EP1569254A1 - Switch with earthing and/or disconnecting function - Google Patents

Abstract

The device has an isolation gas-filled encapsulation housing (1), an earthing contact (14), an isolator contact (15) attached to a first current conductor (6) at high voltage, a movable contact element (9), a conductor tube (11) attached to a second conductor (5) at high voltage coaxially enclosing the movable component and a drive (13) fed through the housing and applying force to the movable contact element. The drive has a mounting body (12) that is movable along the axis and radially guided in the conductor tube.

Description

TECHNICAL AREA

In the invention, it is assumed that a switching device according to the preamble of claim 1. Such a switching device can perform both separation and grounding functions and is used in gas-insulated, single or multi-phase encapsulated switchgear for voltages of several kV up to several hundred kV. This exploits the fact that the functions of disconnecting and grounding are often required at the same place in the switchgear. The switching device has an encapsulating housing filled with an insulating gas, for example nitrogen, air, sulfur hexafluoride (SF ₆ ), alone or in a mixture, of up to a few bar pressure, to which a grounding contact is fastened in the interior. Also arranged inside the housing are a disconnector contact fastened to a conductor and a movable contact element displaceable along an axis and movable into or out of engagement with either the disconnector or the earthing contact. In addition, a conductor conductor electrically conductively attached to a further current conductor is provided in the housing, which comprises the movable contact element coaxially to form a current transition. The movable contact element is acted upon by a guided by the housing drive with force. With a single drive so the functions of the separation and the ground can be realized.

STATE OF THE ART

With the generic term, the invention takes a prior art of Switchgear reference, as it is, for example, from Hitachi Review Vol. 51 (2002) No.5 pages 169 to 173 or from EP 1 068 624 B1. The in these Prior publications described switching devices for gas-insulated, Metal-enclosed switchgear each have a three-position switch, the with a single drive all the functions of a separation and a

Earthing switch can perform. This is a in an encapsulating arranged, movable contact element displaced along an axis, which Axis is guided by a disconnector and by a ground contact. With a linear movement of the contact element can be so three switch positions of the Switching device can be achieved. In a first of these three positions is that Contact element with neither the disconnector nor the earth contact in engagement (neutral position), d. H. both an integrated in the switching device angle breaker as An earth electrode integrated into the switching device is also open. In a second position engages the contact element in the isolator contact. The isolating switch of the Trenner is now closed when the earth electrode is open. In the third position attacks the contact element in the ground contact a. The earth electrode is now open Disconnector closed.

Driving force for the movable contact element is transverse to the Transfer movement direction. For this, the encapsulating housing needed transversely to Axis additional space (Hitachi Review) or it will be a specially designed and requires a lever gear receiving conductor (EP 1 068 624 B1).

In publication no. CH-HS 1215 87 D "SF6 gas insulated switchgear (GIS) Type ELK "from BBC Brown Boveri AG Hochspannungstechnik, CH-5401 Baden Switzerland, on page 9 an angle disconnector of type ELK T is described, in which the arranged in a Kapselungsgehäuse, movable isolator contact a nut of a spindle gear is attached. A threaded spindle of the Transmission is connected to a gas-tight through the wall of the encapsulating housing attached rotary shaft. Upon rotation of the shaft, the spindle nut and so that the attached movable isolator contact linear in the housing shifted and can thus in or out of engagement with a in encapsulating arranged, fixed Trennergegenkontakt be brought. One Turning the spindle nut prevents one arranged in a contact carrier and aligned in the direction of movement of the movable isolator contact Guide rail, which with a sliding body of the movable contact interacts.

PRESENTATION OF THE INVENTION

The invention as defined in the claims solves the problem Specify switching device of the type mentioned, which with low Expense can be converted so that it depending on the needs of the functions Disconnect and earth, only disconnect or only earth can do.

The case of the switching device according to the invention provided drive has a longitudinal an axis displaceable and radially guided in a conductor tube holding body on. In addition, a movable contact element of the switching device contains at least one of two with the holding body releasably connectable contact tubes, of which a first the mating contact of the fixed ground contact containing Erders and a second the mating contact of the disconnector contact containing separator. These measures make it possible, by opening or closing at most two detachable connections with a single one Basic switching device Three switching devices with the functions Disconnect and Ground, only Separating or only forming earth. Does the contact element both contact tubes, so the switching device is a combined disconnector and earthing switch (combi separator) educated. It can then in a gas-insulated, encapsulated switchgear the Functions separating and grounding with a single drive having switching device are executed. However, this requires that separation and Grounding point in the system are closely adjacent. Lying separation and Grounding point far apart and is just a grounding or To solve the separation task, so only one of the contact tubes after opening one needs the two detachable connection to be removed so as a switching device with Separator or earth function to create. Therefore, in gas-insulated, encapsulated switchgear the electrical functions separating and grounding, only Disconnect or earth only be covered with a single type of switching device. It Thus, the costs for storage and installation of the system are reduced.

The switching device according to the invention is particularly compact, when the Drive a spindle gear having an axially and centrally through the Ground contact guided threaded spindle and with a holding body supporting or forming spindle nut. Driving force is now exclusively in Moving direction of the movable contact element transferred. It gets so cross to the direction of movement no additional space needed. In addition, the Driving force only in the form of a rotating rotational movement from the outside through transfer the wall of the encapsulating housing. On the wall bushing can a required shaft can be easily sealed. Because this wave is centric is guided by the ground contact, will be present on the anyway Wall bushing for grounding contact no further implementation needed and so space is saved, to carry out a high-voltage conductor can be exploited. The Spindle gear generates a linear movement of the movable contact element only inside the encapsulating housing. This will add space in the Saved inside the encapsulating.

Advantageously, the spindle nut is formed by a threaded nut and the ring-shaped and attached to the outer edge of the threaded nut Holding body. The holding body can then regardless of the exercise to the Gear function of the spindle required threaded nut formed and easy with two for the preparation of the detachable connections with the two contact tubes required connecting parts, such as external threads are provided.

The linear movement of the spindle nut and thus the contact tubes is Maintaining that on an outer edge of the holding body with a an axially aligned in the conductor tube guide rail cooperating Slider is arranged.

Although already by one or two sliders and the corresponding number on guide rails co-rotation of the spindle nut is prevented, it has proved to be useful, uniformly distributed in the circumferential direction on Outside edge of the holding body next to the one still at least two more To arrange sliding body, which with a corresponding number of axially in Conductor tube aligned guide rail cooperate. Through this Measures is a precise and safe guidance of the operation of the Switching device exposed to large forces contact element guaranteed.

Has the housing two openings, one of which is the first from the axis is penetrated and the implementation of the first conductor is used and the second is arranged angled relative to the axis and the implementation of the second conductor, so can with the switching device according to the invention with low assembly costs not only the three electrical functions "disconnect and Earth "," alone separation "or" alone earth "are executed, but it is then for all three electrical functions, the installation of the switching device under one Angle in the switchgear possible. Combination separator, isolator or earth electrode then act on an angled guided current path and the earth electrode may possibly without Connection function to be installed in the system.

Longitudinal connection function is achieved when the housing is a third Housing opening, which the implementation of a line in line with the second Conductor arranged and acted upon by high voltage third Power conductor is used. By the switching device is then a longitudinal connection of Guided switchgear, which in the embodiment as Kombi separator with the connected to it angled led first conductor connected, disconnected or can be grounded, in the embodiment as only disconnector with the first Conductor connected or disconnected and in the embodiment only as Earth electrode can be grounded. In the formation of the inventive Switching device only as earth electrode can then even the longitudinal connection with the angled arranged first conductor in an earthable star point be connected.

DESCRIPTION OF THE DRAWINGS

Fig. 1

eine Aufsicht auf einen Schnitt durch ein Schaltgerät nach der Erfindung, welches als kombinierter Trenn- und Erdungsschalter in eine gekapselte Schaltanlage eingebaut werden kann,

Fig. 2

eine detaillierte Darstellung eines in Fig.1 durch eine Umrandung markierten Bereichs U,

Fig.3

eine Weiterbildung des Schaltgerätes nach Fig.1, welches als Erdungsschalter in eine gekapselte Schaltanlage eingebaut werden kann,

Fig.4

eine Weiterbildung des Schaltgerätes nach Fig.1, welches als Trennschalter in eine gekapselte Schaltanlage eingebaut werden kann,

Fig.5

zwei Ausführungsformen des Schaltgerätes nach Fig.1, welche unter Bildung einer Winkelverbindung (a) oder einer Winkel- und Längsverbindung (b) in die gekapselte Schaltanlage eingebaut werden können,

Fig.6

vier Ausführungsformen des Schaltgerätes nach Fig.3, welche ohne eine Stromverbindung (c), unter Bildung einer Längsverbindung (d), einer Winkelverbindung (e) oder einer Winkel- und Längsverbindung (f) in die gekapselte Schaltanlage eingebaut werden können, und

Fig.7

zwei Ausführungsformen des Schaltgerätes nach Fig.4, welche unter Bildung einer Winkelverbindung (g) oder einer Winkel- und Längsverbindung (h) in die gekapselte Schaltanlage eingebaut werden können.

The invention will be explained below with reference to exemplary embodiments. It shows:

Fig. 1

a plan view of a section through a switching device according to the invention, which can be installed as a combined disconnector and earthing switch in a sealed switchgear,

Fig. 2

a detailed representation of a marked in Figure 1 by a border area U,

Figure 3

a development of the switching device according to Fig.1, which can be installed as a grounding switch in a sealed switchgear,

Figure 4

a development of the switching device according to Fig.1, which can be installed as a circuit breaker in a sealed switchgear,

Figure 5

two embodiments of the switching device according to Figure 1, which can be installed to form an angular connection (a) or an angular and longitudinal connection (b) in the encapsulated switchgear,

Figure 6

four embodiments of the switching device according to Figure 3, which without a current connection (c), to form a longitudinal connection (d), an angular connection (e) or an angular and longitudinal connection (f) can be installed in the encapsulated switchgear, and

Figure 7

two embodiments of the switching device according to Figure 4, which can be installed to form an angular connection (g) or an angular and longitudinal connection (h) in the encapsulated switchgear.

WAYS FOR CARRYING OUT THE INVENTION

In all figures, like reference numerals designate like-acting parts. The In Fig. 1 illustrated switching device is a module of a gas-insulated metal-encapsulated Switchgear formed and has a insulating gas-filled metal housing. 1 on with three openings 2, 3 and 4, each of which is not designated Flange are limited. The flanges are each used to connect to a not illustrated mating flange of a subsequent module of the switchgear. The openings 2 and 3 are each denoted by an unmarked Closing insulator gas-tight finished, the opposite the housing. 1 electrically insulated in each case one can be acted upon by high voltage current conductor. 5 or 6 carries. The opening 4 is optionally with a blind flange or with a also a current conductor 7 carrying bulkhead insulator gas-tight closable.

Optionally, instead of insulation isolators and support insulators with Gas passage openings are used. Central through the opening 3 leads a Axis 8, which is the direction of movement of a movable contact element 9 of the Determined switching device, and along which the current conductor 6 from the outside ins Interior of the housing 1 is guided. The openings 2 and 4 are each other in the Housing 1 in such a way that the current conductor 5 and optionally provided conductor 7 along a centrally guided through the openings line 10 are aligned. Axis 8 and line 10 close together a right Angle and thus determine the geometry of the current conductors 5 and 6 containing current paths. At the current conductor 5 and optionally provided conductor 7 is electrically conductively attached a conductor tube 11, which is the Contact element 9 coaxially and with this regardless of its position Constantly forms a current transition via two non-designated sliding contacts.

The along the axis 8 feasible contact element 9 of the switching device is connected to a Holding body 12 removably attached. The holding body 12 is part of a longitudinal axis 8th gas-tight through the wall of the housing 1 guided drive 13 and can be longitudinal the axis 8 are moved. Accordingly, the position of the Contact element 9. In a apparent from Fig.1 first position is then the Contact element 9 only with the contact tube 11 in electrically conductive Connection. In a second (not apparent from Fig.1) position it is after shifted left and then engages in an electrically conductive manner in a - optionally electrically isolated - attached to the housing 1 and the drive 13th coaxially surrounding ground contact 14. The switching device then acts as earth electrode E. In a likewise not to be seen from Figure 1 third position is the Contact element 9 is moved to the right and then engages in electrically conductive Way in a contact element 9 surrounding and the current conductor. 6 attached separator contact 15 a. The switching device then acts as a separator T.

The contact element 9 contains two axis 8 coaxial surrounding the contact tubes 9 ' or 9 ", which are each detachably connected to the holding body 12 and from the holding body 12 to the left (direction fixed ground contact 14) or extend to the right (direction fixed isolator contact 15). By the single drive 13 can thus in space-saving manner, the functions of the earthing E and the separator T, after removing the contact tube 9 "only the function of the earth electrode E and after removal of the contact tube 9 'only the function of Trenner T are executed. The switching device can therefore vary depending on Purpose in the switchgear for a combined earthing E and Trenner T be executed, or only as a simple E earth or separator T. Ein Example of such a simple E is E 3 and that of such simple disconnector T Figure 4 is removable.

By suitably struck arrangement of the two openings 2 and 3 in Housing 1 can also be used for all three types of switching devices in addition to the three functions earth and separating, only earth or only separating additionally still different connection functions are realized. At the switching device after Fig.6 c) this is shown for an earth electrode E, in which no current path through the device is guided and the earth electrode E only on the guided through the opening 2 Current conductor 5 acts. Only angular connection function is, however, with the switching device shown in Figure 5 a) with combined earthing and Trennerfunktion achieved, in which the separator T an angled, through the Having openings 2, 3 guided and the current conductors 5, 6 containing current path. Only angular connection function is also with the from Fig.6 e) removable earth electrode E or from Fig.7 g) removable separator T achieved. In these embodiments of the invention is in the housing 1 each one provided angled, groundable or separable current path, which also by the openings 2 and 3 is guided.

Through the opening 4 can at the same time for all three types of switching devices in addition the functions earth and separating, only earth or only separating and the Angle connection function additionally realized a longitudinal connection function become. In the combined switching device according to Figure 5 b) is through the opening 4 of the Conductor 7 out, which together with the guided through the opening 2 Electric conductor 5 forms a longitudinal connection. This longitudinal connection can be seen optionally earthed, via the disconnector T with the conductor 6 with the earth open E connected or with E cut-off and T opener isolated by the housing are guided. In the earth electrode according to FIGS. 6 d), only the provided by the current conductors 5 and 7 provided groundable longitudinal connection, whereas in the case of the earth electrode according to FIG. 6 f), a through the longitudinal connection and the Stromleiter 6 formed star point and the separator of Figure 7 h) the Longitudinal connection from the angled arranged to 6 current conductor separated or with this can be connected.

In principle, the drive 13 of the movable contact element 9 by a the wall of the housing 1 guided push rod or a lever, since by this means, the displacement of the contact element 9 is made possible. Out However, to save space, it is recommended that the contact element 9 via to move an integrated into the drive spindle gear, which is an axial and centrally guided by the ground contact 14 threaded spindle 16 has and a spindle nut 17 carrying or forming the holding body 12 (FIG. 1). The threaded spindle 16 has three adjoining sections 18, 19 and 20 on. The section 19 is made of insulating material and thus isolated by the Wall of the housing 1 guided, rotatably mounted in the ground contact 14, metal section 18 of section 20. Section 20 contributes to the Spindle nut 17 cooperating external thread. On the outer edge of the Holding body 12, three sliding bodies 21 are provided, each with one of three axially aligned in the conductor tube 11 aligned guide rails 22. The Slider 21 and accordingly also the guide rails are in Circumferentially evenly distributed (from Fig.1 are only two of the three Sliding body 21 or rails 22 to see).

The actuation of the movable contact element takes place during a switching operation by an outside of the housing 1 at the section 18 initiated rotation of the Screw 16 torque is now on the insulating central portion 19th transferred to the thread provided in section 20 and on the Spindle nut 17 implemented in a longitudinal movement of the contact element 9. The Threaded spindle 16 is cantilevered, since the radial guidance of the spindle 16th takes place through the spindle nut 17. Here, the sliding body 21 slide along the Guide rails 22 and thus prevent co-rotation of the spindle nut 17th Mit a corresponding drive control, the movable contact element 9 in easily in each of the three positions E 'E' and T 'off', Earth E and disconnector T "off" (neutral position) or earth E "off" and disconnector T to be driven "one".

Although already by one or two slider 21 and the corresponding Number of guide rails 22 co-rotation of the spindle nut 17 prevents it has proved to be expedient, three or possibly even still provide more sliders and guide rails. It will be such a precise and safe guidance of the large forces acting on the switching device reached exposed contact element 9.

As can be seen Fig.2, the spindle nut 17 is a Threaded nut 23 and the holding body 12 is formed. The holding body 12 is as Carrying ring executed and about by a screw on the outer edge of the Threaded nut 23 attached. The contact tubes 9 'and 9 "of the movable Contact element 9 are detachable, for example, by screwing on the holding body 12 attached.

LIST OF REFERENCE NUMBERS

1

encapsulating

2,3,4

openings

5, 6, 7

conductor

8th

axis

9

contact element

9 ', 9 "

contact tubes

10

line

11

conductor tube

12

holding body

13

drive

14

ground contact

15

trenner Contact

16

screw

17

spindle nut

18, 19, 20

spindle sections

21

sliding

22

guide rail

23

threaded nut

e

earthing

T

separator

Claims (8)

Switching device with separation and / or grounding function, containing
an insulating gas-filled encapsulating housing (1),
a ground contact (14) attached to the housing (1),
a separator contact (15) attached to a first current conductor (6) which can be acted upon by high voltage,
a movable contact element (9) which can be displaced along an axis (8) and can be brought into or out of engagement with at least one of the two fixed contacts (14, 15),
a conductor tube (11) fastened to a second current conductor (5) which can be acted upon by high voltage and which comprises the movable contact element (9) coaxially to form a current transition, and
a driven by the housing (1) and the movable contact element (9) acted upon by force drive (13),
characterized in that the drive (13) has a longitudinal axis (8) displaceable and in the conductor tube (11) radially guided holding body (12), and
in that the contact element (9) contains at least one of two contact tubes (9 ', 9 ") that can be detachably connected to the holding body (12), of which a first (9') is the countercontact of an earth electrode (E) containing the fixed ground contact (14). and a second (9 ") forms the mating contact of a disconnector (T) containing the disconnector contact (15). Switching device according to claim 1, characterized in that the contact element (9) contains both contact tubes (9 ', 9 "). Switching device according to one of claims 1 or 2, characterized in that
the drive (13) has a spindle drive with a threaded spindle (16) guided axially and centrally through the grounding contact (14) and with a spindle nut (17) carrying and / or forming the holding body (12). Switching device according to claim 3, characterized in that
the spindle nut (17) is formed by a threaded nut (23) and the holding body (12) which is of annular design and is fastened to the outer edge of the threaded nut (23). Switching device according to one of claims 3 or 4, characterized in that
on an outer edge of the holding body (12) with a axially in the conductor tube (11) aligned guide rail (22) cooperating sliding body (21) is arranged. Switching device according to claim 5, characterized in that
In the circumferential direction evenly distributed on the outer edge of the holding body (12) next to the one (21) at least two further sliding body (21) are arranged, which cooperate with a corresponding number of axially in the conductor tube (11) aligned guide rail (22). Switching device according to one of claims 1 to 6, characterized in that
the housing (1) has two openings (2, 3), of which a first (3) is penetrated by the axis (8) and serves to pass the first conductor (6) and the second (2) to the axis (8 ) is arranged angled and the implementation of the second conductor (5) is used. Switching device according to claim 7, characterized in that
the housing (1) has a third housing opening (4) which serves to pass a third conductor (6) arranged in line (10) with the second current conductor (5) and can be acted upon by high voltage.

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