DD211668A1 - CIRCUIT PROTECTION SWITCH WITH A CONTACT ASSEMBLY CONSTRUCTING A BLOW LOOP - Google Patents

Abstract

The invention relates to a circuit breaker with a forming a Blasschleife contact arrangement, a magnetic Ausloeser and arranged in the region of the magnetic Ausloesers arc blast chamber. It is the object of the invention to provide, without additional expense, including the existing components and assemblies, an additional blown loop. According to the invention this is achieved in that the self-contained iron Rückschlussschlusskreis the magnetic Ausloesers separated on a leg and turned on as an additional Blasschleife in the Stromfuehrung.

Description

Circuit breaker with a blow loop forming contact arrangement

Field of application of the invention

The invention relates to a circuit breaker with a forming a blow loop contact arrangement, a magnetic release and arranged in the region of the magnetic release arc extinguishing chamber.

Characteristic of the known ... technical ^ solutions

In such circuit breakers formed by the fixed and the movable contact and the associated power supply conductor loop is used as Blasschleife to drive the resulting opening of the contacts switching arc to achieve a rapid movement of the arc away from the contact point in the arc quenching device «It is known In order to increase the influence of this blown loop by a further additionally arranged blown loop and thus to further improve the arc run as a whole. If an additional blown loop is provided in the immediate area of the contact point in conjunction with the special design of the current guide for firm contact (DE -OS 28 4-8 589) or «, to the movable contact (DE-OS 28 48 550), a good effect with respect to the rapid arc flow is achieved by the contacts, but for the movement of the arc in the arc quenching direction are these Anordnu not suitable

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Furthermore, arrangements of additional blow loops are known, which are arranged in the region of the arc runners (DE-AS 28 41 004), the contact ™ and pre-chamber include space (DE-AS 26 09 708) or the entire contact and extinguishing system of the switch enclose (DE -OS 28 30 648),

All these solutions is disadvantageous that additional parts cost, increased space requirements and increased installation costs are necessary for the realization of an additional Blasschleife.

It is the object of the invention to provide an additional blow loop without increased expense.

The invention makes it its mission, in a circuit breaker of the type mentioned by a suitable St rolling guide with the inclusion of existing components and assemblies to create an additional Blasschleife.

According to the invention this is achieved by -daß that the self-contained iron yoke of the magnetic circuit of the ifegnetauslösers is separated on a leg and is turned on in the power supply as additional Blasschleife.

This inventive design of the magnetic circuit as an additional blow loop is particularly advantageous because without additional resources and space required a uniform blower field over the entire, arranged in the region of the magnetic release contact and extinguishing system of the circuit breaker is achieved. Likewise, an effective premagnetization of the quenching plates of the arc quenching chamber, whereby they exert a higher force of attraction on the switching arc and overall an improvement of the turn-off is achieved.

By separating a leg of the iron yoke, there are no negative effects on the puncture of the magnetic trigger j because the magnetic circuit is symmetrical aiid the two legs represent a magnetic parallel circuit,

Reference to an embodiment of the invention will be explained in more detail. The drawing shows the magnetic release of a Leitungsscliutzschalters _s "consisting of coil 1, iron core 2, plunger 3 _S spring 4 ₉ insulating 5 and iron yoke 6 _O At the iron yoke 6 is the plunger contact 7, which together with the movable contact 8 forms the switching path attached When switched on, the plunger contact 7 and the movable contact 8 with their power supply lines form a U-shaped blowing loop, which drives the switching arc 9 during a short-circuit shut-off in the arc-extinguishing chamber 10, which is arranged in the region of the magnetic release.

According to the invention the iron yoke 6 of the magnetic release is separated on a leg 6b and included in the _{current-carrying?} in that the end of the Viagn et coil 1 is connected to the separating parts with the leg 6b of the iron yoke 6 and thus the current continues to flow through the leg 6a to Pestkontaktstück 7 _e thus forms the separated at a leg 6b iron yoke 6 an additional Blasschleife with one turn , The separation of the leg 6a has no negative effects on the puncture of the magnetic release, since the leg öa magnetically connected in parallel to the separation point 11 »

To the formed as an additional Blasschleife iron yoke forms a strong short-circuit shutdown

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magnetic field, whose field lines enforce the entire range of the contact and Lö sen system and pre-magnetize the sheets of the arc extinguishing chamber 10 in effect, whereby a total of a further improvement of the shutdown is achieved.

21. FER 1883 * 07040

Claims (1)

Erfindun ^ sanspruch Circuit breaker with a blow-loop, "forming
Contact arrangement, a magnetic release and arranged in the region of the magnetic release arc extinguishing chamber and with an additional acting on the arc blown loop, characterized in that the self-contained iron yoke 6 of the magnetic circuit of Mag ~ netauslösers separated on a leg 6b and in the power supply is turned on as an additional blow loop ». For this 1 ropes drawings- 21 FEB1883 * 0 7 0 4? ^: