A method for determining temperature information or temperature-related information associated with a static inductor assembly.

Abstract

This invention relates to a method for determining temperature information or information related to temperature information in relation to a static induction device assembly (10). The static induction device assembly (10) has a vertical extension along the vertical direction (z). The method includes performing the following for the static induction device portion (20): - determining a heat loss value (Q), which indicates the heat loss of the static induction device portion (20), the static induction device portion (20) having a vertical static induction device portion position (z) along the vertical direction (z). port - Determine the liquid temperature value (T) liq (z port The liquid temperature value indicates the position of the vertical static inductive device (z). port The temperature of the liquid (16) in the liquid, and - using the liquid pressure difference (Δp), heat loss value (Q) and liquid temperature value (T) liq (z port To determine the temperature (T) of the static induction device section (20) port (or information related to temperature.)

Description

Technical Field

[0001] This invention relates to a method for determining temperature information or information related to temperature information in connection with a static inductive device assembly. Furthermore, this invention relates to each of a computer program product, a non-transitory computer-readable storage medium, and a control unit. Background Technology

[0002] In static inductance device assemblies (such as assemblies including transformers and / or shunt reactors), it is generally desirable to determine the temperature of at least a portion of the static inductance device that forms part of such an assembly.

[0003] To illustrate purely, it is desirable to determine the so-called hot spot temperature of a static inductor. A hot spot typically refers to at least one of the hottest parts of a static inductor. Information related to the hot spot temperature may be relevant, for example, when assessing the insulation aging of a static inductor.

[0004] However, measuring the temperature in the desired part of a static inductive device can be challenging. For example, if a temperature sensor (such as a thermometer) is placed at or near a hot spot, there is a risk that the presence of such a temperature sensor may impair the cooling of the hot spot, for example, by impairing the flow of coolant around the hot spot. Summary of the Invention

[0005] In view of the above, the object of a first aspect of the present invention is to determine temperature information related to a static inductive device assembly in a straightforward manner. This object is achieved by the method according to claim 1.

[0006] Therefore, a first object of the present invention relates to a method for determining temperature information or information related to temperature information in connection with a static induction device assembly. The static induction device assembly has a vertical extension in the vertical direction.

[0007] The static inductor assembly includes a housing, a static inductor, and a liquid, wherein the housing contains the static inductor and the liquid such that the static inductor is at least partially, preferably completely, immersed in the liquid. The static inductor includes a portion of the static inductor immersed in the liquid. The static inductor assembly further includes an enclosure member.

[0008] The static induction device is at least partially enclosed by an enclosure member, wherein at least one cooling conduit is formed between the static induction device and the enclosure member, and / or wherein the at least one cooling conduit extends at least partially through the static induction device. The at least one cooling conduit is at least partially defined by the static induction device. The at least one cooling conduit includes a lower inlet and an upper outlet as seen in a vertical direction, wherein each of the lower inlet and the upper outlet is in fluid communication with a liquid. The at least one cooling conduit is adapted to convey liquid from the lower inlet to the upper outlet.

[0009] The method includes: determining the liquid pressure difference between the liquid pressure at the upper outlet and the liquid pressure at the lower inlet. The method includes: performing at least the following for the static inductive device portion:

[0010] - Determine the heat loss value, which indicates the heat loss of the static induction device portion, which has a vertical static induction device portion position along the vertical direction.

[0011] - Determine the liquid temperature value, which indicates the temperature of the liquid at a specific location of the vertical static inductive device, and

[0012] - Use liquid pressure difference, heat loss value, and liquid temperature value to determine the temperature of the static induction device section or information related to temperature.

[0013] The above suggests that the temperature of the static inductor portion can be determined in a straightforward manner. For example, the method described above implies that the temperature of the static inductor portion can be determined without using a temperature sensor located at or near the static inductor portion.

[0014] Optionally, the method includes: determining a temperature profile indicating the temperature of the liquid inside the housing but outside the enclosure at a plurality of different vertical positions between an upper outlet vertical position at the upper outlet and a lower inlet vertical position at the lower inlet.

[0015] The temperature profiles described above can be useful when determining information such as temperature or temperature-related information about a portion of a static induction device. Furthermore, since the temperature profiles indicate the temperature outside the enclosure, they can be determined where the risk of negatively impacting, for example, the flow of liquid around the static induction device portion is low.

[0016] Optionally, the step of determining the liquid temperature value includes: using a temperature profile and the position of the static induction device portion along the vertical direction.

[0017] The above suggests that the liquid temperature can be determined in a straightforward manner.

[0018] Optionally, defining the characteristics of the temperature profile includes using multiple temperature sensors arranged inside the housing but outside the enclosure between the upper outlet vertical position and the lower inlet vertical position.

[0019] The use of multiple temperature sensors arranged outside the enclosure suggests a reasonably low risk that the temperature sensors may impair the flow of liquid around the static induction device.

[0020] Optionally, the characteristics of the temperature profile include the following:

[0021] - A measuring component is used to determine the measured temperature data, which includes the temperature at each of a plurality of different locations of the static induction device assembly as a function of time within at least a portion of a reference time range when the static induction device assembly is in a state where at least a portion of the static induction device generates heat during at least a portion of the reference time range.

[0022] - A temperature model that generates estimated temperature data, corresponding to the estimated temperature at each of the plurality of different locations of the static inductive device assembly as a function of time, the temperature model including a learned model representing the estimated temperature data and the measured temperature data, and

[0023] -Use the measured temperature data to train a learning model, thereby obtaining a temperature model, and

[0024] - Use a temperature model to determine the temperature profile.

[0025] The above suggests a general implementation method for determining temperature profiles.

[0026] Optionally, the learning model includes a neural network, preferably a multi-layer neural network.

[0027] Optionally, the measuring component includes a fiber optic sensor located within the enclosure. Preferably, the static inductive device includes a winding, and the fiber optic sensor is at least partially located within the winding.

[0028] The use of fiber optic sensors implies accurate determination of the measured temperature data.

[0029] Optionally, the step of determining the liquid pressure difference between the liquid pressure at the upper outlet and the liquid pressure at the lower inlet includes using a temperature profile and information relating to the density of the liquid as a function of temperature.

[0030] Using temperature profiles to determine liquid pressure differentials allows for the determination of liquid pressure differentials without requiring the use of, for example, pressure sensors. Furthermore, using temperature profiles provides a suitable and accurate value for the liquid pressure differential.

[0031] Optionally, the method includes determining the fluid velocity of the liquid flowing in the pipe based on the liquid pressure difference and a factor indicating the flow resistance of the at least one cooling pipe.

[0032] The above-described methods for determining fluid flow rate can provide appropriately accurate results.

[0033] Optionally, the step of determining the heat loss value includes: determining the value of the power supplied to the static induction device section.

[0034] The heat loss value is proportional to the power supplied to the static inductor section. Therefore, by determining the value of the power supplied to the static inductor section in order to determine the heat loss value, the heat loss value can be determined with appropriate accuracy.

[0035] Optionally, the step of determining the temperature of the static induction device portion using the liquid pressure difference, heat loss value, and liquid temperature value includes: determining the heat transfer coefficient between the static induction device portion and the liquid. The heat transfer coefficient is a function of the fluid flow rate, wherein the temperature of the static induction device portion is determined as the sum of the liquid temperature value and a parameter proportional to the ratio between the heat loss value and the heat transfer coefficient.

[0036] Optionally, the static induction device includes a winding, wherein the static induction device portion is part of the winding.

[0037] Optionally, the winding includes a plurality of discs, and the method includes performing the method according to any one of the preceding claims for each of a set of discs.

[0038] Optionally, the static induction device portion is associated with the area of ​​the static induction device, which has a relatively high temperature compared to its surrounding environment.

[0039] Optionally, the liquid includes a dielectric liquid, preferably composed of such a dielectric liquid.

[0040] Optionally, the static inductive device includes a transformer and / or a shunt reactor.

[0041] The second aspect of the invention relates to a computer program product comprising program code that, when executed by a processor device, performs the method of the first aspect of the invention.

[0042] A third aspect of the invention relates to a non-transitory computer-readable storage medium comprising instructions which, when executed by a processor device, cause the processor device to perform the method of the first aspect of the invention.

[0043] A fourth aspect of the invention relates to a control unit arranged to perform the method of the first aspect of the invention. Attached Figure Description

[0044] Referring to the accompanying drawings, a more detailed description of embodiments of this disclosure, which are cited as examples, follows.

[0045] In the attached diagram:

[0046] Figure 1 This is a schematic diagram of a static inductive device assembly;

[0047] Figure 2 This is a schematic diagram of a static inductive device, and a graph showing the heat loss value and the temperature of the liquid, each of which is expressed as a function of the vertical position of the static inductive device.

[0048] Figure 3 This is a schematic illustration of a portion of an implementation of a static inductive device. Detailed Implementation

[0049] Preferred embodiments of this disclosure will be discussed below with reference to the accompanying drawings.

[0050] Figure 1 An embodiment of the static inductor assembly 10 is schematically illustrated. The static inductor assembly 10 has a vertical extension along the vertical direction z. Furthermore, as... Figure 1 As indicated, the static inductive device assembly 10 may also have extensions along the longitudinal direction x and the lateral direction y. The longitudinal direction x and the lateral direction y may form a horizontal plane.

[0051] like Figure 1 As indicated, the static inductance device assembly 10 includes a housing 12, a static inductance device 14, and a liquid 16. For example only, the housing 12 may be referred to as a tank. Furthermore, again for example only, the housing 12 may include a heat sink 18. The heat sink 18 is in fluid communication with the interior of the housing 12, allowing the liquid 16 to be conveyed through the heat sink 18, thereby cooling the conveyed liquid and returning it to the interior of the housing 12. The above capabilities are provided by... Figure 1 The arrow in the text indicates this.

[0052] In addition, such as Figure 1 As indicated, the housing 12 accommodates the static inductive device 14 and the liquid 16, such that the static inductive device 14 is at least partially, preferably completely, immersed in the liquid 16. Furthermore, as... Figure 1 As indicated, the static inductor 14 includes a static inductor portion 20 immersed in the liquid 16. Typically, and as... Figure 1As indicated, the static inductive device portion 20 is completely submerged in the liquid 16. Furthermore, as... Figure 1 As indicated in the diagram, the static inductor portion 20 has a vertical static inductor portion position z along the vertical direction z. port .

[0053] The static inductor assembly 10 further includes an enclosure member 22. At least one cooling conduit 24 is formed between the static inductor 14 and the enclosure member 22 and / or the at least one cooling conduit 24 extends at least partially through the static inductor 14. The at least one cooling conduit 24 is at least partially defined by the static inductor portion 20.

[0054] In the static inductor assembly 10 Figure 1 In one embodiment, the at least one cooling conduit 24 is formed between the static induction device 14 and the enclosure member 22. However, it is also contemplated that in other embodiments of the static induction device assembly 10, the at least one cooling conduit 24 may extend through one or more other portions of the static induction device assembly 10. As a non-limiting example, the at least one cooling conduit 24 may extend at least partially through the static induction device 14, such as at least partially through the core (not shown) of the static induction device 14.

[0055] The at least one cooling conduit 24 includes a lower inlet 26 and an upper outlet 28 as seen along the vertical direction z, wherein each of the lower inlet 26 and the upper outlet 28 is in fluid communication with the liquid 16. The at least one cooling conduit 24 is adapted to convey the liquid 16 from the lower inlet 26 to the upper outlet 28.

[0056] Furthermore, although, purely as an example, the static inductance device assembly 10 Figure 1 The implementation includes a temperature sensor assembly 30, the details of which will be discussed further below. However, it is also contemplated that other implementations of the static inductive device assembly 10 may not necessarily include the temperature sensor assembly 30.

[0057] As a non-limiting example, liquid 16 may include a dielectric liquid (such as mineral oil), preferably composed of the dielectric liquid.

[0058] Furthermore, although this is merely an example, the static inductor 14 may include a transformer or a shunt reactor, or may even be composed of a transformer or a shunt reactor.

[0059] The first objective of this invention relates to a method for determining temperature information or information related to temperature information in connection with a static inductor assembly 10. Specifically, the first objective of this invention relates to a method for determining the temperature T of the static inductor portion 20.port Or methods for providing information related to temperature.

[0060] By way of example only, the static inductor portion 20 may be associated with an area of ​​the static inductor 14 that has a relatively high temperature compared to its surrounding environment. As a non-limiting example, the static inductor portion 20 may be a so-called hot spot of the static inductor 14.

[0061] The method includes determining the liquid pressure difference Δp between the liquid pressure at the upper outlet 28 and the liquid pressure at the lower inlet 26. As a purely example, a pressure sensor could be used. Figure 1 (Not shown in the image) to determine this type of liquid pressure difference Δp. Alternatively, as will be further discussed below, information indicating the temperature of liquid 16 can be used to determine the liquid pressure difference Δp.

[0062] The method according to the first aspect of the invention comprises: performing at least the following on the static inductive device portion 20:

[0063] - Determine the heat loss value Q, which indicates the heat loss of the static induction device section 20, which has a vertical static induction device section position z along the vertical direction z. port ,

[0064] - Determine the liquid temperature value T liq (z port The liquid temperature value indicates the position z of the vertical static inductive device. port The temperature of liquid 16 in the middle,

[0065] -Use the liquid pressure difference Δp, heat loss value Q, and liquid temperature value T. liq (z port To determine the temperature T of the static induction device section 20. port Or information related to temperature.

[0066] The liquid temperature value T can be determined in several different ways. liq (z port The liquid temperature value indicates the position z of the vertical static inductive device. port The temperature of the liquid 16 in the liquid. As a non-limiting example, a single temperature sensor (such as a thermometer) can be used to determine the liquid temperature value T. liq (z port This temperature sensor is suitable for measuring the position z of a vertical static inductive device. port The temperature of liquid 16 in the solution.

[0067] However, purely by way of example, the method may include: determining a temperature profile indicating the vertical position z of the upper outlet located at the upper outlet 28, inside the housing 12 but outside the enclosure 22. upper The vertical position z of the lower entrance 26 and the lower entrance lower The temperature of the liquid 16 at several different vertical positions between them. By way of example, the temperature profile can indicate the temperature of the liquid 16 inside the housing 12 but at least 10 mm outside the enclosure member 22 (as seen in the horizontal direction in a horizontal plane formed by the longitudinal direction x and the transverse direction y).

[0068] Therefore, refer to Figure 2 The figure illustrates the temperature T of the liquid 16 in the outer casing 12 as a function of the vertical position z. liq Since colder liquids have a higher density than hotter liquids, the temperature curve indicates the increase in temperature T with increasing vertical position z. liq .

[0069] Figure 2 The temperature profiles illustrated can be used for a variety of purposes. As a non-limiting example, determining the liquid temperature value T... liq (z port The steps may include: using a temperature profile and the position z of the vertical static induction device portion 20 along the vertical direction z. port . Figure 2 The above example is indicated by the liquid temperature value T. liq (z port To illustrate, the liquid temperature T can be determined by interpolating the temperature profiles for different vertical positions. liq (z port In order to obtain the partial position z of the vertical static inductor device. port The liquid temperature value T at that location liq (z port ).

[0070] Temperature profiles can be determined in a variety of different ways. As a non-limiting example, the characteristics of determining the temperature profile include: using multiple temperature sensors arranged inside the housing 12 but outside the enclosure 22 at a vertical position at the upper outlet. upper and the vertical position z of the lower entrance lower between.

[0071] Therefore, refer to again Figure 1 The illustration shows an embodiment of a static inductive device assembly 10 including a temperature sensor assembly 30. Figure 1The temperature sensor assembly 30 includes multiple temperature sensors 32, 34, 36, 38, and 40, which are located at the vertical position of the outlet. upper and the vertical position z of the lower entrance lower At different vertical positions between them. As a non-limiting example, each of temperature sensors 32, 34, 36, 38, and 40 can be any of the following types of sensors: thermocouple, thermistor, resistance thermometer, and fiber optic temperature sensor.

[0072] As a non-limiting example, the temperature sensor assembly 30 may include an elongated member 41, such as a rod, to which each of the temperature sensors 32, 34, 36, 38, 40 is attached. Purely by way of example, the elongated member 41 may be made of an insulating material.

[0073] By way of example only, the temperature sensor assembly 30 may be located outside the enclosure member 22 such that the minimum distance between the enclosure member 22 and the temperature sensor assembly 30 (as seen in the horizontal direction in a horizontal plane formed by the longitudinal direction x and the transverse direction y) is at least 10 mm. A distance of at least 10 mm may be used for any embodiment of the invention.

[0074] However, it should be noted that the temperature profile does not need to be determined using temperature sensors 32, 34, 36, 38, and 40 as indicated above.

[0075] Therefore, although, purely exemplified, the characteristics of a temperature profile may include the following:

[0076] -Use measurement components (42, see...) Figure 2 To determine the measured temperature data, the measured temperature data includes the temperature at each of a plurality of different locations of the static induction device assembly as a function of time within at least a portion of a reference time range when the static induction device assembly is in a state where at least a portion of the static induction device generates heat during at least a portion of the reference time range.

[0077] - A temperature model that generates estimated temperature data, corresponding to the estimated temperature at each of the plurality of different locations of the static inductive device assembly as a function of time, the temperature model including a learned model representing the estimated temperature data and the measured temperature data, and

[0078] -Use the measured temperature data to train the learning model, thereby obtaining the temperature model.

[0079] - Use a temperature model to determine the temperature profile.

[0080] As a non-limiting example, the learning model may include a neural network (not shown), preferably a multi-layer neural network.

[0081] To illustrate this purely, using a learning model that includes neural networks to determine the characteristics of a temperature curve can be achieved by using the learning model to solve partial differential equations, such as the partial differential equations presented below:

[0082]

[0083] in:

[0084] T = T(x,t) represents the temperature at each of the multiple different positions (x) in the liquid 16 as a function of time (t);

[0085] D(T) represents the temperature-dependent material properties of at least a portion of the outer casing 12, such as thermal conductivity, and

[0086] q(I(t),T) represents the heat generated by the static induction device 14.

[0087] It should be noted that the partial differential equation above according to Equation 1 is merely an example of a partial differential equation that can be used to determine the temperature model of the estimated temperature data. In other embodiments for determining the temperature profile, the partial differential equation may include more terms, such as, for example, additional source terms. As a non-limiting example, additional source terms may be related to heat losses through the walls of housing 12 and / or stray losses in the metal portion of the static induction device 14.

[0088] refer to Figure 2 The measuring component 42 may include an optical fiber sensor located within the enclosure member 22. Preferably, the static inductive device includes a winding ( Figure 2 (Not shown), and the fiber optic sensor is at least partially located in the winding. Alternatively, as a non-limiting example, the measuring component 42 may include a temperature sensor (not shown) for measuring the temperature of the liquid 16 in one or more locations within the housing 12 (such as the uppermost location of the housing 12). As another non-limiting alternative, the measuring component 42 may include a temperature sensor adapted to measure the ambient temperature of the housing 12. Furthermore, purely by way of example, the measuring component 42 may include a thermal imager (not shown) adapted to capture a thermal image of the exterior of the housing 12 or a thermocouple attached to the exterior of the housing 12. Purely by way of example, the measuring component 42 may include one or more of the examples presented above.

[0089] Regardless of how the temperature profile has been determined, the step of determining the liquid pressure difference Δp between the liquid pressure at the upper outlet 28 and the liquid pressure at the lower inlet 26 may include using the temperature profile and information related to the density of the liquid as a function of temperature.

[0090] To illustrate purely, the liquid pressure difference Δp can be determined using the following formula:

[0091]

[0092] in:

[0093] g is the acceleration due to gravity, and

[0094] δ(z) = δ(T(z)) is the density of the liquid as a function of its temperature.

[0095] Furthermore, the method of the first aspect of the present invention may include: determining the fluid velocity of the liquid flowing in the pipe based on the liquid pressure difference Δp and a factor k indicating the flow resistance of the at least one cooling pipe.

[0096] As a non-limiting example, the fluid velocity can be the volumetric flow rate Q. v (For example, expressed in terms of volume per unit time, such as m) 3 / s), which can be determined according to the following formula:

[0097]

[0098] The exponent n is in the range of 0.5-1 (such that 0.5≤n≤1), and the value of the exponent n depends on the implementation of the cooling pipe 24. As a non-limiting example, when the cooling pipe 24 is a straight single pipe, the exponent n can be equal to 0.5, and for two parallel pipes, the exponent n can be close to or even equal to 1.

[0099] Regarding the heat loss value Q indicating the heat loss of the static inductor section 20, the step of determining the heat loss value Q may include: determining a value P indicating the power fed to the static inductor section 20. Purely by example, the value P indicating the power fed to the static inductor section 20 may be expressed as the actual power fed relative to the power fed to the static inductor section 20 (e.g., expressed in W or kW). As another non-limiting alternative, the value P indicating the power fed to the static inductor section 20 may be expressed as the current component I (e.g., expressed in A) of the actual power fed to the static inductor section 20. The latter example may use the assumption that the voltage U is known, and possibly even fixed.

[0100] Figure 2 The figure shows the curve of heat loss Q as a function of vertical position z.

[0101] To illustrate purely, the curve of the heat loss value Q can be determined by determining the value P of the power supplied to the static inductor 14. For example, it can be seen from... Figure 2It is understood that the heat loss value Q at the top and bottom vertical parts of the static induction device 14 can be greater than the heat loss value Q at the center vertical part of the static induction device 14.

[0102] also, Figure 2 The heat loss value Q and temperature curves indicate that the portion of the static inductor associated with the area of ​​the static inductor (which has a relatively high temperature compared to its surroundings) is often found in the uppermost vertical portion of the static inductor 14. This is because the uppermost vertical portion is associated with a relatively high heat loss value Q and a relatively high liquid temperature. Therefore, the relatively hot liquid at the uppermost vertical portion of the static inductor 14 can only cool that portion to a limited extent, thereby making the uppermost vertical portion of the static inductor 14 relatively hot. Consequently, any hot spots in the static inductor 14 are typically found in the uppermost portion of the static inductor 14.

[0103] As a non-limiting example, the liquid pressure difference Δp, heat loss value Q, and liquid temperature value T are used. liq (z port To determine the temperature T of the static induction device section 20. port The steps may include: determining the heat transfer coefficient h between the static induction device portion 14 and the liquid 16.

[0104] The heat transfer coefficient h is the fluid velocity Q v The function. For example, the current fluid velocity Q could be used. v A lookup table is used to determine the value of the heat transfer coefficient h. As a non-limiting example, such a lookup table may depend on the material of the static induction device section 20. The temperature T of the static induction device section 20 is also considered. port The liquid temperature value T was determined. liq (z port The sum of the parameters, which are proportional to the ratio between the heat loss value Q and the heat transfer coefficient h.

[0105] As a non-limiting example, the temperature T of the static induction device section 20 can be determined according to the following formula. port :

[0106]

[0107] Factor A can indicate the cooling surface area of ​​the static inductor section 20.

[0108] The static inductor 14 can be implemented in a variety of different ways. (See reference) Figure 3Although, purely by way of example, a static inductor may include a winding 44, wherein the static inductor portion is part of the winding.

[0109] In fact, in the static inductance device 14 Figure 3 In this embodiment, the winding 44 includes a plurality of discs 46, 48. Furthermore, as... Figure 3 As indicated, the liquid may be adapted to flow from the lower inlet 26 and the upper outlet 28, and thus through one or more sides of each of the plurality of discs 46, 48. In the static induction device 14 Figure 3 In this embodiment, the hot spot of the static inductor 14 can be associated with the uppermost disk 46. Therefore, in Figure 3 In one embodiment, the static induction device portion 20 may form part of the uppermost disk, or be equivalent to the uppermost disk.

[0110] However, in other embodiments of the first aspect of the invention, the method may include: determining the temperature of each of a set of the plurality of disks 46, 48.

[0111] The second aspect of the invention relates to a computer program product comprising program code that, when executed by a processor device, performs the method of the first aspect of the invention.

[0112] A third aspect of the invention relates to a non-transitory computer-readable storage medium comprising instructions which, when executed by a processor device, cause the processor device to perform the method of the first aspect of the invention.

[0113] Furthermore, it should be noted that the fourth aspect of the present invention relates to a control unit 50 (see...) Figure 1 The control unit 50 is arranged to perform the method of the first aspect of the invention. For this purpose, although purely illustrative, the control unit 50 may be adapted to receive information from one or more portions of the static inductive device assembly 10. As a non-limiting example, see reference to... Figure 1 In one embodiment, the control unit 50 may be adapted to receive information from the temperature sensor assembly 30.

Claims

1. A method for determining temperature information associated with a static inductive device assembly (10), the static inductive device assembly (10) having a vertical extension along a vertical direction (z), The static induction device assembly (10) includes a housing (12), a static induction device (14), and a liquid (16), wherein the housing (12) houses the static induction device (14) and the liquid (16) such that the static induction device (14) is at least partially immersed in the liquid (16), wherein, The static induction device (14) includes a static induction device portion (20) immersed in the liquid (16), and the static induction device assembly (10) further includes an enclosure member (22). The static induction device (14) is at least partially enclosed by the enclosure member (22), wherein at least one cooling conduit (24) is formed between the static induction device (14) and the enclosure member (22), and / or wherein the at least one cooling conduit (24) extends at least partially through the static induction device (14), the at least one cooling conduit (24) is at least partially defined by a portion (20) of the static induction device, and, viewed from the vertical direction (z), the at least one cooling conduit (24) includes a lower inlet (26) and An upper outlet (28), wherein each of the lower inlet (26) and the upper outlet (28) is in fluid communication with the liquid (16), and the at least one cooling conduit (24) is adapted to transport the liquid (16) from the lower inlet (26) to the upper outlet (28), wherein the method includes: determining a liquid pressure difference (Δp) between the liquid pressure at the upper outlet (28) and the liquid pressure at the lower inlet (26), wherein the method includes: performing at least the following for the static induction device portion (20): - Determine the heat loss value (Q), which indicates the heat loss of the static induction device portion (20), which has a vertical static induction device portion position (z) along the vertical direction (z). port ); - Determine the liquid temperature value (T) liq (z port The liquid temperature value indicates the partial position of the vertical static inductive device (z). port The temperature of the liquid (16) in the liquid, and - Using the liquid pressure difference (Δp), the heat loss value (Q), and the liquid temperature value (T) liq (z port To determine the temperature (T) of the static induction device section (20) port ).

2. The method according to claim 1, wherein, The static inductive device (14) is completely immersed in the liquid (16).

3. The method according to claim 1, wherein, The method includes: determining a temperature profile, the temperature profile indicating the interior of the housing (12) but outside the enclosure member (22), and at the vertical position of the upper outlet (z) located at the upper outlet (28). upper ) and the vertical position of the lower inlet (26) of the lower inlet (z) lower The temperature (T) of the liquid (16) at multiple different vertical positions between ) liq ).

4. The method according to claim 3, wherein, Determine the liquid temperature value (T) liq (z port The steps of the above include: using the temperature curve and the position of the vertical static induction device portion (20) along the vertical direction (z) of the vertical static induction device portion (z). port ).

5. The method according to claim 3 or claim 4, wherein, Determining the temperature profile involves using multiple temperature sensors (32, 34, 36, 38, 40) arranged inside the housing (12) but outside the enclosure member (22), and between the vertical position of the upper outlet (28) and the vertical position of the lower inlet (26).

6. The method according to claim 3 or claim 4, wherein, The temperature profile is determined by the following: - A measuring component is used to determine the measured temperature data, which includes the temperature at each of a plurality of different locations of the static induction device assembly (10) as a function of time within the reference time range when the static induction device assembly (10) is in a state where at least a portion of the static induction device (14) generates heat during at least a portion of the reference time range. - A temperature model is generated to generate estimated temperature data, which corresponds to the estimated temperature at each of the plurality of different locations of the static inductive device assembly (10) as a function of time. The temperature model includes a learning model representing the estimated temperature data and the measured temperature data. - The measured temperature data is used to train the learning model to obtain the temperature model, and - Use the temperature model to determine the temperature curve.

7. The method according to claim 6, wherein, The learning model includes neural networks.

8. The method according to claim 7, wherein, The learning model includes a multi-layer neural network.

9. The method according to claim 6, wherein, The measurement component includes an optical fiber sensor (42) located within the enclosure member (22).

10. The method according to claim 9, wherein, The static inductive device (14) includes a winding (44), and the fiber optic sensor (42) is located at least partially in the winding (44).

11. The method according to claim 3, wherein, The step of determining the liquid pressure difference (Δp) between the liquid pressure at the upper outlet (28) and the liquid pressure at the lower inlet (26) includes: using the temperature curve and the density of the liquid (16) as a function of temperature. (Related information.) 12. The method according to claim 1, wherein, The method includes determining the fluid velocity (Q) of the liquid (16) flowing in the pipe based on the liquid pressure difference (Δp) and a factor (k) indicating the flow resistance of the at least one cooling pipe (24). v ).

13. The method according to claim 1, wherein, The step of determining the heat loss value (Q) includes: determining the value of the power (P) that indicates the power fed to the static induction device section (20).

14. The method according to claim 12, wherein, Using the liquid pressure difference (Δp), the heat loss value (Q), and the liquid temperature value (T) liq (z port The step of determining the temperature of the static induction device portion (20) includes: determining the heat transfer coefficient (h) between the static induction device portion (20) and the liquid (16), the heat transfer coefficient (h) being a function of the fluid flow rate, wherein the temperature of the static induction device portion (20) is determined as the liquid temperature value (T). liq (z port The sum of the parameters and the ratio between the heat loss value (Q) and the heat transfer coefficient (h).

15. The method according to claim 1, wherein, The static induction device (14) includes a winding (44), wherein the static induction device portion (20) is a part of the winding (44).

16. The method according to claim 1, wherein, The static induction device portion (20) is associated with the area of ​​the static induction device (14), which has a relatively high temperature compared to its surrounding environment.

17. A computer program product comprising program code, which, when executed by a processor device, is used to perform the method according to any one of claims 1 to 16.

18. A control unit (50) arranged to perform the method according to any one of claims 1 to 16.

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