Transformer turn-to-turn insulation fault simulation method and device

Abstract

The embodiment of the invention discloses a transformer turn-to-turn insulation fault simulation method and device, and the method comprises the steps: enabling a spiral coil of one cake to be equivalent to a multi-turn concentric ring according to the total number of turns, the total number of cakes, the height, the inner and outer diameters of the coils and sub-conductor data of the coils of a winding, and carrying out the simulation of filling turn-to-turn oil paper insulation between the turns of the same cake of winding, the space between the upper cake and the lower cake is equivalent to an overall transformer oil gap, and therefore a refined three-dimensional model of the transformer winding is built; building a three-dimensional model of the iron core, the oil tank and the insulation folding screen according to the actual physical size parameters of the transformer; and establishing a transformer turn-to-turn insulation fault simulation model according to the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, the oil tank and the insulation folding screen, and performing turn-to-turn insulation fault simulation according to the transformer turn-to-turn insulation fault simulation model. According to the invention, the accuracy of transformer turn-to-turn insulation fault simulation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment insulation detection and protection, and in particular to a transformer inter-turn insulation fault simulation method and device. Background Art

[0002] The transformer is an important primary equipment in the power system, responsible for adjusting the voltage level and transmitting and distributing electric energy. Its stable operation is crucial to the quality of power supply in the power grid. Among transformer failures, winding insulation failure is a common type of failure, which has a serious impact on the insulation inside the transformer. The existing transformer inter-turn insulation failure simulation has the problem of insufficient accuracy. How to accurately simulate the transformer inter-turn insulation failure is a problem that the existing technology urgently needs to solve. Summary of the invention

[0003] In order to solve at least one technical problem in the above-mentioned background technology, the present invention proposes a transformer inter-turn insulation fault simulation method and device.

[0004] In order to achieve the above object, according to one aspect of the present invention, a transformer inter-turn insulation fault simulation method is provided, the method comprising:

[0005] According to the total number of coil turns, total number of cakes, coil height, inner and outer diameters of the coil, and sub-conductor data of the winding, a spiral coil of one cake is equivalent to a multi-turn concentric ring, and the inter-turn oil-paper insulation is simulated and filled between the turns of the same cake winding, and the gap between the upper and lower cakes is equivalent to the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding;

[0006] Build the 3D model of the core, oil tank and insulation enclosure according to the actual physical size parameters of the transformer;

[0007] A transformer turn-to-turn insulation fault simulation model is established based on the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, the oil tank and the insulating enclosure, and then turn-to-turn insulation fault simulation is performed based on the transformer turn-to-turn insulation fault simulation model.

[0008] Optionally, the transformer inter-turn insulation fault simulation method further includes:

[0009] Establish a test cavity equivalent to the structure of a real transformer, place the winding of the same type of transformer in the same position in the test cavity as in the real transformer, and then conduct a partial discharge test. By conducting partial discharge tests at different positions, simulate the discharge conditions at different turn positions, and collect test data;

[0010] Performing simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data;

[0011] By comparing the simulation data with the test data, the transformer inter-turn insulation fault simulation model is verified and calibrated.

[0012] Optionally, the simulation is performed on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data, specifically including:

[0013] When performing simulation, the simulated fault source is set to be consistent with the test power source property of the partial discharge test, and the fault simulation position is selected to be the same as the test position in the partial discharge test.

[0014] Optionally, the simulation data and the test data include: high-frequency current signal waveform data of core grounding and charge quantity data of bushing grounding.

[0015] Optionally, the performing turn-to-turn insulation fault simulation according to the transformer turn-to-turn insulation fault simulation model includes:

[0016] Two sets of different signal sources are used for fault signal input to combine and restore fault signals of different properties used in simulation, and high-frequency current sensors are set at different grounding points of the transformer to extract signals; the signal source includes: a steep wave pulse signal generator and an arbitrary waveform generator; the steep wave pulse signal generator emits a double exponential wave similar to the original waveform of partial discharge, which is used to study the time domain characteristic law of high-frequency current transmission through the double exponential wave; the arbitrary waveform generator emits a self-determined square wave, which contains a variety of frequency domain information, and is used to study the frequency domain characteristic law of high-frequency current.

[0017] Optionally, according to the total number of coil turns, total number of cakes, coil height, inner and outer diameters of the coil, and sub-conductor data of the winding, a spiral coil of one cake is equivalent to a multi-turn concentric ring, and the inter-turn oil-paper insulation is simulated and filled between the turns of the same cake winding, and the gap between the upper and lower cakes is equivalent to the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding, including:

[0018] The high-voltage winding of the transformer is equivalent to a multi-piece structure composed of multiple identical coils stacked longitudinally. Each layer of coil contains a specific number of spiral sub-conductors. The insulation and struts between the coils in the vertical direction when the coils are stacked are ignored, and the longitudinal gap between the coils is equivalent to the overall transformer oil gap. For the N turns of copper sub-conductors in each coil, it is equivalent to N concentric rings with increasing radii on the same horizontal plane, and is set using the physical properties of copper. The N-1 annular gaps between the concentric rings are equivalent to turn-to-turn insulation, which also uses a circular ring structure. Its simulated physical property settings are consistent with oil-paper insulation. The radius of the innermost concentric ring is larger than the inner radius of the entire winding coil, and the radius of the outermost concentric ring is smaller than the outer radius of the entire winding coil, and the cross-sectional area of ​​each concentric ring is equal to the cross-sectional area of ​​the winding sub-conductor.

[0019] In order to achieve the above object, according to another aspect of the present invention, a transformer inter-turn insulation fault simulation device is provided, the device comprising:

[0020] The transformer winding three-dimensional model building unit is used to convert a spiral coil of one coil into multiple concentric rings according to the total number of coil turns, total number of coils, coil height, inner and outer diameters of the coil, and sub-conductor data of the winding, and simulate the filling of inter-turn oil-paper insulation between the turns of the same coil, and convert the gap between the upper and lower coils into the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding;

[0021] The three-dimensional model building unit of the iron core, oil tank and insulating screen is used to build the three-dimensional model of the iron core, oil tank and insulating screen according to the actual physical size parameters of the transformer;

[0022] The transformer interturn insulation fault simulation model establishment unit is used to establish a transformer interturn insulation fault simulation model based on the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, oil tank and insulation enclosure, and then perform interturn insulation fault simulation based on the transformer interturn insulation fault simulation model.

[0023] Optionally, the transformer inter-turn insulation fault simulation device further includes:

[0024] The partial discharge test unit is used to establish a test cavity equivalent to the structure of a real transformer, place the winding of the transformer of the same type in the test cavity at the same position as in the real transformer, and then conduct a partial discharge test. By conducting partial discharge tests at different positions, the discharge conditions at different turn positions are simulated, and the test data is collected;

[0025] A simulation unit, used to perform simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data;

[0026] The simulation model verification and calibration unit is used to perform model verification and model calibration on the transformer inter-turn insulation fault simulation model by comparing the simulation data with the test data.

[0027] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned transformer inter-turn insulation fault simulation method when executing the computer program.

[0028] In order to achieve the above object, according to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program / instruction is stored, and when the computer program / instruction is executed by a processor, the steps of the transformer inter-turn insulation fault simulation method are implemented.

[0029] The beneficial effects of the present invention are:

[0030] The embodiment of the present invention converts a spiral coil of one cake into multiple turns of concentric rings according to the total number of coil turns, the total number of cakes, the coil height, the inner and outer diameters of the coil, and the sub-conductor data of the winding, and simulates the filling of inter-turn oil-paper insulation between the turns of the same cake winding, and converts the gap between the upper and lower cakes into the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding, and then building a three-dimensional model of the iron core, oil tank and insulating screen according to the actual physical size parameters of the transformer, thereby establishing a relatively accurate transformer inter-turn insulation fault simulation model, which helps to improve the accuracy of transformer inter-turn insulation fault simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0032] Figure 1 is a first flow chart of a transformer turn-to-turn insulation fault simulation method according to an embodiment of the present invention;

[0033] Figure 2 is a second flow chart of the transformer inter-turn insulation fault simulation method according to an embodiment of the present invention;

[0034] Figure 3 is a schematic cross-sectional view of a three-dimensional winding model according to an embodiment of the present invention;

[0035] Figure 4 This is a first structural block diagram of a transformer turn-to-turn insulation fault simulation device according to an embodiment of the present invention;

[0036] Figure 5 is a second structural block diagram of the transformer inter-turn insulation fault simulation device according to an embodiment of the present invention;

[0037] Figure 6 It is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0040] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Existing transformer winding insulation research is mostly focused on simulation analysis or simulated experiments, and there is a lack of transformer winding insulation research methods that combine simulation technology with experimental verification. Therefore, in view of the actual situation of existing transformers and the internal winding structure of transformers, the present invention proposes a simulation scheme for insulation faults of real power transformer windings and its experimental verification method, which solves the problem that previous methods focus on principle equivalence and ignore the actual size structure, and constructs a more accurate simulation model according to the actual parameters of the transformer. The accuracy of the simulation method is verified by discharge experiments, thereby improving the accuracy and effect of the simulation. The method of the present invention first builds a transformer winding multi-conductor transmission line model according to the actual size parameters of a specific model of transformer and sets a simulated fault source, calculates its discharge characteristic parameters through simulation, and sets an inter-turn insulation fault at the corresponding simulated fault simulation position of the internal winding of the real transformer and performs a discharge test. The fault power supply added in the test is exactly the same as the simulation signal source. The discharge parameters are measured by experimental equipment and compared with the simulation results to verify the accuracy of the simulation model.

[0043] Figure 1 is a first flow chart of a transformer turn-to-turn insulation fault simulation method according to an embodiment of the present invention. Figure 1 As shown, in one embodiment of the present invention, the transformer inter-turn insulation fault simulation method of the present invention includes steps S101 to S103.

[0044] Step S101, according to the total number of coil turns, total number of cakes, coil height, inner and outer diameters of the coil and sub-conductor data of the winding, one cake of spiral coil is equivalent to multiple turns of concentric rings, and the inter-turn oil-paper insulation is simulated and filled between the turns of the same cake winding, and the gap between the upper and lower cakes is equivalent to the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding.

[0045] In the present invention, the total number of coil turns refers to the total number of turns of the winding, that is, how many turns the coil is wound in total. The total number of pies refers to how many pies (i.e. segments) the winding is divided into. The coil height refers to the height of the coil from the bottom to the top. The inner and outer diameters of the coil refer to the inner and outer diameters of the coil, which determine the cross-sectional area of ​​the coil. The sub-conductor data refers to the detailed parameters of the conductor in each turn, including the material, diameter, insulation thickness, etc. of the conductor.

[0046] like Figure 3 As shown, the present invention establishes a detailed three-dimensional model of the winding based on these parameters, equates the spiral coil of each winding cake to a multi-turn concentric ring, simulates the filling of inter-turn oil-paper insulation between the turns of the same cake, and equates the gap between the upper and lower cakes to the overall transformer oil gap, thereby building a detailed three-dimensional model of each winding.

[0047] Step S102, building a three-dimensional model of the iron core, oil tank and insulating enclosure according to the actual physical size parameters of the transformer.

[0048] In one embodiment of the present invention, the present invention builds a one-to-one equivalent three-dimensional model of the iron core, oil tank and insulating enclosure according to the actual physical size parameters of the transformer.

[0049] The present invention simultaneously builds three-dimensional models of the iron core, oil tank, and insulating screen, and simultaneously builds detailed three-dimensional models of each winding. When calculating the inter-turn and inter-cake capacitance, this method takes the mutual influence of windings in different parts into consideration, thereby improving the accuracy of capacitance calculation.

[0050] Step S103, establishing a transformer turn-to-turn insulation fault simulation model based on the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, the oil tank and the insulating enclosure, and then performing turn-to-turn insulation fault simulation based on the transformer turn-to-turn insulation fault simulation model.

[0051] Existing partial discharge simulation methods focus more on principle restoration. Although the degree of restoration of discharge characteristics is relatively good, the lack of actual parameter equivalent simulation model leads to a large deviation between the discharge simulation results and the actual situation. The present invention proposes a real parameter equivalent method, which builds a one-to-one equivalent model through the actual physical size parameters of a certain type of transformer, retains key structures such as the core and the screen, and refines the winding. Considering the capacitance relationship between the internal structures of the winding, a multi-conductor capacitance network equivalent model is built, thereby improving the equivalence of the simulation model.

[0052] The present invention simulates the physical structure of the winding based on the real size parameters of a specific transformer winding, realizes the modeling of the inter-turn insulation fault of any type of transformer, and solves the problem that the traditional modeling method is difficult to achieve quantitative analysis when the number of turns, number of cakes, and sub-conductor parameters of the transformer winding are different. By simultaneously incorporating the main structures such as the real transformer core and oil tank into the simulation modeling, the direct simulation of the transformer winding in the real structure is realized, solving the problem of inaccurate equivalent results caused by the previous simulation method that only considers the restoration of the winding part.

[0053] Figure 2 is a second flow chart of the transformer turn-to-turn insulation fault simulation method according to an embodiment of the present invention, such as Figure 2 As shown, in one embodiment of the present invention, the transformer inter-turn insulation fault simulation method of the present invention further includes steps S201 to S203.

[0054] Step S201, establish a test cavity equivalent to the structure of a real transformer, place the winding of the same type of transformer in the test cavity at the same position as in the real transformer, and then perform a partial discharge test. By performing partial discharge tests at different positions, simulate the discharge conditions at different turn positions, and collect test data.

[0055] Step S202, performing simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data.

[0056] Step S203 , performing model verification and model calibration on the transformer inter-turn insulation fault simulation model by comparing the simulation data with the test data.

[0057] The present invention adopts a test cavity equivalent to the structure of a real transformer to simulate the propagation process of discharge energy, places the windings of the same type of transformer at the same position in the real transformer and performs a partial discharge test, simulates the discharge conditions at different inter-turn positions through discharge experiments at different positions, and obtains the high-frequency current signal waveform of the core grounding and the charge of the bushing grounding, compares the test data with the simulation data, verifies the accuracy of the simulation model and calibrates the model, and the simulation-test joint method has high equivalence, which further improves the accuracy of the simulation model.

[0058] In one embodiment of the present invention, the above step S202 performs simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data, specifically including:

[0059] When performing simulation, the simulated fault source is set to be consistent with the test power source property of the partial discharge test, and the fault simulation position is selected to be the same as the test position in the partial discharge test.

[0060] The present invention adopts a fault source with the same properties as the test power supply to perform simulation calculation on the inter-turn discharge characteristic parameters, thereby improving the equivalence of the simulation model.

[0061] It can be seen that the present invention proposes a method combining simulation and experiment. First, a multi-conductor transmission line model of the transformer winding is built according to the actual parameters of the transformer and a fault source is set. The discharge characteristic parameters are obtained by simulation. At the same time, a fault is set between the turns of the real transformer winding and a discharge test is performed. A fault power supply with the same properties as the simulation is used, and its discharge parameters are measured by experimental equipment. The experimental and simulation results are compared to verify the accuracy of the simulation model.

[0062] In one embodiment of the present invention, the simulation data and the test data include: high-frequency current signal waveform data of core grounding and charge quantity data of bushing grounding.

[0063] In one embodiment of the present invention, the step S103 of performing turn-to-turn insulation fault simulation according to the transformer turn-to-turn insulation fault simulation model includes:

[0064] Two sets of different signal sources are used for fault signal input to combine and restore fault signals of different properties used in simulation, and high-frequency current sensors are set at different grounding points of the transformer to extract signals; the signal source includes: a steep wave pulse signal generator and an arbitrary waveform generator; the steep wave pulse signal generator emits a double exponential wave similar to the original waveform of partial discharge, which is used to study the time domain characteristic law of high-frequency current transmission through the double exponential wave; the arbitrary waveform generator emits a self-determined square wave, which contains a variety of frequency domain information, and is used to study the frequency domain characteristic law of high-frequency current.

[0065] In one embodiment of the present invention, the above step S101 is based on the total number of coil turns, the total number of cakes, the coil height, the inner and outer diameters of the coil, and the sub-conductor data of the winding, and the spiral coil of one cake is equivalent to a multi-turn concentric ring, and the inter-turn oil-paper insulation is simulated and filled between the turns of the same cake winding, and the gap between the upper and lower cakes is equivalent to the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding, which specifically includes:

[0066] The high-voltage winding of the transformer is equivalent to a multi-piece structure composed of multiple identical coils stacked longitudinally. Each layer of coil contains a specific number of spiral sub-conductors. The insulation and struts between the coils in the vertical direction when the coils are stacked are ignored, and the longitudinal gap between the coils is equivalent to the overall transformer oil gap. For the N turns of copper sub-conductors in each coil, it is equivalent to N concentric rings with increasing radii on the same horizontal plane, and is set using the physical properties of copper. The N-1 annular gaps between the concentric rings are equivalent to turn-to-turn insulation, which also uses a circular ring structure. Its simulated physical property settings are consistent with oil-paper insulation. The radius of the innermost concentric ring is larger than the inner radius of the entire winding coil, and the radius of the outermost concentric ring is smaller than the outer radius of the entire winding coil, and the cross-sectional area of ​​each concentric ring is equal to the cross-sectional area of ​​the winding sub-conductor.

[0067] Taking a real transformer high-voltage winding as an example, the high-voltage winding is a continuous structure, and the longitudinal cake structure and the horizontal turn structure of the winding need to be considered. In the simulation method of the present invention, the high-voltage winding of the transformer is equivalent to a multi-piece structure formed by stacking a plurality of identical wire cakes longitudinally through the pre-obtained total number of coil turns, total number of cakes, coil height, inner and outer diameters of the coil, and sub-conductor data, and each layer of wire cake contains a specific number of spiral sub-conductors. For the convenience of calculation, the insulation and support bars between the wire cakes in the vertical direction when the wire cakes are stacked are ignored, and the longitudinal gaps between the wire cakes are all filled with transformer oil; for the N turns of copper sub-conductors in each cake, it is equivalent to N concentric rings with increasing radii on the same horizontal plane, and is set using the physical properties of copper. The (N-1) annular gaps between each ring are equivalent to turn-to-turn insulation, and a ring structure is also used, and its simulation physical property setting is consistent with oil-paper insulation. The radius of the innermost ring is slightly larger than the inner radius of the winding coil as a whole, the radius of the outermost ring is slightly smaller than the outer radius of the winding coil as a whole, and the cross-sectional area of ​​each ring is equal to the cross-sectional area of ​​the winding sub-conductor; this simulation modeling method can be equivalent to windings of various voltage levels.

[0068] The partial cross-sectional view of the simulated three-dimensional finite element model built based on the high-voltage winding of the real transformer is shown in the figure below: Figure 3 The high-voltage winding consists of 120 coils, and each coil contains 9 turns of coil, i.e., 9 concentric copper rings and 8 inter-turn insulation gaps; the copper winding parts are shown as 1-1, 1-2…120-8, 120-9 in the figure, and the inter-turn insulation gaps are shown as the gray part marked with "C" in the figure. For every two adjacent coils, the 9 longitudinal coil capacitances C can be solved. b and 16 transverse turn-to-turn capacitors C z , where each pancake winding contains 8 lateral turn-to-turn capacitors, and the basic unit of the capacitor network is built according to the capacitors shown.

[0069] When calculating the inter-turn and inter-cake capacitance, the method of the present invention can take into account the mutual influence of windings in different positions, thereby improving the accuracy of capacitance calculation.

[0070] It can be seen from the above embodiments that the simulation and verification method of transformer inter-turn insulation fault of the present invention achieves at least the following beneficial effects:

[0071] In terms of simulation, the present invention performs full capacitor circuit equivalence on the transformer winding structure, performs local discharge energy simulation between winding turns, and controls the simulation fault source parameter settings to be consistent with the properties of the test power supply, and obtains different simulation results for different discharge positions. Based on the transformer inter-turn insulation fault simulation method described in the present invention, this patent also proposes a method for synchronously performing inter-turn insulation fault testing in a real transformer, which can simultaneously perform inter-turn insulation fault simulation and experimental verification research on a real transformer.

[0072] Since the simulation model proposed in the present invention is built based on the real physical structure of the winding, it matches the actual turn-to-turn insulation well. When conducting the turn-to-turn insulation test, the insulation fault matching the simulation can be directly set for testing, which greatly improves the matching degree between the simulation and the experiment, and helps to verify the results of the turn-to-turn insulation research. Conducting the partial discharge test of the winding, detecting the actual partial discharge characteristic parameters, and comparing and verifying the simulation results greatly improves the accuracy of the model and the ability to predict the discharge amount.

[0073] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0074] Based on the same inventive concept, an embodiment of the present invention also provides a transformer inter-turn insulation fault simulation device, which can be used to implement the transformer inter-turn insulation fault simulation method described in the above embodiment, as described in the following embodiment. Since the principle of solving the problem by the transformer inter-turn insulation fault simulation device is similar to that of the transformer inter-turn insulation fault simulation method, the embodiment of the transformer inter-turn insulation fault simulation device can refer to the embodiment of the transformer inter-turn insulation fault simulation method, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0075] Figure 4 is a first structural block diagram of a transformer turn-to-turn insulation fault simulation device according to an embodiment of the present invention, such as Figure 4 As shown, in one embodiment of the present invention, the transformer turn-to-turn insulation fault simulation device of the present invention includes:

[0076] The transformer winding three-dimensional model building unit 1 is used to convert a spiral coil of one coil into a multi-turn concentric ring according to the total number of coil turns, the total number of coils, the coil height, the inner and outer diameters of the coil, and the sub-conductor data of the winding, and simulate the filling of the inter-turn oil-paper insulation between the turns of the same coil, and convert the gap between the upper and lower coils into the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding;

[0077] The three-dimensional model building unit 2 of the iron core, oil tank and insulating enclosure is used to build the three-dimensional model of the iron core, oil tank and insulating enclosure according to the actual physical size parameters of the transformer;

[0078] The transformer inter-turn insulation fault simulation model establishing unit 3 is used to establish a transformer inter-turn insulation fault simulation model based on the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, oil tank and insulating screen, and then perform inter-turn insulation fault simulation based on the transformer inter-turn insulation fault simulation model.

[0079] Figure 5 is a second structural block diagram of the transformer inter-turn insulation fault simulation device according to an embodiment of the present invention, such as Figure 5 As shown, in one embodiment of the present invention, the transformer inter-turn insulation fault simulation device of the present invention further includes:

[0080] The partial discharge test unit 4 is used to establish a test cavity equivalent to the structure of a real transformer, place the transformer winding of the same type in the test cavity at the same position as in the real transformer, and then perform a partial discharge test, simulate the discharge conditions at different turn positions by performing partial discharge tests at different positions, and collect test data;

[0081] A simulation unit 5 is used to perform simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data;

[0082] The simulation model verification and calibration unit 6 is used to perform model verification and model calibration on the transformer inter-turn insulation fault simulation model by comparing the simulation data with the test data.

[0083] In one embodiment of the present invention, the simulation unit 5, when performing simulation, sets the simulated fault source to be consistent with the test power supply property of the partial discharge test, and selects the fault simulation position to be the same as the test position in the partial discharge test.

[0084] In one embodiment of the present invention, the transformer inter-turn insulation fault simulation device of the present invention further includes:

[0085] The turn-to-turn insulation fault simulation unit is used to use two sets of different signal sources for fault signal input to combine and restore fault signals of different properties used in simulation, and set high-frequency current sensors at different grounding points of the transformer to extract signals; the signal source includes: a steep wave pulse signal generator and an arbitrary waveform generator; the steep wave pulse signal generator emits a double exponential wave similar to the original waveform of partial discharge, which is used to study the time domain characteristic law of high-frequency current transmission through the double exponential wave; the arbitrary waveform generator emits a self-defined square wave, which contains a variety of frequency domain information, and is used to study the frequency domain characteristic law of high-frequency current.

[0086] In one embodiment of the present invention, the transformer winding three-dimensional model building unit 1 is specifically used to: equate the high-voltage winding of the transformer to a multi-piece structure formed by longitudinally stacking a plurality of identical coils, each layer of coil contains a specific number of spiral sub-conductors, and the insulation and struts between the coils in the vertical direction when the coils are stacked are ignored, and the longitudinal gaps between the coils are equivalent to the overall transformer oil gap. For the N turns of copper sub-conductors in each coil, they are equivalent to N concentric rings with increasing radii on the same horizontal plane, and are set using the physical properties of copper. The N-1 annular gaps between the concentric rings are equivalent to turn-to-turn insulation, and a circular ring structure is also used. The simulated physical property setting is consistent with the oil-paper insulation, the radius of the innermost concentric ring is larger than the inner radius of the winding coil as a whole, the radius of the outermost concentric ring is smaller than the outer radius of the winding coil as a whole, and the cross-sectional area of ​​each concentric ring is equal to the cross-sectional area of ​​the winding sub-conductor.

[0087] In order to achieve the above object, according to another aspect of the present application, a computer device is also provided. Figure 6 As shown, the computer device includes a memory, a processor, a communication interface and a communication bus. A computer program that can be executed on the processor is stored in the memory. When the processor executes the computer program, the steps in the above-mentioned embodiment method are implemented.

[0088] The processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0089] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs and units, such as the corresponding program units in the above method embodiments of the present invention. The processor executes various functional applications of the processor and works data processing by running the non-transitory software programs, instructions and modules stored in the memory, that is, implementing the method in the above method embodiments.

[0090] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0091] The one or more units are stored in the memory, and when executed by the processor, the method in the above embodiment is performed.

[0092] The specific details of the above-mentioned computer device can be understood by referring to the corresponding related descriptions and effects in the above-mentioned embodiments, and will not be repeated here.

[0093] In order to achieve the above purpose, according to another aspect of the present application, a computer-readable storage medium is also provided, wherein the computer-readable storage medium stores a computer program, and the computer program implements the steps in the above transformer inter-turn insulation fault simulation method when executed in a computer processor. Those skilled in the art can understand that the implementation of all or part of the process in the above embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and the program can include the process of the embodiment of each method as described above when executed. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (Flash Memory), a hard disk (Hard Disk Drive, abbreviated as: HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memory.

[0094] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a computer program product is further provided, comprising a computer program / instruction, which implements the steps of the above-mentioned transformer inter-turn insulation fault simulation method when executed by a processor.

[0095] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transformer interturn insulation fault simulation method, characterized in that: include: According to the total number of coil turns, total number of cakes, coil height, inner and outer diameters of the coil, and sub-conductor data of the winding, a spiral coil of one cake is equivalent to a multi-turn concentric ring, and the inter-turn oil-paper insulation is simulated and filled between the turns of the same cake winding, and the gap between the upper and lower cakes is equivalent to the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding; Build the 3D model of the core, oil tank and insulation enclosure according to the actual physical size parameters of the transformer; A transformer turn-to-turn insulation fault simulation model is established based on the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, the oil tank and the insulating enclosure, and then turn-to-turn insulation fault simulation is performed based on the transformer turn-to-turn insulation fault simulation model.

2. The transformer turn-to-turn insulation fault simulation method according to claim 1, characterized in that: Also includes: Establish a test cavity equivalent to the structure of a real transformer, place the winding of the same type of transformer in the same position in the test cavity as in the real transformer, and then conduct a partial discharge test. By conducting partial discharge tests at different positions, simulate the discharge conditions at different turn positions, and collect test data; Performing simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data; By comparing the simulation data with the test data, the transformer inter-turn insulation fault simulation model is verified and calibrated.

3. The transformer interturn insulation fault simulation method according to claim 2, characterized in that: The simulation is performed on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data, specifically including: When performing simulation, the simulated fault source is set to be consistent with the test power source property of the partial discharge test, and the fault simulation position is selected to be the same as the test position in the partial discharge test.

4. The transformer interturn insulation fault simulation method according to claim 2, characterized in that: The simulation data and the test data include: high-frequency current signal waveform data of core grounding and charge quantity data of bushing grounding.

5. The transformer interturn insulation fault simulation method according to claim 1, characterized in that: The performing turn-to-turn insulation fault simulation according to the transformer turn-to-turn insulation fault simulation model comprises: Two sets of different signal sources are used for fault signal input to combine and restore fault signals of different properties used in simulation, and high-frequency current sensors are set at different grounding points of the transformer to extract signals; the signal source includes: a steep wave pulse signal generator and an arbitrary waveform generator; the steep wave pulse signal generator emits a double exponential wave similar to the original waveform of partial discharge, which is used to study the time domain characteristic law of high-frequency current transmission through the double exponential wave; the arbitrary waveform generator emits a self-determined square wave, which contains a variety of frequency domain information, and is used to study the frequency domain characteristic law of high-frequency current.

6. The transformer interturn insulation fault simulation method according to claim 1, characterized in that: According to the total number of coil turns, total number of cakes, coil height, inner and outer diameters of the coil, and sub-conductor data of the winding, a spiral coil of one cake is equivalent to a multi-turn concentric ring, and the inter-turn oil-paper insulation is simulated and filled between the turns of the same cake winding, and the gap between the upper and lower cakes is equivalent to the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding, including: The high-voltage winding of the transformer is equivalent to a multi-piece structure composed of multiple identical coils stacked longitudinally. Each layer of coil contains a specific number of spiral sub-conductors. The insulation and struts between the coils in the vertical direction when the coils are stacked are ignored, and the longitudinal gap between the coils is equivalent to the overall transformer oil gap. For the N turns of copper sub-conductors in each coil, it is equivalent to N concentric rings with increasing radii on the same horizontal plane, and is set using the physical properties of copper. The N-1 annular gaps between the concentric rings are equivalent to turn-to-turn insulation, which also uses a circular ring structure. Its simulated physical property settings are consistent with oil-paper insulation. The radius of the innermost concentric ring is larger than the inner radius of the entire winding coil, and the radius of the outermost concentric ring is smaller than the outer radius of the entire winding coil, and the cross-sectional area of ​​each concentric ring is equal to the cross-sectional area of ​​the winding sub-conductor.

7. A transformer inter-turn insulation fault simulation device, characterized in that: include: The transformer winding three-dimensional model building unit is used to convert a spiral coil of one coil into multiple concentric rings according to the total number of coil turns, total number of coils, coil height, inner and outer diameters of the coil, and sub-conductor data of the winding, and simulate the filling of inter-turn oil-paper insulation between the turns of the same coil, and convert the gap between the upper and lower coils into the overall transformer oil gap, thereby building a detailed three-dimensional model of the transformer winding; The three-dimensional model building unit of the iron core, oil tank and insulating screen is used to build the three-dimensional model of the iron core, oil tank and insulating screen according to the actual physical size parameters of the transformer; The transformer interturn insulation fault simulation model establishment unit is used to establish a transformer interturn insulation fault simulation model based on the refined three-dimensional model of the transformer winding and the three-dimensional models of the iron core, oil tank and insulation enclosure, and then perform interturn insulation fault simulation based on the transformer interturn insulation fault simulation model.

8. The transformer inter-turn insulation fault simulation device according to claim 7, characterized in that: Also includes: The partial discharge test unit is used to establish a test cavity equivalent to the structure of a real transformer, place the winding of the transformer of the same type in the test cavity at the same position as in the real transformer, and then conduct a partial discharge test. By conducting partial discharge tests at different positions, the discharge conditions at different turn positions are simulated, and the test data is collected; A simulation unit, used to perform simulation on the transformer interturn insulation fault simulation model using the same test conditions as the partial discharge test to obtain simulation data; The simulation model verification and calibration unit is used to perform model verification and model calibration on the transformer inter-turn insulation fault simulation model by comparing the simulation data with the test data.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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

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