EP3196901B1 - Hochspannungsanlage - Google Patents
Hochspannungsanlage Download PDFInfo
- Publication number
- EP3196901B1 EP3196901B1 EP16152621.5A EP16152621A EP3196901B1 EP 3196901 B1 EP3196901 B1 EP 3196901B1 EP 16152621 A EP16152621 A EP 16152621A EP 3196901 B1 EP3196901 B1 EP 3196901B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- high voltage
- field forming
- jacket
- assembly
- bushing
- 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
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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
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/26—Lead-in insulators; Lead-through insulators
- H01B17/28—Capacitor type
Definitions
- the present invention relates to a high voltage assembly according to the preamble of claim 1.
- Known high voltage assemblies comprise a high voltage bushing with a bushing body surrounding a high voltage conductor and containing a paper insulation. An outer side of the bushing body is coated at least in a region with a coating forming a coating layer. The coating layer has a greater electrical conductivity than the bushing body.
- US 2013/0240249 A1 shows a high voltage assembly as defined by the preamble of claim 1.
- US 5 227 584 A discloses a condenser type barrier for field control of connection of a transformer bushing to the conductor of a transformer winding in converter transformers.
- the condenser barrier and transformer in combination comprise a condenser body of insulating material with condenser layers of foil type concentrically laid therein.
- the condenser barrier is in the form of a solid of revolution with an outer circular cylindrical shape and from one end with a first, inwardly-directed straight frustrum of a cone with a largest base area at the end of the condenser barrier, and lower insulator having an inner portion in the shape of a straight frustrum of a cone having a surface spaced substantially parallel to the surface of said inwardly directed straight frustrum of the cone to form a gap therebetween and a substantially cylindrical of said lower insulator attached to said cone portion, and from the other end with a second, inwardly-directed straight frustrum of a cone with a largest base area at the other end of the condenser barrier.
- the space between each of the straight frustrums of the cones in the condenser barrier is concentrically arranged in an open, inner, straight circular cylinder with a sectional area equal to the smallest bases of the straight frustoms of the cones.
- the transformer comprises a transformer casing and a fastening flange connected to said substantially cylindrical portion, and a an intermediate flange interconnecting said transformer casing and said fastening flange to surround said condenser barrier.
- the condenser type barrier further comprises a tube extending from the narrow portion of said second straight frustrum of the cone through said transformer casing and said conductor passing through said tube, said tube being electrically connected to said conductor and to said condenser type barrier.
- barrier systems which are arranged inside a high voltage assembly are known to reduce space between elements of the high voltage assembly by controlling the electrostatic field.
- These barrier systems comprise several layers of transformerboard barriers.
- a high voltage assembly which comprises a metal enclosure containing an active component and being connected to ground potential, a high voltage bushing comprising a high voltage conductor, the high voltage bushing passing through an opening of the metal enclosure.
- a field forming jacket is arranged inside the metal enclosure to receive at least partly the high voltage bushing.
- the field forming jacket is configured to provide an insulation gap between an inner surface of the field forming jacket and an outer surface of the high voltage bushing.
- the field forming jacket comprises a field forming layer with a first electrical connection to the ground potential and a second electrical connection to a high voltage potential of the high voltage conductor.
- the field forming layer provides that the electric potential distribution is homogenized already in the insulation gap and beyond.
- a barrier system arranged in the metal enclosure is mechanically protected when connecting the high voltage bushing to the high voltage assembly. As the barrier system is protected from being damaged loosening of cellulose material is prevented. Therefore the probability of a respective malfunction of the high voltage assembly is reduced.
- the field forming jacket therefore simplifies the construction of a barrier system and simultaneously improves the assembly of the high voltage bushing at construction site. Moreover, the proposed field forming jacket may replace a barrier system. By reducing the complexity of or even replacing the barrier system the production costs for the whole high voltage assembly are reduced.
- the high voltage assembly is therefore suitable for high voltage direct current, HVDC, applications. But even in a test environment with alternating current or lightning impulse voltages the proposed field forming jacket enables the high voltage assembly to resist the resulting electrical stresses.
- the first electrical connection between the field forming layer and ground potential comprises a disconnecting device for disconnecting the field forming layer from ground potential.
- the field forming jacket comprises a support layer on which the field forming layer is arranged, wherein the support layer is made of a non-hygroscopic material.
- the support layer therefore simplifies handling and processing. This means, that there is no need to dry the material like it would be necessary with hygroscopic material like cellulose.
- electrically insulating spacer elements are arranged between the high voltage bushing and the field forming jacket.
- the spacer elements advantageously provide the insulation gap and simultaneously provide a protection against a mechanical damage when mounting the high voltage bushing.
- the field forming layer is arranged on an outer surface of the field forming jacket. A mechanical damage of the field forming layer when mounting the high voltage bushing is therefore prevented.
- the field forming layer is arranged on the inner surface of the field forming jacket.
- the insulation gap is connected to an interior space of the metal enclosure for an exchange of an insulation fluid.
- the insulation fluid is arranged in the insulation gap, wherein an electrical conductivity of the field forming layer is greater than an electrical conductivity of the insulation fluid.
- the electrical conductivity of the field forming layer is greater than an electrical conductivity of the outer surface of the high voltage bushing.
- FIG 1 shows a schematic sectional view of a high voltage assembly 2.
- the high voltage assembly 2 may be a high voltage transformer or a high voltage reactor like a series reactor, a shunt reactor or a smoothing reactor.
- the high voltage assembly 2 comprises an active component not shown, wherein the active component comprises for example a transformer core and transformer windings.
- the high voltage assembly 2 comprises a metal enclosure 4 which is filled with an insulation fluid like transformer oil in an operational state of the high voltage assembly 2.
- the metal enclosure 4 is connected to ground potential 3.
- FIG 1 it is shown the high voltage assembly 2 in a state during assembly without a high voltage bushing received in an opening 6 of the metal enclosure 4.
- a conically-shaped field forming jacket 8 extends along a central axis 10 and is essentially rotationally symmetric to the central axis 10.
- An inner surface 14 is arranged with respect to the opening 6 such that it is formed a receiving chamber 12 for receiving at least a part of the high voltage bushing.
- the field forming jacket 8 comprises a support layer 16 preferably of insulating, non-hygroscopic material and a field forming layer 18. Both the support layer 16 as also the field forming layer 18 extend along the conically tapering form of the field forming jacket 8.
- the support layer 16 may be made of fiber reinforced epoxy resin or other suitable non-hygroscopic material.
- the field forming layer 18 provides an electrical conductivity greater than an electrical conductivity of the insulation fluid surrounding the field forming jacket 8 and could be a slightly conducting varnish. Moreover, the field forming layer 18 provides the electrical conductivity greater than an electrical conductivity of an outer surface of the high voltage bushing. The electric resistivity of the field forming layer 18 is equal to or smaller than 1*10 10 Ohm * m. Moreover, the field forming layer 18 provides the electrical conductivity greater than an electrical conductivity of the support layer 16.
- the field forming jacket 8 comprises insulating spacer elements 20 arranged at the inner surface 14 of the field forming jacket 20.
- the spacer elements 20 are schematically shown and provide an insulation gap 22.
- the spacer elements 20 are arranged in two planes 24, 26, each perpendicular to the central axis 10 and being spaced apart to receive at least a part of an outer surface of the high voltage bushing. In a preferred embodiment there are arranged three spacer elements 20 in one of the planes 24, 26.
- a contact element 28 is arranged to electrically contact a high voltage conductor of the high voltage bushing.
- the contact element 28 is electrically contacted to a high voltage conductor 30 which is electrically connected to the active component of the high voltage assembly 2.
- the contact element 28 is preferably configured to provide a detachable electrical connection.
- the connector element 28 is arranged inside the field forming jacket 8.
- a first ring-shaped conducting layer 32 is arranged at a first end of the jacket 8 and is electrically connected to the field forming layer 18, wherein the first end is arranged in the direction of the opening 6.
- the first ring-shaped conducting layer 32 is electrically connected via a first connection 34 to ground potential 3. This connection to ground potential 3 can be established by connecting the first connection 34 to the inner surface of the metal enclosure 4.
- the first connection 34 to ground potential 3 can be opened for a diagnosis of the high voltage bushing via a disconnecting device 36.
- the disconnecting device 36 may be implemented as a screw plug for electrically connecting and disconnecting the first connection 34 to the metal enclosure 4 and therefore to ground potential 3.
- the disconnecting device 36 is placed outside the metal enclosure 4, wherein the first connection 34 is guided through an insulated and closed opening 35.
- a second ring-shaped conducting layer 38 is arranged at a second end of the jacket 8 and is electrically connected to the field forming layer 18, wherein the second end is arranged remote from the opening 6.
- the second ring-shaped conducting layer 38 is electrically connected via a second connection 40 to the contact element 28.
- the conducting layers 32 and 24 may comprise a conducting paint like a silverpaint or a carbon paint.
- the conductive layers 32 and 34 comprise a conductive foil like a metal foil or carbonized paper.
- the field forming jacket 8 comprises the field forming layer 8 with the first connection 34 to the ground potential 3 and the second connection 40 to a high voltage potential of the high voltage conductor of the high voltage bushing.
- the field forming layer 18 is shown to be arranged at an outer surface of the field forming jacket 8.
- the field forming layer 18 can be also arranged at the inner surface 14 of the jacket 8 or even inside two support layers.
- the field forming jacket comprises a first field forming layer 18 on the inner surface 14 of the jacket 8 and a second field forming layer 18 on the outer surface of the jacket 8.
- the field forming jacket 8 is surrounded by a barrier system 42 comprising single barrier elements 44 extending rotationally symmetric to the central axis 10.
- the barrier system 42 serves to build channels for the insulation fluid and helps to reduce distances between the components of the high voltage assembly 2 by reducing leakage inductances.
- the field forming jacket 8 helps to reduce the complexity of the barrier system 42 and may supersede a respective barrier system 42.
- the opening 6 is arranged in a plane 7, wherein the plane 7 is inclined with respect to a horizontal xy-plane and with respect to a vertical yz-plane. Therefore the high voltage bushing has to be guided along the central axis 10 to be arranged inside the receiving chamber 12. Especially for large transformers the high voltage bushing is mounted on site. On site cranes are able to essentially move the high voltage bushing along a vertical axis or in a horizontal plane. This implies that mounting the high voltage bushing along the central axis 10 becomes difficult.
- the proposed field forming jacket 18 protects further elements inside the high voltage assembly 2 from being damaged.
- the opening 6 can be also arranged in an essentially horizontal xy-plane or an essentially vertical yz-plane or xy-plane.
- Figure 2 shows a schematic sectional view of the high voltage assembly 2 with the high voltage bushing 50 received in the high voltage assembly 2.
- the high voltage conductor 52 is electrically connected to the contact 28.
- a flange 56 establishes the mechanical connection of the high voltage bushing 50 to the metal enclosure 4.
- the high voltage bushing 50 comprises the high voltage conductor 52 which extends along the central axis 10.
- the high voltage conductor 52 is surrounded by field guiding elements 54, wherein the field guiding elements 54 are arranged in an insulating material. Therefore the high voltage bushing 50 can be referred to as a condenser bushing.
- the insulating gap 22 is arranged between the inner surface 14 and the outer surface 58 of the high voltage bushing 50.
- the spacer elements 20 are circumferentially spaced apart to establish an exchange of insulation fluid in the insulation gap 22. According to the embodiment shown an exchange of insulation fluid is possible between an interior space 60 of the metal enclosure 4 and the insulation gap 22.
- the arrows 62 and 64 indicate this insulation fluid exchange.
- the insulating gap 22 is hermetically separated from the interior space 60 of the metal enclosure 4 and is filled with a further insulation fluid.
- the field forming jacket 8 is shown with a conical shape and an essentially constant distance to the outer surface 58 of the high voltage bushing 50.
- the field forming jacket 8 does not have to follow this constraint and may be of cylindrical or other tubular shape with a varying distance between the outer surface 58 and the inner surface 14.
- Figure 3 shows a schematic sectional view of the high voltage assembly 2 with the high voltage bushing 50 received in the high voltage assembly 2.
- the lines 66 of the electric potential are influenced by the field forming layer 18 of the field forming jacket 8 such that the electric potential according to the lines 66 is homogenized. This homogenization of the electric field results in a better utilization of the insulation material and thus the possibility to reduce required space and volume. Additionally, if barriers are required in the field space, complexity of those barriers can be largely reduced.
- the toroidal structure 68 is connected to high voltage for an experimental setup.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
Claims (9)
- Hochspannungsanordnung (2), insbesondere ein Hochspannungstransformator oder ein Hochspannungsreaktor, Folgendes umfassend:- eine Metallumhüllung (4), eine aktive Komponente enthaltend und verbunden mit Erdpotential (3),- eine Hochspannungsdurchführung (50), einen Hochspannungsleiter (52) umfassend, wobei die Hochspannungsdurchführung (50) durch eine Öffnung (6) der Metallumhüllung (4) durchläuft,- eine feldausbildende Ummantelung (8), die innerhalb der Metallumhüllung (4) angeordnet ist, um wenigstens teilweise die Hochspannungsdurchführung (50) zu empfangen, dadurch gekennzeichnet,- dass die feldausbildende Ummantelung (8) zum Bereitstellen eines Isolierspalts (22) zwischen einer inneren Oberfläche (14) der feldausbildenden Ummantelung (8) und einer äußeren Oberfläche (58) der Hochspannungsdurchführung (50) konfiguriert ist und- dass die feldausbildende Ummantelung (8) eine feldausbildende Schicht (18) mit einer ersten elektrischen Verbindung (34) zu dem Erdpotential (3) und einer zweiten elektrischen Verbindung (40) zu einem Hochspannungspotential des Hochspannungsleiters (52) umfasst.
- Hochspannungsanordnung (2) nach Anspruch 1, wobei die erste elektrische Verbindung (34) zwischen der feldausbildenden Schicht (18) und dem Erdpotential (3) eine Trennvorrichtung (36) zum Trennen der feldausbildenden Schicht (18) vom Erdpotential (3) umfasst.
- Hochspannungsanordnung (2) nach Anspruch 1 oder 2, wobei die feldausbildende Ummantelung (8) eine Trägerschicht (16) umfasst, auf der die feldausbildende Schicht (18) angeordnet ist, und wobei die Trägerschicht (16) aus einem nicht hygroskopischen Material gefertigt ist.
- Hochspannungsanordnung (2) nach einem der vorhergehenden Ansprüche, wobei elektrisch isolierende Abstandhalterteile (20) zwischen der Hochspannungsdurchführung (50) und der feldausbildenden Ummantelung (8) angeordnet sind.
- Hochspannungsanordnung (2) nach einem der vorhergehenden Ansprüche, wobei die feldausbildende Schicht (18) auf einer äußeren Oberfläche der feldausbildenden Ummantelung (8) angeordnet ist.
- Hochspannungsanordnung (2) nach einem der Ansprüche 1 bis 4, wobei die feldausbildende Schicht (18) auf der inneren Oberfläche (14) der feldausbildenden Ummantelung (8) angeordnet ist.
- Hochspannungsanordnung (2) nach einem der vorhergehenden Ansprüche, wobei der Isolierspalt (22) mit einem inneren Raum (60) der Metallumhüllung (4) für einen Austausch eines Isolierfluids verbunden ist.
- Hochspannungsanordnung (2) nach einem der vorhergehenden Ansprüche, wobei das Isolierfluid in dem Isolierspalt (22) angeordnet ist, und wobei eine elektrische Leitfähigkeit der feldausbildenden Schicht (18) größer als eine elektrische Leitfähigkeit des Isolierfluids ist.
- Hochspannungsanordnung (2) nach einem der vorhergehenden Ansprüche, wobei die elektrische Leitfähigkeit der feldausbildenden Schicht (18) größer als eine elektrische Leitfähigkeit der äußeren Oberfläche (58) der Hochspannungsdurchführung (50) ist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16152621.5A EP3196901B1 (de) | 2016-01-25 | 2016-01-25 | Hochspannungsanlage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16152621.5A EP3196901B1 (de) | 2016-01-25 | 2016-01-25 | Hochspannungsanlage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3196901A1 EP3196901A1 (de) | 2017-07-26 |
EP3196901B1 true EP3196901B1 (de) | 2018-04-04 |
Family
ID=55236255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16152621.5A Active EP3196901B1 (de) | 2016-01-25 | 2016-01-25 | Hochspannungsanlage |
Country Status (1)
Country | Link |
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EP (1) | EP3196901B1 (de) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5227584A (en) * | 1989-06-19 | 1993-07-13 | Asea Brown Boveri Ab | Barrier of condenser type for field control in transformer bushing terminals |
EP2431982B1 (de) * | 2010-09-21 | 2014-11-26 | ABB Technology AG | Steckbare Durchführung und Hochspannungsanlage mit einer solchen Durchführung |
DE102012204052B4 (de) | 2012-03-15 | 2022-12-29 | Siemens Energy Global GmbH & Co. KG | Hochspannungsdurchführung mit leitenden Einlagen für Gleichspannung und Verfahren zu ihrer Herstellung |
-
2016
- 2016-01-25 EP EP16152621.5A patent/EP3196901B1/de active Active
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EP3196901A1 (de) | 2017-07-26 |
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