KR20220118383A - Apparatus for locating distance of transmission line using fault data - Google Patents

Abstract

The present invention relates to a distance locating device of a power transmission line using fault data which comprises: a fault data input unit receiving fault data from a protection relay or a fault recording device; a control unit that analyzes the fault data to calculate a distance location for a fault point of a power transmission line; a fault waveform output unit outputting a fault waveform according to a result of analyzing the fault data in the control unit; and an analysis result output unit for outputting a result of analyzing the fault data by the control unit in a predetermined format.

Description

Apparatus for estimating the distance of a transmission line using failure data

The present invention relates to a distance expression device for a transmission line using failure data, and more particularly, by analyzing failure data stored in a protection relay to automatically calculate a distance expression for a failure point of a transmission line to improve accuracy It relates to a device for determining the distance of a transmission line using fault data.

In general, when a failure occurs in power equipment, the protective relay operates and the circuit breaker is opened to remove the failure.

At this time, the protection relay stores the fault data, and the fault data stores a plurality of information such as voltage, current, phase angle, breaker status, and internal logic contact of the protection relay at the time of the fault, and the fault data is or user), a dedicated viewer program is required for useful use.

Accordingly, conventionally, the person in charge accurately analyzes changes in voltage, current magnitude, and phase at the time of failure through a dedicated viewer program to determine the location and cause of the failure. In particular, when figuring out the location of a fault in the transmission line, check the distance expression information calculated through the calculation algorithm inside the transmission line protection relay, or the person in charge directly analyzes the fault data and calculates it manually and then confirms the fault location.

As described above, in the case of a power facility failure, the protection relay operates, and the failure recorder stores the data at the time of the failure. Accordingly, the person in charge acquires the fault data from the protection relay or fault recorder, determines whether the protection relay operates normally, and analyzes fault current and voltage, fault duration, fault cause, distance expression, and fault point resistance. (Ex: Dedicated viewer program operating system for failure data analysis). However, the existing dedicated viewer program for failure data analysis has a problem that it is difficult to access except an experienced person in charge because it is complicated to install and use.

Accordingly, it is equipped with essential functions used for failure analysis, and for precise failure analysis, calculations such as harmonic analysis, vector analysis, and power calculation are possible. situation in demand.

In addition, as a lot of underground lines have been recently built in large cities, many complex lines are being operated in which both overhead and underground lines are connected to one line. However, even if the overhead line and the underground line have the same length, the size of the intrinsic characteristic impedance is remarkably different depending on the type. Transmission line protection relay that detects the actual transmission line fault location and error. Therefore, in case of a complex line failure, the person in charge analyzes the voltage and current after acquiring the fault waveform and corrects the error through manual calculation.

Therefore, in order to improve the accuracy of the distance expression result, there is a need for a device and method that can automatically perform the distance expression compensation of the complex line.

In addition, there is a need for a device and method that can record the voltage and current of many lines at the same time and obtain the data of a fault recorder that is quicker and easier to connect than the existing ones and can express the distance to the fault point of the transmission line.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2019-0119378 (published on October 22, 2019, protection relay fault waveform data operation unit).

According to one aspect of the present invention, the present invention was created to solve the above problems, and it analyzes the failure data stored in the door relay and automatically calculates the distance expression for the failure point of the transmission line for accuracy. An object of the present invention is to provide an apparatus for determining the distance of a transmission line using fault data, which can improve

According to an aspect of the present invention, there is provided an apparatus for expressing a distance of a transmission line using failure data, comprising: a failure data input unit for receiving failure data from a protection relay or a failure recording device; a control unit that analyzes the failure data and calculates a distance expression for a failure point of the transmission line; a failure waveform output unit for outputting a failure waveform according to a result of analyzing the failure data by the control unit; and an analysis result output unit for outputting a result of analyzing the failure data in the control unit in a predetermined format.

In the present invention, the control unit is characterized in that at least one of harmonic analysis, vector analysis, and waveform synthesis analysis is performed using the failure data.

In the present invention, the controller applies a compensation factor to improve the distance expression error of the transmission line protection relay when a failure occurs in the complex line in which the overhead line and the underground line are mixed.

In the present invention, the controller calculates the compensation factor using Equation 1 below.

(Equation 1)

In the present invention, the distance expression device of the transmission line using the failure data is data necessary for calculating the distance expression for the failure point of the transmission line, and divides the transmission line impedance by line type and section, and It is characterized in that it is subdivided into reactance and zero resistance and reactance and managed through a database.

In the present invention, the control unit fetches the failure data and moves to a time point after a specified time immediately after the failure, selects the relevant business office and the failure voltage and current, then executes the distance expression, and converts the voltage and current into a real part and an imaginary part The impedance is calculated by dividing, and the final distance expression is performed after the reactance is extracted and the compensation factor is applied.

In the present invention, the control unit fetches and opens the failure data, and analyzes the instantaneous value, the rms value, the harmonic, vector analysis, the power value, and the time of the accident according to a preset calculation formula, and the calculation function related to the expression of the failure point is When activated, after the name of the headquarters related to the failure data and the corresponding database are called, the distance expression of the failure point is calculated for the designated transmission line and channel for calculating the distance expression of the failure point.

In the present invention, the control unit uses the total impedance and distance of the faulty transmission line, and fault impedance information, in order to calculate the fault point distance expression, wherein the total impedance information of the transmission line is, in advance, for each voltage, It is characterized in that it is managed in the form of a database for each section by dividing the transmission line distance and ship type information.

According to one aspect of the present invention, the present invention analyzes the failure data stored in the switchgear and automatically calculates the distance expression for the failure point of the transmission line to improve the accuracy.

1 is an exemplary diagram showing a schematic configuration of a distance expression device of a power transmission line using failure data according to an embodiment of the present invention.
FIG. 2 is an exemplary diagram illustrating a function of visualizing and formulating failure data according to an IEEE Comtrade format that is currently generally used according to an embodiment of the present invention; FIG.
3 is an exemplary diagram for explaining a function of selecting any one of a plurality of analog channels and displaying the graph on the screen in the present embodiment.
FIG. 4 is an exemplary diagram for explaining a function of displaying a graph for checking vectors and harmonics of a selected channel in FIG. 3;
5 is an exemplary diagram for explaining a PQ (Power Quality %) analysis function of a selected channel in FIG. 3 .
FIG. 6 is a flowchart for explaining a method of expressing a distance between a failure point of a power transmission line through a failure waveform analysis of a control unit in FIG. 1 .
7 is an exemplary view showing a national transmission line impedance database related to an embodiment of the present invention.
8 is an exemplary diagram illustrating a user interface screen for instructing calculation of a fault point distance expression according to an embodiment of the present invention;
9 is an exemplary view for comparing the distance expression result after compensation and the distance expression result before compensation in FIG. 1 .

Hereinafter, with reference to the accompanying drawings, an embodiment of the apparatus for determining the distance of a power transmission line using failure data according to the present invention will be described.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is an exemplary diagram showing a schematic configuration of a distance expression device for a power transmission line using failure data according to an embodiment of the present invention.

As shown in FIG. 1 , the distance expression device for a power transmission line using failure data according to the present embodiment includes a failure data input unit 110 , a control unit 120 , a failure waveform output unit 130 , and an analysis result output unit. (140).

The failure data input unit 110 communicates with a protection relay (not shown) to receive failure data.

The control unit 120 analyzes the received failure data.

The failure waveform output unit 130 outputs a failure waveform according to a result of analyzing the failure data by the control unit 120 .

The analysis result output unit 140 outputs a result of analyzing the failure data by the control unit 120 in a predetermined format.

Hereinafter, the operation of the control unit 120 will be described in more detail.

FIG. 2 is an exemplary view to explain the function of visualization and formulating of failure data according to the IEEE Comtrade (C37.111) format that is currently generally used according to an embodiment of the present invention.

The control unit 120 has a failure waveform viewer function that is compatible with all three versions of IEEE Comtrade (C37.111) accident data (ie, failure data) currently used, and as shown in FIG. , the sorting values listed therein are visually graphed (i.e., visualized), and the necessary data is formulated (i.e., formulated) and operated based on the designated program so that the person in charge can take immediate action and operate it on the spot. .

In addition, for precise failure analysis of power equipment, the control unit 120 performs functions such as harmonic analysis, vector analysis, and waveform synthesis analysis.

On the other hand, as previously disclosed as a problem, when a failure occurs in a complex line where overhead lines and underground lines are mixed, the distance expression error of the transmission line protection relay (eg 43% error) occurs considerably, and this error In order to improve, a compensation factor should be applied.

Although not shown in the drawing, it is assumed that the transmission line impedance is classified by line type and section (distance), etc., and managed by dividing it into positive resistance and reactance, zero resistance and reactance, etc., and a database.

Accordingly, the control unit 120 calls the fault waveform (ie, fault data) stored in the transmission line protection relay or fault recorder and moves to a time point after the specified time (eg, about 20 ms) immediately after the fault, and the relevant business office and fault voltage and After selecting the current, the distance expression is executed, the impedance is calculated by automatically dividing the voltage and current into the real part and the imaginary part, and the final distance expression is performed after the reactance is extracted and the compensation factor is applied.

For reference, the files of the Comtrade format (that is, the file format for oscilloscope data in the power system) are divided into '***.cfg' and '***.dat', but in this embodiment, Re-saved to the latest version to be compatible with the previous version.

In this embodiment, as shown in FIG. 3 , the controller 120 selectively selects any one channel (eg, a channel selected by the operator) among a plurality of analog channels (eg, voltage, current, etc.) on one screen. can be displayed graphically. Also, as shown in FIGS. 4 and 5 , the control unit 120 expresses apparent power, active power, reactive power, and power factor by a power calculation method using three-phase voltages and currents.

3 is an exemplary view for explaining a function of selecting any one of a plurality of analog channels and displaying them as a graph on the screen in the present embodiment, and FIG. 4 is a diagram for checking vectors and harmonics of the selected channel in FIG. 3 . It is an exemplary diagram for explaining a function of displaying a graph that can be used, and FIG. 5 is an exemplary diagram for explaining a PQ (Power Quality %) analysis function of a selected channel in FIG. 3 .

FIG. 6 is a flowchart for explaining a method of expressing a distance between a failure point of a power transmission line through a failure waveform analysis of a control unit in FIG. 1 .

Referring to FIG. 6 , the controller 120 calls and opens a failure waveform (ie, failure data) (eg, a COMTRADE file) ( S101 ).

Accordingly, the user can check the waveform that is basically displayed through the failure waveform output unit 130, and the control unit 120 presets an instantaneous value, an rms value, a harmonic, a vector analysis, a power value, and an accident time. Analyze according to the calculated formula (S102).

At this time, when the function related to the failure point expression is activated (Yes in S103), the control unit 120 selects the name of the headquarters related to the failure waveform (ie, failure data) (eg, COMTRADE file) to be analyzed and the corresponding database (not shown). to call (S104).

In addition, the control unit 120 selects (or receives a selection) the transmission line (T/L) for viewing the distance expression (Fault Location) of any one of the plurality of analog channels and the fault point (S105) fault point expression (or the distance expression of the failure point) and output the result (S106).

At this time, it is also possible to analyze other failure waveforms (example of S107).

If other failure waveforms are not analyzed (Yes in S107), the failure waveform (ie, failure data) analysis is finished.

As described above, for the transmission line distance expression (ie, the failure point distance expression of the transmission line), the total impedance and distance (or length) of the transmission line in which the failure occurs, and failure impedance information are required.

As shown in FIG. 7, the total impedance information of the transmission line is divided into voltage, transmission line distance (or length), and line type (eg, underground, overhead, etc.) in advance, input for each section, and a database. get angry 7 is an exemplary diagram illustrating a national transmission line impedance database according to an embodiment of the present invention.

At this time, in order to obtain the fault impedance, a fault waveform (ie, fault data) is acquired from a protection relay or fault recording device that operates when a transmission line fails.

Then, the control unit 120 calls and opens the acquired failure waveform (ie, failure data), and as shown in FIG. ) after moving to a later point in time, activating the distance expression function, and selecting the headquarters, substation, and line of the faulty power transmission line, as shown in FIG. 7, the impedance and The distance is extracted and waiting for the fault location calculation of the transmission line.

Also, as shown in (b) of FIG. 8, when three-phase current and voltage, and a failure type are selected for the selected headquarters, substation, and line, and a distance expression calculation command (button) is input, the failure impedance is automatically calculated Then, the calculated fault impedance is calculated once again by applying the distance expression compensation factor, and the extracted impedance for each transmission line section, the distance, and the distance expression result value to which the compensation factor is applied are output.

In this case, the compensation factor can be calculated using Equation 1 below.

9 is an exemplary view for comparing the distance expression result after compensation and the distance expression result before compensation in FIG. It can be seen that there is, and this difference means that the accuracy of the distance expression for the fault point of the transmission line is improved.

As described above, in this embodiment, a failure waveform (i.e., failure data) is acquired from a protective relay or a failure recorder, etc., away from a protection relay that has a possibility of generating an error in the distance expression of a transmission line failure point or a long time-consuming and complicated manual calculation. , Open the fault waveform and move the cursor to the fault location to automatically apply compensation factors to perform distance expression, so that anyone can use it easily without specialized knowledge, and harmonic analysis for more precise fault analysis Since detailed failure analysis is possible by adding various functions such as

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is merely an example, and various modifications and equivalent other embodiments are possible therefrom by those skilled in the art. will understand the point. Therefore, the technical protection scope of the present invention should be defined by the following claims. Implementations described herein may also be implemented as, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Although discussed only in the context of a single form of implementation (eg, discussed only as a method), implementations of the discussed features may also be implemented in other forms (eg, as an apparatus or program). The apparatus may be implemented in suitable hardware, software and firmware, and the like. A method may be implemented in an apparatus such as, for example, a processor, which generally refers to a computer, a microprocessor, a processing device, including an integrated circuit or programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants ("PDA") and other devices that facilitate communication of information between end-users.

110: failure data input unit
120: control unit
130: fault waveform output unit
140: analysis result output unit

Claims (1)

a fault data input unit for receiving fault data from a protection relay or fault recorder;
a control unit that analyzes the failure data and calculates a distance expression for a failure point of the transmission line;
a failure waveform output unit for outputting a failure waveform according to a result of analyzing the failure data by the control unit; and
and an analysis result output unit for outputting the result of analyzing the failure data in the control unit in a predetermined format;
The control unit is
Any one channel selected by the operator among a plurality of analog channels is selectively displayed on one screen as a graph, but a graph that can check the vector and harmonics of the selected channel is displayed, and the power calculation method using three-phase voltage and current to express apparent power, active power, reactive power and power factor, and
The control unit is
Call the fault data and select the relevant office and fault voltage and current from a time point after the specified time immediately after the fault, and then execute the distance expression, divide the fault voltage and current into a real part and an imaginary part to calculate the impedance, and also reactance After extracting and applying the compensation factor, the final distance expression is performed,
The time point, business location, and fault voltage and current are specified in advance or are implemented to be specified by the user, and
The control unit is
When a failure occurs in a complex line where overhead lines and underground lines are mixed, a compensation factor is applied to improve the distance expression error of the transmission line protection relay.
The control unit is
Calculate the compensation factor using Equation 1 below, and
The control unit is
To calculate the fault point distance expression, the total impedance and distance of the faulty transmission line, and fault impedance information are used,
The total impedance information of the transmission line is a distance expression apparatus for a transmission line using fault data, characterized in that it is managed in the form of a database for each section by dividing information by voltage, transmission line distance, and line type in advance.
(Equation 1)

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