EP3121825A1 - Receiver device for receiving insulating fluid - Google Patents

Abstract

The invention relates to a receiving device (5) for receiving insulating liquid from a boiler (3) of a transformer or a throttle. The receiving device (5) comprises a receiving container (9), which is designed as a hollow body and with a boiler opening (13) of the boiler (3) is connectable, so that through the boiler opening (13) insulating liquid between a boiler interior of the boiler (3) and an interior of the receptacle (9) can flow. Furthermore, the receiving device (5) comprises a compensator (7), which is designed as a hollow body with a variable Kompensatorvolumen and relative to the receptacle (9) closed in the receptacle (9) can be arranged.

Description

The invention relates to a receiving device for receiving insulating fluid from a boiler of a transformer or a reactor and a housing of a transformer or a throttle.

The housings of transformers and chokes are often filled with a special insulating liquid, for example insulating or transformer oil, which serves to electrically insulate and / or cool the windings of the transformers and reactors. In particular, temperature changes in the operation of the transformers and chokes cause volume changes of the insulating liquid in the housing, which must be compensated. To compensate for such changes in volume expansion vessels are often used, which absorb a variable amount of liquid in the event of an increase in volume of the insulating liquid and can deliver again in subsequent volume decrease.

Known expansion vessels are adapted to receive a variable amount of liquid to exchange except the insulating liquid air with an environment of the housing (to "breathe"), so that the recorded air volume occupies the not filled by insulating fluid volume of the expansion vessel and ensures pressure equalization. The air is stored in the expansion vessel, for example in a rubber bag or separated by an elastic membrane of the insulating liquid to prevent oxygen and moisture from the air pass into the insulating liquid and to a faster aging and reducing the insulating ability of the insulating liquid and other insulating material like insulating paper in the case lead. However, such expansion vessels do not completely occlude (hermetically) the housing from the ambient air through the skin a rubber bag or through a membrane always passes a certain amount of oxygen and moisture in the air in the insulating liquid and gradually impaired.

Damage to the insulation may in rare cases lead to the formation of an arc inside the liquid-filled housing. Due to the resulting extreme heat insulating liquid evaporates abruptly in the arc. The resulting large increase in volume causes a sudden increase in pressure inside the housing. One possible consequence of this pressure increase is the bursting of the housing, which in the worst case results in a fire. In order to master the stresses resulting from the high pressure, constructive measures and an increased use of materials are needed. For example, to a pressure relief valve is used, which is opened at positive pressure to allow the escape of gas and insulating liquid from the housing, or the housing is connected by a rupture disc provided with a flange with a decompression chamber, so that the rupture disc bursts at overpressure and the decompression chamber can absorb gas and insulating fluid.

The invention has for its object to provide an improved recording device for receiving insulating liquid from a boiler of a transformer or a reactor and an improved housing of a transformer or a throttle.

The object is achieved with respect to the receiving device by the features of claim 1 and in terms of the housing by the features of claim 15.

Advantageous embodiments of the invention are the subject of the dependent claims.

A receiving device according to the invention for receiving insulating liquid from a boiler of a transformer or a throttle comprises a receptacle which is formed as a hollow body and is connectable to a boiler opening of the boiler, so that through the boiler opening insulating liquid between a boiler interior of the boiler and an interior of the receptacle can flow. Further, the receiving device comprises a compensator, which is designed as a hollow body with a variable Kompensatorvolumen and closed relative to the receptacle can be arranged in the receptacle can be arranged.

The term "boiler" is used here and below generally in terms of a container filled with insulating liquid and thus includes, for example, filled with insulating cable junction boxes and switch chambers.

The arrangement of the compensator in the receptacle makes it possible to fill the receptacle with a variable amount of insulating liquid, wherein the compensator occupies the non-filled by insulating liquid volume of the receptacle. The compensator has a similar function as a rubber bag of a conventional expansion vessel. Compared to a rubber bag, however, the compensator has the advantage that it can be hermetically separated from the ambient air through it, so that the insulating liquid is not affected by oxygen and moisture from the ambient air.

In addition, the receptacle may have a relatively large cross-sectional area and therefore be connected via a correspondingly large vessel opening with the boiler interior of the boiler, while a conventional expansion vessel is connected by a tube with a relatively small cross-sectional area with the boiler interior. The large cross-sectional area and large vessel opening allow rapid response to and compensation for volume changes of the insulating fluid. As a result, sudden changes in the volume of the insulating fluid caused by arcs in the interior of the boiler and the resulting pressure increases can be compensated for faster and more effectively than by means of conventional expansion vessels.

The arrangement of the compensator in the receptacle of the compensator is further protected by the receptacle against an external environment and is guided in a transport through the wall of the receptacle. In addition, since the compensator is compressed in a pressure increase in the boiler, there is no risk that the compensator will be overstretched by a pressure increase. Furthermore, the compensator can dissipate heat from the insulating liquid through the contact with the insulating liquid and thus contribute to a cooling of the insulating liquid. The compensator can also be used as a storage container for storage of spare and reserve components of the receiving device and / or the transformer or the throttle. At the receptacle advantageous connections for piping of filled with insulating cable junction boxes can be attached.

An embodiment of the invention provides that the compensator for forming the variable compensator volume has a bellows.

By means of a bellows, a variable compensator volume of the compensator which can be adapted to a quantity of insulating liquid to be received can advantageously be realized in a simple manner.

A further embodiment of the invention provides that a compensator bottom of the compensator a

Buchholzrelaisinnenanschluss having a bottom opening in the Kompensatorboden for connecting a arranged in a Kompensatorinneren the compensator Buchholz relay. An underside of the compensator base preferably has a gas-collecting collar for collecting gas.

Such Buchholzrelaisinnenanschluss makes it possible to arrange a Buchholz relay in the compensator. As a result, the height of the receiving device relative to an arrangement of a Buchholz relay is advantageously saved at an upper side of the receiving device. The gas-retaining collar makes it possible for gas to collect from the boiler under the compensator bottom and to be fed to the Buchholz relay.

A further embodiment of the invention provides that the compensator has a pressure relief valve, by means of which insulating liquid and / or gas can be conducted into a Kompensatorinneres of the compensator when the compensator is arranged in the receptacle and a pressure in the receptacle exceeds a pressure threshold. Alternatively, the compensator may also include a rupture disk configured to burst when pressure in the receptacle exceeds a pressure threshold.

As a result, the compensator also acts as a protection against overpressure in the boiler.

A further embodiment of the invention provides a first gas opening through which gas can flow between a compensator interior of the compensator and an environment of the receiving device when the compensator is arranged in the receptacle. Preferably, the receiving device further comprises a first lid, which is designed to close the compensator and has the first gas opening.

By means of such a first gas opening, the compensator can "breathe", so that no overpressure or underpressure arises in its interior, which counteracts a change in the compensator volume. A lid for closing the compensator allows the inside of the compensator to be protected against contamination and environmental influences.

A further embodiment of the invention provides that in the receiving container at a second gas opening, a gas container with a variable gas container volume can be arranged, so that gas can flow between the gas container volume and an environment of the receiving container. Preferably, a gas dehumidifier connection for a gas dehumidifier is arranged at the second gas opening, or the second gas opening is closed with a semipermeable membrane which is permeable to gas but not to liquid. The gas container is preferably designed as a rubber bag. Furthermore, the receiving device preferably has a second lid, which is designed to close the receiving container and has the second gas opening.

These embodiments of the invention take into account that in problem cases in which the compensator, for example, by damage, is not functional, a restoration of the functioning of the recording device by a repair or replacement of the compensator and thus a restart of the transformer or the throttle under certain circumstances associated with a high time and / or cost. To counteract this problem, the abovementioned embodiments of the invention provide that a gas container with a variable gas container volume can be arranged in the receptacle at a second gas opening. This makes it possible to operate the receiving container in the event of malfunction of the compensator as a conventional expansion vessel, wherein the gas container performs the function of Compensator takes over. This allows a period to be bridged to a repair or replacement of the compensator, without having to interrupt the operation of the transformer or the throttle long. If necessary, the compensator need not be repaired or replaced in such cases, even if a permanent continuation of the operation of the transformer or the throttle with the gas container instead of the compensator is acceptable. The formation of the gas container as a rubber bag is a simple and proven design of the gas container for receiving a variable volume of gas. By means of a gas dehumidifier connection to the second gas opening, a gas dehumidifier can advantageously be connected in order to dehumidify gas which enters the gas container, so that less moisture from gas contained in the gas container passes into the insulating liquid. Alternatively, the entry of moisture through a semi-permeable membrane can be prevented or reduced. A lid, which is designed to close the receptacle and has the second gas opening, allows a simple conversion of the receiving device for its operation as a conventional expansion vessel.

The aforementioned embodiments of the invention may also be designed such that the first lid and the second lid are identical.

This advantageously reduces the number of components of the receiving device.

Furthermore, the first gas opening and the second gas opening may be identical.

This advantageously only a gas opening is needed, which is used for the compensator and the gas tank.

A further embodiment of the invention provides a Buchholz relay external connection for the connection of a Buchholz relay on an outer surface of the receiving device to the interior of the receptacle before.

This advantageously allows an external connection of a Buchholz relay in operation with the gas container and in operation with the compensator, if this does not have a Buchholzrelaisinnenanschluss.

An inventive housing of a transformer or a throttle comprises a boiler with a vessel opening and a receiving device according to the invention for receiving insulating liquid from the boiler with the above-mentioned advantages.

• FIG 1 schematisch eine Seitenansicht eines Gehäuses eines Transformators oder einer Drossel in einem Kompensatorbetrieb,
• FIG 2 eine Schnittdarstellung des in Figur 1 dargestellten Gehäuses in dem Kompensatorbetrieb, und
• FIG 3 eine Schnittdarstellung des in den Figuren 1 und 2 dargestellten Gehäuses in einem Ausdehnungsgefäßbetrieb.

The above-described characteristics, features, and advantages of this invention, as well as the manner in which they will be achieved, will become clearer and more clearly understood in connection with the following description of exemplary embodiments which will be described in detail in conjunction with the drawings. Showing:

• FIG. 1 2 is a schematic side view of a housing of a transformer or a throttle in a compensator mode;
• FIG. 2 a sectional view of the in FIG. 1 shown housing in the Kompensatorbetrieb, and
• FIG. 3 a sectional view of the in the FIGS. 1 and 2 shown housing in an expansion vessel operation.

Corresponding parts are provided in the figures with the same reference numerals.

The FIGS. 1 to 3 show a housing 1 of a transformer or a throttle. The housing 1 comprises a boiler 3 and a receiving device 5 for receiving insulating liquid from the boiler 3.

The pickup device 5 comprises a compensator 7 and a receptacle 9 and is adapted to be selectively operated in one of two different modes of operation. Hereinafter, a first mode of operation will be referred to as a compensator mode and the second mode of operation will be referred to as an expansion vessel mode. The FIGS. 1 and 2 show the receiving device 5 in the Kompensatorbetrieb. FIG. 3 shows the receiving device 5 in the expansion vessel operation. It shows FIG. 1 a schematic side view of the housing 1 and the Figures 2 and 3 each show a sectional view of the housing 1, wherein in the Figures 2 and 3 in each case only a section of a boiler lid 11 of the boiler 3 in the region of a boiler opening 13 in the boiler lid 11 is shown.

The compensator 7 comprises a Kompensatorboden 15, a Kompensatorflansch 17 and a bellows 19 which connects the Kompensatorboden 15 and the Kompensatorflansch 17 with each other. The compensator bottom 15 is plate-like. The Kompensatorflansch 17 is annular. The bellows 19 makes it possible to change the compensator volume like a concertina. The bellows 19 is made for example of a metallic material or a rubber.

The compensator bottom 15 optionally has a Buchholzrelaisinnenanschluss 21 with a bottom opening 23 in the Kompensatorboden 15 for the connection of a arranged in a Kompensatorinneren the compensator 7 Buchholz relay 25. An underside of the compensator bottom 15 optionally has a gas-retaining collar 27 for collecting gas. Furthermore, an overpressure valve 29 is optionally arranged on the compensator bottom 15, by means of which a fluid surrounding the compensator 7 can be conducted into the compensator interior when a pressure in the fluid exceeds a pressure threshold value.

The receptacle 9 is formed substantially as a hollow cylinder and made vacuum-resistant of a metallic material. The receptacle 9 is the boiler opening 13 closably attached to the vessel lid 11, so that through the vessel opening 13 insulating liquid between a boiler interior of the boiler 3 and an interior of the receptacle 9 can flow. For this purpose, the receptacle 9 an annular mounting flange 31 which is detachably connected, for example by screw, with the vessel lid 11. Alternatively, the receptacle 9 also fixed, for example by a welded joint, be attached to the boiler lid 11. An end of the receptacle 9 facing away from the vessel lid 11 is formed by an annular closure flange 33. On an outer side, the receptacle 9 optionally has at least one pipe connection 35 for cable junction boxes. To increase the rigidity of the receiving container 9, areas of an inner surface of the receiving container 9 in the vicinity of the vessel opening 13 are optionally connected to one another by stiffening elements 37.

Instead of fixing the receptacle 9 directly to the vessel 3, it may also be arranged at a distance from the vessel 3 and be connected to the vessel 3 by a rigid connection, for example a pipeline, or a flexible connection, for example a connecting hose. so that insulating liquid from the boiler 3 in the receptacle 9 and from the receptacle 9 in the boiler 3 can flow.

In the in the FIGS. 1 and 2 shown Compensatorbetrieb the compensator 7 is arranged in the receptacle 9. In this case, the Kompensatorflansch 17 of the compensator 7 is detachably, for example by screw, attached to the Verschließflansch 33 of the receptacle 9, so that the Kompensatorboden 15 facing surface of the Kompensatorflansches 17 abuts the Verschließflansch 33 and the Kompensatorboden 15 of the boiler opening 13 faces. The compensator 7 is closed by a first cover 39, which is designed as a blind flange and rests with an edge region on a side facing away from the compensator bottom 15 surface of Kompensatorflansches 17. The first cover 39 has a first gas opening 41, through which gas can flow between the compensator interior of the compensator 7 and an environment of the receiving device 5. Above the first gas opening 41, a filter unit 43 is disposed on the first cover 39, which counteracts penetration of undesirable substances such as dirt particles and / or water into the compensator interior.

The compensator 7 is hermetically sealed with respect to the receptacle 9, as long as the pressure in the insulating liquid does not exceed the pressure threshold for which the pressure relief valve 29 is designed. As a result, insulating liquid from the boiler 3 can flow only into a receiving area of the interior of the receiving container 9 surrounding the compensator 7, but not into the compensator 7. Since the compensator 7 has a variable compensator volume through the bellows 19, the volume of the receiving area of the quantity adapts the insulating liquid to be received by the receptacle 9 by the bellows 19 is more folded together with an increase in volume of the insulating liquid, the more insulating liquid flows into the receptacle 9 and again unfolded in a volume decrease of the insulating liquid.

The first gas opening 41 advantageously enables "breathing" of the compensator 7, ie a discharge of gas from the compensator 7 with a decrease of the compensator volume and an introduction of gas into the compensator 7 with an increase of the compensator volume.

The pressure relief valve 29 advantageously allows to guide insulating liquid and / or gas into the compensator 7 when the pressure in the insulating liquid exceeds the pressure threshold.

The Buchholzrelaisinnenanschluss 21 allows to arrange a Buchholz relay 25 in the compensator 7. As a result, in the compensator operation, the height of the receiving device 5 is advantageously reduced compared with an alternative (likewise possible) arrangement of a Buchholz relay 25 on an upper side of the receiving device 5, for example on the first cover 41 or the compensator flange 17. The gas-retaining collar 27 makes it possible for gas to collect from the boiler 3 below the compensator bottom 15 and to be fed to the Buchholz relay 25.

In the in FIG. 3 shown expansion vessel operation, the receiving device 5 is operated without the compensator 7. The receptacle 9 is closed by a second cover 45, which is formed as a blind flange and rests with an edge region on the Verschließflansch 33 of the receptacle 9.

The second cover 45 has a second gas opening 46. Under the second gas opening 46, a gas container 49 with a variable gas container volume designed as a rubber sack is arranged on a surface of the second lid 45 facing the receptacle 9 by means of a gas container flange 47, so that gas between the gas container volume and an environment of the receptacle through the second gas opening 46 can flow. On a surface of the second cover 45 remote from the receptacle 9, a gas dehumidifier port 51 for a gas dehumidifier (not shown) for dehumidifying gas flowing through the second gas opening 46 into the gas container 49 is arranged above the second gas opening 46.

Furthermore, the second cover 45 has a Buchholz relay external connection 53 for the connection of a Buchholz relay 25 on the second cover 45 to the interior of the receptacle 9.

In a preferred embodiment of the receptacle 9, the first lid 39 and the second lid 45 are identical. In this case, in particular, the first gas opening 41 and the second gas opening 46 may also be identical, the gas container 49 being arranged only at the gas opening 41, 46 in the expansion vessel operation. If the first gas opening 41 and the second gas opening 46 are identical, the gas dehumidifier port 51 may further be configured to connect the filter unit 43 in the compensator mode and a gas dehumidifier in the expansion vessel operation.

The pickup device 5 is normally operated in the compensator mode. The expansion vessel operation is intended primarily for problem cases in which the functionality of the compensator 7 is impaired, for example because the compensator 7 is damaged. In order to change from the compensator operation to the expansion vessel operation, the first cover 39 is first removed from the compensator 7. Subsequently, the compensator 7 is released from the receptacle 9 and removed. Thereafter, the receptacle 9 is closed by means of the gas container 49 provided with the second lid 46, to the gas dehumidifier port 51, a gas dehumidifier is connected and to the Buchholzrelaisaußenanschluss a Buchholz relay 25 is connected. In the expansion vessel operation, the receptacle 9 acts like a conventional expansion vessel, the gas container 49 "breathing" through the second gas opening 46. The Kompensatorinnere can be used in the Kompensatorbetrieb as storage space for storage of spare and reserve components such as insulating, a spare rubber bag, a spare Buchholz relay and / or overpressure protection valves.

While the invention has been further illustrated and described in detail by way of preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. In particular, a receiving device 5 a plurality of receptacle 9 of the in the Figures 2 and 3 having shown type, each with a compensator 7. The bellows 19 of the compensators 7 may have different degrees of hardness. The degree of hardness of a bellows 19 is understood to mean a resistance that the bellows 19 opposes to its change in length. For example, at least one first compensator 7 has a bellows 19 with a first degree of hardness and at least one second compensator 7 has a bellows 9 with a second degree of hardness that is greater than the first degree of hardness. By a suitable choice of the degrees of hardness and design of the compensators 7 can be achieved that are compensated with the first compensators 7 primarily thermally induced volume changes of the insulating liquid, which occur in a normal operation of the transformer or the throttle, while with the second compensators 7 mainly abrupt Volume changes of the insulating liquid can be compensated, which are caused by arcs in the boiler 3.

Claims (15)

Receiving device (5) for receiving insulating liquid from a boiler (3) of a transformer or a throttle, comprising - A receptacle (9) which is formed as a hollow body and with a vessel opening (13) of the boiler (3) is connectable, so that through the boiler opening (13) insulating liquid between a boiler interior of the boiler (3) and an interior of the receptacle (9) can flow - And a compensator (7), which is designed as a hollow body with a variable Kompensatorvolumen and relative to the receptacle (9) closed in the receptacle (9) can be arranged. Receiving device (5) according to claim 1,
characterized in that the compensator (7) for forming the variable Kompensatorvolumens a bellows (19). Receiving device (5) according to one of the preceding claims,
characterized in that a Kompensatorboden (15) of the compensator (7) has a Buchholzrelaisinnenanschluss (21) with a bottom opening (23) in the Kompensatorboden (15) for the connection of a Kompensatorinneren the compensator (7) arranged Buchholz relay (25). Receiving device (5) according to claim 3,
characterized in that a bottom of Kompensatorbodens (15) has a gas collecting collar (27) for collecting gas. Receiving device (5) according to one of the preceding claims,
characterized in that the compensator (7) comprises an overpressure valve (29), by means of which Insulating fluid and / or gas in a Kompensatorinneres of the compensator (7) is conductable when the compensator (7) is arranged in the receptacle (9) and a pressure in the receptacle (9) exceeds a pressure threshold. Receiving device (5) according to one of the preceding claims,
characterized by a first gas opening (41) through which gas can flow between a compensator interior of the compensator (7) and an environment of the receiving device (5) when the compensator (7) is arranged in the receptacle (9). Receiving device (5) according to claim 5,
characterized by a first cover (39) which is designed to close the compensator (7) and has the first gas opening (41). Receiving device (5) according to one of the preceding claims,
characterized in that in the receptacle (9) at a second gas opening (46) a gas container (49) with a variable gas container volume can be arranged so that gas can flow between the gas container volume and an environment of the receptacle (9). Receiving device (5) according to claim 8,
characterized in that a gas dehumidifier port (51) for a gas dehumidifier is arranged on the second gas opening (46). Receiving device (5) according to claim 8 or 9,
characterized in that the gas container (49) is formed as a rubber bag. Receiving device (5) according to one of claims 8 to 10,
characterized by a second cover (45) which is designed to close the receptacle (9) and has the second gas opening (46). Receiving device (5) according to claims 7 and 11,
characterized in that the first lid (39) and the second lid (45) are identical. Receiving device (5) according to claims 6 or 7 and one of claims 8 to 11, or according to claim 12,
characterized in that the first gas opening (41) and the second gas opening (46) are identical. Receiving device (5) according to one of the preceding claims,
characterized by a Buchholz relay external terminal (53) for connecting a Buchholz relay (25) on an outer surface of the receiving device (5) to the interior of the receptacle (9). Housing (1) of a transformer or a throttle, the housing (1) comprising a boiler (3) with a vessel opening (13) and a receiving device (5) according to one of the preceding claims.

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