Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
  • H01H31/003—Earthing switches
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/02—Details
  • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
  • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
  • H01H33/121—Load break switches
  • H01H33/125—Load break switches comprising a separate circuit breaker
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/02—Details
  • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
  • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
  • H01H33/121—Load break switches
  • H01H33/125—Load break switches comprising a separate circuit breaker
  • H01H33/127—Load break switches comprising a separate circuit breaker movable with a sectionalising contact arm and operated by such movement
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
  • H01H33/66—Vacuum switches
  • H01H33/666—Operating arrangements
  • H01H33/6661—Combination with other type of switch, e.g. for load break switches
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
  • H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric

Definitions

• the invention relates to a three-position circuit breaker for medium-voltage switchgear with a main contact system, formed from a first fixed contact and a second fixed contact, which are diametrically opposed, and a rotatable by means of a centrally between the first fixed contact and the second fixed contact rotary support movable contact forming a main current path in a first position of the moving contact, forming a separation distance in a second position of the rotatable moving contact and forming a grounding position with a grounding contact system in a third position of the rotatable moving contact, and a Crowstrompfad formed from the first fixed contact, the second fixed contact, a Löschtory- system and a first sliding contact and a second sliding contact for forming a conductive connection with the rotatable moving contact in a position between the first position and the second position chen turning angle range of the rotatable moving contact such that upon initiation of a rotary motion in the rotatable moving contact commutation tion of an
• a load-break switch for medium-voltage switchgear is known, for example, from DE 10 2004 006 476 A1 and comprises a main contact system and a shunt branch, in which shunt branch an extinguishing contact arrangement for extinguishing an arc and a disconnect contact arrangement for providing a dielectric strength are provided.
• a three-position circuit breaker of the type mentioned is known from EP 0693763 Bl. Object of the present invention is to form a three-position circuit breaker of the type mentioned, which is inexpensive to produce in a compact design.
• the means comprise a cam for actuating a rocker coupled to a moving contact connecting bolt of the vacuum interrupter by means of a guide element and the means further comprise a folding mechanism such that when the three-position load disconnecting switch is switched on, the third or second position of the rotatable movement contact in its first position the extinguishing contact system is interrupted.
• Such a three-position circuit breaker on the one hand has a compact design, because by the diametrical arrangement of the first fixed contact and second fixed contact to each other and the interposed rotatable moving contact an arrangement of main flow path and Maustrompfad in a small space next to each other is made possible by the rotational movement of a commutation over the Switching device guided alternating current from the main current path to the secondary current path is made possible.
• such a switching device has a cost-effective design, because by the arranged in the secondary current path extinguishing contact system both this and the first and second sliding contacts and other connecting means to the first and the second fixed contact of inexpensive material, such as steel or stainless steel or aluminum or the like , can be produced because a current is only briefly conducted during a switching operation via the secondary current path until, after arc quenching in the quenching contact system, a transfer to the disconnected position of the three-position circuit breaker is achieved. occurs, so that the requirements of the material properties of the secondary flow path are lower than the requirements for the material properties of the main flow path.
• the structure with a cam is mechanically simple and therefore compact and cost-effective, since only work against the low spring force of the contact pressure spring of the extinguishing contact system is to be done with this structure and by the folding mechanism is ensured in an advantageous manner that a switch-on of the switching device by initiating the rotational movement in the opposite direction and transfer of the rotatable moving contact from the third or the second position to the first position of the switching is carried out without electrical interference over the Maustrompfad and in particular without involvement of the vacuum interrupter of the extinguishing contact system, so that the vacuum interrupter no requirements regarding Einschaltfestmaschine or the like are made, because a Einschaltschreibfugeaubogen is ignited during the switching between the rotatable moving contact and the first and second fixed contacts, which is particularly in Anordnun g of the three-position circuit breaker in a filled with an insulating medium, such as an insulating gas or insulating liquid housing a simple, in contrast to the switching in the vacuum interrupter cost-effective way to perform
• the vacuum interrupter by means of a contact pressure spring
• the grounding contact system is formed by a ground contact, the second sliding contact as a ground counter contact and the rotatable movement contact.
• Figure 1 an embodiment of a switching device according to the invention in a first position
• FIGS 2 and 3 the switching device of Figure 1 in one
• FIG. 4 shows a view of an embodiment of a three-phase switching device according to the switching device of Figure 1.
• the first fixed contact 2 and the second fixed contact 3 which are preferably formed of copper as a material, together with a rotatable moving contact 4 form a main contact system and a main current path of the three-position circuit breaker 1.
• the moving contact 4 is designed as a pair of knives and comprises a first pair of knife ends 5 and a second pair of knife ends 6 and a figured not further shown conductive connection between the first pair of knife ends 5 and second pair of knife ends 6 and is located in the figure 1 in a first Position in which the first pair of knife ends 5 forms a conductive connection with the first fixed contact 2 and the second pair of knife ends 6 with the second fixed contact 3 forms a conductive connection, so that a current flow through the three-position circuit breaker 1 and over the main current path is possible.
• the rotatable moving contact 4 is fastened to a rotary support 7, in which rotary support 7 a drive movement of a drive likewise not shown in the figure for rotation of the rotary support 7, and thus rotation of the rotatable moving contact 4, is made possible.
• an extinguishing contact system 9 is electrically connected by means of a conductive connection 8, which extinguishing contact system 9 is formed by a vacuum interrupter 10 with moving contact 11 and fixed contact 12, wherein the extinguishing contact system 9 in the figure 1 is in the closed state by a contact pressure spring
• the moving contact 11 of the extinguishing contact system 9 is in turn conductively connected to a first sliding contact 15.
• a second sliding contact 16 is connected to the second by means of a further conductive connecting element 17 Fixed contact 3 electrically conductively connected, so that after initiating a rotational movement in the rotary support 7 and rotation of the rotatable moving contact 4 in a contact position in which the first knife pair end 5 and the second knife pair end 6 of the rotatable moving contact 4 m it is the first sliding contact 15 and the second sliding contact 16 in a conductive connection, a Crowstrompfad on the first fixed contact 2, the conductive connection 8, the closed Lösch.System 9, the first sliding contact 15, the rotatable moving contact 4, the second sliding contact 16, the conductive connecting element 17 and the second fixed contact 3 is formed, as explained in more detail below with reference to Figure 2.
• the first sliding contact 15 and the second sliding contact 16 may be formed of steel, for example.
• the cam track 19 in this case has a first portion 19 ', whose course is provided for opening the extinguishing contact system 9, and a second portion 19''with a maximum radius, is ensured by the holding open the extinguishing contact system via the guide pin 22.
• a grounding contact 24 of a grounding contact system is provided for forming a grounding position of the three-position load-break switch 1, which will be explained in more detail with reference to FIG.
• a folding mechanism 25 which has a rotary lever 26 and a spring lever 27 and also a spring 28, and which is provided so that when the three-position load-break switch 1 is switched on the extinguishing contact system 9 remains in its opened state, while the rotatable moving contact 4 is transferred from the grounding position or the switch-off position back into the first position by introducing an opposite rotational movement, in that the curved track 19 retains its maximum radius by the folding mechanism, as explained in more detail below in FIG.
• the three-position switch-disconnector 1 is included arranged in a housing 29 which can be filled with an insulating gas or an insulating liquid and by means of fastening elements, of which only one example is denoted by 30, can be fastened and mounted on the medium-voltage switchgear.
• the three-position load-break switch 1 of FIG. 1 is explained in more detail below with reference to FIGS. 1 to 3.
• the three-position circuit breaker 1 is in its first position with trained Hauptstrompfad over the first fixed contact 2, the rotatable moving contact 4 and the second fixed contact 3.
• the three-position circuit breaker 1 is in its first position with trained Hauptstrompfad over the first fixed contact 2, the rotatable moving contact 4 and the second fixed contact 3.
• Fixed contact 3 and the second sliding contact 16 is in electrically conductive connection, so that at this time a commutation of the main current path is introduced to the secondary flow path with the extinguishing contact system 9 closed.
• the first knife pair end 5 and the second knife pair end 6 are then only in conductive connection with the first sliding contact 15 and the second sliding contact 16, so that the main current path is interrupted and the commutation is completed.
• the cam plate 18 engages with its cam track 19 on the rocker 20, so that, by rotation of the rocker 20 about the pivot point 21 via the guide element 23 of the moving contact terminal pin 14 of the extinguishing contact system 9 is caused to move, which against the spring force the contact pressure spring 13 can be introduced and leads to the opening of the extinguishing contact system 9, so that an arc in the extinguishing contact system 9 of the vacuum interrupter 10 is ignited in the secondary flow path, which at a current zero crossing of the guided via the switching device Konstro- mes is deleted.
• a switch-on of the three-position circuit breaker 1 is done by initiating a rotational movement in the opposite direction to the rotational movement of the switching of the in the disconnected position or the grounding position three-position circuit breaker 1, as shown in Figure 3, and rotation of the rotatable moving contact 4 back to the position of Figure 1, to the first knife pair end 5 with the first fixed contact 2 and the second knife pair end 6 with the second fixed contact 3 comes into conductive connection.
• the folding mechanism 25 By means of the folding mechanism 25, it is ensured that the extinguishing contact system 9 remains in its opened state during the switch-on process because the spring 28 gives the maximum radius of the cam track for guiding the guide pin 22, as already described above.
• This makes it possible to cost-effectively carry out the vacuum interrupter 10 of the extinguishing contact system 9, since this is not involved in the switch-on and thus no special requirements for the switch-on of the vacuum interrupter 10 must be made.
• the arrangement of the secondary flow path can be formed by low-cost materials, such as steel, stainless steel or aluminum, because on the secondary flow path only briefly briefly briefly a current is conducted and in particular no short-circuit current occurs in the secondary flow path.
• FIG. 4 shows a three-phase switching device 1, each phase 31, 32 or 33 being designed according to the exemplary embodiment of FIGS. 1 to 6, of which the housings 29 can be seen, and the individual phases 31, 32 and 33 being connected to one another via connecting elements 34 are connected, so that a simultaneous actuation of all phases by initiating a rotational movement of a drive not shown in the figure is possible in the rotary support 7.
• the grounding contacts 24 of the phases 31, 32 and 33 are connected to each other via a ground bus 35, which in turn is earthed.
• a frame 36 is as a holder of the three-position load break switch 1 and for arranging busbar terminals 37, 38 and 39th and provided by cable outlet terminals 40, 41 and 42 of the switchgear.

Landscapes

• High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Arc-Extinguishing Devices That Are Switches (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48576428

Family Applications (1)

Country Status (4)

Cited By (11)

Families Citing this family (4)

Citations (4)

Family Cites Families (2)

• 2013
  • 2013-06-04 CN CN201380030088.5A patent/CN104335312B/zh active Active
  • 2013-06-04 ES ES13726788.6T patent/ES2601385T3/es active Active
  • 2013-06-04 WO PCT/EP2013/061437 patent/WO2014001029A1/fr not_active Ceased
  • 2013-06-04 EP EP13726788.6A patent/EP2845213B1/fr active Active

Patent Citations (5)

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