Method and system for calculating action times of lightning arrester of power transmission line

Abstract

The invention provides a power transmission line lightning arrester action frequency calculation method and system, and the method comprises the steps: calculating the thunderbolt frequency of a lightning arrester installation tower based on the line characteristic parameters of a power transmission line and the thunder and lightning parameters of the lightning arrester installation tower on the power transmission line; based on the line characteristic parameters, respectively calculating the lightning arrester mounting tower striking rate and the wire shielding failure rate by adopting an empirical analysis method and a wire shielding failure rate calculation formula; based on the thunderbolt times, the lightning arrester installation tower pole striking rate and the wire shielding failure rate, combining the lightning counterattack current when the lightning arrester acts and the shielding failure current when the lightning arrester acts, and adopting a lightning arrester action times calculation formula to calculate the lightning arrester action times at the lightning arrester installation tower; according to the calculation method, thunder and lightning activity characteristics of the environment where the actual line is located are fully considered, so that the calculation result is closer to the real thunder and lightning risk level of the line and the actual working scene of the lightning arrester.

Description

TECHNICAL FIELD

[0001] The patent application belongs to the technical field of power transmission line operation and maintenance, and particularly relates to a method and system for calculating the action times of a lightning arrester of a power transmission line. BACKGROUND

[0002] Lightning is a kind of sound, light, electromagnetic and multi-physical phenomenon frequently occurring in nature, and is listed as one of the top ten natural disasters by the United Nations. According to statistics, the power grid in China suffers from lightning more than 400,000 times per year, and lightning is the primary cause of power grid failure, accounting for as high as 50%. Frequent lightning causes damage to electrical equipment and even major safety accidents. With the development of social economy, the power consumption of users has increased dramatically, and the scale of overhead transmission networks has become larger and larger. Overhead lines have the characteristics of many points, long lines and wide areas, and the natural environment in which they are located is often complex, which brings greater challenges to the stable and reliable operation of the power grid. Key lightning protection devices of the line, such as lightning arresters, grounding devices and line fault diagnosis devices, are a powerful guarantee for the safe and stable operation of the line. However, in the current situation where the line environment is becoming increasingly complex, the operation and maintenance of key lightning protection devices of the line are gradually increasing in difficulty, affecting the stability of the power grid. The lightning arrester is one of the important protection devices for the safe operation of the power transmission line. Influenced by the operating environment and production process, some lightning arresters show insulation aging and increased leakage current in long-term outdoor operation. This condition will directly lead to a significant reduction or even failure of the lightning protection performance of the lightning arrester, causing great safety hazards to the operation of the power grid.

[0003] At present, the lightning arrester is configured with a mechanical counter, which mainly relies on manual on-site telescope or tower climbing to read data. Some areas have a small amount of remote data transmission function, but there are still many problems in power supply reliability, communication stability, transmission distance, data storage and data utilization, which cannot meet the real-time and accuracy requirements of the current power grid. At the same time, with the increasing strictness of information security requirements, the generation, transmission, reception, display and use of data need to meet the relevant safety regulations of the power grid, so that the matching background software has very high requirements in safety.

[0004] In terms of data utilization, the conventional counter mainly records the action times of the lightning arrester, and the data is single and isolated, lacking information such as action time, action time surrounding lightning activity, etc., and it is difficult to reliably measure the action reliability and protection effectiveness of the lightning arrester. SUMMARY

[0005] To overcome the deficiencies of the prior art, the patent application provides a method for calculating the action times of a lightning arrester of a power transmission line, which comprises:

[0006] Based on the line characteristic parameters of the power transmission line and the lightning parameters of the lightning arrester installation tower on the power transmission line, the number of lightning strikes of the lightning arrester installation tower is calculated.

[0007] Based on the line characteristic parameters, the tower striking rate of the lightning arrester installation tower and the conductor striking rate are calculated respectively by using an empirical analysis method and a conductor striking rate calculation formula;

[0008] Based on the lightning striking number, the tower striking rate of the lightning arrester installation tower, the conductor striking rate, the lightning back strike current when the lightning arrester acts and the striking current when the lightning arrester acts, the action number of the lightning arrester at the lightning arrester installation tower is calculated by using a lightning arrester action number calculation formula.

[0009] Preferably, the lightning striking number of the lightning arrester installation tower is calculated based on the line characteristic parameters of the transmission line and the lightning parameters of the lightning arrester installation tower on the transmission line, and the lightning striking number calculation formula is as follows:

[0010] The front and rear half span of each lightning arrester installation tower on the transmission line is taken as a lightning striking number statistical interval of the lightning arrester installation tower;

[0011] Based on the line characteristic parameters of the transmission line and the lightning parameters of the lightning arrester installation tower on the transmission line, the lightning striking number of each lightning arrester installation tower in the lightning striking number statistical interval per year is calculated by using the lightning striking number calculation formula.

[0012] The line characteristic parameters at least include one or more of the following: line basic information, tower structure, transmission line corridor topography, number of overhead ground wires, protection angle of the lightning conductor and height of the lightning arrester installation tower; the lightning parameters at least include one or more of the following: ground flash density and lightning current amplitude cumulative probability distribution of the lightning arrester installation tower.

[0013] Preferably, the lightning striking number calculation formula is as follows:

[0014]

[0015] Wherein, N T is the lightning striking number of the lightning arrester installation tower in the lightning striking number statistical interval per year, N gT is the ground flash density of the lightning arrester installation tower, h T is the height of the lightning arrester installation tower, b is the distance between the two overhead ground wires, L1 is the small side span, and L2 is the large side span.

[0016] Preferably, the conductor striking rate calculation formula includes a plain transmission line conductor striking rate calculation formula and a mountainous area transmission line conductor striking rate calculation formula; the tower striking rate of the lightning arrester installation tower and the conductor striking rate are calculated respectively based on the line characteristic parameters by using an empirical analysis method and a conductor striking rate calculation formula, and the conductor striking rate calculation formula is as follows:

[0017] Based on the topography of the transmission line corridor and the number of overhead ground wires, the empirical analysis method was used to obtain the strike rate of the surge arrester installation towers in plain terrain and the strike rate of the surge arrester installation towers in mountainous terrain where the transmission line is located.

[0018] Based on the protection angle of the lightning protection wire to the side conductor and the height of the lightning arrester tower, the calculation formulas for the conductor strike rate of transmission lines in plains and mountainous areas are adopted to calculate the conductor strike rate of transmission lines in plains and mountainous areas respectively.

[0019] Preferably, the formula for calculating the conductor entanglement rate of the plain transmission line is as follows:

[0020]

[0021] Among them, P α1 h represents the conductor snagging rate of transmission lines in plains areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0022] Preferably, the formula for calculating the conductor entanglement rate of the mountain transmission line is as follows:

[0023]

[0024] Among them, P α2 h represents the conductor snagging rate of power transmission lines in mountainous areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0025] Preferably, the calculation formula for the number of surge arrester operations is as follows:

[0026] N B =P β N T P(>I 反 )+P α N T P(>I 绕 )

[0027] Where, N B P represents the number of times the surge arrester at the tower where the surge arrester is installed. β The strike rate of surge arresters installed on towers in plain terrain or mountainous terrain for transmission lines, N. T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, P α For the conductor winding failure rate of transmission lines in plains or mountainous areas, I 反 P(>I) is the lightning backflash current when the surge arrester operates. 反 () indicates that the lightning current amplitude is greater than I 反The probability, I 绕 The surge current when the surge arrester operates, P(>I) 绕 () indicates that the lightning current amplitude is greater than I 绕 The probability of.

[0028] Preferably, the magnitude of the lightning backflash current and the magnitude of the surge arrester's backflash current are determined based on the voltage level and the series gap value.

[0029] Based on the same inventive concept, this patent application also provides a system for calculating the number of times a surge arrester operates on a power transmission line, including: a lightning strike count calculation module, a strike rod bypass rate calculation module, and a surge arrester operation count calculation module.

[0030] The lightning strike count calculation module is used to calculate the number of lightning strikes on the lightning arrester installation tower based on the line characteristic parameters of the transmission line and the lightning parameters of the lightning arrester installation tower on the transmission line.

[0031] The strike-off rate calculation module is used to calculate the strike-off rate of the arrester installation tower and the conductor strike-off rate based on the line characteristic parameters, using empirical analysis and conductor strike-off rate calculation formula, respectively.

[0032] The surge arrester operation count calculation module is used to calculate the surge arrester operation count at the surge arrester installation tower based on the number of lightning strikes, the surge arrester installation tower strike rate, the conductor backflash rate, the lightning backflash current when the surge arrester operates, and the surge arrester backflash current when the surge arrester operates, using the surge arrester operation count calculation formula.

[0033] Preferably, the lightning strike count calculation module is specifically used for:

[0034] The first and second half spans of each surge arrester installation tower on the transmission line are used as the statistical interval for the number of lightning strikes on the surge arrester installation tower.

[0035] Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, the lightning strike count calculation formula is used to calculate the number of lightning strikes per year for each surge arrester installation tower within the lightning strike count statistical interval.

[0036] The line characteristic parameters include at least one or more of the following: basic line information, tower structure, transmission line corridor topography, number of overhead ground wires, protection angle of lightning conductors to side conductors, and height of lightning arrester towers; the lightning parameters include at least one or more of the following: ground flash density and cumulative probability distribution of lightning current amplitude of lightning arrester towers.

[0037] Preferably, the formula for calculating the number of lightning strikes is as follows:

[0038]

[0039] Where, N T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, N. gT The ground flash density of the tower where the surge arrester is installed, h T The height of the tower where the surge arrester is installed, b is the distance between the two overhead ground wires, L1 is the small side span distance, and L2 is the large side span distance.

[0040] Preferably, the conductor inrush rate calculation formula includes: a conductor inrush rate calculation formula for plain transmission lines and a conductor inrush rate calculation formula for mountain transmission lines; the strike rod inrush rate calculation module is specifically used for:

[0041] Based on the topography of the transmission line corridor and the number of overhead ground wires, the empirical analysis method was used to obtain the strike rate of the surge arrester installation towers in plain terrain and the strike rate of the surge arrester installation towers in mountainous terrain where the transmission line is located.

[0042] Based on the protection angle of the lightning protection wire to the side conductor and the height of the lightning arrester tower, the calculation formulas for the conductor strike rate of transmission lines in plains and mountainous areas are adopted to calculate the conductor strike rate of transmission lines in plains and mountainous areas respectively.

[0043] Preferably, the formula for calculating the conductor entanglement rate of the plain transmission line is as follows:

[0044]

[0045] Among them, P α1 h represents the conductor snagging rate of transmission lines in plains areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0046] Preferably, the formula for calculating the conductor entanglement rate of the mountain transmission line is as follows:

[0047]

[0048] Among them, P α2 h represents the conductor snagging rate of power transmission lines in mountainous areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0049] Preferably, the calculation formula for the number of surge arrester operations is as follows:

[0050] N B =P β N T P(>I 反 )+P α N T P(>I绕 )

[0051] Where, N B P represents the number of times the surge arrester at the tower where the surge arrester is installed. β The strike rate of surge arresters installed on towers in plain terrain or mountainous terrain for transmission lines, N. T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, P α For the conductor winding failure rate of transmission lines in plains or mountainous areas, I 反 P(>I) is the lightning backflash current when the surge arrester operates. 反 () indicates that the lightning current amplitude is greater than I 反 The probability, I 绕 The surge current when the surge arrester operates, P(>I) 绕 () indicates that the lightning current amplitude is greater than I 绕 The probability of.

[0052] Preferably, the magnitude of the lightning backflash current and the magnitude of the surge arrester's backflash current are determined based on the voltage level and the series gap value.

[0053] Based on the same inventive concept, this patent application also provides an electronic device, comprising: at least one processor and a memory; wherein the memory and the processor are connected via a bus.

[0054] The memory is used to store one or more programs;

[0055] When the one or more programs are executed by the at least one processor, a method for calculating the number of operations of a surge arrester on a transmission line, as described above, is implemented.

[0056] Based on the same inventive concept, this patent application also provides a readable storage medium on which a computer program is stored, and an executable program is stored thereon. When the executable program is executed, it implements the method for calculating the number of times a surge arrester operates as described above.

[0057] Compared with the closest prior art, the beneficial effects of this invention patent application are as follows:

[0058] This invention patent application provides a method and system for estimating the number of surge arrester operations on transmission lines, comprising: calculating the number of lightning strikes on the surge arrester installation towers based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line; calculating the tower strike rate and conductor backflashover rate of the surge arrester installation towers based on the line characteristic parameters using empirical analysis and conductor backflashover rate calculation formulas; and calculating the number of surge arrester operations at the surge arrester installation towers based on the number of lightning strikes, tower strike rate, and conductor backflashover rate, combined with the lightning backflash current and backflashover current during surge arrester operation, using the surge arrester operation count calculation formula. This invention utilizes the line characteristic parameters of transmission lines, the lightning parameters of the surge arrester installation towers, the lightning backflash current when the surge arrester operates, and the backflash current when the surge arrester operates to calculate the number of surge arrester operations on transmission lines, thereby improving the safe and stable operation level of the lines. This calculation method fully considers the lightning activity characteristics of the actual line environment, making the calculation results closer to the actual lightning risk level of the line and the actual working scenario of the surge arrester. This significantly improves the scientific nature of the calculation results and their conformity to actual lightning changes. Compared with traditional methods that rely solely on the number of single operations, this method provides a more comprehensive basis for evaluating whether the surge arrester operates normally and its protective effect. Attached Figure Description

[0059] Figure 1 A flowchart illustrating a method for calculating the number of operations of a surge arrester on a power transmission line, provided in this patent application.

[0060] Figure 2 Overall flowchart of the method for calculating the number of operation times of a surge arrester on a transmission line, provided in this patent application;

[0061] Figure 3 A schematic diagram of a system for calculating the number of operations of a surge arrester on a power transmission line, provided in this patent application;

[0062] Figure 4 This is a schematic diagram of the structure of an electronic device provided in this patent application. Detailed Implementation

[0063] The specific embodiments of this patent application will be further described in detail below with reference to the accompanying drawings.

[0064] Example 1:

[0065] This invention patent application provides a method for calculating the number of times a surge arrester operates on a power transmission line, as follows: Figure 1 As shown, it includes:

[0066] Step 1: Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, calculate the number of lightning strikes on the surge arrester installation towers;

[0067] Step 2: Based on the line characteristic parameters, the strike rate of the arrester installation tower and the strike rate of the conductor are calculated using the empirical analysis method and the conductor backflash rate calculation formula, respectively.

[0068] Step 3: Based on the number of lightning strikes, the strike rate of the arrester installation tower, and the conductor backflash rate, combined with the lightning backflash current and the backflash current when the arrester operates, the arrester operation count is calculated using the arrester operation count formula.

[0069] In one implementation, step 1 above, which calculates the number of lightning strikes on the surge arrester-mounted tower based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester-mounted tower on the transmission line, includes:

[0070] The first and second half spans of each surge arrester installation tower on the transmission line are used as the statistical interval for the number of lightning strikes on the surge arrester installation tower.

[0071] Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, the lightning strike count calculation formula is used to calculate the number of lightning strikes per year for each surge arrester installation tower within the lightning strike count statistical interval.

[0072] For example, the above transmission line is the target transmission line, that is, to obtain the line characteristic parameters of the target transmission line and the lightning parameters of the surge arrester installation towers on the target transmission line;

[0073] The number of lightning strikes per 100km of transmission line per year can be calculated using the following formula:

[0074] N L =0.1N g (28h T 0.6 +b)

[0075] Where, N L N represents the number of lightning strikes per 100km of transmission lines per year. g h is the ground flash density. T 'b' represents the tower height, and 'b' represents the distance between the two overhead ground wires. The overhead ground wire and the surge arrester are two key lines of defense in the lightning protection system for overhead power line towers. Their relationship is one of "synergy and complementarity, with clear distinction between primary and secondary protection." The ground wire provides overall protection, while the surge arrester provides local protection. The surge arrester is installed on the tower, which also has an overhead ground wire.

[0076] The line characteristic parameters include at least one or more of the following: basic line information, tower structure, transmission line corridor topography, number of overhead ground wires, protection angle of the lightning conductor to the side conductor, and height of the arrester tower; the lightning parameters include at least one or more of the following: ground flash density and cumulative probability distribution of lightning current amplitude of the arrester tower; this invention significantly improves the accuracy of spatial attribution of lightning events by clearly defining the half span before and after each arrester tower as the statistical interval for the number of lightning strikes, avoiding duplicate counting or omissions caused by interval ambiguity in traditional statistical methods, and providing a reliable data foundation; further, by combining multi-dimensional line characteristic parameters such as basic line information, tower structure, and corridor topography, as well as lightning parameters such as ground flash density and probability distribution of lightning current amplitude, the annual number of lightning strikes for each arrester tower is accurately calculated using the lightning strike count calculation formula, fully reflecting the uneven distribution of lightning strike risk caused by differences in structure, topography, and lightning activity characteristics of transmission lines in different sections, making the calculation results more consistent with actual working conditions.

[0077] In one implementation, the formula for calculating the number of lightning strikes is as follows:

[0078]

[0079] Where, N T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, N. gT The ground flash density of the tower where the surge arrester is installed, h T The height of the tower where the surge arrester is installed, b is the distance between the two overhead ground wires, L1 is the small side span distance, and L2 is the large side span distance.

[0080] In one implementation, the formula for calculating the conductor strike rate includes: a formula for calculating the conductor strike rate of transmission lines in plains areas and a formula for calculating the conductor strike rate of transmission lines in mountainous areas; step 2 above, based on the line characteristic parameters, uses empirical analysis and the conductor strike rate calculation formula to calculate the tower strike rate of the surge arrester and the conductor strike rate, respectively, including:

[0081] Based on the topography of the transmission line corridor and the number of overhead ground wires, the empirical analysis method was used to obtain the strike rate of the surge arrester installation towers in plain terrain and the strike rate of the surge arrester installation towers in mountainous terrain where the transmission line is located.

[0082] Based on the protection angle of the lightning protection wire to the side conductor and the height of the lightning arrester tower, the calculation formulas for the conductor strike rate of transmission lines in plains and mountainous areas are adopted to calculate the conductor strike rate of transmission lines in plains and mountainous areas respectively.

[0083] For example, based on the calculation formula for conductor backlash rate and the recommended values ​​obtained through empirical analysis, combined with the structural parameters of the surge arrester tower, the strike rate and conductor backlash rate of the surge arrester tower are calculated respectively. The strike rate is related to the number of overhead ground wires and the terrain. Table 1 shows the strike rate obtained through empirical analysis. The strike rate of the surge arrester tower is calculated using the empirical analysis method, as shown in Table 1 below:

[0084] Table 1. Striking Rate Based on Empirical Analysis

[0085]

[0086] The probability of lightning bypassing the lightning protection wire and striking the conductor directly is related to the protection angle of the lightning protection wire to the conductor, the tower height, and the terrain, landform, and geological conditions of the area through which the line passes. Generally, the protection angle of towers with high risk of lightning strikes is specified for general lines, as shown in Table 2:

[0087] Table 2 Protection Angles for High-Risk Towers in General Line Strike Strategies

[0088]

[0089] This invention, based on the topography and number of overhead ground wires along transmission line corridors, uses empirical analysis to determine the strike rate of surge arrester towers in plain and mountainous terrains, significantly improving the accuracy and engineering applicability of the strike rate values. It overcomes the limitations of traditional single empirical models with poor adaptability to different terrain conditions. Furthermore, by combining key structural parameters such as the protection angle of the lightning conductor to the side conductor and the tower height, it employs specialized formulas for calculating the strike rate in plains and mountains to accurately calculate the conductor strike rate under corresponding terrain conditions. This fully reflects the significant impact of terrain differences and structural parameters on the strike phenomenon, making the calculation results more consistent with actual operating conditions. This provides more accurate and reliable data support for the lightning protection design and performance evaluation of transmission lines, effectively supporting the formulation and implementation of differentiated and refined lightning protection strategies, thereby improving the lightning resistance level of lines and reducing the risk of lightning strike failures.

[0090] In one implementation, the formula for calculating the conductor snagging rate of the plain transmission line is as follows:

[0091]

[0092] Among them, P α1 h represents the conductor snagging rate of transmission lines in plains areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0093] In one implementation, the formula for calculating the conductor entanglement rate of the mountain transmission line is as follows:

[0094]

[0095] Among them, Pα2 h represents the conductor snagging rate of power transmission lines in mountainous areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0096] In one implementation, step 3 above, based on the number of lightning strikes, the strike rate of the arrester installation tower, and the conductor backflash rate, combined with the lightning backflash current and the backflash current when the arrester operates, uses the arrester operation count calculation formula to calculate the arrester operation count at the arrester installation tower.

[0097] For example, the lightning backflash current and the lightning strike current during arrester operation are obtained by analyzing the operating conditions of the line arrester, specifically including:

[0098] When the lightning current shunted by the surge arrester reaches the operating current, the surge arrester will trip. Lightning strikes can occur in two forms: backflash and lightning strike. When lightning strikes a conductor, the surge arrester's shunting ratio is calculated at 80%, and the shunting amplitude reaches the operating current, causing the surge arrester to trip. When lightning strikes a tower or surge arrester line via backflash, the lightning current amplitude at the time of arrester trip is much larger. Based on the lightning impulse discharge voltage test waveforms of surge arresters at different voltage levels, the lightning backflash current I at the time of arrester trip is obtained. 反 and winding current I 绕 The amplitudes are shown in Table 3.

[0099] Table 3 Lightning current amplitude when surge arrester operates

[0100]

[0101]

[0102] This invention addresses the shortcomings of existing mechanical surge arrester counters, which primarily rely on manual on-site data reading (via telescopes or tower climbing), and the deficiencies of existing limited remote transmission solutions in terms of power supply reliability, communication stability, and transmission distance. These shortcomings result in data real-time performance and accuracy failing to meet the requirements of modern power grids. Figure 2This invention presents an overall flowchart for calculating the number of surge arrester operations on transmission lines. It collects line parameters such as tower structure and terrain, as well as lightning parameters such as ground flash density and cumulative probability distribution of lightning current amplitude. This allows for the calculation of the number of lightning strikes on the towers where the surge arresters are installed and the number of lightning strikes on the line. Based on experimental data from surge arresters of different voltage levels, the operating current of the arresters is obtained. Combining the operating current of surge arresters at different voltage levels with the statistical data of lightning current amplitude probability, the number of surge arrester operations at each tower is estimated based on the number of lightning strikes. The resulting surge arrester operation count reflects the actual lightning variations on the line, making it relatively convenient to estimate the number of surge arrester operations. Traditional surge arrester operation count counters provide single, isolated data, lacking information such as operation time and surrounding lightning activity at the time of operation, making it difficult to reliably measure the reliability and effectiveness of the surge arrester's operation. This invention utilizes information such as lightning strike distribution, tower lightning resistance level, and surge arrester parameters to calculate the number of surge arrester operations on transmission lines. The line's operating and maintenance unit can combine the number of lightning strikes on the towers to conduct status evaluations of the line's surge arresters and summarize methods for assessing surge arrester operation, thereby improving the safe and stable operation level of the line and making the calculation results more consistent with the actual lightning environment changes of the line, making it easier for operating and maintenance personnel to use.

[0103] This method significantly improves the scientific rigor and consistency of surge arrester operation count estimation, addressing the problems of traditional counter data being isolated and unable to reliably measure the reliability and effectiveness of surge arrester operation. It incorporates line lightning activity parameters and surge arrester operation lightning current characteristics. By correlating and modeling these key factors, the number of surge arrester operations is calculated. This calculation method fully considers the lightning activity characteristics of the actual line environment, making the calculation results closer to the actual lightning risk level of the line and the actual operating scenario of the surge arrester, thus significantly improving the scientific rigor and consistency with actual lightning variations. Compared to traditional methods that rely solely on the number of single operations, this method provides a more comprehensive basis for evaluating whether the surge arrester operates normally and its protective effect.

[0104] The comprehensive calculation method proposed in this invention is based on available lightning monitoring data and known surge arrester parameters, and performs calculations through an established theoretical model. This method avoids relying entirely on manual on-site readings or the high-cost, high-complexity, dense deployment of remote monitoring terminals to directly obtain the number of actions of each surge arrester. By utilizing existing or centrally acquired lightning activity information, combined with the basic parameters of the line and surge arresters, the expected number of actions of surge arresters on a specific line or tower can be estimated relatively conveniently, providing power grid operation and maintenance personnel with a simpler and relatively lower-cost estimation tool.

[0105] The model deeply integrates and utilizes lightning activity monitoring data, extending its value to the field of surge arrester condition assessment. This improves the efficiency and depth of utilization of existing lightning monitoring data. Simultaneously, the model's calculation results are themselves processed and analyzed high-value information that can be directly used to support decision-making. Compared to raw, isolated counter readings, they are more intelligent and usable, and easier for the backend system to receive, store, display, and use for further analysis.

[0106] In one implementation, the calculation formula for the number of surge arrester operations is as follows:

[0107] N B =P β N T P(>I 反 )+P α N T P(>I 绕 )

[0108] Where, N B P represents the number of times the surge arrester at the tower where the surge arrester is installed. β The strike rate of surge arresters installed on towers in plain terrain or mountainous terrain for transmission lines, N. T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, P α For the conductor winding failure rate of transmission lines in plains or mountainous areas, I 反 P(>I) is the lightning backflash current when the surge arrester operates. 反 () indicates that the lightning current amplitude is greater than I 反 The probability, I 绕 The surge current when the surge arrester operates, P(>I) 绕 () indicates that the lightning current amplitude is greater than I 绕 The probability of.

[0109] In one implementation, the magnitude of the lightning backflash current and the magnitude of the surge arrester's backflash current are determined based on the voltage level and the series gap value.

[0110] For example, P(>I) 反 ) and P(>I 绕 The cumulative probability distribution formula for lightning current amplitude needs to be used for calculation. Table 4 below shows the cumulative probability distribution formula for lightning current amplitude for a certain 500kV line from 2017 to 2021:

[0111] Table 4

[0112]

[0113] Where P(>I) is the probability that the lightning current amplitude exceeds I(kA), and I is the given lightning current amplitude (kA).

[0114] Example 2:

[0115] Based on the same inventive concept, this patent application also provides a system for calculating the number of operations of a surge arrester on a transmission line, such as... Figure 3 As shown, it includes: a lightning strike count calculation module, a strike rod bypass rate calculation module, and a surge arrester actuation count calculation module;

[0116] The lightning strike count calculation module is used to calculate the number of lightning strikes on the lightning arrester installation tower based on the line characteristic parameters of the transmission line and the lightning parameters of the lightning arrester installation tower on the transmission line.

[0117] The strike-off rate calculation module is used to calculate the strike-off rate of the arrester installation tower and the conductor strike-off rate based on the line characteristic parameters, using empirical analysis and conductor strike-off rate calculation formula, respectively.

[0118] The surge arrester operation count calculation module is used to calculate the surge arrester operation count at the surge arrester installation tower based on the number of lightning strikes, the surge arrester installation tower strike rate, the conductor backflash rate, the lightning backflash current when the surge arrester operates, and the surge arrester backflash current when the surge arrester operates, using the surge arrester operation count calculation formula.

[0119] Preferably, the lightning strike count calculation module is specifically used for:

[0120] The first and second half spans of each surge arrester installation tower on the transmission line are used as the statistical interval for the number of lightning strikes on the surge arrester installation tower.

[0121] Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, the lightning strike count calculation formula is used to calculate the number of lightning strikes per year for each surge arrester installation tower within the lightning strike count statistical interval.

[0122] The line characteristic parameters include at least one or more of the following: basic line information, tower structure, transmission line corridor topography, number of overhead ground wires, protection angle of lightning conductors to side conductors, and height of lightning arrester towers; the lightning parameters include at least one or more of the following: ground flash density and cumulative probability distribution of lightning current amplitude of lightning arrester towers.

[0123] Preferably, the formula for calculating the number of lightning strikes is as follows:

[0124]

[0125] Where, N TThe number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, N. gT The ground flash density of the tower where the surge arrester is installed, h T The height of the tower where the surge arrester is installed, b is the distance between the two overhead ground wires, L1 is the small side span distance, and L2 is the large side span distance.

[0126] Preferably, the conductor inrush rate calculation formula includes: a conductor inrush rate calculation formula for plain transmission lines and a conductor inrush rate calculation formula for mountain transmission lines; the strike rod inrush rate calculation module is specifically used for:

[0127] Based on the topography of the transmission line corridor and the number of overhead ground wires, the empirical analysis method was used to obtain the strike rate of the surge arrester installation towers in plain terrain and the strike rate of the surge arrester installation towers in mountainous terrain where the transmission line is located.

[0128] Based on the protection angle of the lightning protection wire to the side conductor and the height of the lightning arrester tower, the calculation formulas for the conductor strike rate of transmission lines in plains and mountainous areas are adopted to calculate the conductor strike rate of transmission lines in plains and mountainous areas respectively.

[0129] Preferably, the formula for calculating the conductor entanglement rate of the plain transmission line is as follows:

[0130]

[0131] Among them, P α1 h represents the conductor snagging rate of transmission lines in plains areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0132] Preferably, the formula for calculating the conductor entanglement rate of the mountain transmission line is as follows:

[0133]

[0134] Among them, P α2 h represents the conductor snagging rate of power transmission lines in mountainous areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

[0135] Preferably, the calculation formula for the number of surge arrester operations is as follows:

[0136] N B =P β N T P(>I 反 )+P α N T P(>I 绕 )

[0137] Where, N BP represents the number of times the surge arrester at the tower where the surge arrester is installed. β The strike rate of surge arresters installed on towers in plain terrain or mountainous terrain for transmission lines, N. T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, P α For the conductor winding failure rate of transmission lines in plains or mountainous areas, I 反 P(>I) is the lightning backflash current when the surge arrester operates. 反 () indicates that the lightning current amplitude is greater than I 反 The probability, I 绕 The surge current when the surge arrester operates, P(>I) 绕 () indicates that the lightning current amplitude is greater than I 绕 The probability of.

[0138] Preferably, the magnitude of the lightning backflash current and the magnitude of the surge arrester's backflash current are determined based on the voltage level and the series gap value.

[0139] Example 3

[0140] like Figure 4 As shown, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0141] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method for calculating the number of operation of a transmission line surge arrester in the above embodiment.

[0142] Example 4

[0143] Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the method for calculating the number of operations of a transmission line surge arrester in the above embodiments.

[0144] Those skilled in the art will understand that embodiments of this patent application can be provided as methods, systems, or computer program products. Therefore, this patent application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this patent application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0145] This patent application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the patent application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing device, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0146] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0147] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this patent application and not to limit its scope of protection. Although the patent application has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this patent application, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the application, but these changes, modifications or equivalent substitutions are all within the scope of protection of the claims pending approval.

Claims

1. A method for calculating the number of operations of a surge arrester on a transmission line, characterized in that, include: Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, the number of lightning strikes on the surge arrester installation towers is calculated. Based on the line characteristic parameters, the strike rate of the arrester installation tower and the strike rate of the conductor are calculated using empirical analysis and conductor backflash rate calculation formula, respectively. Based on the number of lightning strikes, the strike rate of the arrester installation tower, and the conductor backflash rate, combined with the lightning backflash current and backflash current when the arrester operates, the number of arrester operations at the arrester installation tower is calculated using the arrester operation count formula.

2. The method as described in claim 1, characterized in that, The calculation of the number of lightning strikes on the surge arrester-mounted towers, based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester-mounted towers on the transmission line, includes: The first and second half spans of each surge arrester installation tower on the transmission line are used as the statistical interval for the number of lightning strikes on the surge arrester installation tower. Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, the lightning strike count calculation formula is used to calculate the number of lightning strikes per year for each surge arrester installation tower within the lightning strike count statistical interval. The line characteristic parameters include at least one or more of the following: basic line information, tower structure, transmission line corridor topography, number of overhead ground wires, protection angle of lightning conductors to side conductors, and height of lightning arrester towers; the lightning parameters include at least one or more of the following: ground flash density and cumulative probability distribution of lightning current amplitude of lightning arrester towers.

3. The method as described in claim 2, characterized in that, The formula for calculating the number of lightning strikes is as follows: Where, N T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, N. gT The ground flash density of the tower where the surge arrester is installed, h T The height of the tower where the surge arrester is installed, b is the distance between the two overhead ground wires, L1 is the small side span distance, and L2 is the large side span distance.

4. The method as described in claim 1, characterized in that, The formula for calculating the conductor strike rate includes: a formula for calculating the conductor strike rate of transmission lines in plains areas and a formula for calculating the conductor strike rate of transmission lines in mountainous areas; based on the line characteristic parameters, the calculation of the surge arrester installation tower strike rate and the conductor strike rate using empirical analysis and the conductor strike rate calculation formula includes: Based on the topography of the transmission line corridor and the number of overhead ground wires, the empirical analysis method was used to obtain the strike rate of the surge arrester installation towers in plain terrain and the strike rate of the surge arrester installation towers in mountainous terrain where the transmission line is located. Based on the protection angle of the lightning protection wire to the side conductor and the height of the lightning arrester tower, the calculation formulas for the conductor strike rate of transmission lines in plains and mountainous areas are adopted to calculate the conductor strike rate of transmission lines in plains and mountainous areas respectively.

5. The method as described in claim 4, characterized in that, The formula for calculating the conductor winding failure rate of the plain transmission line is as follows: Among them, P α1 h represents the conductor snagging rate of transmission lines in plains areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

6. The method as described in claim 4, characterized in that, The formula for calculating the conductor winding failure rate of the power transmission line in the mountainous area is as follows: Among them, P α2 h represents the conductor snagging rate of power transmission lines in mountainous areas. T The height of the tower where the surge arrester is installed, and α is the protection angle of the surge arrester against the side conductor.

7. The method as described in claim 1, characterized in that, The formula for calculating the number of times the surge arrester operates is as follows: N B =P β N T P(>I 反 )+P α N T P(>I 绕 ) Where, N B P represents the number of times the surge arrester at the tower where the surge arrester is installed. β The strike rate of surge arresters installed on towers in plain terrain or mountainous terrain for transmission lines, N. T The number of lightning strikes per year within the statistical period for the installation of lightning arresters on the tower, P α For the conductor winding failure rate of transmission lines in plains or mountainous areas, I 反 P(>I) is the lightning backflash current when the surge arrester operates. 反 () indicates that the lightning current amplitude is greater than I 反 The probability, I 绕 The surge current when the surge arrester operates, P(>I) 绕 () indicates that the lightning current amplitude is greater than I 绕 The probability of.

8. The method as described in claim 1, characterized in that, The magnitudes of the lightning backflash current and the surge current during surge arrester operation are determined based on the voltage level and the series gap value.

9. A system for calculating the number of times a surge arrester operates on a transmission line, characterized in that, include: Lightning strike count calculation module, lightning rod backlash rate calculation module, and surge arrester operation count calculation module; The lightning strike count calculation module is used to calculate the number of lightning strikes on the lightning arrester installation tower based on the line characteristic parameters of the transmission line and the lightning parameters of the lightning arrester installation tower on the transmission line. The strike-off rate calculation module is used to calculate the strike-off rate of the arrester installation tower and the strike-off rate of the conductor based on the line characteristic parameters, using empirical analysis and conductor strike-off rate calculation formula, respectively. The surge arrester operation count calculation module is used to calculate the surge arrester operation count at the surge arrester installation tower based on the number of lightning strikes, the surge arrester installation tower strike rate, the conductor backflash rate, the lightning backflash current when the surge arrester operates, and the surge arrester backflash current when the surge arrester operates, using the surge arrester operation count calculation formula.

10. The system as described in claim 9, characterized in that, The lightning strike count calculation module is specifically used for: The first and second half spans of each surge arrester installation tower on the transmission line are used as the statistical interval for the number of lightning strikes on the surge arrester installation tower. Based on the line characteristic parameters of the transmission line and the lightning parameters of the surge arrester installation towers on the transmission line, the lightning strike count calculation formula is used to calculate the number of lightning strikes per year for each surge arrester installation tower within the lightning strike count statistical interval. The line characteristic parameters include at least one or more of the following: basic line information, tower structure, transmission line corridor topography, number of overhead ground wires, protection angle of lightning conductors to side conductors, and height of lightning arrester towers; the lightning parameters include at least one or more of the following: ground flash density and cumulative probability distribution of lightning current amplitude of lightning arrester towers.

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