CN113742889B - Insulator selecting method - Google Patents
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- 239000012212 insulator Substances 0.000 title claims abstract description 402
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- G—PHYSICS
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Abstract
The invention relates to a type selection method of an insulator, which comprises the steps of obtaining the actual load of an insulator configured under the actual working condition; configuring an insulator for connecting with the power equipment, wherein one end of the insulator far away from the bottom is a bottom end; selecting a target insulator, acquiring the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio by the ratio of the total moment to the length of the target insulator; obtaining the maximum operation load of the target insulator according to the load ratio; wherein, the maximum operation load and the load ratio are in positive correlation; and if the maximum operation load of the target insulator is greater than or equal to the actual load of the configuration insulator, selecting the target insulator. The target insulator selected according to the maximum operation load can effectively ensure that the target insulator has good mechanical properties in the operation process, avoid faults caused by stress superposition such as vibration and top load, and further avoid the safety problems such as cracking and air leakage.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a method for selecting a type of an insulator.
Background
The direct current wall bushing is a main device for electrically connecting the direct current field main device and the valve tower, and has certain insulating property, so that the power system is well insulated to the ground. The outer insulation part of the direct current wall bushing mainly adopts an insulator. The existing insulator type selection method is various, and has no unified type selection standard, so that the sizes and the types of the insulators in the same working condition are uneven, and safety accidents are easy to cause.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a stable and reliable insulator-selecting method.
A method for selecting the type of an insulator comprises the following steps:
acquiring the actual load of an insulator configured under the actual working condition; the configuration insulator is used for connecting one end of the power equipment to be the bottom end, and one end of the configuration insulator, which is far away from the bottom end, is the top end;
selecting a target insulator, obtaining the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio by the ratio of the total moment to the length of the target insulator;
obtaining the maximum operation load of the target insulator according to the load ratio; wherein the maximum operating load and the load ratio are in positive correlation;
and if the maximum operation load of the target insulator is greater than or equal to the actual load of the configuration insulator, selecting the target insulator.
In one embodiment, if the maximum operating load of the target insulator is greater than or equal to the actual load of the configured insulator, selecting the target insulator further includes:
and if the maximum running load of the target insulator is smaller than the actual load of the configuration insulator, repeatedly selecting the target insulator, acquiring the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio value according to the ratio of the total moment to the length of the target insulator until the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, and selecting the target insulator.
In one embodiment, the maximum operating load is in positive correlation with the load ratio, comprising:
setting a safety coefficient;
obtaining the maximum operating load according to the safety coefficient and the load ratio; the maximum operating load is the product of the safety factor and the load ratio.
Further, the set security coefficient s=s i 1.5; wherein S is i And the safety margin is greater than or equal to 1.1.
In one embodiment, the acquiring the total moment applied to the bottom end of the target insulator includes:
acquiring the top moment of the top bearing load of the target insulator on the bottom of the target insulator;
acquiring wind force moment of external wind force to the bottom end of the target insulator;
acquiring the gravity moment of the gravity of the target insulator to the bottom end of the target insulator;
wherein the total torque is the sum of the tip torque, the wind torque and the gravity torque.
In one embodiment, the obtaining the top moment of the top bearing load of the target insulator to the bottom of the target insulator includes:
acquiring the top load F borne by the top of the target insulator top ；
According to the roofEnd load F top And the length d of the target insulator tip Obtaining the tip moment M of the target insulator tip The method comprises the steps of carrying out a first treatment on the surface of the The tip moment M tip ＝0.7·F top ·d tip 。
In one embodiment, obtaining a wind moment of external wind to the bottom end of the target insulator includes:
acquiring wind pressure rho near the target insulator and acquiring the area S of the windward side of the target insulator in the length direction; and acquiring a center-of-gravity distance d between the center of gravity of the target insulator and the bottom end p ；
According to the wind pressure rho, the windward area S and the gravity center distance d p Obtaining the wind force moment M bw The method comprises the steps of carrying out a first treatment on the surface of the The wind force moment M bw ＝ρ·S·d p 。
In one embodiment, acquiring a gravity moment of the gravity of the target insulator to the bottom end of the target insulator further includes:
if the target insulator is in a motion state under the action of external force, and if the length direction of the target insulator coincides with the gravity direction, acquiring the vertical acceleration a of the target insulator in the length direction v ；
According to the vertical acceleration a v And the mass m of the target insulator to obtain a vertical load F v The method comprises the steps of carrying out a first treatment on the surface of the The vertical load F v ＝m·a v ·k·R·S c +m.g; wherein g is gravitational acceleration; k is an amplification factor; r is a damping response coefficient; s is S c Is a multi-frequency response coefficient;
acquiring a center-of-gravity distance d between the center of gravity of the target insulator and the bottom end p And according to the vertical load F v And the gravity center distance to obtain the gravity moment M bs The method comprises the steps of carrying out a first treatment on the surface of the The gravity moment M bs ＝F v ·d p 。
Further, if the target insulator is in a motion state under the action of external force, the method further comprises:
if the target insulatorAcquiring an included angle a between the length direction and the gravity direction of the target insulator and a horizontal acceleration a of the target insulator in the horizontal direction when the included angle a between the length direction and the gravity direction exists h ；
According to the horizontal acceleration a h And the mass m of the target insulator to obtain a horizontal load F h The method comprises the steps of carrying out a first treatment on the surface of the The horizontal load F h ＝m·a h ·k·R·S c ；
According to the vertical load F v And the horizontal load F h Obtaining the gravity load F b The method comprises the steps of carrying out a first treatment on the surface of the The gravity load F b ＝F h ·sina+F v ·cosa；
According to the gravitational load F b And the center of gravity distance d p Obtaining the gravity moment M bs And (2) a step of performing; the gravity moment M bs `＝F b ·d p 。
In one embodiment, if the maximum operating load of the target insulator is greater than or equal to the actual load of the configured insulator, selecting the target insulator further includes:
if the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, obtaining the actual elastic offset of the configuration insulator according to the actual load of the configuration insulator;
sleeving the target insulator on one end of a horizontal measuring rod; one end of the horizontal measuring rod is connected to a vertical supporting rod, and the target insulator is sleeved on the other end of the horizontal measuring rod;
measuring a first guide rod distance from one end, provided with an insulator in a sleeved mode, of the horizontal measuring rod to the ground, and measuring a first insulator distance from the top end of the target insulator to the ground;
obtaining the maximum elastic offset of the target insulator according to the difference between the first guide rod distance and the first insulator;
and if the maximum elastic offset of the target insulator is smaller than or equal to the actual elastic offset of the configured insulator, selecting the target insulator.
According to the insulator type selection method, the actual load of the configured insulator is obtained, the actual load is taken as a judgment standard, the target insulator is selected, the bottom end of the target insulator is connected to the power equipment, the total moment on the bottom end of the target insulator is obtained, the load ratio of the target insulator is obtained according to the total moment and the length of the target insulator, and the maximum running load of the target insulator can be obtained according to the load ratio. Comparing and selecting the maximum operation load of the target insulator with the actual load of the configuration insulator, and selecting the target insulator if the maximum operation load of the target insulator is greater than or equal to the actual load of the configuration insulator. The target insulator selected according to the maximum operation load can effectively ensure that the target insulator has good mechanical properties in the operation process, avoid faults caused by stress superposition such as vibration and top load, and further avoid the safety problems such as cracking and air leakage. Therefore, the insulator selecting method in the embodiment is safe and reliable, the insulator can be conveniently and rapidly selected according to the total moment and the length of the target edge under the same working condition, and the construction efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for selecting an insulator according to an embodiment;
fig. 2 is a schematic diagram of a review flow of a method for selecting a type of an insulator in another embodiment.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, in an embodiment, a method for selecting a type of an insulator includes the following steps:
step S100: acquiring the actual load of an insulator configured under the actual working condition; the configuration insulator is used for connecting one end of the power equipment to be the bottom end, and one end of the configuration insulator, which is far away from the bottom end, is the top end;
step S200: selecting a target insulator, obtaining the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio by the ratio of the total moment to the length of the target insulator; specifically, the load ratio q=m/d tip The method comprises the steps of carrying out a first treatment on the surface of the Wherein Q is the total moment; d, d tip Is the length of the target insulator.
Step S300: obtaining the maximum operation load of the target insulator according to the load ratio; wherein the maximum operating load and the load ratio are in positive correlation;
step S400: and if the maximum operation load of the target insulator is greater than or equal to the actual load of the configuration insulator, selecting the target insulator.
According to the insulator type selection method, the actual load of the configured insulator is obtained, the actual load is taken as a judgment standard, the target insulator is selected, the bottom end of the target insulator is connected to the power equipment, the total moment on the bottom end of the target insulator is obtained, the load ratio of the target insulator is obtained according to the total moment and the length of the target insulator, and the maximum running load of the target insulator can be obtained according to the load ratio. Comparing and selecting the maximum operation load of the target insulator with the actual load of the configuration insulator, and selecting the target insulator if the maximum operation load of the target insulator is greater than or equal to the actual load of the configuration insulator. The target insulator selected according to the maximum operation load can effectively ensure that the target insulator has good mechanical properties in the operation process, avoid faults caused by stress superposition such as vibration and top load, and further avoid the safety problems such as cracking and air leakage. Therefore, the insulator selecting method in the embodiment is safe and reliable, the insulator can be conveniently and rapidly selected according to the total moment and the length of the target edge under the same working condition, and the construction efficiency is improved.
In one embodiment, if the maximum operating load of the target insulator is greater than or equal to the actual load of the configured insulator, selecting the target insulator further includes:
and if the maximum running load of the target insulator is smaller than the actual load of the configuration insulator, repeatedly selecting the target insulator, acquiring the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio value according to the ratio of the total moment to the length of the target insulator until the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, and selecting the target insulator.
When the maximum operation load of the target insulator is smaller than the actual load of the configuration insulator and the target insulator does not meet the operation requirement under the actual working condition, the target insulator is reselected until the maximum operation load of the selected target insulator is larger than or equal to the actual load of the configuration insulator, and the target insulator is selected. The theoretical maximum running load of the target insulator is not less than the actual load under the actual working condition, and the enough load margin is ensured in the normal running process of the target insulator, so that the normal running of the electric power facility is ensured.
In one embodiment, the maximum operating load is in positive correlation with the load ratio, comprising:
setting a safety coefficient;
obtaining the maximum operating load according to the safety coefficient and the load ratio; the maximum operating load is the product of the safety factor and the load ratio.
The safety coefficient can ensure that the maximum operation load meets the requirement of the actual load, the maximum operation load of the target insulator is not overlarge compared with the actual load, the resource waste is caused, and the target insulator does not have enough load allowance in the normal operation process. And the insulator selected according to the insulator type selection method better meets the requirements under the actual working condition environment.
Specifically, the maximum operating load f=s·q; wherein S is a safety factor.
Further, the set security coefficient s=s i 1.5; wherein S is i And the safety margin is greater than or equal to 1.1. The safety margin is a permissible value of the total uncertainty in measurement and mainly consists of a permissible value of the uncertainty of the measuring instrument and a permissible value of the measurement uncertainty caused by the measurement condition. In the embodiment, the safety margin is valued according to the actual situation, the safety margin is not smaller than 1.1, and the safety margin is reduced by 1.5 times, so that the accuracy of the maximum operation load is ensured.
Specifically, the maximum operating load f=s i ·M/1.5·d tip 。
In one embodiment, the acquiring the total moment applied to the bottom end of the target insulator includes:
acquiring the top moment of the top bearing load of the target insulator on the bottom of the target insulator;
acquiring wind force moment of external wind force to the bottom end of the target insulator;
acquiring the gravity moment of the gravity of the target insulator to the bottom end of the target insulator;
wherein the total torque is the sum of the tip torque, the wind torque and the gravity torque.
The total moment is obtained, various load conditions possibly occurring in the operation of the target insulator are fully considered, the insulator is ensured to have good mechanical characteristics in various environments, and the insulator and related power equipment faults of the insulator caused by load superposition influenced by environmental factors are avoided.
In one embodiment, the obtaining the top moment of the top bearing load of the target insulator to the bottom of the target insulator includes:
acquiring the top load F borne by the top of the target insulator top ；
According to the top load F top And the length d of the target insulator tip Obtaining the tip moment M of the target insulator tip The method comprises the steps of carrying out a first treatment on the surface of the The tip moment M tip ＝0.7·F top ·d tip . Specifically, the tip load F top The range of the value of (C) is 2300N-2500N. Top load F of target insulator top The top load F is determined by the measurement error or the actual working condition top And length d of target insulator tip The product of the voltage is reduced by 0.7 times, and the top load F of the target insulator in the practical use environment is more suitable top 。
In one embodiment, obtaining a wind moment of external wind to the bottom end of the target insulator includes:
acquiring wind pressure rho near the target insulator and acquiring the area S of the windward side of the target insulator in the length direction; and acquiring a center-of-gravity distance d between the center of gravity of the target insulator and the bottom end p ；
According to the wind pressure rho, the windward area S and the gravity center distance d p Obtaining the wind force moment M bw The method comprises the steps of carrying out a first treatment on the surface of the The wind force moment M bw ＝ρ·S·d p . In outdoor environments, the interference of wind on the insulator is always present, so that the wind moment M generated by wind on the target insulator can be obtained through the wind pressure ρ bw The load of the target insulator is more fit with the actual working condition environment.
Further, the cross section of the outer surface of the target insulator along the length direction is wavy, and the area of the windward side of the target insulator along the length direction is obtained, which comprises the following steps:
acquiring the average diameter of the windward side of the target insulator; the average diameter of the target insulator is the average of the maximum diameter and the minimum diameter;
and obtaining the windward area of the target insulator according to the average diameter of the target insulator and the length of the target insulator.
The target insulator is typically composed of an insulating tube, a silicone umbrella skirt, and end metal attachments. The outer surface of the silicon rubber umbrella skirt is a wavy surface, so that the area of the windward side of the target insulator is more reasonable and meets the actual working condition requirement by acquiring the average diameter of the target insulator. Specifically, the range of the wind pressure is 720Pa-740Pa.
In one embodiment, acquiring a gravity moment of the gravity of the target insulator to the bottom end of the target insulator further includes:
if the target insulator is in a motion state under the action of external force, and if the length direction of the target insulator coincides with the gravity direction, acquiring the vertical acceleration a of the target insulator in the length direction v ；
According to the vertical acceleration a v And the mass m of the target insulator to obtain a vertical load F v The method comprises the steps of carrying out a first treatment on the surface of the The vertical load F v ＝m·a v ·k·R·S c +m.g; wherein g is gravitational acceleration; k is an amplification factor; r is a damping response coefficient; s is S c Is a multi-frequency response coefficient;
acquiring a center-of-gravity distance d between the center of gravity of the target insulator and the bottom end p And according to the vertical load F v And the gravity center distance to obtain the gravity moment M bs The method comprises the steps of carrying out a first treatment on the surface of the The gravity moment M bs ＝F v ·d p 。
If the target insulator is interfered by external force in the gravity direction, so that the target insulator has a certain acceleration in the gravity direction, the vertical load F of the target insulator can be obtained by the method v And gravity moment M bs . Specifically, the value of the amplification factor k is 1.5; the saidThe damping response coefficient R has a value of 2.25; the multi-frequency response coefficient S c The value of (2) is 1.5;
further, if the target insulator is in a motion state under the action of external force, the method further comprises:
if the included angle exists between the length direction of the target insulator and the gravity direction, acquiring an included angle a between the length direction of the target insulator and the gravity direction and a horizontal acceleration a of the target insulator in the horizontal direction h ；
According to the horizontal acceleration a h And the mass m of the target insulator to obtain a horizontal load F h The method comprises the steps of carrying out a first treatment on the surface of the The horizontal load F h ＝m·a h ·k·R·S c ；
According to the vertical load F v And the horizontal load F h Obtaining the gravity load F b The method comprises the steps of carrying out a first treatment on the surface of the The gravity load F b ＝F h ·sina+F v ·cosa；
According to the gravitational load F b And the center of gravity distance d p Obtaining the gravity moment M bs And (2) a step of performing; the gravity moment M bs `＝F b ·d p 。
When the length direction of the target insulator forms an included angle a with the gravity direction, the target insulator receives acceleration a in the horizontal direction h And acceleration in the direction of gravity a v Thereby forming a horizontal load F h And gravity load F b . For example, under the extreme conditions such as earthquake, the target insulator and the electric equipment where the target insulator is located can shake, so that the target insulator has horizontal acceleration and vertical acceleration, an included angle is formed between the length direction of the target insulator and the gravity direction, and the stable operation of the target insulator under the extreme conditions is guaranteed by acquiring the load condition of the target insulator under the motion state, so that the reliability and the practicability of the insulator model selection method in the embodiment are improved.
Referring to fig. 2, in one embodiment, if the maximum operating load of the target insulator is greater than or equal to the actual load of the configured insulator, selecting the target insulator includes:
if the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, obtaining the actual elastic offset of the configuration insulator according to the actual load of the configuration insulator;
sleeving the target insulator on one end of a horizontal measuring rod; one end of the horizontal measuring rod is connected to a vertical supporting rod, and the target insulator is sleeved on the other end of the horizontal measuring rod;
measuring a first guide rod distance from one end, provided with an insulator in a sleeved mode, of the horizontal measuring rod to the ground, and measuring a first insulator distance from the top end of the target insulator to the ground;
obtaining the maximum elastic offset of the target insulator according to the difference between the first guide rod distance and the first insulator;
and if the maximum elastic offset of the target insulator is smaller than or equal to the actual elastic offset of the configured insulator, selecting the target insulator.
After the maximum running load of the target insulator meets the actual load requirement, the target insulator is further checked through the steps so as to ensure that the target insulator meets the actual working condition requirement. Under the actual working condition, the target insulator has certain elasticity and can elastically deform when being stressed. The actual elastic offset of the configuration insulator can be obtained after the actual load of the configuration insulator in the actual working condition is known. By comparing the maximum elastic offset of the target insulator with the actual elastic offset of the configured insulator, whether the target insulator meets the design requirement can be judged. The method can also be used as a rechecking method of the maximum operation load of the target insulator.
Further, if the maximum elastic offset of the target insulator is less than or equal to the actual elastic offset of the configured insulator, selecting the target insulator includes:
if the maximum elastic offset of the target insulator is larger than the actual elastic offset of the configuration insulator, repeating the steps of measuring the first guide rod distance to the ground at the end, provided with the insulator, of the horizontal measuring rod sleeve and measuring the first insulator distance to the ground at the top end of the target insulator until the maximum elastic offset of the target insulator is smaller than or equal to the actual elastic offset of the configuration insulator, and selecting the target insulator.
In another embodiment, if the maximum operating load of the target insulator is greater than or equal to the actual load of the configured insulator, selecting the target insulator includes:
if the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, obtaining the actual elastic offset of the configuration insulator according to the actual load of the configuration insulator;
selecting two target insulators, wherein the two target insulators are a left insulator and a right insulator respectively, and the left insulator and the right insulator are sleeved on two ends of a horizontal test rod respectively; the horizontal test rod is arranged on the vertical support rod, and the gravity center of the horizontal test rod is positioned on the axis of the vertical support rod;
measuring a first guide rod distance from one end of the left insulator to the ground, a second guide rod distance from one end of the right insulator to the ground, and a first insulator distance from the top end of the left insulator to the ground, wherein the first guide rod distance from one end of the left insulator to the ground is measured, and the second insulator distance from the top end of the right insulator to the ground is measured;
obtaining a first maximum elastic offset of the left insulator according to the difference between the first guide rod distance and the first insulator; obtaining a second maximum elastic offset of the right insulator according to a difference value between the second guide rod distance and the second insulator;
if the first maximum elastic offset of the left insulator is smaller than or equal to the actual elastic offset of the configured insulator, selecting the left insulator;
and if the second maximum elastic offset of the right insulator is smaller than or equal to the actual elastic offset of the configured insulator, selecting the right insulator.
The two target insulators are arranged at the two ends of the horizontal measuring rod, so that the maximum elastic offset of the two target insulators can be measured simultaneously, and the model selection efficiency is improved. Meanwhile, as the target insulators are arranged at the two ends of the horizontal measuring rod, the moments generated at the two ends of the horizontal measuring rod can be offset, so that the structural stability of the horizontal measuring rod and the vertical supporting rod is guaranteed, the measuring precision of the first guide rod distance, the second guide rod distance, the first insulator distance and the second insulator distance is guaranteed, and the reliability of model selection is improved. Under the condition that no bending test machine exists, the maximum elastic deflection measuring and selecting of the target insulator can be performed through the structures of the horizontal measuring rod and the vertical supporting rod, and the method is convenient, quick and reliable.
Further, a first maximum elastic offset of one of the target insulators is obtained according to the difference between the first guide rod distance and the first insulator; obtaining a second maximum elastic offset of the other target insulator according to the difference between the second guide rod distance and the second insulator, and then comprising:
and obtaining the elastic modulus of the target insulator according to the first maximum elastic offset and the second maximum elastic offset.
Further, the obtaining the elastic modulus of the target insulator according to the first maximum elastic offset and the second maximum elastic offset further includes:
respectively applying loads vertically oriented to the ground to the two ends of the left insulator and the right insulator;
the distance between the left insulator and the right insulator measured and the ground is respectively the distance H between the third insulator Left 1 And H Right 1 A fourth insulator distance, and a length L of the left insulator Left side And the length L of the right insulator Right side ；
According to the first insulator distance H Left 0 Difference from the third insulator distance, second insulator distance H Right 0 Obtaining a length coefficient K from the difference value of the distance between the first insulator and the second insulator; the length coefficient k=1/[ (L) Left side +l Left side )(H Right 0 -H Right 1 )+(L Right side +l Right side )(H Left 0 -H Left 1 )]The method comprises the steps of carrying out a first treatment on the surface of the Wherein l Left side A distance from one end of the left insulator to the gravity center of the horizontal measuring rod is arranged for the horizontal measuring rod; l (L) Right side A distance from one end of the right insulator to the gravity center of the horizontal measuring rod is arranged for the horizontal measuring rod;
according to the length L of the left insulator Left side Length L of the right insulator Right side And a length coefficient K to obtain an elastic modulus E; the elastic modulus e=64 KF Right side (L Right side -h Right side ) 3 (L Left side +l Left side )/[3π(D 4 -d 4 )]+64KF Left side (L Left side -h Left side ) 3 (L Right side +l Right side )/[3π(D 4 -d 4 )]The method comprises the steps of carrying out a first treatment on the surface of the Wherein F is Left side Is a load applied to the left insulator; h is a Left side Is the first guide rod distance; f (F) Right side Is the load exerted on the right insulator; h is a Right side Is the second guide rod distance; d is the average outer diameter of the left insulator and the right insulator; d is the average inner diameter of the left insulator and the right insulator.
The left insulator and the right insulator described above should be regarded as two target insulators which are almost identical, the elastic modulus being the elastic modulus of both the left insulator and the right insulator. Therefore, the elastic modulus of the target insulator and the elastic modulus of the configuration insulator can be compared, and whether the target insulator meets the design requirement or not can be judged.
It should be understood that, although the steps in the flowcharts of fig. 1 and 2 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 1 and 2 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the execution of the steps or stages is not necessarily sequential, but may be performed in turn or alternately with at least a portion of the steps or stages in other steps or other steps.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The insulator type selection method is characterized by comprising the following steps of:
acquiring the actual load of an insulator configured under the actual working condition; the configuration insulator is used for connecting one end of the power equipment to be the bottom end, and one end of the configuration insulator, which is far away from the bottom end, is the top end;
selecting a target insulator, obtaining the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio by the ratio of the total moment to the length of the target insulator;
obtaining the maximum operation load of the target insulator according to the load ratio; wherein the maximum operating load and the load ratio are in positive correlation;
and if the maximum operation load of the target insulator is greater than or equal to the actual load of the configuration insulator, selecting the target insulator.
2. The method of claim 1, wherein if the maximum operating load of the target insulator is greater than or equal to the actual load of the configured insulator, selecting the target insulator further comprises:
and if the maximum running load of the target insulator is smaller than the actual load of the configuration insulator, repeatedly selecting the target insulator, acquiring the total moment born by the bottom end of the target insulator and the length of the target insulator, and obtaining a load ratio value according to the ratio of the total moment to the length of the target insulator until the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, and selecting the target insulator.
3. The method of insulator selection according to claim 1, wherein the maximum operating load is in positive correlation with the load ratio, comprising:
setting a safety coefficient;
obtaining the maximum operating load according to the safety coefficient and the load ratio; the maximum operating load is the product of the safety factor and the load ratio.
4. A method of insulator selection according to claim 3, wherein the set safety factor S = S i 1.5; wherein S is i And the safety margin is greater than or equal to 1.1.
5. The method for selecting a type of insulator according to claim 1, wherein the step of obtaining the total moment applied to the bottom end of the target insulator comprises:
acquiring the top moment of the top bearing load of the target insulator on the bottom of the target insulator;
acquiring wind force moment of external wind force to the bottom end of the target insulator;
acquiring the gravity moment of the gravity of the target insulator to the bottom end of the target insulator;
wherein the total torque is the sum of the tip torque, the wind torque and the gravity torque.
6. The method of claim 5, wherein said obtaining a top moment of a top load of said target insulator to a bottom of said target insulator comprises:
acquiring the top load F borne by the top of the target insulator top ；
According to the top load F top And the length d of the target insulator tip Obtaining the tip moment M of the target insulator tip The method comprises the steps of carrying out a first treatment on the surface of the The tip moment M tip ＝0.7·F top ·d tip 。
7. The method of claim 5, wherein obtaining a wind moment of an external wind force on the bottom end of the target insulator comprises:
acquiring wind pressure rho near the target insulator and acquiring the area S of the windward side of the target insulator in the length direction; and obtaining the weight of the target insulatorCenter of gravity distance d between the center of gravity and the bottom end p ；
According to the wind pressure rho, the windward area S and the gravity center distance d p Obtaining the wind force moment M bw The method comprises the steps of carrying out a first treatment on the surface of the The wind force moment M bw ＝ρ·S·d p 。
8. The method of claim 5, wherein acquiring a gravitational moment of a gravitational force of the target insulator on a bottom end of the target insulator, further comprises:
if the target insulator is in a motion state under the action of external force, and if the length direction of the target insulator coincides with the gravity direction, acquiring the vertical acceleration a of the target insulator in the length direction v ；
According to the vertical acceleration a v And the mass m of the target insulator to obtain a vertical load F v The method comprises the steps of carrying out a first treatment on the surface of the The vertical load F v ＝m·a v ·k·R·S c +m.g; wherein g is gravitational acceleration; k is an amplification factor; r is a damping response coefficient; s is S c Is a multi-frequency response coefficient;
acquiring a center-of-gravity distance d between the center of gravity of the target insulator and the bottom end p And according to the vertical load F v And the gravity center distance to obtain the gravity moment M bs The method comprises the steps of carrying out a first treatment on the surface of the The gravity moment M bs ＝F v ·d p 。
9. The method for selecting an insulator according to claim 8, wherein if the target insulator is in a motion state by an external force, further comprising:
if the included angle exists between the length direction of the target insulator and the gravity direction, acquiring an included angle a between the length direction of the target insulator and the gravity direction and a horizontal acceleration a of the target insulator in the horizontal direction h ；
According to the horizontal acceleration a h And the mass m of the target insulator to obtain a horizontal load F h The method comprises the steps of carrying out a first treatment on the surface of the The horizontal load F h ＝m·a h ·k·R·S c ；
According to the vertical load F v And the horizontal load F h Obtaining the gravity load F b The method comprises the steps of carrying out a first treatment on the surface of the The gravity load F b ＝F h ·sina+F v ·cosa；
According to the gravitational load F b And the center of gravity distance d p Obtaining the gravity moment M bs And (2) a step of performing; the gravity moment M bs `＝F b ·d p 。
10. The method of insulator selection according to any one of claims 1-9, wherein selecting the target insulator if its maximum operating load is greater than or equal to the actual load of the configuration insulator comprises:
if the maximum running load of the target insulator is greater than or equal to the actual load of the configuration insulator, obtaining the actual elastic offset of the configuration insulator according to the actual load of the configuration insulator;
sleeving the target insulator on one end of a horizontal measuring rod; one end of the horizontal measuring rod is connected to a vertical supporting rod, and the target insulator is sleeved on the other end of the horizontal measuring rod;
measuring a first guide rod distance from one end, provided with an insulator in a sleeved mode, of the horizontal measuring rod to the ground, and measuring a first insulator distance from the top end of the target insulator to the ground;
obtaining the maximum elastic offset of the target insulator according to the difference between the first guide rod distance and the first insulator;
and if the maximum elastic offset of the target insulator is smaller than or equal to the actual elastic offset of the configured insulator, selecting the target insulator.
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| PCT/CN2021/131763 WO2023005071A1 (en) | 2021-07-29 | 2021-11-19 | Insulator selection method |
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