EP0177323A2 - Anordnung zur Lastumschaltung - Google Patents

Anordnung zur Lastumschaltung Download PDF

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Publication number
EP0177323A2
EP0177323A2 EP85306975A EP85306975A EP0177323A2 EP 0177323 A2 EP0177323 A2 EP 0177323A2 EP 85306975 A EP85306975 A EP 85306975A EP 85306975 A EP85306975 A EP 85306975A EP 0177323 A2 EP0177323 A2 EP 0177323A2
Authority
EP
European Patent Office
Prior art keywords
energization
tap
contact
resistor
current
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Withdrawn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
EP85306975A
Other languages
English (en)
French (fr)
Other versions
EP0177323A3 (de
Inventor
Kazuo C/0 Itami Works Yoshida
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0177323A2 publication Critical patent/EP0177323A2/de
Publication of EP0177323A3 publication Critical patent/EP0177323A3/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Withdrawn legal-status Critical Current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
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

Definitions

  • the present invention relates to an on-load tap changing device using a vacuum switch, and more particularly, to an improvement of the device for preventing a transformer from mortally damaging at shortcircuiting time between taps of the transformer.
  • Fig. 1 is a diagram of an electric circuit showing a conventional on-load tap changing device disclosed, for example, in Japanese Patent Laid-open No. 55-110,015 ofticial gazette.
  • reference numeral 1 designates a regulating winding of a transformer
  • numerals 2 and 3 designate tap selection branches of a tap selector for selecting odd and even taps on the winding 1
  • numeral 4 designates an input terminal of the even side of a changeover switch connected to the tap selection branch 2
  • numeral 5 designates an input terminal of the odd side of the changeover switch connected to the selection branch 3
  • numerals 6 and 7 designate energization stationary contact respectively connected to the input terminals 4 and 5
  • numeral 8 designate an energization movable contact selectively engaged with the stationary contacts 6 and 7
  • numeral 9 designates an output terminal of the changeover switch
  • reference characters VS1 and VS2 designate vacuum switches
  • character R designates a current limiting resistor.
  • Numeral 11 designates a fusible element made of a fuse or a fine conductor which can continuously flow normally the rated load current or its overload current of a transformer but is rapidly disconnected by a large current such as a shortcircuiting current between taps, and connected between the input terminal 5 and the stationary contact 7.
  • a shortcircuit detect between the taps will be described with reference to Figs. 1. If the vacuum switch VS1 fails to break a load current due to a certain cause when the vacuum switch VS1 is opened as shown in Fig. 1(b), a shortcircuit between the taps (a route designated by a broken line in Fig. l(c)) occurs through a space arc 10 at the stage of Fig. l(c), an excessive current flows as described above, the fuse is melted, and the shortcircuit defect between the taps is removed. When the defective current is removed, the load current il of the transformer is supplied through an electric circuit ot the branch 3, the input terminal 5, the resistor R, the switch VS1 and the output terminal 9 as shown in Fig.
  • the vacuum switch VS2 is first closed as shown in Fig. 2(b).
  • the load current il is supplied through an electric circuit shown by a solid line in Fig. 2(b) at this time, and the circulating current i between the taps is flowed through the electric circuit shown by a broken line in Fig. 2(b).
  • the vacuum switch VS1 is opened as shown in Fig. 2(c), tending to break the vector sum of the load current il and the circulating current i .
  • the conventional on-load tap changing device supplies the load current through the current limiting resistor if the fusible element is melted and disconnected due to the shortcircuit between t H e taps.
  • the conventional device has a drawback that if the time for switching the load to the other system becomes long, the thermal capacity of the resistor must be increased that much.
  • the present invention is made to eliminate the above- described problem and has for its object to provide an on-load tap changing device which can supply a load current without intermediary of a resistor even if a fusible element is melted and disconnected.
  • Fig. 3 is a circuit diagram showing an embodiment of the present invention.
  • reference numerals 1 to 9, 11, and reference characters VS1 and VS2 designate the same as those in Fig. 1.
  • Reference numeral 12 designates an energization exclusive stationary contact connected to the odd side input terminal 5;
  • numeral 13 designates an energization exclusive stationary contact connected to the odd side input terminal 4 of a changeover switch;
  • numeral 14 designates an energization exclusive movable contact constructed to be connected at one end to the output terminal 9 and selectively connected at the other end to the contacts 12 and 13.
  • Fig. 4 shows an operating sequence.
  • the state of the vacuum switch VS1 at the breakage failure time is entirely the same as those in Figs.
  • the input terminal 5, the contact 12, the contact 14 and the output terminal 9 is originally constructed to have the continuously energizing capacity, it does not disturb the supply of the load current if the tap changing operation is locked by employing the circuit arrangement of Fig. 1.
  • the fuse 11 is connected between the odd side input terminal 5 and the energization stationary contact 7 .
  • the present invention is not limited to the particular embodiment.
  • the fuse 11 may be connected between the odd side input terminal 4 and the energization stationary contact 6, or connected between both.
  • the load current is flowed to the energization exclusive contact by providing the energization exclusive contact in parallel with the circuit which includes the resistor. Therefore, the increase in the thermal capacity of the resistor can be advantageously prevented.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Protection Of Transformers (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
EP85306975A 1984-09-28 1985-09-30 Anordnung zur Lastumschaltung Withdrawn EP0177323A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP20500884A JPS6185016A (ja) 1984-09-28 1984-09-28 負荷時タツプ切換装置
JP205008/84 1984-09-28

Publications (2)

Publication Number Publication Date
EP0177323A2 true EP0177323A2 (de) 1986-04-09
EP0177323A3 EP0177323A3 (de) 1986-11-20

Family

ID=16499920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85306975A Withdrawn EP0177323A3 (de) 1984-09-28 1985-09-30 Anordnung zur Lastumschaltung

Country Status (2)

Country Link
EP (1) EP0177323A3 (de)
JP (1) JPS6185016A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6479369B2 (ja) * 2014-08-20 2019-03-06 株式会社ダイヘン 自動電圧調整装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2255830A1 (de) * 1972-11-15 1974-05-16 Transformatoren Union Ag Schaltungsanordnung zum unterbrechungslosen lastumschalten bei stufentransformatoren

Also Published As

Publication number Publication date
JPS6185016A (ja) 1986-04-30
EP0177323A3 (de) 1986-11-20

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Inventor name: YOSHIDA, KAZUOC/0 ITAMI WORKS