WO2012036363A1

WO2012036363A1 - Device for measuring a transmission line constant, and measurement method thereof

Info

Publication number: WO2012036363A1
Application number: PCT/KR2011/002861
Authority: WO
Inventors: 전동훈; 박영신
Original assignee: 한국전력공사
Priority date: 2010-09-17
Filing date: 2011-04-21
Publication date: 2012-03-22
Also published as: KR101006904B1

Abstract

The present invention improves a typical method of measuring a transmission line constant during an electrical outage, and relates to a device for measuring a transmission line constant, and a measurement method thereof, which improve a measurement accuracy of the transmission line constant by effectively compensating for the influence of a voltage that is induced into a transmission line, i.e., a measurement target of a line constant, by using a current flowing in a transmission line around the transmission line, i.e., a measurement target of a line constant, through a multi-path configuration and performing driving.

Description

Transmission line track constant measuring device and measuring method

The present invention relates to a transmission line line constant measuring device and a method for measuring the same (Device and Method for Measuring Transmission Line Parameter of Transmission Line), and more particularly, by correcting the influence of the induced voltage, thereby improving the measurement accuracy of the line constant It is about.

The first of the two methods of measuring the line constant of a conventional transmission line during a truce is to ground one end of the transmission line, install a current source at the other end, inject a current, and then measure the measured phase voltage and phase current information. Find the line constant using.

However, the ground return resistance affects the measurement accuracy of the track constant, and due to the characteristics of the ground return resistance that varies with the environment such as weather, temperature, and humidity, there is a problem that accurate track constant measurement is impossible.

Referring to FIG. 1 as a second method, it is an equivalent circuit for measuring the line constant of a transmission line during a truce. After grounding one end of the transmission line, the current source is installed at the other end and the current is injected, and the line constant is calculated by using the measured line voltage and line current information.

However, the voltage information used in the calculation of the line constant includes the influence of induced voltage generated by the environment around the line for which the line constant is measured, in particular the current flowing in the surrounding line, and the induced voltage which varies depending on the operating conditions. There was a problem that it is impossible to measure the accurate line constant because it affects the accuracy of the line constant measurement.

In addition, in the method of measuring the line constant of a transmission line during operation, the line constant is obtained by measuring time-synchronized voltage and current information from both ends of the transmission line.

However, in theory, it is possible to measure the line constant in real time considering all factors affecting the transmission line.

However, due to the unbalance of the bus voltage across the line in operation, the unbalance of the line current, the influence of the current flowing through the transmission line around the line constant measuring line magnetically on the line of the line constant measuring line and the measurement error. There was a problem that could not determine the exact line constant due to the fluctuation.

The present invention has been proposed to solve the above problems, and is an improvement of the conventional method of measuring the transmission line constant during transmission line interruption, and is a multi-line configuration and operation around the transmission line measurement target transmission line. The purpose of the present invention is to improve the accuracy of measuring transmission line constants by effectively compensating the effect of voltage induced on a transmission line subject to line constant measurement due to the current flowing in the transmission line.

In order to achieve the above object, a transmission line constant measuring apparatus according to an embodiment of the present invention includes: a current source source connected to two transmission lines each of which one end is grounded to apply a set current; An ammeter for measuring a current value flowing through the two transmission lines; A voltmeter for measuring a line voltage, which is a voltage between the two transmission lines, and an earth voltage of each of the two transmission lines; A data correction unit for calculating a correction voltage value correcting the influence of induced voltages on the two transmission lines by using the line voltage and the ground voltage measured by the voltmeter; And a line constant calculator configured to calculate a line constant for the line constant measurement objects including the two transmission lines using the correction voltage value and the current value.

In addition, the line constant measurement objects are configured in groups of two transmission lines for a plurality of transmission lines, and measuring current value, line voltage, and ground voltage for each group so that the plurality of transmission lines can be measured. It features.

In addition, the voltmeter includes a first voltmeter module for measuring the line voltage between the two transmission lines; A second voltmeter module and a third voltmeter module for measuring the voltage between the ground of each of the two transmission lines.

The current source source may be controlled to measure the current value, the line voltage and the ground voltage at the same time, and apply the set current different in magnitude to the line constant measurement object a plurality of times. It further includes a control unit for controlling.

In addition, the current source source is characterized in that to apply the set current having a different size and having a phase angle of 0 ° to the line constant measurement objects a plurality of times of setting times.

The line constant calculating unit may calculate a line constant calculation value by applying a setting current having a different magnitude to the line constant measurement targets a plurality of times.

The apparatus may further include an average calculation unit configured to calculate a track arithmetic average of track constant calculation values for the track constant measurement text and calculate a track constant of a corresponding transmission line.

The apparatus may further include a storage unit which accumulates and stores the track constant calculation values calculated from the track constant calculation unit.

According to another aspect of the present invention, there is provided a method for measuring a line constant of a transmission line, the method comprising: applying, by a current source source, one end of each of the transmission lines to grounded two transmission lines; ; Measuring a current value flowing through the two transmission lines by means of an ammeter; Measuring, by a voltmeter, the line voltage between the two transmission lines and the ground voltages of each of the two transmission lines; Calculating, by a data correction unit, a correction voltage value correcting the influence of induced voltages on the two transmission lines using the line voltage and the ground voltage measured in the measuring of the voltage; And calculating, by the line constant calculation unit, line constants for line constant measurement objects including two transmission lines using the calculated correction voltage value and the measured current value.

In addition, the line constant measurement objects are configured in groups of two transmission lines for a plurality of transmission lines, and measuring current values, line voltages, and ground voltages for each group so that the plurality of transmission lines can be measured. It features.

The method may further include controlling the ammeter and the voltmeter to measure the current value, the line voltage, and the ground voltage at the same time.

In the controlling step, the current source source may be controlled so that a predetermined current having a different magnitude is applied to the track constant measurement objects a plurality of times.

In the measuring of the voltage, the step of measuring the line voltage between the two transmission lines; And measuring the voltage between the grounds of each of the two transmission lines.

In addition, the step of applying a set current is characterized in that for applying the set current having a different size and having a phase angle of 0 ° to the line constant measurement object a plurality of times of setting times.

In the calculating of the line constant, the line constant calculation value may be calculated by applying a setting current having a different size to the line constant measurement target a plurality of times.

The method may further include calculating the line constants calculated from the line constant measurement targets by the average calculator to calculate the line constants of the corresponding transmission line.

The method may further include accumulating and storing track constant calculation values calculated by the track constant calculation unit by a storage unit.

According to the present invention, the conventional method for measuring transmission line constants during a transmission line truce is improved, and a multi-line configuration and operation result in a line constant measurement transmission line due to the current flowing in the transmission line around the transmission line measurement target line. Effectively correcting the influence of the voltage induced in the furnace has the effect of improving the line constant measurement accuracy.

1 is an equivalent circuit diagram of a line constant measurement using conventional line voltage and line current information.

2 is an equivalent circuit diagram of a line constant using line voltage and line current information for a transmission line measuring apparatus and method thereof according to an embodiment of the present invention.

3 is an overall configuration diagram of a transmission line measuring apparatus according to a first embodiment of the present invention.

4 is a view for explaining the transmission line line constant measurement in the first order according to FIG.

5 is a view for explaining the measurement of the transmission line line constant in the second order according to FIG.

6 is a view for explaining the measurement of the transmission line line constant in the third order according to FIG.

7 is a flowchart illustrating a method for measuring a transmission line according to FIG. 3.

8 is an overall configuration diagram of a transmission line measuring apparatus according to a second embodiment of the present invention.

9 and 10 are flowcharts for explaining the transmission line measuring method according to FIG.

11 and 12 are flowcharts illustrating a transmission line measuring method according to a third embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION In order to explain in detail that a person skilled in the art can easily implement the technical idea of the present invention, the most preferred embodiment of the present invention will be described with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, a transmission line line constant measuring apparatus and a measuring method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, all the variables of the equation used in the present invention means a vector value.

2 is an equivalent circuit diagram of a line constant using line voltage and line current information of a transmission line measuring apparatus and a method thereof according to an exemplary embodiment of the present invention.

2, the one due to the track integer calculation, the current flowing to a peripheral power line to the line constant measuring target transmission line, correcting the effect of voltage (V _Induction) induced in the tracks and constant measurement target power line data (V _Total - V _Induction ) to improve the accuracy of the line constant.

Thus, in order to measure the line constant using the line voltage and line current information, the equations according to the above are summarized as follows.

(Z _a + Z _b ) = (V _Total -V _Induction ) / I

In this way, it is possible to improve the measurement accuracy of the line constant by removing the influence of the induced voltage by using the above equation.

Also, in order to improve the accuracy of the measured line constants, the arithmetic mean is based on the number of line constants calculated by applying different setting currents of different magnitude to the line constant measurement targets through the current source source. By improving the accuracy of the line constant.

Referring to FIG. 3, the transmission line line constant measuring apparatus 100 includes a voltmeter 110 and an ammeter 120 including a first voltmeter module 111, a second voltmeter module 112, and a third voltmeter module 113. ), A data correction unit 130, a line constant calculation unit 140, a current source source 160, a control unit 170, and a storage unit 180.

The voltmeter 110 includes a first voltmeter module 111 for measuring the line voltage between two transmission lines, and a second voltmeter module 112 and a third voltmeter module for measuring the voltage between the grounds of each of the two transmission lines. Measure the voltage of 113).

Ammeter 120 measures the current value flowing through the two transmission lines.

The line constant measurement object is composed of groups for each of the two transmission lines for a plurality of transmission lines, and measures the current value, the line voltage, and the ground voltage for each group so that the plurality of transmission lines can be measured.

The data correction unit 130 calculates a correction voltage value correcting the influence of the induced voltage on the two transmission lines by using the line voltage and the ground voltage measured by the voltmeter 110.

The line constant calculation unit 140 calculates the line constant using the correction voltage value calculated by the data correction unit 130 and the current value measured by the ammeter 120.

That is, the track constant calculation value of each track constant measurement object is calculated.

The current source source 160 is connected to two transmission lines each of which one end is grounded to apply set currents having a specific size and a phase angle of 0 °.

The controller 170 controls the ammeter and the voltmeter to measure the current value, the line voltage, and the ground voltage at the same time.

Here, the method of measuring at the same time may be time synchronized through a GPS receiver or data communication.

The storage unit 180 stores the track constant calculation values of the track constant measurement targets.

4 is a view for explaining the transmission line line constant measurement in the first order according to FIG. 3, Figure 5 is a view for explaining the transmission line line constant measurement in the second order, Figure 6 is a third order It is a figure for demonstrating measuring line constant of a furnace transmission line.

A, B, and C are the transmission line to be measured for line constant, and E is the land.

The transmission line line constant measuring apparatus 100 includes a voltmeter 110, an ammeter 120, a data corrector 130, and a line constant calculator 140. An average calculator 150, a current source source 160, and the like.

In order to measure the transmission line constant during a truce, first, the transmission line A, B, and C should be cut off.

Referring to FIG. 4, a first end of the truncated transmission lines A, B, and C is grounded.

Then, the voltage V _AB applied to the current source source 160 through the line constant measuring device 100 on the grounded transmission lines A and B, the voltage between the transmission line A and the ground E (V _AE ), the transmission line B and the ground The connection between the voltage V _BE and the current I _AB of the current source source 160 can be measured.

Then, and in then applying a current (I _AB) is set by the current source the source 160 using the voltmeter 110 is a voltage (V _AB), voltage (V _AE) between the transmission lines A and the ground E, transmission lines B The set current I _AB information is measured using the voltage V _BE between the ground E and the ammeter 120.

Using the measured voltages (line voltage and ground voltage), the calculated voltage after correcting the influence of the induced voltage on the transmission lines A and B through the data correction unit 130 is calculated as follows.

V _(correction) = V _AE + V _AB -V _BE

The line constant is calculated using the measured voltages, the corrected voltage information, and the current value, the current value of which the influence of the induced voltage is corrected.

(Z _a + Z _b ) = (V _AE + V _AB -V _BE ) / I _AB

Therefore, the line constant values for the transmission lines A and B are calculated.

Referring to FIG. 5, the second order is grounded at one end of B, C, and earth E of the truncated transmission lines A, B, and C. FIG.

Then, the voltage (V _BC ) applied to the current source source 160 through the line constant measuring device 100 on the grounded transmission lines B and C, the voltage between the transmission line B and the ground E (V _BE ), the transmission line C and the ground The voltage V _CE and the current I _BC of the current source source 160 are connected so that the measurement can be performed.

Subsequently, after applying the set current I _BC through the current source source 160, the voltage V _BC , the voltage between the transmission line B and the ground E, V _BE , and the transmission line C The set current I _BC information is measured using the voltage V _CE between the earth E and the ammeter 120.

Using the measured voltages (line voltage and ground voltage), the correction voltage after correction of the influence of the induced voltage on the transmission lines B and C through the data correction unit 130 is calculated as follows.

V _(correction) = V _BE + V _BC -V _CE

The line constant is calculated using the corrected voltage information and current information with the influence of induced voltage.

(Z _B + Z _C ) = (V _BE + V _BC -V _CE ) / I _BC

Therefore, the line constant values for the transmission lines B and C are calculated.

Referring to FIG. 6, the third sequence is grounded at one end of C, A and the ground E of the truncated transmission lines A, B, and C. FIG.

Then, the voltage (V _CA ) applied to the current source source 160 through the line constant measuring device 100 on the grounded transmission line C and A, the voltage between the transmission line C and the ground E (V _CE ), the transmission line A and the ground voltage E (V _AE), and a wiring to be measured current (I _CA) source of the current source 160. the

Subsequently, after the set current I _CA is applied through the current source source 160, the voltage V _CA , the voltage between the transmission line C and the ground E, V _CE , and the transmission line A and the voltage are measured using the voltmeter 110. The set current I _CA information is measured using the voltage V _AE between the earth E and the ammeter 120.

Using the measured voltages (line voltage and ground voltage), the correction voltage after correction of the influence of the induced voltage on the transmission lines C and A through the data correction unit 130 is calculated as follows.

V _(correction) = V _CE + V _CA -V _AE

(Z _C + Z _A ) = (V _CE + V _CA -V _AE ) / I _CA

Therefore, the line constant values for the transmission lines C and A are calculated.

As described above, when a line constant is obtained by using two transmission lines as a group for a plurality of transmission lines A, B, and C, which are subject to measurement of the line constant,

(Z _a + Z _b ) = (V _AE + V _AB -V _BE ) / I _AB

(Z _B + Z _C ) = (V _BE + V _BC -V _CE ) / I _BC

(Z _C + Z _A ) = (V _CE + V _CA -V _AE ) / I _CA

The line constants Z _A , Z _B and Z _C are calculated using the values of (Z _a + Z _b ), (Z _B + Z _C ) and (Z _C + Z _A ) of each group.

After calculating the line constant of each transmission line once in this way, through the current source source 160, a plurality of times of setting currents having different magnitudes are applied and re-measured, and the calculated values of each group are used. Calculate the line constant of the furnace.

Z _{A + 1} , Z _{B + 1} , Z _{C + 1} / Z _{A + 2} , Z _{B + 2} , Z _{C + 3} ............... Z _{A + N} , Z _{B + N} , Z _{C + N}

The line constant calculation value calculated by the set number of times for each of the plurality of transmission lines A, B, and C is arithmetically averaged through the average calculating unit 150 to determine the line constant of the transmission line to be measured.

In addition, the average calculation unit 150 may determine the line constant by performing arithmetic average on the values of (Z _a + Z _b ), (Z _B + Z _C ), and (Z _C + Z _A ) of each group.

7 is a flowchart illustrating a transmission line measuring method.

Referring to FIG. 7, in order to measure the transmission line constant, first, a plurality of transmission lines that are the targets of the line constant measurement are suspended (S100).

Group the two transmission lines for a plurality of transmission lines, ground one end of the two transmission lines, connect the line constant measuring device to the two grounded transmission lines, and apply the set current through the current source source. S110).

Here, the set current is applied with a set current having a specific magnitude and a phase angle of 0 °.

Subsequently, an ammeter measures the current value flowing through the two transmission lines (S120).

The voltage between lines of the two transmission lines and the ground voltage of each of the two transmission lines are measured by a voltmeter (S130).

In other words, the method of measuring the voltage may be divided into measuring the line voltage between the two transmission lines, and measuring the voltage between the ground between each of the two transmission lines and the ground.

Then, the current value of the ammeter and the line voltage and the ground voltage of the voltmeter are measured at the same time.

Subsequently, the data correction unit calculates a correction voltage value correcting the influence of the induced voltage on the two transmission lines by using the line voltage and the ground voltage measured in the step of measuring the voltage (S140).

Then, the line constant calculation unit calculates one group line constant using the current value measured in the step of measuring the correction voltage value and the current value calculated in the step of calculating the correction voltage value (S150).

At this time, the controller checks whether all of the plurality of transmission lines that are the track constant measurement objects are measured for each group (S160).

Then, when all of the plurality of transmission lines are not measured, the order of measuring the current value, the line voltage, and the ground voltages for each group is repeated by replacing the remaining group connections belonging to the line constant measurement object.

Subsequently, when all of the plurality of transmission lines have been measured, the line constants for each of the plurality of transmission lines for each group are calculated (S180), and then accumulatively stored (S190).

Referring to FIG. 8, the transmission line line constant measuring apparatus 100 includes a voltmeter 110 and an ammeter 120 including a first voltmeter module 111, a second voltmeter module 112, and a third voltmeter module 113. ), A data corrector 130, a line constant calculator 140, an average calculator 150, a current source source 160, a controller 170, and a storage 180.

The voltmeter 110 includes a first voltmeter module 111 for measuring the line voltage between two transmission lines using two transmission lines as a group, and a second voltmeter module for measuring the voltage between the grounds of each of the two transmission lines. The voltage of the 112 and the third voltmeter module 113 is measured.

The line constant measurement target is composed of groups for each transmission line for a plurality of transmission lines, and measures the current value, line voltage, and ground voltage for each group so that the plurality of transmission lines can be measured.

The line constant calculating unit 140 uses a correction voltage value calculated by the data correcting unit 130 and a current value measured by the ammeter 120 to set a current different in magnitude by a plurality of times of setting for the line constant measuring objects. Calculate the calculated line constant.

The average calculating unit 150 calculates the line constants for the measurement targets of the line constants based on the calculated line constants calculated by applying a setting current having a different size by the set number of times for each of the plurality of transmission lines or groups. Arithmetic average is used to calculate the line constant of the transmission line.

The current source source 160 is connected to two transmission lines each of which one end is grounded, and repeats the setting currents having a different size and having a phase angle of 0 ° through the controller 170 a plurality of times of setting times. Is authorized.

The controller 170 controls the ammeter 120 and the voltmeter 110 to measure the current value, the line voltage, and the ground voltage of each group at the same time.

The storage unit 180 accumulates and stores track constant calculation values calculated from the track constant calculation unit.

9 and 10 are flowcharts illustrating a transmission line measuring method according to FIG. 8.

9 and 10, in order to measure the transmission line constant, first, a plurality of transmission lines that are subject to line constant measurement are truncated (S200).

Configure a group of two transmission lines for a plurality of transmission lines, ground one end of each of the two transmission lines, connect the line constant measuring device to the grounded transmission line, and apply the set current through the current source source. (S210).

Here, the set current is applied with a set current having a specific size and a phase angle of 0 °.

Subsequently, an ammeter measures the current value flowing through the two transmission lines (S220).

Then, the line voltage between the two transmission lines and the ground voltage of each of the two transmission lines are measured by the voltmeter (S230).

Subsequently, the data correction unit calculates a correction voltage value correcting the influence of the induced voltage on the two transmission lines using the line voltage and the ground voltage measured in the step of measuring the voltage (S240).

The line constant calculation unit calculates the line constants for each of the plurality of transmission lines that are the targets of the line constant measurement using the current value measured in the step of measuring the correction voltage value and the current value calculated in the step of calculating the correction voltage value. To calculate.

Then, the line constant calculation unit calculates the line constant for each group by using the current value measured in the step of measuring the correction voltage value and the current value calculated in the step of calculating the correction voltage value (S250).

In addition, if all of the plurality of transmission lines that are subject to line constant measurement are measured (S260), and if not all of them are measured, the wirings of the remaining groups belonging to the line constant measurement target are replaced (S270), and the current values of each group and the line again. Repeat the procedure for measuring voltage and earth-to-earth voltages.

After that, if all the plurality of transmission lines have been measured, After calculating the line constants for each of the plurality of transmission lines for each group (S280), accumulate and store them (S290).

Then, in order to improve the transmission line line constant measurement accuracy, it is checked whether setting currents having different sizes are applied as many times as a plurality of setting times (S300).

At this time, when it is determined that the set currents having different sizes are not applied as many times as the number of times set, the current source source is controlled (S310) to apply the set currents having different phases and having a phase angle of 0 ° as many times as the set times. From step 210, the steps of measuring the current value, the line voltage, and the ground voltage for each group are repeated.

After that, if a set current having a different size is applied as many times as the number of times set, the arithmetic average of the line constant calculation values for each of the plurality of transmission lines accumulated and stored in step S290 is used to calculate the line constant of the line constant to be measured. Determine (S320).

11 and 12 are flowcharts illustrating a transmission line measuring method according to a third exemplary embodiment of the present invention.

11 and 12, in order to measure the transmission line constant, first, a plurality of transmission lines that are the targets of line constant measurement are truncated (S400).

Configure a group of two transmission lines for a plurality of transmission lines, ground one end of each of the two transmission lines, connect the line constant measuring device to the grounded transmission line, and apply the set current through the current source source. (S410).

Subsequently, the current value flowing through the two transmission lines is measured by an ammeter (S420).

In addition, the line voltage between the two transmission lines and the ground voltage of each of the two transmission lines are measured by the voltmeter (S430).

Subsequently, the data correction unit calculates a correction voltage value correcting the influence of the induced voltage on the two transmission lines by using the line voltage and the ground voltage measured in the step of measuring the voltage (S440).

The line constant calculation unit calculates the line constants for each of the plurality of transmission lines that are the targets of the line constant measurement using the current value measured in the step of measuring the correction voltage value and the current value calculated in the step of calculating the correction voltage value. To calculate (S450).

Then, the line constant calculation unit calculates one group line constant using the current value measured in the step of measuring the correction voltage value and the current value calculated in the step of calculating the correction voltage value (S450).

In addition, if all of the plurality of transmission lines that are the line constant measurement targets are measured (S460), and if not all of them are measured, the connection of the remaining groups belonging to the line constant measurement target is replaced (S470), and the current values of each group and the line again. Repeat the procedure for measuring voltage and earth-to-earth voltages.

Subsequently, when all of the plurality of transmission lines have been measured, the plurality of transmission line parameters for each group are calculated (S480), and then accumulatively stored (S490).

Then, in order to improve the transmission line line constant measurement accuracy, it is checked whether setting currents having different sizes are applied by the number of times of setting a plurality of times (S500).

Subsequently, when it is determined that the set currents having different sizes are not applied as many times as the number of times set, the current source source is controlled (S510) to apply the set currents having different phases and having a phase angle of 0 ° as many times as the set times. From the step S410, the steps of measuring the current value, the line voltage, and the ground voltage for each group are repeated.

Subsequently, if a set current having a different size is applied as many times as the number of times set, the arithmetic average of the line constant calculation values for each of the plurality of transmission line groups accumulated and stored in step S490 determines the line constant of the line constant to be measured. (S520).

Accordingly, the present invention calculates the line constant using voltage and current information in which the influence of the induced voltage is corrected by powering down a plurality of transmission lines, and arithmetic average improves the line constant measurement accuracy.

In addition, the present invention greatly affects the reliability and cost reduction of power system planning and operation, and prevents relay misoperation by applying to system protection fields such as relay correction and fault point expression, and system analysis such as bird calculation and fault calculation. It can be used in the field to prevent failures and reduce investment costs.

Although a preferred embodiment according to the present invention has been described above, it is possible to modify in various forms, and those skilled in the art to various modifications and modifications without departing from the claims of the present invention It is understood that it may be practiced.

Claims

A current source source connected to two transmission lines each of which one end is grounded to apply a set current;

An ammeter for measuring a current value flowing through the two transmission lines;

A voltmeter for measuring a line voltage, which is a voltage between the two transmission lines, and an earth voltage of each of the two transmission lines;

A data correction unit for calculating a correction voltage value correcting the influence of induced voltages on the two transmission lines using the line voltage measured by the voltmeter and the ground voltages;

And a line constant calculation unit configured to calculate a line constant for the line constant measurement targets including the two power transmission lines using the correction voltage value and the current value.
The method according to claim 1,

The line constant measurement objects are configured in groups of two transmission lines for a plurality of transmission lines, and measure a current value, line voltage, and ground voltage for each group so that the plurality of transmission lines can be measured. Transmission line track constant measuring device.
The method according to claim 1,

The voltmeter,

A first voltmeter module measuring a line voltage between the two transmission lines;

And a second voltmeter module and a third voltmeter module for measuring the inter-ground voltage of each of the two transmission lines.
The method according to claim 1,

The ammeter and the voltmeter are controlled to measure the current value, the line voltage, and the ground voltage at the same time, and the current source source is controlled so that a set current having a different magnitude is applied to the line constant measurement objects a plurality of times. Transmission line line constant measurement apparatus further comprises a control unit.
The method according to claim 1,

The current source source is,

A transmission line line constant measuring apparatus, characterized in that for applying the set current having different magnitudes and having a phase angle of 0 ° to the line constant measurement targets a plurality of times.
The method according to claim 1,

The line constant calculation unit,

Transmission line constant measurement device, characterized in that for calculating the line constant calculation value by applying a set current different in magnitude by a predetermined number of times to the line constant measurement target.
The method according to claim 1,

And an average calculation unit configured to calculate a track arithmetic average of track constant calculation values for the track constant measurement targets and calculate a track constant of a corresponding transmission line.
The method according to claim 1,

And a storage unit for accumulating and storing track constant calculation values calculated from the track constant calculation unit.
Applying, by a current source, one set end to each of the two transmission lines, each of which is grounded;

Measuring a current value flowing through the two transmission lines by an ammeter;

Measuring, by a voltmeter, the line voltage between the two transmission lines and the ground voltages of each of the two transmission lines;

Calculating, by a data correction unit, a correction voltage value correcting the influence of induced voltages on the two transmission lines using the line voltage and the ground voltage measured in the measuring of the voltage; And

Calculating a line constant for the line constant measurement objects including the two transmission lines by using the calculated correction voltage value and the measured current value by a line constant calculating unit. Transmission line measurement method.
The method according to claim 9,

The line constant measurement objects are configured in groups of two transmission lines for a plurality of transmission lines, and measure current values, line voltages, and ground voltages for each group so that the plurality of transmission lines can be measured. Transmission line line constant measurement method.
The method according to claim 9,

And controlling the ammeter and the voltmeter to measure the current value, the line voltage, and the ground voltage at the same time. 2.
The method according to claim 11,

In the controlling step,

Transmission line constant measurement method characterized in that for controlling the current source source so that the set current different in magnitude by the setting a plurality of times to the line constant measurement objects.
The method according to claim 9,

In the step of measuring the voltage,

Measuring the line voltage between the two transmission lines;

And measuring a voltage between grounds of each of the two transmission lines.
The method according to claim 9,

In the step of applying the set current,

A transmission line line constant measuring method, characterized in that for applying the set current having different magnitudes and having a phase angle of 0 ° to the line constant measurement targets a plurality of times.
The method according to claim 9,

The step of calculating the line constant

Transmission line constant measurement method, characterized in that for calculating the line constant calculation value by applying a set current different in magnitude by the number of times set to the line constant measurement target.
The method according to claim 9,

And calculating, by an averaging unit, arithmetic average of track constant calculation values for the track constant measurement targets, as a track constant of a corresponding power transmission line.
The method according to claim 9,

And storing and storing, by the storage unit, the line constant calculation values calculated from the line constant calculating unit.