication Critical patent/EP2565884A2/de
Publication of EP2565884A3 publication Critical patent/EP2565884A3/de
Application granted granted Critical
Publication of EP2565884B1 publication Critical patent/EP2565884B1/de
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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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F38/24—Voltage transformers
    • H01F38/26—Constructions
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F2038/305—Constructions with toroidal magnetic core
    • 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
    • H01F38/34—Combined voltage and current transformers

Definitions

  • the invention deals with a high voltage voltage coil which is an element of a voltage transformer used in a combined instrument transformer which comprises of a current transformer and a voltage transformer located in a common enclosure.
  • a combined instrument transformer is applicable in high voltage electric power measuring systems.
  • a combined instrument transformer known from patent description PL193711 comprises an inductive toroidal core type current transformer and an inductive three-leg core type potential transformer, located in the upper and lower parts of the combined instrument transformer, respectively, in metal enclosures and it has an insulator filled with insulating medium in which equipotential screens of an electrically conductive material are located.
  • the primary winding of the voltage transformer and the secondary winding of the voltage transformer are wound on a cylindrical tube of an insulating material, located on the central column of the core which is a composition of two rectangular cores.
  • the equipotential screens are built into an insulating material spread over the high voltage output lead of the voltage transformer and they are connected with the equipotential screens built into the insulating material spread over the tube with the output leads of the secondary windings of the current transformer.
  • the insulating medium is located in the space between the insulated windings of the current and voltage transformers and their metal enclosures as well as in the space between the insulated input leads of the windings of the transformers running along the insulator and the internal surface of the insulator.
  • JUK123 made by ABB Sp.z o.o.
  • the current coil of the current transformer which surrounds the current lead, is located in a metal enclosure.
  • Output leads of the windings of the current coil are taken through a current bushing in the form of a metal tube to a terminal box connected to the casing of the voltage transformer.
  • the current bushing is connected with the metal enclosure through a screw joint in which the external thread is made at the end of the bushing tube, and the internal thread is made in the opening of a joining sleeve which is tightly fitted in the opening made in the metal casing of the current coil.
  • the screw joint of the current bushing with the joining sleeve enables the appearance of blades of the protruding thread and edges of the sleeve, which may weaken the strength of the paper-and-oil insulation at the place where bushing joins the current coil enclosure.
  • the voltage transformer comprises a voltage coil in which the primary winding is wound on the secondary winding, which are wound on a cylindrical tube of an insulating material. Inside the tube there are the columns of two magnetic cores which form a jacket core system for the windings of the voltage transformer. At the bottom, the voltage transformer is closed by the bottom part of the metal casing with four openings used to fasten the transformer to the frame by means of bolts.
  • the voltage coil windings are provided with an upper screen located inside the voltage coil in the shape of a cylinder and covering the final layer of the winding, made from a copper sheet with wires soldered to the edges of the sheet to avoid sharp edges.
  • the output lead of the voltage coil is the high voltage bushing of the coil, which is located in an insulating material with equipotential screens made from aluminum sheets which after being wound into the insulating material form cylindrical covers situated centrically around the longitudinal axis of the voltage bushing.
  • the external screen of the voltage coil was formed of aluminum foil and was connected with the final aluminum screen situated on the voltage bushing.
  • an external screen made of black semiconducting paper which is located outside the voltage coil and which is electrically connected with the final, wound on the largest diameter, aluminum screen situated on the voltage bushing.
  • a head-type combined instrument transformer comprises a current part in the form of a current instrument transformer and a voltage part in the form of a voltage instrument transformer.
  • the current instrument transformer is placed in a metal enclosure situated in the upper part of the combined instrument transformer.
  • the voltage instrument transformer is situated in the bottom part of the combined instrument transformer in a cast-aluminum bottom tank.
  • the internal and external edges of the ring of the upper screen are rounded, and the rounding radius "R1" of the external edge is larger than the rounding radius "R2" of the internal edge.
  • the upper screen is made as an aluminum cast.
  • the equipotential screens of the bushing are situated in relation to the rod axis in such way that the line connecting the upper edges of the screens located in the insulating material is situated at an acute angle to the rod axis and at the same time it is parallel to the line connecting the bottom edges of these screens.
  • the angle " ⁇ " of the mutual overlapping of the longitudinal edges of the equipotential screens of the bushing is less than 60°.
  • the insulating material of the bushing is paper insulation whose bands are wound stepwise on the bushing rod, narrowing towards both ends of the rod.
  • the final bushing screen made of conducting material is permanently connected with the copper tape on the external side outline of the voltage coil.
  • the output leads of the copper tape are the end of the band in the form of copper plaiting which is permanently fixed to an insulating connector.
  • the external screen of the coil which reflects the outer surface of the coil, is made of a semiconducting paper.
  • a combined instrument transformer comprising a current transformer, an insulator and a voltage transformer comprising the high voltage coil according to claims 1 through 9.
  • fig. 1 shows the combined instrument transformer in half-view and in broken-out frontal half section showing the insulator in section
  • fig. 2 the voltage coil in side section
  • fig. 3 the voltage coil in frontal view partially broken-out
  • fig. 4 the upper screen of the voltage coil in frontal view
  • fig. 5 the upper screen of the voltage coil in frontal view
  • the combined instrument transformer comprises a current transformer 1 and a voltage transformer 2 located in the upper and lower parts of the transformer, respectively, in metal enclosures 1a and 2a, 2b and it has an insulator 3 filled with an insulating medium 4.
  • the current transformer 1 is located in a metal head 5 in which there is at least one cylindrical core 6. Secondary windings 7 of the current transformer 1 are wound on the core 6. The windings 7 with the core 6 are located in a metal enclosure 8.
  • a primary winding 9 whose terminal is connected to the metal head 5 of the instrument transformer runs through the center of the cores.
  • the output leads of the secondary windings 7 of the instrument transformer 1 are brought into a metal tube 10 which is a current bushing of the transformer 1, which is located inside the insulator 3.
  • the output leads of the secondary windings 7 are brought outside the tube 10 at its other end and they are connected with the external terminals located in a terminal box attached to the lower part of the enclosure 2b of the voltage transformer 2, which is not shown in the drawing.
  • a compensatory bellows 11 used to compensate variations in the volume of the insulating medium 4 which can be insulating oil, sulfur hexafluoride, or nitrogen.
  • the voltage transformer comprises a voltage coil 12 with a primary winding 13 wound onto a secondary winding 14, which are wound on a cylindrical tube 15 of insulating material. Inside the tube 15 there are placed the columns of two magnetic cores 16 which make a jacket-core system for the windings of the voltage transformer 2.
  • the windings of the coil 12 have the shape of a trapeze, which is shown in fig. 2 .
  • the shorter base of the trapeze is galvanically connected with the inner surface of an upper screen 17 of the voltage coil.
  • the upper screen 17 is formed in the shape of a metal ring with a gap 18 which prevents the formation of a shorted coil, and it comprises a connecting element 19 which has the shape of a truncated cone whose larger-diameter base is situated on the external surface of the ring.
  • a threaded port 20 into which the threaded end of a conducting rod 21 constituting the voltage bushing of the voltage coil is screwed.
  • the whole upper screen 17 is made as an aluminum casting.
  • the ring edges are rounded, and the radius of the rounding of the external edge R1 is bigger than the radius of the rounding of the internal edge R2, which allows to minimize the intensity of the electric field on the edges of the screen 17.
  • the connecting element 19 contains also a transverse port 22 which is used to introduce a set screw into it.
  • the windings of the voltage transformer 2 with the upper screen 17 are insulated with an insulating material 23 in the form of paper-and-oil insulation.
  • the conducting rod 21 that is screwed into the port 20 is situated along its own length in a bushing insulation 24 in the form of paper bands wound onto the rod 21.
  • equipotential screens 25 in the form of sheets of conducting material, forming cylindrical screens of equal length, with the exception of a shorter external screen, which are situated parallel to one another and to the axis of the rod 22.
  • the line joining the upper edges of the equipotential screens, with the exception of the external screen which is shorter than the other screens, is situated at an acute angle to the axis of the rod 21 and at the same time parallel to the line connecting the bottom edges of the equipotential screens.
  • the longitudinal edges of the equipotential screens overlap one another, which is shown in fig. 7 , but these edges do not touch because there is a layer of a thickness of one insulation paper sheet between the overlapping screen layers.
  • the angle ⁇ at which the edges of the screens overlap should not exceed 60°, and preferably it should be within the range of 15-45°.
  • the presented system of cylindrical equipotential screens 25, made of aluminum foil, and their mutual position in the paper insulation 24 enable the achievement of considerable homogeneity of the electric field in the voltage bushing of the voltage coil, which greatly improves the quality of the combined instrument transformer.
  • the bushing insulation 24 is gradated on both sides, i.e. the upper and the lower sides, and it is connected with the insulation material 23 of the voltage coil forming the main insulation of the voltage transformer 2, in which the lower gradated side of the insulation 24 is comprised.
  • an external screen 26 of a shape reflecting the coil surface.
  • a conducting copper tape 27 is evenly wound onto the external screen 26, which is shown in fig. 8, 9 , 10 and 11 .
  • the tape 27 twists around the front surfaces of the coil and covers the outer side outline of the coil, the sections of the band that intersect on the side outline of the coil being permanently joined with one another e.g. by soldering.
  • One end of the band 27 is taken outside the insulation and it is fixed to the insulating connector 28, to which also the end of the band 29 in the form of a copper plaiting, constituting the conducting outlet of the external screen 26, is fixed.
  • the final, shorter screen 25 of the conducting material is permanently connected with the copper tape 27, which is not shown in the drawing.
  • pressboard disks 30 through which the band is threaded are fixed to both sides of the voltage coil.
  • the function of the copper tape 27 is to conduct an electric charge to earth and to equalize potentials on the voltage coil.
  • the use of the copper tape 27 permits an even distribution of the potential on the voltage coil.
  • the combined instrument transformer is closed by the lower part of the casing 2b with four openings used to fix the transformer to the frame by means of bolts, not shown in the drawing.
  • the equipotential screens 25 built into the insulation 24 surrounding the conducting rod 21 of the voltage transformer are not galvanically connected.
  • the design and shape of the upper screen 17 located in the voltage coil 12 in the paper-and-oil insulation material 23, as well as the way of connecting it with the voltage bushing wound on the metal rod 21 where the thread of the metal rod 21 is completely hidden in the connecting element 19, and the shape of the primary winding of the voltage transformer 13 ensure the optimum distribution of the electric field.
  • the upper screen 17 functions as a support structure for the bushing of the voltage coil.
  • the threaded connection can be a metric thread, a unified screw thread, or any other thread depending on the design needs.
  • the system of the screens 25 of a design in which the longer sides of the screens overlap ensures an even distribution of voltage gradients at the ends of the screens.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)

Claims (10)

  1. Eine Hochspannungsspule mit einem magnetischen Kern (16) und einer Primärwicklung (13), die auf eine Sekundärwicklung (14) gewickelt ist und von einer oberen Abschirmung (17) umgeben ist, an der eine Durchführung eines Hochspannungswandlers in Form eines leitenden Stabes (21) befestigt ist, der in einer Durchführungsisolierung (24) untergebracht ist, in welcher auf verschiedenen Ebenen zylindrische, axial ausgerichtete äquipotentielle Schirme (25) angeordnet sind, wobei die Primärwicklung (13) zusammen mit der oberen Abschirmung (17) in einem Isolationsmaterial (23) angeordnet ist, welches Isolationsmaterial (23) von einer äußeren Abschirmung (26) bedeckt ist, dadurch gekennzeichnet, dass die obere Abschirmung (17) die Form eines Ringes mit einer Lücke (18) hat und an dem Ring ein Verbindungselement (19) befestigt ist, das die Form eines Kegelstumpfes hat, dessen größere Basis auf der Außenfläche des die obere Abschirmung (17) bildenden Rings angeordnet ist und mit einem Kegel mit einer axialen Öffnung (20) ausgestattet ist, in die das mit einem Gewinde versehene Ende des leitenden Stabes (21) eingeschraubt ist, wobei die äquipotentiellen Schirme (25) zentrisch um den Stab (21) angeordnet sind und überlappende längs verlaufende Ränder, die sich an keinem einzigen Punkt berühren, haben, und darüber hinaus um das Isolationsmaterial (23) und die äußere Abschirmung (26) der Spannungsspule ein Kupferband (27) gewickelt ist.
  2. Eine Spule gemäß Anspruch 1, dadurch gekennzeichnet, dass die inneren und äußeren Ränder des Ringes der oberen Abschirmung (17) abgerundet sind und der Rundungsradius (R1) des äußeren Randes größer als der Rundungsradius des inneren Randes (R2) ist.
  3. Eine Spule gemäß Anspruch 2, dadurch gekennzeichnet, dass die obere Abschirmung (17) aus Aluminiumguss ausgeführt ist.
  4. Eine Spule gemäß Anspruch 1, dadurch gekennzeichnet, dass die äquipotentiellen Schirme (25) im Bezug auf die Achse des Stabes in der Weise angeordnet sind, dass die Verbindungslinie der oberen Ränder der Schirme (25), die in dem Isolationsmaterial (24) untergebracht sind, in einem spitzen Winkel zur Achse des Stabes (21) und gleichzeitig parallel zur Verbindungslinie der unteren Ränder dieser Schirme angeordnet ist.
  5. Eine Spule gemäß Anspruch 4, dadurch gekennzeichnet, dass der Winkel (α) der gegenseitigen Überlappung der längs verlaufenden Ränder der äquipotentiellen Schirme (25) geringer als 60° ist.
  6. Eine Spule gemäß Anspruch 1, dadurch gekennzeichnet, dass das Isolationsmaterial (24) der Spulendurchführung aus einer Papierisolation besteht, deren Bänder stufenweise auf den Stab (21) gewickelt sind, wobei sie in Richtung auf die beiden Enden des Stabs (21) schmaler werden.
  7. Eine Spule gemäß Anspruch 1, dadurch gekennzeichnet, dass der letzte Schirm aus leitendem Material (25) dauerhaft mit dem Kupferband (27) verbunden ist, das auf die Außenprofil der Spannungsspule gewickelt ist.
  8. Eine Spule gemäß Anspruch 1, dadurch gekennzeichnet, dass die Ausgangsleiter des Kupferbandes (27) durch das Ende des Bandes (29) in der Form eines Kupfergeflechts gebildet werden, das dauerhaft an einem isolierenden Verbinder (28) befestigt ist.
  9. Eine Spule gemäß den Ansprüchen 1 - 8, dadurch gekennzeichnet, dass der äußere Schirm (26), der die Außenfläche der Spule nachbildet, aus halbleitendem Papier hergestellt ist.
  10. Ein kombinierter Messwandler, der aus einem Stromwandler (1), einem Isolator (3) und einem Spannungswandler (2) besteht, welcher die Hochspannungsspule gemäß irgendeinem Anspruch von 1 bis 9 enthält.
EP12460050.3A 2011-08-31 2012-08-08 Hochspannungsspule Active EP2565884B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12460050T PL2565884T3 (pl) 2011-08-31 2012-08-08 Cewka napięciowa wysokiego napięcia

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL120302U PL66956Y1 (pl) 2011-08-31 2011-08-31 Cewka napieciowa wysokiego napiecia
PL397241A PL221558B1 (pl) 2011-12-05 2011-12-05 Sposób wykonywania izolacji cewki napięciowej przekładnika WN i przyrząd do wykonywania izolacji cewki napięciowej

Publications (3)

Publication Number Publication Date
EP2565884A2 EP2565884A2 (de) 2013-03-06
EP2565884A3 EP2565884A3 (de) 2013-10-09
EP2565884B1 true EP2565884B1 (de) 2014-05-14

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ID=46801405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12460050.3A Active EP2565884B1 (de) 2011-08-31 2012-08-08 Hochspannungsspule

Country Status (2)

Country Link
EP (1) EP2565884B1 (de)
PL (1) PL2565884T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105206408B (zh) * 2015-10-09 2017-03-29 南京国电南自电网自动化有限公司 一种用于对抗工频磁场骚扰的电压互感器的制造方法
EP3208816A1 (de) * 2016-02-17 2017-08-23 General Electric Technology GmbH Stromwandler mit sekundären transformationskomponenten in seiner basis

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382199A (en) * 1942-06-09 1945-08-14 Gen Electric Electric apparatus
FR1102450A (fr) * 1953-06-18 1955-10-20 Moser Glaser & Co Ag Appareil ou groupe d'appareils électriques haute tension
US3028568A (en) * 1960-09-28 1962-04-03 Gen Electric Potential transformer
FR1288329A (fr) * 1961-03-24 1962-03-24 Reyrolle A & Co Ltd Procédé d'isolement de conducteurs haute tension et éléments isolants réalisés selon ce procédé
US3668513A (en) * 1970-03-31 1972-06-06 Tokyo Shibaura Electric Co Upright type bushing current transformer
US3686600A (en) * 1971-02-22 1972-08-22 Westinghouse Electric Corp Potential transformer
PL193711B1 (pl) 2000-03-24 2007-03-30 Abb Sp Zoo Przekładnik kombinowany
CH698970A1 (de) * 2008-06-04 2009-12-15 Trench Switzerland Ag Hochspannungs-Messwandler mit flexibler Isolierung.
EP2239744A1 (de) * 2009-04-06 2010-10-13 ABB Technology AG Mehrbereichsstrommesswandler

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Publication number Publication date
EP2565884A2 (de) 2013-03-06
PL2565884T3 (pl) 2014-08-29
EP2565884A3 (de) 2013-10-09

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