(19)
(11) EP 0 185 530 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.01.1988 Bulletin 1988/01

(43) Date of publication A2:
25.06.1986 Bulletin 1986/26

(21) Application number: 85309119

(22) Date of filing: 13.12.1985
(84) Designated Contracting States:
AT BE DE GB SE

(30) Priority: 13.12.1984 JP 26189584

(71) Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
 ()

(72) Inventor:
  • Yoshida, Kazuo Itami Works Mitsubishi Denki K.K.
     ()

   


(54) Three-phase on-load tap changer


(57) A three-phase on-load tap changer according to this invention is so constructed that change-over switches (D1-3) for three phases and tap selectors (S1-3) individually coresponding thereto are divided into at least two groups, that on-load tap changer units (LTC1, 2) which individually receive the groups are mechanically coupled to each other, and that a driver (3) which drives all the on-load tap changer units is coupled to a specified one of them. To be chosen as the specified on-load tap changer unit is the unit (1) in which, in the set of the change-over switch (D2) and the tap selector (S2) corresponding to a certain predetermined one of the three phases, only the change-over switch (D2) is separated and is received.






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