JPH06508714A - Disconnector with main switching contact and auxiliary contact - Google Patents

Abstract

An isolating switch is to be adapted to the heavy currents occurring during busbar changes at low operating voltages. To this end, an auxiliary contact pin (3), which is located in a counter-contact (2) in the known manner and acts as a preliminary contact, is fitted with an auxiliary sliding contact (11). The auxiliary contact pin (3) runs off this auxiliary sliding contact (11) after the counter-contact member has made contact. Thus the rated current is conducted solely along the main current track. (The auxiliary contact pin runs off the auxiliary sliding contact.)

Description

[Detailed description of the invention] The invention of the disconnector n: equipped with a main switching contact and an auxiliary contact is a main Comprising a switching contact and a counter contact arranged opposite to the first and second main switching contacts, This opposing contact piece is movable in the axial direction with the opposing contact piece, is biased by a spring, and The disconnector is provided with an auxiliary contact piece that comes into contact with the main switching contact piece before the opposing contact piece. Regarding road equipment.

Such a disconnector is described, for example, in German Patent Application No. 3938711 It is known from the official gazette. For the disconnectors listed there, the jump of the closing stroke is The main switching contact enters the counter contact, where it first slides into the auxiliary contact and then the auxiliary contact. A configuration such as contacting opposing contact strips of the contact structure allows capacitive current to be dissipated in the disconnector. chosen to suppress. The auxiliary contact forms the lead contact where the arc occurs. In this case, the contact surface of the main switching contact through which the rated current flows may melt or other damage may occur. The current to be conducted through the auxiliary contact is not damaged in the manner described. When small, a spring pushes the auxiliary contact axially toward the main switching contact. It is sufficient to make contact through the

However, such contact is generally insufficient for cases such as busbar replacement. It's a minute. When replacing a busbar, a large current is generated even though the voltage is relatively low. Ru. Therefore, the contact of the auxiliary contact, which also carries a larger current, is taken into account. Must be. Furthermore, in the case of opening and closing like this, 1! If the flow is parallel to the auxiliary contact When commutating current from the column lit flow path to the main flow path via the opposing contact, the voltage generated is Although the power is low but the power is high, there is a risk of melting the main switching contact. The invention therefore provides for the new circuit device mentioned at the beginning, when the drive voltage is Even when a large current is generated despite being low, the commutation to the main current path is the rated current contact. The goal is to create a structure that allows this to be carried out without damage.

According to the present invention, this problem can be solved by connecting the auxiliary contact piece to the main contact piece, which is conductively connected to the opposing contact piece. Equipped with an auxiliary sliding contact that contacts the opening/closing contact at the disconnection position and at the beginning of the closing stroke. , after the auxiliary contact makes contact with the main opening/closing contact and the opposing contact piece, this auxiliary sliding t1. I! This is solved by configuring it away from f.

The auxiliary sliding contact provides a reliable and also large contact between the auxiliary contact and the counter contact piece. Six auxiliary contacts provide a conductive connection that can handle even large currents. After the contact between the contact piece and the opposite contact piece, the disconnector is released by separating from the auxiliary sliding contact. Current is guaranteed to be conducted only through one and only defined current path in the incoming state. It will be done.

In an advantageous embodiment of the invention, the main switching contact and the auxiliary contact each have one another. The end face portion contacting the at least partially consists of a burnout-resistant material.

By configuring the end surfaces of both pupil tentacles in this way, it is possible to reduce the arc that occurs before contact is made. tS scratches on the leading contact surface caused by this can be avoided for a long time.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a schematic cross-sectional view of the state of the disconnector according to the present invention at the start of closing, and FIG. 2 is the same as that of FIG. Figure 3 is a schematic cross-sectional view of the state of the disconnector during the closing process, and Figure 3 shows the state of the disconnector in Figure 1 during the closing process. The state is shown in a schematic cross-sectional view.

In FIG. 1, the main switching contact 1 approaches the opposing contact 2, and the auxiliary contact 3 and its Already in contact at the end faces. The main opening/closing contact I and the auxiliary contact 3 are In order to avoid damage to the end faces due to arcing, each It is provided with a filling 4.5 of a erodible material.

The opposing contact 2 is shielded by a shield electrode 6. of shield electrode 6 A counter contact piece 7 carrying the rated current is arranged behind it.

If the auxiliary contactor 3 is guided by the screaming rod 8 so that it can move in the axial direction, It is biased in the axial direction by a spring 9. The spring 9 is connected to the rest of the structure by an insulating plate 10. Have been screaming for minutes. The auxiliary contact 3 is connected exclusively via the auxiliary sliding contact 11. It comes into contact with the outer wall surface. Auxiliary contact 3 is an auxiliary sliding contact! 311 and at least the opposite contact Contact piece 7): Contacts until it is in contact with the main opening/closing contact 1. opposing contact The child piece 7 is arranged so as to slide on the outer wall surface of the main opening/closing contact 1. auxiliary Since the contact 3 has a smaller diameter than the main opening/closing contact 1, the auxiliary contact 3 is an opposing contact. It does not touch piece 7.

When the main switching contact l moves further after contact with the opposing contact piece 7, the main switching contact 1 By pushing the auxiliary contact 3 against the force of the spring 9, the auxiliary contact 3 is released from the auxiliary sliding contact 11. Leave. After that, the current passing through the disconnector passes through the main switching contact 1 and the counter contact piece 7. Current flows through only one path.

Continuation of front page (72) Inventor Makalainis, Deirck Federal Republic of Germany Day-1000 Lulin 45 Siere Strasse 23 A (72) Inventor Purbust, Bu Treff Federal Republic of Germany Day-1000 Berlin 45 Lermoserveke 12

Claims (1)

[Claims] A main switching contact that can be driven in the axial direction and a pair placed opposite to this main switching contact. The opposing contact is provided with an opposing contact piece, and the opposing contact is movable in the axial direction and is supported by a spring. Therefore, the supplement is energized and comes into contact with the main switching contact temporally before the opposing contact piece. In a disconnector equipped with an auxiliary contact, it is conductively connected to the opposing contact piece (7) and disconnects. With an auxiliary sliding contact (11) that makes contact at the position and at the beginning of the closing stroke, the auxiliary contact The feeler (3) is an auxiliary sliding contact after the main opening/closing contact (1) contacts the opposing contact piece (7). (11) A disconnector characterized by being separated from. 2. The main opening/closing contact (1) and the auxiliary contact (3) are located on the end surfaces that contact each other. Claim 1, characterized in that the material is at least partially made of burnout-resistant material. Disconnector by.