KR101462231B1 - Intelligent electronic device and method for detecting line to ground fault location using the same - Google Patents

Abstract

Disclosed are an intelligent electronic device and a method for determining a ground fault point using the same. The intelligent electronic device, which is provided to detect a fault section by a mutual communication when a ground fault is detected and to transmit a control command to separate the fault section to a protection device, comprises: a signal generating unit to transmit a waveform signal to a line of a fault section direction after the fault section is separated; a signal detecting unit to detect the waveform signal viewed from an input terminal; a database to store a matching table to correspond current waveform data according to a line length; a waveform searching unit to search for a current waveform signal detected by the signal detecting unit in the matching table; and a fault point determining unit to determine a ground fault point by extracting the line length corresponding to the current waveform data searched by the waveform searching unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an intelligent electronic device and a method for determining ground fault strength using the intelligent electronic device.

The present invention relates to an intelligent electronic device and a method for determining ground fault strength using the same, and more particularly, to an intelligent electronic device that can be applied to a transmission and distribution line of an extra high voltage distribution system and a ground fault strength determination method using the same.

A ground fault is a fault that may cause an accident such as electric shock, electric shock or damage of the equipment due to leakage of current to the outside of the line due to ground fault. Ground fault can be caused by aged deterioration of insulator, physical damage by mechanical shock or insulation puncture, deterioration due to extreme transient voltage shock or normal voltage, and ground fault due to expansion of short circuit accident.

In the event of a ground fault, it is necessary to quickly and accurately locate the point and recover it.

Currently, a high-strength detection method for calculating the distance to a fault point in the event of a ground fault on a transmission / distribution line has been actively studied. The transmission system is a three-phase balanced circuit. High accuracy detection methods such as a method using a harmonic component and an apparent impedance method using a fundamental wave component of a voltage and a current have been proposed. In the current transmission system, a high-strength detection device has been widely used.

An object of the present invention is to provide an intelligent electronic device capable of quickly and accurately detecting a ground fault point through a simple matching process in accordance with matching of a current waveform when a ground fault occurs in a transmission and distribution line, And to provide a judgment method.

According to an aspect of the present invention, there is provided an intelligent electronic device for detecting a fault section by mutual communication when a ground fault is detected and transmitting a control command for separating a fault section into a protective device, A signal generator for generating a waveform signal; A signal detector for detecting the waveform signal viewed from an input terminal;

A database storing a matching table in which current waveform data is associated with a line length; A waveform searching unit for searching the matching table for the current waveform signal detected by the signal detecting unit; And a high-strength determination unit for determining a ground fault point by extracting a line length corresponding to the current waveform data retrieved from the waveform search unit.

The signal generator may transmit an impulse voltage signal.

The matching table may store the current waveform data for each line length according to the same impedance characteristic as the line in which the intelligent electronic device is installed.

The matching table may store the current waveform data according to a predetermined length.

The matching table may store the current waveform data according to a length of 5 meters or less.

The current waveform signal may be detected as a waveform different depending on the line length.

A method of determining ground fault strength of an intelligent electronic device for detecting a fault section by mutual communication when detecting a ground fault and transmitting a control command for isolating a fault section to a protective device, Transmitting a current waveform signal to a line of the first antenna; Detecting the current waveform signal from the input terminal of the signal detector; A database storing a matching table in which current waveform data is associated with a line length; Retrieving a current waveform signal detected by the waveform detector from a matching table stored in a database; And a high-strength determining unit extracting a line length corresponding to the current waveform data retrieved from the waveform searching unit to determine a ground fault point, wherein the matching table is configured to correspond to the line length And the current waveform data is stored.

The intelligent electronic device and ground fault strength determination method according to the present invention can quickly and accurately detect a ground fault point by performing a simple matching process without complicated calculation according to matching of a current waveform when a ground fault occurs in a transmission and distribution line.

FIG. 1 is a view for explaining a transmission / distribution line equipped with an intelligent electronic device according to an embodiment of the present invention;
2 is a block diagram of an intelligent electronic device according to an embodiment of the present invention;
3 is a diagram for explaining an experiment for generating a matching table according to an embodiment of the present invention;
4 is a diagram for explaining a method for determining a ground fault fault point according to an embodiment of the present invention;
5 is a diagram illustrating a portion of a matching table according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 1 is a view for explaining a transmission / distribution line equipped with an intelligent electronic device according to an embodiment of the present invention.

Referring to FIG. 1, the intelligent electronic devices 10 to 30 according to an embodiment of the present invention are installed at predetermined intervals on a transmission / distribution line, and can perform mutual data communication. The intelligent electronic devices 10 to 30 can detect a ground fault by performing mutual communication when a ground fault occurs on a transmission / distribution line, and send a control command to the protection device at the lower end to separate the ground fault section.

2 is a block diagram of the configuration of an intelligent electronic device according to an embodiment of the present invention.

The intelligent electronic device according to an embodiment of the present invention may include a signal generator 110, a signal detector 120, a database 130, a waveform detector 140, have.

The intelligent electronic device 100 according to an embodiment of the present invention is provided on a transmission / distribution line to detect a fault section by mutual communication when a ground fault is detected, and to control a control section (not shown) Lt; / RTI >

The line-to-line voltage of the transmission / distribution line is, for example, 22.9 kV and the phase voltage is 13.22 kV.

The signal generating unit 110 can send a waveform signal to the line in the fault section direction after the fault section is separated.

The signal generating unit 110 can transmit, for example, the impulse voltage signal to the line in the fault section direction.

The signal detector 120 can detect a waveform signal viewed from an input terminal. The signal detection unit 120 can detect the waveform signal at the input terminal looking in the direction of the failure section on the intelligent electronic device side where the impulse voltage signal is generated.

The waveform signal detected by the signal detector 120 is a current waveform signal determined by the relationship between the impulse voltage signal and the line impedance determined by the line length up to the fault section.

The current waveform signal detected by the signal detecting unit 120 is determined by the following equation.

Here, I is a current waveform signal, V is an impulse voltage signal, and Z is a line impedance.

The impedance Z of the transmission line in which the termination is short-circuited can be determined by the following equation.

[Mathematical Expression]

Here,? Is a wavelength and Z ₀ is a characteristic impedance of the transmission line.

Therefore, since the line impedance Z varies with L and I is inversely proportional to the line impedance, the signal detector 120 can detect a different current waveform according to the line length.

In the database 130, a matching table in which the current waveform data is associated with the line length can be stored.

The matching table may store current waveform data for each length of the line having the same impedance characteristic as the line in which the intelligent electronic device 100 is installed.

In the matching table, the current waveform data can be divided and stored according to a certain length, for example, divided into a length of 5 meters or less.

The matching table can be generated, for example, by experimental results.

FIG. 3 is a diagram for explaining an experiment for generating a matching table according to an embodiment of the present invention.

Referring to FIG. 3, the cable 40 has the same impedance characteristics as the transmission / distribution line equipped with the intelligent electronic device, and the waveform signal entering the input terminal is the same as the waveform signal generated by the signal generator of the intelligent electronic device.

The output terminal of the cable 40 is grounded, and the waveform L is transmitted to the input terminal while changing the length L of the cable, and the current waveform signal corresponding thereto is detected.

The detected waveform signal is stored in the matching table in correspondence with the length L of the cable.

Referring back to FIG. 2, the waveform searching unit can search the matching table for the current waveform signal detected by the signal detecting unit.

The waveform searching unit 140 searches the matching table for the current waveform data similar to the current waveform signal detected by the signal detecting unit 120, and the degree of similarity is determined within a predetermined error range taking into consideration factors such as noise, temperature, Can be set.

The high-strength determining unit 150 may determine a ground fault point by extracting a line length corresponding to the current waveform data retrieved from the waveform searching unit 140. [

The high strength decision unit 150 can determine that a ground fault has occurred at a location distant by the line length corresponding to the current waveform data retrieved from the waveform search unit in the direction of the ground fault region from the point where the intelligent electronic device 100 is installed have.

FIG. 4 is a diagram for explaining a method for determining a failure point of a ground fault according to an embodiment of the present invention, and FIG. 5 is a diagram illustrating a portion of a matching table according to an embodiment of the present invention.

Referring to FIGS. 4 and 5, when a ground fault occurs between the intelligent electronic device # 1 1000 and the intelligent electronic device 2000, the intelligent electronic device # 1 1000 and the intelligent electronic device # Detects a fault section by communicating with each other, and transmits a control command to the protective device to separate the fault section.

The intelligent electronic device # 1 (1000) transmits a waveform signal in a direction in which a ground fault occurs, and detects a waveform signal viewed from an input terminal.

The intelligent electronic device # 1 (1000) searches the matching table stored in the database for the detected waveform signal.

The intelligent electronic device # 1 (1000) extracts the line length corresponding to the searched current waveform data, and determines that a ground fault has occurred at a distance separated by the extracted length in the fault section direction.

Referring to FIG. 5, current waveform data A to J correspond to each other at a line length of 5 meters.

For example, when the current waveform data most similar to the detected waveform signal is D, the intelligent electronic device # 1 can determine that a ground fault has occurred at a point 20 meters away from the line corresponding to the searched current waveform data.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

10, 20, 30, 100, 1000, 2000: intelligent electronic device
40: Cable
110: Signal generator
120:
130: Database
140: Waveform search unit
150:

Claims (7)

An intelligent electronic device for detecting a fault section by mutual communication when a ground fault is detected and transmitting a control command for separating a fault section into a protective device,
A signal generator for sending a waveform signal to a line in the fault section direction after the fault section is separated;
A signal detector for detecting the waveform signal viewed from an input terminal;
A database storing a matching table in which current waveform data is associated with a line length;
A waveform searching unit for searching the matching table for the current waveform signal detected by the signal detecting unit; And
And a high-strength determination unit for determining a ground fault point by extracting a line length corresponding to the current waveform data retrieved from the waveform search unit.
The method according to claim 1,
Wherein the signal generator sends an impulse voltage signal.
The method according to claim 1,
Wherein said matching table stores current waveform data for each line length according to the same impedance characteristic as that of a line in which an intelligent electronic device is installed.
The method according to claim 1,
Wherein the matching table stores the current waveform data according to a predetermined length.
5. The method of claim 4,
And the matching table stores the current waveform data by dividing the current waveform data according to a length of 5 meters or less.
The method according to claim 1,
Wherein the current waveform signal is detected as a waveform different according to the line length.
A ground fault strength determination method of an intelligent electronic device for detecting a fault section by mutual communication when a ground fault is detected and transmitting a control command for isolating a fault section to a protective device,
A signal generator sending a current waveform signal to a line in a fault section direction after a fault section is separated;
Detecting the current waveform signal from the input terminal of the signal detector;
A database storing a matching table in which current waveform data is associated with a line length;
Retrieving a current waveform signal detected by the waveform detector from a matching table stored in a database; And
And a high-strength determining unit extracting a line length corresponding to the current waveform data retrieved from the waveform retrieving unit to determine a ground fault point,
And the matching table stores current waveform data corresponding to the line length.

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