Classifications

• • 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
  • H01H33/6606—Terminal arrangements
• • 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
  • H01H33/6606—Terminal arrangements
  • H01H2033/6613—Cooling arrangements directly associated with the terminal arrangements
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/52—Cooling of switch parts

Definitions

• the invention relates to a fitting of a circuit breaker for connecting a fixed contact of a contact system of the circuit breaker with a busbar of a switchgear, which fitting a connection means of a first material with high electrical conductivity only for connection of the fixed contact with the busbar to form a current path and a thermally conductive on the Anschlußmit ⁇ tel arranged cooling body made of a second material having high thermal conductivity.
• the coupling device as a fitting is provided for connecting a fixed contact of a contact system of a circuit breaker with a busbar and comprises a connection means made of a material with high elec ⁇ cal conductivity for connecting the fixed contact with the busbar to form a current path and a heat sink of a material high thermal conductivity.
• the heat sink is arranged on the connecting means thermally conductive.
• Another fitting is known, for example, from EP 1 326 262 A1.
• the disclosed therein comprises a polar Matur pole ⁇ head as fitting, which is formed for joining a fixed contact of an interrupter unit as a contact system with a busbar of a switchgear.
• the pole head as a fitting is integrally formed of aluminum as an aluminum casting and has the functions power line to the contact system and cooling of the current path.
• Object of the present invention is to develop a valve of the type mentioned, which has a cost-effective construction on improved properties in terms of current carrying capacity and thermal conductivity.
• this object is achieved in a fitting of the type mentioned above in that the fitting comprises a connection means of a first material with high electrical conductivity only for connection of the fixed contact with the busbar to form a current path and a heat-conducting disposed on the connection means heat sink a second material having high thermal conductivity, wherein the heat sink surrounds the connection means in a form-fitting manner.
• the fitting of the circuit breaker he ⁇ inventively constructed of a connection means and a formschlüs ⁇ sig the connection means surrounding the heat sink which can advantageously be selected for both the connection means as well as for the heat sink different materials, so that in a simple manner the current carrying capacity of the valve and thus of the circuit breaker can be improved because a material with high electrical conductivity and thus lowest possible resistance can be selected for the connection means, whereas for the heat sink, a material with a good thermal conductivity, which is also inexpensive, is usable.
• the valve advantageously is loading réelle the current-carrying capacity and thermal conduction in simp ⁇ cher way to improve their properties and at the same time has a cost ⁇ cost structure.
• on the cooling body attachment means for securing the fitting on the power ⁇ switch as a result, a fastening of the valve is made possible on the circuit breaker in a simple manner.
• connection means on a first and a second leg having a first and a second pad for connecting the busbar and for connecting the fixed contact.
• connection means with a first and a second leg is designed approximately L-shaped, whereby advantageously a compact and inexpensive An ⁇ closing means is formed, because by the L-shaped Aus ⁇ design of the cost of materials for the connection means as possible can be held.
• connection means has recesses in such an arrangement that the heat sink produced by casting in the cured state, the connection means engages positively.
• recesses for example in the form of grooves and / or steps, a positive connection of the heat sink with the connection means is possible in a simple manner because the hardened after casting heat sink engages in the recesses and steps of the connection means and thus surrounds the connection means , so that an intimate connection between the heat sink and the connection means is formed.
• the invention further relates to a method for producing a fitting of a circuit breaker for connecting a fixed contact of a contact system of the circuit breaker with a busbar of a switchgear.
• Such a method is likewise known from EP 1 326 262 A1.
• the method disclosed therein comprises a single process step of casting the pole head and the pole carrier as a pole fitting.
• connection means (14) with a second Ma ⁇ material with high thermal conductivity under design of a cooling ribs (27, 29, 30) having heat sink (17).
• Such a method is particularly advantageous for Ausbil ⁇ tion or manufacture of a fitting, because it can be optimally configured with respect to its current carrying capacity by the separate formation of a connection means, the material requirement can be kept as low as possible.
• a material can be selected for the heat sink, which is inexpensive and has sufficient thermal conductivity.
• the overmolding of the connecting means with the second material also results in a form-locking surrounding of the connection means with the configured of the second material heat sink, because by different Materialausdehnungskoeffi ⁇ coefficients of the first and the second material, particularly forthcoming Trains t aluminum as the second material of the heat sink and copper as a first material supported form-locking surrounding of the connection means, because the currency ⁇ end of the casting process flowing aluminum with a small ⁇ ren material expansion coefficient stronger contracted in the recesses on cooling and which solidify as the copper, whereby a good fit between the cooling body and the (2004)mit ⁇ tel is generated.
• Such a positive environment of the connection means thus leads in a particularly advantageous manner to a good thermal conductivity between the connection means and the heat sink.
• the inventive method before the overmolding comprises heating the connection means to a Tempe ⁇ temperature which is less than the melting temperature of the first and the second material.
• a Tempe ⁇ temperature which is less than the melting temperature of the first and the second material.
• Figure 1 is a perspective view of a power switch ⁇ with valves according to the invention
• Figure 2 shows a switch pole of the circuit breaker of Figure 1 in a perspective view
• FIG. 3 shows a sectional view through an armature according to the invention
• Figure 4 is a perspective view of a heat sink of the valve according to the invention.
• Figure 5 is a perspective view of a connecting means of the valve according to the invention.
• FIG. 1 shows a circuit breaker 1 for use in a not illustrated figuratively switchgear for switching a wherein the power switch includes via conductor rails of the switchgear, the power scarf ⁇ ter 1 and further current rails of the switchgear run current, 1 switch poles 2, 3 4.
• the switch poles 2, 3, 4 are held with their insulating ⁇ material housings 5, 6, 7 on a support device 8 of the power switch 1.
• the switch poles 2, 3, 4 are with
• the switch poles 2, 3, 4 comprise contact systems with a fixed contact and a moving contact, wel ⁇ che are designed to switch the guided via the power switch current by means of a drive arranged in a space of the Ia-breaker 1 drive kinematics.
• FIG 2 shows a perspective view of the switch ⁇ pole 2, wherein the switch poles 3 and 4 of Figure 1 identical are constructed.
• the switch pole 2 with its insulating housing 5 comprises a pole head as a fitting 9 and a Polträ ⁇ ger 12, between which a vacuum interrupter 13 is arranged.
• the vacuum interrupter as a contact system 13 of the switch pole 2 comprises a moving contact, which is conductively connected to the pole carrier 12, and a fixed contact, which is conductively connected to the valve 9.
• the pole carrier 12 comprises a connection part for connection to a busbar of the switchgear.
• the valve 9 comprises a connecting means 14 having a first connecting surface 15, at which link ⁇ medium also provided 16 in the form of screw means for attachment to another busbar of the switchgear, so that the connecting means 14 only to Ver ⁇ tying the fixed contact of the contact system with the power rail of the switchgear is provided to form a current path.
• the fitting 9 furthermore has a heat sink 17, which surrounds the connection means 14 in a form-fitting manner and is connected in a heat-conducting manner to the connection means 14; the heat sink 17 therefore does not or not significantly contribute to the power line.
• FIG. 3 shows a sectional view through the fitting 9 according to the invention in FIG. 2.
• the connection means 14 comprises a first limb 18 with a first connection surface 19 and a second limb 20 with a second connection surface 21, the first connection surface 19 and the second connection surface 21 are aligned perpendicular to each other.
• This substantially L-shaped configuration of the connection means 14 results in a material-saving construction of the connection means 14.
• a first recess 23 is provided and at one end 24 of the second leg 20 are a step 25 and a second recess 26th educated.
• the heat sink 17 engages in the first recess 23 and the step 25 and the second recess 26 and a ⁇ gives the connection means 14 a positive fit.
• the heat sink 17 provides a perspective arrival, wherein the heat sink ver ⁇ adds 17 by fixing means 28 with which the fitting 9 is secured to the switch pole 2 of the Leis ⁇ tung switch.
• the heat sink 17 further comprises a plurality of cooling fins, wherein an outer contour of the heat sink 17 is formed by external cooling fins 29, and the heat sink also has internal cooling fins 30.
• the outer cooling ribs 29 and the inner cooling ribs 30 a large area is thus formed overall for heat exchange and for discharging the heat arising in the current path of the connection means 14.
• Figure 5 shows a perspective view of the means of Ranmit ⁇ 14 of the armature 9 according to the invention.
• connection means 14 is formed as a copper part in the embodiment according to FIG. 5 in a first production step, for example by milling.
• the connection means is then heated so that the surface is free of scale and sow ⁇ about to be cast around it in a next step in a mold with aluminum, wherein the form of embodiment of the heat sink 17 of Figure 4 corresponds.
• a form-fitting environment of the connection means 14 is thus produced by the heat sink 17, the form-fitting environment being assisted by the different coefficients of material expansion of aluminum as the material of the heat sink 17 and copper as the material of the connection means 14, because this into the first recess , the second recess and the step during the casting process flowing aluminum with a clotting ⁇ cal material expansion coefficient when cooling and He ⁇ rigid shrink more than the copper, creating a gu ter positive connection between the heat sink 17 and the connection means 14 is generated.

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Applications Claiming Priority (2)

Publications (1)

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ID=38508685

Family Applications (1)

Country Status (3)

Cited By (1)

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Citations (5)

Family Cites Families (2)

• 2006
  • 2006-08-29 DE DE200610041377 patent/DE102006041377B3/de active Active
• 2007
  • 2007-08-21 WO PCT/EP2007/058656 patent/WO2008025699A1/de active Application Filing
  • 2007-08-21 EP EP07788497A patent/EP2057656A1/de not_active Withdrawn

Patent Citations (5)

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