DE2165284A1 - ARRANGEMENT FOR INSERTING A PROBE OR SWITCHING ORGANIC INTO PRESSURIZED VESSEL - Google Patents

Description

Arrangement for introducing a probing or switching element into pressurized containers

It is known to provide an inspection opening in the wall of containers, which is secured by a lid, e.g. pressure-tight, is lockable. To the. Examine the interior, the cover is removed so that the released. Inspection opening measuring and exploratory organs can be introduced. If the container is operationally pressurized, this pressure must be removed before the cover is removed. If the examination is to take place under operational conditions, the pressure must be built up again after the examination organ has been brought in. The same applies accordingly also for vacuum containers. Such an examination method is complex and time-consuming.

For pressurized containers with sulfur hexafluoride (SFg) insulated switchgear and equipment exists, for example often the task of determining the dielectric values of the system. Since that as an insulating or in the case of SFg used as an extinguishing agent on switches should not be lost for cost reasons, it is pumped before the examinations the SFg, then opens an existing inspection opening and after this opening is closed it fills the interior again. Investigations under operational conditions are difficult to do.

The invention relates to an arrangement for introducing a probing or switching element into pressurized ones Containers, especially of SFg-insulated switchgear and -geraten, wherein a pressure-tight closable face opening is provided for the passage of the organ in the container wall.

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30 9 8 27/0625

The task here is to introduce a probing or switching element into the container as required, without that the interior of the container comes into communication with the exterior. For pressurized containers with a gas atmosphere Accordingly, the pressure should be largely maintained without changing this gas atmosphere.

This ^ object is achieved according to the invention in that the passage opening is closed by a valve whose movable valve body is common in its open position forms with the valve housing a passage channel for the organ, and that the organ in one with a valve housing pressure-tightly coupled guide body is displaceable and sealed against the outside space.

The probing or switching organ to be introduced if necessary is initially via its guide body with a valve housing connected pressure-tight, then the movable valve body moves into the open position, which is thus together with the valve housing releases a passage for the organ, whereupon the probing or switching organ through the valve exposed to the atmosphere of the container interior or introduced into the interior of the container *

Using the invention are those with the preparation reduced work associated with investigations in the interior of pressurized containers.

In an advantageous embodiment of the invention, the organ is elongated and rigid and the passage channel straightforward.

When operating electrical switchgear, there is often the need for maintenance work on parts of the system. These parts of the system must be used with

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Safety can be de-energized. To protect the personnel during maintenance work from the consequences of an erroneous To protect the voltage from being switched on again, so-called work earths are switched on, which are the electrical Short-circuit the conductor to the housing. Such working earth electrodes are therefore only required on a case-by-case basis. By application the invention, it is possible to reduce the cost of working earth within compressed gas-insulated switchgear and -Devices to be kept low when the switching pin of a working earth rod is used as the switching element to be introduced if necessary will. This switching pin of the working earth rod is in one embodiment of the invention on the guide body and for Valve housing connected to the container in an electrically conductive manner.

In a further development of the invention, the organ can also be designed as a measuring clamp and encased in an insulating material electrical conductor be formed. This electrical conductor has a preferably conically shaped probe tip which is intended for engagement with a conductor within the switchgear. It is also possible that the free end of the organ can be moved into an associated contact of a conductor guided in an insulated manner in the container.

Instead of the elongated and rigid formation of the organ; a flexible design is also possible. This execution offers the advantage that, for example, the passage channel through the valve does not have to run in a straight line and that the organ can be moved within the interior, possibly by external means. The organ can be an optical one Be a light guide that allows an observation of arcs.

Furthermore, the organ can contain a thermal sensor in order to measure temperature to be carried out at certain points in the interior.

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..- In a slightly different version, the organ is with a j element equipped for gas analysis. Such a design of the probing organ enables the investigation of the gas atmosphere immediately after the occurrence of an electric arc or to investigate signs of aging.

Furthermore, the organ can be provided with a pressure measuring element which statically or dynamically determines the pressure within the interior space records.

• Further advantages and details of the invention are at hand described in the drawing.

Figure 1 shows schematically partially a pressurized container of an electrical switchgear in section.

In Fig. 2 a part of a container wall with a valve is shown schematically in a cross section.

FIG. 3 shows the cross section of a switchgear which is insulated with SFg and has a valve and one connected to it Probe.

In Fig. 4 is the cross section of a valve with a grounding device drawn schematically.

FIG. 1 shows part of a pressurized container 1, in the interior 2 of which an electrical conductor 3 is guided in an electrically insulated manner via insulators 4. In the interior 2 of the pressure-tight container 1, sulfur hexafluoride (SFg) is filled as an insulating agent. The container 1 has a flange 5, which is closed by a lid part 6 a pressure-tight.

In the exemplary embodiment shown, the cover part 6 has an opening 7 for the passage of a probing or switching element which is closed by a valve 8.

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As shown in Fig. 2 can be removed · ,, which is' connected in the valve housing 9 and the container wall. · Formed lid part 6 a pressure-tight with aineia "valve housing 9 of the Yentils a Dichtungselement- -10 movably sis Ifsntilkörper 11 of ύοά Qiiieiü _v Gr- ÄüTü 12 'ysrdrslibar is ο from the drawn! Sperr stsllnahm ciea Vssntilkorpsr-o 11 kaaa by pivoting the handle 12 is, P ^ ailriontimg 13 the movable yentil body in ssis.3 G; i:.'? -? - ".? T -3llUiig required WSZ ³ OPa ₅ in the er iait

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To introduce a probing or switching element, the disk 1.5 is removed from the valve housing 9 when the valve body 11 is in the blocked position and replaced by a guide body 16, as can be seen from FIG. 3, for example . this via the sealing member 17 with the valve housing ^9.:. a pressure-tight connected Thereafter, the handle can be actuated so in the direction of arrow 13 12 ^ that the movable valve body 11 comes into its open position ₉ in which it forms a passageway 14 for a probing member 18, this is in the illustrated embodiment, elongated and rigid.

The organ 18 is in the A ^ sführ-ungsbeispiel according to Fig _e 3 as

BAD ORIG (NAi

Measuring terminal executed, 'which consists of an electrical conductor 20 and an insulating jacket 21. The conductor 20 is led to the outside via an insulating material bushing 22 at the free end of the guide body 16 , so that the free end 23 of the conductor 20 to the touch of the touch pad 24 of the conductor 20 with the conductors ρ of the control panel is fun can be fed or tapped off, _t D-sr- electrical conductor 20 can be a vorz-uirswe.iir * liovi: .S'-zli% ■?. ££: -: - Bt- ~ featspitse a wslseil, kit is advantage cLir. ^ ~ u "t rates CM ί, ΐΛ ^ ir ^ eii suigsnopi Kentakt 25 des' £ il keep / ■"_; 6 Ls ^ ll ·. ^ :: - *. / r-siülirtaa head

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represents Ventilkorpsr 11 durofe BetStigan clss Griffss 12 entgsgsE, the Pfeilrichtimg 13 again transferred in the Sperrstsllung After be placed releasing the guide Körpere Io -yoin valve housing 9, another probing or switching member or the sealing cover 1.5 elements by means Diohtungs screwed back "

Instead of the rigid, elongated measuring clamp 18 shown in FIG. 3, a flexible probe can also be used organ use. The probing member can be an optical light guide with the help of which in the interior of the container 1 arcing or the nature of contact systems can be observed «, It is also possible that the probing device contains a thermocouple for temperature measurements some applications are advantageous to monitor the organ with an element for gas analysis to prevent signs of aging or to be able to detect decomposition products generated under the influence of an electric arc. After all, it is possible that To provide the probing organ with a pressure measuring element so that the pressure prevailing in the interior 2 is static and given « if it can also be monitored dynamically,

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BATH ORIGINAL

In the embodiment shown in FIG. 4, this is Valve housing 9 connected to its drawn in the open position valve body with a guide body 16, the one Has switch pin 30 of a work earth electrode. The tip 31 of the switching pin 30 is for engagement with one of FIG. 3 removable contact 25 of the electrical conductor 3 intended to electrically connect the conductor 3 with respect to the housing wall 1, 6 short-circuit and ground. In the exemplary embodiment according to FIG. 4, the switching pin 30 is displaceable in the guide body 16 supported and sealed by a sealing element 32 from the outside. The guide body 16 has a switching pin 30 surrounding cylindrical bore 33, in which a piston 34 connected to the switching pin 30 is displaceable runs. The piston "34 is sealed against the cylindrical bore 33 via a sealing element 35, so that it the cylindrical bore 33 divided into two subspaces 33a and 33b.

The guide body 16 is connected to the interior 2 of the container 1 via a bore 36. The bore 36 is connected via a line 37 to two working valves 38, 39 which alternately feed the subspaces 33a and 33b of the cylindrical bore 33. When the valve 39 is opened, a pressure occurs in the subchamber 33b which corresponds to the pressure prevailing in the container interior 2 i. Since the effective area of the piston 34 is larger than the effective area of the tip of the switch pin, when the valve 43a is opened, the piston and thus also the switch pin 30 are moved in the direction of arrow 40, ie moved into the closed position. In the process, the piston reaches its end position 34 a, dashed and dotted, in which it touches contact springs 41 and thus establishes an electrical connection between the conductor 3 and the guide housing 16 . A connecting terminal 42 is connected to the guide housing 16 in an electrically conductive manner.

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If during the closing movement of the switching pin 30 between ^! * see the conductor 3 and the container wall 1 is still a potential - '; · tial, an arc is created between the switching. pin 30 and the conductor 2, which leads to an increased pressure of the insulating agent in the interior 2. This increase in pressure also acts on the piston 34, which thus accelerates the closing movement. It is therefore ruled out that the switching pin or the piston is moved in the opposite direction to the arrow 30 in such cases.

To open the switching pin 30, the valves 39 and 43a closed and the valves 38 and 34b opened, whereby the pressure prevailing in the interior 2 builds up in the subspace 33a, will. This pressure moves the piston 34 and thus the switching pin 30 into the end position shown. The guide body 16 is equipped with a further valve 43c, which is used to monitor the switched-on position of the piston 34.

A spring-loaded indicator element 44 is pressed against the piston 34, which indicates the open position of the switching pin 30 in one Window 45 displays.

In the embodiment shown in FIG Switching pin 30 is driven by a double-acting pneumatic press arranged in the guide body 16. A hydraulic one However, the drive can also be used. It is of course also possible to use the switch pin 30, e.g. to be driven mechanically via a spindle.

Using the invention it is possible to replace one A large number of permanently installed earthing devices (working earth electrodes) a comparatively small number of earthing devices (Guide body 16 with switching pin 30) to be provided, which via several existing valves 8, if necessary, into the interior of the container 1 are introduced.

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Particularly in the case of large systems, the arrangement of several valves 8 results in the passage of probing or switching elements the further advantage that they can serve as auxiliary openings when filling the container 1 with sulfur hexafluoride » The maintenance work for the gas supply can thus be effectively reduced.

4 figures
12 claims

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309827/0625

Claims (12)

Claims Arrangement for introducing a probing or switching in pressurized containers, especially those insulated from SFg Switchgear and switchgear, with a pressure-tight closable opening for the passage in the container wall of the organ is provided, characterized in that the passage opening (7) is closed off by a valve (8) is, ^ the movable valve body (11) in its open position together with the valve housing (9) forms a passage (14) for the organ (18, 30), and that the organ (18, 30) in a pressure-tight coupling with the valve housing (9) Guide body (16) is displaceable and sealed from the outside, 2. Arrangement according to claim 1, characterized in that the member (18, 30) is elongated and rigid and that the passage channel (14) is straight. 3. Arrangement according to claim 1 or 2, characterized in that the member (30) is designed as a switching pin of a working earth rod and is connected to the container (1) in an electrically conductive manner via the guide body (16) and the valve housing (9). 4. Arrangement according to claim 3, characterized in that the switching pin (30) of one in the guide body (16) arranged, double-acting pneumatic press (33, 34) can be driven. 5. Arrangement according to claim 1 or 2, characterized in that the organ (18) designed as a measuring probe and one with Insulating material (21) sheathed electrical conductor (20) is formed. 6. Arrangement according to claim 5, characterized in that the electrical conductor (20) has a preferably conically shaped probe tip (24). 3Q9827 / Q62S ^ -11- 7. Arrangement according to one of claims 2 to 6, characterized in that that the free end (24) of the organ is guided into an associated contact (25) in an isolated manner in the container Head (3) is indentable. 8. Arrangement according to claim 1, characterized in that the member (18) is designed to be flexible. 9. Arrangement according to claim 1, 2 or 8, characterized in that the member (18) is an optical light guide., 10. Arrangement according to claim 1, 2 or 8, characterized in that the member (18) contains a thermal sensor, 11. Arrangement according to claim 1, 2 or 8, characterized in that that the organ (18) is equipped with an element for gas analysis. 12. Arrangement according to claim 1, 2 or 8, characterized in that the member (18) is provided with a pressure measuring member. 309827/0625