CN109768500B - Equipotential operation path planning method for tension tower and hanging basket method of extra-high voltage alternating current line - Google Patents
Equipotential operation path planning method for tension tower and hanging basket method of extra-high voltage alternating current line Download PDFInfo
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Abstract
An equipotential operation path planning method of an extra-high voltage alternating current line tension tower hanging basket method is characterized in that air humidity H, ambient temperature T and current air pressure P during operation are obtained by measuring meteorological parameters of a geographical position where an extra-high voltage alternating current transmission line tension tower live working tower is located, and the relative dielectric constant of air is obtained; determining the position of an equipotential operator in a hanging basket, and then performing electric field calculation on the human body surface field intensity of each operation track point; and comparing the body surface field intensity of the human body at each operating point with the critical corona starting field intensity of the conducting wire, finally determining ten operating track points, and connecting ten operating track low points meeting the requirements into an arc line to obtain the equipotential operation planning path of the tension tower and hanging basket method of the extra-high voltage alternating current line. The method considers the environmental factors of the operation tower, and provides theoretical basis and guidance for safety of live working aiming at the hanging basket method equipotential operation path planned by the tension tower of the ultra-high voltage alternating current transmission line.
Description
Technical Field
The invention discloses an ultra-high voltage alternating current line tension tower hanging basket method equipotential operation path planning method considering environmental factors, and relates to the technical field of ultrahigh power transmission line engineering and hanging basket method equipotential operation path planning.
Background
The equipotential operation mode is most widely applied to live working of a high-voltage transmission line with technical advantages, but during live working of the ultra-high-voltage alternating-current transmission line, due to the fact that the operating voltage of the ultra-high-voltage alternating-current transmission line is high, the electric field intensity around a charged body is high, the ultra-high-voltage transmission line is long, geographical and climatic environments along the line are complex, and the influence on safety of operating personnel is larger, and therefore research on the equipotential optimal mode of the charged operation, the combination gap, the entering and exiting of the operating personnel and the like is. The method is characterized in that the process of realizing equipotential by the hanging basket method is that an operator wears a shielding clothes to sit in an insulating hanging basket, and the position of the equipotential operator is controlled by the operator on the tower by adjusting the rope lengths at two ends, so that the equipotential operator can reach a conducting wire from a certain position of a cross arm of a tower to realize equipotential operation. At present, the operation mode is widely applied to live working, but the mode of entering a strong electric field and path planning affect the safety of operators.
At present, the mode of entering field intensity of an ultra-high voltage alternating current transmission line tension tower theoretically and practically is that an electric field enters along a tension insulator string by a method of spanning two short three, also called a free equipotential method, but before the method is used, all tension insulator porcelain insulators of the tension insulator string need to be charged to zero (namely, the tension insulator string is determined to be intact to meet the regulation requirement), before the method is used, the insulators need to be detected (the glass insulators do not need to be detected), in the advancing process, feet need to step on one string of insulators, hold the other string of insulators, move the hands and the feet synchronously and transversely, and the action degree is avoided to be overlarge as much as possible. The method is widely adopted in the live working of 500kV ultrahigh voltage transmission lines. However, due to the characteristics of the ultra-high voltage transmission line, the method is difficult to adopt. There are problems in that:
(1): more than 80% of the tension tower of the extra-high voltage line is a porcelain insulator, and the length of the insulator string exceeds 15 meters, so that the detection is difficult;
(2): the distance between the insulator strings is overlarge, the horizontal distance between the two insulator strings generally exceeds 60 cm, and the heavy ice area reaches 1 m. The operator needs to transversely move in a push-up-like posture to sequentially span over 70 insulators, so that the difficulty is great.
Disclosure of Invention
Aiming at the defects, the invention provides a method for planning an equipotential operation path of an extra-high voltage alternating current transmission line tension tower hanging basket method by considering environmental factors, which aims at the tension tower of the extra-high voltage transmission line, adopts a mode of entering a strong electric field by adopting the hanging basket method, considers the change of the environmental factors, and provides theoretical basis and guidance for the safety of live operation aiming at the equipotential operation path of the tension tower of the extra-high voltage alternating current transmission line entering the strong electric field by adopting the hanging basket method on the premise that the body surface field intensity of equipotential operation personnel meets the requirement of the electric field.
The technical scheme adopted by the invention is as follows:
an ultra-high voltage alternating current transmission line strain tower hanging basket method equipotential operation path planning method considering environmental factors obtains air humidity H, ambient temperature T and current air pressure P during operation by measuring meteorological parameters of geographic positions of strain tower live working towers of the ultra-high voltage alternating current transmission line, and obtains the relative dielectric constant of air on the basis; preliminarily determining the position of an equipotential operator in the hanging basket by determining the length of the operation rope and judging the combined gap, and then performing electric field calculation on the body surface field intensity of each operation track point; and comparing the body surface field intensity of each operating point with the critical corona starting field intensity of the lead, finally determining ten operating path planning points, and connecting the ten operating path planning points meeting the requirements into an arc line to obtain the ultra-high voltage alternating current line hanging basket method equipotential operating planning path.
The equipotential operation process is the process of realizing that the operating personnel goes from the cross arm position to the hard jumper wire of special high voltage alternating current transmission line strain insulator tower, and the operating personnel reaches hard jumper wire department, need climb to the conductor of special high voltage alternating current transmission line strain insulator tower from hard jumper wire department.
An ultra-high voltage alternating current line tension tower basket method equipotential operation path planning method considering environmental factors comprises the following steps:
step 1: measuring the air humidity H, the ambient temperature T and the current air pressure P of the geographical position of the operation tower;
step 2: the relative dielectric constant epsilon of the air, the air humidity, the air temperature and the air pressure are in relation, the relative dielectric constant epsilon of the air is larger along with the increase of the air humidity, is reduced along with the increase of the air temperature and is increased along with the increase of the air pressure;
and step 3: determining a coordinate system of an operation tower, taking a center point of the tower where an operation cross arm is located as a coordinate origin, determining a rope length L1 of a first rope and a rope length L2 of a second rope, wherein the rope length L2 of the second rope is equal to the sum of the length of a suspension insulator string and the length of a hardware fitting, ensuring that the rope length L2 of the second rope is unchanged in the operation process, and ensuring that the rope length of the first rope is changed in the operation process to ensure that the rope length of the first rope is changed
The angle theta is an included angle between the cross arm of the tower and the second rope; the second rope hanging point is positioned at the cross arm vertically above the suspension insulator string, and the distance between the first rope hanging point and the second rope hanging point is equal to the rope length L2 of the second rope; before the equipotential operation begins, the equipotential operation personnel are located at the hanging point of the first rope and sit in the hanging basket, then the first rope is released, the angle theta is taken to be 10 degrees, and the rope length of the first rope is made to be long
Determining a first operating path planning point at which the position in space of an operator in the basket is required to satisfy equation (1)
And calculating S1+ S3 and S2+ S3 of the space position, if the distances are both larger than 6.9m at the moment, the requirement is met, and if the distances meet the requirement, calculating the electric field intensity E of the equipotential operating personnel at the point. The body surface field intensity E of the equipotential operator in the space can be obtained by calculating phi through the formula (2) and substituting the calculated phi into the formula (3).
In the formula:
is a Laplace operator;
phi is a potential scalar;
ρ is the free charge density;
ε is the relative dielectric constant of air;
x, y and z are rectangular coordinates of the operator with the medium potential in the space;
e is the body surface electric field intensity of the equipotential operator.
The selected operation track points need to satisfy the formula (1) and the electric field intensity E needs to be smaller than the critical corona starting field intensity E of the leadcr. The body surface field intensity of the equipotential operating personnel passing through the shielding ring in the insulating hanging basket at the point is smaller than the critical corona-initiating field intensity of the lead to ensure the safety of the equipotential operating personnel, and the critical corona-initiating field intensity of the lead is calculated according to the formula (4)
δ in formula (4) is the relative density of air;
r0radius of the corona wire, unit: cm;
and m is the state coefficient of the surface of the wire, and the value of m is 0.8-1.0.
Step 4, determining the remaining 9 operation path planning points, and sequentially increasing the theta angle by 10 degrees according to the method for determining the first operation path planning point in the step 3, so that the theta angle is sequentially equal to 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees and 80 degrees, and the rope length of the first rope is made to be the same as the rope length of the first rope
To determine a second, third, fourth, fifth, sixth, seventh, eighth job path planning point; and the ninth operation path planning point is determined, at the moment, the operator in the hanging basket is positioned above the horizontal position of the conducting wire, the length of S3 is 0.5m, the included angle between the second rope and the suspension insulator string is alpha,
the theta of the operation track point is 90-alpha, so that the length of the first rope is equal to the length of the first rope
To determine the ninth oneA working path planning point;
after each path planning point determines the operation position according to the operation rope length, calculating the values of S1+ S3 and S2+ S3 of the space position, and checking whether the requirements of a formula (1) and the electric field intensity are met; if the ten operation path planning points meet the requirements of the formula (1) and the electric field intensity after verification, the ten operation path planning points are connected into a line, namely the operation path of the equipotential operation planning of the extra-high voltage alternating current line hanging basket method.
The invention relates to a method for planning an equipotential operation path of a tension tower and a hanging basket method of an extra-high voltage alternating-current transmission line, which considers environmental factors of an operation tower, and provides theoretical basis and guidance for safety of live working aiming at the equipotential operation path of the hanging basket method planned by the tension tower of the extra-high voltage alternating-current transmission line on the premise that a body surface field intensity electric field of an operator meets the requirement of the electric field.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a general model diagram of the tension tower-basket method.
Fig. 2 is a spatial position diagram of equipotential operators in a tension tower basket.
FIG. 3 is a diagram of the operation position of the tension tower basket method operation 0.5m away from the hard jumper.
Fig. 4 is a diagram of equipotential operation positions by a tension tower basket method.
FIG. 5 is a cloud chart of finite element calculation of electric field intensity of a body surface of a human body during equipotential operation by a tension tower hanging basket method.
FIG. 6 is a diagram of an overall model of a linear corner tension tower-basket method operation.
Fig. 7 is a spatial position diagram of equipotential operators in a linear corner tension tower basket.
FIG. 8 is a diagram showing the operating positions of the strain tower at the straight line corner and 0.5m away from the conducting wire in the hanging basket method.
FIG. 9 is a diagram of equipotential operation positions by a linear corner tension tower basket method.
FIG. 10 is a cloud chart calculated by finite element of the body surface field intensity of a human body during equipotential operation by a straight-line corner tension tower hanging basket method.
Detailed Description
An ultra-high voltage alternating current transmission line strain tower hanging basket method equipotential operation path planning method considering environmental factors, through measuring the meteorological parameter of the geographic position of the live working tower of the ultra-high voltage alternating current transmission line, get air humidity H, ambient temperature T, and atmospheric pressure P at that time while working, get the relative dielectric constant of the air on this basis; preliminarily determining the position of an equipotential operator in the hanging basket by determining the length of the operation rope and judging the combined gap, and then performing electric field calculation on the body surface field intensity of each operation track point; and comparing the body surface field intensity of each operating point with the critical starting field intensity of the conducting wire, finally determining ten operating track points, and connecting the ten operating track low points meeting the requirements into an arc line to obtain the equipotential operation planning path of the extra-high voltage alternating current line hanging basket method. And aiming at specific parameters of a certain extra-high voltage alternating current transmission line, establishing a tower cross arm, a hanging basket, a human body, an insulator, a conducting wire and a hardware fitting model of the extra-high voltage alternating current transmission line according to specific geometric dimensions, substituting the parameter values into the model for calculating a rope, and calculating the body surface field intensity of an equipotential operator to obtain a planned path of the extra-high voltage transmission line hanging basket method equipotential operation considering environmental factors.
The method specifically comprises the following steps:
1) measuring the air humidity H, the ambient temperature T and the current air pressure P of the geographical position of the operation tower;
2) the relative dielectric constant epsilon of the air is in relation with the humidity, the temperature and the air pressure of the air, the relative dielectric constant epsilon of the air is increased along with the increase of the humidity of the air, is reduced along with the increase of the temperature and is increased along with the increase of the air pressure; specific data are shown in table 1 and table 2;
TABLE 1 relationship between the relative dielectric constant ε of air and temperature and air pressure
TABLE 2 relationship between the relative dielectric constant ε of air and humidity and air pressure
3) Determining a coordinate system of an operation tower, determining a rope length L1 of a first rope and a rope length L2 of a second rope by taking a center point of the tower where an operation cross arm is located as a coordinate origin, wherein the rope length L2 of the second rope is equal to the sum of the length of a suspension insulator string and the length of a hardware fitting, ensuring that the rope length L2 of the second rope is unchanged in the operation process, and ensuring that the rope length of the first rope is changed in the operation process to ensure that the rope length of the first rope is changed
The angle theta is an included angle between the cross arm of the tower and the second rope; the second rope hanging point is positioned at the cross arm vertically above the suspension insulator string, and the distance between the first rope hanging point and the second rope hanging point is equal to the rope length L2 of the second rope; before the equipotential operation begins, the equipotential operation personnel are located at the hanging point of the first rope and sit in the hanging basket, then the first rope is released, the angle theta is taken to be 10 degrees, and the rope length of the first rope is made to be long
Determining a first operating path planning point at which the position in space of an operator in the basket is required to satisfy equation (1)
And calculating S1+ S3 and S2+ S3 of the space position, if the distances are both larger than 6.9m at the moment, the requirement is met, and if the distances meet the requirement, calculating the electric field intensity E of the equipotential operating personnel at the point. The body surface field intensity E of the equipotential operator in the space can be obtained by calculating phi through the formula (2) and substituting the calculated phi into the formula (3).
In the formula
Is a Laplace operator;
phi is a potential scalar;
ρ is the free charge density;
ε is the relative dielectric constant of air;
x, y and z are rectangular coordinates of the operator with the medium potential in the space;
e is the body surface electric field intensity of the equipotential operator.
The selected operation track points need to satisfy the formula (1) and the electric field intensity E needs to be smaller than the critical corona starting field intensity E of the leadcr. The body surface field intensity of the equipotential operating personnel passing through the shielding ring in the insulating hanging basket at the point is smaller than the critical corona-initiating field intensity of the lead to ensure the safety of the equipotential operating personnel, and the critical corona-initiating field intensity of the lead is calculated according to the formula (4)
δ in formula (4) is the relative density of air;
r0radius of the corona wire, unit: cm;
and m is the state coefficient of the surface of the wire, and the value of m is 0.8-1.0.
4) Determining the remaining 9 operation path planning points, and sequentially increasing the angle theta by 10 degrees according to the method for determining the first operation track point in the step 3) so that the angle theta is sequentially equal to 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees and 80 degrees and the length of the rope is made to be long
To determine the second, third, fourth, fifth, sixth, seventh, and eighth job path points. The ninth operation path point is determined, the operator in the hanging basket is positioned above the horizontal position of the wire at the moment, the length of S3 is 0.5m, the included angle between the rope length L2 and the suspension insulator string is alpha at the moment,
the theta of the operation track point is 90-alpha, so that the rope is long
To determine a ninth job path point. The tenth operation path point is determined, an operator needs to arrive at the wire, when the operator arrives at the ninth operation path point, because the operator is flush with the wire, the horizontal distance from the wire is 0.5m, at the moment, the equipotential operator in the hanging basket needs to rapidly hold the arc suppression tool to contact the extra-high voltage wire, and when the operator contacts the wire, the included angle between L1 and L2 is 90 degrees, so that the length of the rope is made to be long
After the operation position of each track point is determined according to the operation rope length, the values of S1+ S3 and S2+ S3 of the space position are calculated, and whether the requirements of the formula (1) and the electric field strength are met or not is checked. If the ten operation track points meet the requirements of the formula (1) and the electric field intensity through verification, the ten operation track points can be connected into a line, namely, the operation path of the equipotential operation planning of the tension tower basket method of the extra-high voltage alternating current line.
The concrete calculation example is as follows:
taking the tension tower hanging basket method operation of Huainan-Nanjing-Shanghai-1000 kV ultra-high voltage transmission line engineering as an example:
according to the process described in the step 1), the tower model of the Huainan-Nanjing-Shanghai 1000kV Taiwui/II line 568 tower is SJV321, and the tower model of the Shanghai 1000kV Taiwui/II line is SJV, and the tower model is operated in the tower 10 in 11 months and 2018, and the ambient temperature T is measured to be 19 degrees, the relative humidity H (%) of the air is 55.7, and the air pressure P (Torr) is 756.45.
According to the process described in step 2), the relative dielectric constant epsilon of the air is obtained by looking up a table according to the environmental parameters measured in step 1), wherein the relative dielectric constant epsilon is 1.000668.
Determining a coordinate system of the operation tower according to the process described in the step 3), and taking the center of the lower cross arm of the operation tower as an origin of coordinates; the length of the operation cross arm is 12.4m, the length of the hard jumper insulator string and the total length of the hardware are 11m, so that the length of the operation rope L2 is 11m, the L2 is kept unchanged in the operation process, the hanging point of L2 is hung on the cross arm A above the middle of the two hard jumper insulators, the hanging point of L1 is hung on the cross arm B11 m away from the hanging point of L2, and a tension tower-basket method operation overall model diagram is established, as shown in FIG. 1. Before the operation is started, an equipotential operator is at the hanging point of L1 and sits in the hanging basket, and then the operator releases the operation rope L1 to enable the operator to work
Since θ is 10 °, L2 is 11m, and L1 is 1.92m, the length of the working rope L1 that should be released by the operator is 1.92m, the first working trajectory point is obtained, S1 is the horizontal distance from the tower to the equipotential operator sitting in the nacelle, S2 is the vertical distance from the tower to the equipotential operator sitting in the nacelle, S3 is the distance from the equipotential operator sitting in the nacelle to the conductor, and the spatial position diagram of the equipotential operator in the nacelle is shown in fig. 2. At this time, S1 ═ 1.772 m; s2 ═ 1.913 m; s3 ═ 14.139 m. Satisfy formula (1)
Then, the body surface electric field intensity of the human body sitting in the hanging basket by wearing the shielding clothes is obtained by finite element calculation, EmaxAt 5.8kV/m, calculating the critical corona field intensity of the wire according to the formula
δ＝1.293kg/m3M is the state coefficient of the surface of the conductor, considering the structure of the eight-split conductor, and the value of m is 0.85. r is0The radius of the corona-starting conductor is equal to the external diameter of the extra-high voltage eight-bundle sub-conductor33.8mm, equivalent radius converted to wire of 350mm, Ecr2690.1 kV/m. The comparison was made to find Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe.
The remaining 9 job path planning points are determined according to the procedure described in step 4). When the second operation path point is determined, the operation rope length is released to ensure that
When θ is 20 °, L2 is 11m, L1 is 3.82m, and the second working path point is obtained, S1 is 2.193 m; s2 ═ 3.819 m; s3 ═ 12.569 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝6.9kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the third operation path point is determined, the operation rope length is released, so that
When θ is 30 °, L2 is 11m, L1 is 5.69m, and the third working path point is obtained, S1 is 2.897 m; s2 ═ 5.496 m; s3 ═ 11 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝11.8kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. Releasing the working rope length when determining the fourth working path pointTo make
When θ is 40 °, L2 is 11m, L1 is 7.52m, and the fourth working path point is obtained, S1 is 3.917 m; s2 ═ 7.067 m; s3 ═ 9.302 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝40.1kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the fifth operation path point is determined, the operation rope length is released, so that
When θ is 50 °, L2 is 11m, L1 is 9.30m, and the fifth working path point is obtained, S1 is 5.210 m; s2 ═ 8.428 m; s3 ═ 7.522 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝50.6kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the sixth working path point is determined, the working rope length is released, so that
When θ is 60 °, L2 is 11m, L1 is 11m, and the sixth working path point is obtained, S1 is 6.723 m; s2 ═ 9.526 m; s3 ═ 5.695 m. Satisfy formula (1)
And calculating the electric field intensity of the body surface of the operator by using a finite element method to obtain a value Emax＝198.2kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the seventh operation path point is determined, the operation rope length is released, so that
When θ is 70 °, L2 is 11m, L1 is 12.62m, and the seventh working path point is obtained,
s1 ═ 8.071 m; s2 ═ 10.243 m; s3 ═ 4.081 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝250.5kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the eighth working path point is determined, the working rope length is released, so that
When θ is 80 ° and L2 is 11m, and L1 is 14.14m, the eighth working path point is obtained, and in this case, S1 is 10.094 m; s2 ═ 10.833 m; s3 ═ 1.917m, satisfying formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝798kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. Determining the ninth working pathWhen the diameter is smaller, the operator in the hanging basket reaches the horizontal position of the wire in the vertical direction, the horizontal position is 0.5m away from the wire, the operation position diagram of the hanging basket method operation is 0.5m away from the wire, as shown in the figure (3), the included angle between the rope length L2 and the suspension insulator string at the moment is calculated to be alpha, and the included angle is calculated according to a formula
Theta 90-alpha 87.4, and the length of the rope is increased
When θ is 87.4 ° and L2 is 11m, L1 is 15.2m, and S1 is 11.491 m; s2 ═ 10.989 m; s3 ═ 0.5 m. Satisfy formula (1)
And calculating the body surface electric field intensity of the operator by using a finite element method, wherein the maximum body surface electric field intensity of the body is E when the hanging basket method works and is 0.5m away from the hard jumper wiremax＝1260kV/m，Emax<Ecr，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. The tenth operation path point is determined, an operator needs to arrive at the wire, when the operator arrives at the ninth operation path point, because the operator is flush with the wire, the horizontal distance from the wire is 0.5m, at the moment, the equipotential operator in the hanging basket needs to rapidly hold the arc suppression tool to contact the extra-high voltage wire, and when the operator contacts the wire, the included angle between L1 and L2 is 90 degrees, so that the length of the rope is made to be long
Fig. 4 shows an equipotential work position diagram of the basket method when L1 is 15.2 m. At this time, S1 ═ 11.98m, S2 ═ 11 m; s3 ═ 0 m; satisfy formula (1)
And calculating the electric field intensity of the body surface of the operator by finite element method, and calculating a cloud chart of the finite element field intensity of the body surface of the operator when the hanging basket method is operated at equipotential as shown in FIG. 5, Emax＝1583kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe.
Taking the operations of Huainan-Nanjing-Shanghai-1000 kV ultrahigh voltage transmission line engineering straight-line corner strain tower hanging basket method as an example:
according to the process described in the step 1), the Huainan-Nanjing-Shanghai 1000kV Taiwui/II line 537 pole tower is operated, the model of the pole tower is SZJV322, the pole tower is operated in the place 11 months and 10 months in 2018, the ambient temperature T at that time is measured to be 19 degrees, the relative humidity of the air is measured to be 55.7 percent, and the air pressure P (Torr) is 756.45.
According to the process described in step 2), the relative dielectric constant epsilon of the air is obtained by looking up a table according to the environmental parameters measured in step 1), wherein the relative dielectric constant epsilon is 1.000668.
According to the process described in step 2), the relative dielectric constant epsilon of the air is obtained by looking up a table according to the environmental parameters measured in step 1), wherein the relative dielectric constant epsilon is 1.000668.
Determining a coordinate system of the operation tower according to the process described in the step 3), and taking the center of the lower cross arm of the operation tower as an origin of coordinates; the length of the operation cross arm is 18.7m, the length of the V-string flange string and the total length of the hardware are 12.4m, the included angle between the two insulators forming the V-string is 90 degrees, so the length of the operation rope L2 is 12.4 Xcos 45 degrees to 8.8m, L2 is kept unchanged in the operation process, the hanging point of L2 is hung at the middle cross arm A of the V-string insulator, the hanging point of L1 is hung at the position B on the cross arm 8.8m away from the hanging point of L2, and a straight-line corner tension tower basket operation integral model diagram is established, as shown in FIG. 6. Before the operation is started, an equipotential operator is at the hanging point of L1 and sits in the hanging basket, and then the operator releases the operation rope L1 to enable the operator to work
Since θ is 10 °, L2 is 8.8m, and L1 is 1.53m, the operator should release the working rope L1 to a length of 1.53m to obtain the first workThe method comprises the following steps of determining a track point, wherein S1 is the horizontal distance between an equipotential operator sitting in a hanging basket and a tower body, S2 is the vertical distance between the equipotential operator sitting in the hanging basket and the tower, S3 is the distance between the equipotential operator sitting in the hanging basket and a reverse lead, and a spatial position diagram of the equipotential operator in a straight-line corner tension tower hanging basket is shown in FIG. 7. At this time, S1 is 2.198 m; s2 ═ 1.524 m; s3 ═ 11.268 m. Satisfy formula (1)
Then, the body surface electric field intensity of the human body sitting in the hanging basket by wearing the shielding clothes is obtained by finite element calculation, EmaxAt 10.9kV/m, calculating the critical corona field intensity of the wire according to the formula
δ＝1.293kg/m3M is the state coefficient of the surface of the conductor, considering the structure of the eight-split conductor, and the value of m is 0.85. r is0The outer diameter of the extra-high voltage eight-split sub-conductor is 33.8mm as the radius of the corona-generating conductor, the equivalent radius of the conductor is converted into 350mm, Ecr2690.1 kV/m. The comparison was made to find Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe.
The remaining 9 job path planning points are determined according to the procedure described in step 4). When the second operation path point is determined, the operation rope length is released to ensure that
When θ is 20 °, L2 is 8.8m, L1 is 3.06m, and a second working path point is obtained, in which case S1 is 2.538 m; s2 ═ 3.013 m; s3 ═ 10.049 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝12.3kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the third operation path point is determined, the operation rope length is released, so that
When θ is 30 °, L2 is 8.8m, L1 is 4.56m, and the third working path point is obtained, S1 is 2.12 m; s2 ═ 5.496 m; s3 ═ 11 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝11.6kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the fourth operation path point is determined, the operation rope length is released, so that
When θ is 40 °, L2 is 8.8m, L1 is 6.02m, and a fourth working path point is obtained, S1 is 3.963 m; s2 ═ 5.657 m; s3 ═ 7.406 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝48.8kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the fifth operation path point is determined, the operation rope length is released, so that
When θ is 50 °, L2 is 8.8m, L1 is 7.44m, and the fifth working path point is obtained, S1 is 5.007 m; s2 ═ 6.743 m; s3 ═ 5.992 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝180.6kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the sixth working path point is determined, the working rope length is released, so that
When θ is 60 °, L2 is 8.8m, and L1 is 8.8m, a sixth working path point is obtained, in which case S1 is 6.227 m; s2 ═ 7.621 m; s3 ═ 4.536 m. Satisfies formula (1):
and calculating the electric field intensity of the body surface of the operator by using a finite element method to obtain a value Emax＝230.2kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the seventh operation path point is determined, the operation rope length is released, so that
When θ is 70 °, L2 is 8.8m, L1 is 10.09m, and a seventh working path point is obtained, S1 is 7.572 m; s2 ═ 8.267 m; s3 ═ 3.108 m. Satisfy formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝388.6kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the eighth working path point is determined, the working rope length is released, so that
When θ is 80 °, L2 is 8.8m, L1 is 11.31m, and the eighth working path point is obtained, S1 is 9.056 m; s2 ═ 8.666 m; s3 ═ 1.531m, satisfying formula (1)
And the finite element method is used to calculate the electric field intensity on the body surface of the operator at the moment, Emax＝1001.1kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. When the ninth operation path point is determined, the operator in the hanging basket reaches the horizontal position of the wire in the vertical direction at the moment, the horizontal position is 0.5m away from the wire, the operation of the straight-line corner strain tower hanging basket method is 0.5m away from the wire, as shown in the figure 8, the included angle between the rope length L2 and the suspension insulator string at the moment is calculated to be alpha, and the included angle is calculated according to a formula
To obtain theta 90-alpha 86.74 to make the rope long
When θ is 87.4 °, L2 is 8.8m, and L1 is 12.09m, S1 is 10.085 m; s2 ═ 8.786 m; s3 ═ 0.5 m. Satisfies formula (1):
and performing this by using a finite element methodCalculating the electric field intensity of the body surface of an operator, wherein the maximum field intensity of the body surface of the operator is E when the operator works by a hanging basket method and is 0.5m away from a hard jumpermax＝1262kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe. The tenth operation path point is determined, an operator needs to arrive at the wire, when the operator arrives at the ninth operation path point, because the operator is flush with the wire, the horizontal distance from the wire is 0.5m, at the moment, the equipotential operator in the hanging basket needs to rapidly hold the arc suppression tool to contact the extra-high voltage wire, and when the operator contacts the wire, the included angle between L1 and L2 is 90 degrees, so that the length of the rope is made to be long
Fig. 9 shows an equipotential work position diagram of a straight corner tension tower basket method with L1 equal to 15.2 m. At this time, S1 ═ 11.66m, S2 ═ 11 m; s3 ═ 0 m; satisfy formula (1)
And calculating the electric field intensity of the body surface of the operator by using a finite element method, calculating a cloud picture by using the finite element of the electric field intensity of the body surface of the operator when the electric potential is equal to the electric potential by using a linear corner tension tower and hanging basket method, and showing that E is shown in figure 10max＝1583kV/m，Emax<EcrAt this time, the body surface field intensity is smaller than the critical corona onset field intensity of the lead, the discharge phenomenon cannot occur, and the operating personnel are safe.
Claims (1)
1. An ultra-high voltage alternating current line tension tower basket method equipotential operation path planning method considering environmental factors is characterized by comprising the following steps:
step 1: measuring the air humidity H, the ambient temperature T and the current air pressure P of the geographical position of the operation tower;
step 2: the relative dielectric constant epsilon of the air, the air humidity, the air temperature and the air pressure are in relation, the relative dielectric constant epsilon of the air is larger along with the increase of the air humidity, is reduced along with the increase of the air temperature and is increased along with the increase of the air pressure;
and step 3: determining a coordinate system of an operation tower, taking a center point of the tower where an operation cross arm is located as a coordinate origin, determining a rope length L1 of a first rope and a rope length L2 of a second rope, wherein the rope length L2 of the second rope is equal to the sum of the length of a suspension insulator string and the length of a hardware fitting, ensuring that the rope length L2 of the second rope is unchanged in the operation process, and ensuring that the rope length of the first rope is changed in the operation process to ensure that the rope length of the first rope is changed
The angle theta is an included angle between the cross arm of the tower and the second rope; the second rope hanging point is positioned at the cross arm vertically above the suspension insulator string, and the distance between the first rope hanging point and the second rope hanging point is equal to the rope length L2 of the second rope; before the equipotential operation begins, the equipotential operation personnel are located at the hanging point of the first rope and sit in the hanging basket, then the first rope is released, the angle theta is taken to be 10 degrees, and the rope length of the first rope is made to be long
Determining a first operating path planning point at which the position in space of an operator in the basket is required to satisfy equation (1)
Calculating the space positions of S1+ S3 and S2+ S3, wherein S1 is the horizontal distance from the tower body of the equipotential operator sitting in the hanging basket, S2 is the vertical distance from the tower of the equipotential operator sitting in the hanging basket, and S3 is the distance from the equipotential operator sitting in the hanging basket to the lead;
if the distances are larger than 6.9m at the moment, the requirement is met, and if the distances meet the requirement, the electric field intensity E of the equipotential operating personnel at the point is calculated; calculating phi through a formula (2), substituting the calculated phi into a formula (3), and calculating the body surface field intensity E of the equipotential operating personnel in the space;
in the formula:
is a Laplace operator;
phi is a potential scalar;
ρ is the free charge density;
ε is the relative dielectric constant of air;
x, y and z are rectangular coordinates of the operator with the medium potential in the space;
e is the body surface electric field intensity of the equipotential operator;
the selected operation track points need to satisfy the formula (1) and the electric field intensity E needs to be smaller than the critical corona starting field intensity E of the leadcr(ii) a The body surface field intensity of the equipotential operating personnel passing through the shielding ring in the insulating hanging basket at the point is smaller than the critical corona-initiating field intensity of the lead to ensure the safety of the equipotential operating personnel, and the critical corona-initiating field intensity of the lead is calculated according to the formula (4)
δ in formula (4) is the relative density of air;
r0radius of the corona wire, unit: cm;
m is a state coefficient of the surface of the wire, and the value of m is 0.8-1.0;
step 4, determining the remaining 9 operation path planning points, and sequentially increasing the theta angle by 10 degrees according to the method for determining the first operation path planning point in the step 3, so that the theta angle is sequentially equal to 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degreesAngle, length of first rope
To determine a second, third, fourth, fifth, sixth, seventh, eighth job path planning point; and the ninth operation path planning point is determined, at the moment, the operator in the hanging basket is positioned above the horizontal position of the conducting wire, the length of S3 is 0.5m, the included angle between the second rope and the suspension insulator string is alpha,
the theta of the operation track point is 90-alpha, so that the length of the first rope is equal to the length of the first rope
To determine a ninth work path planning point;
and determining a tenth operation path planning point, wherein an operator needs to arrive at the wire, when the operator arrives at a ninth operation path planning point, the equipotential operator in the hanging basket holds an arc suppression tool to contact the extra-high voltage wire, and when the operator contacts the wire, an included angle between L1 and L2 is 90 degrees, so that the length of the first rope is made to be longer
After each path planning point determines the operation position according to the operation rope length, calculating the values of S1+ S3 and S2+ S3 of the space position, and checking whether the requirements of a formula (1) and the electric field intensity are met; if the ten operation path planning points meet the requirements of the formula (1) and the electric field intensity after verification, the ten operation path planning points are connected into a line, namely the operation path of the equipotential operation planning of the extra-high voltage alternating current line hanging basket method.
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| US4478312A (en) * | 1982-09-30 | 1984-10-23 | Kurtgis Michael P | System and portable cage for servicing power transmission lines |
| KR20080024852A (en) * | 2006-09-15 | 2008-03-19 | 한국전기공사협회 | Live-line changing method of the damaged spacer damper for 765kv double circuit transmission lines |
| KR20080044012A (en) * | 2006-11-15 | 2008-05-20 | 한국전기공사협회 | Barehand method to live line for 765kv double circuit transmission lines using a helicopter |
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| CN104979776A (en) * | 2015-07-10 | 2015-10-14 | 中国电力科学研究院 | Method for entering equipotential level for tension support of UHV transmission line |
| CN107941273B (en) * | 2017-11-15 | 2022-01-18 | 国网湖南省电力公司检修公司 | Live working safety early warning method and device |
| CN108133510A (en) * | 2017-12-18 | 2018-06-08 | 国网江苏省电力有限公司检修分公司 | Ultra-high-tension power transmission line Equipotential live working hanging basket method enters simulation system and method |
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| US4478312A (en) * | 1982-09-30 | 1984-10-23 | Kurtgis Michael P | System and portable cage for servicing power transmission lines |
| KR20080024852A (en) * | 2006-09-15 | 2008-03-19 | 한국전기공사협회 | Live-line changing method of the damaged spacer damper for 765kv double circuit transmission lines |
| KR20080044012A (en) * | 2006-11-15 | 2008-05-20 | 한국전기공사협회 | Barehand method to live line for 765kv double circuit transmission lines using a helicopter |
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