JPS60107225A - Contactor unit of vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention is a contact device for a 7C nitrogen circuit breaker in which hollow contacts disposed facing each other on a coaxial line are biased.

The hollow cylindrical contact bases of both contacts are provided with slits that are inclined in the same direction with respect to the axis of the hollow contact, and each of the two contacts includes an insert made of a material with high electrical resistance.

[Prior art and its problems]

As is well known, the increase in arc voltage in a vacuum circuit breaker and the resulting power displacement can be prevented by applying a longitudinal magnetic field between separated contacts. For this purpose, so-called vertical magnetic field contacts are equipped with coils that are electrically connected in series with the switching contacts to generate a vertical magnetic field depending on the current, and this vertical magnetic field is generated between the opened and closed contacts. Penetrates the gap in the axial direction. This coil can be arranged both inside and outside the isolation chamber. In some cases, at least one of the current-carrying rods has a plurality of turns.
It can also be configured as The longitudinal magnetic field between the separated contacts prevents charged particles from diffusing out of the discharge region.

In one known example of such a longitudinal magnetic field contactor.

Disc-shaped hollow contacts are coaxially arranged opposite each other, and their hollow cylindrical contact bases are provided with slits that are inclined in the same direction with respect to the axis of the contacts. This slit can also be extended to a length that passes through the bottom of the contact. The contacts each include a generally disc-shaped contact, which can have a radial slit to suppress eddy currents. In order to increase the mechanical stability, it is possible to insert a support made of a material with high electrical resistance inside the hollow contact between the bottom of the contact and the top of the contact. After the contacts are separated, a longitudinal magnetic field is generated by the slits tilted in the same direction, and this magnetic field generates approximately 100 OA/cIT! Since contraction of the arc is prevented until reaching a relatively large current value corresponding to the current density of , a diffused arc is maintained until this limiting current value is reached (DE 32 27 482).

In one example of a hollow contact with slits inclined in opposite directions, a radial magnetic field is obtained which, after opening of the contacts, rotates an arc between the contacts with a circumferential force component. let It is known that the breaking capacity of a vacuum circuit breaker can be increased by superimposing a radial magnetic field on a vertical magnetic field. When both magnetic fields are superimposed in one contact device such that the longitudinal magnetic field component is more dominant than the radial magnetic field component.

The effects of both magnetic fields are exerted together. At relatively small current values, a diffused arc is obtained due to the dominant longitudinal magnetic field, whereas at high current values, on the other hand, the radial field component forces the arc to rotate.

In one known example of a contact device for a vacuum circuit breaker with so-called flat contacts, each contact contains an insert made of a highly conductive material, so that one of the contacts is energized. By forming the rod as a coil, a radial magnetic field is superimposed on the longitudinal magnetic field. In this case, due to the asymmetry in the air gap between the separated contacts, a radial field component is obtained in addition to the 111 field (DE 30 33 632).

It is further known that also in a contact device of a vacuum circuit breaker with pot-shaped contacts disposed opposite each other on a coaxial line, a longitudinal magnetic field can be superimposed on the radial magnetic field. The contact bases of both pot-shaped contacts are each equipped with a slit, and these slits have opposite directions in both contacts, so that they act as coils in which the interrupting current flows in opposite directions, but the number of turns is preferably less than 1. It can be done. The segments created between the slits provide a radial magnetic field after the contact is separated, the components of which cause the arc to rotate between the ring-shaped contact surfaces. In this device, a longitudinal magnetic field is obtained by providing a ring on both contacts that functions as a field winding and through which current flows in the same rotational direction. Therefore, the magnetic field acting between the contacts of this device is the magnetic field of the two coils in which current flows in the same direction on the - side contact, and
The contact on the other side is created by superimposing the magnetic fields of two coils with current flowing in opposite directions (West German Patent Publication No. 3151907).

[Purpose of the invention]

The object of the invention is to simplify and improve the known contact arrangement mentioned in the last part, in particular in order to reduce the electrical resistance and thereby increase the current carrying capacity accordingly. In the device, the partial magnetic fields of the coils disposed on one side of the intermediate plane between the contacts are mutually strengthened, while the partial magnetic fields of both coils disposed on the other side are directed in opposite directions. It is based on the knowledge that the effect of the irradiation is partially or completely weakened due to the orientation.

[Summary of the Invention] The purpose of this invention is to provide a contact device equipped with a hollow contact according to the above-mentioned method based on the present invention, in which the contact base of the side contactor is provided with a different number of sulins (.) in each contactor. Alternatively, this can be achieved by providing both contact blocks with slits having different inclination angles with respect to the axis of the contact.A vertical magnetic field and radius between the contacts that can withstand large contact pressure in the closed state of the vacuum circuit breaker and have low resistance and inductance. If a directional magnetic field is applied in combination, a contact device with correspondingly improved breaking capacity can be obtained.However, in the present invention, one side has a longitudinal magnetic field coil and a radial magnetic field coil.
arranging a coil having a number of l-n equal to the sum of the number of l-n;
By arranging on the other side a coil with a number of turns equal to the difference in the number of turns between the longitudinal magnetic field coil and the radial magnetic field coil, a simple With this method, a magnetic field similar to that of the conventional method can be obtained. In this device, the current flows radially from the current-carrying rod to the contact block, which has slits to generate a magnetic field, thereby minimizing the electrical resistance within the limits of the given diameter and height dimensions. be able to.

[Embodiments of the invention]

Next, the present invention will be described in detail with reference to the drawings.

In the example shown in the first FSIJ, two hollow contacts 2.4 whose central portions of their end faces form contact surfaces are arranged coaxially and facing each other. This hollow contact 2.4 is mainly comprised of the contact bottom 6.8. It consists of a hollow cylindrical contact base 10.12 and an approximately disc-shaped contact 14.16. It is reasonable to provide this contact with an unmarked oblique chamfer on its outer edge. The hollow contacts 2.4 each have a support 18.20 shown in broken lines in FIG.
Built-in. This support 18.20 consists of a material with a very high electrical resistance compared to copper, preferably a non-magnetic material, especially stainless steel. The bottom of the contact is the current carrying rod 22.24
is combined with

The contact bases 10.12 are each provided with a slit 26.28, the number of slits being different in the side contact pieces 2.4 in the illustrated embodiment.

The number of slits 26 in the upper contact 2 is significantly smaller than the number of slits 28 in the contact 4; this configuration of the slits 26 and 28 creates a magnetic field between the contacts 2 and 4, which is a superimposed radial field on the longitudinal field. is obtained. At moderate current values, where the average current density on the contact surface is up to about 100 OA/cll, the longitudinal component of the magnetic field acts so that the arc does not contract when the contacts are fully opened; however, the current Furthermore, when the arc contracts despite the large vertical magnetic field component, the radial component of the magnetic field acts.

The resulting contracted arc between the solid contacts rotates about the axis of the contact device. As a result, the thermal load on the contact surfaces is distributed over a larger area, so that the interrupting capacity can be extended to relatively large currents.

A similar effect can be obtained with the example of contactor 2.4 shown in FIG. In this contact, the contact base 10.degree. 12 is provided with slides (36, 38) having different selected inclinations relative to the unmarked axis of rotation of the contact. Slit 3 in the contact base 10 of the contactor 2
The inclination angle α of 6 is smaller than the inclination angle β of the slit 38 in the contact base 12 of the contact 4. The current directions in the segments respectively formed by two adjacent slits 36 or 38 are therefore different, and a radial magnetic field is superimposed on the longitudinal magnetic field between the separated contacts accordingly.

In order to limit eddy currents, the contacts 14.16 can each be provided with a radial slit, not labeled. It may likewise be expedient to suppress eddy currents in the contact base 6.8 by means of such radial slits, not shown.

〔Effect of the invention〕

When a vertical magnetic field and a radial magnetic field are applied to the gap between the open contacts in a vacuum circuit breaker contact device, when the current is relatively small, the arc does not contract and becomes stable, and the current When is large, the contracted arc rotates around the axis of the contact, preventing burnout of the contact surface. Conventionally, in order to realize such superposition of magnetic fields, a total of four coils were used for each contact, one coil for the vertical magnetic field with the same winding direction, and one coil for the radial magnetic field with the opposite winding direction. Formation was added. In this invention, the number of slits inclined in the same direction provided in each contact base of one contactor or the angle of inclination with respect to the axis are selected to be different in both contact bases. A coil formed by a slit with such a configuration.

The contact on one side has a number of turns equal to the sum of the number of turns of the longitudinal field coil and the radial field coil wound in the same direction, and the contact on the other side has a number of turns equal to the sum of the turns of the longitudinal field coil and the radial field coil wound in the same direction. The number of turns is equal to the difference in the number of turns between the longitudinal magnetic field coil and the radial magnetic field coil. Thereby, the same 8-field significance as in conventional contacts is achieved with a simple structure.

What is particularly important is that in such a configuration, current flows in the radial direction from the current-carrying rod to the contact base over the entire circumference, resulting in an extremely small one-stroke abrasion resistance and an effect of increasing the current-carrying capacity of the contact.

[Brief explanation of drawings]

FIG. 1 is an elevational view of Example 1 of a contactor device based on the present invention, and FIG. 2 is an elevational view of Example 2. In the drawing, 2.4 is a hollow contact, 10.12 is a contact base, 18.20 is an insert, and 26.28.3G. IGI IG 2

Claims (1)

[Claims] 1) A contact device for a vacuum 1 (2) disconnector equipped with two hollow contacts disposed oppositely on a coaxial line, wherein the hollow cylindrical contact base of both contacts is hollow. A contact base of one contact is provided in each contact with a slit inclined in the same direction relative to the axis of the contact, and both contacts each have an insert made of a material with high electrical resistance. A contact device for disconnecting a vacuum source characterized by having different numbers of slits. 2) A contact device for a vacuum circuit breaker equipped with two hollow contacts disposed oppositely on a coaxial line, in which the hollow cylindrical contact bases of both contacts have the same inclination with respect to the axis of the hollow contacts. In a device that is equipped with a slit inclined in the direction and in which both contact pieces each have a built-in insert made of a material with high electrical resistance, it is possible for both contact bases to turn on the slits that have different inclination angles with respect to the axis of the contact piece. Characteristic vacuum circuit breaker contact device.