Lightning flashover protection method and system for double-circuit transmission line on same tower

Abstract

The invention discloses a lightning stroke flashover protection method and system for a same-tower double-circuit power transmission line, relates to the technical field of power system safety protection, and solves the problems that in the prior art, when lightning stroke flashover happens to the same-tower double-circuit power transmission line, unnecessary power failure risks are easily caused, the power supply reliability is reduced, and the system recovery time is increased. According to the embodiment of the invention, whether the first circuit line and the second circuit line meet the tripping condition or not is judged based on the operation data of the same-tower double-circuit transmission line, and the double-circuit lines are indicated to trip simultaneously under the condition that the double-circuit lines meet the tripping condition; when the first circuit line or the second circuit line does not meet the tripping condition, the first circuit line or the second circuit line is indicated to execute locking tripping or delay locking, so that unnecessary power failure risks caused by simultaneous tripping of the double circuit lines can be reduced, the power supply reliability is improved, and the system recovery time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system safety protection, and particularly relates to a lightning flashover protection method and system for a double-circuit transmission line on the same tower. BACKGROUND

[0002] In modern power systems, in order to save line corridor resources and reduce construction costs, a double-circuit transmission line on the same tower is often used. The double-circuit transmission line on the same tower refers to two independent transmission lines erected on the same tower, each of which usually has an independent protection and control system. Although this structure has obvious advantages in terms of saving land, reducing construction costs and simplifying operation and maintenance, its compact structure and small spatial distance between the two circuits result in weak anti-interference ability when encountering external disturbances (such as pollution flashover, lightning, bird damage, and ice flashover). Therefore, due to the complexity of environmental conditions (such as pollution, freezing, and thunderstorm), flashover faults often occur on insulators in actual operation. Research shows that the spatial distribution of flashover faults is obviously non-uniform, especially in mountainous areas, coastal areas, and industrial heavily polluted areas.

[0003] In existing relay protection schemes, when the controller of the double-circuit transmission line on the same tower detects a line grounding or short-circuit fault, both circuits are usually tripped at the same time to prevent the expansion of the fault. However, in the case where one line actually experiences flashover and the other line is still operating normally, such "same tripping" operation will cause unnecessary power outage risk, reduce power supply reliability, and increase system recovery time.

[0004] In view of this, there is a need for a lightning flashover protection method and system for a double-circuit transmission line on the same tower. SUMMARY

[0005] In view of the problem that the existing technology is prone to cause unnecessary power outage risk, reduce power supply reliability, and increase system recovery time, the present application provides a lightning flashover protection method and system for a double-circuit transmission line on the same tower, which can reduce unnecessary power outage risk, improve power supply reliability, and reduce system recovery time. The specific technical solutions are as follows: In a first aspect, the present application provides a lightning flashover protection method for a double-circuit transmission line on the same tower, comprising: Obtain operation data of a same-tower double-circuit transmission line, the same-tower double-circuit transmission line including a first return line and a second return line; in the case of a fault occurring in the same-tower double-circuit transmission line, determine whether the first return line and the second return line satisfy a preset tripping condition based on the operation data; in the case that the first return line satisfies the tripping condition and the second return line does not satisfy the tripping condition, send a tripping instruction to the first return line and a locking instruction to the second return line; in the case that the first return line and the second return line both satisfy the tripping condition, send the tripping instruction to the first return line and the second return line; in the case that the first return line and the second return line both do not satisfy the tripping condition, send a delayed locking instruction to the first return line and the second return line.

[0006] Preferably, the operation data includes phase voltage, phase current, phase angle, leakage current and pollution level of insulators on the same-tower double-circuit transmission line, and lightning stroke signal monitoring data; the determination of whether the first return line and the second return line satisfy the preset tripping condition based on the operation data includes: performing Bayesian fusion calculation based on the phase voltage, the phase current, the phase angle, the leakage current of the insulators, the pollution level and the lightning stroke signal monitoring data to obtain a flashover risk level of the first return line and a flashover risk level of the second return line respectively; determining whether the first return line and the second return line satisfy the tripping condition based on the flashover risk level of the first return line and the flashover risk level of the second return line.

[0007] Preferably, the determination of whether the first return line and the second return line satisfy the tripping condition based on the flashover risk level of the first return line and the flashover risk level of the second return line includes: in the case that the flashover risk level of the first return line is greater than a safety level and the position of the insulator of the first return line is a high flashover probability position, determining that the first return line satisfies the tripping condition; in the case that the flashover risk level of the second return line is greater than the safety level and the position of the insulator of the second return line is the high flashover probability position, determining that the second return line satisfies the tripping condition.

[0008] Preferably, before the determination of whether the first return line and the second return line satisfy the tripping condition based on the flashover risk level of the first return line and the flashover risk level of the second return line, the method further includes: obtaining historical insulator fault data, historical weather data and historical line structure data of the same-tower double-circuit transmission line; calculating a flashover probability of the position of each insulator on the same-tower double-circuit transmission line based on the historical insulator fault data, the historical weather data and the historical line structure data.

[0009] Preferably, in the case that the flashover risk level of the first loop line is less than or equal to the safety level, or the position of the insulator of the first loop line is not the high flashover probability position, the method further comprises: calculating a data deviation degree of each type of operation data; performing weighted calculation based on the data deviation degree of each type of operation data to obtain a comprehensive risk index; and in the case that the comprehensive risk index is greater than a preset first threshold, determining that the first loop line meets the tripping condition.

[0010] Preferably, in the case that the flashover risk level of the first loop line is less than or equal to the safety level, or the position of the insulator of the first loop line is not the high flashover probability position, the method further comprises: in the case that the flashover risk level of the first loop line is the highest risk level, or the flashover probability of the position of the insulator of the first loop line is greater than a preset second threshold, determining that the first loop line meets the tripping condition.

[0011] Preferably, after the tripping instruction and / or the locking instruction is sent, the method further comprises: obtaining the operation data after the tripping instruction and / or the locking instruction is executed; and based on the operation data, incrementally updating a tripping judgment parameter, the tripping judgment parameter being used to set the tripping condition.

[0012] In a second aspect, an embodiment of the present application provides a lightning flashover protection system of a same-tower double-loop power transmission line, applied to the method of the first aspect, and the system comprises: an obtaining module, configured to obtain operation data of a same-tower double-loop power transmission line, the same-tower double-loop power transmission line comprising a first loop line and a second loop line; a determining module, configured to, in the case that a fault occurs in the same-tower double-loop power transmission line, determine whether the first loop line and the second loop line meet a preset tripping condition based on the operation data; an instructing module, configured to, in the case that the first loop line meets the tripping condition and the second loop line does not meet the tripping condition, send a tripping instruction to the first loop line and send a locking instruction to the second loop line; the instructing module is further configured to, in the case that the first loop line and the second loop line both meet the tripping condition, send the tripping instruction to the first loop line and the second loop line; the instructing module is further configured to, in the case that the first loop line and the second loop line both do not meet the tripping condition, send a delay locking instruction to the first loop line and the second loop line.

[0013] In a third aspect, an embodiment of the present application provides a computing device, comprising: a memory configured to store a program; and a processor configured to load the program to execute the method of the first aspect.

[0014] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, the computer readable storage medium comprising a stored program, wherein the program, when executed, controls a device where the computer readable storage medium is located to perform the method according to the first aspect.

[0015] Compared with the prior art, the present application has the beneficial effects that: by judging whether the first return line and the second return line meet the tripping condition based on the operation data of the same-tower double-return transmission line, and instructing the double-return line to trip simultaneously in the case that both the double-return lines meet the tripping condition, and instructing the first return line or the second return line to perform the lockout tripping or the delay lockout in the case that the first return line or the second return line does not meet the tripping condition, the unnecessary power outage risk caused by the simultaneous tripping of the double-return line can be reduced, the power supply reliability can be improved, and the system recovery time can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments or the technical solutions in the prior art of the present application, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 A flowchart of a lightning flashover protection method for a same-tower double-return transmission line provided by an embodiment of the present application; Figure 2 A structural diagram of a lightning flashover protection system for a same-tower double-return transmission line provided by an embodiment of the present application; Figure 3 A structural diagram of a computing device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0019] It should be understood that, when used in the present specification and the appended claims, the terms “comprise” and “include” indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0020] It should also be understood that the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in the specification and the appended claims of the application, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0021] It should be further understood that the term "and / or" used in the specification and the appended claims of the application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0022] To solve the problem of unnecessary power outage risk caused by simultaneous tripping of double-circuit lines in traditional methods, reducing power supply reliability and increasing system recovery time, the application provides a lightning flashover protection method and system for double-circuit transmission lines on the same tower, which can reduce unnecessary power outage risk, improve power supply reliability, and reduce system recovery time.

[0023] Please refer to Figure 1 , Figure 1 A flowchart of a lightning flashover protection method for double-circuit transmission lines on the same tower is provided for the embodiments of the application, and the method is applied to a computing device. Figure 1 As shown in the figure, the method comprises: Step 101, the computing device acquires the operation data of the double-circuit transmission lines on the same tower.

[0024] Among them, the double-circuit transmission lines on the same tower include the first return line and the second return line.

[0025] Among them, the computing device can be a computing module or a control module arranged on the transmission line, or a server, or a personal computer or a smart terminal such as a tablet directly operated by a power system manager or a maintenance personnel; the computing device can be connected with the monitoring unit of the transmission line in a wired or wireless manner, and acquire the operation data of the transmission line collected by the monitoring unit in real time.

[0026] Preferably, the operation data includes phase voltage, phase current, phase angle, leakage current and pollution level of insulators on the double-circuit transmission lines on the same tower, and lightning signal monitoring data.

[0027] Among them, the monitoring device can include an insulator leakage current sensor, a lightning recording device, a video image recognition device, an ultra-high frequency partial discharge (UHF) detection device; and environmental sensors such as humidity, salt density and wind speed.

[0028] Specifically, each tower of the transmission line is equipped with an insulator state monitoring device (such as a leakage current sensor, an infrared imager), and each loop substation end is provided with current, voltage, zero sequence current, frequency, and other conventional quantity acquisition devices, and is equipped with lightning recording devices, on-line contamination monitors, weather stations, and image recognition auxiliary systems.

[0029] In the field of flashover detection, the contamination level is a key indicator for measuring the degree of contamination on the surface of insulating equipment, directly affecting the flashover risk assessment and maintenance strategy of the equipment. The contamination level specifically refers to a comprehensive quantitative indicator of the nature, concentration, and distribution state of the contaminants (such as dust, salt mist, industrial dust, etc.) deposited on the surface of insulating equipment (such as insulators, bushings).

[0030] The computing device can obtain an image of the insulator through the image acquisition device, and calculate the contamination level of the insulator based on the image; it can also calculate the contamination level based on the visual image, combined with one or more of the amplitude and waveform of the leakage current (the larger the current, the higher the contamination level), the infrared thermal image (the contaminants become wet, causing uneven temperature distribution on the insulating surface, which can be determined from the thermal image), and the laser-induced fluorescence data. Correspondingly, the on-line contamination detector includes an infrared camera and a laser detection device.

[0031] When the contamination level is low (0-1), the contaminants are few and weakly conductive, the flashover voltage under normal humidity is close to the clean insulation level, and only under extreme conditions such as heavy rain, it may flashover; when the contamination level is medium-high (2-4), the conductive ions (such as Na + , Cl - ) in the contaminants form a conductive film after being wet, causing uneven distribution of the insulating surface potential; partial discharge gradually develops into surface flashover, and the flashover voltage can be reduced to 30%-50% of the clean state.

[0032] It can be understood that the operating data of the transmission line obtained by the computing device of the embodiments of the present application is used to calculate the flashover risk of the insulator, so the operating data is related data that can indicate the flashover risk of the insulator.

[0033] Step 102, in the case of a fault in the same-tower double-circuit transmission line, the computing device determines whether the first loop line and the second loop line meet the pre-set trip condition based on the operating data.

[0034] The trip condition is used to indicate the characteristics of the transmission line with high flashover risk, and when the first loop line or the second loop line meets the trip condition, it means that the line currently has a high flashover risk, and the trip action needs to be performed to isolate the risk.

[0035] The trigger condition of the computing device as a trip condition determination in the case of a fault of the same-tower double-circuit transmission line can reduce unnecessary calculation and save computing resources. Meanwhile, the trigger condition can correspond to the specific application scenarios of the embodiments of the application, such as when the first return line in the double-circuit line receives a lightning strike, further determining whether to take a double-circuit line simultaneous tripping protection action or only instruct the first return line tripping protection action; for example, when a fault occurs in the double-circuit line, independent protection action determination is taken for the first return line and the second return line respectively.

[0036] It can be understood that the computing device can detect whether a fault occurs in the double-circuit line based on basic parameter data such as current, voltage and phase angle in the double-circuit line.

[0037] Preferably, the computing device can perform Bayesian fusion calculation based on the phase voltage, the phase current, the phase angle, the leakage current of the insulator, the pollution level and the lightning signal monitoring data to obtain the flashover risk level of the first return line and the flashover risk level of the second return line respectively; and determine whether the first return line and the second return line satisfy the trip condition based on the flashover risk level of the first return line and the flashover risk level of the second return line.

[0038] It can be understood that the computing device calculates the flashover risk level by using the operating data of the corresponding return line.

[0039] The computing device can calculate the following intermediate data based on the operating data: real-time leakage current value; flashover frequency under similar historical weather conditions similar to the current weather condition; lightning waveform parameters and corresponding distance; and flashover risk probability based on historical data. Then, Bayesian fusion calculation is performed based on these intermediate data to obtain the flashover risk level.

[0040] Specifically, the computing device obtains the flashover probability of the return line after Bayesian fusion calculation, and determines the corresponding flashover risk level based on the flashover probability. For example, the flashover risk level can be divided into five levels, namely low, medium, medium-high, high and highest; and the corresponding probability thresholds can be 20%, 40%, 60%, 80% and 95% respectively.

[0041] Preferably, the computing device can determine that the first return line satisfies the trip condition when the flashover risk level of the first return line is greater than a safe level and the position of the insulator of the first return line is a high flashover probability position; and determine that the second return line satisfies the trip condition when the flashover risk level of the second return line is greater than the safe level and the position of the insulator of the second return line is the high flashover probability position.

[0042] The flashover probability of the position of the insulator is obtained by the computing device through a flashover probability model trained based on historical data.

[0043] The computing device can divide the flashover probability into high, medium and low levels through a preset threshold. For example, the flashover probability can also be divided into five levels, i.e., low, medium, medium-high, high and highest, and the corresponding probability thresholds can be 20%, 40%, 60%, 80% and 95%, respectively.

[0044] When a certain loop line has a fault (such as a sudden increase in current, a sudden change in zero sequence current, etc.), the computing device can determine whether the flashover risk level is greater than the safety level, and whether the insulator position of the loop line coincides with the high-risk area in the flashover probability model. If both conditions are met, it is determined that the loop line meets the tripping condition.

[0045] Preferably, the computing device can obtain historical insulator fault data, historical weather data and historical line structure data of the same-tower double-circuit transmission line; and then calculate the flashover probability of the position of each insulator on the same-tower double-circuit transmission line based on the historical insulator fault data, the historical weather data and the historical line structure data.

[0046] The historical weather data includes humidity, wind speed, rainfall and contamination density.

[0047] The computing device can first establish the flashover probability model based on the historical data; and then input the current insulator state data, weather data and line structure data into the flashover probability model to obtain the flashover probability of each insulator in the current double-circuit line. Further, the computing device can normalize the flashover probability of each tower position and phase, integrate the flashover probability of the position of each insulator, generate a flashover probability map in combination with a geographic information system, divide different levels of risk areas, and form a risk matrix that can be used for real-time judgment.

[0048] Specifically, the computing device can use historical operation data to construct a flashover probability model for each tower position and phase in combination with a geographic information system. The flashover probability model can be modeled by using a spatial poisson process (SPP), a Gaussian mixture model (GMM) or a Kriging interpolation method.

[0049] For example, the computing device can use historical fault data of the previous 3-5 years as a basis, classify and count the flashover probability of each point according to tower position number, phase, season and weather. ; wherein, is the tower position number, to be a phase, to be a seasonal feature, to be a weather type. Then, a flashover probability map is constructed by using a spatial interpolation method to form a high-resolution non-uniform risk distribution model for real-time evaluation.

[0050] By the joint action of two conditions obtained based on historical data and current data respectively, it can be more accurately judged whether the reclosing line needs to perform tripping protection action.

[0051] Preferably, the computing device can calculate the data deviation degree of each type of operation data in the case that the flashover risk level of the first reclosing line is less than or equal to the safety level, or the insulator of the first reclosing line is not located at the high flashover probability position; perform weighted calculation based on the data deviation degree of each type of operation data to obtain a comprehensive risk index; and determine that the first reclosing line meets the tripping condition in the case that the comprehensive risk index is greater than a preset first threshold.

[0052] Among them, in the case that the indication directions of the flashover probability and the flashover equivalent level are inconsistent, the computing device can introduce operation data as the final judgment condition.

[0053] Among them, the weight of the data deviation degree of each type of operation data can be preset after expert evaluation, and then continuously updated by incremental learning.

[0054] Among them, the data deviation degree can be the difference between the data extreme value and the data mean value; or the equation or standard deviation of the operation data. After normalizing the data deviation degree, the computing device can perform weighted calculation to obtain a comprehensive risk index.

[0055] In another possible implementation, the computing device can introduce multi-dimensional criteria such as current mutation, voltage drop, leakage current rise, lightning data response, and adopt a fuzzy reasoning model to fuse these criteria to obtain the comprehensive risk index.

[0056] Preferably, the computing device can determine that the first reclosing line meets the tripping condition in the case that the flashover risk level of the first reclosing line is the highest risk level, or the flashover probability of the position where the insulator of the first reclosing line is located is greater than a preset second threshold.

[0057] In this way, even if only one of the flashover probability or the flashover risk level meets the condition, the computing device can determine that the corresponding reclosing line meets the tripping condition due to the excessively high risk indicated by the element.

[0058] In some other possible implementations, the tripping condition can also include that the current and voltage parameters fluctuate obviously; lightning or strong electric interference signal covers the same tower range; continuous abnormality exceeds the tolerance time or concurrent fault signal is detected.

[0059] Step 103, the computing device sends a trip instruction to the first loop line and a blocking instruction to the second loop line when the first loop line meets the trip condition and the second loop line does not meet the trip condition.

[0060] In the case where only the first loop line of the double-circuit transmission line meets the trip condition and the second loop line does not meet the trip condition, the computing device only instructs the first loop line to trip and simultaneously instructs the second loop line to block tripping, which can ensure the reliability of power supply continuity, reduce unnecessary power outage risk, and reduce the recovery time of the power system.

[0061] Step 104, the computing device sends the trip instruction to the first loop line and the second loop line when both the first loop line and the second loop line meet the trip condition.

[0062] In the case where both the double-circuit lines meet the trip condition, it indicates that both the double-circuit lines have a high flashover risk, and the computing device instructs both the double-circuit lines to trip, which can ensure the safety of the power system.

[0063] Step 105, the computing device sends a delay blocking instruction to the first loop line and the second loop line when neither the first loop line nor the second loop line meets the trip condition.

[0064] In the case of transient fault or instantaneous disturbance in the double-circuit line, the computing device can send a delay blocking instruction to the double-circuit line to avoid the misoperation of the protection device due to short-term abnormal signals, while ensuring fast response in the case of real fault.

[0065] If only one loop line meets the trip condition and its flashover position is a high probability point, and the other loop line has no obvious disturbance, the computing device can send a blocking instruction to the non-fault loop line; if both loop lines are in a high-risk area and have trip signs, it is judged as double-point independent flashover, and the double-circuit lines are instructed to trip simultaneously; if neither loop line has a high-risk sign or is a transient disturbance, a short delay blocking is performed and then automatically restored. The protection strategy provided by the embodiment of the application can ensure the sensitivity of the protection action while minimizing unnecessary mis-tripping.

[0066] Preferably, after sending the trip instruction and / or the blocking instruction, the computing device can obtain the running data after executing the trip instruction and / or the blocking instruction; and then based on the running data, incrementally update a trip determination parameter, which is used to set the trip condition.

[0067] After each protection action, the computing device can record information such as the flashover point, current / voltage waveform, and weather; incrementally update the tripping judgment parameters; and achieve adaptive protection optimization by automatically adjusting the setting values ​​of the protection action and the risk criterion threshold.

[0068] Specifically, during the operation of the power system, computing equipment dynamically records protection behavior and fault feedback; and recursive Bayesian learning, reinforcement learning (RL) or LSTM prediction models are used to update the criterion weights, risk thresholds and tripping delays.

[0069] For example, if blocking does not cause another line to fail to reclose or subsequent faults, the computing device can increase the blocking tolerance level; if blocking failure causes double tripping or false tripping, the computing device can decrease the blocking threshold and improve protection sensitivity; the computing device can also dynamically increase its risk level based on frequent fault points and correct the probability model. Through this data-driven mode combined with a feedback learning mechanism, long-term adaptive optimization of the protection strategy can be achieved.

[0070] In this embodiment, the system determines whether the first and second circuits meet the tripping conditions based on the operating data of the double-circuit transmission line on the same tower. If both circuits meet the tripping conditions, the system instructs both circuits to trip simultaneously. If either the first or second circuit does not meet the tripping conditions, the system instructs it to perform a blocking trip or a delayed blocking. This reduces the risk of unnecessary power outages caused by the simultaneous tripping of the two circuits, improves power supply reliability, and reduces system recovery time.

[0071] The method provided in the embodiments of this application has been described above. The system provided in the embodiments of this application will be described below.

[0072] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a lightning flashover protection system for a double-circuit transmission line on the same tower, provided in an embodiment of this application. Figure 2 As shown, the system 20 includes: The acquisition module 201 is used to acquire the operating data of a double-circuit transmission line on the same tower, which includes a first circuit and a second circuit. The judgment module 202 is used to determine, based on the operating data, whether the first circuit and the second circuit meet the preset tripping conditions in the event of a fault in the double-circuit transmission line on the same tower. The indication module 203 is used to send a trip command to the first line and a blocking command to the second line when the trip condition is met in the first line and not in the second line. The indication module 203 is further configured to send the trip instruction to the first loop line and the second loop line in the case that the trip condition is met by both the first loop line and the second loop line. The indication module 203 is further configured to send a delay lockout instruction to the first loop line and the second loop line in the case that the trip condition is not met by both the first loop line and the second loop line.

[0073] Preferably, the operation data includes phase voltage, phase current, phase angle, leakage current and pollution level of insulators on the same-tower double-circuit transmission line, and lightning stroke signal monitoring data; the determination module 202 is specifically configured to perform Bayesian fusion calculation based on the phase voltage, the phase current, the phase angle, the leakage current of the insulators, the pollution level and the lightning stroke signal monitoring data, to obtain a flashover risk level of the first loop line and a flashover risk level of the second loop line respectively; and determine whether the trip condition is met by the first loop line and the second loop line based on the flashover risk level of the first loop line and the flashover risk level of the second loop line.

[0074] Preferably, the determination module 202 is specifically configured to determine that the trip condition is met by the first loop line in the case that the flashover risk level of the first loop line is greater than a safety level and the insulators of the first loop line are located at a high flashover probability position; and determine that the trip condition is met by the second loop line in the case that the flashover risk level of the second loop line is greater than the safety level and the insulators of the second loop line are located at the high flashover probability position.

[0075] Preferably, the acquisition module 201 is further configured to acquire historical insulator fault data, historical meteorological data and historical line structure data of the same-tower double-circuit transmission line; the system 20 further includes a flashover probability module 204 configured to calculate a flashover probability of a position of each insulator on the same-tower double-circuit transmission line based on the historical insulator fault data, the historical meteorological data and the historical line structure data.

[0076] Preferably, the system 20 further includes a calculation module 205 configured to calculate data deviation degrees of various types of the operation data; perform weighted calculation based on the data deviation degrees of the various types of the operation data to obtain a comprehensive risk index; and the determination module 202 is further configured to determine that the trip condition is met by the first loop line in the case that the comprehensive risk index is greater than a preset first threshold.

[0077] Preferably, the determination module 202 is further configured to determine that the trip condition is met by the first loop line in the case that the flashover risk level of the first loop line is a highest risk level or a flashover probability of a position of the insulator of the first loop line is greater than a preset second threshold.

[0078] Preferably, the acquisition module 201 is further configured to acquire the operating data after the execution of the trip command and / or the lockout command; the system 20 also includes an update module 206, configured to incrementally update the trip determination parameters based on the operating data, the trip determination parameters being used to set the trip conditions.

[0079] The lightning flashover protection system for a double-circuit transmission line on the same tower provided in this application can be understood by referring to the relevant content in the foregoing method embodiment section, and will not be repeated here.

[0080] like Figure 3 As shown, Figure 3 This is a schematic diagram of a possible logical structure of a computing device provided in an embodiment of this application. The computing device 30 includes a processor 301, a communication interface 302, a memory 303, and a bus 304. The processor 301, the communication interface 302, and the memory 303 are interconnected via the bus 304. In an embodiment of this application, the processor 301 is used to control and manage the operation of the computing device 30. For example, the processor 301 is used to execute... Figure 1 The steps in the embodiments and / or other processes used in the techniques described herein. Communication interface 302 is used to support communication by computing device 30. Memory 303 is used to store program code and data of computing device 30.

[0081] The processor 301 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, etc. The bus 304 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0082] In another embodiment of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the above-described... Figure 1 The method described in the embodiments.

[0083] Those skilled in the art can clearly understand that the units of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components of the examples have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0084] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0085] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed system, device and method 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, and actual implementation can have another division manner. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or in other forms.

[0086] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e. they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0087] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or software functional unit.

[0088] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or all or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0089] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

Claims

1. A method for lightning flashover protection of a double-circuit transmission line on the same tower, characterized in that, The method includes: Obtain operational data of a double-circuit transmission line on the same tower, wherein the double-circuit transmission line on the same tower includes a first circuit and a second circuit; In the event of a fault in the dual-circuit transmission line on the same tower, the operating data is used to determine whether the first circuit and the second circuit meet the preset tripping conditions, which are used to indicate that the line has a high risk of flashover. If the tripping condition is met in the first circuit but not in the second circuit, a tripping command is sent to the first circuit and a blocking command is sent to the second circuit. If both the first circuit and the second circuit meet the tripping conditions, the tripping command is sent to both the first circuit and the second circuit. If neither the first line nor the second line meets the tripping conditions, a delayed blocking command is sent to both the first line and the second line.

2. The method according to claim 1, characterized in that, The operational data includes phase voltage, phase current, phase angle, leakage current and pollution level of insulators on the same tower double-circuit transmission line, as well as lightning strike signal monitoring data. The step of determining whether the first circuit and the second circuit meet the preset tripping conditions based on the operating data includes: Based on the phase voltage, phase current, phase angle, leakage current of the insulator, pollution level, and lightning strike signal monitoring data, Bayesian fusion calculation is performed to obtain the flashover risk level of the first circuit and the flashover risk level of the second circuit, respectively. Based on the flashover risk level of the first circuit and the flashover risk level of the second circuit, determine whether the first circuit and the second circuit meet the tripping conditions.

3. The method according to claim 2, characterized in that, The step of determining whether the first and second circuits meet the tripping conditions based on the flashover risk levels of the first and second circuits includes: If the flashover risk level of the first circuit is greater than the safety level, and the insulator of the first circuit is located in a high flashover probability position, then the first circuit is determined to meet the tripping condition. If the flashover risk level of the second circuit is greater than the safety level, and the insulator of the second circuit is located at the high flashover probability position, then the second circuit is determined to meet the tripping condition.

4. The method according to claim 3, characterized in that, Before determining whether the first circuit and the second circuit meet the tripping condition based on the flashover risk level of the first circuit and the flashover risk level of the second circuit, the method further includes: Acquire historical insulator fault data, historical meteorological data, and historical line structure data of the double-circuit transmission line on the same tower; Based on the historical insulator fault data, the historical meteorological data, and the historical line structure data, the flashover probability at the location of each insulator on the double-circuit transmission line on the same tower is calculated.

5. The method according to claim 3, characterized in that, If the flashover risk level of the first circuit is less than or equal to the safety level, or if the insulator of the first circuit is not located in a high flashover probability location, the method further includes: Calculate the data deviation of each type of operational data; A comprehensive risk index is obtained by weighting the data deviations of the aforementioned various operational data. If the comprehensive risk index is greater than a preset first threshold, the first circuit is determined to meet the tripping condition.

6. The method according to claim 3, characterized in that, If the flashover risk level of the first circuit is less than or equal to the safety level, or if the insulator of the first circuit is not located in a high flashover probability location, the method further includes: If the flashover risk level of the first circuit is the highest risk level, or the flashover probability at the location of the insulator of the first circuit is greater than a preset second threshold, the first circuit is determined to meet the tripping condition.

7. The method according to any one of claims 1-6, characterized in that, After sending the trip command and / or the lockout command, the method further includes: Obtain the operational data after executing the trip command and / or the lockout command; Based on the operational data, the tripping determination parameters are incrementally updated, and these parameters are used to set the tripping conditions.

8. A lightning flashover protection system for a double-circuit transmission line on the same tower, characterized in that, The system, applied to the method of any one of claims 1-7, comprises: The acquisition module is used to acquire the operating data of a double-circuit transmission line on the same tower, wherein the double-circuit transmission line on the same tower includes a first circuit and a second circuit. The judgment module is used to determine, based on the operating data, whether the first circuit and the second circuit meet the preset tripping conditions in the event of a fault in the double-circuit transmission line on the same tower. The tripping conditions are used to indicate that the line has a high flashover risk. The indicator module is used to send a trip command to the first line and a blocking command to the second line when the first line meets the tripping condition and the second line does not meet the tripping condition. The indication module is also used to send the tripping command to the first line and the second line when both the first line and the second line meet the tripping conditions; The indication module is also used to send a delayed blocking instruction to the first circuit and the second circuit if neither the first circuit nor the second circuit meets the tripping condition.

9. A computing device, characterized in that, include: Memory, used to store programs; A processor for loading the program to perform the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method of any one of claims 1-7.

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