阅读说明：本技术 等档距输配电线路直线塔等值覆冰厚度测量方法及系统 (Equal-span transmission and distribution line tangent tower equivalent icing thickness measurement method and system ) 是由 黄增浩 李�昊 何锦强 赵林杰 廖永力 朱登杰 张志强 王斌 魏发生 牛唯 马晓 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种等档距输配电线路直线塔等值覆冰厚度测量方法及系统包括：根据无覆冰工况下的导线历史拉力数据,计算得到无覆冰工况下的导线水平张力；根据导线参数和导线电流有效值,建立导线状态方程；根据预设的验证覆冰厚度计算得到覆冰工况下的导线比载,将所述覆冰工况下的导线比载和所述无覆冰工况下的导线水平张力代入所述导线状态方程,得到覆冰工况下的导线水平张力；根据所述覆冰工况下的导线水平张力和所述覆冰工况下的导线比载,计算得到覆冰工况下的导线拉力计算值；基于拉力传感器监测到的拉力监测值和所述导线拉力计算值的比较结果,得到导线等值覆冰厚度。本发明能够减小覆冰厚度计算误差,提高输配电线路覆冰在线监测准确性。(The invention discloses a method and a system for measuring equivalent icing thickness of a tangent tower of a constant-span power transmission and distribution line, which comprises the following steps: according to historical tension data of the wire under the working condition without ice coating, calculating to obtain the horizontal tension of the wire under the working condition without ice coating; establishing a wire state equation according to the wire parameters and the wire current effective value; calculating according to a preset verification icing thickness to obtain a conductor specific load under an icing working condition, and substituting the conductor specific load under the icing working condition and the conductor horizontal tension under the non-icing working condition into the conductor state equation to obtain the conductor horizontal tension under the icing working condition; calculating to obtain a calculated value of the wire tension under the ice coating working condition according to the wire horizontal tension under the ice coating working condition and the wire specific load under the ice coating working condition; and obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire. The method can reduce the calculation error of the icing thickness and improve the icing on-line monitoring accuracy of the power transmission and distribution line.)

1. A method for measuring equivalent icing thickness of a tangent tower of a power transmission and distribution line with equal span is characterized by comprising the following steps:

according to historical tension data of the wire under the working condition without ice coating, calculating to obtain the horizontal tension of the wire under the working condition without ice coating;

establishing a wire state equation according to the wire parameters and the wire current effective value, wherein the wire current effective value is obtained through monitoring of a current transformer or the wire current effective value is obtained through a load curve;

calculating according to a preset verification icing thickness to obtain a conductor specific load under an icing working condition, and substituting the conductor specific load under the icing working condition and the conductor horizontal tension under the non-icing working condition into the conductor state equation to obtain the conductor horizontal tension under the icing working condition;

calculating to obtain a calculated value of the wire tension under the ice coating working condition according to the wire horizontal tension under the ice coating working condition and the wire specific load under the ice coating working condition;

and obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire.

2. The method for measuring equivalent ice coating thickness of the tangent tower of the equal-span power transmission and distribution line according to claim 1, wherein the step of calculating the horizontal tension of the wire under the ice-coating-free working condition according to the historical tension data of the wire under the ice-coating-free working condition comprises the following steps:

according to the historical tension data of the wire under the working condition without ice coating, calculating to obtain the tension of the wire under the working condition without ice coating;

and calculating the horizontal tension of the wire under the ice-coating-free working condition according to the following formula:

in the formula, F₀The tension of the wire under the working condition of no ice coating, wherein l is the span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₀The specific load of the wire under the working condition of no ice coating is adopted.

3. The method for measuring equivalent ice thickness of tangent towers of equal-span transmission and distribution lines as claimed in claim 1, wherein the equation of state of the transmission line is as follows:

wherein H₁The horizontal tension of the wire under the working condition of ice coating; alpha is the expansion coefficient of the lead; e is the elastic coefficient of the lead; omega₀The weight per unit length, omega, of the wire under the working condition of no ice coating₁The weight of the lead per unit length under the ice coating working condition; delta T₁The temperature difference of the lead caused by natural environment under the working condition of no ice coating and the working condition of ice coating; delta T₂The temperature difference of the lead caused by the current-carrying capacity change of the lead under the working condition of no ice coating and the working condition of ice coating.

4. The method for measuring equivalent ice coating thickness of tangent towers of equal-span transmission and distribution lines as claimed in claim 1, wherein the step of calculating the specific load of the conductor under the ice coating working condition according to the preset verified ice coating thickness comprises the following steps:

and calculating the specific load of the wire under the ice coating working condition according to the following formula:

γ₁＝γ₀+0.9πb(b+D)

in the formula, gamma₀The specific load of the wire under the working condition of no icing, b is the preset verification icing thickness, and D is the diameter of the wire.

5. The method for measuring equivalent icing thickness of the tangent tower of the equal-span transmission and distribution line according to claim 1, wherein the step of calculating a calculated value of the wire tension under the icing condition according to the horizontal tension of the wire under the icing condition and the specific load of the wire under the icing condition comprises the following steps:

and calculating a calculated value of the wire tension under the ice coating working condition according to the following formula:

in the formula, l is a span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₁The specific load of the wire under the ice coating working condition.

6. The method for measuring equivalent ice coating thickness of tangent towers of equal-span power transmission and distribution lines as claimed in claim 1, wherein the step of obtaining the equivalent ice coating thickness of the conducting wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the conducting wire comprises the following steps:

when the comparison result of the tension monitoring value and the calculated wire tension value is not greater than a preset error, judging the equivalent icing thickness of the wire to be the preset verification icing thickness;

when the tension monitoring value is smaller than the calculated wire tension value, the preset verification icing thickness is obtained again according to a first preset rule;

and when the tension monitoring value is larger than the calculated wire tension value, the preset verification icing thickness is obtained again according to a second preset rule.

7. The utility model provides a constant-span transmission and distribution line tangent tower equivalence icing thickness measurement system which characterized in that includes:

the first calculation module is used for calculating and obtaining the horizontal tension of the wire under the ice-coating-free working condition according to the historical tension data of the wire under the ice-coating-free working condition;

the system comprises a wire current monitoring module, a wire state equation establishing module and a wire state equation establishing module, wherein the wire current effective value is obtained through monitoring of a current transformer or through a load curve;

the solving module is used for calculating to obtain the specific load of the wire under the ice coating working condition according to the preset verification ice coating thickness, and substituting the specific load of the wire under the ice coating working condition and the horizontal tension of the wire under the ice coating-free working condition into the wire state equation to obtain the horizontal tension of the wire under the ice coating working condition;

the second calculation module is used for calculating to obtain a calculated value of the wire tension under the ice coating working condition according to the horizontal tension of the wire under the ice coating working condition and the specific load of the wire under the ice coating working condition;

and the third calculation module is used for obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire.

Technical Field

The invention relates to the field of ice coating on-line monitoring of power transmission and distribution lines, in particular to a method and a system for measuring equivalent ice coating thickness of a tangent tower of a power transmission and distribution line with equal span.

Background

Ice disasters seriously threaten the safe operation of a power grid, and the occurrence of extremely cold weather causes frequent ice coating events on a large area of a power transmission line, so that accidents such as disconnection, tower collapse, insulator flashover and the like of the power transmission line occur, and huge economic and property losses are caused to the power grid. Therefore, the ice coating on-line monitoring is an important ring for the anti-icing and anti-icing work of the power grid. In the prior art, a weighing method is widely applied to calculating the icing thickness of a linear tower, but the icing thickness calculated by the method has larger error, so that the accuracy of online icing monitoring is poor.

Disclosure of Invention

The invention provides a method and a system for measuring equivalent icing thickness of a tangent tower of an equal-span power transmission and distribution line, which aim to solve the problem that an icing thickness calculation method in the prior art has larger error.

The embodiment of the invention provides a method for measuring equivalent icing thickness of a tangent tower of a transmission and distribution line with equal span, which comprises the following steps:

according to historical tension data of the wire under the working condition without ice coating, calculating to obtain the horizontal tension of the wire under the working condition without ice coating;

establishing a wire state equation according to the wire parameters and the wire current effective value, wherein the wire current effective value is obtained through monitoring of a current transformer or the wire current effective value is obtained through a load curve;

calculating according to a preset verification icing thickness to obtain a conductor specific load under an icing working condition, and substituting the conductor specific load under the icing working condition and the conductor horizontal tension under the non-icing working condition into the conductor state equation to obtain the conductor horizontal tension under the icing working condition;

calculating to obtain a calculated value of the wire tension under the ice coating working condition according to the wire horizontal tension under the ice coating working condition and the wire specific load under the ice coating working condition;

and obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire.

Further, the calculating to obtain the horizontal tension of the wire under the ice-coating-free working condition according to the historical tension data of the wire under the ice-coating-free working condition includes:

according to the historical tension data of the wire under the working condition without ice coating, calculating to obtain the tension of the wire under the working condition without ice coating;

and calculating the horizontal tension of the wire under the ice-coating-free working condition according to the following formula:

in the formula, F₀The tension of the wire under the working condition of no ice coating, wherein l is the span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₀The specific load of the wire under the working condition of no ice coating is adopted.

Further, the transmission line state equation is:

wherein H₁The horizontal tension of the wire under the working condition of ice coating; alpha is the expansion coefficient of the lead; e is the elastic coefficient of the lead; omega₀The weight per unit length, omega, of the wire under the working condition of no ice coating₁The weight of the lead per unit length under the ice coating working condition; delta T₁The temperature difference of the lead caused by natural environment under the working condition of no ice coating and the working condition of ice coating; delta T₂The temperature difference of the lead caused by the current-carrying capacity change of the lead under the working condition of no ice coating and the working condition of ice coating.

Further, the calculating the wire specific load under the icing working condition according to the preset verification icing thickness comprises:

and calculating the specific load of the wire under the ice coating working condition according to the following formula:

γ₁＝γ₀+0.9πb(b+D)

in the formula, gamma₀The specific load of the wire under the working condition of no icing, b is the preset verification icing thickness, and D is the diameter of the wire.

Further, the calculating of the wire tension under the ice coating condition according to the horizontal tension of the wire under the ice coating condition and the wire specific load under the ice coating condition includes:

and calculating a calculated value of the wire tension under the ice coating working condition according to the following formula:

in the formula, l is a span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₁The specific load of the wire under the ice coating working condition.

Further, the obtaining of the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire comprises:

when the comparison result of the tension monitoring value and the calculated wire tension value is not greater than a preset error, judging the equivalent icing thickness of the wire to be the preset verification icing thickness;

when the tension monitoring value is smaller than the calculated wire tension value, the preset verification icing thickness is obtained again according to a first preset rule;

and when the tension monitoring value is larger than the calculated wire tension value, the preset verification icing thickness is obtained again according to a second preset rule.

Correspondingly, the embodiment of the invention also provides a system for measuring equivalent icing thickness of a tangent tower of a constant-span power transmission and distribution line, which comprises the following components:

the first calculation module is used for calculating and obtaining the horizontal tension of the wire under the ice-coating-free working condition according to the historical tension data of the wire under the ice-coating-free working condition;

the system comprises a wire current monitoring module, a wire state equation establishing module and a wire state equation establishing module, wherein the wire current effective value is obtained through monitoring of a current transformer or through a load curve;

the solving module is used for calculating to obtain the specific load of the wire under the ice coating working condition according to the preset verification ice coating thickness, and substituting the specific load of the wire under the ice coating working condition and the horizontal tension of the wire under the ice coating-free working condition into the wire state equation to obtain the horizontal tension of the wire under the ice coating working condition;

the second calculation module is used for calculating to obtain a calculated value of the wire tension under the ice coating working condition according to the horizontal tension of the wire under the ice coating working condition and the specific load of the wire under the ice coating working condition;

and the third calculation module is used for obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire.

Compared with the prior art, the equivalent ice coating thickness measuring method and system for the tangent tower of the equal-span power transmission and distribution line provided by the embodiment of the invention calculate the horizontal tension of the wire under the ice coating-free working condition through the historical tension data of the wire under the ice coating-free working condition; then establishing a lead state equation according to the lead parameters and the lead current effective value, and solving the lead state equation to obtain the horizontal tension of the lead under the ice-coated working condition; calculating to obtain a wire tension calculated value under the ice coating working condition according to the wire horizontal tension under the ice coating working condition and the wire specific load under the ice coating working condition; and finally, obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire. According to the embodiment of the invention, the equivalent icing thickness is obtained by establishing the state equation of the lead in consideration of the running current of the lead, so that the error caused by the change of the vertical span during icing can be greatly reduced, and the accuracy of the online monitoring of the icing of the equal-span power transmission and distribution line is improved.

Drawings

FIG. 1 is a schematic flow chart of a method for measuring equivalent ice coating thickness of a tangent tower of a transmission and distribution line with equal span according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a system for measuring equivalent ice coating thickness of a tangent tower of a transmission and distribution line with equal span according to an embodiment of the invention;

fig. 3 is a schematic view of a tangent tower model in an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

Referring to fig. 1, a schematic flow chart of a method for measuring equivalent ice thickness of a tangent tower of a constant-pitch power transmission and distribution line provided by an embodiment of the present invention includes:

s11, calculating to obtain the horizontal tension of the wire under the ice-coating-free working condition according to the historical tension data of the wire under the ice-coating-free working condition;

s12, establishing a lead state equation according to the lead parameters and the lead current effective value, wherein the lead current effective value is obtained through monitoring of a current transformer or the lead current effective value is obtained through a load curve;

specifically, the wire parameters include the wire model, the elastic coefficient E corresponding to the wire in the design data of the circuit, the wire expansion coefficient alpha, the wire cross-sectional area S, and the wire specific load gamma₀The gear distance l, the height difference h of each gear, the weight M of the insulator string and the hardware fitting, and the line design meteorological conditions.

S13, calculating to obtain the specific load of the wire under the ice coating working condition according to the preset verification ice coating thickness, and substituting the specific load of the wire under the ice coating working condition and the horizontal tension of the wire under the ice coating-free working condition into the wire state equation to obtain the horizontal tension of the wire under the ice coating working condition;

specifically, the specific load of the wire under the ice-coating working condition and the horizontal tension of the wire under the ice-coating-free working condition are substituted into the wire state equation, and the wire state equation is solved by an iterative method to obtain the horizontal tension of the wire under the ice-coating working condition;

s14, calculating to obtain a wire tension calculation value under the ice coating working condition according to the horizontal tension of the wire under the ice coating working condition and the wire specific load under the ice coating working condition;

and S15, obtaining the equivalent ice coating thickness of the lead based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the lead.

In the prior art, the vertical span is usually used as a fixed value, and the change characteristic of the vertical span during ice coating is ignored, so that the calculated ice coating thickness error is larger.

As an improvement of the above scheme, the calculating to obtain the horizontal tension of the wire under the ice-coating-free working condition according to the historical tension data of the wire under the ice-coating-free working condition includes:

according to the historical tension data of the wire under the working condition without ice coating, calculating to obtain the tension of the wire under the working condition without ice coating;

and calculating the horizontal tension of the wire under the ice-coating-free working condition according to the following formula:

in the formula, F₀The tension of the wire under the working condition of no ice coating, wherein l is the span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₀The specific load of the wire under the working condition of no ice coating is adopted.

It should be noted that, referring to fig. 3, historical tension data under the ice-coating-free working condition is obtained according to the ice-coating online monitoring terminal, and the average value of the historical tension data is obtained, so that the tension of the wire under the ice-coating-free working condition can be obtained:

in the formula, F_iThe tension data is tension data under the ice-coating-free working condition monitored by the ice-coating online monitoring terminal, and N is the number of the monitoring data. Understandably, when the tension data under the ice-coating-free working condition monitored by the ice-coating online monitoring terminal within one year is extracted, F₀The wire tension is the wire tension under the working condition of no ice coating on average in the year.

According to a calculation formula of the monitoring value of the tension sensor under the working condition without ice coating:

in the formula, F₀The tension of the wire under the working condition of no ice coating, wherein l is the span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₀Specific load of wire under ice-coating-free working condition, H₀The horizontal tension of the lead under the working condition of no ice coating;

obtaining the horizontal tension of the wire under the working condition of no ice coating:

in the formula, F₀The tension of the wire under the working condition of no ice coating, wherein l is the span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₀Is not covered with iceMoreover, the wire is loaded.

As an improvement of the above scheme, the transmission line state equation is:

wherein H₁The horizontal tension of the wire under the working condition of ice coating; alpha is the expansion coefficient of the lead; e is the elastic coefficient of the lead; omega₀The weight per unit length, omega, of the wire under the working condition of no ice coating₁The weight of the lead per unit length under the ice coating working condition; delta T₁The temperature difference of the lead caused by natural environment under the working condition of no ice coating and the working condition of ice coating; delta T₂The temperature difference of the lead caused by the current-carrying capacity change of the lead under the working condition of no ice coating and the working condition of ice coating.

It can be understood that, considering the equal span, the line path generally has small fluctuation, the general value of the height difference angle represented by the whole strain section line is small, approximately, the height difference angle represented by the line is 0 degree, and then a simplified wire state equation considering the wire running current is established:

wherein H₁The horizontal tension of the wire under the working condition of ice coating; alpha is the expansion coefficient of the lead; e is the elastic coefficient of the lead; omega₀The weight per unit length, omega, of the wire under the working condition of no ice coating₁The weight of the lead per unit length under the ice coating working condition; delta T₁The temperature difference of the lead caused by natural environment under the working condition of no ice coating and the working condition of ice coating; delta T₂The temperature difference of the lead caused by the current-carrying capacity change of the lead under the working condition of no ice coating and the working condition of ice coating.

Specifically, the weight per unit length of the wire under the ice-coating-free working condition is as follows:

ω₀＝S*γ₀

wherein S is the sectional area of the wire; gamma ray₀The specific load of the wire under the working condition of no ice coating;

the conductor under the ice coating working condition has the following weight per unit length:

ω₁＝S*γ₁

wherein S is the sectional area of the wire; gamma ray₁The specific load of the wire under the working condition of no ice coating;

the temperature difference of the lead caused by the natural environment under the working condition of no ice coating and the working condition of ice coating is as follows:

ΔT₁＝t₀-t₁

in the formula, t₀Is the temperature of the wire under the working condition of no ice coating, t₁The temperature of the wire under the ice coating working condition can be taken according to the line design meteorological conditions;

the temperature difference caused by the current-carrying capacity change of the lead under the two working conditions of the ice-coating-free working condition and the ice-coating working condition is as follows:

ΔT₂＝μ×R×ΔI²

in the formula, R is a line resistance, Δ I is a difference between an effective Current value under a non-icing working condition and an effective Current value under an icing working condition, Δ I can be calculated according to a real-time monitoring value of a line CT (Current Transformer), or can be calculated simply according to a line load curve rule, a fixed value is taken, μ is a correction coefficient, and correction is performed according to actual conditions such as an ambient wind speed.

As an improvement of the above scheme, the calculating the wire specific load under the icing condition according to the preset verification icing thickness includes:

and calculating the specific load of the wire under the ice coating working condition according to the following formula:

γ₁＝γ₀+0.9πb(b+D)

in the formula, gamma₀The specific load of the wire under the working condition of no icing, b is the preset verification icing thickness, and D is the diameter of the wire.

As an improvement of the above scheme, the calculating a wire tension value under the ice coating condition by calculation according to the wire horizontal tension under the ice coating condition and the wire specific load under the ice coating condition includes:

and calculating a calculated value of the wire tension under the ice coating working condition according to the following formula:

in the formula, l is a span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₁The specific load of the wire under the ice coating working condition.

As an improvement of the above scheme, the obtaining of the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire includes:

when the comparison result of the tension monitoring value and the calculated wire tension value is not greater than a preset error, judging the equivalent icing thickness of the wire to be the preset verification icing thickness;

when the tension monitoring value is smaller than the calculated wire tension value, the preset verification icing thickness is obtained again according to a first preset rule;

and when the tension monitoring value is larger than the calculated wire tension value, the preset verification icing thickness is obtained again according to a second preset rule.

Specifically, in connection with the above embodiment, assuming that the preset verified ice coating thickness b is b0, τ is a preset error allowed by the calculation;

a tension monitoring value F monitored by the tension sensor_miAnd the calculated value of the wire tension F₁And (3) comparison:

if the comparison result of the tension monitoring value and the calculated wire tension value is not more than a preset error, namely | F₁-F_miWhen | < tau, the equivalent ice coating thickness of the lead is b₀；

F is obtained when the tension monitoring value is smaller than the calculated wire tension value_mi＜F₁Then, a dichotomy is adopted, assuming that b is b₀/2、b₀/4、3b₀The method returns to the step S13 to be recalculated until | F₁-F_miLess than or equal to tau to obtain transmission and distributionEquivalent icing thickness of the electric line;

f is obtained when the tension monitoring value is larger than the calculated wire tension value_mi＞F₁When, assume that b is 2b₀、4b₀、6b₀..., return to step S13 to recalculate until | F₁-F_miAnd (5) the I is less than or equal to tau, and the equivalent ice coating thickness of the power transmission and distribution line is obtained.

Referring to fig. 2, a schematic structural diagram of an equivalent ice thickness measurement system of a tangent tower of a constant-pitch power transmission and distribution line provided in an embodiment of the present invention includes:

the first calculation module 21 is configured to calculate a horizontal tension of the wire under the ice-coating-free working condition according to historical tension data of the wire under the ice-coating-free working condition;

the system comprises a lead parameter establishing module 22, a lead current effective value establishing module, a lead state equation establishing module and a load curve establishing module, wherein the lead current effective value is obtained through monitoring of a current transformer or a load curve;

the solving module 23 is configured to calculate a conductor specific load under an icing condition according to a preset verified icing thickness, and substitute the conductor specific load under the icing condition and the conductor horizontal tension under the non-icing condition into the conductor state equation to obtain the conductor horizontal tension under the icing condition;

the second calculation module 24 is configured to calculate a calculated value of a wire tension under the ice coating condition according to the wire horizontal tension under the ice coating condition and the wire specific load under the ice coating condition;

and the third calculating module 25 is used for obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire.

Preferably, the first calculation module includes:

the wire tension calculating unit is used for calculating and obtaining the wire tension under the ice-coating-free working condition according to the historical wire tension data under the ice-coating-free working condition;

and the wire horizontal tension calculating unit is used for calculating and obtaining the wire horizontal tension under the ice-coating-free working condition according to the following formula:

in the formula, F₀The tension of the wire under the working condition of no ice coating, wherein l is the span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₀The specific load of the wire under the working condition of no ice coating is adopted.

Preferably, the transmission line state equation is:

wherein H₁The horizontal tension of the wire under the working condition of ice coating; alpha is the expansion coefficient of the lead; e is the elastic coefficient of the lead; omega₀The weight per unit length, omega, of the wire under the working condition of no ice coating₁The weight of the lead per unit length under the ice coating working condition; delta T₁The temperature difference of the lead caused by natural environment under the working condition of no ice coating and the working condition of ice coating; delta T₂The temperature difference of the lead caused by the current-carrying capacity change of the lead under the working condition of no ice coating and the working condition of ice coating.

Preferably, the solving module is further configured to:

and calculating the specific load of the wire under the ice coating working condition according to the following formula:

γ₁＝γ₀+0.9πb(b+D)

in the formula, gamma₀The specific load of the wire under the working condition of no icing, b is the preset verification icing thickness, and D is the diameter of the wire.

Preferably, the second calculation module is further configured to:

and calculating a calculated value of the wire tension under the ice coating working condition according to the following formula:

in the formula, l is a span; h is₁、h₂Is the height difference between suspension points at two sides of the tower, and when the suspension point of the tower is higher than the adjacent tower, h₁、h₂Positive, otherwise negative; s is the sectional area of the wire; m is the weight of the insulator string and the hardware fitting; gamma ray₁The specific load of the wire under the ice coating working condition.

Preferably, the third calculation module is further configured to:

when the comparison result of the tension monitoring value and the calculated wire tension value is not greater than a preset error, judging the equivalent icing thickness of the wire to be the preset verification icing thickness;

when the tension monitoring value is smaller than the calculated wire tension value, the preset verification icing thickness is obtained again according to a first preset rule;

and when the tension monitoring value is larger than the calculated wire tension value, the preset verification icing thickness is obtained again according to a second preset rule.

It should be noted that, the system for measuring equivalent ice thickness of a tangent tower of an equal-span power transmission and distribution line provided by the embodiment of the present invention can implement all processes of the method for measuring equivalent ice thickness of a tangent tower of an equal-span power transmission and distribution line described in any one of the embodiments, and the functions and implemented technical effects of each unit and sub-unit in the system are respectively the same as those of the method for measuring equivalent ice thickness of a tangent tower of an equal-span power transmission and distribution line described in the embodiments, and are not described herein again.

According to the method and the system for measuring the equivalent icing thickness of the tangent tower of the equal-span power transmission and distribution line, provided by the embodiment of the invention, the horizontal tension of the wire under the ice-coating-free working condition is calculated through the historical tension data of the wire under the ice-coating-free working condition; then establishing a lead state equation according to the lead parameters and the lead current effective value, and solving the lead state equation to obtain the horizontal tension of the lead under the ice-coated working condition; calculating to obtain a wire tension calculated value under the ice coating working condition according to the wire horizontal tension under the ice coating working condition and the wire specific load under the ice coating working condition; and finally, obtaining the equivalent ice coating thickness of the wire based on the comparison result of the tension monitoring value monitored by the tension sensor and the calculated value of the tension of the wire. According to the embodiment of the invention, the equivalent icing thickness is obtained by establishing the state equation of the lead in consideration of the running current of the lead, so that the error caused by the change of the vertical span during icing can be greatly reduced, and the accuracy of the online monitoring of the icing of the equal-span power transmission and distribution line is improved.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.