WO2017121665A1 - Electrical insulation arrangement and method for maintaining an electrical insulation arrangement - Google Patents

Abstract

The invention relates to an electrical insulation arrangement having a first housing (1, 2, 3) and a second housing (12, 13, 14, 15). The first housing (1, 2, 3) and the second housing (12, 13, 14, 15) delimit a fluid chamber (10a, 10b, 10c), within which an electrically insulating fluid is arranged. The second housing (12, 13, 14, 15) is part of a filter device, which is connected to the first housing (1, 2, 3) via a fluid channel (11a, 11b, 11c, 11d).

Description

description

Electrical insulation arrangement and method for maintenance of an electrical insulation arrangement

The invention relates to an electrical insulation arrangement comprising a fluid space bounded by a first housing, and to a filter device for binding foreign matter from an electrically insulating fluid arranged in the fluid space.

Such electrical insulation arrangement example ^¬, from European Patent EP 1273019 Bl be ^¬ known. There is described a high-voltage circuit breaker in free-air design, which has a porcelain body, which forms a main gas space. The porcelain body is closed with a porcelain body final dome-shaped closure fitting. By the porcelain body and the closure fitting, a fluid space is limited, which is filled with a gas. Within the local fluid space so-called filter bags are arranged, which serve a filtering of foreign matter from the disposed within the fluid space gas. In order to withstand the temperatures occurring in the fluid space, the filter bags are equipped with a high-temperature-resistant fabric. As a result, the known filter bag can only be provided at an increased cost. In addition, a change of the known filter bag appears laborious, since disassembly of the high-voltage circuit breaker must be carried out in open-air design and thus longer downtime of the known high-voltage circuit breaker are to be expected. Thus, it is an object of the invention to develop an electrical insulation arrangement such that these provide a has improved availability and downtime, in particular ^{¬ are} reduced in the maintenance case.

This is achieved according to the invention in an electrical insulation arrangement of the type mentioned above in that the filter device has a second housing, which is connected via a fluid channel with the first housing.

An electrical insulation arrangement serves for an electrically insulated arrangement of devices which lead to different electrical potentials. Typically, an electrical insulation arrangement is an electrically isolated arrangement of an electrically conductive phase conductor, which is surrounded with an electrical insulation to avoid flashovers to the or from the phase conductor. For example, an electrical insulation can be formed by an electrically insulating fluid, which flows around the phase conductor to be electrically insulated. To avoid a volatilization of the electrically insulating fluid, this can be ^¬ arranged for example within a fluid cavity, the fluid space by at least one

Housing assembly is limited. The housing assembly can be ^¬ vorzugt have a corresponding fluid-tight barrier (z. B. Wan ^¬ formation). Preferably, the electrically insulating fluid may be in gaseous form. However, it can also be provided that the electrical insulating fluid is liquid before ^¬ . Depending on requirements, the degree of fluid tightness of the housing assembly can vary. The housing assembly may act at least partially electrically insulating, but it can also be provided that the

Housing assembly is at least partially electrically conductive. Preferably, the electrically insulating phase conductor may be spaced from the housing assembly to be ge ^¬ hold. Such a spacing can be carried out for example by an electrically insulated mechanical support of Pha ^¬ senleiters to the housing assembly. The phase conductor can also rest on the housing assembly or pass through it. put. For this purpose, a corresponding electrically insulated design of the housing assembly should be present in this area. A distance between the phase conductor to be insulated as well as the housing assembly may be filled with the electrically insulating fluid, so that an electrical insulation zwi ^¬ 's phase conductor and the housing assembly is given by means of the electrically insulating fluid. The electrically insulating fluid flows around the phase conductor. To receive the electrical ^¬ specific insulation resistance of the electrically insulating fluid upright, the electrically insulating fluid may be in contact with a filter device. Via the filter device, it is possible to bind foreign substances, which can accumulate in the electrically insulating fluid. Such foreign substances may be, for example, dusts, foreign gases, foreign liquids, etc. In order to enable the filter device to become effective, the electrically insulating fluid must be passed through the filter device or fed to the filter device. Preferably, the filter device itself can limit a part of the fluid space. The housing assembly may include, for example, a first housing and a second housing. Preferred in this context may include a second housing, the Fil ^¬ tereinrichtung so that the fluid chamber from both the first and the second housing defines (fluid-tight barrier) is. In this case, both the first housing and the second housing can have a corresponding housing

Provide fluid-tight barrier to prevent passage of the fluid through one of the housing. In order to enable a correspondence of the electrically insulating fluid between the first and the second housing, the first and the second housing can be connected to one another via a fluid channel. In order to avoid volatilization of the electrically insulating fluid, the fluid channel is preferably likewise provided with a fluid-tight wall or fluid-tight barrier, so that an overflow of an electrically insulating fluid can take place from the first housing to the second housing and vice versa via the channel , The use of a first and a second housing he ^¬ makes it possible to force an inflow or flow of the filter device from a defined direction. Thus, the filter device can be improved in terms of their filtering effect. Compared to a diffuse flow or flow of a filter device so for example, a multi-stage filtering of foreign substances can be made. It can further be provided that the first housing at least partially surrounds the second housing. By the second housing in the fluid chamber, a defined range (eg. B. Part), for example, a filter substrate of the filter device can be provided within which may be ^¬ arranged. Thus, the second housing can also perform a mechanical protective function in addition to a mechanical Elnhausen a foreign matter-binding filter substrate, so that the substrate is protected, for example, from burning, premature aging, disintegration, etc. A fluid channel can be formed, for example, in the form of a pipe or a passage opening, via which a communication of a first portion of the fluid space, which is at least partially bounded by the first housing, and a second portion of the fluid space, which is at least partially limited by the second housing, made possible ^¬ light is. The axial extent of the fluid channel should preferably be larger (preferably a multiple) than the extent of the fluid channel in a transverse direction. Such a dimensioning allows the filter device to flow through with a specific acceleration profile, so that a promotion of the filter effect and / or filter performance of the filter device can take place.

A further advantageous embodiment can provide that a shut-off device is arranged in the fluid channel. The use of a shut-off device allows the

Permeability of the fluid channel to limit the fluid. For example, the flow resistance of the fluid channel can be changed by means of a shut-off device. The flow resistance can be increased, for example, such that no flow through the fluid channel is possible. In this case, the fluid channel is closed. Thus, by means of the shut-off device fluid in the first section of the fluid space and fluid in the second section of the fluid space can be separated from each other. Here, the ers ^¬ th partial portion of the first housing and the second section of the second housing respectively, at least from ^¬ cut sometimes limited. By means of the shut-off device, a shut-off of the filter device is made possible by the first housing, so that a treatment of the fluid in the first

Subsection and / or the fluid in the second section can be made independently of the fluid in the other part. Thus, it is possible, for example, to make a maintenance of the filter device after a successful locking of the fluid channel, wherein the partial section, which is bounded by the first housing, remains unaffected due to the Ab ^¬ blocking by the shut-off device. The shut-off device can be controlled manually or automatically. Thus, it can be provided, for example, that contamination of or saturation of the filter device is detected during monitoring of the fluid, whereupon shut-off or at least partial damaging of the fluid channel can be triggered. If necessary, such an actuation of the shut-off device can also be carried out manually.

A further advantageous embodiment may provide that the filter device is angeord ^¬ net outside the first housing.

An arrangement of the filter device outside the first housing has the advantage that the filter device at For example, independently of the first housing, ie without intervention in the interior of the first housing, serviced, exchanged ^¬ , processed, treated, etc. can be. Example ^¬ as there is the possibility of connecting several housing of an electrical isolation arrangement to a fluid chamber and to provide a central arrangement of one or more filter devices. In particular, in the case of relatively large electrical insulation arrangements, it is thus possible to filter a filter device which filters a fluid of an insulating space delimited by a plurality of (first) housings or also several filter inlet ^devices which in each case filter fluids from separate housings. This facilitates monitoring or maintenance of the filter device (s).

In addition, due to a separate arrangement of the filter device outside of the first housing, a removal or processing, for example, a two ^¬ th housing can be made without the first housing edit or treat.

A further advantageous embodiment may provide that at least one of the housing is a pressure vessel. An embodiment of at least one of the housing, in particular of the first and the second housing, preferably also a pressure-resistant design of the fluid channel, allows a differential pressure between the limited by the first housing or the second housing or the fluid channel fluid space and the environment of the first and second housing or the fluid channel herzustel ^¬ len. Thereby, the possibility is given to put the fluid in the perception ^¬ ren the fluid space under an overpressure, wherein the housing, in particular the first and second particular the fluid passage, a fluid-tight, pressure-tight barrier represented. Thus, it is possible, for example, the insulation ^¬ strength of the electrically insulating fluid by printer increase in the interior of the fluid space. For example, a fluid insulation can be formed in gaseous form, wherein the gaseous fluid has an overpressure of several atmospheres. As the electrically insulating fluid (regardless of the pressure thereof), in particular fluoride-containing fluids such as sulfur hexafluoride, fluoroketones or Fluornitri ^¬ te, which have a high dielectric strength and further also have arc-quenching properties are suitable. However, other fluids, such as nitrogen, carbon dioxide, insulating oils, Isolierester can find, etc. Ver ^¬ application beyond.

A further advantageous embodiment can provide that the shut-off device has a first valve.

Equipping a shut-off with a valve makes it possible to specifically block the fluid channel Bezie ^¬ hung as to increase its flow resistance. By means of the valve, for example, a damming of the cross section of the fluid channel can be made. Furthermore, a valve allows repeated opening and closing. Depending On the ^¬ staltung the first valve that can automatically, play as a differential pressure at ^¬, taxed away, tempera ^¬ turgesteuert etc. work. It can be a one-way valve, but it can also be a multi-way valve.

A further advantageous embodiment can provide that the shut-off device has a first valve and a second valve.

The use of a first valve and a second valve makes it possible to divide the fluid passage into different from ^¬ sections, so that for example input side, and output side of the fluid channel or vice ^¬ versa a first or a second valve are angeord ^¬ net, so that between the valves a section in the Fluid channel is formed, which can be separated from the partial volume of the ers ^¬ th housing and of the partial volume of the second housing. Advantageously, the two valves can have opposite directions of passage, so that, in particular in the case of differential-pressure-controlled valves, an opposite action of the valves takes place. Likewise, relative movements of valve bodies of the respective valves with reversed directional sense can also take place in a path-dependent control.

A further embodiment can provide that a Actuate the ^¬ supply the first valve and the second valve each hire be ^¬. The two valves can preferably only depending on a particular state of the other valve actuated ^¬ who, so that an actuation of a valve actuation ^¬ tion of the other valve conditionally or which is due to the actuation of a valve actuation of the other valve , Thus, for example, sicherge ^¬ assumed that a nearly simultaneous actuation of the first and second valve takes place or it can also be sicherge ^¬ represents that actuation of the two valves is triggered as a function of the progress of operation of the other valve.

Advantageously, can further be provided that the locking device from ^¬ has a self-locking connector.

A connector makes it possible to separate the fluid space, in particular in the region of the fluid channel, in order to be able to mechanically separate the first section from the second section. By means of a self-locking connector can be ensured that at a

Separating the fluid space, an unintentional escape of electrically insulating fluid is reduced. Thus, For example, a replacement of the filter device done without having to make an intervention in the inside of the first housing be ^¬ sensitive fluid. Instead, the self-locking plug connector makes it possible to connect or disconnect the filter device. The self-locking connector may for example have a valve which closes upon release of the connector, that dammed the fluid channel. Further, a second valve can be released from ^¬ by a separation of the filter means also causes an obstruction of the fluid channel. Thus, an area located between the two valves, in particular of the fluid channel, can be separated from the first housing or from the second housing (or first sections of the fluid space and second sections of the fluid space).

A further advantageous embodiment can provide that at the fluid chamber, a service port for the second housing is arranged to ^¬ .

A provision of a service port on the fluid space made ^¬ light to fill fluid into the fluid chamber or drain fluid from this space. By arranging the maintenance connection in the region of the second housing, ie in the region of the filter device, it is possible to pre-fill the filter device, for example, before coupling to the first housing or remove residues from the first housing before opening the filter device. Thus, an insulating fluid can be used to pre-fill the first housing. When removing, for example, insulating fluid and foreign matter can be removed from the filter device.

This prevents the fluid from being contaminated within the fluid space by connecting a filter device in the undefined state. Conversely, contamination of the environment by Device emerging fluid or foreign matter counteracted by previous draining.

A further advantageous embodiment can provide that the filter device comprises a filter substrate receiving Kartu ^¬ cal.

A filter substrate in a filter device serves to bind foreign matter contained in the insulating fluid. For example, oxides are suitable as the filter substrate

Alumina, for. B. Filter out moisture from the electrically iso ^¬ lierenden fluid and keep in the filter substrate. In this case, the filter substrate various types

Have structures. For example, the filter material may be granular, mat-shaped, gaseous, etc. By using a cartridge, it is possible to introduce normalized filter substrates into the cartridge and to make a suitable flow through the filter substrate. The cartridge can advantageously form part of the second housing. For example, the cartridge can be screwed on a bottom plate in the manner of a bell, so that access to the inner volume of the bell after separation from the bottom plate is made possible. Thus, the Mög ^¬ friendliness is given to use the filter device several times and regularly replace the filter substrate and regenerate gegebe ^¬ if appropriate. The cartridge can act as a fluid-tight barrier and as part of a pressure vessel (e.g.

second housing) serve. Another object of the invention is to provide a method of servicing an electrical insulation assembly having an electrically insulating fluid disposed within a fluid space and a filter device for binding foreign matter from the electrically insulating fluid disposed in the fluid space. Advantageously, the process should it allow for easy and quick maintenance of Fil ^¬ tereinrichtung. Advantageously, the object is achieved in a method of the above type in that before opening the filter device, the fluid space is divided into a first section and a second section.

A subdivision of the fluid space into a first section and a second section can preferably be carried out with ^¬ means of a shut-off. The shut-off device should preferably act on a fluid channel having a first housing and a second housing Ge ^¬ which together define a fluid chamber. By subdividing the fluid space into a first and a second subsection, the electrically insulating fluid located in the interior of the fluid chamber can likewise be subdivided into a first subvolume and a second subvolume. Depending on the size of the separated sections, it is now possible, with a wait or before opening the filter device, to provide only a smaller section in the filter device. As a result, the larger portion of the electrically insulating fluid is not affected by maintenance of the filter device. A further advantageous embodiment can provide that before opening the filter device, a medium located in the filter device is removed.

Before the filter device is opened, ie before it has access to the subsection bounded by the filter device, the (in particular fluid) medium located in the filter device can be removed. For this purpose, it may be provided that a corresponding service connection is used to z. B. to remove the inside of the filter device electrically insulating fluid or impurity from the filter device to prevent an undefined letting out. For this purpose, a connection of the filter device to a so-called maintenance device carried out with ^{¬ means of} which a suction of the fluid together with foreign substance suc ^¬ gene can. In addition to the use of a separate service port and a split fluid channel can be used to dissipate or suck an electrically insulating fluid or foreign matter from the interior of the filter device. For this purpose, after a successful connection of the fluid channel to a collecting volume, a shut-off device used for damaging the fluid channel can be opened.

The filter substrate is vented before removal from the filter device ^¬ direction and volatile media are let out of the filter device in advance. Accordingly, the remaining filter substrate can be removed after opening the filter device and regenerated if necessary.

A further advantageous embodiment can provide that, before the filter device flows through the electrically insulating fluid, a medium located in the filter device is removed.

Removal of a medium located in the filter device before flowing through the filter device with the electrically insulating fluid is advantageous, in particular after a successful maintenance of the filter device, in particular after replacement of the filter substrate. Thus, it is possible to prevent an impurity (for example moisture or foreign gases) located inside the filter device from being introduced into the fluid space even before the filter device is connected to the first housing. Before Trains t ^¬ removal by means of a negative pressure insbesonde re ^¬ a vacuum can be carried out, so that subsequently a filling with the electrically insulating fluid may be made. This filling can be done, for example, when opening a fluid channel after connecting the sections of the first and the second housing, so that the fluid through the fluid channel into the filter device overflows. However, it can also be provided that before opening the shut-off device after removal of an undefined medium in the filter device, an additional filling of the filter device with the electrically insulating fluid is performed and only after filling the filter device via the fluid channel after opening a shut-off device an exchange of the electrically insulating fluid between the first housing and the second housing can take place.

For example, a service connection to the second housing can be used to remove the undefined medium from the filter device or a subsequent pre-filling of the filter device with the electrically insulating fluid. However, it can also be provided that the

Fluid channel itself configured accordingly, z. B. mecha ^¬ African is separable to a removal of an undefined medium from the filter device or a

Prefilling the filter device to make with electrically insulating fluid.

In the following an embodiment of the invention is shown schematically in a drawing and described in more detail below.

The show

1 shows a cross section through an electrical Iso ^¬ lationsanordnung,

FIG. 2 shows a cross section through a filter device together with a fluid channel,

FIG. 3 shows an external view of the arrangement known from FIG. 3 in a variant. FIG. 1 shows a cross section through an electrical insulation arrangement with a housing assembly. The

Housing group has a first housing 1 in a first Va ^¬ variant, a first housing 2 in a second variant and a first housing 3 in a third variant. The ers ^¬ th housing 1, 2, 3 are respectively carried out essentially tubular and have a circular cross-section. The first housing 1, 2, 3 are each aligned coaxially to a rotation axis 4. The first housing 1, 2, 3 are provided at their front ends each with an outer flange, so that the end faces of two adjacent housing 1, 2 & 2, 3 with the interposition of a respective solid ^¬ material insulator 5 can be flanged together. In this case, the flanges can preferably be designed as screw flanges which each have recesses in their flange collars, by means of which pins can be plugged substantially aligned with the axis of rotation 4, which has a clamping force on the flanges of the first housings 1, 2, 3 ^{¬ can} bring. The solid insulators 5 are substantially circular-cylindrical, wherein the outer diameter substantially corresponds to the cross-section of the flanges on the first housings 1, 2, 3. Thus, it is possible to use the solid ^¬ material insulators 5 frontally in the flange connection between the first housings 1, 2, 3, so that, for example, a fluid-tight barrier each frontally to the first housings 1, 2, 3 is created. The solid insulators 5 are centrally penetrated by a phase conductor 6. In the present case, the phase conductor 6 is designed as a metallic conductor which is inserted in a fluid-tight manner into the solid insulators 5 and is held at a distance from the solid insulators 5 to the first housings 1, 2, 3. By way of example, in the first variant of the first housing 1, the arrangement of a measuring transducer 7 is shown, by means of which a current flow through the phase conductor 6 can be detected. Further, the voltage Anord ^¬ an interrupter unit 8 is by way of example provided in the first housing 2 to the second variant, by means of which the phase conductors 6 interruptible or closeable is. The interrupter unit 8 may be, for example, the sub ^¬ breaker unit of a circuit breaker or a disconnector ^¬ switch or a load switch or other switching device. In addition to an interrupter unit 8 in the course of the phase conductor 6 can also be provided that a further switching device, such as a grounding ^¬ switch, within a first housing 1, 2, 3 is arranged, which can make, for example, a grounding of the phase conductor 6. The first housing 1, 2, 3 can lead ground potential to, for example, of an electrically conductive material, can be manufactured at ^¬ game as a metal, and in turn, for safety reasons, so that by means of a grounding switch, for example, a transfer of the Erdpo ^¬ tentials one of the first housing 1, 2, 3 can be made on the phase conductor 6.

In the third variant of the first housing 3, a passive design of so-called ^¬ is selected, that is, in the first housing 3 of the third variant of the phase conductor is disposed only 6, wherein it is held electrically isolated.

Switching devices or other installations are not provided on the first housing 3 in the third variant.

Each of the first housings 1, 2, 3 has a connecting piece 9a, 9b, 9c. The connecting pieces 9a, 9b, 9c are each of a similar design and are applied on the shell side to the respective first housing 1, 2, 3. Each of the first housings 1, 2, 3 defines in each case a fluid space 10a, 10b, 10c. The fluid spaces 10a, 10b, 10c are each provided with an electrically insulating fluid, preferably a gas, for. As sulfur hexafluoride, fluoronitrile or a fluoroketone, nitrogen, C02 or otherwise suitable electrically insulating fluid filled. The first housing 1, 2, 3 are each formed as a pressure vessel to evacuate the fluid intake in their 10a, 10b, 10c to be able to pressurize fluid in each case located under excess pressure ^¬. In the fluid space 10b of the first housing 2 in the second variant, the fluid is adjacent to one electrical insulation of the phase conductor 6 and a deletion of an optionally resulting on the interrupter unit 8 ^¬ the switching arc. Via the connecting pieces 9a, 9b, 9c, a mouth of a fluid channel IIa, IIb, 11c created by means of which a fluid-tight connection between the interior of a respective first housing 1, 2, 3 and the interior of a respective second housing 12, 13, 14 created is. The respective first housing 1, 2, 3 and each of the respective

Fluid channel IIa, IIb, 11c connected second housing 12, 13, 14 each define a fluid chamber 10a, 10b, 10c, wherein a first portion of the respective fluid space 10a, 10b, 10c through the respective first housing 1, 2, 3 and a second portion of the fluid space 10a, 10b, 10c by the respec ^¬ ge second housing 12, 13, 14 is limited. The respective second housing 12, 13, 14 is arranged outside the respective first housing 1, 2, 3. In the course of the respective fluid channel IIa, IIb, 11c is a shut-off device 15a, 15b, 15c is arranged depending ^¬ weils. The shut-off devices 15a, 15b, 15c are, for example, Venti ^¬ le, which are used as required, a tamping of the respective fluid channel ^¬ IIa, IIb, 11c. Via the respective Absperrein- direction 15a, 15b, 15c, a dividing and separating in a first portion and a second portion of the fluid chamber 10a, 10b, 10c located electrically isolie ^¬ leaders fluid is possible. Furthermore, the respective second housing 12, 13, 14 is assigned a respective service port 16. By means of War ^¬ processing terminal 16, it is possible for a blocking of the respective fluid channel IIa, IIb, 11c let out or ERS means of the respective shut-off device 15a, 15b, 15c within the second device covers 12, 13, 14 remaining electrically insulating fluid or impurity ^¬ suck. When the locking device 15a, 15b, 15c is open a is Filling / emptying of the first housing 1, 2, 3 on the maintenance 16 possible. For this purpose, the service port 16 is provided with a corresponding valve. In the fluid channel IIa of the first housing 1 in the first variant, it is provided that a plurality of separate second housings 12, 13 are used, which achieve an increase in the capacity of the filter device. In this case, it is provided that a service port 16 for all second housing 12, 13 of the filter device can be used. To increase the capacity of the filter device, provision can be made for using additional second housings 12, 13, which in turn can be emptied / filled via the service connection 16 of the filter device of the fluid space bounded by the first housing 1 in the first variant.

In the further course Moreover, other valves between the individual second housings 12, 13 may be provided or a plurality of service ports 16, in each case in ^¬ dividual the respective second housing to be able to deflate 13 12th

Inside the respective second housing 12, 13, 14, a filter substrate 17 is arranged. The filter substrate 17 is disposed in front ^¬ lying as granules inside the second housing 12, 13, 14th In addition to providing a plurality of second housing 12, 13 or exactly one housing 12 for a first housing 1, 2, 3 can also be provided that a second housing 14 with a plurality of first housings 2, 3 cooperates. In this case, a respective shut-off device 15b, 15c is assigned to each of the first housings 2, 3, each of which is capable of closing a fluid channel IIb, 11c. The fluid channels IIb, 11c of the first housing 2 in the second variant and of the first housing 3 in a third variant open into a common second housing 14. Since the fluid channels IIb, 11c open into a common second housing 14, there is the possibility of this second one Housing 14 over a single War 16 venting or venting kön ^¬ nen.

In the following, a filling or waiting of a second housing 12, 13, 14 having filter device will be described.

Before filling the first housing 1, 2, 3, this can be evacuated to prevent contamination of an electrically insulating fluid to be filled. Such an evacuation can take place via the service connection 16, with an open shut-off device 15a, 15b, 15c sucking off a medium located inside the respective first housing 1, 2, 3 and medium located inside the respective second housing 12, 13, 14 can be made. With the achievement of a sufficient negative pressure, ie with a sufficient evacuation, it is now possible, via the service port 16, an electrically insulating fluid in the first housing 1, 2, 3 and the second housing 12, 13, 14 fill. For this purpose, the fluid channel IIa, IIb, 11c can be released by means of the shut-off device 15a, 15b, 15c, so that an electrically insulating fluid flowing in via the service port 16 becomes uniform in the interior of the first housing 1, 2, 3 or the second housing 12 , 13, 14 together with Fluidka ^¬ IIal IIa, IIb, 11c distributed.

In the case of a necessary renewal of the filter substrate 17 in the interior of the second housing 12, 13, 14, it is initially possible to lock the shut-off device 15a, 15b, 15c. Subsequently, a Entneh ^¬ men of the remaining within the second housing 12, 13, 14 fluid can be carried out together with optionally contained in this fluid impurity via the maintenance port. Subsequently, an opening of the second housing 12, 13, 14 of the filter device can be made and the filter substrate 17 removed and replaced. After the replacement of the filter substrate 17, the second housing 12, 13, 14 are in turn connected to the fluid channel IIa, IIb, 11c. It is now possible, the interior of the second housing 12 to evacuate 13, 14 via the maintenance instructions circuit 16 in order to, remove located there impurity or an undefined medium, such as a fluid, and to achieve a negative pressure or a Evakuie ^¬ tion. Upon reaching a sufficient negative pressure in the interior of the second housing 12, 13, 14 of the maintenance port 16 can be closed and then the shut-off 15a, 15b, 15c are opened, so that the previously within the first housing 1, 2, 3 shut off electrically insulating fluid via the fluid channel IIa, IIb, 11c in the second housing 12, 13, 14 can flow. Be ^¬ may be done before opening the shut-off device 15a, 15b, 15c via the service port 16 after a preferably previously done evacuation of the second housing 12, 13, 14, a pre-filling with the electrically insulating fluid. This counteracts a reduction in the density of the fluid in the interior of the fluid accommodating space 10a, 10b, 10c.

FIG. 2 shows a detail of a fluid channel Id with an alternative embodiment of a shut-off device. As an alternative to the fluid channels IIa, IIb, 11c shown in FIG. 1, the fluid channel 11d can be flanged to the connecting pieces 9a, 9b, 9c there. The fluid channel lld in this case has a connector 18, wel ^¬ cher is connected to a second housing 15. The connector 18 has in its interior a first valve 19 with a valve body 20. The valve body 20 of the first

Valve 19 is mounted axially movable, said spring ^¬ is pressed against a mouth opening 21 of the connector 18. In a counterpart connector 22 is also a valve body 23, which is preferably constructed identical to the valve body 20 of the first valve 19 is arranged. The valve body 23 serves to seal an orifice 24 of the opposite connector. ders 22. The two valve bodies 20, 23 abut in the assembled state of the connectors 18, 22 to each other such that the valve body 20, 23 are pressed out of their sealing seat of the respective mouth opening 21, 24. This state is shown in FIG. Ie. the closure device lld, which has a first valve 19 and a second valve 19a, is opened, so that the fluid channel lld allows a correspondence of the fluid enclosed by the second housing 15 and a first housing 1, 2, 3. To a desired release of the connectors 18, 22, for example, driven by the spring load of the valve body 20,

23 or a possibly existing inside nen ^¬ overpressure to prevent a fuse cover 25 is above the junction of the connector 18, 22 arranged net. To effect a release of the connectors 18, 22, the fuse cover 25 must be unlocked, so that in the axial direction, the connector 18, 22 can be removed from each other. As a result, the distance of the spring-loaded valve body 20, 23 is increased, whereby the valve body 20, 23 spring-loaded sealing in the respective mouth opening 21,

24 are pressed. The valve body 20, 23 are operated Wegge ^¬ controls. In order during the transition from a Publ ^¬ voltage position of the two valves 19, (or vice versa as well as) to prevent 19a in a Sperrpositi ^¬ on leakage of electrically isolieren- the fluid, the outlet openings 21, 24 provided with collars 26a, 26b which foreign relationship ^¬ example 27 are sealed from each other inside the casing side of a sealing lip, so that up to a final sealing of the mouth openings 21, 24 by means of the respective valve body 20, 23 an escape of an electrically insulating fluid from which auftrennenden fluid channel IIb is limited. After closing the mouth openings 21, 24 by the valve bodies 20, 23, the overlapping of the collars 26a, 26b and the sealing effect of the sealing lip 27 can be canceled. Accordingly, only one to vernachlässi ^¬ gender proportion of electrically insulating fluid which is in an annular gap between the collar 26a, 26b optionally collected recorded.

Now the second housing 15 is closed. Furthermore, the second housing 1, 2, 3 is also closed. The fluid channel lld is separated. The filter device with the second housing 15 can be removed, wherein in the interior of the second housing 15 next to the filter substrate 17 electrically insulating fluid is located. Via the second valve 19a with the valve body 23 is now a way gegebe ^¬ nen, if necessary, to empty the interior of the housing 15. For this purpose, actuation of the first valve 19 can take place after / at a connection to a collecting container. In order to replace the filter substrate 17 located inside the second housing 15, the cartridge-shaped housing 15 can be unscrewed from a screw base 28. The filtrate ^¬ tersubstrat 17 can be replaced, and then the second housing 15 may be sealingly inserted in the screw 28 again. In this case, the screw base 28 surrounds the second housing 15 on the outer shell side, so that a sealing effect can additionally be supported by an overpressure of a fluid located in the interior of the second housing. Before a RETRY ^¬ th Ansetzten of the second housing 15 to the connector

18, the second housing 15 may optionally be evacuated and, if necessary, prefilled with an electrically insulating fluid. This in turn can be done via the first valve

19 done.

When the connectors are connected, the reversal now takes place in dependence on the connection of the two

Connectors 18, 22 a path-controlled actuation of the valve body 20, 23, so that in turn the fluid channel Lld Herge ^¬ provides and is opened and an electrically insulating fluid within a fluid chamber 10 a, 10 b, 10 c, which of a first housing 1, 2, 3 and a second housing 12, 13, 14, 15 is limited, can flow. By means of the Sicherungsüberwurfs 25 can secure the plug connection against the spring force of the respective valve body 20, 23 and against an optionally inside the second housing 15 or in the interior of the first Ge ^¬ housing 1, 2, 3 respectively within the fluid channel 11 herr ^¬ shear fluid pressure be secured.

3 shows an external view of from the figure 2 be ^¬ known construction in a variant, in which there is proposed the use of a casing 29 for allowing a variable arrangement of a second housing 15th The piping 29 may be formed, for example, flexible or angularly rigid. By means of the piping 29, the position of the second housing 15 spaced from a connection piece 9a, 9b, 9c of a first housing 1, 2, 3 are made.

Claims

claims An electrical insulation arrangement comprising a fluid space delimited by a first housing (1, 2, 3) and a filter device for binding foreign matter from an electrically insulating fluid (10a, 10b, 10c) arranged in the fluid space, d a d u r c h e c e n c i n e s that the filter device has a second housing (12, 13, 14, 15) which is connected to the first housing (1, 2, 3) via a fluid channel (IIa, IIb, 11c, 11d). 2. Arrangement according to claim 1, d a d u r c h e c e n c i n e s that in the fluid channel (IIa, IIb, 11c, lld) a Absperreinrich ^¬ device is arranged. 3. Arrangement according to claim 1 or 2, d a d u r c h e c e n c i n e s that the filter device is arranged outside the first housing (1, 2, 3). 4. Arrangement according to one of claims 1 to 3, d a d u r c h e c e n c i n e s that at least one of the housings (1, 2, 3, 12, 13, 14, 15) is a pressure vessel. 5. Arrangement according to one of claims 2 to 4, d a d u r c h e c e n c i n e s that the shut-off device (15a, 15b, 15c) includes a first valve on ^¬. 6. Arrangement according to claims 5, d a d u r c h e c e n c i n e s that the shut-off device (15a, 15b, 15c) has a first valve and a second valve. 7. Arrangement according to claim 6, d a d u r c h e c e n c i n e s that an actuation of the first valve and the second valve condition each other. 8. Arrangement according to one of claims 2 to 7, d a d u r c h e c e n c i n e s that the shut-off device (15a, 15b, 15c) has a self-locking connector. 9. Arrangement according to one of claims 1 to 8, d a d u r c h e c e n c i n e s that a service port (16) for the second hous ^¬ se is arranged on the fluid space. 10. Arrangement according to one of claims 1 to 9, d a d u r c h e c e n c i n e s that the filter device has a filter substrate (17) receiving cartridge. 11. A method for maintenance of an electrical isolation arrangement that a valve disposed within a fluid cavity electrically insulating fluid (10a, 10b, 10c) and a Fil ^¬ tereinrichtung for bonding of foreign material from the disposed in the fluid chamber electrically insulating fluid (10a, 10b, 10c) . d a d u r c h e c e n c i n e s that before opening the filter device, the fluid space is subdivided into a first subsection and a second subsection. 12. A method of servicing an electrical insulation arrangement according to claim 11, d a d u r c h e c e n c i n e s that before opening the filter device, a medium located in the filter device is removed. 13. A method for servicing an electrical insulation arrangement according to claim 11 or 12, d a d u r c h e c e n c i n e s that before flowing through the filter device with the electrically insulating fluid (10a, 10b, 10c), a medium located in the filter device is removed.