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The present disclosure relates to a conservator tank for a transformer. The present disclosure further relates to a power transformer comprising the conservator tank.
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Inside the conservator tanks of transformers, rubber bags are installed. The inner side of a conservator tank is lined with the rubber bag. The rubber bag is used to protect the dielectric oil in the power transformer. The rubber bag is also called a flexible separator or compensation balloon.
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It is an object to provide a conservator tank, which is simple to manufacture, while increasing its longevity.
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This object is solved by the features of the independent claims. Advantageous embodiments are indicated in the dependent claims.
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Embodiments of the disclosure, for instance as claimed in the independent claims, address the above shortcomings in the art in whole or in part. Further embodiments of the conservator tank are subject matter of the further claims.
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There is provided a conservator tank for a transformer tank. The conservator tank comprises a housing. The housing has a magnetic inner surface. The transformer tank and the conservator tank are for example made of structural steel, which is an example of a magnetic material.
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The housing is configured to house an insulation oil inside the housing. The inner surface faces the insulation oil. An oil level gauge is configured to detect an oil level of the insulation oil in the housing.
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The conservator tank further comprises a rubber bag. The longest side of the rubber bag extends along a first direction. The rubber bag has an upper part. The upper part faces away from the insulation oil. The rubber bag has a lower part. The lower part is opposite the upper part along a second direction. The lower part faces towards the insulation oil.
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The rubber bag has a first peripheral side. The first peripheral side extends mainly along the second direction and along a third direction. The first peripheral side is arranged between the upper part and the lower part. The rubber bag has a second peripheral side. The second peripheral side extends mainly along the second direction and along the third direction. The second peripheral side is arranged between the upper part and the lower part. The second peripheral side is opposite the first peripheral side.
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The rubber bag is configured to inflate or deflate inside the housing, such that the lower part contacts and immerses into an oil surface of the insulation oil. The rubber bag is inflated and deflated by a breather with a desiccant air dryer, for example.
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The rubber bag inflates and deflates inside the conservator tank by compensating for the change in volume. The rubber bag provides separation between air and the dielectric oil, also called transformer oil or insulation oil, inside a hydraulic conservator. This avoids oil pollution, condensation, oxidation and hydrolysis. Thus, the system protects the dielectric oil from external contamination. The rubber bag allows for changes in oil volume inside the conservator tank, while protecting the oil from any type of contamination or external corrosive agents. Corrosive agents are for example air, ozone, nitrogen or humidity.
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The rubber bag is made from an elastomer-coated fabric, vulcanized at high temperature under vacuum. The external coating is designed to provide a very high resistance to the transformer oil. The internal protection is resistant to nitrogen and atmospheric agents including ozone.
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The rubber bag has a rubber layer. The rubber layer has a first magnetic fastening element. The first magnetic fastening element is arranged on the upper part. The first magnetic fastening element extends for example mainly along the first direction. The longest side of the first magnetic fastening element extends for example along the first direction. Alternatively, the longest side of the first magnetic fastening element extends for example along the second direction. Alternatively, the longest side of the first magnetic fastening element extends for example along the third direction.
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The first magnetic fastening element is configured to be attached to the magnetic inner surface of the housing in a mounted state of the rubber bag. A mounted state is for example an operational state of the conservator tank or the power transformer.
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Placing the first magnetic fastening element on the rubber bag facilitates fixation of the rubber bag to the conservator tank in a defined position. The position of the rubber bag can be easily controlled and changed.
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The rubber layer is for example a pocket, which accommodates the first magnetic fastening element. The rubber layer is for example an additional layer of the rubber bag. The rubber layer protects the first magnetic fastening element.
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The use of the magnetic fastening element improves the durability of the rubber bag. With the magnetic fastening element, tearing of the rubber bag is less likely due to friction between welded attachments, like hooks, on the inside of the conservator tank and the rubber bag. Thus, the rubber bag is less exposed to mechanical wear, for example during the movement of the transformer, mainly during shipping to a customer. The magnetic fastening element reduces the stress from the contact between inner side of the conservator tank and rubber bag distributed along the length of the rubber bag. Furthermore, welding and placing of the hooks can be omitted so the construction of the conservator tank is simpler and less expensive.
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According to an embodiment, the rubber layer is arranged on an inner side of the rubber bag. During manufacturing of the rubber bag, the rubber layer with the first magnetic fastening element is placed inside the rubber bag. This facilitates an integrated structure of the rubber bag and the first magnetic fastening element.
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Additionally, or alternatively, the rubber layer is arranged on an outer side of the rubber bag. Arranging the rubber layer with the first magnetic fastening element on the outer side of the rubber bag enables the first magnetic fastening element to be retrofitted to already existing rubber bags.
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The rubber layer with the first magnetic fastening element can be arranged on the inner side and on the outer side of the rubber bag in order to achieve a higher holding force between the rubber bag and the conservator tank. The first magnetic fastening element can be arranged on the inner side and on the outer side of the rubber bag with the rubber layer or without using the rubber layer.
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According to an embodiment, the rubber layer is embedded in the rubber bag. During manufacturing of the rubber bag, the rubber layer with the first magnetic fastening element is embedded in the rubber bag. The rubber layer becomes an integrated structure of the rubber bag. With the embedded rubber layer, the first magnetic fastening element is less likely to be damaged due to friction or corrosive agents.
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According to an embodiment, the rubber bag comprises two first magnetic fastening elements. The two first magnetic fastening elements are arranged on the upper part of the rubber bag. The two first magnetic fastening elements extend for example mainly along the first direction. The two first magnetic fastening elements are arranged parallel to each other, for example.
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The rubber bag is not limited to just two first magnetic fastening elements. The rubber bag comprises for example a plurality of first magnetic fastening elements. Multiple first magnetic fastening elements of the rubber bag achieve a higher holding force between the rubber bag and the conservator tank. Depending on the holding force required, the number of first magnetic fastening elements can be varied.
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According to an embodiment, the first magnetic fastening element is split into at least two parts. One first magnetic fastening element can also be split into two parts along the first direction, for example. The split magnetic fastening element enables creating space on the rubber bag for a valve shutter, for example. The first magnetic fastening element is not limited to two parts. Alternatively, the first magnetic fastening element is split into more than two parts. For example, the first magnetic fastening element is split into three, four, five, six, seven or even more parts along the first direction. Alternatively, or additionally, the first magnetic fastening element is split into several parts along the second direction and/or in the third direction.
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Alternatively, or additionally, the plurality of the first magnetic fastening elements can also be split into several parts. The plurality of the first magnetic fastening elements is split into two three, four, five, six, seven or even more parts along the three directions. A combination of differently split first magnetic fastening elements is also possible.
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According to an embodiment, the first magnetic fastening element comprises a magnetic tape.
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According to an embodiment, the rubber bag has a second magnetic fastening element arranged on the first peripheral side and/or on the second peripheral side.
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The second magnetic fastening element is arranged on the first peripheral side. Alternatively, or additionally the second magnetic fastening element is arranged on the second peripheral side. The second magnetic fastening element extends for example mainly along the second direction and the third direction.
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The second magnetic fastening element is configured to be attached to the magnetic inner surface of the housing in a mounted state of the rubber bag.
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Placing the second magnetic fastening element on the rubber bag facilitates fixation of the rubber bag to the conservator tank in a defined position. The position of the rubber bag can be easily controlled and changed with the first magnetic fastening element and with the second magnetic fastening element.
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The rubber bag is not limited to just one second magnetic fastening element. The rubber bag comprises for example a plurality of second magnetic fastening elements. The rubber bag comprises one second magnetic fastening element on the first peripheral side and one second magnetic fastening element on the second peripheral side. Multiple second magnetic fastening elements of the rubber bag achieve a higher holding force between the rubber bag and the conservator tank. Depending on the holding force required, the number of second magnetic fastening elements can be varied.
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The second magnetic fastening element can be arranged on the inner side of the rubber bag. During manufacturing of the rubber bag, the rubber layer with the second magnetic fastening element is placed inside the rubber bag. This facilitates an integrated structure of the rubber bag and the second magnetic fastening element.
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Additionally, or alternatively, the second magnetic fastening element is arranged on an outer side of the rubber bag. Arranging the second magnetic fastening element on the outer side of the rubber bag enables the second magnetic fastening element to be retrofitted to already existing rubber bags.
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The second magnetic fastening element can be arranged on the inner side and on the outer side of the rubber bag in order to achieve a higher holding force between the rubber bag and the conservator tank. The second magnetic fastening element can be arranged on the inner side and on the outer side of the rubber bag with the rubber layer or without using the rubber layer.
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The rubber layer is for example a pocket, which accommodates the second magnetic fastening element. The rubber layer is for example an additional layer of the rubber bag. The rubber layer protects the second magnetic fastening element.
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According to an embodiment, the second magnetic fastening element comprises a magnetic spot. The magnetic spot has a circular shape, for example. The magnetic spot has an elliptical shape, for example. The second magnetic fastening element is not limited to circular or elliptical shapes and can have any suitable shape.
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According to an embodiment, the rubber bag has a plurality of third magnetic fastening elements arranged on the upper part.
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The plurality of third magnetic fastening elements can be arranged on the inner side of the rubber bag. During manufacturing of the rubber bag, the rubber layer with the plurality of third magnetic fastening elements is placed inside the rubber bag. This facilitates an integrated structure of the rubber bag and the plurality of third magnetic fastening elements.
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Additionally, or alternatively, the plurality of third magnetic fastening elements is arranged on an outer side of the rubber bag. Arranging the plurality of third magnetic fastening elements on the outer side of the rubber bag enables the plurality of third magnetic fastening elements to be retrofitted to already existing rubber bags.
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The rubber layer is for example a pocket, which accommodates at least one of the plurality of third magnetic fastening elements. The rubber layer is for example an additional layer of the rubber bag. The rubber layer protects the third magnetic fastening element.
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The plurality of third magnetic fastening elements can be arranged on the inner side and on the outer side of the rubber bag in order to achieve a higher holding force between the rubber bag and the conservator tank. The plurality of third magnetic fastening elements can be arranged on the inner side and on the outer side of the rubber bag with the rubber layer or without using the rubber layer.
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For example, the plurality of third magnetic fastening elements comprises two, three, four, five, six, seven or even more magnetic fastening elements. The plurality of third magnetic fastening elements is arranged on the upper part of the rubber bag. The plurality of third magnetic fastening elements is configured to be attached to the magnetic inner surface of the housing in a mounted state of the rubber bag.
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Multiple third magnetic fastening elements of the rubber bag achieve a higher holding force between the rubber bag and the conservator tank. Depending on the holding force required, the number of third magnetic fastening elements can be varied.
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According to an embodiment, the third magnetic fastening element is a magnetic pill with a circular or elliptical shape.
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The magnetic pill has a circular shape, for example. The magnetic pill has an elliptical shape, for example. The third magnetic fastening elements are not limited to circular or elliptical shapes and can have any suitable shape. The magnetic pills extend mainly along the first direction and along a combination of the second and third direction. The magnetic pills have a smaller surface area than the magnetic spots.
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The first magnetic fastening element, the second magnetic fastening element and the third magnetic fastening element are made from a material, which has for example ferromagnetic properties. The first magnetic fastening element, the second magnetic fastening element and the third magnetic fastening element comprise a material, which exerts a magnetic force of attraction.
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According to an embodiment, the conservator tank comprises a first mechanical fastening element. The first mechanical fastening element is arranged on the inner surface of the conservator tank. The first mechanical fastening element is welded to the inner surface of the conservator tank, for example. The first mechanical fastening element faces the rubber bag. The rubber bag has a second mechanical fastening element. The second mechanical fastening element is arranged on the first peripheral side. Alternatively, or additionally, the second mechanical fastening element is arranged on the second peripheral side. The second mechanical fastening element is configured to be attached to the first mechanical fastening element. In a hybrid solution one or more magnetic fastening elements are combined with an already existing single hook. This facilitates an improved control over the position of the rubber bag.
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According to an embodiment, the first mechanical fastening element is a hook. The second mechanical fastening element is a lug.
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According to an embodiment, the housing of the conservator tank has a cylindrical, rectangular or ellipsoidal shape.
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The housing of the conservator tank extends mainly along the first direction. Following the shape of the housing, the rubber bag also extends mainly along the first direction. The rubber bag has an expansion in the second and third direction. The cross-section of the housing, which extends in the second and third direction is circular, elliptical or rectangular, for example. The cross-section of the rubber bag in an inflated state, which extends in the second and third direction is circular, elliptical or rectangular, for example.
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There is also provided a power transformer. The power transformer comprises a transformer tank. The power transformer comprises the conservator tank. The conservator tank is coupled to the transformer tank by a shut-off valve, for example.
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While the disclosure is amenable to various modifications and alternative forms, specifics thereof are shown by way of example in the figures and will be described in detail. It should be understood, however, that the intention is not to limit the disclosure to the particular described embodiments and examples. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure defined by the appended claims.
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The accompanying figures are included to provide a further understanding. In the figures, elements of the same structure and/or functionality may be referenced by the same reference signs. It is to be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
- Figure 1 shows a schematic side view of a power transformer with a conservator tank and a transformer tank,
- Figure 2 shows a schematic side view of a conservator tank according to an embodiment,
- Figure 3 shows a perspective view of a conservator tank according to an embodiment,
- Figure 4 shows a cross-section of a partial conservator tank according to an embodiment,
- Figure 5 shows a perspective view of a conservator tank according to a further embodiment,
- Figure 6 shows a cross-section of a partial conservator tank according to a further embodiment,
- Figure 7 shows a perspective view of a conservator tank according to a further embodiment,
- Figures 8 to 10 show each a schematic side view of a conservator tank according to embodiments,
- Figures 9 and 10 show each a perspective view of a conservator tank according to further embodiments.
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Figure 1 shows a schematic side view of a power transformer 1. The power transformer 1 comprises a conservator tank 100 and a transformer tank 200. The conservator tank 100 is coupled to the transformer tank 200. The conservator tank 100 is coupled to the transformer tank 200 for example by a shut-off valve 300. The conserver tank 100 comprises a housing 10 with a magnetic inner surface 11. An insulation oil 20 is housed inside the housing 10. An oil level gauge 40 is configured to detect an oil level of the insulation oil 20 in the housing 10.
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The conservator tank 100 further comprises a rubber bag 30. The rubber bag 30 extends mainly along a first direction L1. The rubber bag 30 extends also along a second direction L2. The second direction L2 is perpendicular to the first direction L1. The rubber bag 30 extends also along a third direction L3. The third direction L3 is perpendicular to the first direction L1 and to the second direction L2. The rubber bag 30 has an upper part 31. The upper part 31 is facing away from the insulation oil 20. The rubber bag 30 has a lower part 32. The lower part 32 is opposite the upper part 31 along the second direction L2 and is facing towards the insulation oil 20. The upper part 31 is arranged along the second direction L2 above the center of the rubber bag 30. The center of the rubber bag 30 is depicted as dotted line. The lower part 32 is arranged along the second direction L2 below the center of the rubber bag 30.
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The rubber bag 30 has a first peripheral side 33. The first peripheral side 33 extends mainly along the second direction L2 and along the third direction L3. The first peripheral side 33 is arranged between the upper part 31 and the lower part 32. The rubber bag 30 has a second peripheral side 34. The second peripheral side 34 extends mainly along the second direction L2 and along the third direction L3. The second peripheral side 34 is arranged between the upper part 31 and the lower part 32 opposite the first peripheral side 33.
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The rubber bag 30 is configured to inflate or deflate inside the housing 10 in all three directions L1, L2, and L3, such that the lower part 32 contacts an oil surface 21 of the insulation oil 20. The rubber bag 30 can be partially or completely immersed in the insulation oil 20. In figure 1 the rubber bag 30 does not contact the oil surface 21, yet. The rubber bag 30 is for example filled with air. The rubber bag 30 is for example inflated and deflated by a breather with a desiccant air dryer 400.
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The rubber bag 30 has a rubber layer 35. The rubber layer 35 has a first magnetic fastening element 36 arranged on the upper part 31. The first magnetic fastening element 36 is configured to be attached to the magnetic inner surface 11 of the housing 10 in a mounted state of the rubber bag 30.
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The first magnetic fastening element 36 is for example a magnetic tape or an element, which has magnetic properties. The first magnetic fastening element 36 has an elongated shape along the first direction L1, for example.
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Figure 2 shows a schematic side view of the conservator tank 100. For sake of clarity, figure 2 shows just the conservator tank 100 from figure 1. The conservator tank 100 further comprises an inner side 38 and an outer side 39. The inner side 38 of the rubber bag 30 is inside the rubber bag 30. The inner side 38 is not exposed to the environment. The outer side 39 is outside of the rubber bag 30 and faces the environment. The outer side 39 faces for example the insulation oil 20. In figure 2 the rubber bag 30 contacts the oil surface 21 with the lower part 32. The first magnetic fastening element 36 is arranged on the upper part 31. The first magnetic fastening element 36 extends for example mainly along the first direction L1. The longest side of the first magnetic fastening element 36 extends for example along the first direction L1.
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The first magnetic fastening element 36 is inside the rubber layer 35 or at least covered by the rubber layer 35. The rubber layer 35 protects the first magnetic fastening element 36. For example, the rubber layer 35 protects the first magnetic fastening element 36 from corrosive agents. The rubber layer 35 is for example a pocket, which accommodates the first magnetic fastening element 36. The rubber layer 35 is for example an additional layer of the rubber bag 30.
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Alternatively, the rubber layer 35 is embedded in the rubber bag 30. This facilitates an integrated structure of the rubber bag 30 and the first magnetic fastening element 36. The first magnetic fastening element 36 can be arranged on the inner side 38 of the rubber bag 30. During manufacturing of the rubber bag 30, the rubber layer 35 with the first magnetic fastening element 36 is placed inside the rubber bag 30. This facilitates an integrated structure of the rubber bag 30 and the first magnetic fastening element 36.
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Additionally, or alternatively, the first magnetic fastening element 36 can be arranged on the outer side 39 of the rubber bag 30. Arranging the rubber layer 35 with the first magnetic fastening element 36 on the outer side 39 of the rubber bag 30 enables the first magnetic fastening element 36 to be retrofitted to already existing rubber bags.
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Alternatively, two rubber layers 35 with one first magnetic fastening element 36 each can be arranged on the inner side 38 and on the outer side 39 of the rubber bag 30 in order to achieve a higher holding force between the rubber bag 30 and the conservator tank 100.
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The first magnetic fastening element 36 is configured to be attached to the magnetic inner surface 11 of the housing 10 in a mounted state of the rubber bag 30. A mounted state is for example an operational state of the conservator tank 100.
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Placing the first magnetic fastening element 36 on the rubber bag 30 facilitates fixation of the rubber bag 30 to the conservator tank 100 in a defined position. The position of the rubber bag 30 can be easily controlled and adjusted if necessary.
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Figure 3 shows the conservator tank 100 from figure 2 in a perspective view. The first magnetic fastening element 36 extends mainly along the first direction L1. The longest side of the first magnetic fastening element 36 extends along the first direction L1. The first magnetic fastening element 36 extends also mainly along the third direction L3. The upper part 31 of the rubber bag 30 is curved along the second direction L2 and the third direction L3. Thus, the first magnetic fastening element 36 may also be curved along the second direction L2 and the third direction L3.
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Alternatively, the longest side of the first magnetic fastening element 36 extends for example along the second direction L2. Alternatively, the longest side of the first magnetic fastening element 36 extends for example along the third direction L3. The first magnetic fastening element 36 is for example partially arranged around the circumference of the rubber bag 30. The first magnetic fastening element 36 extends for example along the upper part 31 in the second direction L2 and the third direction L3. In this case a plurality of first magnetic fastening elements 36 are arranged next to each other along the first direction. The plurality of the first magnetic fastening elements 36 are arranged parallel to each other, for example.
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The first peripheral side 33 abuts the magnetic inner surface 11 of the housing 10. The second peripheral side 34 abuts the magnetic inner surface 11 of the housing 10.
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Figure 4 shows a cross-section of a part of the conservator tank 100 from figure 3. The first magnetic fastening element 36 is inside the rubber layer 35. In figure 4 the rubber layer 35 is arranged on the outer side 39 of the rubber bag 30. The outer side 39 faces the magnetic inner surface 11 of the housing 10. The rubber layer 35 is arranged on the upper part 31 of the rubber bag 30. The first magnetic fastening element 36 extends mainly in the first direction L1. The first magnetic fastening element 36 also extends in the second direction L2. The rubber bag 30 is attached to the magnetic inner surface 11 of the housing 10 due to the magnetic force of attraction exerted by the first magnetic fastening element 36 inside the rubber layer 35. The rubber layer 35 is in direct contact to the magnetic inner surface 11 of the housing 10. Thus, the rubber bag 30 is in contact with the housing 10.
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Figure 5 shows the conservator tank 100 in a perspective view in a different configuration. The conservator tank 100 in figure 5 is basically the same as the conservator tank 100 in figure 3, with the difference that the conservator tank 100 comprises two rubber layers 35 with one first magnetic fastening element 36 each.
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Figure 6 shows a cross-section of a part of the conservator tank 100 from figure 5. The two first magnetic fastening elements 36 are inside the two rubber layers 35. In figure 6 the rubber layers 35 are arranged on the outer side 39 of the rubber bag 30. The rubber layers 35 are arranged on the upper part 31 of the rubber bag 30. The first magnetic fastening elements 36 extend mainly in the first direction L1. The first magnetic fastening elements 36 also extend in a direction, which is a combination of the second direction L2 and the third direction L3. The rubber bag 30 is attached to the magnetic inner surface 11 of the housing 10 due to the magnetic force of attraction exerted by the two first magnetic fastening elements 36 inside the rubber layers 35. The rubber layers 35 are in direct contact to the magnetic inner surface 11 of the housing 10. Thus, the rubber bag 30 is in contact with the housing 10. The rubber bag 30 is not limited to two first magnetic fastening elements 36. The rubber bag 30 comprises for example a plurality of first magnetic fastening elements 36. Multiple first magnetic fastening elements 36 of the rubber bag 30 achieve a higher holding force between the rubber bag 30 and the conservator tank 100. Depending on the holding force required, the number of first magnetic fastening elements 36 can be varied. The first magnetic fastening elements 36 are for example partially arranged along the circumference around the rubber bag 30. The circumference of the rubber bag 30 extends along the second direction L2 and the third direction L3.
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Figure 7 shows a perspective view of the conservator tank 100 in a different configuration. The conservator tank 100 is basically the same as the conservator tank 100 in figure 3, with the difference that the rubber bag 30 comprises the rubber layer 35 with the first magnetic fastening element 36 and two second magnetic fastening elements 37. One second magnetic fastening element 37 is arranged on the first peripheral side 33. The other second magnetic fastening element 37 is arranged on the second peripheral side 34. The second magnetic fastening element 37 extends mainly along the second direction L2 and the third direction L3. The second magnetic fastening element 37 is configured to be attached to the magnetic inner surface 11 of the housing 10 in a mounted state of the rubber bag 30.
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Placing the second magnetic fastening element 37 on the rubber bag 30 facilitates fixation of the rubber bag 30 to the conservator tank 100 in a defined position. The position of the rubber bag 30 can be easily controlled and changed with the first magnetic fastening element 36 and with the second magnetic fastening element 37.
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The rubber bag 30 is not limited to just one second magnetic fastening element 37. The rubber bag 30 comprises for example a plurality of second magnetic fastening elements 37. Multiple second magnetic fastening elements 37 of the rubber bag 30 achieve a higher holding force between the rubber bag 30 and the conservator tank 100. Depending on the holding force required, the number of second magnetic fastening elements 37 can be varied.
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The second magnetic fastening element 37 can be arranged on the inner side 38 of the rubber bag 30. Additionally, or alternatively, the second magnetic fastening element 37 is arranged on an outer side 39 of the rubber bag 30. Arranging the second magnetic fastening element 37 on the outer side 39 of the rubber bag 30 enables the second magnetic fastening element 37 to be retrofitted to already existing rubber bags 30.
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The second magnetic fastening element 37 can be arranged on the inner side 38 and on the outer side 39 of the rubber bag 30 in order to achieve a higher holding force between the rubber bag 30 and the conservator tank 100.
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The second magnetic fastening element 37 comprises for example a magnetic spot. The magnetic spot has a circular o elliptical shape. The second magnetic fastening element 37 is not limited to circular or elliptical shapes and can have any suitable shape.
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Figures 8 to 10 show each a schematic side view of the conservator tank 100 in different configurations.
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Figure 8 shows a schematic side view of the conservator tank 100 from figure 7. The two second magnetic fastening elements 37 are arranged on the first peripheral side 33 and on the second peripheral side 34, respectively. The second magnetic fastening elements 37 abut the magnetic inner surface 11 of the housing 10. The second magnetic fastening elements 37 are configured to be attached to the magnetic inner surface 11 of the housing 10 in a mounted state of the rubber bag 30.
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Figure 9 shows a schematic side view of the conservator tank 100 in a different configuration. The conservator tank 100 is basically the same as the conservator tank 100 in figure 8, with the difference that the conservator tank 100 comprises one second magnetic fastening element 37 and a first mechanical fastening element 101. The first mechanical fastening element 101 is arranged on the magnetic inner surface 11 of the conservator tank 100. The first mechanical fastening element 101 is welded to the magnetic inner surface 11 of the conservator tank 100, for example. The first mechanical fastening element 101 faces the rubber bag 30. The rubber bag 30 has a second mechanical fastening element 102. The second mechanical fastening element 102 is arranged on the first peripheral side 33. Alternatively, the second mechanical fastening element 102 is arranged on the second peripheral side 34. The second mechanical fastening element 102 is configured to be attached to the first mechanical fastening element 101. In the hybrid solution of figure 9 the second magnetic fastening element 37 is combined with an already existing first mechanical fastening element 101 and second mechanical fastening element 102, like a hook and a lug. This facilitates an improved control over the position of the rubber bag 30.
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Figure 10 shows a schematic side view of the conservator tank 100 in a different configuration. The conservator tank 100 is basically the same as the conservator tank 100 in figure 9, with the difference that the conservator tank 100 comprises one first mechanical fastening element 101 and no second magnetic fastening element 37 (not shown in figure 10).
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Figure 11 shows a perspective view of the conservator tank 100 in a different configuration. The conservator tank 100 is basically the same as the conservator tank 100 in figure 3, with the difference that the rubber bag 30 comprises the rubber layer 35 with the first magnetic fastening element 36, which is split into two parts. The first magnetic fastening element 36 is split into two parts along the first direction L1. The split first magnetic fastening element 36 enables creating space on the rubber bag 30 for a valve shutter, for example. The first magnetic fastening element 36 is not limited to two parts. Alternatively, the first magnetic fastening element 36 is split into more than two parts. For example, the first magnetic fastening element 36 is split into three, four, five, six, seven or even more parts along the first direction L1. Alternatively, or additionally, the first magnetic fastening element 36 is split into several parts along the second direction L2 and/or along the third direction L3.
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Figure 12 shows a perspective view of the conservator tank 100 in a different configuration. The conservator tank 100 is basically the same as the conservator tank 100 in figure 3, with the difference that the rubber bag 30 has a plurality of third magnetic fastening elements 371 arranged on the upper part 31. The plurality of third magnetic fastening elements 371 can be arranged on the inner side 38 or outer side 39 of the rubber bag 30. Arranging the plurality of third magnetic fastening elements 371 on the outer side 39 of the rubber bag 30 enables the plurality of third magnetic fastening elements 371 to be retrofitted to already existing rubber bags.
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The plurality of third magnetic fastening elements 371 comprises two, three, four, five, six, seven or even more magnetic fastening elements, for example. The third magnetic fastening elements 371 are arranged in groups of for example seven third magnetic fastening elements 371. Each group is arranged along the first direction L1, for example. Several groups of the plurality of third magnetic fastening elements 371 are arranged next to each other along the second direction L2 and the third direction L3 along the circumference of the rubber bag 30, for example. Each group of the third magnetic fastening elements 371 is not limited to seven third magnetic fastening elements 371. Each group may comprise less than seven or more than seven elements.
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The plurality of third magnetic fastening elements 371 is configured to be attached to the magnetic inner surface 11 of the housing 10 in a mounted state of the rubber bag 30. Multiple third magnetic fastening elements 371 of the rubber bag 30 achieve a higher holding force between the rubber bag 30 and the conservator tank 100. Depending on the holding force required, the number of third magnetic fastening elements 371 can be varied.
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The third magnetic fastening elements 371 are magnetic pills with a circular or elliptical shape. The magnetic pills have a circular shape or elliptical shape, for example. The third magnetic fastening elements 371 are not limited to circular or elliptical shapes and can have any suitable shape. The third magnetic fastening elements 371 extend mainly along the first direction L1 and along a combination of the second direction L2 and the third direction L3. The magnetic pills have a smaller surface area than the magnetic spots.
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The embodiments shown in the Figures 1 to 12 as stated represent exemplary embodiments of the conservator tank; therefore, they do not constitute a complete list of all embodiments according to the improved arrangement of the conservator tank. Actual arrangements of the conservator tank may vary from the exemplary embodiments shown above.
Reference Signs
-
- 10
- housing
- 101
- first mechanical fastening element
- 102
- second mechanical fastening element
- 11
- magnetic inner surface
- 20
- insulation oil
- 21
- oil surface
- 30
- rubber bag
- 31
- upper part
- 32
- lower part
- 33
- first peripheral side
- 34
- second peripheral side
- 35
- rubber layer
- 36
- first magnetic fastening element
- 37
- second magnetic fastening element
- 371
- third magnetic fastening element
- 38
- inner side
- 39
- outer side
- 40
- oil level gauge
- 100
- conservator tank
- 200
- transformer tank
- L1
- first direction
- L2
- second direction
- L3
- third direction