EP3494584A1 - Elektrisches gerät mit mehreren kühleinheiten - Google Patents
Elektrisches gerät mit mehreren kühleinheitenInfo
- Publication number
- EP3494584A1 EP3494584A1 EP17772346.7A EP17772346A EP3494584A1 EP 3494584 A1 EP3494584 A1 EP 3494584A1 EP 17772346 A EP17772346 A EP 17772346A EP 3494584 A1 EP3494584 A1 EP 3494584A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- winding
- temperature
- electrical device
- partial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 188
- 238000004804 winding Methods 0.000 claims abstract description 197
- 239000012530 fluid Substances 0.000 claims abstract description 74
- 230000004888 barrier function Effects 0.000 claims abstract description 49
- 239000011810 insulating material Substances 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
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- 150000002148 esters Chemical class 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 230000001419 dependent effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 108090000623 proteins and genes Proteins 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/323—Insulation between winding turns, between winding layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/125—Cooling by synthetic insulating and incombustible liquid
Definitions
- the invention relates to an electrical device for connection to a high-voltage network with a vessel which is filled with an insulating fluid, an active part arranged in the vessel, which has a magnetizable core and partial windings for generating a magnetic field in the core , and a cooling device for cooling the insulating fluid.
- transformers or reactors which are connected to a high voltage network, each a vessel, which is usually with a mineral insulating oil as
- Insulating fluid is filled.
- a transformer an undervoltage and a high-voltage winding are arranged in the vessel ⁇ , which are inductively coupled together via a magnetizable core.
- the insulating fluid is used in addition to the insulation of the windings and for cooling the transformer.
- heated insulating oil led to ⁇ From result of heat via an externally attached to the vessel cooling device ⁇ .
- the cooling is adjusted so that ei ⁇ ne maximum temperature of the insulating fluid is not exceeded, otherwise the solid insulation of the transformer could be damaged.
- alternative insulating fluids such as ester or silicone oils
- These alternative insulating fluids ensure greater fire safety and are also biodegradable.
- Improved environmental compatibility ⁇ friendliness of Isolierfluiden is required in particular for offshore applications. Due to the improved thermal resistance of these alternative insulating fluids, the transformer can be operated at higher temperatures.
- the standard IEEE 1276 (1997).
- insulation systems and materials so-called high-temperature insulation for electrical equipment are known. These are however expensive. For this reason, so-called hybrid solutions have been proposed, in which both high-temperature materials and conventional materials were used as Isolie ⁇ tion.
- the barrier ⁇ system of isolation in a conventional insulation materials while the coil conductor isolated by high-temperature materials.
- the hybrid solutions have the disadvantage that, despite the use of costly high-temperature insulation materials, the operating temperature of the insulating fluid, due to the still used conventional insulating materials, is significantly below the temperature that would be possible with the exclusive use of high-temperature insulation materials.
- the object of the invention is therefore to provide an electrical device of the type mentioned, which is inexpensive and can be operated at the same time at higher temperatures.
- the invention achieves this object by at least one ther- mal barrier, the cooling spaces bounded in each of which a part winding is arranged we ⁇ iquess, wherein thedeein ⁇ direction has at least two cooling units each cooling unit is adapted for cooling an associated part of the winding.
- a thermal barrier in conjunction ⁇ game having at least two cooling units ensures that at least two partial windings may be operated in different temperature portions that are referred to herein as refrigerator temperatures.
- the thermal barrier provides for the formation of at least two cold rooms, which are connected to one of the cooling units.
- the cooling units can thus be combined within the scope of the invention in the NEN cooling rooms different cold room temperatures, ie different temperatures of the insulating fluid and / or the windings set.
- the cooling chamber temperature is expediently set such that a maximum operating temperature predetermined for this cooling chamber is not exceeded. In this way it is possible to use different insulating materials in the cold rooms.
- the partial winding which is arranged in a cold room, which allows higher refrigerator temperatures, be designed lierstoffarm.
- the material of the insulating material is advantageously selected as a function of the position of the respective insulation with respect to the so-called hot spot of the winding.
- a hotspot temperature is the hottest temperature of the solid dielectric or insulating fluid in thermally conductive contact during operation of the electrical device standing electrical conductor of the partial winding.
- the conductor insulation is selected so that the material is not damaged even when reaching the hot spot temperature.
- the conductor insulation can withstand the maximum winding temperature. Solid insulation with a certain distance to the hottest points of the respective partial winding, however, can, if the corresponding temperature gradient permits, be assigned to a lower thermal class.
- the cooling device has at least two cooling units, wherein each cooling unit is set up for cooling ei ⁇ nes associated cooling space.
- each cooling unit is set up for cooling ei ⁇ nes associated cooling space.
- a ⁇ set of two cooling units one of the cooling units can examples game, via supply and discharge lines to a partial winding are connected in such a way that the cooled by a cooling unit isolator fluid is circulated selectively through a full- ⁇ selected part winding and in the refrigerator for the adjustment of the required refrigerator temperature ensures.
- the layered Wick ⁇ ment substructure can be used for targeted delivery of the insulating fluid to the selected sub-winding.
- the cooling circuits Due to the separation of the flow of the Isolierfluides through the cooling space, the cooling circuits can be separated fluidically ⁇ fully continuously, or partially share a common space. This space can each lie upstream or downstream of the cooling chambers in terms of flow.
- the thermal barrier forms a ⁇ A passage opening, which is connected to an output of the cooling device.
- This connection or in other words the connection between the respective cooling unit and the inlet opening can be configured as desired within the scope of the invention. It is essential that the main part of the insulating fluid flow emerging from the respective cooling unit reaches the inlet opening.
- the sinöff ⁇ voltage is formed by a thermal barrier that ei ⁇ NEN cooling chamber at least partially defined, in which a top is disposed voltage winding.
- the high-voltage winding is equipped due to the higher voltage with a more complex insulation.
- the upper voltage ⁇ development must be cooled more than the development Untertheseswick- that is with Hochtemperarturtechnikstoffen isolated.
- the fluid-filled cooling spaces separated from each other by the barrier system are expediently connected hydraulically to one another.
- This connection can be made via the connection to a common expansion vessel used by both cold rooms, or by a partially open design of winding substructures or winding superstructures.
- the thermal barrier encloses a partial winding at least portion as ⁇ .
- the thermal barrier is, for example hohlzylind ⁇ driven constructed and arranged concentrically to at least one part ⁇ development.
- the thermal barrier forms a guide or, in other words, cooling channels for the insulating fluid flow, so that the insulating fluid is conducted over the partial winding.
- the cooling channels can be designed meandering.
- the thermal barrier is at least partially also an electrical barrier.
- the first partial winding an underlay ⁇ voltage winding and a second partial winding is a high-voltage winding.
- the two windings are concentric with one another and, for example, also arranged to a core section extending through the inner low-voltage winding.
- the electrical device ge ⁇ Mäss this embodiment of the invention is a transformer with concentric upper and lower voltage windings as part windings.
- the partial windings are advantageously out as circumferentially closed cylindrical windings out ⁇ .
- a first cooling unit for cooling the low-voltage winding and a second cooling unit for cooling the high-voltage winding are set up.
- the cooling device it is expedient here for the cooling device to act on the high-voltage winding with colder insulating fluid, so that it can be operated at lower temperatures.
- the low-voltage winding and the high-voltage winding are then in turn equipped with different insulating materials as partial winding insulation, which can withstand the differentderaumtempera ⁇ acids.
- the cooling chambers are hydraulically coupled to one another within the scope of the invention.
- the cooling chamber in which the high-voltage winding is arranged, connected with the cooling space in which the low-voltage winding is disposed about an expansion vessel hyd ⁇ raulisch each other.
- a cooling unit is designed as a closed circulating cooling system in which a pump to circulate the order ⁇ isolator is provided.
- a seconddeein ⁇ integrated is connected to the interior of the vessel, wherein the first cooling unit and the interior of the electrical device are connected to each other only via an expansion vessel.
- a hydraulic connection of the Cooling rooms exclusively via the expansion tank instead which is mandatory anyway due to the temperature-dependent volume expansion of the insulating fluid.
- the gaps between the individual barriers and between the winding and the vessel, which are not required for cooling or for guiding the insulating fluid can be closed by means of inserts to avoid bypasses.
- the cooling device has a feed ⁇ circuit which forms a part below the first winding and in particular below the high-voltage winding angeord- designated exit opening.
- the cooled insulating fluid exits the cooling device via the supply line and is introduced directly into the cooling space of the first part winding, so that the first part winding is cooled more than the other part windings, the first part winding in the flow direction of
- Isolating fluids are arranged downstream.
- At least one cooling unit is connected to the winding substructure and / or winding superstructure of a sub-winding such that the flows of the insulating fluid guided in each case via the cooling units during normal operation are separated from one another.
- each cooling unit has at least one cooling register.
- the term cooling register should also include radiators here.
- At least one or each cooling unit may be a passive cooling unit or may include a recirculation pump for circulating the insulating fluid over a cooling register.
- the cooling coil can be equipped with one or more fans or fans.
- the cooling registers are connected to the vessel of the electrical appliance in such a way that these have different vertical distances to a defined by the bottom ⁇ surface of the vessel bottom surface.
- the cooling coils are mounted at different heights on the vessel.
- the cooling units are passive cooling units and have no circulating pump.
- the circulation rate of the insulating fluid via the cooling register is determined by the height offset between the center of the hot fluid column in the cooling passages of the respective part winding and the center of the cold fluid column of the respective cooling register.
- the sectionwicklun- gene different insulation.
- beispielswei ⁇ se a first partial winding a high-temperature insulation
- a second partial winding and all other partial windings have customary insulation of materials which are designed for lower temperatures.
- isolation here also includes barrier systems and Abstandshal ⁇ ter, which are used in addition to the insulation of the winding conductor.
- Further components of the electrical device for example tap changers, are assigned to one of the two cooling circuits flowing through the cooling chambers in accordance with their respective permissible operating temperature.
- the cooling device has a control unit with temperature sensors, wherein the temperature sensors for detecting the temperature of a partial winding and / or for detecting the temperature of the insulating fluid are arranged in a partial winding.
- the control unit is included For example, for each cooling unit with a threshold from ⁇ equipped, so that the cooling capacity of the respective cooling unit is controllable in dependence of the respective threshold value.
- the respective threshold is depending on the temperature resistance of the insulating materials of the partial windings be ⁇ true. Detected by the temperature sensors temperature reaches the threshold value, the control unit controls ent ⁇ either a circulation pump or a fan of the respective cooling unit and thus increases the cooling capacity of said cooling unit.
- the temperature sensors are set up to detect the temperature of a partial winding and / or to detect the temperature of the insulating fluid.
- the temperature sensors can therefore also detect the temperature of the winding conductor directly within the scope of the invention.
- At least one Operawick ⁇ ment has a plurality of temperature ranges in which insulating materials of different thermal capacity are arranged. This may be advantageous when insulating materials with lower thermal resistance are arranged in each upstream Temperartur Scheme than in downstream temperature ⁇ tur Schemeen that reciprocates in the direction of flow of the Isolierfluide ter are the upstream temperature range.
- a temperature sensor for measuring a hot-spot temperature is arranged in at least two temperature ranges, which on the output side provides temperature readings which are compared with a predetermined threshold value depending on the insulators used in the respective temperature range, based on this comparison Control signal is generated. Depending on the design, this can trigger a warning signal, cause the shutdown, trigger a reduction in the load of the electrical device or be used to control the cooling system.
- the operation at higher temperatures he ⁇ allows, with a costly conversion, for example, the insulating material-rich winding parts of a high-voltage winding ⁇ can be omitted on Hochtemperaturisolierwerkstoffe.
- the high temperature spread of the insulating fluid enables the effective use of external evaporative coolers and radiators based on heat pipes.
- a plurality of fluidly connected temperature ranges in the cooling chamber with sensors to measure the hot spot temperature of the winding element are fitted in the respective temperature range, wherein the signals of each of these temperature sensors each have their own thresholds for triggering control functions are assigned to which the thermi ⁇ specific class of each in the Temperature ranges of the partial winding used insulating materials are matched.
- Figures 1 to 7 show differentieresbeispie- le of the electrical device according to the invention in a partially ge ⁇ cut side view schema ⁇ table.
- Figure 1 shows a first embodiment of the fiction, ⁇ contemporary electrical device 1 in a sectional side view, wherein the electrical device is performed as a transformer 1 ⁇ .
- the transformer 1 has a vessel 14 in which a magnetizable core 2, a low-voltage winding 3.1 and a high-voltage winding 3.2 are each arranged as a partial winding in the context of the invention concentric with each other.
- the said windings 3.1, 3.2 are designed hollow cylinder ⁇ .
- the high-voltage winding 3.2 can be connected to a high-voltage network via a connection, which is not shown in the FIGURE, wherein the low-voltage winding 3.1 can be connected to a distribution network or a load via a connection line, likewise not shown.
- the upper and lower voltage winding 3.1, 3.2 are inductively coupled to each other via the magnetizable core 2, so that the high-voltage winding 3.2 in the low-voltage winding 3.1 induces a voltage or vice versa.
- the vessel 14 is provided with an isolator 30 and filled in the vorlie ⁇ constricting case a commercially available ester.
- a thermal barrier 4 is arranged between the high-voltage winding 3.2 and the low-voltage winding 3.1.
- the thermal barrier 4 is circumferentially closed and also formed as a hollow cylinder. They also encloses the zy ⁇ -cylindrical low-voltage winding 3.1 completely.
- an expansion vessel 18 is arranged, which serves to accommodate the temperature-induced volume fluctuations of the insulating fluid 30.
- a cooling device For cooling the partial windings 3.1 and 3.2, a cooling device is provided which has two cooling units, wherein a first cooling unit has a cooling register 15.1, a Um Strukturpum ⁇ PE 16.1 and a temperature sensor 22.1, a supply line 37.1 and a return line 38.1.
- the second cooling unit has a cooling register 15.2, a circulation pump 16.2, a temperature sensor 22.2, a supply line 37.2 and a return line 38.2.
- the supply line 37.1 has an outlet opening 32, which is arranged below the radially inwardly located lower voltage winding 3.1.
- An inlet opening of the return line 38.1 is connected directly to a winding superstructure 9.1 of the winding 3.1.
- the winding superstructure 9.1 is fluidically sealed, this means that the flow of the insulating fluid 30 is guided by the winding superstructure .
- the return line 38.1 is connected via a connecting line with the expansion vessel 18, which in turn ⁇ is connected via a second connecting line to the interior of the vessel 14 of the transformer 1.
- the supply line 37.2 of the second cooling unit opens with its
- the return line 38.2 is connected near the top of the vessel.
- a first cooling space is limited, in which the lower voltage winding 3.1 is arranged.
- the outer wall of the thermal barrier ⁇ 4 limits together with the vessel 14 a second cooling space in which the high-voltage winding is 3.2.
- the insulating fluid 30 cooled by the first cooling unit 15.1, 16.1, 37.1, 38.1 is led directly to the low-voltage winding 3.1 via the sealed winding substructure 8.1 and from there directly to the cooling register 15.1.
- the hydraulic coupling of the cooling chambers takes place only via the expansion vessel 18. Different cooling chamber temperatures are set in the cooling chambers.
- Insulations are adapted to these refrigerator temperatures.
- the temperature sensors 22.1 and 22.2 are each connected to a control unit not shown figuratively via a signal line. Detected by the temperature sensors 22.1 and 22.2 temperature of the isolator fluid 30 exceeds a previously set for the respective partial winding 3.1 or 3.2 threshold, the control unit increases the output of the circulating pump and thus the performance of the jeweili ⁇ gen cooling unit.
- the threshold values were determined as a function of the thermal class of the insulating materials of the respective partial windings.
- FIG. 2 shows an exemplary embodiment of the electrical device 1 according to the invention, in which the hydraulic coupling of the cooling circuits takes place via the upwardly open winding superstructures 9.1, 9.2 of the partial windings 3.1, 3.2. It comes above the partial windings 3.1 and 3.2 to a mixture of the insulating fluid 30. In each of a partial winding 3.1, 3.2 associated cooling units, the insulating fluid 30 is cooled differently. Thus, in the cooling circuit for the part winding 3.2 whose winding conductors are equipped with a complex high-voltage insulation, a higher cooling costs be ⁇ driven. In other words, the insulating fluid 30 is cooled to a lower temperature.
- the cooling space of the partial winding 3.1, and the core 2 are included in the cooling circuit formed over the radiator 15.2.
- the partial winding 3.1 with lower requirements for their dielectric strength which thus has a small proportion of insulating materials compared to the other partial winding, is equipped with an insulation of a higher thermal class and can thus be operated at a higher temperature.
- the equipment of this part winding with high temperature insulation materials requires little cost.
- the design of the core 2 to higher temperatures requires only a very small effort, since no moldings are required and an electric field stress must not be taken into account. Accordingly, the core 2 is just ⁇ if exposed to higher operating temperatures.
- the respective layered winding substructure 8.1, 8.2 is used for separate supply of the insulating fluid 30 to the separated by the thermal barrier part windings
- the winding substructures 8.1 and 8.2 are sealed against each other. Furthermore, at least one connecting line 37.1 is provided, which extends between the cooling unit 15.1, 16.1 and the winding substructure 8.2, so that the flow of the cooled insulating fluid is sealed relative to the interior of the vessel 14.
- the cooling coil 15.1 is connected via a pipe 37.1 directly to the winding substructure 8.2.
- the spaces 40 not required for cooling or for guiding the insulating fluid 30 between the partial windings 3.2 and the vessel 14 are closed by means of supplements 11.2 in order to avoid bypasses.
- FIG. 3 shows a further exemplary embodiment of the invention with two cooling chambers separated by the thermal barrier 4.
- the thermal barrier 4 comprises cylindrical Abschnit ⁇ te 4.1 and 4.2 and a partition 4.5.
- the thermal barrier 4 made of a thermally insulating material causes thermal and fluidic decoupling of lie radially outside ⁇ part winding 3.2 of the inner part winding 3.1, and the core 2 of the transformer 1.
- the decoupling is in other words by the separation of Isolierfluidströme both cooling circuits by means of the thermal barrier 4 achieved.
- an electric Barrie ⁇ re 7 is integrated as a section in the barrier 4.
- the winding base 8.2 of the partial winding 3.2 is fluidically connected to the feed line 37.2 which of the outside
- Vessel arranged radiator register 15.2 of the second cooling unit leads.
- the radially inner part of the winding 3.1 and the cooling channels of the core 2 are open to the fluid space of the vessel 14.
- the supply conduit 37.1 of the first cooling register 15.1 is connected at a level below the lower edge of the partial winding ⁇ 3.1 with the vessel fourteenth
- the inner part-winding 3.1, and the core 2 are thus fed by "free" so not guided flow with chilled iso ⁇ lierfluid 30th
- Each sub-winding not only has a winding base 8.1 or 8.2 over a Wick ⁇ lung superstructure 9.1, 9.2.
- Each winding superstructure 9.1 and 9.2 is open to the fluid space of the vessel 14. Through the openings of their winding superstructure 9.1, 9.2 in the embodiment, both cooling chambers on the inside of the vessel so the fluid space of the vessel 14 are hydraulically connected to each other.
- the interior of the vessel 14 and thus both cooling chambers are connected to the expansion vessel 18.
- the thermal stratification of the insulating fluid 30 due to the temperature dependence of the density of the insulating fluid 30.
- This thermal stratification is characterized by a high viscosity. reinforced insulating fluid used 30 and the very low flow rates in the large cross-section. In the specific embodiment, this effect is used for thermal separation of the two cooling circuits.
- the arrangement of the terminal according to the invention is characterized by a high viscosity. reinforced insulating fluid used 30 and the very low flow rates in the large cross-section. In the specific embodiment, this effect is used for thermal separation of the two cooling circuits.
- a further section 4.5 of the thermal barrier 4 is provided in the usually open area above the windings. This section 4.5 projects beyond the electrical barrier 7.
- the vertical distance H5 from the upper edge of the section 4.5 of the thermal barrier 4 to the return line 38.2 is a multiple of the flow limiting
- potential unwanted flow channels 10.5, for example, between sections 7.5 of the barrier system 4 and the electrical barrier 7 are completely or partially closed at one of their ends by inserts made of insulating material.
- the partial windings form 3.1 and 3.2 vertically superposed inside refrigerators temperature ranges 5.1, 5.2, 5.3 or 6.1, 6.2, which are equipped with electrical insulation from insulating materials having a different of Temperaturbe ⁇ rich to temperature range thermal Be ⁇ bearing capacity exhibit.
- the thermal load capacity of the insulating materials in the temperature range 5.1 which is first flowed through by the insulating fluid 30, is lower than the insulating materials of the downstream temperature ranges.
- at least partially insulating materials can also be rather thermal classes are used.
- the thermal capacity of an insulating material may be lower, if it adheres to the hottest point of the temperature range so ⁇ example, to a certain winding position the necessary distance.
- a gradation of thermal class take place, depending on whether the insulating material is used as a conductor Isola ⁇ tion, spacers, or potential control ring barrier.
- This arrangement is applicable to a variety of insulating materials and there ⁇ with different temperature ranges.
- An exemplary assignment of the thermal classes to the temperature ranges shown in the exemplary embodiment is given below.
- an insulating fluid based on an ester is used.
- spacer is intended here to encompass radial and axial spacers, such as, for example, strips, riders, intermediate layers or the like
- barrier system is intended to include barriers, angle rings, caps, disks, insulating cylinders or the like.
- the staggering of the thermal performance of insulating materials can also be carried out within the thermal classes according to EN 60085, there are a variety of possibilities, for example, a staggering in differences smaller than 10K is possible.
- the hot points of the Tem ⁇ ranges shown are equipped with thermal sensors 25.1, 25.2, 25.3, 26.1, 26.2, which are each connected to a not illustrated figuratively control unit in the embodiment.
- a sensor 27, 28 for measuring the maximum temperature of the insulating liquid 30 is further arranged in the region of the respective outlet opening in the winding superstructure 9.1 or 9.2.
- each of which is equipped with isolating materials of 3 different thermal classes. This results in different permissible maximum temperatures for each temperature range.
- the insulating liquid 30 may not reach the permissible for the isolator maximum temperature ⁇ structure in the front is arranged in the flow path of temperature ranges ⁇ chen, otherwise the temperature gradient of the winding to the isolator 30 is too low in the perfused subsequently winding portions for adequate cooling.
- the hot points of all temperature ranges with thermal sensors equipped kitchens ⁇ tet and signals a control unit are supplied.
- Each of these signals is assigned a threshold value adapted to the thermal class of the insulating materials of the corresponding winding area.
- Exceeds one of the temperature signals ⁇ its associated threshold value is generated Steuersig ⁇ nal. Depending on the design, this can trigger a warning signal, cause the shutdown, trigger a reduction in the load of the electrical device or be used to control the cooling system.
- each temperature sensor 25.1, 25.2, 25.3, 26.1, 26.2, various threshold values fordean ⁇ attitude control, alarm and tripping be assigned.
- 4 shows a further exemplary embodiment in which a cooling unit is designed as an active cooling unit and has a circulating pump 16.2, while the other cooling unit is a passive cooling unit 15.1, in which the insulating fluid 30 circulates over the cooling register 15.1 due to a temperature difference that occurs becomes.
- the winding 3.2 with the higher high-voltage requirements that is to say the winding with a high proportion of insulating materials and insulating parts to be produced in a complex manner, is forcedly cooled by the active cooling unit 15.2, 16.2.
- the partial winding 3.2 is again enclosed by cylindrical sections 4.1 of the thermal barrier 4.
- the supply of the cooled insulating fluid 30 takes place via the fluidically sealed winding substructure 8.2 which is connected via the supply line 37.2 to the cooling unit 15.2 and the pump 16.2.
- the vessel 14 is further connected to the cooling register 15.1.
- the more cooled part winding 3.2 is provided with insulating materials of a low thermal class. Since the operation of a shown Transformtors 1 large differences in the temperatures of the insulating fluid 30 set inside and outside the thermal barrier 4, are additional
- Barrier sections 4.6 provided that avoid fluid flow directly to the wall of the barrier 4.2 and thus reduce the thermal influence of the partial winding 3.2.
- the barrier sections 4, 4 are provided with electrical inserts and angle rings directly following the barriers, which prevent fluid flow within the channel between the barriers.
- Figure 5 illustrates an embodiment of a transformer 1 with natural cooling (ONAN cooling).
- ONAN cooling natural cooling
- the windings of the part 3.1, 3.2 iso- heated lierfluid 30 rises due to its lower density compared ⁇ over the insulating liquid 30 of the wider area of the winding and will be replaced by incoming cold Angle Iso ⁇ lier complexkeit 30th
- the difference in weight between the warm liquid column in the winding channels and the colder liquid column in the cooling register 15.1 or 15.2 creates a pressure difference which serves as a driving force for the fluid circuit.
- a higher geometric arrangement of the cold insulating fluid column of the cooling ⁇ registers leads to an increase in the coolant flow driving pressure difference.
- This effect is used in the embodiment to supply a winding 3.1 with an increased pressure and thus a higher volume flow of the insulating liquid.
- the cooling coil 15.1 wel ⁇ ches the winding 3.1 supplied with cooled insulating fluid, arranged at a greater distance from the center of the winding 3.1, as the cooling coil 15.2, which is provided to supply the part winding 3.2 and the core 2.
- This height offset is described here - on the basis of the fixed distance of the partial winding to a bottom plane defined by the bottom of the vessel - by the distance between the respective cooling register and said bottom plane.
- These different altitudes are therefore considered here as a vertical distance Hl, H2 of the respective cooling register 15.1, 15.2 to the ground plane, which is defined by the bottom of the vessel 14.
- Hl is greater than H2. Since both partial windings 3.1 and 3.2 are supported on the lower yoke of the core 4, their centers are approximately the same height. As a result, the distance between the center of the first radiator 15.1 and the center of the first winding 3.1 is greater than the distance between the center of the second radiator 15.2 and the middle of the second winding 3.2. If this driving force is too high, then due to the flow resistance in the winding, there is a strong secondary flow of the insulating fluid 30 between the partial winding and the vessel wall of the transformer 1, which lowers the effectiveness of the cooling.
- the supply of the cooled insulating fluid 30 to the winding 3.1 connected to the higher-level cooling unit 15.1 is effected via the winding substructure 8.1 fluidically sealed for this purpose.
- the Isolierfluidströmung is adapted to the different operating temperatures of the two partial windings and their different flow resistance.
- the cooling registers 15.1 and / or 15.2 can be equipped with fans in the context of the invention.
- FIG. 6 shows a further embodiment of the OF INVENTION ⁇ to the invention the electric appliance 1, which then differs from that shown in Figure 5 embodiment in that the cooling coils are equipped with fans or blowers 17 15.1 and 15.2.
- the cooling register 15. 1 and the cooling register 15. 2 have a different number of fans 17.
- the cooling coils are 15.1 and 15.2 at the same height.
- the supply line 37.1 of the first cooling unit is located just below the first partial winding 3.1, that is, the low-voltage winding.
- the thermal barrier 4 extends in contrast to the embodiments shown in Figures 1 to 5 to the upper wall of the vessel 14, wherein the return line 38.1 the cooling space inside the thermal barrier 4 with the cooling coil
- the first cooling unit forms again ei ⁇ NEN closed circulating cooling circuit, wherein the hyd ⁇ raulische coupling between the first cooling chamber and the two th refrigerator, which is defined by the outer wall of the thermal barrier 4 and the inner wall of the vessel 14, via the expansion vessel 18 takes place.
- the corresponding connecting lines are provided.
- both cold rooms are each equipped with its own Buchholz relay 20 to monitor gas accumulation in both cold rooms.
- the temperatures in both partial windings 3.1, 3.2 increase differently and are initially cooled without fan assistance (ONAN cooling).
- the fans 17 are switched on or controlled differently for each cooling circuit at different temperatures for both subsystems.
- the cooling unit for the cooling chamber with the partial winding which is equipped with insulating materials of a lower thermal class, already switched at ei ⁇ ner lower temperature fan operation, as the cooler for the partial winding with insulating materials of a higher thermal class.
- the cooling register has
- FIG 7 shows a further embodiment of the invention of the electrical device 1 according to the invention, which substantially corresponds to the embodiment of Figure 1, but wherein the cooling units 15.1 and 15.2 are each designed as passive cooling units, so that the cooling units depending Weil ⁇ no circulating pump.
- components of the electrical device 1 are accordingly their respective permissible operating temperature assigned to one of the two refrigerated rooms.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformer Cooling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016219406.2A DE102016219406A1 (de) | 2016-10-06 | 2016-10-06 | Elektrisches Gerät mit mehreren Kühleinheiten |
PCT/EP2017/073249 WO2018065189A1 (de) | 2016-10-06 | 2017-09-15 | Elektrisches gerät mit mehreren kühleinheiten |
Publications (2)
Publication Number | Publication Date |
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EP3494584A1 true EP3494584A1 (de) | 2019-06-12 |
EP3494584B1 EP3494584B1 (de) | 2020-10-28 |
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EP17772346.7A Active EP3494584B1 (de) | 2016-10-06 | 2017-09-15 | Elektrisches gerät mit mehreren kühleinheiten |
Country Status (4)
Country | Link |
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US (1) | US11322287B2 (de) |
EP (1) | EP3494584B1 (de) |
DE (1) | DE102016219406A1 (de) |
WO (1) | WO2018065189A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102018112003A1 (de) * | 2018-05-18 | 2019-11-21 | Maschinenfabrik Reinhausen Gmbh | Zustandsanalyse eines induktiven betriebsmittels |
CN118412208A (zh) * | 2024-06-28 | 2024-07-30 | 大连彬理电力科技有限公司 | 一种防止短路的变压器绕组结构 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2479373A (en) * | 1943-10-27 | 1949-08-16 | Westinghouse Electric Corp | Cooling system for electrical apparatus |
US3144770A (en) * | 1961-01-30 | 1964-08-18 | Gen Electric | Means for determining an internal condition in electrical apparatus |
US3371299A (en) * | 1966-02-10 | 1968-02-27 | Westinghouse Electric Corp | Transformer apparatus cooling system |
JPS4970135A (de) * | 1972-11-10 | 1974-07-06 | ||
JPS55145315A (en) * | 1979-04-27 | 1980-11-12 | Daihen Corp | Forced oil type transformer |
CN2144881Y (zh) | 1992-09-29 | 1993-10-27 | 杨开春 | 双单元移动变电站 |
JP2853505B2 (ja) | 1993-03-19 | 1999-02-03 | 三菱電機株式会社 | 静止誘導機器 |
DE19701269A1 (de) * | 1997-01-16 | 1998-07-23 | Ask Antriebs Steuerungs Und In | Transformator mit Flüssigkeitskühlung |
US6494617B1 (en) * | 1999-04-30 | 2002-12-17 | General Electric Company | Status detection apparatus and method for fluid-filled electrical equipment |
CN101355238B (zh) | 2008-09-19 | 2011-12-07 | 沈阳福林特种变压器有限公司 | 一种车载移动变电站 |
US8928443B2 (en) | 2012-05-17 | 2015-01-06 | Elwha Llc | Electrical device with emergency cooling system |
EP2833378B1 (de) * | 2013-07-31 | 2016-04-20 | ABB Technology AG | Wandler |
-
2016
- 2016-10-06 DE DE102016219406.2A patent/DE102016219406A1/de not_active Ceased
-
2017
- 2017-09-15 WO PCT/EP2017/073249 patent/WO2018065189A1/de unknown
- 2017-09-15 US US16/340,263 patent/US11322287B2/en active Active
- 2017-09-15 EP EP17772346.7A patent/EP3494584B1/de active Active
Also Published As
Publication number | Publication date |
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US11322287B2 (en) | 2022-05-03 |
US20190318862A1 (en) | 2019-10-17 |
EP3494584B1 (de) | 2020-10-28 |
WO2018065189A1 (de) | 2018-04-12 |
DE102016219406A1 (de) | 2018-04-12 |
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