CN1164748A - Earthed switch for medium voltage switch equipment - Google Patents

Abstract

An earthing switch for medium-voltage switchgear with busbar magnetic fields, in particular for circuit-breaker plug-in devices, with or without easy switching, in which the earthing shaft is rotatably supported in the region of the free end and is optionally equipped at one end There are manual devices or motor power devices, and the grounding switch has first and second angle steel supports (WT1, WT2) at both ends of the earth wire shaft (EW), in which the first angle steel support is connected with the drive shaft sleeve (AH), and the second angle steel The bearing is connected with the free-running bushing (FH). Such earthing switches or earthing feed-through load switches are equipped in switchgear in medium-voltage technology.

Description

Earthing switch for medium voltage switchgear

The invention relates to an earthing switch with or without switching capacity for medium-voltage switchgears with a busbar field (Sammelschienenfeldern), in particular for circuit breaker plug-in devices, in which the earthing shaft is rotatably mounted on a free end area and optionally equipped with manual or motor power at one end.

Such earthing switches are combined in known switching devices in connection with so-called disconnectors. As described in the technical book: "Electrical Assembly Technology" from Siemens AG, Part 1, G. Seip, page 139, circuit breakers are often designed as so-called tumblers, in which the movable contact is mounted rotatably on a support part. In addition, a grounding switch or a grounding through-load switch with switching capacity is additionally mounted on the carrier part of the disconnector, so that the operating state occurring in medium-voltage technology - grounding or removal of the disconnector - can be controlled. Not only the movable contacts in the circuit-breaker, but also the movable earthing switch contacts and the contacts of the earthing through-load switch are connected to their own drive shafts, where manual, motor-powered or compressed air-powered devices are introduced As a power mechanism for circuit breaker and earthing switch or earthing thru load switch. In any case, the earthing switch must be adapted to the design of the circuit breaker, so that different earthing switches with corresponding drive units can be provided for different types of circuit breakers.

The object of the present invention is to specify an earthing switch which is largely independent of the type of disconnector and which forms an independent structural unit regardless of its power unit.

The object of the invention is achieved by using a grounding switch with or without switching capacity for medium voltage switchgear with busbar magnetic fields, in particular for circuit breaker plug-in devices, in which medium voltage switchgear The grounding shaft is rotatably supported in the free end area, and one end is selectively equipped with a manual device or a motor power device. It is characterized in that: the grounding switch has a first angle steel support and a second angle steel support at the free end of the grounding shaft; the grounding shaft is in the The position supported by the first angle steel is tightly connected with the transmission shaft sleeve; the ground shaft has an idler shaft sleeve connected with it by force transmission at the position supported by the second angle steel.

With such a design, the earthing switch can be combined in a very simple manner with different disconnecting switches. For this reason, two angle steel supports provide a reliable support to the ground shaft simultaneously. According to the invention, a free end is fastened to the drive shaft sleeve, and an idler shaft sleeve is arranged on the other free end. In this case, the gear bushing acts as a connecting so-called step gear, with which, for example, a grounded through load switch can also ground or short-circuit the corresponding contacts in the presence of voltage. The idling shaft sleeve located on the other side of the grounding shaft bears the transmission of the grounding switch or the grounding through-load switch itself.

According to an advantageous improvement of the present invention, it is characterized in that:

2.1 The force transmission between the freewheeling bushing and the ground shaft is achieved by means of an insert in the freewheeling bushing such that the drive of the grounding shaft via the freewheeling bushing takes place directly without time delay.

The earthing switch is therefore equipped with an insert part which connects the freewheeling bushing and the earthing shaft to one another in a force-transmitting manner without freewheeling. The operating sequence of the earthing switch is correspondingly and continuously controlled by the earthing bobbin drive.

According to other advantageous developments of the invention, it is characterized by:

3.1 The force transmission between the freewheeling bushing and the ground shaft is achieved by means of a key in the freewheeling bushing such that the drive of the grounding shaft via the freewheeling bushing takes place directly with a time delay.

Therefore, unlike the embedded part of the grounding switch, the grounding through load switch is equipped with a key, whereby the actuation of the grounding shaft can be carried out with a time delay.

The free-running bushing itself is designed as a unified component for both an earthing switch and an earthing thru-load switch.

The present invention is further described the present invention by means of embodiment shown in 4 accompanying drawings, in the accompanying drawings:

Fig. 1 is the front view of grounding switch of the present invention;

Fig. 2 is a top view of the grounding switch shown in Fig. 1;

3 and 4 are enlarged cross-sectional views along the A-B cross-section in FIG. 2 of the idling sleeve of the grounding switch or the grounding direct load switch shown in FIG. 2 .

As shown in Figure 1, the earthing switch ES is mainly composed of two angle steel supports WT1, WT2 and an earth wire shaft EW placed between them. Contacts KS are arranged on the ground shaft EW, which are firmly connected to the ground shaft EW. The first and second steel angle supports WT1, WT2 are connected rigidly enough by means of the support plate SB. For better clarity, the drive bush and the idler bush are not shown in the earthing switch ES.

Figure 2 shows the top view of the grounding switch or grounding direct load switch. It can be seen that: at the part where the first angle steel supports WT1, the ground wire shaft is connected to the drive shaft sleeve AH, and at the part where the second angle steel supports WT2, the ground wire shaft is connected to the drive shaft sleeve AH. The idle shaft sleeve FH is connected. Furthermore, it can be seen from FIG. 2 that this grounding switch is associated with a grounding feed-through load switch, which has a stepped transmission spring SF (Sprungantriebsfeder) between the power bushing AH and the contact KS rigidly coupled to the drive shaft. The free-running bushing FH opposite to the drive bushing AH is shown in section in FIGS. 3 and 4, from which its function can be clearly understood.

FIG. 3 shows a free-running bushing FH which is force-transmittingly coupled to the grounding shaft EW via an insert part ET and which can drive the grounding shaft without time delay.

FIG. 4 shows the free-running bushing FH, which is likewise described in section, but which is coupled to the ground shaft EW via the key PF. The rotation of the ground shaft is only transmitted to the free-running hub FH when the key hits the boundary of the not shown gap, so that this movement is transmitted with a time delay.

Claims (3)

1. An earthing switch with or without switching capacity for medium-voltage switchgear with busbar magnetic fields, in particular for circuit-breaker plug-in devices, in which the earth conductor shaft is rotatably supported in the region of the free end , and one end is selectively equipped with a manual device or a motor power device, characterized in that: the grounding switch has a first angle steel support (WT1) and a second angle steel support (WT2) at the free end of the ground wire shaft (EW); the ground wire shaft ( EW) is firmly connected with the drive shaft sleeve (AH) at the position of the first angle steel support (WT1); the ground shaft (EW) has an idle shaft sleeve (FH) connected with it by force transmission at the position of the second angle steel support (WT2) ). 2. The earthing switch according to claim 1, characterized in that: The force transmission between the free-running hub (FH) and the earth shaft (EW) is achieved by means of such an embedded part (ET) in the free-running hub (FH) that the drive of the earth shaft (EW) This is done directly and without time delay via the free-running hub (FH). 3. The earthing switch according to claim 1, characterized in that: The force transmission between the free-running hub (FH) and the earth shaft (EW) is achieved by means of such a key (PF) in the free-running hub (FH) that the drive of the earth shaft (EW) passes through The free-running hub (FH) is implemented directly with a time delay.

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