CN114689005B - Icing monitoring method under uneven icing working condition - Google Patents
Icing monitoring method under uneven icing working condition Download PDFInfo
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- CN114689005B CN114689005B CN202210489310.9A CN202210489310A CN114689005B CN 114689005 B CN114689005 B CN 114689005B CN 202210489310 A CN202210489310 A CN 202210489310A CN 114689005 B CN114689005 B CN 114689005B
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Abstract
The embodiment of the application provides an icing monitoring method under the working condition of uneven icing, which comprises the following steps: collecting tension F of insulator string of the middle tower 1 And insulator string inclination angle θ; collecting the wire inclination angle beta of the B point 2 (ii) a Collecting the inclination angle beta of the conductor at the point C 3 (ii) a Collecting the inclination angle beta of the wire at the D point 4 (ii) a Calculating the axial tension F2, the horizontal tension F11 and the vertical tension F12 of the point B; calculating the horizontal tension F31 and the vertical tension F32 of the point D; calculating the total vertical load F in the icing thickness value monitoring gear; according to the inclined span L of the icing thickness monitoring gear and the total vertical load F in the icing thickness monitoring gear; calculating the total average specific load gamma in the icing thickness value monitoring gear; and calculating the equivalent ice coating thickness value b in the ice coating thickness value monitoring file. The method can realize the equivalent icing thickness value in the icing thickness value monitoring file under the uneven icing working condition.
Description
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of monitoring of ice coating of power transmission lines, in particular to an ice coating monitoring method under the condition of uneven ice coating.
[ background of the invention ]
Monitoring of equivalent icing thickness of the wire is the key for judging icing damage degree and starting ice melting. The existing icing monitoring modes (including a tension method and an inclination angle method) are all established on the premise of load uniform distribution, and the reason is that the stress, the specific load and the vertical span can be calculated by using a wire state equation only under the condition of uniformly distributing the load. However, when the working condition of uneven icing exists in the monitoring area, the existing tension method and inclination angle method can cause larger errors of the calculation result due to the uneven icing; because the theoretical basis relied on when the existing wire state equation is deduced is no longer established when the working condition of uneven icing is carried out, the parameters of wire stress, specific load, equivalent icing thickness and the like deduced according to the theoretical basis are no longer accurate.
[ summary of the invention ]
In view of this, the embodiment of the present application provides an icing monitoring method under an uneven icing condition, which can monitor an equivalent icing thickness value of a conductor in a monitoring gear under the uneven icing condition.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a method for monitoring icing under the working condition of uneven icing is suitable for a power transmission line system, wherein the power transmission line system comprises a first tower, a second tower and a middle tower, a first lead is erected between the first tower and the middle tower, and a second lead is erected between the middle tower and the second tower;
the icing monitoring method comprises the following steps:
collecting tension F of insulator string of the middle tower 1 And insulator string inclination angle θ;
collecting the conductor of the first conductor at the side hanging point of the middle towerAngle of inclination of line beta 2 Defining the first lead positioned at the side hanging point of the middle tower as a point B;
collecting the inclination angle beta of the second lead at the side hanging point of the middle tower 3 Positioning the second lead at the side hanging point of the middle tower as a point C;
collecting the wire inclination angle beta of the first wire at the side hanging point of the first tower 4 Defining the position of the first lead at the side hanging point of the first tower as a point D;
according to the tension F of the insulator string 1 And the inclination angle theta of the insulator string and the inclination angle beta of the conducting wire 2 Angle of inclination of wire beta 3 Calculating the axial tension F2, the horizontal tension F11 and the vertical tension F12 of the point B;
according to the wire inclination angle beta 4 Axial tension F2 at point B and lead inclination angle beta 2 Calculating the horizontal tension F31 and the vertical tension F32 of the point D by the horizontal tension F11;
calculating the total vertical load F in the icing thickness value monitoring gear according to the vertical tension F12 and the vertical tension F32;
calculating a total average specific load gamma in the icing thickness value monitoring gear according to the inclined span L of the icing thickness monitoring gear and the total vertical load F in the icing thickness monitoring gear;
and calculating the equivalent ice coating thickness value b in the ice coating thickness value monitoring file according to the total average specific load gamma in the ice coating thickness value monitoring file, the weight m0 of the lead in unit length, the sectional area S of the lead and the outer diameter d of the lead.
In one embodiment, the tension F of the insulator string of the intermediate tower 1 And the inclination angle theta of the insulator string is measured by an insulator string tension and inclination angle sensor, and the insulator string tension and inclination angle sensor is arranged on the insulator string of the middle tower.
In one embodiment, the wire tilt angle β 2 The second wire inclination angle sensor is arranged on the first wire and at a distance of 0.5-2m from the insulator string of the middle tower;
the wire inclination angle beta 3 The third lead inclination angle sensor is arranged on the second lead at a distance of 0.5-2m from the insulator string of the middle tower;
the wire inclination angle beta 4 And measuring by a fourth lead inclination angle sensor, wherein the fourth lead inclination angle sensor is arranged on the first lead at a distance of 0.5-2m from the insulator string of the first tower.
In one embodiment, the axial tension F2, the horizontal tension F11 and the vertical tension F12 at the point B are calculated by:
firstly, calculating the axial tension F2 at the point B and the axial tension F3 at the point C through the formulas (1) and (2):
F 1 ×cosθ＝F 2 ×sinβ 2 +F 3 ×sinβ 3 ------(1)
F 1 ×sinθ＝F 2 ×cosβ 2 -F 3 ×cosβ 3 ------(2)
and further calculating the horizontal tension F11 and the vertical tension F12 of the point B by the formulas (3) and (4) according to the axial tension F2:
horizontal tension F11= F at point B 2 ×cosβ 2 ------(3)
Vertical tension F12= F at point B 2 ×sinβ 2 ------(4)。
In one embodiment, the step of calculating the ice accretion thickness value to monitor the total vertical load F in the gear comprises the steps of:
calculating the vertical tension F32 at the point D according to the formula (5):
F32＝tanβ 4 ×F 2 ×cosβ 2 ------(5)；
and summing the vertical tension F12 at the point B and the vertical tension F32 at the point D to obtain the total vertical load F in the icing thickness value monitoring gear.
In one embodiment, the calculated ice coating thickness value is obtained by calculating the total average specific load γ in the monitoring gear according to the formula (6):
γ＝F÷L------(6)。
in one embodiment, the calculated equivalent ice thickness value b in the ice coating thickness value monitoring file is calculated according to formula (7):
wherein m is 0 The weight of the wire per unit length is expressed, S represents the cross section area of the wire, d represents the outer diameter of the wire, and b represents the equivalent ice coating thickness value.
According to the ice coating monitoring method under the uneven ice coating working condition, the tension F of the insulator string of the middle tower is collected 1 And the inclination angle theta and B of the insulator string 2 C-point wire tilt angle beta 3 D wire inclination angle beta 4 And then calculating the axial tension F2, the horizontal tension F11 and the vertical tension F12 at the point B, the horizontal tension F31 and the vertical tension F32 at the point D according to the inclination angle values and the tension of the insulator string, further calculating the total vertical load F in the ice coating thickness value monitoring gear and the total average specific load gamma in the ice coating thickness value monitoring gear, and finally calculating the equivalent ice coating thickness value B in the ice coating thickness value monitoring gear, so that the equivalent ice coating thickness value under the working condition of uneven ice coating is obtained, the state of the power transmission line is favorably known, and the safety of the power transmission line is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power transmission line system and arrangement of monitoring sensors according to an embodiment of the present disclosure;
FIG. 2 is a stress analysis diagram of an ice coating monitoring tower line system under a non-uniform ice coating condition according to an embodiment of the present application;
FIG. 3 is a flowchart of an icing monitoring method under uneven icing conditions according to an embodiment of the present disclosure.
[ detailed description ] A
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be understood that the term "and/or" as used herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship. In the following description, the appearances of the terms "inner", "outer", "upper", "lower", "left", "right", and the like, indicating an orientation or positional relationship, are only for convenience in describing the embodiments and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the application.
The icing of the transmission line is a common phenomenon, so that a new method suitable for the uneven icing working condition is provided on the basis of the traditional icing monitoring mode, a lead state equation with even icing is thoroughly avoided, the icing monitoring result is unrelated to the icing uniformity, and the aim of accurately monitoring the equivalent icing thickness under the uneven icing working condition is fulfilled, namely, the icing monitoring method of the transmission line system under the uneven icing working condition is realized.
Based on this, the embodiment of the application provides an icing monitoring method under the condition of uneven icing, which is suitable for a power transmission line system, and as shown in fig. 1, the power transmission line system comprises a first tower M1, a second tower M2 and a middle tower M; a first conducting wire L1 is erected between the first tower M1 and the middle tower M, and a second conducting wire L2 is erected between the middle tower M and the second tower M2.
As shown in FIG. 3, the ice coating monitoring method under the uneven ice coating condition comprises the following steps:
step S1: collecting tension F of insulator string of the middle tower 1 An inclination angle theta of the insulator string and an inclination angle beta of the lead wire 2 、β 3 、β 4 (ii) a Specifically, the inclination angle beta of the first lead L1 at the side hanging point of the middle tower M is collected 2 (ii) a As shown in fig. 1, a point B is defined as a point where the first lead L1 is located at the side hanging point of the middle tower M;
collecting the wire inclination angle beta of a second wire L2 at the side hanging point of a middle tower M 3 As shown in fig. 1, a second lead L2 located at the side hanging point of the middle tower M is positioned as a point C;
collecting the wire inclination angle beta of a first wire L1 at the side hanging point of a first tower M1 4 And defining the position of the first lead L1 at the side hanging point of the first tower M1 as a point D.
In order to realize the collection of the parameters, the tension F of the insulator string of the middle tower 1 And the inclination angle theta of the insulator string is measured by an insulator string tension and inclination angle sensor S1, and specifically, the insulator string tension and inclination angle sensors are arranged on the insulator strings of two adjacent towers in the span and in the middle of the tower (point A). And respectively arranging a wire inclination angle sensor (points B and C) at the wire hanging points on the two sides of the middle tower, and arranging a wire inclination angle sensor (point D) at the other wire hanging point of the icing thickness value monitoring gear. In this embodiment, an icing thickness value monitoring gear is arranged between the first tower M1 and the middle tower M, that is, the first lead L1 is a lead segment for which the icing thickness needs to be monitored.
More specifically, as shown in FIG. 1, the wire is inclined at an angle β 2 Measured by a second wire inclination sensor S2, the second wire inclination sensorS2 is arranged on the first lead L1 and is at a distance (0.5-2) M from the insulator string of the middle tower M, namely the distance between the second lead inclination angle sensor S2 and the hanging point of the middle tower M side of the first lead L1 is (0.5-2) M, and the preferred distance is 1M.
Wire inclination angle beta 3 The third lead inclination angle sensor S3 is used for measuring, the third lead inclination angle sensor S3 is arranged on the second lead L2 and is at a distance (0.5-2) M away from the insulator string of the middle tower M, namely the distance between the third lead inclination angle sensor S3 and the hanging point of the middle tower M side of the second lead L2 is (0.5-2) M, and the distance is preferably 1M.
Wire inclination angle beta 4 The fourth lead inclination angle sensor S4 measures that the fourth lead inclination angle sensor S4 is disposed on the first lead L1 at a distance (0.5-2) M from the insulator string of the first tower M1, that is, the distance between the fourth lead inclination angle sensor S4 and the hanging point of the first lead L1 on the first tower M1 side is (0.5-2) M, and is preferably 1 meter.
After the tension and inclination angle sensors S1 of the insulator string and the inclination angle sensors of the wires monitor the data, the step S2 is executed:
step S2: calculating the axial tension F2, the horizontal tension F11 and the vertical tension F12 of the point B; in particular, according to the tension F of the insulator string 1 And the inclination angle theta of the insulator string and the inclination angle beta of the conducting wire 2 Angle of inclination of wire beta 3 And calculating the axial tension F2, the horizontal tension F11 and the vertical tension F12 of the point B. The relative tension at point B can be represented by the relative force at position B where the second wire inclination sensor S2 is located.
And step S3: the horizontal tension F31 and the vertical tension F32 at point D are calculated. Specifically, according to the wire inclination angle beta 4 Axial tension F2 at point B and lead inclination angle beta 2 And horizontal tension F11 calculates horizontal tension F31 and vertical tension F32 at point D. The horizontal tension F31 and the vertical tension F32 at point D can be represented by the relative stress at the position D of the fourth wire inclination angle sensor S4.
And step S4: and calculating the total vertical load F in the icing thickness value monitoring gear. Specifically, the total vertical load F in the icing thickness monitoring gear is calculated according to the vertical tension F12 at the point B and the vertical tension F31 at the point D.
Step S5: and calculating the total average specific load gamma in the ice coating thickness value monitoring gear. Specifically, the total average specific load gamma in the icing thickness value monitoring gear is calculated according to the inclined span L of the icing thickness monitoring gear and the total vertical load F in the icing thickness monitoring gear.
Step S6: and calculating an equivalent icing thickness value b in the icing thickness value monitoring file. Specifically, the equivalent ice coating thickness value b in the ice coating thickness value monitoring file is calculated according to the total average specific load gamma in the ice coating thickness value monitoring file, the unit length weight m0 of the lead, the cross section area S of the lead and the outer diameter d of the lead.
In one embodiment, as shown in fig. 2, according to the force analysis of the point M, there is a functional relationship among the insulator string tension (F1), the insulator string inclination angle (θ), the wire inclination angle (β 2) at the point B, the wire inclination angle (β 3) at the point C, the axial tension (F2) at the point B, and the axial tension (F3) at the point C, and therefore, the method for calculating the horizontal tension and the vertical tension at the point B is as follows:
simultaneous equations (1) and (2),
F 1 ×cosθ＝F 2 ×sinβ 2 +F 3 ×sinβ 3 ------(1)
F 1 ×sinθ＝F 2 ×cosβ 2 -F 3 ×cosβ 3 ------(2)
in the formula, F 2 Axial tension at point B, F 3 The axial tension of the point C is represented, and the others are all monitoring quantities, namely known quantities;
calculating simultaneous equations (1) and (2) to obtain axial tension F at point B 2 And axial tension F at point C 3 ；
And calculating the horizontal tension F11 and the vertical tension F12 of the point B by the formulas (3) and (4) according to the axial tension F2 of the point B: in particular, the method comprises the following steps of,
horizontal tension at point B: f11= F 2 ×cosβ 2 ------(3)
Vertical tension at point B: f12= F 2 ×sinβ 2 ------(4)。
Further, as can be seen from the principle of static equilibrium, the horizontal tension at each point is the same in the same span and is independent of the uniformity of the load, so the horizontal tension at point D = the horizontal tension at point B. Further, the vertical tension F32 at point D can be calculated according to equation (5):
F32＝tanβ 4 ×F 2 ×cosβ 2 ------(5)。
in the embodiment, step S4 of calculating the ice accretion thickness value and monitoring the total vertical load F in the gear includes the following steps:
according to the statics basic principle, the total vertical load in the span is the sum of the vertical tensions at the hanging points of the two conducting wires, and the vertical tension of the ice coating thickness value monitoring grade, wherein the vertical tension of the ice coating thickness value monitoring grade is F = B + D, namely the vertical tension of the B point is F12 and the vertical tension of the D point is F32, and the sum is obtained to obtain the total vertical load F in the ice coating thickness value monitoring grade.
Further, step S5 is to calculate the total average specific load γ in the ice coating thickness value monitoring gear according to the formula (6):
γ＝F÷L------(6)；
in the formula, gamma represents the total average specific load in the ice coating thickness value monitoring gear; f represents the total vertical load in the icing thickness value monitoring gear; and L represents the inclined gear span of the ice coating thickness value monitoring gear, and the inclined gear span is the known constant as the line basic data.
Further, step S6 is to calculate the equivalent ice coating thickness value b in the ice coating thickness value monitoring file according to the formula (7):
wherein m is 0 The weight of the lead per unit length is represented, S represents the cross section area of the lead, d represents the outer diameter of the lead, the three items are basic data of the line, namely known constants, and b represents the equivalent ice coating thickness value. ,
in the above embodiment, a wire of a certain type JLHA1/G1A-400/95 is used as a wire to be tested, and line basic data, that is, a known constant, is obtained: the inclined pitch is 550 (m), the weight per unit length of the lead is 33.86 (N/m), and the cross-sectional area of the lead is 275.75 (mm) 2 ) And the outer diameter of the wire is 39.5 (mm).
The sensor acquires the monitoring quantity, namely the known quantity: the tension F1=270 (kg) of the insulator string, the inclination angle theta =3.09 (°) of the insulator string, and the inclination angle beta of the lead at the point B 2 C point wire tilt angle beta of 10.36 (°) 3 =10.31 (°), and the lead inclination angle beta at point D 4 ＝10.22(°)。
Through the calculation model in the above embodiment, the equivalent ice coating thickness value =52.74 (mm) in the ice coating thickness value monitoring gear is calculated.
In the description of the specification, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (6)
1. The icing monitoring method under the uneven icing working condition is characterized by being suitable for a power transmission line system, wherein the power transmission line system comprises a first tower, a second tower and a middle tower, a first lead is erected between the first tower and the middle tower, and a second lead is erected between the middle tower and the second tower;
the icing monitoring method comprises the following steps:
collecting tension F of insulator string of the middle tower 1 And insulator string inclination angle θ;
collecting the wire inclination angle beta of the first wire at the side hanging point of the middle tower 2 Defining the first lead at the side hanging point of the middle tower as a point B;
collecting the inclination angle beta of the second wire at the side hanging point of the middle tower 3 Positioning the second lead at the side hanging point of the middle tower as a point C;
collecting the wire inclination angle beta of the first wire at the side hanging point of the first tower 4 Defining the position of the first lead at the side hanging point of the first tower as a point D;
according to the tension F of the insulator string 1 And the inclination angle theta of the insulator string and the inclination angle beta of the conducting wire 2 Angle of inclination of wire beta 3 Calculating the axial tension F2, the horizontal tension F11 and the vertical tension F12 of the point B;
according to the wire inclination angle beta 4 Axial tension F2 at point B and lead inclination angle beta 2 And calculating the horizontal tension F31 and the vertical tension F32 of the point D by the horizontal tension F11;
calculating the total vertical load F in the icing thickness value monitoring gear according to the vertical tension F12 and the vertical tension F32;
calculating a total average specific load gamma in the icing thickness value monitoring gear according to the inclined span L of the icing thickness monitoring gear and the total vertical load F in the icing thickness monitoring gear;
calculating an equivalent ice coating thickness value b in the ice coating thickness value monitoring file according to the total average specific load gamma in the ice coating thickness value monitoring file, the weight m0 of the lead in unit length, the sectional area S of the lead and the outer diameter d of the lead by using a formula (7);
2. the method for monitoring ice coating under uneven ice coating conditions as claimed in claim 1, wherein the insulator string tension F of the intermediate tower 1 And the inclination angle theta of the insulator string is measured by an insulator string tension and inclination angle sensor, and the insulator string tension and inclination angle sensor is arranged on the insulator string of the middle tower.
3. The method of claim 2, wherein the lead angle β is greater than the lead angle β 2 The second wire inclination angle sensor is arranged on the first wire and at a distance of 0.5-2m from the insulator string of the middle tower;
the wire inclination angle beta 3 The third lead inclination angle sensor is arranged on the second lead at a distance of 0.5-2m from the insulator string of the middle tower;
the wire inclination angle beta 4 And measuring by a fourth lead inclination angle sensor, wherein the fourth lead inclination angle sensor is arranged on the first lead at a distance of 0.5-2m from the insulator string of the first tower.
4. The method for monitoring ice coating under the uneven ice coating condition according to any one of claims 1 to 3, wherein the axial tension F2, the horizontal tension F11 and the vertical tension F12 at the point B are calculated by the following steps:
firstly, calculating the axial tension F2 at the point B and the axial tension F3 at the point C through the formulas (1) and (2):
F 1 ×cosθ＝F 2 ×sinβ 2 +F 3 ×sinβ 3 ------(1)
F 1 ×sinθ＝F 2 ×Cosβ 2 -F 3 ×cosβ 3 ------(2)
and further calculating the horizontal tension F11 and the vertical tension F12 of the point B by formulas (3) and (4) according to the axial tension F2:
horizontal tension F11= F at point B 2 ×Cosβ 2 ------(3)
Vertical tension at point B F12= F 2 ×sinβ 2 ------(4)。
5. The method for monitoring ice coating under the uneven ice coating working condition according to claim 4, wherein the step of calculating the ice coating thickness value to monitor the total vertical load F in the gear comprises the following steps of:
calculating the vertical tension F32 at the point D according to the formula (5):
F32＝tanβ 4 ×F 2 ×cosβ 2 ------(5)；
and summing the vertical tension F12 at the point B and the vertical tension F32 at the point D to obtain the total vertical load F in the ice coating thickness value monitoring gear.
6. The method for monitoring icing under uneven icing conditions according to claim 5, wherein the total average specific load γ in the monitoring gear is calculated according to the formula (6) by calculating the icing thickness value:
γ＝F÷L------(6)。
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