EP3282458A1 - Überspannungsableiter für einen leistungstransformator - Google Patents

Überspannungsableiter für einen leistungstransformator Download PDF

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Publication number
EP3282458A1
EP3282458A1 EP16183298.5A EP16183298A EP3282458A1 EP 3282458 A1 EP3282458 A1 EP 3282458A1 EP 16183298 A EP16183298 A EP 16183298A EP 3282458 A1 EP3282458 A1 EP 3282458A1
Authority
EP
European Patent Office
Prior art keywords
winding
surge arrester
arrangement
transformer
surge
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.)
Withdrawn
Application number
EP16183298.5A
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English (en)
French (fr)
Inventor
Elisabeth Lindell
Lars Liljestrand
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
Original Assignee
ABB Schweiz 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
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP16183298.5A priority Critical patent/EP3282458A1/de
Priority to PCT/EP2017/066015 priority patent/WO2018028875A1/en
Publication of EP3282458A1 publication Critical patent/EP3282458A1/de
Withdrawn legal-status Critical Current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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/343—Preventing or reducing surge voltages; oscillations

Definitions

  • the present disclosure relates to a surge arrester arrangement for a phase leg winding of a transformer, as well as to a transformer arrangement comprising the surge arrester arrangement and the transformer.
  • transformers are designed to withstand certain electrical stresses.
  • surge arresters may be installed. These limit the voltage between their two connection points.
  • surge arresters are installed phase-to-ground and thus limit the corresponding voltage. They may also be installed phase-to-phase (in case of a Delta connected winding) or phase-to-neutral (in case of a Y-connected winding) and will then also limit the voltage across the winding. Still however, the internal resonance frequency of the winding may be excited and potentially contribute to significant stress.
  • US 4,604,673 discloses a two-part varistor element mounted inside an oil-filled tank of a transformer. The midpoint of the varistor element is connected to the midpoint of the high-voltage winding of the transformer.
  • EP 0 078 985 discloses a string of varistor elements located within the transformer tank and connected across each transformer winding to interior winding taps.
  • a protection which is based on surge arresters may limit the voltages phase-to-ground and phase-to-phase.
  • the improved protection in accordance with the present invention also limits the internal resonance of the transformer winding by means of connecting the surge arresters also to the middle, or other point, of the phase winding.
  • the surge arresters By the surge arresters being positioned outside of the transformer tank, they are e.g. not affected by hot transformer oil (or other insulation fluid) and are more easily accessible for maintenance etc.
  • a surge arrester arrangement for a phase leg winding of a transformer.
  • the surge arrester arrangement comprises a plurality of series connected surge arresters comprising at least a first surge arrester and a second surge arrester configured to be connected across the winding from a first end of the winding to a second end of the winding.
  • the arrangement also comprises an intermediate connection, between the first and second surge arresters and configured to connect to the winding such that a the first surge arrester is connected across a first section of the winding formed between the first end and the intermediate connection and the second surge arrester is connected across a second section of the winding formed between the second end and the intermediate connection.
  • the arrangement also comprises a plurality of bushings configured to allow connections to the series connected surge arresters to pass through a wall of a transformer tank containing the phase leg winding.
  • a transformer arrangement comprising the surge arrester arrangement of any preceding claim, and the transformer comprising the phase leg winding.
  • a benefit of the novel surge arrester arrangement which includes a connection point between at least two surge arresters connected in series with each other across (i.e. to and in parallel with) the transformer winding and the other connection point within the winding, e.g. at the midpoint of the winding, is that it limits the internal resonance of the winding.
  • a modification of the transformer is done in order to allow the surge arresters to be located outside of the transformer tank. This modification includes installing a plurality of bushings which enable access to the windings, e.g. to the terminals of the transformer as well as to the midpoint or other point(s) within the windings, from outside the tank.
  • three bushings may be installed in addition to the three bushings for the terminals, for a total of six bushings.
  • a further additional bushing may be installed to also enable access to the neutral point from outside the tank, for a total of seven bushings.
  • the surge arrester arrangement may be installed to liquid filled transformers, e.g. distribution or high-voltage transformers (or any transformers enclosed in a tank), but remain outside of the tank.
  • the transformer 1 comprises three phase legs, each comprising a winding 2 having a first end 2a and a second end 2b. Across each phase leg winding 2, a respective series of surge arresters 3, here surge arresters 3a and 3b, are connected.
  • the series of surge arresters is connected to the winding 2 at its first end 2a (by means of the first connection 4a) and its second end 2b (by means of the third connection 4c) such that at least a first surge arrester 3a and a second surge arrester 3b are connected in parallel with the winding 2.
  • any number of at least two surge arresters 3 may be connected in series in parallel with the winding 2.
  • first and second surge arrestors 3a and 3b there is an intermediate connection from between the first and second surge arrestors 3a and 3b to a point within the winding 2 e.g. to a winding tap of the winding.
  • the connection within the winding 2 may be at the middle of the winding, to form two equally large sections (first and second sections) of the winding.
  • the connection within the winding 2 may be such that the first and second winding sections are of different sizes.
  • the first surge arrester 3a is connected across (to and in parallel with) the first section of the winding 2
  • the second surge arrester 3b is connected across (to and in parallel with) the second section of the winding, for each phase leg winding respectively.
  • each phase leg winding 2 is sectioned into two sections, each with a corresponding surge arrester 3 connected across it.
  • each one of the phase leg windings 2 may be sectioned into any number of at least two sections by means of additional intermediate connections (not shown), where each section has a corresponding surge arrester of the series of surge arresters connected across it.
  • the plurality of series connected surge arresters may comprise a third surge arrester 3c which is connected between the winding and ground, as shown in the figures 1 and 2 .
  • the embodiments of the surge arrester arrangement shown in figures 1 and 2 thus each comprises nine surge arresters, three per phase of which two are connected in series with each other and in parallel with the winding 2 of the phase leg and one is connected between said winding 2 and ground.
  • the surge arrester 3c connected between the winding and ground is typically connected between the terminal end (i.e. the second end 2b) of the winding and ground, but it is also conceivable to in some embodiments connect a surge arrester between the neutral point (i.e. the first end 2a) of the winding and ground.
  • Each surge arrester 3 may comprise one or several varistor(s).
  • Figure 3 schematically illustrates an embodiment of a transformer arrangement comprising a surge arrester arrangement connected to a transformer 1 in a transformer tank 5 via connections 4 in bushings 6 through a wall of the tank 5.
  • surge arresters 3 for only one phase leg winding 2 are shown.
  • a corresponding set-up may be used for any number of phase leg windings 2, with corresponding connections 4 in additional bushings 6, or possibly via the same bushings shown in the figure for the one phase leg winding.
  • a first surge arrester 3a is connected across a first section of the winding 2 by means of a first connection 4a connected to the first end 2a of the winding and the intermediate connection 4b connected to (e.g. a tap) within the winding 2 e.g. at a midpoint thereof.
  • a second surge arrester 3b connected in series with the first surge arrester 3a, is connected across a second section of the winding 2 by means of a third connection 4c connected to the second end 2b of the winding and the intermediate connection 4b connected to (e.g. a tap) within the winding 2 e.g. at a midpoint thereof.
  • the first connection 4a passes through the wall of the tank 5 by means of a first bushing 6a
  • the intermediate connection 4b passes through the wall of the tank 5 by means of a second bushing 6b
  • the third connection 4c passes through the wall of the tank 5 by means of a third bushing 6c.
  • other bushing arrangements are also possible, in which a plurality of bushings through a wall of the tank 5 allows the surge arrester arrangement located outside of the tank to connect to a winding 2 of the transformer inside the tank.
  • a third surge arrester 3c may also be used, connected between the third connection 4c and ground, thus being connected between the phase leg winding 2 and ground.
  • the transformer tank 5 is typically filled with an electrically insulating fluid, e.g. a gas or a liquid such as an oil or ester-based liquid.
  • an electrically insulating fluid e.g. a gas or a liquid such as an oil or ester-based liquid.
  • the transformer may be better insulated, and also cooled, by means of the insulation fluid, allowing higher voltages than if the transformer was dry, in air, together with the surge arrester arrangement.
  • the plurality of bushings comprises a first bushing 6a for a first connection 4a between the first end 2a of the winding and the first surge arrester 3a, a second bushing 6b for the intermediate connection 4b, and a third bushing 6c for a third connection 4c between the second end 2b of the winding and the second surge arrester 3b.
  • the surge arrester arrangement comprises a third surge arrester (3c) connected between the phase leg winding (2) and ground.
  • the transformer 1 is a fluid-filled transformer wherein the tank 5 is filled with an electrically insulating fluid, e.g. a liquid such as an oil or ester-based liquid.
  • an electrically insulating fluid e.g. a liquid such as an oil or ester-based liquid.
  • the transformer comprises windings 2 of a plurality of phase legs, e.g. of a three-phase system, each connected to the surge arrester arrangement.
  • the phase leg windings 2 are connected in delta configuration.
  • six bushings 6 may be needed, one for each intermediate connection 4b, and one for each terminal wherein a bushing for a first connection 4a of one phase leg winding 2 is also for a third connection 4c of an adjacent phase leg winding 2 of the three-phase transformer 1.
  • the phase leg windings 2 are connected in wye configuration.
  • the first connection 4a of each phase leg winding 2 are interconnected, forming a neutral point of the transformer.
  • the neutral point in the wye configuration may be accommodated in the same first bushing 6a,.
  • a total of seven bushings 6 may be needed for a three-phase wye-configuration; one for the neutral point (the first bushing 6a), three for the terminals (one third bushing 6c for a third connection 4c of each phase leg winding 2), and one second bushing 6b for the intermediate connection 4b of each phase leg winding.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP16183298.5A 2016-08-09 2016-08-09 Überspannungsableiter für einen leistungstransformator Withdrawn EP3282458A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16183298.5A EP3282458A1 (de) 2016-08-09 2016-08-09 Überspannungsableiter für einen leistungstransformator
PCT/EP2017/066015 WO2018028875A1 (en) 2016-08-09 2017-06-28 Surge arresters for power transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16183298.5A EP3282458A1 (de) 2016-08-09 2016-08-09 Überspannungsableiter für einen leistungstransformator

Publications (1)

Publication Number Publication Date
EP3282458A1 true EP3282458A1 (de) 2018-02-14

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Family Applications (1)

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EP16183298.5A Withdrawn EP3282458A1 (de) 2016-08-09 2016-08-09 Überspannungsableiter für einen leistungstransformator

Country Status (2)

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EP (1) EP3282458A1 (de)
WO (1) WO2018028875A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3933862A1 (de) 2020-07-01 2022-01-05 ABB Power Grids Switzerland AG Transformatoranordnung und verfahren zur elektrischen verbindung und trennung eines transformators
EP3747100B1 (de) * 2018-01-30 2022-03-16 Hitachi Energy Switzerland AG Dimensionierung eines überspannungsschutzes in einem gleichstromübertragungssystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078985A1 (de) 1981-11-09 1983-05-18 General Electric Company Spannungsverteilung über der Wicklung und Schutz von Leistungstransformatorwicklung gegen transiente Spannungen
US4604673A (en) 1984-05-14 1986-08-05 General Electric Company Distribution transformer with surge protection device
JPS61190910A (ja) * 1985-02-20 1986-08-25 Hitachi Ltd ガス絶縁柱上変圧器
US4975797A (en) * 1989-08-16 1990-12-04 Cooper Industries, Inc. Arrester with external isolator
US20160149396A1 (en) * 2014-11-21 2016-05-26 Abb Ab System For Protection Of Dry Type Transformers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078985A1 (de) 1981-11-09 1983-05-18 General Electric Company Spannungsverteilung über der Wicklung und Schutz von Leistungstransformatorwicklung gegen transiente Spannungen
US4604673A (en) 1984-05-14 1986-08-05 General Electric Company Distribution transformer with surge protection device
JPS61190910A (ja) * 1985-02-20 1986-08-25 Hitachi Ltd ガス絶縁柱上変圧器
US4975797A (en) * 1989-08-16 1990-12-04 Cooper Industries, Inc. Arrester with external isolator
US20160149396A1 (en) * 2014-11-21 2016-05-26 Abb Ab System For Protection Of Dry Type Transformers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
E. LINDELL; L. LILJESTRAND: "Efficiency of surge arresters as protective devices against circuit breaker induced overvoltages", EFFECT OF DIFFERENT TYPES OF OVER VOLTAGE PRODUCTIVE DEVICES AGAINST VACUUM CIRCUIT BREAKER INDUCED TRANSIENTS IN CABLE SYSTEMS

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3747100B1 (de) * 2018-01-30 2022-03-16 Hitachi Energy Switzerland AG Dimensionierung eines überspannungsschutzes in einem gleichstromübertragungssystem
EP3933862A1 (de) 2020-07-01 2022-01-05 ABB Power Grids Switzerland AG Transformatoranordnung und verfahren zur elektrischen verbindung und trennung eines transformators
WO2022002513A2 (en) 2020-07-01 2022-01-06 Hitachi Energy Switzerland Ag Transformer arrangement and method for electrically connecting and disconnecting a transformer
WO2022002513A3 (en) * 2020-07-01 2022-02-10 Hitachi Energy Switzerland Ag Transformer arrangement and method for electrically connecting and disconnecting a transformer

Also Published As

Publication number Publication date
WO2018028875A1 (en) 2018-02-15

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