EP3335230B1 - Single-pole voltage transformer - Google Patents

Single-pole voltage transformer Download PDF

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Publication number
EP3335230B1
EP3335230B1 EP16744576.6A EP16744576A EP3335230B1 EP 3335230 B1 EP3335230 B1 EP 3335230B1 EP 16744576 A EP16744576 A EP 16744576A EP 3335230 B1 EP3335230 B1 EP 3335230B1
Authority
EP
European Patent Office
Prior art keywords
central element
sheds
bushing
transformer
projection
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
EP16744576.6A
Other languages
German (de)
French (fr)
Other versions
EP3335230A1 (en
Inventor
Jaroslaw CHORZEPA
Piotr LISZEWSKI
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 Schweiz AG
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ABB Schweiz AG
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Publication date
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Publication of EP3335230A1 publication Critical patent/EP3335230A1/en
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Publication of EP3335230B1 publication Critical patent/EP3335230B1/en
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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
    • 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

Definitions

  • the invention deals with a MV single-pole voltage transformer in resin insulation.
  • the voltage transformer is applicable in medium voltage measuring and protection electric power systems and as a power supply component in medium voltage switch-disconnector systems.
  • TJO 7 manufactured by ABB Sp. z o.o. That transformer is tightly closed in an enclosure made as a resin cast comprising a central element integrated with a base and with adjacent side elements.
  • the transformer enclosure is mounted on a plate.
  • the central element has a projection in the shape of a truncated cone which is fitted with a complete high voltage terminal.
  • a high voltage bushing is detachably attached to the projection.
  • the complete high voltage terminal is galvanically connected with the beginning of the high voltage winding.
  • the end of the high voltage winding is galvanically connected inside the enclosure with an earthing terminal located in a box attached to the base.
  • That transformer has at least one secondary winding.
  • the output lead of the secondary winding(s) is on the transformer cast and it is protected by a tight cover. Additionally, there are four handles located on the transformer base, which make the transport of the transformer easier.
  • the creepage distance of the TJO 7 transformer is equal to the distance between the bushing terminal and the nearest earthed metallic part, i.e. the terminal box of the earthed plate attached to the base, measured along the surface of the bushing and the surface of the transformer enclosure.
  • the creepage distance can be increased by using a longer bushing, which increases the bending moment at the place where the bushing is mechanically connected to the transformer body because of the longer arm of the loading force applied to the bushing terminal during its operation.
  • the essence of the invention having a single-pole voltage transformer tightly closed in an enclosure made as a resin cast comprising a central element integrated with a base and with adjacent side elements of the cast, wherein the central element has a projection in the shape of a truncated cone to which a high voltage bushing is detachably attached, is that the central element has the form of a circular cylinder situated with its side wall horizontally on the base plane, and the place of the contact of the central element with the base plane is screened by circumferential bottom sheds over which there are located side elements of the cast forming side sheds which are integrated with the front surfaces of the central element, and above the side sheds there is situated a circumferential top shed surrounding a fragment of the side surface of the central element.
  • the side walls of the base situated along the side walls of the central element are fitted with oblong sockets having the shape of semicircular longitudinal hollows.
  • the circumferential bottom sheds, the side sheds and the circumferential top shed are situated parallel to one another and on planes parallel to the surface of the base and they have a fixed inter-shed spacing and an alternately variable overhang between the adjacent sheds.
  • the high voltage busing has in its bottom part, the high voltage bushing has a centrally situated cavity in the shape of a truncated cone, which shape corresponds to the shape of the projection of the central element.
  • the bushing has been mounted on the transformer, its longitudinal axis coincides with the longitudinal axis of the projection.
  • the surface of the contact between the projection and the cavity in the bushing is sealed with an insulating and sealing compound.
  • the advantage of the single-pole voltage transformer according to the invention is that it has longer creepage distance while maintaining the outside dimensions of the transformer, which eliminates the necessity to use longer bushings, minimizes the bending force in the place of the mechanical connection between the bushing and the transformer body, and eliminates the risk of damage to the transformer in the place of the mechanical connection between the bushing and the transformer body.
  • the advantage of the single-pole voltage transformer according to the invention is that the transformer enclosure is fitted with sockets used to fix the transformer in a mounting bracket by means of which the transformer can be turned and positioned in such way that the projection points downwards so that the sealing compound is evenly distributed on the contact surface of the cavity in the bushing and on the projection when a connection is screwed onto the transformer projection terminal.
  • the single-pole voltage transformer 1 comprises a tight enclosure 2 made as a resin cast with a central element of the casing 2a and an enclosure base 2b and side elements of the base 2c.
  • the enclosure element 2a has the form of a circular cylinder situated horizontally on the base 2b.
  • the base 2b has the form of a cuboid with rounded edges.
  • a cuboidal side element 2d integrated with the base 2b adjoins the base, more specifically one of its side walls.
  • a terminal box 3 is attached to a side wall of the element 2d of the enclosure 2. Inside the box 3, in a side wall of the element 2d there are located two complete terminals nn 4, 5 and an earthing terminal 6.
  • the terminals 4 and 5 are galvanically connected inside the enclosure 2 with a low voltage winding nn 7.
  • the winding nn 7 is wound on an insulating tube 8 fixed on a core 9 secured in a yoke 10 located in the enclosure 2.
  • the earthing terminal 6 is galvanically connected inside the enclosure 2 with the yoke 10 and the core 9.
  • assembly elements 12 in the form of threaded conducting inserts which are used to fix the transformer 1 to a support structure in the form of a plate or rails, not shown in the drawing.
  • the elements 12 are galvanically connected inside the enclosure 2 with the earthing terminal 6, which is not shown in the drawing.
  • a projection 13 which has the form of a truncated cone is located on the upper surface of the central element 2a of the enclosure 2.
  • An HV complete terminal 14 fitted with a threaded hole 15 is located in the projection 13.
  • the terminal 14 is galvanically connected inside the enclosure 2 with the beginning of the HV winding 16.
  • the end of the HV winding 16 is galvanically connected inside the enclosure 2 with an earthing terminal 6, which is not shown in the drawing.
  • the HV winding 16 is concentrically wound on an insulation tube 8 on a winding nn 7, the winding nn 7 and the HV winding 16 being separated by an insulation tape 17.
  • An HV bushing 18 is detachably fixed on the projection 13.
  • the HV bushing 18 is made as a resin cast fitted with circumferential sheds 19.
  • the connections 22, 23 have threads, not shown in the drawing.
  • the bushing 18 is fixed on the projection 13 by screwing the connection 22 located in the cavity 20 into the terminal 14.
  • the projection 13 fills the cavity 20, and the surface of contact between the external walls of the projection 13 and the surface of the cavity 20 is sealed with an insulating and sealing compound 24
  • the longitudinal axis of the bushing 18 coincides with the longitudinal axis of the projection 13 and it is situated in a plane parallel to the bottom surface 11 of the element 2d.
  • the sheds 25, 26 and 27 are situated parallel to one another and on planes parallel to the bottom surface 11 of the base 2b of the transformer 1, with a fixed inter-shed spacing S, angle of inclination of the sheds ⁇ and an alternating overhang P1, P2, with P1>P2 .
  • Sockets 28 for mounting brackets are located on the front and rear wall of the base 2b below the front surfaces of the element 2a screened by circumferential sheds 25.
  • the sockets 28 have the shape of semicircular longitudinal hollows.
  • the diameter of the sockets 28 is selected to correspond to the diameter of the tubes of the mounting bracket, not shown in the drawing.
  • the mounting bracket has a plate to which four arms in the form of tubes are attached.
  • the mounting bracket makes it possible to turn the transformer 1 in a plane perpendicular to the longitudinal axis of the sockets 28, in order to set the transformer up in such way that the projection 13 points downwards.
  • Such position of the transformer is necessary for a proper distribution of the sealing compound 24 when the connection 22 is screwed onto the terminal 14, so that the compound 24 does not overflow from the cavity 20 but is evenly distributed on the contact surface of the cavity 20 and of the projection 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Insulators (AREA)

Description

  • The invention deals with a MV single-pole voltage transformer in resin insulation. The voltage transformer is applicable in medium voltage measuring and protection electric power systems and as a power supply component in medium voltage switch-disconnector systems.
  • There is known a single-pole voltage transformer type TJO 7 manufactured by ABB Sp. z o.o. That transformer is tightly closed in an enclosure made as a resin cast comprising a central element integrated with a base and with adjacent side elements. The transformer enclosure is mounted on a plate. The central element has a projection in the shape of a truncated cone which is fitted with a complete high voltage terminal. A high voltage bushing is detachably attached to the projection. The complete high voltage terminal is galvanically connected with the beginning of the high voltage winding. The end of the high voltage winding is galvanically connected inside the enclosure with an earthing terminal located in a box attached to the base. That transformer has at least one secondary winding. The output lead of the secondary winding(s) is on the transformer cast and it is protected by a tight cover. Additionally, there are four handles located on the transformer base, which make the transport of the transformer easier.
  • In the above presented solution, the height of the bushing is sufficiently big to secure the required creepage distance. The creepage distance of the TJO 7 transformer is equal to the distance between the bushing terminal and the nearest earthed metallic part, i.e. the terminal box of the earthed plate attached to the base, measured along the surface of the bushing and the surface of the transformer enclosure. The creepage distance can be increased by using a longer bushing, which increases the bending moment at the place where the bushing is mechanically connected to the transformer body because of the longer arm of the loading force applied to the bushing terminal during its operation.
  • The essence of the invention having a single-pole voltage transformer tightly closed in an enclosure made as a resin cast comprising a central element integrated with a base and with adjacent side elements of the cast, wherein the central element has a projection in the shape of a truncated cone to which a high voltage bushing is detachably attached, is that the central element has the form of a circular cylinder situated with its side wall horizontally on the base plane, and the place of the contact of the central element with the base plane is screened by circumferential bottom sheds over which there are located side elements of the cast forming side sheds which are integrated with the front surfaces of the central element, and above the side sheds there is situated a circumferential top shed surrounding a fragment of the side surface of the central element.
  • Preferably the side walls of the base situated along the side walls of the central element are fitted with oblong sockets having the shape of semicircular longitudinal hollows.
  • Preferably the circumferential bottom sheds, the side sheds and the circumferential top shed are situated parallel to one another and on planes parallel to the surface of the base and they have a fixed inter-shed spacing and an alternately variable overhang between the adjacent sheds.
  • Preferably the high voltage busing has in its bottom part, the high voltage bushing has a centrally situated cavity in the shape of a truncated cone, which shape corresponds to the shape of the projection of the central element.
  • Preferably after the bushing has been mounted on the transformer, its longitudinal axis coincides with the longitudinal axis of the projection.
  • Preferably the surface of the contact between the projection and the cavity in the bushing is sealed with an insulating and sealing compound.
  • The advantage of the single-pole voltage transformer according to the invention is that it has longer creepage distance while maintaining the outside dimensions of the transformer, which eliminates the necessity to use longer bushings, minimizes the bending force in the place of the mechanical connection between the bushing and the transformer body, and eliminates the risk of damage to the transformer in the place of the mechanical connection between the bushing and the transformer body.
  • The advantage of the single-pole voltage transformer according to the invention is that the transformer enclosure is fitted with sockets used to fix the transformer in a mounting bracket by means of which the transformer can be turned and positioned in such way that the projection points downwards so that the sealing compound is evenly distributed on the contact surface of the cavity in the bushing and on the projection when a connection is screwed onto the transformer projection terminal.
  • An embodiment of the invention is shown in the drawing, where:
    • Fig. 1 -
    shows a front view of the transformer in isometric projection,
    Fig. 2 -
    shows the transformer after the terminal box has been removed, in a side view,
    Fig. 3 -
    shows the transformer from fig. 2, in section A-A,
    Fig. 4 -
    shows the transformer in a bottom view,
    Fig. 5 -
    shows the transformer bushing from fig. 2, in section A-A.
  • The single-pole voltage transformer 1 comprises a tight enclosure 2 made as a resin cast with a central element of the casing 2a and an enclosure base 2b and side elements of the base 2c.
  • The enclosure element 2a has the form of a circular cylinder situated horizontally on the base 2b. The base 2b has the form of a cuboid with rounded edges. A cuboidal side element 2d integrated with the base 2b adjoins the base, more specifically one of its side walls.
  • A terminal box 3 is attached to a side wall of the element 2d of the enclosure 2. Inside the box 3, in a side wall of the element 2d there are located two complete terminals nn 4, 5 and an earthing terminal 6. The terminals 4 and 5 are galvanically connected inside the enclosure 2 with a low voltage winding nn 7. The winding nn 7 is wound on an insulating tube 8 fixed on a core 9 secured in a yoke 10 located in the enclosure 2. The earthing terminal 6 is galvanically connected inside the enclosure 2 with the yoke 10 and the core 9.
  • On the bottom surface 11 of the element 2b of the enclosure 2 there are located assembly elements 12 in the form of threaded conducting inserts which are used to fix the transformer 1 to a support structure in the form of a plate or rails, not shown in the drawing. The elements 12 are galvanically connected inside the enclosure 2 with the earthing terminal 6, which is not shown in the drawing.
  • A projection 13 which has the form of a truncated cone is located on the upper surface of the central element 2a of the enclosure 2. An HV complete terminal 14 fitted with a threaded hole 15 is located in the projection 13. The terminal 14 is galvanically connected inside the enclosure 2 with the beginning of the HV winding 16. The end of the HV winding 16 is galvanically connected inside the enclosure 2 with an earthing terminal 6, which is not shown in the drawing. The HV winding 16 is concentrically wound on an insulation tube 8 on a winding nn 7, the winding nn 7 and the HV winding 16 being separated by an insulation tape 17.
  • An HV bushing 18 is detachably fixed on the projection 13. The HV bushing 18 is made as a resin cast fitted with circumferential sheds 19. In the base of the bushing 18, there is a cavity 20 having the shape of a truncated cone situated coaxially to the longitudinal axis of the bushing 18, after it has been mounted, and its shape corresponds to the shape of the projection 13. In the longitudinal axis of the bushing 18 there is located a conductive rod 21 whose ends protrude outside the resin cast of the bushing 18 and they form the first connection 22 and the second connection 23. The connections 22, 23 have threads, not shown in the drawing. The bushing 18 is fixed on the projection 13 by screwing the connection 22 located in the cavity 20 into the terminal 14. The projection 13 fills the cavity 20, and the surface of contact between the external walls of the projection 13 and the surface of the cavity 20 is sealed with an insulating and sealing compound 24
  • The longitudinal axis of the bushing 18 coincides with the longitudinal axis of the projection 13 and it is situated in a plane parallel to the bottom surface 11 of the element 2d.
  • The place of contact of the side surface of the element 2a with the base 2b is screened by circumferential bottom sheds 25. Above the sheds 25 there are situated, on both sides with respect to the front surfaces of the element 2a, side elements of the cast 2c forming semicircular side sheds 26 over which, in the upper part of the enclosure 2 below the projection 13, a circumferential upper shed 27 is situated.
  • The sheds 25, 26 and 27 are situated parallel to one another and on planes parallel to the bottom surface 11 of the base 2b of the transformer 1, with a fixed inter-shed spacing S, angle of inclination of the sheds α and an alternating overhang P1, P2, with P1>P2 .
  • Sockets 28 for mounting brackets, not shown in the drawing, are located on the front and rear wall of the base 2b below the front surfaces of the element 2a screened by circumferential sheds 25. The sockets 28 have the shape of semicircular longitudinal hollows. The diameter of the sockets 28 is selected to correspond to the diameter of the tubes of the mounting bracket, not shown in the drawing. The mounting bracket has a plate to which four arms in the form of tubes are attached. The mounting bracket makes it possible to turn the transformer 1 in a plane perpendicular to the longitudinal axis of the sockets 28, in order to set the transformer up in such way that the projection 13 points downwards. Such position of the transformer is necessary for a proper distribution of the sealing compound 24 when the connection 22 is screwed onto the terminal 14, so that the compound 24 does not overflow from the cavity 20 but is evenly distributed on the contact surface of the cavity 20 and of the projection 13.
    • Key to the drawing
    • 1 -
    the voltage transformer
    2 -
    the enclosure
    2a -
    the central element of the enclosure
    2b -
    the base of the enclosure
    2c -
    the side element of the enclosure
    2d -
    the side element of the base
    3 -
    the terminal box
    4, 5 -
    the complete terminals nn
    6 -
    the earthing terminal
    7 -
    the winding nn
    8 -
    the insulation tube
    9 -
    the core
    10 -
    the yoke
    11 -
    the bottom surface of the element 2b
    12 -
    the assembly elements
    13 -
    the projection
    14 -
    the complete HV terminal
    15 -
    the threaded hole
    16 -
    the HV winding
    17 -
    the insulating tape
    18 -
    the bushing
    19 -
    the sheds
    20 -
    the cavity
    21 -
    the conductive rod
    22 -
    the first connection
    23 -
    the second connection
    24 -
    the sealing compound
    25 -
    the circumferential bottom sheds
    26 -
    the side sheds
    27 -
    the circumferential upper shed
    28 -
    the sockets
    α -
    the angle of inclination of the sheds
    S -
    the inter-shed spacing
    P1, P2 -
    the overhang of the sheds

Claims (6)

  1. A single-pole voltage transformer enclosed in a tight enclosure made in the form of a resin cast comprising a central element integrated with a base and with side elements of the cast, wherein the central element has a projection in the shape of a truncated cone to which a high voltage bushing is detachably attached, the central element (2a) has the form of a circular cylinder situated with its side wall horizontally on the base plane (2b), and characterised in that the place of the contact of the central element (2a) with the base plane (2b) is screened by circumferential bottom sheds (25) over which there are located side elements of the cast (2c) forming side sheds (26) which are integrated with the front surfaces of the central element (2a), and above the side sheds (26) there is situated a circumferential top shed (27) surrounding a fragment of the side surface of the central element (2a).
  2. A transformer according to claim 1 characterised in that the side walls of the base (2b), situated along the side wall of the central element (2a), are fitted with oblong sockets (28) having the shape of semicircular longitudinal hollows.
  3. A transformer according to claim 1 characterised in that the circumferential bottom sheds (25), the side sheds (26), and the circumferential top shed (27) are situated parallel to one another and on planes parallel to the surface (11) of the base (2b) and they have a fixed inter-shed spacing (S) and an alternately variable overhang (P1, P2) between the adjacent sheds.
  4. A transformer according to claim 1, characterised in that high voltage bushing (18) has in its bottom part a centrally situated cavity (20) having the shape of a truncated cone which shape corresponds to the projection (13) of the central element (2a).
  5. A transformer according to claim 4, characterised in that the longitudinal axis of the bushing (18) coincides with the longitudinal axis of the projection (13) when the bushing has been mounted on the transformer (1).
  6. A transformer according to claim 5, characterised in that the surface of the contact between the projection (13) and the cavity (20) in the bushing (18) is sealed with an insulating and sealing compound (24).
EP16744576.6A 2015-08-10 2016-06-27 Single-pole voltage transformer Active EP3335230B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL124309U PL69612Y1 (en) 2015-08-10 2015-08-10 Unipolar voltage transformer
PCT/PL2016/000066 WO2017026906A1 (en) 2015-08-10 2016-06-27 Single-pole voltage transformer

Publications (2)

Publication Number Publication Date
EP3335230A1 EP3335230A1 (en) 2018-06-20
EP3335230B1 true EP3335230B1 (en) 2020-01-08

Family

ID=57979431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16744576.6A Active EP3335230B1 (en) 2015-08-10 2016-06-27 Single-pole voltage transformer

Country Status (3)

Country Link
EP (1) EP3335230B1 (en)
PL (1) PL69612Y1 (en)
WO (1) WO2017026906A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110706898B (en) * 2019-10-25 2020-10-27 中互电气(江苏)有限公司 Outdoor voltage transformer with anti-corrosion capability

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203118750U (en) * 2013-01-14 2013-08-07 深圳市第二互感器科技有限公司 Voltage transformer
CN204011020U (en) * 2014-08-12 2014-12-10 湖南大北互互感器有限公司 Outdoor single-phase compound inslation ground-type potential transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2017026906A1 (en) 2017-02-16
EP3335230A1 (en) 2018-06-20
PL124309U1 (en) 2017-02-13
PL69612Y1 (en) 2017-12-29

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