Method and apparatus for temperature early warning of primary equipment

Abstract

The application is suitable for the technical field of temperature monitoring, and provides a primary equipment temperature early warning method and device. The method comprises the following steps: acquiring the number of incoming cables, the number of outgoing cables, the full loop resistance, the incoming current, the outgoing current and the positional relationship of three-phase busbars of a switch cabinet in a primary equipment; determining the position coordinates of the three-phase busbars based on the positional relationship of the three-phase busbars; determining the eddy current loss of the primary equipment based on the position coordinates of the three-phase busbars and the currents of the three-phase busbars; determining the loss of the primary equipment based on the number of incoming cables, the number of outgoing cables, the full loop resistance, the incoming current, the outgoing current and the eddy current loss; and if the duration for which the loss of the primary equipment reaches a preset loss threshold value exceeds a preset duration, the temperature of the primary equipment is warned. The application can timely alarm the temperature of the primary equipment and reduce the damage of the temperature to the primary equipment.

Description

Technical Field

[0001] This application belongs to the field of temperature monitoring technology, and in particular relates to a method and device for early warning of temperature in primary equipment. Background Technology

[0002] In power systems, the temperature change of primary equipment is a very important indicator, as it relates to whether the primary equipment can operate safely and stably.

[0003] Currently, operators use infrared thermometers to detect and track defects, recording equipment load, ambient temperature, hot spot temperature, and normal point temperature of primary equipment, as well as calculating relative temperature differences for analysis. However, current infrared thermometry data analysis often relies on temperatures exceeding fixed thresholds, failing to meet the requirement of ensuring primary equipment operates entirely within these thresholds. This can significantly negatively impact primary equipment, leading to rapid wear and tear on its lifespan, frequent component replacements, and increased maintenance costs. Summary of the Invention

[0004] This application provides a method and apparatus for early warning of primary equipment temperature, so as to promptly alarm the temperature of primary equipment and reduce the damage of temperature to primary equipment.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a method for early warning of primary equipment temperature, including:

[0007] Obtain the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the positional relationship of the three phases of the busbar in the switchgear of the primary equipment.

[0008] Based on the positional relationship of the three phases of the busbar, determine the positional coordinates of the three phases of the busbar; based on the positional coordinates of the three phases of the busbar and the current of the three phases of the busbar, determine the eddy current loss of the primary equipment.

[0009] The losses of the primary equipment are determined based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the eddy current loss.

[0010] If the duration for which the wear and tear of a primary device reaches a preset wear and tear threshold exceeds a preset duration, an early warning will be issued for the temperature of the primary device.

[0011] In conjunction with the first aspect, in some possible implementations, the losses of the primary equipment are determined based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and eddy current losses, including:

[0012] The resistance heating effect of the primary equipment is calculated based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, and the outgoing current.

[0013] The sum of the resistive heating effect and eddy current loss of the primary equipment is calculated to obtain the loss of the primary equipment.

[0014] In conjunction with the first aspect, in some possible implementations, the formula for calculating the resistance heating effect of the primary equipment is as follows:

[0015]

[0016] Where P1 represents the resistance heating effect of the primary equipment, n1 represents the number of incoming cables, and I 进 R represents the input current, R represents the total circuit resistance, and I represents the input current. 出 n1 represents the outgoing current, and n2 represents the number of outgoing cables.

[0017] In conjunction with the first aspect, in some possible implementations, the position coordinates of the three phases of the busbar are determined based on their positional relationship, including:

[0018] Obtain the length and width of each phase of the busbar.

[0019] Based on the positional relationship of the three phases of the busbar and the length and width of each phase of the busbar, the position coordinates of the three phases of the busbar are determined.

[0020] In conjunction with the first aspect, in some possible implementations, the eddy current losses of the primary equipment are determined based on the position coordinates of the three phases of the busbar and the current of the three phases of the busbar, including:

[0021] Obtain the current of phase A, phase B, and phase C in the three phases of the busbar.

[0022] Based on the position coordinates of the three phases of the busbar and the current of phase A in the three phases of the busbar, the magnetic induction intensity generated by a single phase A at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase B in the three phases of the busbar, the magnetic induction intensity generated by a single phase B at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase C in the three phases of the busbar, the magnetic induction intensity generated by a single phase C at any point in space is obtained.

[0023] The magnetic flux density of the busbar at any point in space is obtained by calculating the vector sum of the magnetic flux density generated by a single A phase, a single B phase, and a single C phase.

[0024] Based on the magnetic induction intensity of the busbar at any point in space, the power consumption per unit mass on the thin metal shell of the primary equipment is obtained.

[0025] Based on the power consumption per unit mass on the thin metal shell, the eddy current loss of the primary device is obtained.

[0026] In conjunction with the first aspect, in some possible implementations, the formula for calculating the magnetic flux density generated by a single A-phase at any point in space is:

[0027]

[0028] Among them, B A Let u0 represent the magnetic flux density produced by a single A-phase at any point in space, and u0 represent the permeability in vacuum. A The value represents the current of phase A, a represents the busbar width of a single phase, and b1 represents the minimum distance from that point to the edge of the phase A busbar.

[0029] The formula for calculating the magnetic flux density generated by a single B phase at any point in space is:

[0030]

[0031] Among them, B B I represents the magnetic flux density produced by a single B phase at any point in space. B b1 represents the current in phase B, and b2 represents the minimum distance from that point to the edge of the phase B busbar.

[0032] The formula for calculating the magnetic flux density generated by a single C-phase at any point in space is:

[0033]

[0034] Among them, B C I represents the magnetic flux density produced by a single C phase at any point in space. C b3 represents the current in phase C, and b3 represents the minimum distance from that point to the edge of the phase C busbar.

[0035] In conjunction with the first aspect, in some possible implementations, the formula for calculating the power consumption per unit mass on the thin metal shell is:

[0036]

[0037] Where P represents the power consumption per unit mass on the thin metal shell, and B p denoted by , where d represents the peak value of the magnetic induction intensity of the busbar at any point in space, d represents the thickness of the metal shell, f represents the frequency of the alternating current, ρ represents the resistivity, D represents the density of the metal shell, and k represents the charge constant.

[0038] In conjunction with the first aspect, among some possible implementations, the eddy current losses of the primary device are obtained based on the power consumption per unit mass on the thin metal shell, including:

[0039] Obtain the total mass of the metal shell of the primary equipment;

[0040] The eddy current loss of the primary equipment is obtained by calculating the product of the total mass of the metal shell and the power consumption per unit mass on the metal shell.

[0041] In conjunction with the first aspect, in some possible implementations, the formula for calculating the eddy current loss of the primary equipment is as follows:

[0042] P W =P×m

[0043] Among them, P W The value represents the eddy current loss of the primary equipment, P represents the power consumption per unit mass on the metal shell, and m represents the total mass of the metal shell of the primary equipment.

[0044] Secondly, embodiments of this application provide a primary equipment temperature early warning device, comprising:

[0045] The acquisition module is used to acquire the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the positional relationship of the three phases of the busbar in the switch cabinet of the primary equipment.

[0046] The eddy current calculation module is used to determine the position coordinates of the three phases of the busbar based on their positional relationship; and to determine the eddy current losses of the primary equipment based on the position coordinates and currents of the three phases of the busbar.

[0047] The loss calculation module is used to determine the losses of primary equipment based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the eddy current loss.

[0048] The early warning module is used to issue an early warning about the temperature of the primary equipment if the wear and tear of the primary equipment reaches a preset wear threshold for a duration exceeding a preset time.

[0049] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0050] The beneficial effects of the embodiments in this application compared with the prior art are:

[0051] This application calculates the eddy current loss of primary equipment by using the positional relationship of the three phases of the busbar and the three-phase current. Then, based on the parameters of the switchgear in the primary equipment and the eddy current loss, it determines the loss of the primary equipment and provides an early warning of the temperature of the primary equipment based on the loss. This can provide an early warning before the primary equipment reaches its maximum operating temperature, ensuring that the primary equipment operates below the maximum operating temperature, reducing the damage of excessively high temperatures to the primary equipment, and reducing the cost of maintenance or replacement.

[0052] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic flowchart of a primary equipment temperature early warning method provided in an embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the busbar structure of a switchgear in a primary device according to an embodiment of this application;

[0056] Figure 3 This is a coordinate diagram of the three phases of the busbar provided in an embodiment of this application;

[0057] Figure 4 This is a schematic diagram of the structure of a primary equipment temperature early warning device provided in an embodiment of this application. Detailed Implementation

[0058] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0059] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0060] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0061] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0062] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0063] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0064] This application provides a method for early warning of primary equipment temperature. By determining the losses of the primary equipment through the parameters of the switch cabinet in the primary equipment, an early warning of the temperature of the primary equipment can be given. This method can provide an early warning before the primary equipment reaches its maximum operating temperature, ensuring that the primary equipment operates below the maximum operating temperature, reducing the damage to the primary equipment caused by excessively high temperatures, and reducing the cost of maintenance or replacement.

[0065] Figure 1 This is a schematic flowchart of a primary equipment temperature early warning method according to an embodiment of this application, referring to... Figure 1 The detailed description of the primary equipment temperature early warning method is as follows:

[0066] Step 101: Obtain the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the positional relationship of the three phases of the busbar in the switchgear of the primary equipment.

[0067] Step 102: Based on the positional relationship of the three phases of the busbar, determine the positional coordinates of the three phases of the busbar; based on the positional coordinates of the three phases of the busbar and the current of the three phases of the busbar, determine the eddy current loss of the primary equipment.

[0068] For example, determining the position coordinates of the three phases of the busbar based on their positional relationship can include:

[0069] Obtain the length and width of each phase of the busbar.

[0070] Based on the positional relationship of the three phases of the busbar and the length and width of each phase of the busbar, the position coordinates of the three phases of the busbar are determined.

[0071] Specifically, such as Figure 2 As shown, the central part of the switch cabinet is a three-phase busbar. The upper and lower parts of the three-phase busbar are connected to the incoming and outgoing cables, respectively. Phases A, B, and C are thin metal sheets. Based on this, we can understand the relative positional relationship between phases A, B, and C and their spatial arrangement.

[0072] Specifically, ignoring the thickness of the three phases of the busbar, such as Figure 3 As shown, by placing phases A, B, and C in the spatial coordinate system O-XYZ, the position coordinates between the three phases of the busbar can be determined. N is any point in space with coordinates (x, y, z). The interval between phases A, B, and C is n. The length of phases A, B, and C is h, and the width of phases A, B, and C is a.

[0073] For example, determining the eddy current losses of primary equipment based on the position coordinates of the three phases of the busbar and the current of the three phases of the busbar can include:

[0074] Obtain the current of phase A, phase B, and phase C in the three phases of the busbar.

[0075] Based on the position coordinates of the three phases of the busbar and the current of phase A in the three phases of the busbar, the magnetic induction intensity generated by a single phase A at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase B in the three phases of the busbar, the magnetic induction intensity generated by a single phase B at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase C in the three phases of the busbar, the magnetic induction intensity generated by a single phase C at any point in space is obtained.

[0076] The magnetic flux density of the busbar at any point in space is obtained by calculating the vector sum of the magnetic flux density generated by a single A phase, a single B phase, and a single C phase.

[0077] Based on the magnetic induction intensity of the busbar at any point in space, the power consumption per unit mass on the thin metal shell of the primary equipment is obtained.

[0078] Based on the power consumption per unit mass on the thin metal shell, the eddy current loss of the primary device is obtained.

[0079] Specifically, the eddy current loss on the thin metal shell of a primary device is mainly related to the received magnetic induction intensity. Therefore, the eddy current loss problem can be transformed into a problem of calculating magnetic induction intensity, simplifying the complex problem and improving the accuracy of eddy current loss calculation.

[0080] Specifically, when calculating the vector sum of the magnetic induction intensity generated by a single A phase, a single B phase, and a single C phase at any point in space, it is necessary to combine the position coordinates of the three phases of the busbar for calculation. The result of this vector sum is related to the relative positional relationship between the three phases of the busbar.

[0081] For example, the formula for calculating the magnetic flux density generated by a single phase A at any point in space can be:

[0082]

[0083] Among them, B A Let u0 represent the magnetic flux density produced by a single A-phase at any point in space, and u0 represent the permeability in vacuum. A The value represents the current of phase A, a represents the busbar width of a single phase, and b1 represents the minimum distance from that point to the edge of the phase A busbar.

[0084] The formula for calculating the magnetic flux density generated by a single B phase at any point in space can be:

[0085]

[0086] Among them, B B I represents the magnetic flux density produced by a single B phase at any point in space. B b1 represents the current in phase B, and b2 represents the minimum distance from that point to the edge of the phase B busbar.

[0087] The formula for calculating the magnetic flux density generated by a single C-phase at any point in space can be:

[0088]

[0089] Among them, B C I represents the magnetic flux density produced by a single C phase at any point in space. C b3 represents the current in phase C, and b3 represents the minimum distance from that point to the edge of the phase C busbar.

[0090] Specifically, ignoring the influence of busbar thickness, assuming a symmetrical and uniform current distribution in each busbar, the spatial magnetic field transformation is only affected by the three-phase current, while ignoring other interference sources and partial shielding from other cabinets. This further clarifies the calculation method for the magnetic induction intensity of a single A-phase, a single B-phase, and a single C-phase at any point in space. The calculation is simple, improving the calculation efficiency of primary equipment losses and thus ensuring the timeliness of subsequent early warnings.

[0091] For example, the formula for calculating the power consumption per unit mass on a thin metal shell can be:

[0092]

[0093] Where P represents the power consumption per unit mass on the thin metal shell, and B p denoted by , where d represents the peak value of the magnetic induction intensity of the busbar at any point in space, d represents the thickness of the metal shell, f represents the frequency of the alternating current, ρ represents the resistivity, D represents the density of the metal shell, and k represents the charge constant.

[0094] Specifically, in the primary equipment, the magnetic induction intensity formed by the busbar is not completely uniform in distribution from the overall perspective of the primary equipment. However, the power consumption per unit mass on the thin metal shell is still proportional to the square of the current. In order to balance the different magnetic induction intensities at different locations, the peak value of the magnetic induction intensity of the busbar at any point in the space is used to calculate the power consumption per unit mass on the thin metal shell, which facilitates the subsequent calculation of the eddy current loss of the primary equipment.

[0095] For example, obtaining the eddy current loss of a primary device based on the power consumption per unit mass on a thin metal shell can include:

[0096] Obtain the total mass of the metal shell of the primary equipment;

[0097] The eddy current loss of the primary equipment is obtained by calculating the product of the total mass of the metal shell and the power consumption per unit mass on the metal shell.

[0098] For example, the formula for calculating the eddy current loss of a primary device can be:

[0099] P W =P×m

[0100] Among them, P W The value represents the eddy current loss of the primary equipment, P represents the power consumption per unit mass on the metal shell, and m represents the total mass of the metal shell of the primary equipment.

[0101] Step 103: Determine the losses of the primary equipment based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the eddy current loss.

[0102] Specifically, there are many methods for measuring the total circuit resistance of a switchgear, such as:

[0103] Step S1: Place all the circuit breakers under test and the disconnectors (handcarts) on both sides of a busbar in the closed position.

[0104] Step S2: Select the test reference point, clamp test clamp 1 on phase A, and clamp another test clamp 2 on phase A at the cable head of the outgoing switch of the interval to be tested. After the test, record the DC resistance data, and then proceed to test the next phase A of the interval in sequence.

[0105] Step S3: After all tests are completed, shift the reference point to phase B. After testing all phase B in sequence, test the circuit resistance of all phase C intervals in the same test sequence as above.

[0106] For example, step 103 may include:

[0107] The resistance heating effect of the primary equipment is calculated based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, and the outgoing current.

[0108] The losses of the primary equipment are obtained by calculating the sum of the resistive heating effect and eddy current loss of the primary equipment.

[0109] Specifically, the heat generated inside the switchgear cabinet mainly comes from the thermal effect of current flowing through the resistor and the eddy current loss caused by the alternating magnetic field in the surrounding magnetically conductive metal material. Therefore, the losses of the primary equipment can be obtained by calculating the sum of the resistive heating effect and the eddy current loss of the primary equipment.

[0110] For example, the formula for calculating the resistance heating effect of a primary device can be:

[0111]

[0112] Where P1 represents the resistance heating effect of the primary equipment, n1 represents the number of incoming cables, and I 进 R represents the input current, R represents the total circuit resistance, and I represents the input current. 出 n represents the outgoing current, and n2 represents the number of outgoing cables.

[0113] Step 104: If the duration for which the primary equipment's loss reaches the preset loss threshold exceeds the preset duration, then an early warning is issued for the temperature of the primary equipment.

[0114] The aforementioned primary equipment temperature early warning method calculates the eddy current losses of the primary equipment based on the positional relationship of the three phases of the busbar and the three-phase current. Then, based on the parameters and eddy current losses of the switchgear in the primary equipment, it determines the losses of the primary equipment and provides an early warning of the temperature of the primary equipment based on the losses. This method can provide an early warning before the primary equipment reaches its maximum operating temperature, ensuring that the primary equipment operates below the maximum operating temperature, reducing the damage caused by excessively high temperatures, and reducing the cost of maintenance or replacement.

[0115] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0116] Corresponding to the primary equipment temperature early warning method described in the above embodiments, Figure 2 The diagram shows a structural block diagram of a primary equipment temperature early warning device provided in an embodiment of this application. For ease of explanation, only the parts related to the embodiment of this application are shown.

[0117] See Figure 2 The primary equipment temperature early warning device in this application embodiment may include:

[0118] The acquisition module 201 is used to acquire the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the positional relationship of the three phases of the busbar in the switch cabinet of the primary equipment.

[0119] Eddy current calculation module 202 is used to determine the position coordinates of the three phases of the busbar based on the positional relationship of the three phases of the busbar; and to determine the eddy current loss of the primary equipment based on the position coordinates of the three phases of the busbar and the current of the three phases of the busbar.

[0120] The loss calculation module 203 is used to determine the loss of primary equipment based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the eddy current loss.

[0121] The early warning module 204 is used to issue an early warning about the temperature of the primary equipment if the duration of the primary equipment's loss reaching the preset loss threshold exceeds the preset duration.

[0122] For example, the loss calculation module 203 can be used to:

[0123] The resistance heating effect of the primary equipment is calculated based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, and the outgoing current.

[0124] The losses of the primary equipment are obtained by calculating the sum of the resistive heating effect and eddy current loss of the primary equipment.

[0125] For example, the formula for calculating the resistance heating effect of a primary device can be:

[0126]

[0127] Where P1 represents the resistance heating effect of the primary equipment, n1 represents the number of incoming cables, and I 进 R represents the input current, R represents the total circuit resistance, and I represents the input current. 出 n represents the outgoing current, and n2 represents the number of outgoing cables.

[0128] For example, the eddy current calculation module 202 can be used for:

[0129] Obtain the length and width of each phase of the busbar.

[0130] Based on the positional relationship of the three phases of the busbar and the length and width of each phase of the busbar, the position coordinates of the three phases of the busbar are determined.

[0131] For example, the eddy current calculation module 202 can also be used for:

[0132] Obtain the current of phase A, phase B, and phase C in the three phases of the busbar.

[0133] Based on the position coordinates of the three phases of the busbar and the current of phase A in the three phases of the busbar, the magnetic induction intensity generated by a single phase A at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase B in the three phases of the busbar, the magnetic induction intensity generated by a single phase B at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase C in the three phases of the busbar, the magnetic induction intensity generated by a single phase C at any point in space is obtained.

[0134] The magnetic flux density of the busbar at any point in space is obtained by calculating the vector sum of the magnetic flux density generated by a single A phase, a single B phase, and a single C phase.

[0135] Based on the magnetic induction intensity of the busbar at any point in space, the power consumption per unit mass on the thin metal shell of the primary equipment is obtained.

[0136] Based on the power consumption per unit mass on the thin metal shell, the eddy current loss of the primary device is obtained.

[0137] For example, the formula for calculating the magnetic flux density generated by a single phase A at any point in space can be:

[0138]

[0139] Among them, B A Let u0 represent the magnetic flux density produced by a single A-phase at any point in space, and u0 represent the permeability in vacuum.A The value represents the current of phase A, a represents the busbar width of a single phase, and b1 represents the minimum distance from that point to the edge of the phase A busbar.

[0140] The formula for calculating the magnetic flux density generated by a single B phase at any point in space can be:

[0141]

[0142] Among them, B B I represents the magnetic flux density produced by a single B phase at any point in space. B b1 represents the current in phase B, and b2 represents the minimum distance from that point to the edge of the phase B busbar.

[0143] The formula for calculating the magnetic flux density generated by a single C-phase at any point in space can be:

[0144]

[0145] Among them, B C I represents the magnetic flux density produced by a single C phase at any point in space. C b3 represents the current in phase C, and b3 represents the minimum distance from that point to the edge of the phase C busbar.

[0146] For example, the formula for calculating the power consumption per unit mass on a thin metal shell can be:

[0147]

[0148] Where P represents the power consumption per unit mass on the thin metal shell, and B p denoted by , where d represents the peak value of the magnetic induction intensity of the busbar at any point in space, d represents the thickness of the metal shell, f represents the frequency of the alternating current, ρ represents the resistivity, D represents the density of the metal shell, and k represents the charge constant.

[0149] For example, the eddy current calculation module 202 can also be used for:

[0150] Obtain the total mass of the metal shell of the primary equipment;

[0151] The eddy current loss of the primary equipment is obtained by calculating the product of the total mass of the metal shell and the power consumption per unit mass on the metal shell.

[0152] For example, the formula for calculating the eddy current loss of a primary device can be:

[0153] P W =P×m

[0154] Among them, P WThe value represents the eddy current loss of the primary equipment, P represents the power consumption per unit mass on the metal shell, and m represents the total mass of the metal shell of the primary equipment.

[0155] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0156] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0157] Those skilled in the art will recognize that the templates, units, and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0158] If the module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above embodiments of the primary device temperature warning method. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0159] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for early warning of primary equipment temperature, characterized in that, include: Obtain the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the positional relationship of the three phases of the busbar in the switchgear of the primary equipment; Based on the positional relationship of the three phases of the busbar, determine the position coordinates of the three phases of the busbar; Based on the position coordinates of the three phases of the busbar and the current of the three phases of the busbar, the eddy current loss of the primary equipment is determined, including: Obtain the current in phase A, phase B, and phase C of the three phases of the busbar; Based on the position coordinates of the three phases of the busbar and the current of phase A in the three phases of the busbar, the magnetic induction intensity generated by a single phase A at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase B in the three phases of the busbar, the magnetic induction intensity generated by a single phase B at any point in space is obtained; based on the position coordinates of the three phases of the busbar and the current of phase C in the three phases of the busbar, the magnetic induction intensity generated by a single phase C at any point in space is obtained. The magnetic flux density of the busbar at any point in the space is obtained by calculating the vector sum of the magnetic flux density generated by a single A phase, the magnetic flux density generated by a single B phase, and the magnetic flux density generated by a single C phase at any point in the space. Based on the magnetic induction intensity of the busbar at any point in the space, the power consumption per unit mass on the metal shell of the primary device is obtained. The eddy current loss of the primary device is obtained based on the power consumption per unit mass on the thin metal shell. Based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the eddy current loss, the losses of the primary equipment are determined, including: The resistance heating effect of the primary equipment is calculated based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, and the outgoing current. The sum of the resistive heating effect and the eddy current loss of the primary equipment is calculated to obtain the loss of the primary equipment; If the duration for which the loss of the primary equipment reaches the preset loss threshold exceeds the preset duration, an early warning will be issued for the temperature of the primary equipment. The formula for calculating the power consumption per unit mass on the thin metal shell is as follows: in, This represents the power consumption per unit mass on the thin metal shell. This represents the peak value of the magnetic flux density of the busbar at any point in the space. Indicates the thickness of a thin metal shell. Indicates the frequency of alternating current. Represents resistivity. The density of a thin metal shell is indicated. This represents a constant electric charge.

2. The primary equipment temperature early warning method as described in claim 1, characterized in that, The formula for calculating the resistance heating effect of the primary equipment is as follows: in, This indicates the resistance heating effect of the primary equipment. This indicates the number of incoming cables. Indicates the incoming line current. This represents the total circuit resistance. This indicates the outgoing line current. This indicates the number of outgoing cables.

3. The primary equipment temperature early warning method as described in claim 1, characterized in that, Determining the position coordinates of the three phases of the busbar based on their positional relationship includes: Obtain the length and width of each phase of the busbar; Based on the positional relationship of the three phases of the busbar and the length and width of each phase of the busbar, the position coordinates of the three phases of the busbar are determined.

4. The primary equipment temperature early warning method as described in claim 1, characterized in that, The formula for calculating the magnetic induction intensity generated by a single phase A at any point in the space is: in, This represents the magnetic flux density generated by a single phase A at any point in the space. Represents the magnetic permeability in a vacuum. This represents the current in phase A. Indicates the busbar width for a single phase. This represents the minimum distance from that point to the edge of the A-phase busbar; The formula for calculating the magnetic induction intensity generated by a single B phase at any point in the space is: in, This represents the magnetic flux density generated by a single B phase at any point in the space. This represents the current in phase B. This represents the minimum distance from that point to the edge of the B-phase busbar; The formula for calculating the magnetic induction intensity generated by a single C phase at any point in the space is: in, This represents the magnetic flux density generated by a single C-phase at any point in the space. This represents the current in phase C. This represents the minimum distance from that point to the edge of the C-phase busbar.

5. The primary equipment temperature early warning method as described in claim 1, characterized in that, The eddy current loss of the primary device is obtained based on the power consumption per unit mass on the thin metal shell, including: Obtain the total mass of the metal shell of the primary equipment; The eddy current loss of the primary device is obtained by calculating the product of the total mass of the metal shell of the primary device and the power consumption per unit mass on the metal shell.

6. The primary equipment temperature early warning method as described in claim 5, characterized in that, The formula for calculating the eddy current loss of the primary equipment is as follows: in, This represents the eddy current loss of the primary equipment. This represents the power consumption per unit mass of the thin metal shell. This indicates the total mass of the metal shell of the primary equipment.

7. A primary equipment temperature early warning device, characterized in that, For implementing the primary equipment temperature early warning method as described in any one of claims 1-6, the primary equipment temperature early warning device comprises: The acquisition module is used to acquire the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the positional relationship of the three phases of the busbar in the switch cabinet of the primary equipment. The eddy current calculation module is used to determine the position coordinates of the three phases of the busbar based on their positional relationship; and to determine the eddy current loss of the primary equipment based on the position coordinates of the three phases of the busbar and the current of the three phases of the busbar. The loss calculation module is used to determine the loss of the primary equipment based on the number of incoming cables, the number of outgoing cables, the total circuit resistance, the incoming current, the outgoing current, and the eddy current loss. The early warning module is used to issue an early warning about the temperature of the primary equipment if the duration for which the loss of the primary equipment reaches a preset loss threshold exceeds a preset duration.

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