EP3711074B1 - Transportfähige leistungstransformatoreinheit - Google Patents

Transportfähige leistungstransformatoreinheit Download PDF

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Publication number
EP3711074B1
EP3711074B1 EP18702118.3A EP18702118A EP3711074B1 EP 3711074 B1 EP3711074 B1 EP 3711074B1 EP 18702118 A EP18702118 A EP 18702118A EP 3711074 B1 EP3711074 B1 EP 3711074B1
Authority
EP
European Patent Office
Prior art keywords
power transformer
tank
unit according
transformer unit
voltage
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
EP18702118.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3711074A1 (de
Inventor
Christian ETTL
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.)
Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP3711074A1 publication Critical patent/EP3711074A1/de
Application granted granted Critical
Publication of EP3711074B1 publication Critical patent/EP3711074B1/de
Active 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • 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
    • H01F27/002—Arrangements provided on the transformer facilitating its transport
    • 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
    • H01F27/025—Constructional details relating to cooling
    • 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
    • H01F27/24—Magnetic cores
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof

Definitions

  • the invention relates to a power transformer unit with at least one single-phase transformer, which is set up for connection to a high-voltage network, each single-phase transformer having a tank filled with an insulating fluid, in which a core with a high-voltage and low-voltage winding is arranged, at least one bushing socket, which is connected via a winding connection line that extends inside the tank is connected to the high-voltage or low-voltage winding, has at least one high-voltage bushing that can be inserted into the bushing socket, has a cooling device for cooling the insulating liquid, and an expansion tank that is used to compensate for temperature-related volume fluctuations in the insulating fluid.
  • Such a power transformer unit is from WO 2017/186748 A2 already known.
  • the power transformer unit shown there has three single-phase transformers, each intended for connection to a high-voltage network.
  • Each of the single-phase transformers has a separate tank, in which a core with a high-voltage and a low-voltage winding is arranged.
  • a bushing socket, into which a high-voltage bushing can be inserted, is fastened in a fluid-tight manner to a cover of the boiler.
  • the bushing protrudes into the oil chamber of the boiler and, with the help of an inner wall made of a non-conductive insulating material, holds a contact part that is connected to the high-voltage or low-voltage winding via a winding connection cable.
  • each leadthrough has an outdoor connection at its end facing away from the insertion side for connecting an air-insulated high-voltage line.
  • a cooling device that can be detachably connected to the boiler and an expansion vessel that can also be detachably connected to the boiler are also disclosed.
  • the detachable connection between the boiler on the one hand and the cooling device, expansion tank and high-voltage bushing on the other hand provides a modular structure that allows the single-phase transformer to be transported without a great deal of planning effort and put into operation quickly on site.
  • a power transformer unit with a modular design is also from WO 2017/186749 A1 , the WO 2017/186750 A2 and the WO 2017/186751 A1 famous.
  • the GB2464192A also describes a power transformer unit with at least one single-phase transformer, which is set up for connection to a high-voltage grid.
  • Each single-phase transformer has a tank filled with an insulating fluid, in which a core with a high-voltage and low-voltage winding is arranged. Furthermore, high-voltage bushings are provided.
  • a cooling device is used to cool the insulating liquid, with an expansion tank being connected to the boiler to compensate for temperature-related volume fluctuations in the insulating fluid.
  • the DE 749 246 discloses a rail-transportable single-phase transformer with two cores, which lie one behind the other in a longitudinal direction in a tank which is filled with an insulating fluid.
  • An expansion tank is permanently connected to the boiler.
  • DE 709 004 C (D3) describes a transformer set up for railway applications with horizontal bushings, preferably on the front side of the tank cover DE 918 695 , the DE 932 567 C and the DE 721 450 C described.
  • the object of the invention is to create a power transformer unit of the type mentioned at the outset that can be put into operation on site even more quickly.
  • the invention solves this problem in that the expansion tank and the cooling device are mechanically connected to the boiler and together with this and each bushing form a transport unit, the transport unit having an outer contour that lies within a predetermined transport profile.
  • a power transformer unit which consists of at least one and usually several single-phase transformers.
  • Each single-phase transformer is designed as a power transformer and is intended for connection to a high-voltage grid.
  • each single-phase transformer with the exception of the high-voltage bushings, form a transport unit whose outer contour lies within a prescribed transport profile.
  • a transport profile is given, for example, by traffic regulations to be observed during road transport, which stipulate the maximum height, width and length of a vehicle or a combination of vehicles.
  • the transport unit according to the invention lies within this transport profile and can therefore also be transported via conventional traffic routes without complex planning.
  • the only limiting factor is the weight of the transport unit, which can be between 50 and 200 tons.
  • the transport unit consists at least of the tank, the expansion tank and the cooling device of the respective single-phase transformer, the expansion tank and the cooling device being firmly connected to the tank.
  • Appropriate connecting lines allow insulating fluid can be circulated from inside the boiler via the cooling device or can get from the boiler into the expansion tank as a result of a temperature rise.
  • Appropriate lifting points are provided on the boiler, where a crane can intervene to lift the transport unit.
  • the transport unit is loaded, for example, onto the trailer of a truck or, alternatively, onto a rail vehicle or into an airplane.
  • the compactness of the transport unit ensures that it can be loaded onto the respective vehicle quickly and easily.
  • the transportation can be done quickly due to the limited planning requirements, so the entire power transformer unit can be quickly brought to the destination.
  • only the high-voltage bushings have to be plugged into the bushing sockets and connected to the respective lines of the high-voltage network. In this way, very quick commissioning can take place on site.
  • the boiler, cooling device and expansion tank are already filled with insulating fluid during transport.
  • the transport unit is less than 4.2 m in height, less than 3.3 m in width and less than 9 m in length to easily meet the requirements for goods to be transported in the respective countries.
  • the transport unit advantageously also comprises at least one motor drive, at least one sensor unit and at least one protection and monitoring device.
  • Said additional components are advantageously fixed to the boiler or else to the cooling device or attached to the expansion tank so that they form a solid mechanical bond and therefore do not have to be laboriously assembled on site.
  • the components are of course installed in such a way that the maximum height, width and length of the transport unit is within the transport profile.
  • the expansion tank is box-shaped, extends in a longitudinal direction and has a height of between 50 cm and 250 cm.
  • the expansion tank expediently extends above the boiler and parallel to it, the distance from the boiler being kept as small as possible and being, for example, a few centimeters, for example 5 cm - 30 cm. If the expansion vessel has a height of about 20 cm, for example, the boiler can have a height of more than 4 m without the transport unit projecting beyond the transport profile.
  • the width of the expansion tank is less than two thirds of the width of the boiler.
  • the length of the expansion vessel is greater than three quarters of the length of the boiler. According to this further development of the invention, it is ensured that the expansion vessel has the necessary internal volume in order to be able to compensate for the volume fluctuations of the insulating fluid even in the case of larger temperature fluctuations.
  • the boiler and expansion tank each extend in a longitudinal direction, with the two longitudinal directions running parallel to one another.
  • both the expansion vessel and the boiler are box-shaped.
  • the expansion tank box extends above the boiler with as little distance as possible.
  • the lengths of the boiler and expansion tank are advantageously of the same order of magnitude, while the width of the expansion tank is less than the width of the tank.
  • the expansion tank is therefore only arranged above a partial area of the lid of the boiler.
  • a section of the tank is open at the top in order to be able to arrange the high-voltage bushings there.
  • the boiler has two opposite long sides and two opposite end sides which are connected to the long sides and have a shorter width than the long sides, the cooling device being arranged on at least one of the end sides.
  • the boiler has a box-shaped outer contour that deviates from a cube structure in that two sides of the box that face each other are longer than the other two sides that face one another, the shorter sides being referred to herein as end faces.
  • the boiler can be designed in such a way that it has a width that is slightly smaller than that of the transport profile.
  • the length of the boiler is selected so that, together with the cooling devices arranged at the front, it does not exceed the maximum length of the transport profile. Arranging the cooling device on at least one of the end faces makes it possible in a particularly simple manner to dimension the transport unit in such a way that it does not exceed the transport profile.
  • the cooling device has two cooling units which are arranged on different end faces.
  • a cooling unit of the cooling device is arranged on a first end face.
  • the other cooling unit of the cooling device is on the opposite end of the boiler, with both cooling units being connected to the interior of the boiler via an inlet and outlet, so that the insulating fluid can be circulated through the respective cooling unit.
  • the circulation can take place passively or actively.
  • the cooling device has an inlet and outlet, both of which are arranged below a cooling unit of the cooling device. According to this advantageous further development, it is possible for the expansion tank to be arranged with only a small distance above the boiler.
  • the lead-through sockets are expediently arranged in a cover of the boiler. Domes that are usually provided on the boiler are avoided according to this advantageous further development. Although domes increase the internal volume of the boiler and therefore simplify the inclusion of a bushing. However, such a dome would not allow the expansion tank to be placed at a small distance from the cover of the boiler.
  • the windings expediently have an aramid insulation.
  • Aramid is an insulating material that belongs to a high thermal class and is able to provide the necessary dielectric strength even at high temperatures of the insulating fluid inside the boiler.
  • the aramid insulation is used, for example, to keep the winding conductors of the winding at a fixed distance from one another.
  • aramid insulation can also be used for voltage-proof routing of connecting cables.
  • an aramid insulation or another insulating material of this thermal class which can also be used instead of an aramid insulation, is known to the person skilled in the art, so that further explanations on this can be omitted.
  • the insulating fluid is an ester oil.
  • ester oils Compared to mineral oils, ester oils have the advantage that these are environmentally friendly.
  • transformers whose tanks are filled with ester oil can be operated at higher temperatures than would be the case with a comparable transformer filled with mineral oil.
  • the transport unit can therefore be made even more compact by selecting an ester oil as the insulating fluid.
  • figure 1 shows an embodiment of a single-phase transformer 1, a power transformer unit according to the invention, which in addition to the figure 1 shown single-phase transformer 1 has two more identically configured single-phase power transformers 1.
  • Each single-phase transformer 1 is used to connect one phase of a three-phase AC voltage supply network, which is here at a high-voltage potential of 335 kV.
  • the single-phase transformer 1 shown has a tank 2 which has a side wall 3 facing the viewer and an end face 4 which also faces the viewer.
  • the side wall 3 is a correspondingly dimensioned in figure 1 non-visible side wall 5 opposite, whereas the end face 4 is opposite a correspondingly dimensioned end face 6.
  • the boiler 2 has a cover 7 which closes it off in a fluid-tight manner at the top.
  • the bottom wall of boiler 2 is in figure 1 figuratively not shown.
  • the single-phase transformer 1 also includes a cooling device, which consists of two cooling units 8 and 9 , with the cooling unit 8 being firmly connected to the tank 2 on the front side 4 and the cooling unit 9 on the front side 6 .
  • Each cooling unit 8 or 9 is equipped with fans 10, which generate an air flow to increase the cooling capacity of the respective cooling unit 8, 9 if required.
  • Each cooling unit 8, 9 is connected via an inlet 11 and an outlet 12 to the interior of the boiler 2, which is filled with an insulating fluid—here an ester oil. It can be seen that both the inlet 11 and the outlet 12 flow into the respective cooling unit 8 or 9 below it.
  • An expansion tank 13 extends above the boiler 2 and is also connected to the interior of the boiler 2 via a connecting line 14 .
  • the expansion tank 13 extends in a longitudinal direction, the longitudinal direction of the expansion tank 13 and the longitudinal direction of the tank 2 running parallel to one another.
  • the expansion tank 13 is essentially box-shaped and in particular flat, and has a height of about 1 m, the distance between the cover 7 and the figure not shown bottom surface of the expansion vessel 13 is about 10 cm. It is essential that the inlet opening of the inlet 11 is arranged below the inlet outlet of the connecting line 14 so that it is ensured that the fill level of the insulating liquid in the boiler 2 is always above the inlet opening of the inlet 11 .
  • Feedthrough sockets 15 are arranged in the cover 7 and are connected to the boiler 2 in a fluid-tight manner.
  • each bushing 15 forms a fastening flange against which it is firmly pressed on the cover 7 of the boiler 2 .
  • Expedient screw connections are used for this purpose, for example.
  • sealing means shown in the figure are required, which are clamped between the cover 7 and the fastening flange.
  • Each feedthrough socket 15 also has a receiving section, which is not shown in the figure and consists of an electrically non-conductive insulating material. The receiving section tapers towards a closed end.
  • the wall of the receiving section is penetrated by a bolt-shaped electrically conductive contact part.
  • the contact part is connected to a winding connection line that extends inside the tank 2 to a winding that is arranged in the tank. Said winding is inductively coupled to a further winding via a magnetizable core.
  • each feedthrough socket 15 is in figure 1 each have a high-voltage bushing 16, 17, 18 introduced. These each have an insertion section on the insertion side, which is designed to be complementary in shape to said receiving section of the bushing 15, so that the two components fit together with a precise fit comes and air or other inclusions are avoided.
  • Each high-voltage bushing 16, 17, 18 is equipped with an outdoor connection 19 on its side facing away from said insertion section.
  • the single-phase transformer 1 has two cable outlets 20 that are set up to accommodate a cable plug.
  • the cable outlets 20 are redundant, so that if a cable outlet 20 fails, the power supply to the consumers connected downstream of the transformer 1 is ensured by the cable outlet 20 that is still intact.
  • FIG 1 the transformer 1 with three high-voltage bushings 16, 17 and 18 is shown.
  • the high-voltage bushing 16 is used to connect an air-insulated phase conductor of a high-voltage supply network with a voltage of 335 kV.
  • the single-phase transformer 1 can now be set in such a way that it emits the output voltage via the high-voltage bushing 17 or 18, the output voltage being 138 kV or 134 kV, for example. It goes without saying that in this case only one high-voltage bushing 17 or 18 is required on the output side and the other high-voltage bushing does not have to be plugged into the associated bushing socket 15 .
  • a device box 21 and a control unit 22 can be seen, which are fastened to the boiler 2 on both sides of the cooling unit 8.
  • a bulge 23 for receiving the bushing 15 for the high-voltage bushing 16 is used.
  • the cooling unit 9 can be seen offset laterally next to the bulge 23 .
  • FIG figure 2 shows the single-phase transformer 1 according to FIG figure 1 in a side view in which the bulge 23 somewhat covers the cooling unit 8 arranged behind it, so that only the fans 10 can be seen.
  • the expansion vessel 13 is offset to the left in relation to the boiler 2 and protrudes beyond the cover 7 of the boiler 2 and protrudes beyond the inlet 11 of the cooling unit 8, which extends from its inlet opening arranged at the top of the boiler 2 under the equipment box 21 to the inlet opening of the cooling unit 8 extends.
  • FIG 3 shows the single-phase transformer 1 in a top view, from which the connecting line 14 in particular can be clearly seen.
  • the expansion tank 13 has a ventilation line 24 which is equipped with an air drying system in order to enable the supply of dry air to the expansion tank 13 at its end remote from the expansion tank 13 .
  • FIG 4 shows a transport unit 25 of the single-phase transformer 1 according to FIG figures 1 , 2 or 3 , which includes all components of the single-phase transformer 1, with the exception of the high-voltage bushing 16, 17 and 18.
  • a transport profile 26 is illustrated, which is intended to clarify the maximum permissible size of goods to be transported in road traffic. It can be seen that the transport unit 25 does not protrude beyond the maximum permissible transport profile 26 . On the one hand, this is achieved in that all components—with the exception of the bushings 16, 17, 18—are installed on the end faces 4 or 6.
  • the expansion tank 13 is of flat design, with the accesses, ie both the input and the output, to the respective cooling units 8 and 9 being arranged below the respective cooling unit 8 and 9 .
  • figure 5 shows the transport unit 24 and the associated transport profile 25 in a front view. It can also be seen here that the transport unit 25 lies within the transport profile 26 and is therefore approved for road transport.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
EP18702118.3A 2018-01-15 2018-01-15 Transportfähige leistungstransformatoreinheit Active EP3711074B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/050859 WO2019137623A1 (de) 2018-01-15 2018-01-15 Transportfähige leistungstransformatoreinheit

Publications (2)

Publication Number Publication Date
EP3711074A1 EP3711074A1 (de) 2020-09-23
EP3711074B1 true EP3711074B1 (de) 2022-03-30

Family

ID=61094431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18702118.3A Active EP3711074B1 (de) 2018-01-15 2018-01-15 Transportfähige leistungstransformatoreinheit

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US (1) US20200343033A1 (da)
EP (1) EP3711074B1 (da)
DK (1) DK3711074T3 (da)
WO (1) WO2019137623A1 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112750607A (zh) 2019-10-31 2021-05-04 台达电子企业管理（上海）有限公司 变压器及具有其的功率模块
CN112821722B (zh) 2019-10-31 2022-07-19 台达电子企业管理（上海）有限公司 功率变换系统
CN112751473B (zh) * 2019-10-31 2021-11-05 台达电子企业管理（上海）有限公司 功率模块

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Also Published As

Publication number Publication date
WO2019137623A1 (de) 2019-07-18
US20200343033A1 (en) 2020-10-29
EP3711074A1 (de) 2020-09-23
DK3711074T3 (da) 2022-06-07

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