A method and related device for analyzing the melting of high-voltage fuses in a cable distribution network

Abstract

The present application discloses a method for analyzing the blowing of a high-voltage fuse in a cable distribution network and a related device. The method includes: when a distribution network fault causes the blowing of a high-voltage fuse, obtaining fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic; building a fusing simulation model based on the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic; calculating the primary current values ​​of each level under different fault parameters according to a preset factor parameter group and a fusing simulation model, the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location; performing a fusing influence analysis through the primary current value and the preset factor parameter group to obtain a fusing analysis result. The present application can solve the technical problem that the fusing cause analysis process of the high-voltage fuse in the existing cable distribution network lacks pertinence, resulting in unsatisfactory effects of the protection measures taken.

Description

Technical Field

[0001] The present application relates to the technical field of emergency protection of distribution networks, and in particular to a method for analyzing the blowing of high-voltage fuses in cable distribution networks and related devices. Background Art

[0002] PT (electromagnetic voltage transformer) is a high-voltage device that converts high voltage electricity in the power grid into low voltage, which is convenient for monitoring and measuring voltage. Its primary winding is directly connected in parallel to the primary circuit. The existing cable-based 20kV distribution network frequently has abnormal faults of PT high-voltage side fuse blowing. The conventional 20kv distribution network line structure is shown in Figure 11, which not only affects the accurate measurement and monitoring of voltage, but also easily causes malfunction of protection devices and safety automatic devices, seriously endangering the safe and reliable operation of the distribution network. In order to carry out protection and improve system reliability, after the rated current of the PT fuse is increased, there are still many PT fuse blowing accidents. There are differences between the emerging 20kV distribution network and the traditional medium-voltage distribution network in terms of voltage level, line type, neutral point grounding method, number of outgoing lines, etc., so the main reasons for the blowing of the PT high-voltage fuse are also different. Therefore, the existing method of increasing the rated current of the PT fuse cannot effectively solve the blowing problem. Summary of the invention

[0003] The present application provides a method and related device for analyzing the blowing of high-voltage fuses in a cable distribution network, which are used to solve the technical problem that the analysis process of the blowing causes of high-voltage fuses in the existing cable distribution network lacks pertinence, resulting in unsatisfactory effects of the protective measures taken.

[0004] In view of this, the first aspect of the present application provides a method for analyzing the blowing of a high-voltage fuse in a cable distribution network, comprising:

[0005] When the high-voltage fuse is blown due to a distribution network fault, the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic are obtained;

[0006] The fault cable information includes cable parameters and cable length, the switch bus equivalent information includes equivalent power supply and equivalent load, and the PT characteristics include PT wiring type and PT excitation characteristics;

[0007] Constructing a fusing simulation model based on the fault cable information, the switch busbar equivalent information, the PT characteristics and the fault protection action logic;

[0008] Calculating the primary current value of each level under different fault parameters according to the preset factor parameter group and the fusing simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location;

[0009] A fusing influence analysis is performed using the primary-side current value and the preset factor parameter group to obtain a fusing analysis result.

[0010] Preferably, when the high-voltage fuse is blown due to a distribution network fault, obtaining fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic includes:

[0011] When a high-voltage fuse is blown due to a distribution network fault, the fault cable information in the distribution network is obtained;

[0012] Calculate the equivalent information of the switch busbars at both ends of the faulty cable based on the power flow analysis;

[0013] Record the PT characteristics of the distribution network under fault conditions, as well as the fault protection action logic.

[0014] Preferably, the primary current values ​​of each level under different fault parameters are calculated according to the preset factor parameter group and the fuse simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location, including:

[0015] If the preset factor parameter group is the PT characteristic parameter, the PT characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the PT parameter adjustment;

[0016] If the preset factor parameter group is the load size, then the load size parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the load parameter adjustment;

[0017] If the preset factor parameter group is the neutral point grounding resistance, the neutral point grounding resistance parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the neutral point grounding resistance parameter adjustment;

[0018] If the preset factor parameter group is the cable characteristic parameter, the cable characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the cable characteristic parameter adjustment;

[0019] If the preset factor parameter group is the fault location, the fault location parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the fault location parameter adjustment.

[0020] Preferably, the fusing influence analysis is performed through the primary side current value and the preset factor parameter group to obtain a fusing analysis result, and then further includes:

[0021] Configure preset protection measures according to the fuse analysis results;

[0022] The preset protection measure is simulated and verified through the fuse analysis result to obtain a verification result.

[0023] A second aspect of the present application provides a device for analyzing the blown fuse of a high-voltage fuse in a cable distribution network, comprising:

[0024] The fault information acquisition module is used to obtain the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic when the high-voltage fuse is blown due to a distribution network fault;

[0025] The fault cable information includes cable parameters and cable length, the switch bus equivalent information includes equivalent power supply and equivalent load, and the PT characteristics include PT wiring type and PT excitation characteristics;

[0026] A simulation model building module, used to build a fuse simulation model based on the fault cable information, the switch bus equivalent information, the PT characteristics and the fault protection action logic;

[0027] A simulation current calculation module, used to calculate the primary side current value of each level under different fault parameters according to a preset factor parameter group and the fuse simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location;

[0028] The fusing influence analysis module is used to perform fusing influence analysis through the primary side current value and the preset factor parameter group to obtain a fusing analysis result.

[0029] Preferably, the fault information acquisition module is specifically used to:

[0030] When a high-voltage fuse is blown due to a distribution network fault, the fault cable information in the distribution network is obtained;

[0031] Calculate the equivalent information of the switch busbars at both ends of the faulty cable based on the power flow analysis;

[0032] Record the PT characteristics of the distribution network under fault conditions, as well as the fault protection action logic.

[0033] Preferably, the simulation current calculation module is specifically used for:

[0034] If the preset factor parameter group is the PT characteristic parameter, the PT characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the PT parameter adjustment;

[0035] If the preset factor parameter group is the load size, then the load size parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the load parameter adjustment;

[0036] If the preset factor parameter group is the neutral point grounding resistance, the neutral point grounding resistance parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the neutral point grounding resistance parameter adjustment;

[0037] If the preset factor parameter group is the cable characteristic parameter, the cable characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the cable characteristic parameter adjustment;

[0038] If the preset factor parameter group is the fault location, the fault location parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the fault location parameter adjustment.

[0039] Preferably, it also includes:

[0040] A fuse protection module, used to configure preset protection measures according to the fuse analysis results;

[0041] The preset protection measure is simulated and verified through the fuse analysis result to obtain a verification result.

[0042] A third aspect of the present application provides a device for analyzing the blown fuse of a high-voltage fuse in a cable distribution network, the device comprising a processor and a memory;

[0043] The memory is used to store program code and transmit the program code to the processor;

[0044] The processor is used to execute the method for analyzing the blowing of high-voltage fuses in a cable distribution network according to the instructions in the program code.

[0045] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the method for analyzing the blowing of a high-voltage fuse in a cable distribution network described in the first aspect.

[0046] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0047] In the present application, a method for analyzing the blowing of high-voltage fuses in a cable distribution network is provided, comprising: when a distribution network fault causes the blowing of the high-voltage fuse, obtaining fault cable information, switch bus equivalent information, PT characteristics and fault protection action logic; the fault cable information includes cable parameters and cable length, the switch bus equivalent information includes equivalent power supply and equivalent load, and the PT characteristics include PT wiring type and PT excitation characteristics; a fusing simulation model is constructed based on the fault cable information, switch bus equivalent information, PT characteristics and fault protection action logic; primary side current values ​​of each level under different fault parameters are calculated according to a preset factor parameter group and the fusing simulation model, the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location; and a fusing influence analysis is performed through the primary side current value and the preset factor parameter group to obtain a fusing analysis result.

[0048] The method for analyzing the blowing of high-voltage fuses in a cable distribution network provided by the present application constructs a blowing simulation model for various characteristics of the cable distribution network, including cable information, switch busbar equivalent information, PT characteristics, and fault protection action logic, etc., so that the expression of the blowing simulation model is more accurate; and the use of the model to calculate the primary side current value under different fault parameters is a quantitative fault analysis process, analyzing the influence of different influencing factors on the fault current, so as to more accurately control the cause of the blowing, and also better ensure that the protection measures taken based on this are reliable and the effect is ideal. Therefore, the present application can solve the technical problem that the blowing cause analysis process of the high-voltage fuses in the existing cable distribution network lacks pertinence, resulting in unsatisfactory effects of the protection measures taken. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of a flow chart of a method for analyzing the blowing of a high-voltage fuse in a cable distribution network provided in an embodiment of the present application;

[0050] Figure 2 A schematic diagram of the structure of a device for analyzing the blown high-voltage fuse of a cable distribution network provided in an embodiment of the present application;

[0051] Figure 3 A schematic diagram of the circuit topology structure of a fuse simulation model in an application example of this application;

[0052] Figure 4 This is a schematic diagram of the PT primary side current waveform in the application example of this application;

[0053] Figure 5 is the primary current value at the high inflection point of the excitation characteristic curve in the application example of this application;

[0054] Figure 6 is the primary side current value at the low inflection point of the excitation characteristic curve in the application example of this application;

[0055] Figure 7 This is a curve diagram showing the influence of the neutral point grounding resistance adjustment on the primary side current value in the application example of this application;

[0056] Figure 8 This is a curve diagram showing the effect of adjusting the cable length on the primary current value in the application example of this application;

[0057] Fig. 9 This is a curve diagram showing the influence of load size adjustment on the primary current value in the application example of this application;

[0058] Fig.10 This is a PT primary current waveform diagram when the inflection point of the excitation characteristic curve is reduced and the neutral point resistance is reduced to 6.5Ω in the application example of this application;

[0059] Fig.11 This is a schematic diagram of the conventional 20kv distribution network line topology structure in the background technology of this application. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] For easier understanding, see Figure 1 , the present application provides an embodiment of a method for analyzing the blowing of a high-voltage fuse in a cable distribution network, comprising:

[0062] Step 101: When a high-voltage fuse is blown due to a distribution network fault, fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic are obtained.

[0063] The fault cable information includes cable parameters and cable length, the switch bus equivalent information includes equivalent power supply and equivalent load, and the PT characteristics include PT connection type and PT excitation characteristics.

[0064] Furthermore, step 101 includes:

[0065] When a high-voltage fuse is blown due to a distribution network fault, the fault cable information in the distribution network is obtained;

[0066] Calculate the equivalent information of the switch busbars at both ends of the faulty cable based on the power flow analysis;

[0067] Record the PT characteristics of the distribution network under fault conditions, as well as the fault protection action logic.

[0068] It should be noted that when a distribution network fails, it is necessary to determine and record the specific location of the fault, and then determine the length and parameter information of the relevant faulty cable according to the specific location of the fault, and analyze the power and load characteristics of the switch bus at both ends of the faulty cable according to the flow, and calculate the equivalent power and equivalent load, record the PT characteristics at this time, and analyze the network level where the faulty cable is located and the corresponding protection strategy and circuit breaker action relationship of the cable under different faults, that is, the fault protection action logic. It is understandable that other relevant parameters at the time of the fault can also be added according to the actual application needs, and the specific parameter types and categories are not limited, as long as they are reasonable.

[0069] Step 102: construct a fusing simulation model based on the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic.

[0070] According to the relevant parameters of the various fault moments obtained above, a fusing simulation model is constructed, and the expression ability of the model is enhanced through data at different levels. This embodiment chooses to build a simplified model of electromagnetic transient simulation analysis of 20kV distribution network PT high-voltage fuse fusing in PSCAD / EMTDC, that is, a fusing simulation model; the model specifically adopts the frequency-related model equivalent cable of the line, and the two ends of the cable are connected to the circuit breaker and PT according to the actual wiring rules, wherein the control signal of the circuit breaker is set according to the fault protection action logic; the wiring type and excitation characteristics of the PT are input according to the actual situation; the parameters of the equivalent power supply and equivalent load are set according to the calculation results; finally, a simplified model of electromagnetic transient simulation analysis of 20kV distribution network PT high-voltage fuse fusing is built according to the actual wiring.

[0071] Step 103, calculating the primary current values ​​of each level under different fault parameters according to the preset factor parameter group and the fusing simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location.

[0072] Furthermore, step 103 includes:

[0073] If the preset factor parameter group is a PT characteristic parameter, the PT characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the PT parameter adjustment;

[0074] If the preset factor parameter group is the load size, the load size parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the load parameter adjustment;

[0075] If the preset factor parameter group is the neutral point grounding resistance, the neutral point grounding resistance parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the neutral point grounding resistance parameter adjustment;

[0076] If the preset factor parameter group is a cable characteristic parameter, the cable characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the cable characteristic parameter adjustment;

[0077] If the preset factor parameter group is the fault location, the fault location parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the fault location parameter adjustment.

[0078] It can be understood that the simulation calculation of the fuse simulation model is to analyze the excitation factors, influencing factors and degree of influence of the blowing of the PT high-voltage fuse, quantitatively express it through the primary current value, and perform property analysis according to the preset factor parameter group. The adjustment of each type of parameter can calculate the corresponding primary current value according to the fuse simulation model, that is, when different faults occur at each level and corresponding protection measures are taken, the impact on the primary current value is different, so the primary current value can be used as an observation indicator for analysis.

[0079] It can be seen that in addition to the above listed parameters, other related parameters can be added to the preset factor parameter group. The specific operations are similar to the above parameters and will not be repeated here.

[0080] Step 104: Perform a fusing influence analysis based on the primary side current value and the preset factor parameter group to obtain a fusing analysis result.

[0081] Furthermore, step 104 further includes:

[0082] Configure preset protection measures based on the fuse analysis results;

[0083] The preset protection measures are simulated and verified through the fuse analysis results to obtain the verification results.

[0084] Accurately determining the influencing factors and degree of high-voltage fuse blowing can provide reliable theoretical support for configuring preset protection measures, thereby ensuring the effectiveness of the preset protection measures.

[0085] To facilitate understanding, the application example of this application provides a simplified simulation analysis case of a blown PT high-voltage fuse in a long cable line of a 20kV distribution network. The cable model is ZR-YJV22-18-20kV-3*300, and the length is 3.844km. It is determined that the faulty cable is in the backbone layer of the system, so its protection is network topology protection, and the protection logic is set to disconnect the circuit breakers at both ends of the faulty cable 0.01s after the fault occurs. The equivalent voltage source and equivalent load of the switch station nodes connected to both ends of the cable are calculated based on the flow analysis.

[0086] See also Figure 3, a fusing simulation model is constructed based on the obtained parameters, the equivalent power line voltage effective value is taken as 20kv, the equivalent reactance is removed as 0.001H, and the equivalent load is taken as 30MVA. The simulation analysis is specifically: simulate and calculate the PT primary side current waveform, and by changing different parameters, simulate and analyze the influence of different influencing factors on the PT primary side current. Figure 4 is the primary current of PT, t1 is the moment when the circuit breaker is disconnected, and the circuit breaker disconnection triggers PT overcurrent. Figure 5 , Figure 6 The peak values ​​of the PT primary current obtained by increasing and decreasing the inflection point of the excitation characteristic curve are 0.743 A and 1.203 A respectively. As can be seen from the curve graph, increasing the inflection point of the excitation characteristic curve can effectively suppress the current. Figure 7 , Figure 8 , Fig. 9 They are the effects of neutral point grounding resistance, cable length and load size on PT overcurrent. From the overall trend, PT overcurrent can be suppressed by reducing the neutral point grounding resistance, reducing the cable length, and reducing the load rate.

[0087] During the design stage, the PT overcurrent can be suppressed by lowering the inflection point of the PT excitation characteristic curve, reducing the load rate, reducing the cable length, and reducing the neutral point grounding resistance, thereby reducing the occurrence of PT high-voltage fuse failures.

[0088] During the operation phase, the PT overcurrent can be suppressed by reducing the neutral point grounding resistance and the inflection point of the PT excitation characteristic curve to avoid the PT high-voltage fuse from blowing. By reducing the inflection point of the excitation characteristic curve and lowering the neutral point resistance to 6.5Ω, the PT primary current waveform is obtained as follows: Fig.10 As shown in the figure, the peak current of the PT primary side is reduced from 0.906A to 0.375A.

[0089] The method for analyzing the blowing of high-voltage fuses in a cable distribution network provided in the embodiment of the present application constructs a blowing simulation model for various characteristics of the cable distribution network, including cable information, switch busbar equivalent information, PT characteristics, and fault protection action logic, etc., so that the expression of the blowing simulation model is more accurate; and the use of the model to calculate the primary side current value under different fault parameters is a quantitative fault analysis process, analyzing the influence of different influencing factors on the fault current, so as to more accurately control the cause of the blowing, and also better ensure that the protection measures taken based on this are reliable and the effect is ideal. Therefore, the embodiment of the present application can solve the technical problem that the blowing cause analysis process of the high-voltage fuses in the existing cable distribution network lacks pertinence, resulting in unsatisfactory effects of the protection measures taken.

[0090] For easier understanding, see Figure 2 The present application provides an embodiment of a device for analyzing the blown fuse of a high-voltage fuse in a cable distribution network, comprising:

[0091] The fault information acquisition module 201 is used to obtain the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic when the high-voltage fuse is blown due to a distribution network fault;

[0092] Fault cable information includes cable parameters and cable length, switch bus equivalent information includes equivalent power supply and equivalent load, PT characteristics include PT wiring type and PT excitation characteristics;

[0093] A simulation model building module 202 is used to build a fuse simulation model based on fault cable information, switch bus equivalent information, PT characteristics and fault protection action logic;

[0094] The simulation current calculation module 203 is used to calculate the primary current value of each level under different fault parameters according to the preset factor parameter group and the fuse simulation model, and the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location;

[0095] The fusing influence analysis module 204 is used to perform fusing influence analysis through the primary side current value and the preset factor parameter group to obtain a fusing analysis result.

[0096] Furthermore, the fault information acquisition module 201 is specifically used for:

[0097] When a high-voltage fuse is blown due to a distribution network fault, the fault cable information in the distribution network is obtained;

[0098] Calculate the equivalent information of the switch busbars at both ends of the faulty cable based on the power flow analysis;

[0099] Record the PT characteristics of the distribution network under fault conditions, as well as the fault protection action logic.

[0100] Furthermore, the simulation current calculation module 203 is specifically used for:

[0101] If the preset factor parameter group is a PT characteristic parameter, the PT characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the PT parameter adjustment;

[0102] If the preset factor parameter group is the load size, the load size parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the load parameter adjustment;

[0103] If the preset factor parameter group is the neutral point grounding resistance, the neutral point grounding resistance parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the neutral point grounding resistance parameter adjustment;

[0104] If the preset factor parameter group is a cable characteristic parameter, the cable characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the cable characteristic parameter adjustment;

[0105] If the preset factor parameter group is the fault location, the fault location parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the fault location parameter adjustment.

[0106] Furthermore, it also includes:

[0107] Fuse protection module 205, used to configure preset protection measures according to the fuse analysis results;

[0108] The preset protection measures are simulated and verified through the fuse analysis results to obtain the verification results.

[0109] The present application also provides a device for analyzing the blown fuse of a high-voltage fuse in a cable distribution network, the device comprising a processor and a memory;

[0110] The memory is used to store the program code and transmit the program code to the processor;

[0111] The processor is used to execute the method for analyzing the blowing of high-voltage fuses in the cable distribution network in the above method embodiment according to the instructions in the program code.

[0112] The present application also provides a computer-readable storage medium, which is used to store program codes, and the program codes are used to execute the method for analyzing the blowing of high-voltage fuses in a cable distribution network in the above method embodiment.

[0113] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0114] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0115] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0116] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for executing all or part of the steps of the method described in each embodiment of the present application through a computer device (which can be a personal computer, a server, or a network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0117] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for analyzing the blowing of a high-voltage fuse in a cable distribution network, characterized in that: include: When the high-voltage fuse is blown due to a distribution network fault, the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic are obtained; The fault cable information includes cable parameters and cable length, the switch bus equivalent information includes equivalent power supply and equivalent load, and the PT characteristics include PT wiring type and PT excitation characteristics; Constructing a fusing simulation model based on the fault cable information, the switch busbar equivalent information, the PT characteristics and the fault protection action logic; Calculating the primary current value of each level under different fault parameters according to the preset factor parameter group and the fusing simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location; A fusing influence analysis is performed using the primary-side current value and the preset factor parameter group to obtain a fusing analysis result.

2. The method for analyzing the blowing of a high-voltage fuse in a cable distribution network according to claim 1, characterized in that: When the high-voltage fuse is blown due to a distribution network fault, the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic are obtained, including: When a high-voltage fuse is blown due to a distribution network fault, the fault cable information in the distribution network is obtained; Calculate the equivalent information of the switch busbars at both ends of the faulty cable based on the power flow analysis; Record the PT characteristics of the distribution network under fault conditions, as well as the fault protection action logic.

3. The method for analyzing the blowing of a high-voltage fuse in a cable distribution network according to claim 1, characterized in that: The primary current values ​​of each level under different fault parameters are calculated according to the preset factor parameter group and the fuse simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location, including: If the preset factor parameter group is the PT characteristic parameter, the PT characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the PT parameter adjustment; If the preset factor parameter group is the load size, then the load size parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the load parameter adjustment; If the preset factor parameter group is the neutral point grounding resistance, the neutral point grounding resistance parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the neutral point grounding resistance parameter adjustment; If the preset factor parameter group is the cable characteristic parameter, the cable characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the cable characteristic parameter adjustment; If the preset factor parameter group is the fault location, the fault location parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the fault location parameter adjustment.

4. The method for analyzing the blowing of a high-voltage fuse in a cable distribution network according to claim 1, characterized in that: The fusing influence analysis is performed by using the primary side current value and the preset factor parameter group to obtain a fusing analysis result, and then further includes: Configure preset protection measures according to the fuse analysis results; The preset protection measure is simulated and verified through the fuse analysis result to obtain a verification result.

5. A device for analyzing the blown high voltage fuse of a cable distribution network, characterized in that: include: The fault information acquisition module is used to obtain the fault cable information, switch busbar equivalent information, PT characteristics and fault protection action logic when the high-voltage fuse is blown due to a distribution network fault; The fault cable information includes cable parameters and cable length, the switch bus equivalent information includes equivalent power supply and equivalent load, and the PT characteristics include PT wiring type and PT excitation characteristics; A simulation model building module, used to build a fuse simulation model based on the fault cable information, the switch bus equivalent information, the PT characteristics and the fault protection action logic; A simulation current calculation module, used to calculate the primary side current value of each level under different fault parameters according to a preset factor parameter group and the fuse simulation model, wherein the preset factor parameter group includes PT characteristic parameters, load size, neutral point grounding resistance, cable characteristic parameters and fault location; The fusing influence analysis module is used to perform fusing influence analysis through the primary side current value and the preset factor parameter group to obtain a fusing analysis result.

6. The device for analyzing the blown high voltage fuse of a cable distribution network according to claim 5, characterized in that: The fault information acquisition module is specifically used for: When a high-voltage fuse is blown due to a distribution network fault, the fault cable information in the distribution network is obtained; Calculate the equivalent information of the switch busbars at both ends of the faulty cable based on the power flow analysis; Record the PT characteristics of the distribution network under fault conditions, as well as the fault protection action logic.

7. The device for analyzing the blown high voltage fuse of a cable distribution network according to claim 5, characterized in that: The simulation current calculation module is specifically used for: If the preset factor parameter group is the PT characteristic parameter, the PT characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the PT parameter adjustment; If the preset factor parameter group is the load size, then the load size parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the load parameter adjustment; If the preset factor parameter group is the neutral point grounding resistance, the neutral point grounding resistance parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the neutral point grounding resistance parameter adjustment; If the preset factor parameter group is the cable characteristic parameter, the cable characteristic parameter group in the fusing simulation model is adjusted to obtain the primary side current value of each level under the cable characteristic parameter adjustment; If the preset factor parameter group is the fault location, the fault location parameter group in the fuse simulation model is adjusted to obtain the primary side current value of each level under the fault location parameter adjustment.

8. The device for analyzing the blown high voltage fuse of a cable distribution network according to claim 5, characterized in that: Also includes: A fuse protection module, used to configure preset protection measures according to the fuse analysis results; The preset protection measure is simulated and verified through the fuse analysis result to obtain a verification result.

9. A device for analyzing the blown high voltage fuse of a cable distribution network, characterized in that: The device comprises a processor and a memory; The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the method for analyzing the blowing of a high-voltage fuse in a cable distribution network according to any one of claims 1 to 4 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program codes, and the program codes are used to execute the method for analyzing the blowing of high-voltage fuses in a cable distribution network according to any one of claims 1 to 4.

Images