CN112383015A - Method for determining installation position of electric field monitoring alarm in ultra-high voltage transmission line - Google Patents
Method for determining installation position of electric field monitoring alarm in ultra-high voltage transmission line Download PDFInfo
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- CN112383015A CN112383015A CN202011171706.6A CN202011171706A CN112383015A CN 112383015 A CN112383015 A CN 112383015A CN 202011171706 A CN202011171706 A CN 202011171706A CN 112383015 A CN112383015 A CN 112383015A
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- transmission line
- electric field
- human body
- monitoring alarm
- power transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/20—Spatial arrangements or dispositions of lines or cables on poles, posts or towers
Abstract
The invention discloses a method for determining the installation position of an electric field monitoring alarm in an ultra-high voltage transmission line, which comprises the steps of establishing a simulation model of a human body below the transmission line in an ANSYS Maxwell according to the obtained basic electric parameters of the transmission line and the basic parameters of a human body model, calculating a distorted electric field around the human body, analyzing the influence of different parts of the human body on electric field enhancement factors, and verifying the effectiveness of the simulation model through field experiments. Finally, a reliable and safe installation scheme is provided by summarizing various advantages and disadvantages of different installation positions of the electric field monitoring alarm, and a theoretical basis is provided for safety research of power transmission line maintenance operators according to research results.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility simulation calculation, in particular to a method for determining the installation position of an electric field monitoring alarm in an ultrahigh voltage transmission line.
Background
With the continuous improvement of the voltage grade of a power grid and the continuous expansion of the coverage area, a large number of parallel and cross spans exist in an extra-high voltage line, and the condition of double and multiple loops of the same tower causes that some power failure operation personnel mistakenly climb the tower or mistakenly enter a cross arm on a live side due to negligence during working. If the situation is not found in time, the power grid accident is inevitably caused, even the human body is injured or killed seriously, and immeasurable property loss is brought.
According to research, the change of a surrounding electric field can be caused by actions of walking, turning, arm shaking and the like in the process that a human body approaches a high-voltage wire, so that the measuring accuracy of the electric field sensor is influenced. Therefore, in order to ensure the safety of the operators and the running accuracy of the equipment, it is necessary to research a method for determining the installation position of the electric field monitoring alarm.
Object of the Invention
The invention aims to overcome the defects of the prior art and provides a method for determining the installation position of an electric field monitoring alarm in an extra-high-voltage transmission line.
Disclosure of Invention
The invention provides a method for determining the installation position of an electric field monitoring alarm in an ultra-high voltage transmission line, which comprises the following steps:
step 1, obtaining basic parameters of a power transmission line and basic parameters of a human body model, wherein the basic parameters of the power transmission line comprise operation parameters of the power transmission line, the radius, the height, the phase sequence distribution and the suspension height of a lead; the basic parameters of the human body model comprise the human body size according to the national standard GB 10000-88 Chinese adult human body size; the human body model is used for simulating an operator near the power transmission line;
step 2, setting basic parameters of the power transmission line and basic parameters of the human body model according to the basic parameters of the power transmission line and the human body model obtained in the step 1 by using an ANSYS Maxwell, and establishing an ANSYS Maxwell simulation model;
step 3, respectively calculating electric field enhancement factors of distorted electric fields caused by the top of the head, shoulders, chest and feet when the human body model is below the power transmission line according to the ANSYS Maxwell simulation model established in the step 2; and determining the installation position of the electric field monitoring alarm according to the calculated electric field enhancement factor and by combining the action influence of the working personnel during working.
Preferably, the basic parameters of the mannequin in step 1 include height, leg length, body length, arm length, head height including neck height.
Preferably, the operation parameter of the power transmission line in step 1 includes an operation voltage.
Preferably, the step 3 further comprises obtaining a part of the human body having the smallest influence on the original electric field by analyzing the electric field enhancement factors of different parts, and installing an electric field monitoring alarm at the part.
Drawings
FIG. 1 is a flow chart of the present invention for determining the installation location of an electric field monitoring alarm.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.
FIG. 1 shows a flow chart of determining the installation position of an electric field monitoring alarm in an ultra-high voltage transmission line according to the invention, which comprises the following steps:
step 1, obtaining basic parameters of electrical and human body models
1) Acquiring related power transmission line data including the power transmission line model, the radius, the phase sequence and the suspension height;
2) obtaining a human body model comprising height, leg length, body length, arm length and head height (including neck);
3) operating line operating parameters are obtained, including operating line voltage levels.
Step 2, using ANSYS Maxwell to construct simulation model
And selecting a three-dimensional transient electric field solver in ANSYS Maxwell software, building a calculation model according to the acquired parameters of the power transmission line and the human body model, and setting corresponding voltage excitation and boundary conditions. When the electric field enhancement factor around the human body model is calculated, the established line model can be equivalent to a straight line section of a cylindrical conductor, and an actual line is simulated by defining the diameter, the conductivity and the relative dielectric constant parameter of the conductor; the established human body model can be equivalent to the combination of a corresponding cylinder, a cuboid and a sphere, and the real human body structure is simulated by defining the size, the conductivity and the relative dielectric constant parameters of the model.
Step 3, calculating electric field enhancement factors corresponding to different parts of human body
Calculating electric fields around the top, shoulders, chest and feet of the human body according to the model simulation established in the step 2, and in order to evaluate the influence of the human body on the electric fields, the electric field intensity E after the influence of the human body can be usedSThe value E of the electric field which is uniform with the original space0The ratio is used for evaluating the influence degree of the human body on the electric field, and the influence degree is called as an electric field strength influence factor delta, and the calculation formula is as follows:
in order to reasonably analyze the delta values of each group corresponding to different parts, a coefficient of variation c is introducedvComparing the degree of dispersion of the different sets of data, cvThe smaller the value, the more relevant the measured field strength is to the original field strength.
The coefficient of variation c at the head and shoulders of the manikin can be obtained from the calculation resultvThe minimum value, combine the action influence factor when the operation personnel work, finally confirm to install electric field monitoring alarm at the head, mainly have following several advantages:
1) the electric field monitoring alarm is arranged on the head part, does not obstruct the action of an operator, and is minimally influenced by the actions of the operator such as walking, climbing a pole and the like.
2) The head part has the largest correlation between the strength of the electric field to be measured and the original electric field strength, and the measurement result can reflect the electric field before distortion.
The method has the advantages that factors such as different parts of a human body, actions during working and the like are comprehensively considered, a model of the human body below the power transmission line is established, electric field enhancement factors of the different parts of the human body can be more accurately calculated, and a method for determining the installation position of the electric field monitoring alarm is provided, so that a preventive measure for an operator to mistakenly climb a live tower or a live side cross arm of the tower is taken, and the safety of the operator and a power grid is guaranteed.
It should be emphasized that the above description of the present invention is intended to be illustrative, and not restrictive, and thus the present invention includes embodiments that are not limited to the examples described in the detailed description, and that other embodiments derived from the teachings of the present invention by those skilled in the art are also within the scope of the present invention.
Claims (4)
1. A method for determining the installation position of an electric field monitoring alarm in an ultra-high voltage transmission line is characterized by comprising the following steps:
step 1, obtaining basic parameters of a power transmission line and basic parameters of a human body model, wherein the basic parameters of the power transmission line comprise operation parameters of the power transmission line, the radius, the height, the phase sequence distribution and the suspension height of a lead; the basic parameters of the human body model comprise the human body size according to the national standard GB 10000-88 Chinese adult human body size; the human body model is used for simulating an operator near the power transmission line;
step 2, setting basic parameters of the power transmission line and basic parameters of the human body model according to the basic parameters of the power transmission line and the human body model obtained in the step 1 by using an ANSYS Maxwell, and establishing an ANSYS Maxwell simulation model;
step 3, respectively calculating electric field enhancement factors of distorted electric fields caused by the top of the head, shoulders, chest and feet when the human body model is below the power transmission line according to the ANSYS Maxwell simulation model established in the step 2; and determining the installation position of the electric field monitoring alarm according to the calculated electric field enhancement factor and by combining the action influence of the working personnel during working.
2. The method for determining the installation position of the electric field monitoring alarm in the extra-high voltage transmission line according to claim 1, wherein the basic parameters of the human body model in the step 1 comprise height, leg length, body length, arm length and head height including neck height.
3. The method for determining the installation position of the electric field monitoring alarm in the extra-high voltage transmission line according to claim 1, wherein the operation parameter of the transmission line in the step 1 comprises operation voltage.
4. The method for determining the installation position of the electric field monitoring alarm in the ultra-high voltage transmission line according to claim 1, wherein the step 3 further comprises obtaining a part of a human body with the smallest influence on an original electric field by analyzing electric field enhancement factors of different parts, and installing the electric field monitoring alarm at the part.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113111557A (en) * | 2021-04-16 | 2021-07-13 | 华北电力大学（保定） | Simulation type human body steady-state electric shock analysis method |
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| CN107845239A (en) * | 2017-12-01 | 2018-03-27 | 同济大学 | A kind of operation on the sea personal security status monitoring and early warning system |
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2020
- 2020-10-28 CN CN202011171706.6A patent/CN112383015B/en active Active
Patent Citations (5)
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| CN101251941A (en) * | 2007-04-06 | 2008-08-27 | 江苏金智科技股份有限公司 | Novel method and device for safety supervising of human body moving target video frequency detection |
| CN203503113U (en) * | 2013-10-21 | 2014-03-26 | 国家电网公司 | Safety cap provided with electric field intensity alarming device |
| CN105448035A (en) * | 2015-12-28 | 2016-03-30 | 云南电网有限责任公司电力科学研究院 | High-voltage line proximity early warning method and device |
| CN106056821A (en) * | 2016-08-13 | 2016-10-26 | 哈尔滨理工大学 | Power-transmission-line foreign-matter-invasion intelligent-video on-line monitoring evaluation system |
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| CN113111557A (en) * | 2021-04-16 | 2021-07-13 | 华北电力大学（保定） | Simulation type human body steady-state electric shock analysis method |
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Effective date of registration: 20210604 Address after: 050070 Hebei city in Shijiazhuang Province, Xinhua District No. 66 Zhong Sheng Lu Applicant after: MAINTENANCE BRANCH COMPANY OF STATE GRID HEBEI ELECTRIC POWER Co. Applicant after: STATE GRID CORPORATION OF CHINA Address before: 050070 Hebei city in Shijiazhuang Province, Xinhua District No. 66 Zhong Sheng Lu Applicant before: MAINTENANCE BRANCH COMPANY OF STATE GRID HEBEI ELECTRIC POWER Co. Applicant before: NORTH CHINA ELECTRIC POWER University (BAODING) |
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