Model selection method of large generator iron core magnetization test equipment

Abstract

The invention relates to a model selection method and device of large-scale generator iron core magnetization test equipment, computer equipment, a computer readable storage medium and a computer program product, and can be used in the technical field of electric power. The method comprises the following steps: determining excitation parameters of the generator according to a preset number of turns of an excitation coil of the generator and iron core parameters of the generator; determining a maximum voltage value from the voltage values of the excitation coil, and determining a maximum current value from the current values of the excitation coil; determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value; according to the iron core parameters, iron core loss values are determined, and the maximum iron core loss value is determined from the iron core loss values; and determining equipment configuration information of the iron core magnetization test equipment of the generator according to the maximum iron core loss value, the maximum voltage value and the maximum current value. By adopting the method, the efficiency of determining the configuration information of the iron core magnetization test equipment of the generator can be improved.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a selection method, device, computer equipment, computer-readable storage medium and computer program product for large-scale generator core magnetization test equipment. Background Art

[0002] With the development of generator technology, the core performance test of the generator has become more and more important. Among them, the generator core magnetization test, as a key technology to test the core performance of the generator, is of great significance to ensure the safe operation of the generator. Therefore, how to efficiently determine the configuration information of the core magnetization test equipment of the generator has become an important research direction.

[0003] Traditional technology usually determines the configuration information of the core magnetization test equipment of the generator through manual experience estimation; however, determining the configuration information of the core magnetization test equipment of the generator through this method requires a lot of manual processing time, resulting in low efficiency in determining the configuration information of the core magnetization test equipment of the generator. Summary of the invention

[0004] Based on this, it is necessary to provide a selection method, device, computer equipment, computer-readable storage medium and computer program product for large-scale generator core magnetization test equipment, which can improve the efficiency of determining the configuration information of the generator core magnetization test equipment in response to the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a method for selecting a large generator core magnetization test device. The method comprises:

[0006] Determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil;

[0007] Determining a maximum voltage value from the voltage values ​​of the excitation coil, and determining a maximum current value from the current values ​​of the excitation coil;

[0008] Determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value;

[0009] Determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values;

[0010] The equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0011] In one embodiment, determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator includes:

[0012] Obtaining a cross-sectional area of ​​a stator core yoke of the generator and a magnetic flux density of a stator core yoke of the generator from the core parameters of the generator;

[0013] Determine the voltage value of the excitation coil according to the frequency information of the test power supply, the cross-sectional area of ​​the stator core yoke, the magnetic flux density of the stator core yoke, the preset number of turns and the preset coefficient;

[0014] From the core parameters of the generator, obtain the outer diameter of the stator core of the generator, the height of the stator core yoke of the generator, and the magnetic field strength of the silicon steel sheets of the generator at a preset magnetic flux density;

[0015] The current value of the excitation coil is determined according to the outer diameter of the stator core, the height of the stator core yoke, the magnetic field strength and the preset number of turns.

[0016] In one embodiment, determining the cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value includes:

[0017] Determining cable cross-section information of the excitation coil according to the maximum current value;

[0018] Determining cable insulation information of the excitation coil according to the maximum voltage value;

[0019] Determining a reference length of the excitation coil according to the preset number of turns, the length of the stator core of the generator, the outer diameter of the stator core of the generator, and the inner diameter of the stator core of the generator;

[0020] Determining a target length of the excitation coil according to the reference length; the target length is a preset length multiple of the reference length;

[0021] The cable configuration information of the excitation coil is generated according to the cable cross-section information, the cable insulation information and the target length.

[0022] In one embodiment, determining the core loss value of the generator during the core magnetization test according to the core parameters of the generator includes:

[0023] Obtaining the silicon steel sheet density of the generator;

[0024] Determining quality information of the stator core yoke of the generator according to the outer diameter of the stator core of the generator, the height of the stator core yoke of the generator, the cross-sectional area of ​​the stator core yoke of the generator and the density of the silicon steel sheets;

[0025] In the case where the generator is a non-salient pole synchronous generator, the core loss value is determined according to the standard specific loss of the stator core silicon steel sheet material of the generator at a first preset magnetic flux density and the mass information of the stator core yoke;

[0026] In the case where the generator is a hydro-turbine generator, the core loss value is determined according to the standard specific loss of the stator core silicon steel sheet material of the generator at a second preset magnetic flux density and the mass information of the stator core yoke.

[0027] In one embodiment, the core magnetization test equipment includes an induction voltage regulator, a test transformer, a test power supply and a first compensation capacitor group; the first compensation capacitor group is arranged at both ends of the excitation coil;

[0028] The determining of the equipment configuration information of the core magnetization test equipment of the generator according to the maximum core loss value, the maximum voltage value and the maximum current value comprises:

[0029] Determining capacity configuration information of the induction voltage regulator, capacity configuration information of the test transformer, and capacity configuration information of the test power supply according to the maximum core loss value;

[0030] Determining the rated voltage of the test transformer according to the maximum voltage value;

[0031] The capacitance value of each capacitor in the first compensation capacitor group is determined according to the maximum voltage value, the maximum current value, the number of capacitors in the first compensation capacitor group, and the frequency information of the test power supply.

[0032] In one embodiment, the core magnetization test equipment further includes a second compensation capacitor group; the second compensation capacitor group is arranged on the incoming line side of the test power supply;

[0033] The method further comprises:

[0034] The capacitance value of each capacitor in the second compensation capacitor group is determined according to the maximum core loss value, the number of capacitors in the second compensation capacitor group, the frequency information of the test power supply and the rated voltage of the test power supply.

[0035] In a second aspect, the present application also provides a device for selecting a large generator core magnetization test device. The device comprises:

[0036] A first determination module, configured to determine the excitation parameters of the generator according to a preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include a voltage value of the excitation coil and a current value of the excitation coil;

[0037] A second determination module, used to determine a maximum voltage value from the voltage values ​​of the excitation coil, and to determine a maximum current value from the current values ​​of the excitation coil;

[0038] A third determining module, configured to determine the cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value;

[0039] A fourth determination module is used to determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values;

[0040] The fifth determination module is used to determine the equipment configuration information of the core magnetization test equipment of the generator according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0041] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0042] Determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil;

[0043] Determining a maximum voltage value from the voltage values ​​of the excitation coil, and determining a maximum current value from the current values ​​of the excitation coil;

[0044] Determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value;

[0045] Determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values;

[0046] The equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0047] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0048] Determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil;

[0049] Determining a maximum voltage value from the voltage values ​​of the excitation coil, and determining a maximum current value from the current values ​​of the excitation coil;

[0050] Determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value;

[0051] Determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values;

[0052] The equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0053] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0054] Determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil;

[0055] Determining a maximum voltage value from the voltage values ​​of the excitation coil, and determining a maximum current value from the current values ​​of the excitation coil;

[0056] Determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value;

[0057] Determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values;

[0058] The equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0059] The selection method, device, computer equipment, computer-readable storage medium and computer program product of the above-mentioned large-scale generator core magnetization test equipment determine the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil; the maximum voltage value is determined from the voltage value of the excitation coil, and the maximum current value is determined from the current value of the excitation coil; the cable configuration information of the excitation coil is determined according to the maximum voltage value and the maximum current value; the core loss value of the generator during the core magnetization test is determined according to the core parameters of the generator, and the maximum core loss value of the generator during the core magnetization test is determined from the core loss value; the equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value. This solution determines the excitation parameters by presetting the number of turns of the generator's excitation coil and combining it with the core parameters, and then determines the maximum voltage and maximum current values ​​through the excitation parameters, which is conducive to simplifying the calculation process and improving the accuracy of parameter determination; then the cable configuration information is determined based on the maximum voltage and maximum current values, and the maximum core loss value is determined according to the core parameters. Finally, these parameters are comprehensively considered to determine the equipment configuration information, which is conducive to forming an automated equipment selection process, thereby helping to improve the efficiency of determining the configuration information of the generator's core magnetization test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 A schematic flow chart of a method for selecting a large generator core magnetization test device in one embodiment;

[0062] Figure 2 A schematic flow chart of the steps of determining the excitation parameters of a generator in one embodiment;

[0063] Figure 3 is a schematic diagram of a generator stator core magnetization test in one embodiment;

[0064] Figure 4 A structural block diagram of a device for selecting a large generator core magnetization test device in one embodiment;

[0065] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0067] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0068] In an exemplary embodiment, Figure 1 As shown, a method for selecting a large generator core magnetization test device is provided. This embodiment uses the method applied to a terminal as an example for illustration; it is understandable that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. Among them, the terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, etc.; the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services. In this embodiment, the method includes the following steps:

[0069] Step S101, determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil.

[0070] Step S102, determining a maximum voltage value from the voltage values ​​of the excitation coil, and determining a maximum current value from the current values ​​of the excitation coil.

[0071] Step S103, determining the cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value.

[0072] Step S104, determining the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determining the maximum core loss value of the generator during the core magnetization test from the core loss values.

[0073] Step S105, determining the equipment configuration information of the core magnetization test equipment of the generator according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0074] The core magnetization test equipment may be a combination of equipment for performing a magnetization test on a generator stator core, for example, a combination of equipment including an induction voltage regulator, a test transformer, a compensation capacitor bank, and the like.

[0075] The excitation coil may be a conductive wire wound around the stator core of the generator for generating a magnetic field, for example, may be a 12-turn conductive wire uniformly wound around the stator core of the generator.

[0076] The preset number of turns may be a preset number of turns of the excitation coil, for example, 12 turns.

[0077] The core parameters may be various parameters describing the characteristics of the generator stator core, such as the stator core length, the stator core outer diameter, the stator core inner diameter, the stator slot depth, the stator ventilation duct width, the number of stator ventilation ducts, and the like.

[0078] The excitation parameters may be parameters describing the working characteristics of the excitation coil, for example, the voltage value and current value of the excitation coil.

[0079] The cable configuration information may be information describing the characteristics of the cable used for the excitation coil, such as the cross-sectional area, insulation level, length, and other information of the cable.

[0080] The core loss value may be the power loss generated by the generator stator core during the magnetization test, for example, it may be a loss value calculated based on the mass of the stator core yoke and the standard ratio loss of silicon steel sheet material.

[0081] The equipment configuration information may be information describing the characteristics of each component of the core magnetization test equipment, such as the capacity, voltage level, and other information of the induction voltage regulator, test transformer, high-voltage compensation capacitor group, low-voltage compensation capacitor group, and other equipment.

[0082] Optionally, when selecting a large generator core magnetization test device, first set the preset number of turns of the generator excitation coil to 12 turns, and the terminal obtains the generator core parameters, including the stator core length, the stator core outer diameter, the stator core inner diameter, the stator slot depth, the stator ventilation duct width and the number of stator ventilation ducts; then, calculate the voltage value of the excitation coil according to the formula U1=4.44fQBW1, where f is the test power supply frequency, Q is the cross-sectional area of ​​the stator core yoke, and B is the magnetic flux density of the stator core yoke during the test; at the same time, according to the formula I=π(D1-H ys )H / W1 calculates the current value of the excitation coil, where D1 is the outer diameter of the stator core, H ysis the stator core yoke height, H is the magnetic field strength of the silicon steel sheet under a specific magnetic flux density; then, according to the calculated maximum voltage and maximum current values, determine the cable configuration information of the excitation coil, including the cable cross-sectional area, insulation level and length; after that, calculate the core loss value according to the core parameters of the generator, and determine the maximum core loss value; finally, based on the maximum core loss value, maximum voltage value and maximum current value, determine the capacity and voltage level of equipment such as the induction voltage regulator, test transformer, high-voltage compensation capacitor group and low-voltage compensation capacitor group.

[0083] In the selection method of the above-mentioned large-scale generator core magnetization test equipment, the excitation parameters of the generator are determined according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil; the maximum voltage value is determined from the voltage value of the excitation coil, and the maximum current value is determined from the current value of the excitation coil; the cable configuration information of the excitation coil is determined according to the maximum voltage value and the maximum current value; the core loss value of the generator during the core magnetization test is determined according to the core parameters of the generator, and the maximum core loss value of the generator during the core magnetization test is determined from the core loss value; the equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value. This solution determines the excitation parameters by presetting the number of turns of the generator's excitation coil and combining it with the core parameters, and then determines the maximum voltage and maximum current values ​​through the excitation parameters, which is conducive to simplifying the calculation process and improving the accuracy of parameter determination; then the cable configuration information is determined based on the maximum voltage and maximum current values, and the maximum core loss value is determined according to the core parameters. Finally, these parameters are comprehensively considered to determine the equipment configuration information, which is conducive to forming an automated equipment selection process, thereby helping to improve the efficiency of determining the configuration information of the generator's core magnetization test equipment.

[0084] In an exemplary embodiment, referring to Figure 2 , according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator, the excitation parameters of the generator are determined, which specifically include the following contents:

[0085] Step S201, obtaining the cross-sectional area of ​​the stator core yoke of the generator and the magnetic flux density of the stator core yoke of the generator from the core parameters of the generator;

[0086] Step S202, determining the voltage value of the excitation coil according to the frequency information of the test power supply, the cross-sectional area of ​​the stator core yoke, the magnetic flux density of the stator core yoke, the preset number of turns and the preset coefficient;

[0087] Step S203, obtaining, from the generator core parameters, the outer diameter of the generator stator core, the height of the generator stator core yoke, and the magnetic field strength of the generator silicon steel sheet at a preset magnetic flux density;

[0088] Step S204, determining the current value of the excitation coil according to the outer diameter of the stator core, the height of the stator core yoke, the magnetic field strength and the preset number of turns.

[0089] The cross-sectional area of ​​the stator core yoke may be the cross-sectional area of ​​the stator core yoke, for example, the product of the net length of the stator core and the height of the stator core yoke.

[0090] The magnetic flux density of the stator core yoke may be the magnetic induction intensity of the stator core yoke, for example, 1.4 T for a hidden-pole synchronous generator or 1.0 T for a hydro-turbine generator.

[0091] The frequency information of the test power supply may be the AC frequency of the test power supply, for example, 50 Hz.

[0092] The preset coefficient may be a fixed coefficient used to calculate the voltage value of the excitation coil, for example, may be 4.44.

[0093] The stator core yoke height may be half of the difference between the stator core outer diameter and the stator core inner diameter minus the stator slot depth, for example, (stator core outer diameter-stator core inner diameter) / 2-stator slot depth.

[0094] Among them, the magnetic field strength of the silicon steel sheet at a preset magnetic flux density can be the magnetic field strength of the silicon steel sheet at a specific magnetic flux density, for example, it can be the magnetic field strength of the silicon steel sheet at 1.4T (hidden pole synchronous generator) or 1.0T (hydro turbine generator), and its specific value is given by the manufacturer.

[0095] Optionally, the terminal first obtains parameters such as stator core length, stator ventilation duct width, number of stator ventilation ducts, stator core outer diameter, stator core inner diameter and stator slot depth from the core parameters of the generator, and then calculates the stator core length according to the formula L u =k Fe (Lb v n v ) Calculate the net length of the stator core, where k Fe is the stator core stacking coefficient, L is the stator core length, b v is the width of the stator ventilation duct, n v is the number of stator ventilation channels; then according to the formula H ys = (D1-D2) / 2-H s Calculate the stator core yoke height, where D1 is the stator core outer diameter, D2 is the stator core inner diameter, and H s is the stator slot depth; then according to the formula Q=L u H ys Calculate the cross-sectional area of ​​the stator core yoke; finally, calculate the voltage value of the excitation coil according to the formula U1=4.44fQBW1, and calculate the voltage value of the excitation coil according to the formula I=π(D1-Hys ) H / W1 calculates the current value of the excitation coil.

[0096] The technical solution provided in this embodiment is conducive to accurately determining the voltage value of the excitation coil by obtaining parameters such as the cross-sectional area of ​​the stator core yoke and the magnetic flux density from the core parameters of the generator, and calculating in combination with the frequency information of the test power supply and the preset coefficient; at the same time, by obtaining parameters such as the stator core outer diameter, the stator core yoke height and the magnetic field strength of the silicon steel sheet at a preset magnetic flux density for calculation, it is conducive to accurately determining the current value of the excitation coil, thereby facilitating improving the accuracy of determining the excitation parameters of the generator.

[0097] In an exemplary embodiment, the cable configuration information of the excitation coil is determined according to the maximum voltage value and the maximum current value, specifically including the following contents: determining the cable cross-section information of the excitation coil according to the maximum current value; determining the cable insulation information of the excitation coil according to the maximum voltage value; determining the reference length of the excitation coil according to a preset number of turns, the stator core length of the generator, the stator core outer diameter of the generator and the stator core inner diameter of the generator; determining the target length of the excitation coil according to the reference length; the target length is a preset length multiple of the reference length; generating the cable configuration information of the excitation coil according to the cable cross-section information, the cable insulation information and the target length.

[0098] The cable cross-sectional information may be information describing the cross-sectional area of ​​the cable used for the excitation coil, for example, according to the formula S=0.4×I max The calculated cross-sectional area of ​​the copper cable, where I max is the maximum current value.

[0099] The cable insulation information may be information describing the insulation level of the cable used for the excitation coil, for example, an insulation level value greater than a maximum voltage value.

[0100] The reference length may be the theoretical calculated length of the excitation coil, for example, according to the formula L emax =2×W1(L+D1-D2) is the calculated length, where W1 is the preset number of turns, L is the length of the stator core of the generator, D1 is the outer diameter of the stator core of the generator, and D2 is the inner diameter of the stator core of the generator.

[0101] The target length may be the actual use length of the excitation coil, for example, 1.5 times the reference length.

[0102] The preset length multiple may be a fixed coefficient used to calculate the target length, for example, may be 1.5.

[0103] The cable configuration information may be comprehensive information describing various characteristics of the cable used for the excitation coil, for example, it may be a combination of information including the cable cross-sectional area, insulation level, total length, and number of segments (12 segments).

[0104] Optionally, the terminal first calculates the cable cross-sectional area of ​​the excitation coil according to the maximum current value, specifically using the formula S=0.4×I max Calculate, where I max is the maximum current value; then determine the cable insulation level of the excitation coil according to the maximum voltage value, so that the cable insulation level is greater than the maximum voltage value; then according to the formula L emax =2×W1(L+D1-D2) to calculate the reference length of the excitation coil, where W1 is the preset number of turns, L is the stator core length of the generator, D1 is the outer diameter of the stator core of the generator, and D2 is the inner diameter of the stator core of the generator; then the reference length of the excitation coil is multiplied by the preset length multiple 1.5 to obtain the target length of the excitation coil; finally, based on the calculated cable cross-sectional area, cable insulation level and target length, the cable configuration information of the excitation coil is generated, and the cable of the target length is divided into 12 sections to facilitate on-site winding.

[0105] The technical solution provided in this embodiment is conducive to ensuring the safety performance of the cable by respectively determining the cable cross-section information and the cable insulation information according to the maximum current value and the maximum voltage value; by determining the reference length according to the preset number of turns and the stator core parameters of the generator, and determining the target length by using the preset length multiple, it is conducive to ensuring the accuracy of the cable length and reserving sufficient construction margin; finally, by comprehensively considering this information, complete cable configuration information is generated, which is conducive to improving the accuracy and practicality of cable selection.

[0106] In an exemplary embodiment, the core loss value of the generator during the core magnetization test is determined according to the core parameters of the generator, specifically including the following contents: obtaining the silicon steel sheet density of the generator; determining the stator core yoke quality information of the generator according to the stator core outer diameter of the generator, the stator core yoke height of the generator, the cross-sectional area of ​​the stator core yoke of the generator and the silicon steel sheet density; when the generator is a hidden pole synchronous generator, the core loss value is determined according to the standard specific loss of the stator core silicon steel sheet material of the generator at a first preset magnetic flux density and the stator core yoke quality information; when the generator is a hydro-turbine generator, the core loss value is determined according to the standard specific loss of the stator core silicon steel sheet material of the generator at a second preset magnetic flux density and the stator core yoke quality information.

[0107] The silicon steel sheet density may be the unit volume mass of the silicon steel sheet of the generator stator core, for example, it may be the density value of the silicon steel sheet represented by ρ, with the unit being T (Tesla).

[0108] The quality information of the stator core yoke may be the quality data of the stator core yoke of the generator, for example, according to the formula m=π(D1-H ys )Qρ is the mass value calculated in kg (kilograms).

[0109] The first preset magnetic flux density may be a standard magnetic flux density during a magnetization test of a non-salient-pole synchronous generator core, for example, 1.5 T (Tesla).

[0110] The second preset magnetic flux density may be a standard magnetic flux density during a hydro-generator core magnetization test, for example, 1.0 T (Tesla).

[0111] The standard specific loss can be the unit mass loss of silicon steel sheet material under a specific magnetic flux density, for example, P s (1.5) represents the standard specific loss or P at 1.5T magnetic flux density s (1.0) represents the standard specific loss at a magnetic flux density of 1.0T, with the unit of W / kg (watt / kilogram).

[0112] Optionally, the terminal first obtains the silicon steel sheet density ρ of the generator from the core parameters of the generator; then according to the formula m=π(D1-H ys )Qρ calculates the mass information of the stator core yoke of the generator, where D1 is the outer diameter of the stator core of the generator, H ys is the stator core yoke height of the generator, Q is the cross-sectional area of ​​the stator core yoke of the generator; then determine the type of generator. If the generator is a hidden pole synchronous generator, then according to the formula P=1.3mP s (1.5) Calculate the core loss value, where P s (1.5) is the standard loss ratio of the silicon steel sheet material of the stator core of the generator under a magnetic flux density of 1.5T; if the generator is a hydro-turbine generator, then according to the formula P=1.3mP s (1.0) Calculate the core loss value, where P s (1.0) is the standard specific loss of the silicon steel sheet material of the stator core of the generator under a magnetic flux density of 1.0T.

[0113] The technical solution provided in this embodiment calculates the stator core yoke quality information by obtaining the density of silicon steel sheets and combining parameters such as the stator core outer diameter, stator core yoke height and stator core yoke cross-sectional area of ​​the generator, which is conducive to accurately obtaining the basic parameters of the generator; by distinguishing between two types of hidden pole synchronous generators and hydro-turbine generators, and using standard specific losses under different preset magnetic flux densities for calculation, it is conducive to targeted determination of the core loss values ​​of different types of generators, thereby facilitating the accuracy of the core loss value calculation.

[0114] In an exemplary embodiment, the equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value, specifically including the following contents: according to the maximum core loss value, the capacity configuration information of the induction voltage regulator, the capacity configuration information of the test transformer and the capacity configuration information of the test power supply are determined; according to the maximum voltage value, the rated voltage of the test transformer is determined; according to the maximum voltage value, the maximum current value, the number of capacitors in the first compensation capacitor group and the frequency information of the test power supply, the capacitance value of each capacitor in the first compensation capacitor group is determined.

[0115] The core magnetization test equipment includes an induction voltage regulator, a test transformer, a test power supply and a first compensation capacitor group; the first compensation capacitor group is arranged at both ends of the excitation coil.

[0116] The inductive voltage regulator may be a device for adjusting the test voltage, for example, Figure 3 The input voltage of T1 in the test matches the test power supply voltage.

[0117] The test transformer may be a device used to convert the regulated voltage into the voltage required for the test, for example Figure 3 In T2, its input voltage matches the output voltage of the inductive regulator.

[0118] The test power supply may be a device that provides the electrical energy required for the test, for example, Figure 3 AC~380V power supply.

[0119] The first compensation capacitor group may be a parallel capacitor group used to compensate for the inductive reactive power of the excitation coil, for example, Figure 3 C2 in the circuit is set at both ends of the excitation coil.

[0120] The capacity configuration information may be a power capacity parameter of the device, for example, according to the formula S=1.2P max The calculated capacity value, where P max is the maximum core loss value.

[0121] The rated voltage may be a nominal operating voltage of the device, for example, 1.1 times the maximum voltage value.

[0122] The number of capacitors may be the number of capacitors in the first compensation capacitor group, for example, may be a value between 15 and 25.

[0123] The frequency information may be the AC frequency of the test power source, for example, 50 Hz (Hertz).

[0124] The capacitance value may be the capacitance of each capacitor, for example, it may be calculated according to the formula C1=Imax / 2N1πfU 1max The calculated value, where I max is the maximum current value, N1 is the number of capacitors, f is the frequency information of the test power supply, U 1max is the maximum voltage value.

[0125] Optionally, the terminal first determines the maximum core loss value P max , using the formula S=1.2P max Calculate the capacity configuration information of the induction voltage regulator, test transformer and test power supply, where the input voltage of the induction voltage regulator matches the voltage of the test power supply, and the input voltage of the test transformer matches the output voltage of the induction voltage regulator; then according to the maximum voltage value U 1max , set the rated voltage of the test transformer to 1.1 times the maximum voltage value U 1max Then, a first compensation capacitor group is set at both ends of the excitation coil. The number of capacitors N1 of the first compensation capacitor group is set between 15 and 25. According to the formula C1=I max / 2N1πfU 1max Calculate the capacitance value of each capacitor in the first compensation capacitor group, where I max is the maximum current value, f is the frequency information of the test power supply, and the rated voltage of each capacitor is 1.1 times the maximum voltage value U 1max .

[0126] The technical solution provided in this embodiment is beneficial to reducing the capacity requirements and equipment specifications of the test equipment by arranging a first compensation capacitor group at both ends of the excitation coil to compensate for the inductive reactive power, and reasonably configuring the capacity of the inductive voltage regulator, the test transformer and the test power supply according to the maximum core loss value; by systematically determining the rated voltage of the test transformer and the capacitance value of the compensation capacitor group according to parameters such as the maximum voltage value and the maximum current value, it is beneficial to optimize the equipment configuration, thereby reducing the equipment procurement cost and volume and improving the test efficiency.

[0127] In an exemplary embodiment, the following contents are also included: determining the capacitance value of each capacitor in the second compensation capacitor group according to the maximum core loss value, the number of capacitors in the second compensation capacitor group, the frequency information of the test power supply and the rated voltage of the test power supply.

[0128] The core magnetization test equipment further comprises a second compensation capacitor group; the second compensation capacitor group is arranged on the incoming line side of the test power supply.

[0129] The second compensation capacitor group may be a parallel capacitor group for compensating the inductive reactive power of the inductive voltage regulator, for example, Figure 3 C1 in the figure is set at both ends of the test power supply incoming line.

[0130] The incoming line side of the test power supply can be the end where the test power supply is connected to the external power grid, for example Figure 3 The side where the AC~380V power supply is connected.

[0131] The rated voltage of the test power supply may be the nominal operating voltage of the test power supply, for example Figure 3 AC~380V (380 volts alternating current).

[0132] The number of capacitors may be the number of capacitors in the second compensation capacitor group, for example, may be a value between 15 and 25.

[0133] The capacitance value may be the capacitance of each capacitor, for example, it may be calculated according to the formula C2=P max / 2N2πfU s 2 The calculated value, where P max is the maximum core loss value, N2 is the number of capacitors, f is the frequency information of the test power supply, U s is the rated voltage of the test power supply.

[0134] Optionally, the terminal sets a second compensation capacitor group on the incoming line side of the test power supply, and the second compensation capacitor group is used to compensate for the inductive reactive power of the inductive voltage regulator; the terminal sets the number of capacitors in the second compensation capacitor group between 15 and 25, and the rated voltage of each capacitor in the second compensation capacitor group matches the rated voltage of the test power supply; then the terminal calculates the rated voltage of the test power supply according to the formula C2=P max / 2N2πfU s 2 Calculate the capacitance value of each capacitor in the second compensation capacitor group, where P max is the maximum core loss value, N2 is the number of capacitors in the second compensation capacitor group, f is the frequency information of the test power supply, U s is the rated voltage of the test power supply.

[0135] The technical solution provided in this embodiment is beneficial to compensate for the inductive reactive power of the inductive voltage regulator and reduce the capacity requirement of the test power supply, thereby reducing the procurement cost of the equipment, reducing the weight and size of the equipment, and improving the test efficiency, by setting a second compensation capacitor group on the incoming line side of the test power supply and reasonably determining the capacitance value of each capacitor according to parameters such as the maximum core loss value, the number of capacitors, the frequency information of the test power supply and the rated voltage.

[0136] The following is an application example to illustrate the selection method of the large generator core magnetization test equipment provided by this application. This application example uses the method applied to the terminal as an example.

[0137] This application example relates to the technical field of generator core magnetization testing.

[0138] The stator core is one of the main components of the generator. The core magnetization test is to apply a specified magnetic flux density to the assembled stator core for a specified duration, measure the core loss and the temperature of each tooth, and check whether the core has local heating, the core unit loss and the temperature rise of the hottest tooth, and the maximum temperature difference between the cold and hot teeth meet the specified values. The generator core magnetization test is of great significance for evaluating the magnetization characteristics of the core, which can ensure the stability and reliability of the generator performance. When conducting a generator core magnetization test, the number of turns of the excitation coil, the excitation coil current and the power supply capacity are usually calculated to select the core test equipment and verify whether the existing test equipment can complete the generator core test.

[0139] In the related art, there is no special method for selecting generator core test equipment. Specifically, the number of turns of the excitation coil, the current of the excitation coil and the power supply capacity are calculated, the specification and length of the excitation cable are selected according to the calculated number of turns and current of the excitation coil, the induction voltage regulator and test transformer are selected according to the calculated power supply capacity, and the AC power supply capacity is checked to see if it meets the requirements.

[0140] The related technology has the following problems:

[0141] 1. When selecting the core magnetization test equipment, the output voltage U1 of the test transformer during the test is usually determined based on experience or the rated voltage of the high-voltage side of the existing test transformer. The number of turns W1 of the excitation coil and the excitation coil current I are calculated by applying the formula to U1, and then the specifications and length of the excitation cable are selected. However, when selecting the test equipment in this way, since U1 is fixed, the number of turns of the excitation coil is different for different generators due to different core sizes. When the number of turns of the excitation coil is small, it will cause uneven magnetic field inside the core, affecting the test results; when the number of turns of the excitation coil is large, it will significantly increase the difficulty of winding.

[0142] 2. The power capacity required for the stator core magnetization test is S=1.1U1I (U1 is the excitation coil voltage, I is the excitation coil current). According to this capacity, the induction voltage regulator and test transformer are selected and the AC power capacity is verified. However, for large hydro-generators, the capacity calculated by this formula is too large because no compensation measures are considered, which significantly increases the equipment procurement cost and the difficulty of test implementation.

[0143] The technical solution of this application example has the following characteristics:

[0144] (1) This application example takes into account the convenience of winding and the uniformity of the core magnetic field. First, an appropriate number of turns of the excitation coil is determined. Based on this, the excitation coil voltage and current required for each test object are calculated. The maximum value of these excitation coil voltages and currents is taken to determine the rated voltage of the test transformer, the specifications and length of the excitation coil.

[0145] (2) This application example takes into account the large reactive power in the core magnetization test of a large generator, and uses a capacitor bank to compensate for the inductive reactive power. Therefore, when selecting the inductive voltage regulator, test transformer, and calibrating the AC power supply capacity, only the active power and a small part of the reactive power are considered, which significantly reduces the equipment procurement cost and the difficulty of test implementation.

[0146] The process of this application example is as follows:

[0147] (1) Determine the number of turns W1 of the generator core test excitation coil. Considering the convenience of winding on site and the uniformity of the core magnetic field, W1 is taken as 12 turns. During the test, the excitation coil can be evenly wound on the generator stator core, or it can be wound 3 turns in each direction in four mutually perpendicular directions of the core circumference to ensure that the core magnetic field is sufficiently uniform during the test.

[0148] (2) Determine the maximum value of the excitation coil voltage U for all test objects 1max According to the formula U1=4.44fQBW1, the set of excitation coil voltages of all test objects is calculated as {U 11 , U 12 ...U 1n}, where U 1n is the excitation coil voltage of the nth test object, and the maximum excitation coil voltage of all test objects is U 1max =max{U 11 , U 12 ...U 1n}.

[0149] In the above formula: Q = L u H ys (m 3 ), Q is the cross-sectional area of ​​the stator core yoke, L u =k Fe (Lb v n v )(m), where L u is the net length of the stator core, k Fe is the stator core stacking coefficient, L is the stator core length (m), b v is the width of the stator ventilation duct (m), n v is the number of stator ventilation channels; H ys = (D1-D2) / 2-H s (m), where Hys is the stator core yoke height, D1 is the stator core outer diameter (m), D2 is the stator core inner diameter (m), H s is the stator slot depth (m); f is the test power frequency (Hz); B is the magnetic flux density of the stator core yoke during the test (T).

[0150] (3) Determine the maximum value of the excitation coil current I of all test objects max According to the formula I = π (D1-H ys )H / W1, the set of excitation coil currents of all test objects is calculated as {I1, I2...I n}, where I n is the excitation coil current of the nth test object, and the maximum excitation coil current of all test objects is I max =max{I1, I2...I n}.

[0151] In the above formula: H is the magnetic field strength (A / m) of the silicon steel sheet at 1.4 (hidden-pole synchronous generator) or 1.0T (hydro-turbine generator), which is given by the manufacturer.

[0152] (4) Determine the maximum total length L of the excitation coils of all test objects emax According to the formula L emax =2×W1(L+D1-D2), the total length of the excitation coils of all test objects is calculated as {L e1 , L e2 ...L en}, where L en is the total length of the excitation coil of the nth test object, and the maximum total length of the excitation coil of all test objects is L emax =max{L e1 , L e2 ...L en}.

[0153] (5) Select the excitation coil cable. Its cross-section should be able to pass 1.2 times the maximum excitation coil current I for a long time under the laying environment. max The copper cable cross section can be S=0.4×I max The insulation level should be greater than the maximum value of the excitation coil voltage U 1max ; Its length is 1.5 times the maximum value of the total length of the excitation coil L emax To facilitate on-site winding, it can be divided into 12 sections of equal length.

[0154] (6) Determine the maximum active power loss P of the core magnetization test of all test objects max For non-salient pole synchronous generators and hydro-turbine generators, according to the formula P = 1.3mP s(1.5) and P = 1.3mP s (1.0) The core loss set of all test objects during the core magnetization test is calculated as {P1, P2...P n}, where P n is the core loss of the nth test object during the core magnetization test, and the maximum core loss of all test objects during the core magnetization test is P max =max{P1, P2...P n}.

[0155] In the above formula: m = π (D1-H ys )Qρ (kg), m is the mass of the stator core yoke, ρ is the density of the silicon steel sheet (T); P s (1.0) is the standard specific loss of the stator core silicon steel sheet material at 1.0T, in W / kg; P s (1.5) is the standard specific loss of stator core silicon steel sheet material at 1.5T, in W / kg.

[0156] (7) Select the induction voltage regulator, test transformer and test power supply. The capacity of the induction voltage regulator, test transformer and test power supply should be 1.2 times the maximum active power loss P max Calculation, that is, S=1.2P max , where the input voltage of the induction voltage regulator matches the test power supply voltage, the input voltage of the test transformer matches the output voltage of the induction voltage regulator, and the rated voltage of the test transformer is 1.1 times the maximum value of the excitation coil voltage U 1max .

[0157] (8) Select the high-voltage compensation reactor group. A high-voltage parallel capacitor group is set at both ends of the excitation coil to compensate for the inductive reactive power of the excitation coil. The number of capacitors N1 in the high-voltage parallel capacitor group is generally between 15 and 25, and the rated voltage of the capacitor is 1.1 times the maximum excitation coil voltage U 1max , the capacitance of each capacitor is C1=I max / 2N1πfU 1max .

[0158] (9) Select the low-voltage compensation reactor group. A group of low-voltage parallel capacitors is set at both ends of the test power supply line to compensate for the inductive reactive power of the inductive voltage regulator. The number of capacitors N2 in the low-voltage parallel capacitor group is generally between 15 and 25. The rated voltage of the capacitor matches the rated voltage of the test power supply. The capacitance value of each capacitor is C2=P max / 2N2πfU s 2 .

[0159] In the above formula: U s is the rated voltage of the test power supply.

[0160] Among them, the principle of generator stator core magnetization test is referenced Figure 3 , Figure 3 The complete test system is shown. The system includes AC~380V power supply, switch cabinet K, inductive voltage regulator T1, oil-immersed transformer T2, low-voltage compensation capacitor group C1, high-voltage compensation capacitor group C2, excitation winding W1, measuring winding W2, CT, PT, V and loss tester. Among them, the low-voltage compensation capacitor group C1 is set on the test power supply incoming line side, and the high-voltage compensation capacitor group C2 is set at both ends of the excitation winding to compensate for inductive reactive power. Among them, AC means alternating current, CT means current transformer, PT means voltage transformer, V means voltmeter, and G means grounding point.

[0161] Among them, when the test power supply capacity is sufficient, the low-voltage compensating reactor group in step 9 may not be used.

[0162] Among them, the generator stator core is an important component that constitutes the generator magnetic flux circuit and fixes the stator coil. It is formed into a whole by pressing the punching sheets and various fasteners.

[0163] Among them, the core magnetization test: apply the specified magnetic flux density to the assembled stator core for the specified duration, measure the core loss and the temperature of each tooth, check whether the core has local heating, the core unit loss and the temperature rise of the hottest tooth, and whether the maximum temperature difference between the cold and hot teeth meets the specified values.

[0164] The technical solution provided in this application example selects the test equipment. Since the number of turns W1 of the excitation coil is fixed and will not change with the change of the size of the generator core, it can ensure that the internal magnetic field is uniform during the core magnetization test and avoid adverse effects on the test results. In addition, the number of turns of the excitation coil is appropriate, which greatly reduces the difficulty of on-site winding. A group of parallel capacitors are respectively set at both ends of the excitation coil and at both ends of the test power supply incoming line to compensate for the inductive reactive power of the inductive voltage regulator and the excitation coil, which greatly reduces the capacity of the test power supply, inductive voltage regulator, and test transformer required for the core magnetization test, reduces the equipment procurement cost, and also reduces the weight and size of the equipment, making it easier to carry out tests on site. The efficiency of determining the configuration information of the generator core magnetization test equipment is improved.

[0165] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0166] Based on the same inventive concept, the embodiment of the present application also provides a large generator core magnetization test equipment selection device for realizing the large generator core magnetization test equipment selection method involved in the above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the one or more large generator core magnetization test equipment selection device embodiments provided below can refer to the limitations of the large generator core magnetization test equipment selection method above, and will not be repeated here.

[0167] In an exemplary embodiment, Figure 4 As shown, a device for selecting a large generator core magnetization test equipment is provided. The device 400 for selecting a large generator core magnetization test equipment may include:

[0168] The first determination module 401 is used to determine the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil;

[0169] A second determination module 402, configured to determine a maximum voltage value from the voltage values ​​of the excitation coil, and to determine a maximum current value from the current values ​​of the excitation coil;

[0170] A third determination module 403 is used to determine the cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value;

[0171] The fourth determination module 404 is used to determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values;

[0172] The fifth determination module 405 is used to determine the equipment configuration information of the core magnetization test equipment of the generator according to the maximum core loss value, the maximum voltage value and the maximum current value.

[0173] In an exemplary embodiment, the first determination module 401 is also used to obtain the cross-sectional area of ​​the stator core yoke of the generator and the magnetic flux density of the stator core yoke of the generator from the core parameters of the generator; determine the voltage value of the excitation coil according to the frequency information of the test power supply, the cross-sectional area of ​​the stator core yoke, the magnetic flux density of the stator core yoke, the preset number of turns and the preset coefficient; obtain the stator core outer diameter of the generator, the stator core yoke height of the generator and the magnetic field strength of the silicon steel sheet of the generator at a preset magnetic flux density from the core parameters of the generator; determine the current value of the excitation coil according to the stator core outer diameter, the stator core yoke height, the magnetic field strength and the preset number of turns.

[0174] In an exemplary embodiment, the third determination module 403 is also used to determine the cable cross-section information of the excitation coil according to the maximum current value; determine the cable insulation information of the excitation coil according to the maximum voltage value; determine the reference length of the excitation coil according to a preset number of turns, the stator core length of the generator, the stator core outer diameter of the generator and the stator core inner diameter of the generator; determine the target length of the excitation coil according to the reference length; the target length is a preset length multiple of the reference length; generate the cable configuration information of the excitation coil according to the cable cross-section information, the cable insulation information and the target length.

[0175] In an exemplary embodiment, the fourth determination module 404 is also used to obtain the silicon steel sheet density of the generator; determine the stator core yoke quality information of the generator according to the stator core outer diameter of the generator, the stator core yoke height of the generator, the stator core yoke cross-sectional area of ​​the generator and the silicon steel sheet density; when the generator is a hidden pole synchronous generator, determine the core loss value according to the standard specific loss of the stator core silicon steel sheet material of the generator at a first preset magnetic flux density and the stator core yoke quality information; when the generator is a hydro-turbine generator, determine the core loss value according to the standard specific loss of the stator core silicon steel sheet material of the generator at a second preset magnetic flux density and the stator core yoke quality information.

[0176] In an exemplary embodiment, the core magnetization test equipment includes an induction voltage regulator, a test transformer, a test power supply and a first compensation capacitor group; the first compensation capacitor group is arranged at both ends of the excitation coil; the fifth determination module 405 is also used to determine the capacity configuration information of the induction voltage regulator, the capacity configuration information of the test transformer and the capacity configuration information of the test power supply according to the maximum core loss value; determine the rated voltage of the test transformer according to the maximum voltage value; determine the capacitance value of each capacitor in the first compensation capacitor group according to the maximum voltage value, the maximum current value, the number of capacitors in the first compensation capacitor group and the frequency information of the test power supply.

[0177] In an exemplary embodiment, the core magnetization test equipment also includes a second compensation capacitor group; the second compensation capacitor group is arranged on the incoming line side of the test power supply; the device 400 also includes: a sixth determination module, which is used to determine the capacitance value of each capacitor in the second compensation capacitor group based on the maximum core loss value, the number of capacitors in the second compensation capacitor group, the frequency information of the test power supply and the rated voltage of the test power supply.

[0178] Each module in the selection device of the large generator core magnetization test equipment can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0179] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 5 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for selecting a large generator core magnetization test equipment is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0180] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0181] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0182] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0183] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0184] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0185] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0186] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for selecting a large generator core magnetization test equipment, characterized in that: The method comprises: Determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include the voltage value of the excitation coil and the current value of the excitation coil; Determining a maximum voltage value from the voltage values ​​of the excitation coil, and determining a maximum current value from the current values ​​of the excitation coil; Determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value; Determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values; The equipment configuration information of the core magnetization test equipment of the generator is determined according to the maximum core loss value, the maximum voltage value and the maximum current value.

2. The method according to claim 1, characterized in that Determining the excitation parameters of the generator according to the preset number of turns of the excitation coil of the generator and the core parameters of the generator includes: Obtaining a cross-sectional area of ​​a stator core yoke of the generator and a magnetic flux density of a stator core yoke of the generator from the core parameters of the generator; Determine the voltage value of the excitation coil according to the frequency information of the test power supply, the cross-sectional area of ​​the stator core yoke, the magnetic flux density of the stator core yoke, the preset number of turns and the preset coefficient; From the core parameters of the generator, obtain the outer diameter of the stator core of the generator, the height of the stator core yoke of the generator, and the magnetic field strength of the silicon steel sheets of the generator at a preset magnetic flux density; The current value of the excitation coil is determined according to the outer diameter of the stator core, the height of the stator core yoke, the magnetic field strength and the preset number of turns.

3. The method according to claim 1, characterized in that The step of determining the cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value includes: Determining cable cross-section information of the excitation coil according to the maximum current value; Determining cable insulation information of the excitation coil according to the maximum voltage value; Determining a reference length of the excitation coil according to the preset number of turns, the length of the stator core of the generator, the outer diameter of the stator core of the generator, and the inner diameter of the stator core of the generator; Determining a target length of the excitation coil according to the reference length; the target length is a preset length multiple of the reference length; The cable configuration information of the excitation coil is generated according to the cable cross-section information, the cable insulation information and the target length.

4. The method according to claim 1, characterized in that: Determining the core loss value of the generator during the core magnetization test according to the core parameters of the generator includes: Obtaining the silicon steel sheet density of the generator; Determining quality information of the stator core yoke of the generator according to the outer diameter of the stator core of the generator, the height of the stator core yoke of the generator, the cross-sectional area of ​​the stator core yoke of the generator and the density of the silicon steel sheets; In the case where the generator is a non-salient pole synchronous generator, the core loss value is determined according to the standard specific loss of the stator core silicon steel sheet material of the generator at a first preset magnetic flux density and the mass information of the stator core yoke; In the case where the generator is a hydro-turbine generator, the core loss value is determined according to the standard specific loss of the stator core silicon steel sheet material of the generator at a second preset magnetic flux density and the mass information of the stator core yoke.

5. The method according to claim 1, characterized in that The core magnetization test equipment includes an induction voltage regulator, a test transformer, a test power supply and a first compensation capacitor group; the first compensation capacitor group is arranged at both ends of the excitation coil; The determining of the equipment configuration information of the core magnetization test equipment of the generator according to the maximum core loss value, the maximum voltage value and the maximum current value comprises: Determining capacity configuration information of the induction voltage regulator, capacity configuration information of the test transformer, and capacity configuration information of the test power supply according to the maximum core loss value; Determining the rated voltage of the test transformer according to the maximum voltage value; The capacitance value of each capacitor in the first compensation capacitor group is determined according to the maximum voltage value, the maximum current value, the number of capacitors in the first compensation capacitor group, and the frequency information of the test power supply.

6. The method according to claim 5, characterized in that The core magnetization test equipment further includes a second compensation capacitor group; the second compensation capacitor group is arranged on the incoming line side of the test power supply; The method further comprises: The capacitance value of each capacitor in the second compensation capacitor group is determined according to the maximum core loss value, the number of capacitors in the second compensation capacitor group, the frequency information of the test power supply and the rated voltage of the test power supply.

7. A selection device for large generator core magnetization test equipment, characterized in that: The device comprises: A first determination module, configured to determine the excitation parameters of the generator according to a preset number of turns of the excitation coil of the generator and the core parameters of the generator; the excitation parameters include a voltage value of the excitation coil and a current value of the excitation coil; A second determination module, used to determine a maximum voltage value from the voltage values ​​of the excitation coil, and to determine a maximum current value from the current values ​​of the excitation coil; A third determining module, configured to determine the cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value; A fourth determination module is used to determine the core loss value of the generator during the core magnetization test according to the core parameters of the generator, and determine the maximum core loss value of the generator during the core magnetization test from the core loss values; The fifth determination module is used to determine the equipment configuration information of the core magnetization test equipment of the generator according to the maximum core loss value, the maximum voltage value and the maximum current value.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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