A transmission line parameter measurement safety reduction stop decision method, system and medium
Patent Information
- Application Number
- CN202610827930.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-09
- Publication Date
- 2026-08-28
AI Technical Summary
然而，该类陪停决策方式主要依赖人工经验和定性判断，缺乏对邻近线路感应影响程度、不同线路叠加作用以及安全限值边界的量化分析，导致陪停范围难以准确确定，容易出现为保证安全而扩大陪停范围或者因低估感应影响而陪停不足的情况，前者会造成不必要的停电损失并影响电网运行可靠性，后者则可能影响测参作业安全
通过采集待测参线路及邻近线路的运行参数和空间参数，量化计算邻近线路对待测参线路产生的静电感应电压和电磁感应电压，并结合安全限值和感应影响贡献迭代确定必要陪停线路，从而生成测参陪停决策结果，有效解决了现有线路测参陪停决策依赖人工经验而难以基于感应电压安全边界准确确定必要陪停范围的问题。
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Figure CN122652115A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power grid operation and maintenance technology, and in particular to a method, system and medium for making decisions on safe reduction of power transmission line parameters. Background Technology
[0002] Transmission line parameter testing is a fundamental task in the construction, renovation, operation, and maintenance of power systems. It is typically used to obtain the power frequency electrical parameters of the lines, providing data support for power flow calculations, relay protection settings, fault analysis, and subsequent operation control. While power outages are generally required for line parameter testing, in actual power grids, transmission lines often run in parallel, cross over each other, are erected on the same tower, or are located close to each other. Even if the line under test is de-energized, nearby lines still in operation may induce electrostatic and electromagnetic voltages on the line under test through electric and magnetic field coupling, causing the line to become induced-charged. This can impact the safety of on-site testing personnel, testing equipment, and the overall operation process.
[0003] In existing technologies, to reduce the safety risks posed by induced voltage, the need for auxiliary shutdown of adjacent energized lines is typically determined based on factors such as line spacing, parallel length, intersection relationships, and the experience of maintenance personnel, in order to reduce induced voltage on the line under test. However, this type of auxiliary shutdown decision-making relies heavily on manual experience and qualitative judgment, lacking quantitative analysis of the degree of induced influence from adjacent lines, the superimposed effects of different lines, and safety limit boundaries. This makes it difficult to accurately determine the auxiliary shutdown range, easily leading to situations where the auxiliary shutdown range is expanded to ensure safety or insufficient shutdown is implemented due to underestimating the induced influence. The former can cause unnecessary power outages and affect the reliability of power grid operation, while the latter may affect the safety of parameter measurement operations. Therefore, existing technologies still face the problem of accurately determining the auxiliary shutdown range for line parameter measurement.
[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention
[0005] This invention provides a method, system, and medium for making safety reduction and shutdown decisions based on transmission line parameter measurement, which can effectively solve the problems in the background art.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for making safety-based power outage decisions based on transmission line parameter measurement, the method comprising: Obtain the operating parameters and spatial parameters of the line under test and its neighboring lines, and determine the target neighboring lines to be evaluated based on the spatial parameters; Based on the operating parameters and the spatial parameters, the coupling parameters between the line under test and each of the target adjacent lines are determined, and the electrostatic induction voltage and electromagnetic induction voltage generated by each of the target adjacent lines are calculated. Based on the electrostatic induction voltage, the electromagnetic induction voltage, and the spatial relationship between each of the target adjacent lines, the total electrostatic induction voltage and the total electromagnetic induction voltage of the parameter line to be tested are determined; The total electrostatic induction voltage and the total electromagnetic induction voltage are compared with their corresponding safety limits, and a decision not to require a shutdown is generated when neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the limit. When the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the limit, a backup line is determined based on the induced influence contribution of each of the target adjacent lines, and the total electrostatic induction voltage and the total electromagnetic induction voltage are updated based on the backup line. Repeatedly determine the accompanying circuit and update the total electrostatic induction voltage and the total electromagnetic induction voltage until the updated total electrostatic induction voltage and the total electromagnetic induction voltage do not exceed the limit, and generate the parameter-based accompanying circuit decision result.
[0007] Furthermore, the operating parameters and spatial parameters of the line under test and adjacent lines are obtained, including: Obtain the voltage level, length, height to ground, conductor type, and ground wire type of the circuit under test; Obtain the voltage level, operating current, length, height to ground, conductor type, and ground wire type of each of the adjacent lines; The horizontal distance, parallel length, and intersection angle between the line to be tested and each of the adjacent lines are obtained, and the horizontal distance, parallel length, and intersection angle are used as the spatial parameters.
[0008] Further, determining the target neighboring lines to be evaluated based on the spatial parameters includes: The adjacent lines that are no more than 100 meters away from the line to be tested and whose intersection angle is no greater than 60° are identified as the target adjacent lines. Neighboring lines whose horizontal distance from the line under test exceeds 100 meters or whose intersection angle is greater than 60° are excluded from the induction influence assessment range.
[0009] Further, determining the coupling parameters between the line under test and each of the target neighboring lines includes: A simplified two-dimensional model of the line is constructed based on the line to be tested, the target adjacent line, and the ground wire. In the simplified two-dimensional model of the line, the geometric relationship between the line under test, the target adjacent line, and the ground wire is characterized by the line's equivalent radius, ground height, and mutual distance. The capacitance and inductance matrices of the line under test, the target adjacent line, and the ground wire are calculated based on the geometric relationship, and the coupling parameters are determined by the capacitance and inductance matrices.
[0010] Further, based on the geometric relationships, the capacitance and inductance matrices of the circuit under test, the target adjacent circuits, and the ground wire are calculated, including: Determine the conductor radius, height above ground, conductor spacing, and mirror distance relative to the ground plane of each conductor in the test line, the target adjacent line, and the ground wire; The capacitive coupling relationship between the conductors is calculated based on the conductor radius, the height above ground, the conductor spacing, and the mirror distance of each conductor, and the capacitance matrix is formed. The inductive coupling relationship between the conductors is calculated based on the conductor radius, the height to ground, the conductor spacing, and the mirror distance of each conductor, and the inductance matrix is formed. The matrix elements in the capacitance matrix corresponding to the ground coupling of the line under test are determined as ground capacitances, and the matrix elements in the capacitance matrix corresponding to the coupling between the line under test and the target adjacent line and the ground wire are determined as mutual capacitances. The matrix elements in the inductance matrix corresponding to the ground coupling of the line under test are determined as self-inductance to ground, and the matrix elements in the inductance matrix corresponding to the coupling between the line under test and the target adjacent line and the ground wire are determined as mutual inductance.
[0011] Further, the electrostatic induction voltage and electromagnetic induction voltage generated by each of the target's adjacent lines are calculated, including: Based on the ground capacitance, the mutual capacitance, and the voltage level of the target adjacent line, calculate the electrostatic induced voltage generated on the parameter line under test by each of the target adjacent lines; Based on the ground inductance, the mutual inductance, the operating current of the target adjacent line, and the parallel length, calculate the electromagnetic induced voltage generated by each of the target adjacent lines on the line under test. Based on the magnitude of the electrostatic induction voltage and the electromagnetic induction voltage corresponding to each of the target's adjacent lines, the target's adjacent lines are numbered and sorted, and the numbering and sorting are used as the basis for determining the contribution of the induced influence.
[0012] Further, determining the total electrostatic induction voltage and total electromagnetic induction voltage of the circuit under test includes: Determine the distance between any two adjacent target lines, and determine the length of the line to be measured. When the distance between adjacent lines exceeds 0.1 times the length of the line, the induced voltages corresponding to the two target adjacent lines are directly added together; When the distance between adjacent lines does not exceed 0.1 times the length of the line, the induced voltages corresponding to the two target adjacent lines are calculated and added together according to the proportional relationship between the distance between adjacent lines and the length of the line. The electrostatic induced voltage and the electromagnetic induced voltage are respectively subjected to the direct addition or the addition after conversion to obtain the total electrostatic induced voltage and the total electromagnetic induced voltage.
[0013] Further, when the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the limit, a parameter-based shutdown decision result is generated, including: Set the safety limits corresponding to the electrostatic induction voltage and the electromagnetic induction voltage, or adjust the safety limits according to the requirements of the measurement operation; When the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the corresponding safety limit, the line with the greatest contribution to the induced impact is selected from each of the target's neighboring lines according to the numbering order as the accompanying line. Add the accompanying stop line to the accompanying stop set, and set the electrostatic induction voltage and the electromagnetic induction voltage generated by the accompanying stop line to 0; Based on the electrostatic induction voltage and the electromagnetic induction voltage after they were set to 0, the total electrostatic induction voltage and the total electromagnetic induction voltage are redefined; If the re-determined total electrostatic induction voltage and / or total electromagnetic induction voltage still exceed the corresponding safety limit, the line with the greatest contribution to the induced influence from the remaining target neighboring lines shall be added to the accompanying stop set until the total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the corresponding safety limit.
[0014] A power transmission line parameter measurement and safety shutdown decision-making system, the system comprising: The parameter filtering module obtains the operating parameters and spatial parameters of the line to be tested and its neighboring lines, and determines the target neighboring lines to be evaluated based on the spatial parameters. The induced voltage calculation module determines the coupling parameters between the line under test and each target's neighboring lines based on operating parameters and spatial parameters, and calculates the electrostatic induced voltage and electromagnetic induced voltage generated by each target's neighboring lines. The total induced voltage determination module determines the total electrostatic induced voltage and total electromagnetic induced voltage of the line under test based on the electrostatic induced voltage, electromagnetic induced voltage, and the spatial relationship between the lines adjacent to each target. The limit comparison module compares the total electrostatic induction voltage and the total electromagnetic induction voltage with the corresponding safety limits respectively, and generates a decision that does not require a shutdown when neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the limit. The backup shutdown update module determines the backup shutdown line based on the induced influence contribution of each target's adjacent line when the total electrostatic induction voltage and / or total electromagnetic induction voltage exceed the limit, and updates the total electrostatic induction voltage and total electromagnetic induction voltage based on the backup shutdown line. The decision generation module repeatedly determines the accompanying shutdown line and updates the total electrostatic induction voltage and total electromagnetic induction voltage until the updated total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the limits, and generates the parameter-based accompanying shutdown decision result.
[0015] A computer-readable storage medium storing a computer program, the computer program including program instructions that, when executed by a processor, can implement the transmission line parameter measurement safety reduction and shutdown decision method.
[0016] The technical solution of this invention can achieve the following technical effects: By collecting the operating and spatial parameters of the line under test and adjacent lines, the electrostatic and electromagnetic induction voltages generated by adjacent lines on the line under test are quantitatively calculated. The necessary accompanying lines are determined iteratively by combining safety limits and the contribution of induced influence, thereby generating the accompanying shutdown decision results. This effectively solves the problem that the existing line accompanying shutdown decision relies on human experience and is difficult to accurately determine the necessary accompanying shutdown range based on the safety boundary of induced voltage.
[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A flowchart illustrating a safety reduction and shutdown decision-making method for power transmission line parameter measurement; Figure 2 This is a schematic diagram of the spatial structure of the line under test and its surrounding adjacent lines. Figure 3 A schematic diagram showing the calculation results of the induced voltage of the line under test for each adjacent line; Figure 4 This is a schematic diagram illustrating the decision-making results for power outages on nearby power lines. Detailed Implementation
[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0022] Example 1; like Figure 1 As shown, this application provides a method for making safety reduction and shutdown decisions based on transmission line parameter measurement, the method including: Obtain the operating parameters and spatial parameters of the line under test and its neighboring lines, and determine the target neighboring lines to be evaluated based on the spatial parameters; Based on the operating parameters and spatial parameters, the coupling parameters between the line under test and each target neighboring line are determined, and the electrostatic induction voltage and electromagnetic induction voltage generated by each target neighboring line are calculated. Based on the electrostatic induction voltage, electromagnetic induction voltage, and the spatial relationship between adjacent lines of each target, determine the total electrostatic induction voltage and total electromagnetic induction voltage of the line to be measured. The total electrostatic induction voltage and the total electromagnetic induction voltage are compared with their corresponding safety limits, and a decision not to require shutdown is generated when neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the limit. When the total electrostatic induction voltage and / or total electromagnetic induction voltage exceed the limit, the accompanying line is determined based on the induced influence contribution of each target's adjacent line, and the total electrostatic induction voltage and total electromagnetic induction voltage are updated based on the accompanying line. Repeatedly determine the accompanying shutdown line and update the total electrostatic induction voltage and total electromagnetic induction voltage until the updated total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the limit, and generate the parameter-based accompanying shutdown decision result.
[0023] Specifically, in one implementation, data is first collected from the line to be tested and its surrounding adjacent lines to obtain the operating parameters and spatial parameters of the line to be tested and its adjacent lines. Based on the spatial parameters, it is determined whether each adjacent line will have a induced impact on the line to be tested, thereby determining the target adjacent lines to participate in the subsequent evaluation. After determining the target's neighboring lines, based on the operating parameters and spatial parameters, the electrical coupling relationship between the line under test and each target's neighboring lines is established. The coupling parameters between the line under test and each target's neighboring lines are obtained from the electrical coupling relationship. Then, the electrostatic induction voltage and electromagnetic induction voltage generated by each target's neighboring lines on the line under test are calculated respectively. After obtaining the electrostatic induction voltage and electromagnetic induction voltage corresponding to each target's adjacent line, the electrostatic induction voltage and electromagnetic induction voltage are superimposed or corrected according to the spatial relationship between each target's adjacent line to obtain the total electrostatic induction voltage and total electromagnetic induction voltage corresponding to the line under test. Subsequently, the total electrostatic induction voltage and the total electromagnetic induction voltage are compared with their corresponding safety limits. When neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the corresponding safety limit, it indicates that the line under test meets the safety requirements for parameter measurement under the current operating state of the adjacent line, and therefore a decision not to require a stop is generated. When the total electrostatic induction voltage and / or total electromagnetic induction voltage exceed the corresponding safety limit, the target neighboring line with the greater contribution of the induced influence on the line under test is determined as the accompanying line based on the magnitude of the induced influence of each target neighboring line. After determining the accompanying line, the total electrostatic induction voltage and total electromagnetic induction voltage of the line under test are recalculated. If the recalculated total electrostatic induction voltage and / or total electromagnetic induction voltage still exceed the corresponding safety limit, then new accompanying lines are determined from the remaining target adjacent lines, and the total electrostatic induction voltage and total electromagnetic induction voltage are updated again until the updated total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the corresponding safety limit, and finally the parameter-based accompanying stop decision result is generated.
[0024] The technical solution of this invention collects the operating parameters and spatial parameters of the line under test and adjacent lines, quantifies and calculates the electrostatic induction voltage and electromagnetic induction voltage generated by adjacent lines on the line under test, and iteratively determines the necessary accompanying line by combining safety limits and the contribution of induced influence, thereby generating the accompanying line shutdown decision result. This effectively solves the problem that the existing line accompanying line shutdown decision relies on human experience and is difficult to accurately determine the necessary accompanying line shutdown range based on the safety boundary of induced voltage.
[0025] Furthermore, obtaining the operating and spatial parameters of the line under test and adjacent lines includes: Obtain the voltage level, length, height above ground, conductor type, and ground wire type of the circuit under test; Obtain the voltage level, operating current, length, height above ground, conductor type, and ground wire type of each adjacent line; Obtain the horizontal distance, parallel length, and intersection angle between the line to be tested and each adjacent line, and use the horizontal distance, parallel length, and intersection angle as spatial parameters.
[0026] As a preferred embodiment of the above, the operating parameters and spatial parameters of the line under test and adjacent lines are obtained. The operating parameters include the voltage level, length, height to ground, and conductor type of the line under test, as well as the voltage level, operating current, length, height to ground, and conductor type of adjacent lines. The spatial parameters include the distance, parallel length, and intersection angle between the line under test and each adjacent line. In specific applications, the ground wire type, three-phase conductor height to ground, line rated voltage, and line operating current of the line under test and adjacent lines can also be obtained, and the operating parameters and spatial parameters are used as the basis for subsequent determination of target adjacent lines and calculation of induced voltage.
[0027] Furthermore, based on spatial parameters, the target adjacent lines participating in the evaluation are determined, including: The adjacent lines that are no more than 100 meters away from the line to be measured and whose intersection angle is no more than 60° are identified as the target adjacent lines; Neighboring lines that are more than 100 meters away from the line under test or whose intersection angle is greater than 60° are excluded from the scope of the induction effect assessment.
[0028] As a preferred embodiment of the above, the target neighboring line participating in the evaluation is determined based on the horizontal distance and intersection angle in the spatial parameters. Specifically, when the horizontal distance between the neighboring line and the line to be tested exceeds 100 meters, or the intersection angle between the neighboring line and the line to be tested is greater than 60 degrees, it is determined that the induced influence of the neighboring line on the line to be tested is not considered and is excluded from the evaluation scope. When the horizontal distance between the neighboring line and the line to be tested does not exceed 100 meters, and the intersection angle between the neighboring line and the line to be tested is not greater than 60 degrees, the neighboring line is determined as the target neighboring line participating in the induced influence evaluation.
[0029] Furthermore, determining the coupling parameters between the line under test and each target's neighboring lines includes: A simplified two-dimensional model of the line is constructed based on the line to be tested, the target adjacent lines, and the ground wire. In the two-dimensional simplified model of the line, the geometric relationship between the line under test, the target adjacent line and the ground wire is characterized by the line's equivalent radius, ground height and mutual distance. The capacitance and inductance matrices of the circuit under test, the adjacent circuits, and the ground wire are calculated based on geometric relationships, and the coupling parameters are determined by the capacitance and inductance matrices.
[0030] Furthermore, based on geometric relationships, the capacitance and inductance matrices of the circuit under test, adjacent circuits, and ground are calculated, including: Determine the conductor radius, height above ground, conductor spacing, and mirror distance relative to the ground plane of each conductor in the test line, the target adjacent line, and the ground wire; Based on the conductor radius, height above ground, conductor spacing, and mirror distance of each conductor, the capacitive coupling relationship between each conductor is calculated, and a capacitance matrix is formed. Based on the conductor radius, height above ground, conductor spacing, and mirror distance of each conductor, the inductive coupling relationship between each conductor is calculated, and an inductance matrix is formed. The matrix elements in the capacitance matrix corresponding to the ground coupling of the line under test are defined as ground capacitances, and the matrix elements in the capacitance matrix corresponding to the coupling between the line under test and the target adjacent line and ground wire are defined as mutual capacitances. The matrix elements in the inductance matrix corresponding to the coupling between the line under test and ground are defined as self-inductance to ground, and the matrix elements in the inductance matrix corresponding to the coupling between the line under test and the target adjacent line and ground wire are defined as mutual inductance.
[0031] Furthermore, the calculation of electrostatic induction voltage and electromagnetic induction voltage generated by the lines adjacent to each target includes: Based on the capacitance to ground, mutual capacitance, and voltage levels of the target's neighboring lines, calculate the electrostatic induced voltage generated on the test line by each target's neighboring lines. Based on the ground inductance, mutual inductance, operating current of the target's adjacent lines, and parallel length, calculate the electromagnetic induced voltage generated on the test parameter line by each target's adjacent lines. Based on the magnitude of the electrostatic induction voltage and electromagnetic induction voltage corresponding to each target's adjacent lines, the adjacent lines are numbered and sorted, and the numbering and sorting are used as the basis for determining the contribution of induced influence.
[0032] As a preferred embodiment of the above embodiments, in one specific embodiment, the formula for calculating the capacitance and inductance matrix is: ; ; in, Let n be an inductance matrix consisting of n conductors. It is a capacitance matrix consisting of n conductors; Permeability of free space; The dielectric constant of the medium; Let be the self-geometric coefficient of conductor i; D is the cross-geometric coefficient between conductor i and conductor j; ij Let D be the distance from conductor i to conductor j as a mirror image of the ground plane; ii Let d be the distance from conductor i to its mirror image; R be the radius of the conductor; d ij Let C be the distance from conductor i to conductor j; where the matrix element C... 11 The first element represents the capacitance to ground of the line to be evaluated, and the remainder represents the mutual capacitance between the line to be evaluated and the operating line and ground wire; matrix element L 11 The value is the self-inductance of the line to be evaluated to ground, and the remainder is the mutual inductance between the line to be evaluated and the operating line and ground wire.
[0033] Furthermore, the determination of the spatial relationship between the lines is based on the distance between adjacent lines of the line under test. If the distance between two lines exceeds 0.1 times the length of the line under test, the induced voltage between the lines is considered to have no effect, and the induced voltages are directly added together. If the distance is less than 0.1 times, the induced voltages of the two lines are then calculated proportionally, and the correction formula is as follows: ; in, The distance between adjacent lines of the measured parameter line; The length of the line to be tested; and These are the induced voltages of the two lines, respectively. ; Information on the structure and operating parameters of the transmission line to be evaluated and its surrounding adjacent lines was collected, including the conductor type, ground wire type, length, height of the three-phase conductors above ground, distance between the line to be evaluated and adjacent lines, parallel length, spatial angle, and rated voltage and operating current of the operating lines. There are three 220kV lines surrounding the line to be evaluated, with parallel lengths of 10km, 20km, and 5km respectively. Line A is 3km away from line B, and line B is 45km away from line C. The line relationships are shown in the attached figure. Figure 2 As shown; Based on the spatial structure relationships of the collected routes, a simplified two-dimensional model is constructed, as shown in the attached figure. Figure 3 As shown; the geometric relationships between lines are described using parameters such as equivalent line radius, height above ground, and mutual distance, and the capacitance and inductance matrices covering all transmission lines and ground wires are calculated based on a simplified model: ; ; Based on the above parameters, the electrostatic induction voltage and electromagnetic induction voltage generated by each adjacent line on the line under test are calculated as follows: Line A: ; ; Line B: ; ; Line C: ; ; in, The capacitance to ground of the circuit under test; The mutual capacitance between the circuit under test and the 2nd to nth charged conductors; The operating voltage of the 2nd to nth charged conductors; The mutual inductance between the circuit under test and the 2nd to nth charged conductors; The current flowing through the 2nd to nth charged conductors; The imaginary unit; The angular frequency is the power frequency. The lines are numbered and sorted from largest to smallest according to the magnitude of the electrostatic induction voltage and electromagnetic induction voltage, so line B is 1, line A is 2, and line C is 3.
[0034] Furthermore, determining the total electrostatic induction voltage and total electromagnetic induction voltage of the circuit under test includes: Determine the distance between any two adjacent target lines, and determine the length of the line to be measured. When the distance between adjacent lines exceeds 0.1 times the line length, the induced voltages corresponding to the two target adjacent lines are directly added together; When the distance between adjacent lines does not exceed 0.1 times the line length, the induced voltages corresponding to the two target adjacent lines are calculated and added together based on the proportional relationship between the distance between adjacent lines and the line length. The electrostatic induced voltage and the electromagnetic induced voltage are directly added or converted and then added to obtain the total electrostatic induced voltage and the total electromagnetic induced voltage.
[0035] As a preferred embodiment of the above embodiments, based on the results obtained from the aforementioned embodiments, line B is 1, line A is 2, and line C is 3. According to the spatial relationship between adjacent lines, the distance between line 1 and line 2 is 3km, which is less than 0.1 times (i.e. 10km) of the line to be tested, so it needs to be converted proportionally. However, the distance between line 1 and line 3, and between line 2 and line 3 is greater than 10km, so the voltage only needs to be linearly superimposed. ; Using the above formula, the electrostatic induced voltage is obtained. ; Electromagnetic induced voltage .
[0036] Furthermore, when the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the limit, a parameter-based shutdown decision is generated, including: Set safety limits for electrostatic induction voltage and electromagnetic induction voltage, or adjust the safety limits according to the requirements of the measurement operation; When the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the corresponding safety limit, the line with the greatest contribution to the induced impact is selected from the adjacent lines of each target according to the numbering order as the accompanying line to be stopped. Add the accompanying circuit to the accompanying circuit set, and set the electrostatic induction voltage and electromagnetic induction voltage generated by the accompanying circuit to 0. Based on the electrostatic induction voltage and electromagnetic induction voltage after they were set to 0, the total electrostatic induction voltage and total electromagnetic induction voltage are redefined. If the recalculated total electrostatic induction voltage and / or total electromagnetic induction voltage still exceed the corresponding safety limit, the line with the greatest contribution to the induced influence from the remaining target-adjacent lines will be added to the accompanying shutdown set until the total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the corresponding safety limit.
[0037] As a preferred embodiment of the above embodiments, based on the results obtained from the aforementioned embodiments, the safety limit for electrostatic induction voltage is set to 5000V and the safety limit for electromagnetic induction voltage is set to 2000V. According to the calculation, both the electrostatic induction voltage and the electromagnetic induction voltage exceed the safety limits, so it is necessary to measure and stop the adjacent lines. Based on the line numbering, the nearest line with the greatest impact from either electrostatic induction voltage or electromagnetic induction voltage is selected for shutdown, i.e., line 1 is shut down. Therefore, the electrostatic induction voltage and electromagnetic induction voltage at this time are as follows: ; ; Both voltages meet safety limits; the decision to cut off power to adjacent lines is as follows: Figure 4 As shown.
[0038] Example 2; Based on the same inventive concept as the transmission line parameter measurement safety reduction and shutdown decision-making method in the foregoing embodiments, the present invention also provides a transmission line parameter measurement safety reduction and shutdown decision-making system, the system comprising: The parameter filtering module obtains the operating parameters and spatial parameters of the line to be tested and its neighboring lines, and determines the target neighboring lines to be evaluated based on the spatial parameters. The induced voltage calculation module determines the coupling parameters between the line under test and each target's neighboring lines based on operating parameters and spatial parameters, and calculates the electrostatic induced voltage and electromagnetic induced voltage generated by each target's neighboring lines. The total induced voltage determination module determines the total electrostatic induced voltage and total electromagnetic induced voltage of the line under test based on the electrostatic induced voltage, electromagnetic induced voltage, and the spatial relationship between the lines adjacent to each target. The limit comparison module compares the total electrostatic induction voltage and the total electromagnetic induction voltage with the corresponding safety limits respectively, and generates a decision that does not require a shutdown when neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the limit. The backup shutdown update module determines the backup shutdown line based on the induced influence contribution of each target's adjacent line when the total electrostatic induction voltage and / or total electromagnetic induction voltage exceed the limit, and updates the total electrostatic induction voltage and total electromagnetic induction voltage based on the backup shutdown line. The decision generation module repeatedly determines the accompanying shutdown line and updates the total electrostatic induction voltage and total electromagnetic induction voltage until the updated total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the limits, and generates the parameter-based accompanying shutdown decision result.
[0039] The system described above in this invention can effectively implement a method for making safety reduction and shutdown decisions for power transmission line parameter measurement. The technical effects it can achieve are as described in the above embodiments, and will not be repeated here.
[0040] Example 3; Based on the same inventive concept as the transmission line parameter measurement safety reduction and shutdown decision method in the foregoing embodiments, the present invention also provides a computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a processor, can realize the transmission line parameter measurement safety reduction and shutdown decision method.
[0041] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.
Claims
1. A method for making safety-based power transmission line shutdown decisions based on parameter measurement, characterized in that, The method includes: Obtain the operating parameters and spatial parameters of the line under test and its neighboring lines, and determine the target neighboring lines to be evaluated based on the spatial parameters; Based on the operating parameters and the spatial parameters, the coupling parameters between the line under test and each of the target adjacent lines are determined, and the electrostatic induction voltage and electromagnetic induction voltage generated by each of the target adjacent lines are calculated. Based on the electrostatic induction voltage, the electromagnetic induction voltage, and the spatial relationship between each of the target adjacent lines, the total electrostatic induction voltage and the total electromagnetic induction voltage of the parameter line to be tested are determined; The total electrostatic induction voltage and the total electromagnetic induction voltage are compared with their corresponding safety limits, and a decision not to require a shutdown is generated when neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the limit. When the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the limit, a backup line is determined based on the induced influence contribution of each of the target adjacent lines, and the total electrostatic induction voltage and the total electromagnetic induction voltage are updated based on the backup line. Repeatedly determine the accompanying circuit and update the total electrostatic induction voltage and the total electromagnetic induction voltage until the updated total electrostatic induction voltage and the total electromagnetic induction voltage do not exceed the limit, and generate the parameter-based accompanying circuit decision result.
2. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 1, characterized in that, Obtain the operating parameters and spatial parameters of the line under test and adjacent lines, including: Obtain the voltage level, length, height to ground, conductor type, and ground wire type of the circuit under test; Obtain the voltage level, operating current, length, height to ground, conductor type, and ground wire type of each of the adjacent lines; The horizontal distance, parallel length, and intersection angle between the line to be tested and each of the adjacent lines are obtained, and the horizontal distance, parallel length, and intersection angle are used as the spatial parameters.
3. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 2, characterized in that, The target neighboring lines to be evaluated are determined based on the spatial parameters, including: The adjacent lines that are no more than 100 meters away from the line to be tested and whose intersection angle is no greater than 60° are identified as the target adjacent lines. Neighboring lines whose horizontal distance from the line under test exceeds 100 meters or whose intersection angle is greater than 60° are excluded from the induction influence assessment range.
4. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 1, characterized in that, Determining the coupling parameters between the line under test and each of the target neighboring lines includes: A simplified two-dimensional model of the line is constructed based on the line to be tested, the target adjacent line, and the ground wire. In the simplified two-dimensional model of the line, the geometric relationship between the line under test, the target adjacent line, and the ground wire is characterized by the line's equivalent radius, ground height, and mutual distance. The capacitance and inductance matrices of the line under test, the target adjacent line, and the ground wire are calculated based on the geometric relationship, and the coupling parameters are determined by the capacitance and inductance matrices.
5. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 4, characterized in that, The capacitance and inductance matrices of the circuit under test, the target adjacent circuit, and the ground wire are calculated based on the geometric relationships, including: Determine the conductor radius, height above ground, conductor spacing, and mirror distance relative to the ground plane of each conductor in the test line, the target adjacent line, and the ground wire; The capacitive coupling relationship between the conductors is calculated based on the conductor radius, the height above ground, the conductor spacing, and the mirror distance of each conductor, and the capacitance matrix is formed. The inductive coupling relationship between the conductors is calculated based on the conductor radius, the height to ground, the conductor spacing, and the mirror distance of each conductor, and the inductance matrix is formed. The matrix elements in the capacitance matrix corresponding to the ground coupling of the line under test are determined as ground capacitances, and the matrix elements in the capacitance matrix corresponding to the coupling between the line under test and the target adjacent line and the ground wire are determined as mutual capacitances. The matrix elements in the inductance matrix corresponding to the ground coupling of the line under test are determined as self-inductance to ground, and the matrix elements in the inductance matrix corresponding to the coupling between the line under test and the target adjacent line and the ground wire are determined as mutual inductance.
6. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 5, characterized in that, Calculate the electrostatic induction voltage and electromagnetic induction voltage generated by each of the target's adjacent lines, including: Based on the ground capacitance, the mutual capacitance, and the voltage level of the target adjacent line, calculate the electrostatic induced voltage generated on the parameter line under test by each of the target adjacent lines; Based on the ground inductance, the mutual inductance, the operating current of the target adjacent line, and the parallel length, calculate the electromagnetic induced voltage generated by each of the target adjacent lines on the line under test. Based on the magnitude of the electrostatic induction voltage and the electromagnetic induction voltage corresponding to each of the target's adjacent lines, the target's adjacent lines are numbered and sorted, and the numbering and sorting are used as the basis for determining the contribution of the induced influence.
7. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 1, characterized in that, Determining the total electrostatic induction voltage and total electromagnetic induction voltage of the circuit under test includes: Determine the distance between any two adjacent target lines, and determine the length of the line to be measured. When the distance between adjacent lines exceeds 0.1 times the length of the line, the induced voltages corresponding to the two target adjacent lines are directly added together; When the distance between adjacent lines does not exceed 0.1 times the length of the line, the induced voltages corresponding to the two target adjacent lines are calculated and added together according to the proportional relationship between the distance between adjacent lines and the length of the line. The electrostatic induced voltage and the electromagnetic induced voltage are respectively subjected to the direct addition or the addition after conversion to obtain the total electrostatic induced voltage and the total electromagnetic induced voltage.
8. The transmission line parameter measurement safety reduction and shutdown decision-making method according to claim 6, characterized in that, When the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the limit, a parameter-based shutdown decision result is generated, including: Set the safety limits corresponding to the electrostatic induction voltage and the electromagnetic induction voltage, or adjust the safety limits according to the requirements of the measurement operation; When the total electrostatic induction voltage and / or the total electromagnetic induction voltage exceed the corresponding safety limit, the line with the greatest contribution to the induced impact is selected from each of the target's neighboring lines according to the numbering order as the accompanying line. Add the accompanying stop line to the accompanying stop set, and set the electrostatic induction voltage and the electromagnetic induction voltage generated by the accompanying stop line to 0; Based on the electrostatic induction voltage and the electromagnetic induction voltage after they were set to 0, the total electrostatic induction voltage and the total electromagnetic induction voltage are redefined; If the re-determined total electrostatic induction voltage and / or total electromagnetic induction voltage still exceed the corresponding safety limit, the line with the greatest contribution to the induced influence from the remaining target neighboring lines shall be added to the accompanying stop set until the total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the corresponding safety limit.
9. A power transmission line parameter measurement and safety shutdown decision-making system, characterized in that, The system includes: The parameter filtering module obtains the operating parameters and spatial parameters of the line to be tested and its neighboring lines, and determines the target neighboring lines to be evaluated based on the spatial parameters. The induced voltage calculation module determines the coupling parameters between the line under test and each target's neighboring lines based on operating parameters and spatial parameters, and calculates the electrostatic induced voltage and electromagnetic induced voltage generated by each target's neighboring lines. The total induced voltage determination module determines the total electrostatic induced voltage and total electromagnetic induced voltage of the line under test based on the electrostatic induced voltage, electromagnetic induced voltage, and the spatial relationship between the lines adjacent to each target. The limit comparison module compares the total electrostatic induction voltage and the total electromagnetic induction voltage with the corresponding safety limits respectively, and generates a decision that does not require a shutdown when neither the total electrostatic induction voltage nor the total electromagnetic induction voltage exceeds the limit. The backup shutdown update module determines the backup shutdown line based on the induced influence contribution of each target's adjacent line when the total electrostatic induction voltage and / or total electromagnetic induction voltage exceed the limit, and updates the total electrostatic induction voltage and total electromagnetic induction voltage based on the backup shutdown line. The decision generation module repeatedly determines the accompanying shutdown line and updates the total electrostatic induction voltage and total electromagnetic induction voltage until the updated total electrostatic induction voltage and total electromagnetic induction voltage do not exceed the limits, and generates the parameter-based accompanying shutdown decision result.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which includes program instructions that, when executed by a processor, can implement the transmission line parameter measurement safety reduction and shutdown decision method as described in any one of claims 1-8.