(19)
(11) EP 1 102 295 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.05.2003 Bulletin 2003/20

(43) Date of publication A2:
23.05.2001 Bulletin 2001/21

(21) Application number: 00123740.3

(22) Date of filing: 31.10.2000
(51) International Patent Classification (IPC)7: H01H 33/59
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 17.11.1999 JP 32643999

(71) Applicant: Hitachi, Ltd.
Chiyoda-ku, Tokyo 101-8010 (JP)

(72) Inventors:
  • Hosoda, Minoru
    Hitachi-shi, Ibaraki 316-0001 (JP)
  • Oouchi, Shigetoshi
    Hitachi-shi, Ibaraki 317-0076 (JP)
  • Yoshida, Tooru
    Hitachi-shi, Ibaraki 316-0036 (JP)
  • Matsuda, Yoshihiko
    Hitachi-shi, Ibaraki 316-0035 (JP)
  • Koga, Satoru
    Hitachi-shi, Ibaraki 316-0033 (JP)

(74) Representative: Strehl Schübel-Hopf & Partner 
Maximilianstrasse 54
80538 München
80538 München (DE)

   


(54) Commutation type direct-current breaker


(57) A commutation type direct-current breaker (5) according to the present invention comprises a first main switch (51) and a second main switch (52) inserted in series into a direct-current circuit that connects a direct-current power supply (1) with a load (2); a commutating circuit connected in parallel with the first main switch (51) which includes a first auxiliary switch (53) operating in interlocked relation with the first main switch (51), a second auxiliary switch (54) operating in interlocked relation with the second main switch (52), a first capacitor (55), a second capacitor (56), and a reactor (57); a control unit (50) for controlling opening and closing operations of the two main switches (51,52); and an overcurrent tripping device (59). According to the above configuration, it is possible to prevent hazards caused by capacitor charging voltage by disconnecting the circuit on the load side from two capacitors having different capacitance values when the breaker is opened. Also, it is possible to reduce the number of systems to be supplied with an instruction for switch opening or closing to two.






Search report