WO2008135484A1

WO2008135484A1 - Pressure relief device for a gas-insulated switchgear

Info

Publication number: WO2008135484A1
Application number: PCT/EP2008/055316
Authority: WO
Inventors: Andreas Kloos
Original assignee: Siemens Aktiengesellschaft
Priority date: 2007-05-08
Filing date: 2008-04-30
Publication date: 2008-11-13
Also published as: DE102007022465A1

Abstract

The arrangement comprises an encapsulated housing (1, 2, 3; 6, 7, 8, 9, 10). The encapsulated housing (1, 2, 3; 6, 7, 8, 9, 10) is provided with a pressure safety device (4a, 4b, 4c) allowing for a pressure compensation. A channel (5a, 5b, 5c; 6a, 7a, 8a, 9a, 10a) located between a first volume and a storage housing (6, 6a) can be actuated by means of the pressure safety device (4a, 4b, 4c). Media escaping from the encapsulated housing (1, 2, 3; 6, 7, 8, 9, 10) can be caught in the storage housing (6, 6a) when the pressure safety device (4a, 4b, 4c) is actuated.

Description

description

PRESSURE RELIEF OF A GAS INSULATED SWITCH

The invention relates to an arrangement with an encapsulating housing, which surrounds a first volume and has a pressure compensation device enabling pressure equalization.

Such an arrangement is known for example from the Schweize ^¬ step Patent CH 695 647 A5. There, an encapsulating housing is described, which is filled with an insulating gas. As a pressure relief device there is provided a bursting element. When an overpressure arises, pressure equalization is brought about by means of the pressure-securing device. The first volume of the encapsulating housing is connected to an environment of the encapsulating housing.

After a successful escape of the insulating gas into the environment, the insulating gas is lost. Thus, to complain a wirtschaftli ^¬ cher loss. Depending on the insulating gas and a deterioration of the environment is possible.

Thus, it is an object of the invention to provide an arrangement of the type mentioned, which can be operated more economically and is designed environmentally friendly.

According to the invention this is achieved in an arrangement of the type mentioned above, that by means of Drucksiche ^¬ tion device extending between the first volume and a memory housing channel is switchable. The use of a storage enclosure allows unkontrol ^¬ profiled volatilization of media to prevent. Across the channel the encapsulating is a storage enclosures verbun ^¬. In this case, the connection is designed such that a sufficient seal for an originally inside the

Enclosed housing encapsulated medium is guaranteed.

For switching the channel, a pressure-securing device of the known type can be used. Thus, it is possible to retrofit an inventive arrangement also on existing Kapse ^¬ ment housing. It is advantageous that does not need to be intervened in the internal structures of the encapsulating itself. Thus, existing designs can be maintained. These are only with regard to the training and the connection of channel and

Adapt the storage enclosure accordingly. As a storage housing, for example, trough-shaped recesses can be used, in which the fluid is introduced. The Speicherge ^¬ housing may be integrated into foundations, for example in the form of a double bottom, for example. When using media which are heavier than the capsule housing umge ^¬ bende medium, trough-like recesses are sufficient as Speicherge ^¬ housing. The storage housing can advantageously be sealed by incorporation of paints when integrated into structures.

A further advantageous embodiment can provide that the pressure-securing device is an overpressure safety device of the encapsulating housing.

Within the encapsulating housing media are generally included, which are separated from the environment of the encapsulating. Technologically, the medium often has a deviating from the environment pressure. Kapse- lung housing are only up to a certain Bemes ^¬ sungswert withstand capable of pressure differences between the first volume and the exterior of the encapsulating housing. In the event of overpressures, either in the first volume of the encapsulating housing or outside of the encapsulating housing, a pressure relief device may allow overflow of media. Pressure relief devices are, for example rupture discs or valves. Since, with the provision of a storage housing, a medium flowing out of the first volume of the encapsulating housing can be collected, in the case of encapsulating housings it can now be provided to reduce its pressure resistance and instead allow the pressure-assurance device to respond more frequently. Thus, it is possible to re- the cost of materials for an arrangement such as duce no longer rarer extreme ^¬ conditions must be designed. After a response of the pressure-securing device, the medium collected in the storage volume can be reused.

Advantageously, it can further be provided that within the first volume at least one electrically active element is arranged, which is electrically insulated from the housing Encapsulation ^¬ .

Electrically active elements are, for example, electrical conductor tracks which serve for the transmission of electrical energy or data. These are to be electrically insulated from adjacent modules. For this purpose, it may be provided that solid insulation space the electrically active elements of the encapsulating. In addition, the interior of the encapsulating housing may be filled with a fluid. Particularly in the case of medium, high and very high voltage installations, which serve for the transmission of electrical energy, a contact-proof structure is created by the encapsulating housing, so that unintended touching of electrically active elements is almost impossible. In a corresponding embodiment of the encapsulating of an electrically conductive material, this can be additionally applied to earth potential, so that a touch of the outer surfaces of the encapsulating, for example by operating ^¬ staff, is safe.

Furthermore, the impingement of the encapsulating ground potential is advantageous that can occur when A ^¬ provide electrical faults, for example, on an electrically active element, forming a leakage path and thus enables a reliable response of protective devices.

Furthermore, it can be advantageously provided that a fluid under elevated pressure is arranged within the first volume.

Is a work in the first volume of fluid with a ^¬ he increased pressure applied, it is possible to change the physi ^¬ rule properties of the fluid. Thus, for example, be provided to arrange an insulating gas in the first volume, which is acted upon by an increased pressure, so that the electrical breakdown strength of Iso ^¬ liergases is improved. Thus, it is advantageously possible to isolate located in the interior of the encapsulating electrically akti ^¬ ve elements and to reduce the necessary for isolation strike distances. So you can embellish as electrical switchgear or electrical switchgear in ei ^¬ ner compact form. It can be provided that a plurality of encapsulating housings are connected to each other, wherein in the interior of the encapsulating housing according to specifications of an electrical circuit diagram different electrically active EIe- such as busbars, circuit breakers, disconnectors, earthing switches, measuring equipment for measuring electrical variables such as voltage or current transformers, etc. are arranged. Thus, it is possible to form trainees example, switching stations that have multiple inputs and outputs, dome-wel ^¬ che in different ways with each other or are comparable switchable.

Furthermore, it can be advantageously provided that the pressure-securing device is a bursting element.

Bursting elements are available at low cost. They can be flange-mounted in a simple manner on flange openings of an encapsulating housing. They represent an encapsulation housing a predetermined breaking point, which is destroyed when exceeding ei ^¬ ner pressure difference. Bursting elements can be exchanged and replaced in a simple manner. Different At ^¬ response thresholds can be realized, depending on the characteristics of the bursting elements. Bursting elements have, for example, a circular cross-section, which is adapted in its dimensions to a flange of the encapsulating housing and can be fastened there. For attaching a abge ^¬ sealed channel of this flange can be used, so that the bursting element, for example, in the region of a Flanschver- connection between the channel and the encapsulating is ^¬ inserted. By this variant, the size of the Kapse ^¬ ment housing itself is hardly changed and a connection of the storage enclosure with the encapsulating via a channel can be easily made.

Furthermore, it can be advantageously provided that different volumes can be connected to the storage housing by means of different pressure-securing devices. Complex systems are often built up from a plurality of Kapse ^¬ lung housings which surround each different volumes. The volumes are separated from each other. As a rule, pressure-securing devices are arranged on the enclosing capsules associated with the volumes. However, it is also possible that a plurality of encapsulating enclosing a volume together. In such a case, it is only necessary that a Drucksi ^¬ cherungseinrichtung is arranged on one of these encapsulating. For example, switchgear are known which comprise a plurality of Kapselungsge ^¬ housings, whereby individual volumes of the Kapselungsge ^¬ housings are partly connected to each other and are partially isolated from each other ^¬.

Since it is unlikely that in all Kapselungsgehäusen the same time a response of pressure relief devices, it is advantageous to allow more open Kanae ^¬ le of different volumes in a common memory housing. Thus, a storage volume is given, which provides a sufficient volume available to aufzu flowing out of the respective volumes of media to take ^¬. Depending on an expected simultaneity factor of the response of individual pressure protection devices, the capacity of the storage housing can be designed to be more or less large.

Advantageously, it can be provided that the Speicherge ^¬ housing separates the fluid from a surrounding the encapsulating medium.

Separation represents a reliable partitioning of outflowing media. Thus, it is possible, for example, to use installations according to the invention also in potentially explosive environments, since even after occurrence of a critical see pressure difference and consequent response of a pressure relief device a closed vascular system is maintained. Opposite open memory housing, ^¬ at play as trough-shaped configurations, a gedichte- ter composite of encapsulating over the channel to the SpeI ^¬ chergehäuse the advantage that impurities of the aufzu ^¬ scavenging medium are prevented.

Another object of the invention is to provide a method of protecting an encapsulating housing from damage.

In this case, the inventive method provides that at He-rich ^¬ a pressure difference, a pressure relief device of the encapsulating housing a sealed connection between a first volume which is be ^¬ borders of the encapsulating housing, frees a storage enclosure.

A releasing a fluid-tight connection between the first volume of the encapsulating housing and the reservoir housing makes it possible reliably remove that the interior of the encapsulating housing befindli ^¬ surface delimited by the environment even after the medium attrac ^¬ chen a pressure relief device. This makes it possible, for example, to prevent dangerous substances from ^evaporating . Furthermore, there is thus a possibility of repeatedly using a medium flowing into the storage housing. Optionally, it may be provided that the medium is subjected to a further utilization of a treatment, for example, a cleaning process.

Furthermore, it can advantageously be provided that prevents volatilization of a fluid originally located inside the capsule housing after release of the compound, the encapsulating housing and the storage medium ^¬ chergehäuse. Volatilization can be prevented, for example, by providing a vascular system after release of the channel, which is hermetically sealed against environmental influences. So even after a response is a

Pressure assurance device given a closed system.

In the following, an embodiment of the invention is sche ^¬ matically shown in figures and described in more detail below.

It shows the

Figure 1 shows an arrangement with a storage enclosure in a first embodiment and the

Figure 2 shows an arrangement with a storage enclosure in a second embodiment.

The arrangements shown in the figures each have a plurality of encapsulating housings. The arrangements are so-called switchgear systems, which have a plurality of encapsulating housings, wherein different electrically active elements are arranged in the interior of the encapsulating housings. The outer shape of the An ^¬ orders can vary. The spatial arrangement as well as internal design variants are described in greater detail by way of example in PCT Publication WO 2000/45486.

The arrangement shown in FIG. 1 has a first, a second and a third encapsulating housing 1, 2, 3. The capsule housing 1, 2, 3 are for example welded tanks or cast containers which have different connection ^¬ flanges. By means of corresponding connecting flanges, the first and the second encapsulating housings 1, 2 and the second and the third encapsulating housings 2, 3 are connected to one another connected. In the area of joining points of the respective encapsulating housing 1, 2, 3 are each fluid-tight barrier are integrally ^¬ arranged so that each of the capsule housing 1, 2, includes a sepa rates ^¬ volume in its interior. 3 Inside the encapsulating housings 1, 2, 3 different electrically active elements such as circuit breakers, circuit breakers, voltage or current transformers, etc. are arranged. In order to increase the dielectric strength of the volumes of the Kapselungsge ^¬ housing 1, 2, 3, aeration filled with a medium, preferably a fluid. When gaseous fluids are used, they are advantageously provided with a pressure which is increased in relation to a medium surrounding the encapsulating housings 1, 2, 3.

Each of the encapsulating housings 1, 2, 3 has a pressure-securing device 4a, 4b, 4c. The pressure-securing devices 4a, 4b, 4c are designed, for example, in the form of Berstele ^¬ elements or by pressure valves. Each of the pressure relief devices 4a, 4b, 4c is provided to one channel 5a, 5b, 5c, which each open into a common men storage enclosure 6, wherein the occurrence of a kriti ^¬ rule pressure difference between the respective volumes of the respective encapsulating housing 1, 2 , 3 and the interior of the ge ^¬ common memory housing 6 to switch and form a connection between the respective volume of the encapsulating housing 1, 2, 3 and the common memory housing 6. In this case, it is provided that each of the encapsulating housings 1, 2, 3 has a separate channel 5a, 5b, 5c which is in each case connected directly to the common storage housing 6.

2 shows a second embodiment of a switchgear with a plurality of encapsulating 6, 7, 8, 9, 10 is shown. The encapsulating housing 6, 7, 8, 9, 10 are as ^¬ derum angle in a certain manner among themselves rigidly connected, wherein each of the encapsulating 6, 7, 8, 9, 10 terminates a separate volume. Each of the encapsulating ^¬ housing 6, 7, 8, 9, 10 is a channel 6a, 7a, 8a, 9a, 10a to ^¬ ordered. Each of the channels 6a, 7a, 8a, 9, 10a is switchable by means of a pressure-securing device, so that the respective volume of the respective encapsulating housing 6, 7, 8, 9, 10 with the respective channel 6a, 7a, 8a, 9a, 10a is connectable. All channels 6a, 7a, 8a, 9a, 10a open into a collecting channel 11. The collecting channel 11 in turn is connected to a common storage housing 6a. This makes it possible to reduce the total length of the Ge ^¬ to be laid channels. Furthermore, it is also possible to access the channels 5a, 5b, 5c, 6a, 7a, 8a, 9a, 10a themselves for increasing the receiving volume of the common storage housing 6, 6a.

Claims

claims

1. Arrangement with an encapsulating housing (1, 2, 3, 6, 7, 8, 9, 10), which surrounds a first volume and a pressure equalization enabling pressure relief device (4a, 4b, 4c), characterized in that by means of the pressure-securing device (4a, 4b, 4c) between the first volume and a storage housing (6, 6a) extending channel (5a, 5b, 5c, 6a, 7a, 8a, 9a, 10a) is switch ^¬ bar.

2. Arrangement according to claim 1, characterized in that the pressure-securing device (4a, 4b, 4c) is a Überdrucksi ^¬ cherungseinrichtung of the encapsulating (1, 2, 3, 6, 7, 8, 9, 10).

3. Arrangement according to claim 1 or 2, characterized in that within the first volume at least one electrically akti ^¬ ves element is arranged, which with respect to the encapsulation ^¬ housing (1, 2, 3, 6, 7, 8, 9, 10) electrically is isolated.

4. Arrangement according to one of claims 1 to 3, d a d u r c h e c e n e c e s in that there is disposed within the first volume of a fluid under elevated pressure.

5. Arrangement according to one of claims 1 to 4, characterized in that the pressure-securing device (4a, 4b, 4c) is a bursting element.

6. Arrangement according to one of claims 1 to 5, characterized in that different volumes by means of different pressure assurance ^¬ devices (4a, 4b, 4c) with the storage enclosure (6, 6a) are connectable.

7. Arrangement according to one of claims 4 to 6, characterized in that the storage housing (6, 6a) the fluid from a housing housing the Kapse- (1, 2, 3; 6, 7, 8, 9, 10) se ^¬ parried.

8. Method for protecting an encapsulating housing (1, 2, 3, 6,

7, 8, 9, 10) from damage, that a pressure-securing device (4a, 4b, 4c) of the encapsulating housing (1, 2, 3, 6, 7,

8, 9, 10) a sealed connection between a first volume which is bounded by the encapsulating housing (1, 2, 3; 6, 7, 8, 9, 10) and a storage housing (6, 6a) is free ^¬ .

9, method for protecting an encapsulating housing (1, 2, 3, 6, 7, 8, 9, 10) according to claim 8, characterized in that after a release of the compound, the encapsulating housing (1, 2, 3, 6, 7, 8 , 9, 10) and the accumulator housing (6, 6a) volatilization of an originally within the Kapselungsge ^¬ häuses (1, 2, 3; changed fluid located 6, 7, 8, 9, 10) prevent.