EP1569256A1 - Insulated earthing switch for GIS - Google Patents

Abstract

The device (1'') has a grounding contact (50) on the encapsulation side, an inner grounding contact and a grounding housing (3a) for accommodating a grounding drive (11) and mechanically connected to a gas isolated switching system or GIS housing (2). An electrically isolated measurement electrode (52) is provided for electrically contacting the grounding contact on the encapsulation side from the outside. The encapsulation side grounding contact, the measurement electrode and the grounding housing are commonly mounted on the grounding assembly side and the encapsulation side grounding contact and the measurement electrode are electrically isolated from the grounding housing and the GIS housing. An independent claim is also included for an electrical switching system, especially a high or medium voltage system.

Description

TECHNICAL AREA

The invention relates to the field of high voltage engineering, in particular electrical insulation and Connection technology for gas-insulated at ground potential Switchgear (GIS). It starts from a grounding device and a gas-insulated switchgear according to Preamble of the independent claims.

STATE OF THE ART

Earth-switching devices in existing gas-insulated switchgear can be implemented as so-called "isolated earth electrodes" become. In these variants, the earth housing of the remaining housings of the gas-insulated switchgear (GIS) separated by an insulating intermediate flange. in the Normal operation, this insulating flange is replaced by a massive earth connection bridged. For measurements in which a measuring signal applied to the earth contact system or this is taken over this bridging is taken away.

Such an isolated earth electrode is in the article of Okabe et al., "Serialization of Standard Gas Insulated Switchgear ", Hitachi Review Vol. 51 (2002), No. 5. The invention takes this state of the art Reference. There is a conventional combined disconnector / earthing switch or Dreistellungstrenner shown in the a displaceable contact part by linear movement between the positions "isolator switched on", d. H. Disconnector contact closed, "Disconnector switched off", d. H. Disconnector contact opened and "earthing switched on", d. H. Earth contact additionally closed, movable. Of the Earthing contact is on a flat lid of the Gas-insulated switchgear (GIS) on the inside of the lid assembled. The earthing contact is electrically from the GIS housing isolated from this led out and can outside shorted to the GIS housing via a contact clip become.

EP 1 068 624 B1 also discloses a combined Disconnector / earthing switch. Here is the earth contact designed as pinartiges contact piece, which on a Contact carrier is seated, which in turn at one by the GIS housing wall guided to the outside, against the GIS housing wall electrically insulated bolt is held.

PRESENTATION OF THE INVENTION

The object of the present invention is to provide an improved insulated earth electrode for gas-insulated switchgear specify. This object is achieved by the Features of the independent claims solved.

The invention consists in a grounding device, in particular for gas-insulated, encapsulated high-voltage switchgear, comprising an encapsulation-side ground contact, an internal earthing contact and a grounding housing, which serves to receive an earth drive and that an earth mounting side of the gas-insulated switchgear with a GIS housing of the gas-insulated switchgear mechanically is connected, wherein an electrically insulated measuring electrode for electrical contacting of the encapsulation side Earth contact is present from the outside, where Furthermore, the encapsulation-side ground contact, the measuring electrode and the earth housing together on the earth mounting side are arranged and the encapsulation-side ground contact and the measuring electrode opposite the earth housing and the GIS housing are electrically isolated. The earth electrode is therefore complete, including drive and measuring tap, on only one side or mounting surface of the GIS encapsulation arranged and accessible from this side. The earth housing serves to accommodate components of the earthing switchgear and typically houses the earth drive. Of the earth contacts is at least one movable earthing contact. By the invention becomes a very easy mounting and accessibility of the earth and a very simple arrangement and operability of Measuring electrode for electrical measurements on active parts of reached the same page. This will also be a very realized compact design of the earth.

In a first embodiment, the measuring electrode or the measuring tap through the GIS housing or the earth housing electrically isolated to the outside and / or by an externally mountable earth connection can be short-circuited with the GIS housing and / or the grounding housing. The measuring tap is therefore for electrical Contacting and execution of the encapsulation side Earth contact through the GIS housing or earthing housing permanently installed. This causes only minor Additional costs. This eliminates a special, expensive Isolierflansch with intricately cast-in bolts on both sides, the former possibly between GIS housing and earth housing had to be mounted for measurement purposes. The before different building types of isolated and non-isolated Erders are now structurally executable. If all Erder isolated, measurements can also be made different places in the GIS plant and therefore with better meaningfulness.

In another embodiment, the encapsulation side Earth contact and the measuring electrode opposite the Earth drive and / or compared to any existing electrical connections for the earth drive and / or to neighboring phases, in particular to one if necessary existing drive linkage to neighboring phases, electrically isolated. This simplifies the implementation electrical measurements, since only the ground connection removed but no other elements, like z. B. drive cable or drive linkage to neighboring phases in three-phase or single-phase encapsulated switchgear.

The embodiment according to claim 4 has the advantage that it does not matter for the purposes of the invention, whether the encapsulation-side ground contact a movable Earth contact or a fixed contact. Thus, the Invention applicable to any type of earth independently of whether the mobile earth contact from the inside to the outside, d. H. towards the enclosure wall, or from outside is movable inside.

The embodiment according to claim 5 has the advantage that the earth electrode as a whole hangs on a single flange, which at the same time carries the earthing housing (support flange) and a has separate access for the measuring electrode (measuring flange). This arrangement is particularly space-saving.

The claims 6-7 relate to embodiments of a Earth electrode and in particular Schnellerder, in which the flange and the measuring flange orthogonal to each other are.

Claim 10 relates to an electrical switchgear comprising a Erdschaltgerät as described above and with the there mentioned advantages.

Further embodiments, advantages and applications of the invention result from the dependent claims as well as from the following description and the figures.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1a, 1b

do not show schematically in cross section insulated earth switching device according to the state of Technology (Fig. 1a) with associated circuit diagram (Fig. 1b);

Fig. 2a-2c

show schematically in cross section an isolated Earth switching device according to the state of Technique (Fig. 2a) with associated circuit diagram (Figures 2b, 2c);

Fig. 3

shows schematically in cross section an embodiment a separate earthing device with inventively insulated earthing switch pin; and

Fig. 4

shows schematically in cross section an embodiment of a combined separator / earth electrode with earth-electrode contact insulated according to the invention.

In the figures, the same parts are given the same reference numerals Mistake.

WAYS FOR CARRYING OUT THE INVENTION

Fig. 1a shows a conventional non-insulated earth switching device 1 in an encapsulated gas-insulated switchgear 13. The housing 2 of the gas-insulated switchgear 13 encloses a gas space 9, which is preferably filled with SF ₆ gas under some bar pressure. The Erderanbau 3 with its grounding housing 3a is attached to the GIS housing 2 via a mounting flange 4a. A movable earthing contact pin 5 is moved from the Erderantrieb 11 typically arranged in the earth electrode 3a along a drive movement 11a to the earth-fixed contact 6 in order to earth active parts 7 of the encapsulated gas-insulated switchgear 13. In normal operation of the switchgear 13, the pin 5 is withdrawn and the active parts 7 are under high voltage and / or carry operating current or short-circuit current. The active parts or conductors 7 are held by insulators 8, in particular support insulators 8 and bulkhead insulators 8, in the gas-filled interior 9 of the enclosure 2. The insulators 8 are in turn supported on the GIS encapsulation 2 by means of insulator flanges 8a. The longitudinal axis of the non-insulated Schnellerders 1 is designated A.

Fig. 1b shows the circuit diagram of the non-isolated Switching device 1, after which the ground potential through the GIS housing 2 is defined and the entire device 1 together the earth housing 3a and the earth contacts 5, 6 in the grounding case electrically connected to ground potential. The earth casing 3a or the earth attachment 3 are additional via drive lines 12 and / or drive linkage 11b electrically connected to the outside world.

FIG. 2a shows the earth electrode or fast line 1 'as before, however, in an isolated embodiment. For this is the Erderanbau 3 with the grounding housing 3a by an insulating Intermediate flange 4b of the GIS housing 2 electrically isolated. In normal operation, the intermediate flange 4b bridged by a grounding strap 10, which is the earth housing 3a shorts with the GIS housing 2. Should electrical measurements are carried out, so is the hanger 10 removed and the earth housing 3a serves as a Measuring electrode. That's why other electrical connections must be made to the earth housing 3a, in particular electrical Connections 12 and drive linkage 11b, are removed. This is awkward and labor intensive.

Fig. 2b and Fig. 2c show the circuit diagram of the isolated Earth switching device 1 'in normal operation or in electrical Measurements of active parts 7 of the switchgear 13 in earthed condition. When removed bracket 10 so is the Grounding canceled and the measurements can be performed become.

For most modern day earth switchgear implementations 1, 1 'is the moving contact 5 from the outside, d. H. from the enclosure 2, inwards to the active parts 7 moved. The earthing contact 6 is typically in the active parts 7 integrated in the inner tube. Known earth switch devices 1 or 1 'are attached to suitable flanges 4a mounted in the switchgear 13. These flanges 4a are either standard flanges, which are used with each connection or smaller flanges, which are specially designed for the cultivation of grounding devices 1, 1 'are designed.

Fig. 3 shows a first and Fig. 4 shows a second embodiment the invention. The earth switch device 1 '' comprises an encapsulation-side ground contact 50, 51; 500, an internal earthing contact 60; 600 and a terrestrial housing 3a, which serves to receive the earth drive 11 and that on an earth mounting side 3b of the gas-insulated Switchgear 13 with the GIS housing 2 of the gas-insulated Switchgear 13 is mechanically connected, wherein a electrically insulated measuring electrode 52, 520 for electrical Contacting the encapsulation-side ground contact 50, 51; 500 is present from the outside. According to the invention are in Erdderschaltgerät 1 '' the encapsulation-side ground contact 50, 51; 500, the measuring electrode 52, 520 and the earth housing 3a together on the same ground mounting side 3b are arranged and are the encapsulation-side ground contact 50, 51; 500 and the measuring electrode 52, 520 opposite to the Earth case 3a and the GIS housing 2 electrically isolated. In the following example embodiments are given.

Advantageously, the encapsulation-side ground contact 50, 51; 500 and the measuring electrode 52, 520 opposite the earth drive 11 and / or to any existing electrical connections 12 for the earth drive 11 and / or towards neighboring phases, especially opposite an optionally existing drive linkage 11b Neighbor phases, electrically isolated. Preference is given to the earth connection 53, 530 on the measuring flange 42 or the earth housing 3a mountable ground connection bracket 53, 530, in the mounted state, the measuring electrode 52, 520 with the measuring flange 42 or the earth housing 3a electrically short-circuits. Electrical measurements are therefore simplified because except the ground connection 53, 530 no other interrupted electrical contacts to the earth housing 3a Need to become. Due to the easy handling of the Personal protection improved during the measurements.

An earth assembly 3 enclosed by the earth housing 3 a can via a combined support and measuring flange 40; 41, 42; 400 on the ground mounting side 3b with the GIS housing 2 mechanically be connected. The earthing housing is preferred 3a, the combined support and measuring flange 40; 41, 42; 400 and the GIS housing 2 electrically connected to each other. The earth housing 3 a is therefore always directly with the GIS housing 2 connected and requires no insulating Intermediate flange.

According to FIG. 3, the encapsulation-side ground contact is a movable earthing contact 50, 51 and includes an earthing contact pin 50, by a Isolierschaltstange 51 from Earth drive 11 electrically isolated and through the Isolierschaltstange 51 is drivable. Isolated is executed So only the pin 50 and not the entire earth electrode 1''. The internal earthing contact is then as earth contact 60 executed. The combined support and measuring flange 40; 41, 42 may, as shown, a along of the movable earthing contact 50, 51 extended support flange 41 and one laterally attached to the support flange 41 Measuring flange 42 for receiving and carrying the measuring electrode 52 have. The lateral access to the isolated executed contact pin 50 is connected to a ground connection 53 electrically conductive with the GIS housing 2 connected. This connection 53 is mounted in normal operation and creates contact between the ground contact pin 50 and GIS housing 2 and optionally earth housing 3a. For measurements where a measurement signal is applied to the earth contact system applied or tapped on this, only the earth connection 53 needs to be removed without that further work on the drive 11, its wiring 12 or his rod 11b are necessary.

Inside the support flange 41 may be a dielectric Isolation 43 for electrical insulation of the support flange 41 from the movable earthing contact 50, 51, in particular from Earth contact pin 50, be arranged. In addition, also in the Inside the measuring flange 42 a dielectric insulation 44 for the electrical insulation of the measuring flange 42 of the measuring electrode 52 may be present.

Fig. 4 shows a second embodiment of the invention. This is exemplary using a combined isolator / earthing contactor 1 '' shown. The separation section 14 and the grounding path 15 are here by way of example in series arranged. The active parts 7 include next the conductors 7, a holder 7a, the optional formed as a power connection 7a along the transverse axis B. and a shield 7b for the movable contact tube 113 of the isolator / earthmover. Again, it's an earth-drive 11, a movable earth contact 600 and a Earth contact 500 available. The example here shown combined disconnector / earth drive includes besides the motor unit 11, a drive shaft 110, an insulating shaft 111 and a spindle 112 for driving the contact tube 113 and in particular the movable earthing contact 600th

According to FIG. 4, therefore, the encapsulation-side ground contact formed as a stationary contact 500, which by a dielectric Insulation 540 from the earth housing 3a electrically is isolated, and the internal ground contact is the movable earthing contact tube 600. The movable earthing contact 600 and the earth contact 500 are in the gas space. 9 the gas-insulated switchgear 13 is arranged. The earth contact 500 typically has a contact system 501, z. B. coil springs o. Ä., On.

By mounting the earth switch 1 ', inclusive Earth housing 3a, drive 11 and insulated measuring tap 52, 520, on a single earth mounting side 3b, namely at a radial position (Fig. 3) or axial end Position (Figure 4) on the GIS housing 2, becomes a very compact Construction and at the same time easy operation of the measuring tap 53, 530 reached. This applies to single phase or Three-phase encapsulated switchgear 13.

The earth switching device 1 'is particularly suitable for gas-insulated Medium or high voltage switchgear 13 suitable. claimed is also a switchgear 13 with such Earth switching device 1 '.

LIST OF REFERENCE NUMBERS

1

Conventional non-insulated earth electrode

1'

Conventional isolated earth electrode

1''

Insulated earth electrode according to the invention

2

GIS housing

3

Earthmoving with earth drive

3a

earthing switch housing

3b

earthing switch mounting side

4a

Flange for earth mounting, mounting flange, flange (State of the art)

4b

Intermediate flange for earth mounting, insulating flange (State of the art)

40, 400

combined support and measuring flange for soil cultivation, Earth flange with measuring tap

41

extended support flange

42

Measuring flange, measuring bushing for earthing contact pin

43

Insulation between support flange and contact pin

44

Isolation between measuring flange and measuring electrode

5

Movable earthing contact pin

50

housing-side earth contact, movable insulated earthing switch contact pin

51

Isolierschaltstange for earthing contact pin

52

Measuring electrode, lateral measuring tap on earth contact pin

53

Earth connection for measuring electrode, removable Pin grounding strap

500

Housing-side earthing contact, in the mounting cover integrated earthing contact

501

Contact system

520

Measuring electrode, axial measuring tap on earthing contact

530

Earth connection for measuring electrode, removable Solid-contact grounding strap

540

Insulation between earthing housing and earthing contact

6

earthing switch fixed

60

internal earthing contact, earthing contact

600

internal earthing contact, movable earthing contact tube

7

Active parts of the switchgear, power conductors (auf High-voltage potential)

7a

Bracket, optional power connection

7b

Shielding for movable contact tube

8th

Isolator, post insulator, isolator

8a

insulator flange

9

Gas room, SF ₆

10

Ground connection, grounding strap

11

earthing switch drive

11a

drive movement

11b

Drive linkage to neighboring phases

110

drive shaft

111

insulating shaft

112

spindle

113

contact tube

12

Electrical connections

13

Gas-insulated switchgear (GIS)

14

isolating distance

15

ground distance

A

Axle of the switchgear section, longitudinal axis

B

transverse axis

Claims (10)

Earth-switching device (1 ''), in particular for gas-insulated high-voltage switchgear (15), comprising an encapsulation-side earthing contact (50, 51, 500), an inner earthing contact (60, 600) and a grounding housing (3a), which is adapted to receive an earth drive (11 ) and which is mechanically connected to an earth mounting side (3b) of the gas-insulated switchgear (13) with a GIS housing (2) of the gas-insulated switchgear (13), wherein an electrically insulated measuring electrode (52, 520) for electrically contacting the encapsulation-side earthing contact (50, 51; 600) from the outside, characterized in that a) the encapsulation-side ground contact (50, 51; 500), the measuring electrode (52, 520) and the grounding housing (3a) are arranged together on the ground mounting side (3b) and b) the encapsulation-side ground contact (50, 51, 500) and the measuring electrode (52, 520) are electrically insulated from the grounding housing (3a) and the GIS housing (2). The earth switching device (1 '') according to claim 1, characterized in that the measuring electrode (52, 520) a) is carried out by the GIS housing (2) or the earth housing (3 a) electrically insulated to the outside and / or b) by an externally mountable earth connection (53, 530) with the GIS housing (2) and / or the earthing housing (3a) is short-circuited. The grounding switching device (1 '') according to any one of the preceding claims, characterized in that the encapsulation-side earthing contact (50, 51, 500) and the measuring electrode (52, 520) with respect to the earth drive (11) and / or against any electrical connections ( 12) for the earth drive (11) and / or neighboring phases, in particular with respect to any existing drive linkage (11b) to neighboring phases, are electrically isolated. The earth switching device (1 '') according to any one of the preceding claims, characterized in that a) the encapsulation-side ground contact (50, 51, 500) is a movable earthing contact (50, 51) and an earth contact pin (50) which is electrically insulated and driven by a Isolierschaltstange (51) from the earth drive (11) and the internal ground contact (60; 600) is a fixed earth contact (60) or b) the encapsulation-side ground contact (50, 51; 500) is a fixed earth contact (500) electrically insulated from the grounding housing (3a) by a dielectric insulation (540), and the in-ground contact (60; 600) comprises a movable earth contact pipe (600) ). The earth switching device (1 '') according to any one of the preceding claims, characterized in that a) one of the earth electrode housing (3a) enclosed earth assembly (3) via a combined support and measuring flange (40; 41, 42; 400) on the ground mounting side (3b) with the GIS housing (2) is mechanically connected, and b) in particular that the earthing housing (3a), the combined supporting and measuring flange (40; 41, 42; 400) and the GIS housing (2) are electrically conductively connected to one another. The earth switching device (1 '') according to claim 4a and 5, characterized in that the combined supporting and measuring flange (40; 41, 42) has a flange (41) extending along the movable earthing contact (50, 51) and one on the supporting flange (40). 41) laterally mounted measuring flange (42) for receiving and carrying the measuring electrode (52). The earth switching device (1 '') according to claim 6, characterized in that a) in the interior of the support flange (41) is a dielectric insulation (43) for electrical insulation of the support flange (41) from the movable earthing contact (50, 51), in particular from the earth contact pin (50), is present and / or b) in the interior of the measuring flange (42) a dielectric insulation (44) for electrical insulation of the measuring flange (42) of the measuring electrode (52) is present. The earth switching device (1 '') according to any one of the preceding claims, characterized in that the earth connection (53, 530) is a Erdverbindungsbügel (53, 530) aufmontierbarer on the measuring flange (42) or the earth housing (3a), which in the mounted state the measuring electrode (52, 520) electrically short-circuits the measuring flange (42) or the earth housing (3a). The earth switching device (1 '') according to one of the preceding claims, characterized in that the earth switching device (1 '') a) as a separate Erdschaltgerät (1 ''), in particular as Schnellerder (1 ''), designed or is part of a combined disconnector / earthing switchgear (1 '') and in particular with a common disconnector / earth drive (11) equipped, and / or b) is designed for a single-phase or three-phase encapsulated switchgear (13). Electrical switchgear (13), in particular high-voltage or medium-voltage switchgear (13), characterized by a earth-switching device (1 '') according to one of the preceding claims.

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