CN115184739B - Traveling wave distance measurement method and system considering comprehensive parameter change - Google Patents

Abstract

The invention discloses a traveling wave distance measurement method and a traveling wave distance measurement system considering comprehensive parameter changes. Wherein, the method comprises the following steps: decomposing line parameters, performing sub-packet calculation on the full length of the line, and determining each sub-packet segmented line; calculating a line length correction value and a line length correction coefficient according to the actual line length of each sub-packet segmented line; determining wave velocity correction values at two ends of double-end distance measurement according to the endpoint short circuit test and the simulation wave velocity propagation characteristic curve; and correcting the double-end distance measurement formula according to the line length correction coefficient and the wave speed correction value, and optimizing the double-end distance measurement value. The line patrol time of line patrol workers is effectively reduced through conversion of the actual fault distance to the nominal fault distance, the economic loss caused by faults is reduced, and the stability and the reliability of the system are improved. By correcting the relevant parameters of the line length value and the wave velocity propagation value, the traveling wave distance measurement precision is effectively improved, and the requirement of the target engineering fault positioning precision is met.

Description

A traveling wave ranging method and system considering comprehensive parameter changes

A traveling wave ranging method and system considering comprehensive parameter changes

technical field

The present invention relates to the technical field of fault location, and more specifically, to a traveling wave ranging method and system taking into account changes in comprehensive parameters.

Background technique

Transmission lines are one of the most faulty equipment in the power system. Once a fault trip occurs, it will affect the production and operation of the national economy and bring inconvenience to people's lives. Accurate fault location of transmission lines in the power system can quickly narrow the scope of fault location, reduce the burden of line inspection, and shorten the time for fault elimination.

As a unique fault location technology, traveling wave ranging can be divided into single-ended method and double-ended method. It is difficult for the single-ended method to correctly identify fault reflected waves in long lines, so its application is limited.

At present, the double-ended method is widely used. The basic principle is that when a fault occurs inside the line, the current transient fault component caused by the initial traveling wave surge of the fault will be felt at both ends of the line. The time when the current transient fault component appears at both ends of the line is the time when the initial traveling wave surge of the fault arrives, so the difference between the absolute time of the current transient fault component felt at both ends of the line is used to calculate the fault point to the measurement point at both ends of the line The distance between them can realize double-ended traveling wave fault location. The double-terminal method needs to monitor the accurate time when the initial traveling wave of the fault point arrives at the two measurement terminals to complete the positioning, and does not need to analyze and identify the reflected wave, so the reliability of distance measurement is high.

However, in practical applications, there is a problem of insufficient long-term ranging accuracy in double-terminal traveling wave ranging. The main influencing factors are as follows:

(1) The total length of the line is not constant

The line wire has the characteristics of thermal expansion and cold contraction, so the length of the line will also change with the change of seasonal temperature. A large line length change will lead to a traveling wave ranging error of several kilometers, which makes the fault traveling wave ranging error larger.

(2) Measurement of traveling wave velocity

The actual wave speed is uncertain due to the influence of line parameters, frequency variation, geographical location, climate and many other factors. The attenuation of the high-frequency part of the traveling wave causes the amplitude of the wave speed to decrease. The measured wave speed is not constant. In the past, a certain value close to the speed of light was usually taken. Fixed value, fixed value wave velocity calculation will produce large error.

To sum up, the factors that affect the accuracy of traveling wave ranging include the time of arrival of the fault traveling wave, the total length of the line, and the velocity of the traveling wave. In UHV long-distance transmission lines, the accuracy of traveling wave ranging is more affected by the overall length parameters of the measured line and wave velocity propagation parameters, which increases the ranging error and restricts the application of traveling wave ranging technology.

Contents of the invention

According to the present invention, a traveling wave ranging method and system considering comprehensive parameter changes are provided to solve the factors that affect the accuracy of traveling wave ranging, such as the time of arrival of faulty traveling wave, the total length of the line, and the speed of traveling wave. In UHV long-distance transmission lines, the accuracy of traveling wave ranging is more affected by the parameters of the total length of the line under test and the propagation parameters of wave velocity, which increases the ranging error and restricts the technical problems of the application of traveling wave ranging technology.

According to a first aspect of the present invention, there is provided a traveling wave ranging method that takes into account changes in comprehensive parameters, including:

Decompose the line parameters, take subcontract calculations for the full length of the line, and determine the length of each subcontract segment;

According to the actual line length L _i of each subcontracted and segmented line, calculate the full line length correction value L and the subcontracted line length correction coefficient K _i ;

；According to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, determine the wave velocity correction value at both ends of the double-ended ranging

;

According to the line length correction coefficient and wave velocity correction value, the double-end ranging formula is corrected, and the double-end ranging value is optimized;

Among them, according to the line length correction coefficient and wave velocity correction value, the double-end ranging formula is corrected, and the double-end ranging value is optimized, including:

与全线线长修正值L ；According to the weather and environmental conditions of each package and referring to the correction coefficient table, select the corresponding subcontract line length correction factor

And the line length correction value L of the whole line;

、全线线长修正值

和双端测距时标

、修正双端测距公式，计算基于线长均匀变化的双端测距结果:Correction value according to wave speed

, the whole line length correction value

and double-ended ranging time scale

, Modify the double-end ranging formula, and calculate the double-end ranging result based on the uniform change of line length:

为M端线长故障测距均值，

为N端线长故障测距均值；Among them, s is the location of the fault point, and the two sides of the line are respectively marked as M terminal and N terminal,

is the mean value of fault distance measurement for the line length at the M end,

is the average fault distance measurement of the N-terminal line length;

计算线长分段变化的M端标称线长下故障测距值

，利用线长均匀变化的N端线长故障测距均值

计算线长分段变化的N端标称线长下故障测距值

，得出双端标称故障距离

、

：According to the formulas (2) (3), the average value of the fault distance of the M-terminal line length with uniform change of the line length

Calculate the fault location value under the nominal line length of the M end with segmental changes in the line length

, using the mean value of the N-terminal line length fault distance measurement with uniform line length variation

Calculation of the fault location value under the nominal line length of the N terminal

, to obtain the double-ended nominal distance to fault

,

:

为故障点所在包段线长修正系数。in,

It is the correction factor for the line length of the packet section where the fault point is located.

Optionally, the line parameters are decomposed, and the total length of the line is calculated by subcontracting to determine the subcontracted and segmented lines. The length includes:

Decompose the target project wire model, the proportion of span, the annual weather and geographical environment of each region;

Divide the entire length of the line into sub-packages, divide areas with similar weather and geographical conditions into one package, or design package sections, and divide heavy ice areas and special mountainous areas into one package separately;

According to the calculation of wire type, each subpackage is divided into different areas according to different wire types;

For the calculation of sub-gap, the same subcontract and the same conductor area continue to divide each area into different sections according to different spans, and determine the length of each subcontract segment.

Optionally, calculating a line length correction value and a line length correction coefficient according to the actual line lengths of each packetized and segmented line, including:

Calculate the actual line length of each subpacket segment line;

；Accumulate the actual line lengths of the sub-package and segment lines to obtain the correction value of the line length of the whole line

;

比对，计算不同天气与环境状况的线路分包长度的线长修正系数

：Compare the line length correction value with the nominal overall length of the line

Comparing and calculating the line length correction coefficient of the line subcontract length under different weather and environmental conditions

:

（4）

(4)

为线路标称线长，按档距线路长度计算，不考虑弧垂影响；

is the nominal line length of the line, calculated according to the line length of the span, without considering the effect of sag;

为实际线路长度，考虑弧垂影响。

is the actual line length, considering the effect of sag.

Optionally, according to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, determine the wave velocity correction values at both ends of the double-ended ranging, including:

According to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, the wave velocity propagation characteristic curve at different distances of the short-circuit test system is fitted;

，计算线路故障测距粗略值

：When an electrical fault occurs on the line, according to the calibration time of the double-ended fault in the system debugging short-circuit test, the fault location data recording time data is obtained

, to calculate the rough value of line fault distance

:

；

;

，参照波速传播特性曲线，动态选取双端测距两端的波速修正值

。Rough value based on fault distance

, referring to the wave velocity propagation characteristic curve, dynamically select the wave velocity correction values at both ends of the double-ended ranging

.

According to another aspect of the present invention, there is also provided a traveling wave ranging system that takes into account changes in comprehensive parameters, including:

The subcontracted and segmented line length calculation module is used to decompose the line parameters, adopt subcontracted calculations for the full length of the line, and determine each subcontracted and segmented line;

The line length correction coefficient calculation module is used to calculate the line length correction value and the line length correction coefficient according to the actual line length of each subcontracted and segmented line;

The wave velocity correction value calculation module is used to determine the wave velocity correction values at both ends of the double-end distance measurement according to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve;

Optimize the double-end distance measurement module, which is used to correct the double-end distance measurement formula and optimize the double-end distance measurement value according to the line length correction coefficient and wave velocity correction value;

Wherein, optimize the double-ended ranging value module, including:

与全线线长修正值

；Select the line length correction value sub-module, which is used to select the corresponding subcontract line length correction coefficient according to the weather and environmental conditions of each package and refer to the correction coefficient table

and full line length correction value

;

、全线线长修正值

和双端测距时标

、修正双端测距公式，计算基于线长均匀变化的双端测距结果:Select the double-ended ranging average sub-module to correct the value according to the wave velocity

, the whole line length correction value

and double-ended ranging time scale

, Modify the double-end ranging formula, and calculate the double-end ranging result based on the uniform change of line length:

为M端线长故障测距均值，

为N端线长故障测距均值；Among them, s is the location of the fault point, and the two sides of the line are respectively marked as M terminal and N terminal,

is the mean value of fault distance measurement for the line length at the M end,

is the average fault distance measurement of the N-terminal line length;

计算线长分段变化的M端标称线长下故障测距值

，利用线长均匀变化的N端线长故障测距值

计算线长分段变化的N端标称线长下故障测距值

，得出双端标称故障距离

、

：Select the double-ended nominal distance measurement sub-module, according to the formula (2) (3), use the M-terminal line length fault distance measurement value with uniform change of line length

Calculate the fault location value under the nominal line length of the M end with segmental changes in the line length

, using the N-terminal line length fault location value with uniform change in line length

Calculation of the fault location value under the nominal line length of the N terminal

, to obtain the double-ended nominal distance to fault

,

:

为故障点所在包段线长修正系数。in,

It is the correction factor for the line length of the packet section where the fault point is located.

Optionally, determine the packet segment line module, including:

Decompose the target project sub-module, which is used to decompose the target project conductor model, span ratio, annual weather and geographical environment in each region;

Sub-package section division sub-module is used to divide the entire length of the line into sub-package sections, divide areas with similar weather and geographical environment into one package, or design package section division, and divide heavy ice areas and special mountainous areas separately for a pack;

Divide sub-modules in different areas for calculation of sub-wire types, and divide the subpackages into different areas according to different types of wires;

Determine the sub-modules of each sub-package and segment line for the calculation of the sub-segment distance. The same sub-contract and the same wire area continue to divide each area into different segments according to different spans, and determine the length of each sub-contract and segment line.

Optionally, calculate the line length correction coefficient module, including:

Calculating the sub-module of sub-packet and segment line length, used to calculate the actual line length of each sub-packet and segment line;

；Obtain the line length correction value sub-module, which is used to accumulate the actual line lengths of the sub-package and segment lines to obtain the line length correction value

;

与线路标称全长

比对，计算不同天气与环境状况的线路分包长度的线长修正系数

：Calculating the line length correction coefficient sub-module, used to convert the line length correction value

and line nominal overall length

Comparing and calculating the line length correction coefficient of the line subcontract length under different weather and environmental conditions

:

（4）

(4)

为线路标称线长，按档距线路长度计算，不考虑弧垂影响；

is the nominal line length of the line, calculated according to the line length of the span, without considering the effect of sag;

为实际线路长度，考虑弧垂影响。

is the actual line length, considering the effect of sag.

Optionally, determine the wave velocity correction value module, including:

The fitting propagation characteristic curve sub-module is used to fit the wave velocity propagation characteristic curve at different distances of the short-circuit test system according to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve;

，计算线路故障测距粗略值

：The sub-module for calculating the rough value of line fault distance measurement is used to obtain fault distance measurement data recording time data according to the calibration time of double-terminal faults in the short-circuit test of the system when an electrical fault occurs on the line

, to calculate the rough value of line fault distance

:

；

;

，参照波速传播特性曲线，动态选取双端测距两端的波速修正值

。Determine the wave speed correction value sub-module, which is used to measure the rough value according to the fault distance

, referring to the wave velocity propagation characteristic curve, dynamically select the wave velocity correction values at both ends of the double-ended ranging

.

Therefore, the simulation data and the actual measurement data of the engineering short-circuit test are comprehensively analyzed, and the wave velocity value is corrected, which solves the problem of increasing the distance measurement accuracy error caused by only analyzing the simulation data. A calculation method for calculating the actual line length is proposed, and the line length correction coefficient is calculated, which reduces the fault location error problem caused by the uneven change of line length. Through the conversion of the actual fault distance to the nominal fault distance, the line inspection time of the line inspection staff is effectively reduced, the economic loss caused by the fault is reduced, and the system stability and reliability are improved. By modifying the parameters related to the line length value and wave velocity propagation value, the accuracy of traveling wave ranging is effectively improved, and the target engineering fault location accuracy requirements are met.

Description of drawings

A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:

FIG. 1 is a schematic flow diagram of a traveling wave ranging method that takes into account comprehensive parameter changes described in this embodiment;

FIG. 2 is a schematic flow chart of the steps of a traveling wave ranging method that takes into account changes in comprehensive parameters described in this embodiment;

FIG. 3 is a schematic diagram of the line subcontracting section described in this embodiment;

FIG. 4 is a schematic diagram of line subcontracting described in this embodiment;

FIG. 5 is a schematic diagram of double-end ranging described in this embodiment;

FIG. 6 is a schematic diagram of a traveling wave distance measuring system considering comprehensive parameter changes according to this embodiment.

detailed description

Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.

Unless otherwise stated, the terms (including scientific and technical terms) used herein have the meanings commonly understood by those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.

According to the first aspect of the present invention, a traveling wave ranging method 100 that takes into account changes in comprehensive parameters is provided. Referring to FIG. 1, the method 100 includes:

S101: Decompose the line parameters, take subcontract calculations for the full length of the line, and determine the length of each subcontract segment;

S102: According to the actual line length L _i of each subcontracted and segmented line, calculate the full line length correction value L and the subcontracted line length correction coefficient K _i ;

；S103: According to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, determine the wave velocity correction value at both ends of the double-ended ranging

;

S104: According to the line length correction coefficient and the wave velocity correction value, correct the double-end ranging formula and optimize the double-end ranging value;

Among them, according to the line length correction coefficient and wave velocity correction value, the double-end ranging formula is corrected, and the double-end ranging value is optimized, including:

与全线线长修正值L ；According to the weather and environmental conditions of each package and referring to the correction coefficient table, select the corresponding subcontract line length correction factor

And the line length correction value L of the whole line;

、全线线长修正值

和双端测距时标

、修正双端测距公式，计算基于线长均匀变化的双端测距结果:Correction value according to wave speed

, the whole line length correction value

and double-ended ranging time scale

, Modify the double-end ranging formula, and calculate the double-end ranging result based on the uniform change of line length:

为M端线长故障测距均值，

为N端线长故障测距均值；Among them, s is the location of the fault point, and the two sides of the line are respectively marked as M terminal and N terminal,

is the mean value of fault distance measurement for the line length at the M end,

is the average fault distance measurement of the N-terminal line length;

计算线长分段变化的M端标称线长下故障测距值

，利用线长均匀变化的N端线长故障测距均值

计算线长分段变化的N端标称线长下故障测距值

，得出双端标称故障距离

、

：According to the formulas (2) (3), the average value of the fault distance of the M-terminal line length with uniform change of the line length

Calculate the fault location value under the nominal line length of the M end with segmental changes in the line length

, using the mean value of the N-terminal line length fault distance measurement with uniform line length variation

Calculation of the fault location value under the nominal line length of the N terminal

, to obtain the double-ended nominal distance to fault

,

:

为故障点所在包段线长修正系数。in,

It is the correction factor for the line length of the packet section where the fault point is located.

Specifically, with reference to what is shown in FIG. 2, the steps and flow of this embodiment are described:

Step 1: Decompose the line parameters, and calculate the total length of the line by subcontracting.

Step 2: Subcontract to calculate the line length correction value, and set the line length correction coefficient.

Step 3: Calculate the wave velocity propagation value and set the wave velocity correction coefficient.

Step 4: According to the line length correction coefficient and wave velocity correction coefficient, correct the double-end ranging formula and optimize the double-end ranging value.

Said step 1 includes:

Step 1-1: Decompose the conductor type of the target project, the ratio of spans, and the annual weather and environmental conditions in each region.

Step 1-2: Referring to Figure 3, divide the entire length of the route into sub-packages. According to similar weather and geographical environment conditions, or design package sections, special areas such as heavy ice areas and mountains should be divided into one package separately.

Step 1-3: Calculate by wire type, and divide each subpackage into different areas according to different wire types.

Step 1-4: Calculation by span, the same conductor area in the same subcontract continues to be divided into different sections according to different spans.

Said step 2 includes:

Step 2-1: Calculate the actual line length of each sub-packet and segment line.

。Step 2-2: Calculate and accumulate the line lengths for the above subcontracted and segmented lines to obtain the actual total length of the line

.

比对，计算不同天气与环境状况的系列线长修正系数

。Step 2-3: Nominal overall length with line

Comparing and calculating series of line length correction coefficients for different weather and environmental conditions

.

Said step 3 includes:

Step 3-1: According to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, fit the wave velocity propagation characteristic curve at different distances of the short-circuit test system.

，计算线路故障测距粗略值

。

Step 3-2: When an electrical fault occurs on the line, according to the calibration time of the double-terminal fault in the system debugging short-circuit test, the fault location data recording time data is obtained

, to calculate the rough value of line fault distance

.

，参照波速传播特性曲线，动态选取双端测距两端的波速传播值

。Step 3-3: Rough value based on fault distance

, referring to the wave velocity propagation characteristic curve, dynamically select the wave velocity propagation values at both ends of the double-ended ranging

.

The step 4:

与线长修正值（实际线路全长）

。Step 4-1: Referring to Figure 4, select the corresponding subcontract line length correction factor according to the weather and environmental conditions of each package and refer to the correction coefficient table

and line length correction value (full length of the actual line)

.

Among them, the ratio of the nominal length of the line to the actual length of the line is the correction coefficient of the line length, and the calculation formula is as follows:

（4）

(4)

为线路分包长度的修正系数，

is the correction coefficient of the line packet length,

为线路标称线长，按档距线路长度计算，不考虑弧垂影响。

is the nominal line length of the line, calculated according to the line length of the span, without considering the effect of sag.

为实际线路长度，考虑弧垂影响。

is the actual line length, considering the effect of sag.

、线长修正值（实际线路全长）

和双端测距时标

、分包线长修正系数修正双端测距公式，优化双端测距结果。修正后的公式如式（1）所述。Referring to Figure 5, according to the wave velocity correction value

, Line length correction value (full length of the actual line)

and double-ended ranging time scale

, The subcontract line length correction coefficient corrects the double-end distance measurement formula, and optimizes the double-end distance measurement result. The revised formula is described in formula (1).

为M端故障测距计算值，

为N端故障测距计算值。In formula (1), x is the location of the fault point, and the two sides of the line are respectively marked as M terminal and N terminal,

is the calculated value of the fault location at the M terminal,

Calculated value for N-terminal fault locating.

归算到标称线长下故障测距值

，将步骤4-2计算结果带入下式（2）、（3）得出双端标称故障距离

、

。Step 4-3: Based on a certain state (span, weather conditions, tower) uniformly changing line length fault distance measurement value

Calculated to the fault location value under the nominal line length

, put the calculation results of step 4-2 into the following formulas (2), (3) to get the double-ended nominal fault distance

,

.

中为故障点x处所在包段线长修正系数。Formula (2), (3)

where is the correction coefficient of the packet line length at the fault point x.

Considering sag, temperature, icing, wind and other factors that affect the line length change, a calculation method for calculating the actual line length is proposed, which eliminates the fault location error caused by the line length change. The total length of the line is affected by weather and environmental factors in different regions, resulting in different length changes. The subcontracting calculation method is to decompose the target engineering line according to the weather characteristics of a certain area, which effectively solves the problem of the length of each section of the line caused by weather changes in different areas. It can effectively calculate the accurate value of the total length of the line in different seasons, and eliminate the fault location error caused by the uneven change of the length of each envelope.

Through the conversion of the actual fault distance to the nominal fault distance, the line inspection time of the line inspection staff is effectively reduced, the economic loss caused by the fault is reduced, and the system stability and reliability are improved.

Due to the influence of line parameters and environmental parameters and other factors, the wave velocity becomes an indefinite value that is difficult to calculate accurately, and the accurate calculation on site does not match the reality. Therefore, it is proposed to use the measured actual wave velocity value to correct the existing wave velocity value. The combination of theory and simulation improves the accuracy of fitting the actual wave velocity propagation characteristic curve, and corrects the wave velocity value at the time of failure. The fault location error caused by different degrees of attenuation and change of wave velocity is eliminated.

By modifying the parameters related to the line length value and wave velocity propagation value, the accuracy of traveling wave ranging is effectively improved, and the target engineering fault location accuracy requirements are met.

Optionally, the line parameters are decomposed, and the total length of the line is calculated by subcontracting to determine each subcontracted and segmented line, including:

Decompose the target project wire model, the proportion of span, the annual weather and geographical environment of each region;

Divide the entire length of the line into sub-packages, divide areas with similar weather and geographical conditions into one package, or design package sections, and divide heavy ice areas and special mountainous areas into one package separately;

According to the calculation of wire type, each subpackage is divided into different areas according to different wire types;

For the calculation of sub-gap, the same subcontract and the same conductor area continue to be divided into different sections according to different spans, and each subcontract and segment line is determined.

Optionally, calculating a line length correction value and a line length correction coefficient according to the actual line lengths of each packetized and segmented line, including:

Calculate the actual line length of each subpacket segment line;

；Accumulate the actual line lengths of the subpackage and segment lines to obtain the line length correction value

;

与线路标称全长

比对，计算不同天气与环境状况的线路分包长度的线长修正系数

：The line length correction value

and line nominal overall length

Comparing and calculating the line length correction coefficient of the line subcontract length under different weather and environmental conditions

:

（4）

(4)

为线路标称线长，按档距线路长度计算，不考虑弧垂影响；

is the nominal line length of the line, calculated according to the line length of the span, without considering the effect of sag;

为实际线路长度，考虑弧垂影响。

is the actual line length, considering the effect of sag.

Optionally, according to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, determine the wave velocity correction values at both ends of the double-ended ranging, including:

According to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve, the wave velocity propagation characteristic curve at different distances of the short-circuit test system is fitted;

，计算线路故障测距粗略值

：When an electrical fault occurs on the line, according to the calibration time of the double-ended fault in the system debugging short-circuit test, the fault location data recording time data is obtained

, to calculate the rough value of line fault distance

:

；

;

，参照波速传播特性曲线，动态选取双端测距两端的波速修正值

。Rough value based on fault distance

, referring to the wave velocity propagation characteristic curve, dynamically select the wave velocity correction values at both ends of the double-ended ranging

.

Therefore, the simulation data and the actual measurement data of the engineering short-circuit test are comprehensively analyzed, and the wave velocity value is corrected, which solves the problem of increasing the distance measurement accuracy error caused by only analyzing the simulation data. A calculation method for calculating the actual line length is proposed, and the line length correction coefficient is calculated, which reduces the fault location error problem caused by the uneven change of line length. Through the conversion of the actual fault distance to the nominal fault distance, the line inspection time of the line inspection staff is effectively reduced, the economic loss caused by the fault is reduced, and the system stability and reliability are improved. By modifying the parameters related to the line length value and wave velocity propagation value, the accuracy of traveling wave ranging is effectively improved, and the target engineering fault location accuracy requirements are met.

According to another aspect of the present invention, there is also provided a traveling wave ranging system 600 that takes into account changes in comprehensive parameters, as shown in FIG. 6 , the system 600 includes:

Subpackage segment line length calculation module 610, used to decompose line parameters, take subpackage calculation for the full length of the line, and determine each subpacket segment line;

A line length correction coefficient calculation module 620, configured to calculate a line length correction value and a line length correction coefficient according to the actual line length of each subpacket and segment line;

The wave velocity correction value calculation module 630 is used to determine the wave velocity correction values at both ends of the double-ended ranging according to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve;

Optimizing the double-end ranging value module 640, which is used to correct the double-end ranging formula and optimize the double-end ranging value according to the line length correction coefficient and the wave velocity correction value;

Wherein, optimize the double-ended ranging value module, including:

与全线线长修正值

；Select the line length correction value sub-module, which is used to select the corresponding subcontract line length correction coefficient according to the weather and environmental conditions of each package and refer to the correction coefficient table

and full line length correction value

;

、全线线长修正值

和双端测距时标

、修正双端测距公式，计算基于线长均匀变化的双端测距结果:Select the double-ended ranging average sub-module to correct the value according to the wave velocity

, the whole line length correction value

and double-ended ranging time scale

, Modify the double-end ranging formula, and calculate the double-end ranging result based on the uniform change of line length:

为M端线长故障测距均值，

为N端线长故障测距均值；Among them, s is the location of the fault point, and the two sides of the line are respectively marked as M terminal and N terminal,

is the mean value of fault distance measurement for the line length at the M end,

is the average fault distance measurement of the N-terminal line length;

计算线长分段变化的M端标称线长下故障测距值

，利用线长均匀变化的N端线长故障测距值

计算线长分段变化的N端标称线长下故障测距值

，得出双端标称故障距离

、

：Select the double-ended nominal distance measurement sub-module, according to the formula (2) (3), use the M-terminal line length fault distance measurement value with uniform change of line length

Calculate the fault location value under the nominal line length of the M end with segmental changes in the line length

, using the N-terminal line length fault location value with uniform change in line length

Calculation of the fault location value under the nominal line length of the N terminal

, to obtain the double-ended nominal distance to fault

,

:

为故障点所在包段线长修正系数。in,

It is the correction factor for the line length of the packet section where the fault point is located.

Optionally, determine the subpacket segment line module 610, including:

Decompose the target project sub-module, which is used to decompose the target project conductor model, span ratio, annual weather and geographical environment in each region;

Sub-package section division sub-module is used to divide the entire length of the line into sub-package sections, divide areas with similar weather and geographical environment into one package, or design package section division, and divide heavy ice areas and special mountainous areas separately for a pack;

Divide sub-modules in different areas for calculation of sub-wire types, and divide the subpackages into different areas according to different types of wires;

Determine the sub-modules of each sub-package and segment line for the calculation of the sub-segment distance. The same sub-contract and the same wire area continue to divide each area into different segments according to different spans, and determine the length of each sub-contract and segment line.

Optionally, the calculation line length correction coefficient module 620 includes:

Calculating the sub-module of sub-packet and segment line length, used to calculate the actual line length of each sub-packet and segment line;

；Obtain the line length correction value sub-module, which is used to accumulate the actual line lengths of the sub-package and segment lines to obtain the line length correction value

;

与线路标称全长

比对，计算不同天气与环境状况的线路分包长度的线长修正系数

：Calculating the line length correction coefficient sub-module, used to convert the line length correction value

and line nominal overall length

Comparing and calculating the line length correction coefficient of the line subcontract length under different weather and environmental conditions

:

（4）

(4)

为线路标称线长，按档距线路长度计算，不考虑弧垂影响；

is the nominal line length of the line, calculated according to the line length of the span, without considering the effect of sag;

为实际线路长度，考虑弧垂影响。

is the actual line length, considering the effect of sag.

Optionally, determine the wave velocity correction value module 630, including:

The fitting propagation characteristic curve sub-module is used to fit the wave velocity propagation characteristic curve at different distances of the short-circuit test system according to the terminal short-circuit test and the simulated wave velocity propagation characteristic curve;

，计算线路故障测距粗略值

：The sub-module for calculating the rough value of line fault distance measurement is used to obtain fault distance measurement data recording time data according to the calibration time of double-terminal faults in the short-circuit test of the system when an electrical fault occurs on the line

, to calculate the rough value of line fault distance

:

；

;

，参照波速传播特性曲线，动态选取双端测距两端的波速修正值

。Determine the wave speed correction value sub-module, which is used to measure the rough value according to the fault distance

, referring to the wave velocity propagation characteristic curve, dynamically select the wave velocity correction values at both ends of the double-ended ranging

.

A traveling wave ranging system 600 that takes into account changes in comprehensive parameters in an embodiment of the present invention corresponds to a traveling wave ranging method 100 that takes into account changes in comprehensive parameters in another embodiment of the present invention, and will not be repeated here repeat.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein. The solutions in the embodiments of the present application can be realized by using various computer languages, for example, the object-oriented programming language Java and the literal translation scripting language JavaScript.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present application have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be construed to cover the preferred embodiment and all changes and modifications which fall within the scope of the application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (8)

1. A traveling wave ranging method considering comprehensive parameter changes is characterized by comprising the following steps:

decomposing line parameters, performing sub-packet calculation on the full length of the line, and determining the actual line length of each sub-packet segmented line;

according to the actual line length L of each sub-packet segmented line _i Calculating the correction value L of the total line length and the correction coefficient K of the partial line length _i ；

Determining wave velocity correction values at two ends of double-end distance measurement according to an endpoint short circuit test and a simulation wave velocity propagation characteristic curve

；

Correcting a double-end distance measurement formula according to the line length correction coefficient and the wave speed correction value, and optimizing a double-end distance measurement value;

wherein, according to line length correction coefficient, wave speed correction value, revise the bi-polar range finding formula, optimize the bi-polar range finding value, include:

selecting corresponding correction coefficient of the length of the branch wires according to the weather and the environmental condition of each packet and by referring to the correction coefficient table

And a full line length correction value L;

correcting values according to wave velocity

Corrected value of total line length

And double-ended ranging time scale

Correcting a double-end distance measurement formula, and calculating a double-end distance measurement result based on uniform line length change:

wherein s is the position of the fault point, the two sides of the line are respectively marked as an M end and an N end,

is the mean value of the fault distance measurement of the line length at the M end,

the mean value of the N-end line length fault distance measurement is obtained;

according to the formulas (2) and (3), the mean value of the M-end line length fault distance measurement with the line length uniformly changed is utilized

Calculating fault distance measurement value under M-end nominal line length with line length sectionally changed

Mean value of N-end line length fault distance measurement by using line length uniform change

Calculating fault distance measurement value under N-end nominal line length with line length sectionally changed

To obtain the nominal fault distance of both ends

、

：

Wherein,

and correcting the coefficient for the length of the section line where the fault point is located.

2. The method of claim 1, wherein decomposing the line parameters, performing a packet calculation on the full length of the line, and determining the length of each packet segment line comprises:

decomposing the model number of a target engineering lead, the span occupation ratio, the annual weather and the geographic environment condition of each region;

dividing the whole length of the line into packets, dividing the regions with weather similar to the geographical environment condition into one packet, or designing packet division, and independently dividing the heavy ice region and the mountain region special region into one packet;

calculating the types of the branch wires, and dividing each sub-packet into different areas according to different wire types;

and (4) calculating the step pitch, continuously dividing each region into different segments according to different step pitches in the same wire region of the same sub-packet, and determining the length of each sub-packet segmented line.

3. The method of claim 1, wherein calculating a line length correction value and a line length correction factor based on the actual line length of each packetized segment line comprises:

calculating the actual line length of each sub-packet segmented line;

accumulating the actual line lengths of the sub-packet segmented lines to obtain a full line length correction value

；

Correcting the line length

Nominal total length with the line

Comparing and calculating the line length correction coefficient of the line sub-packet length of different weather and environmental conditions

：

（4）

Calculating the nominal line length of the line according to the length of the span line without considering the sag influence;

for the actual line length, the sag effect is considered.

4. The method of claim 1, determining wave velocity correction values for both ends of a double-ended range measurement based on an endpoint short circuit test and a simulated wave velocity propagation characteristic curve, comprising:

fitting wave velocity propagation characteristic curves of the short circuit test system at different distances according to the endpoint short circuit test and the simulation wave velocity propagation characteristic curve;

when the circuit is electrifiedWhen the fault occurs, according to the calibration time of the double-end fault of the system debugging short circuit test, the time data of fault distance measurement data recording is obtained

Calculating the coarse value of line fault range finding

：

；

Ranging rough value according to fault

Dynamically selecting wave speed correction values at two ends of double-end distance measurement according to a wave speed propagation characteristic curve

。

5. A traveling wave ranging system that accounts for synthetic parameter variations, comprising:

the sub-packet segmented line length calculation module is used for decomposing line parameters, performing sub-packet calculation on the full length of the line and determining each sub-packet segmented line;

the wire length correction coefficient calculation module is used for calculating a wire length correction value and a wire length correction coefficient according to the actual line length of each sub-packet segmented line;

the wave velocity correction value calculation module is used for determining wave velocity correction values at two ends of double-end distance measurement according to the endpoint short circuit test and the simulation wave velocity propagation characteristic curve;

the double-end distance measurement optimizing module is used for correcting a double-end distance measurement formula according to the line length correction coefficient and the wave velocity correction value and optimizing a double-end distance measurement value;

wherein, optimize bi-polar range finding value module includes:

selected line length correction value submoduleThe correction coefficient table is used for selecting the corresponding correction coefficient of the length of the sub-packaging line according to the weather and the environmental condition of each package and by referring to the correction coefficient table

And the correction value of the whole line length

；

Selecting a double-end ranging mean sub-module for correcting values according to wave velocity

Correction value of total line length

And double-ended ranging time scale

Correcting a double-end distance measurement formula, and calculating a double-end distance measurement result based on uniform line length change:

wherein s is the position of the fault point, the two sides of the line are respectively marked as an M end and an N end,

is the mean value of the fault distance measurement of the line length at the M end,

the mean value of the N-end line length fault distance measurement is obtained;

selecting a double-end nominal distance measurement submodule, and utilizing the fault distance measurement value of the M-end line length with the line length uniformly changed according to the formulas (2) and (3)

M end nominal for calculating line length sectional changeFault location value under line length

And the N-end line length fault distance measurement value utilizing the uniform change of the line length

Calculating fault distance measurement value under N-end nominal line length with line length sectionally changed

To obtain the nominal fault distance of both ends

、

：

Wherein,

and correcting the coefficient for the length of the section line where the fault point is located.

6. The system of claim 5, wherein determining a packetized segmented line module comprises:

the decomposition target engineering submodule is used for decomposing the model number of a target engineering lead, the span occupation ratio, the annual weather and the geographic environment condition of each region;

the sub-packet segment dividing module is used for performing packet segment division on the whole length of the line, dividing regions with weather close to the geographical environment condition into one packet, or designing packet segment division, and independently dividing heavy ice regions and mountain region special regions into one packet;

the sub-modules for dividing different regions are used for calculating the types of the branch wires, and each sub-package is divided into different regions according to different types of the branch wires;

and determining sub-modules of each sub-packet segmented line, wherein the sub-modules are used for calculating the segmentation distances, and the same sub-packet same lead area continues to divide each area into different segments according to different segmentation distances so as to determine the length of each sub-packet segmented line.

7. The system of claim 6, wherein the calculate line length correction factor module comprises:

the sub-module for calculating the length of the sub-packet segmented line is used for calculating the actual line length of each sub-packet segmented line;

a sub-module for obtaining line length correction value, which is used for accumulating the actual line length of each sub-packet segmented line to obtain the full line length correction value

；

A submodule for calculating the linear length correction coefficient and used for correcting the linear length correction value

Nominal total length of line

Comparing and calculating the line length correction coefficient of the line sub-packet length of different weather and environmental conditions

：

（4）

Calculating the nominal line length of the line according to the length of the span line without considering the sag influence;

for the actual line length, the sag effect is considered.

8. The system of claim 5, wherein the determine wave velocity correction value module comprises:

the fitting propagation characteristic curve submodule is used for fitting the wave velocity propagation characteristic curves of the short-circuit test system at different distances according to the endpoint short-circuit test and the simulation wave velocity propagation characteristic curve;

the submodule for calculating the rough value of the line fault distance measurement is used for obtaining fault distance measurement data recording time data according to the calibration time of the double-end fault of the system debugging short-circuit test when the line has an electrical fault

Calculating the coarse value of line fault range finding

：

；

A wave velocity correction value determining submodule for ranging the coarse value according to the fault

Dynamically selecting wave velocity correction values at two ends of double-end distance measurement according to the wave velocity propagation characteristic curve

。

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