KR101905767B1 - Apparatus for determining faults of line - Google Patents

Abstract

According to an embodiment of the present invention, provided is an apparatus for determining a fault of a line which comprises: a signal input unit for mixing signals with first, second, and third frequency components to inject the mixed signals into an aluminum conductor steel reinforced (ACSR); a signal measurement unit for measuring a voltage value and a current value of a signal applied to the ACSR; a calculation unit for calculating a size value, a phase value, and a reactance value of an impedance on each frequency component signal by analyzing the voltage value and the current value measured by the signal measurement unit to extract a voltage component value for each frequency and a current component value for each frequency; and a fault determination unit for determining whether a fault is present according to an inner configuration of the ACSR by using a change rate of the size value, the phase value, and the reactance value of the impedance.

Description

[0001] APPARATUS FOR DETERMINING FAULTS OF LINE [0002]

One embodiment of the present invention relates to a line abnormality determination apparatus, and more particularly, to a line abnormality determination apparatus that can be applied to a radial aluminum strand used as a transmission line.

Today, cables are complex and diverse, ranging from high-speed Internet and telecommunication cables to aircraft and space launch vehicles. Non-destructive Testing (NDT) is used to determine abnormal conditions such as corrosion and burnout inside the cable such as infrared ray and X-ray because it is impossible to visually check if corrosion or burnout occurs inside the cable .

For example, in the case of an ACSR (Aluminum Conductor Steel Reinforced) cable, the outermost aluminum layer, the middle galvanized layer, and the innermost steel wire layer are made of non-magnetic aluminum wire. The change in the aluminum cross section changes only the imaginary part of the output voltage. However, since the resistance and the inductance of the galvanized and the steel wire are simultaneously changed, the output voltage is changed in the real part and the imaginary part simultaneously.

However, there is a problem in that it is impossible to judge the degree of wire corrosion and wire corrosion due to the material and depth of the aluminum wire in the conventional method.

An object of the present invention is to provide a line abnormality determining apparatus capable of distinguishing corrosion and wire line degree according to material and depth of a transmission line.

According to an embodiment of the present invention, a signal input unit for mixing signals of a first frequency component, a second frequency component, and a third frequency component into an ACSR; A signal measuring unit measuring a voltage value and a current value of a signal applied to the stranded aluminum strand; A calculating unit for analyzing the voltage value and the current value measured by the signal measuring unit and extracting a voltage component value and a current component value for each frequency to calculate a magnitude value, a phase value, and a reactance value of an impedance for each frequency component signal; And an abnormality determination unit for determining an abnormality according to the inner configuration of the stratified aluminum strand using the magnitude value of the impedance, the phase value, and the rate of change of the reactance value.

The signal measuring unit may include a sensing coil, a sensing resistor, a first voltage measurement unit connected in parallel to both ends of the sensing coil, and a second voltage measurement unit connected in parallel to the sensing resistance.

The operation unit may calculate a magnitude value, a phase value, and a reactance value of the impedance for each frequency component signal using Fast Fourier Transform (FFT).

Wherein the operation unit comprises: an amplifier for amplifying a voltage value and a current value measured by the signal measuring unit; An analog-to-digital converter for sampling the amplified signal; A fast Fourier transformer for extracting a voltage component value and a current component value for a first frequency component, a second frequency component, and a third frequency component with respect to a sampled signal through a fast Fourier transform; And a processor for calculating a magnitude value, a phase value and a reactance value of the frequency-dependent impedance using the voltage component value and the current component value for the first frequency component, the second frequency component and the third frequency component, have.

The abnormality determination unit can determine that an abnormality has occurred when the magnitude value of the impedance, the phase value, and the rate of change of the reactance value are out of the change rate set value range.

The stranded aluminum strand may comprise an outermost aluminum layer, an intermediate galvanized layer, and a most interior steel wire layer.

The first frequency component signal may be a signal of a frequency band of 100 Hz to 9 kHz, the second frequency component signal may be a signal of a frequency band of 10 kHz to 99 KHz, and the third frequency component signal may be a signal of a frequency band of 100 kHz to 500 kHz.

Wherein the abnormality determination unit determines whether or not the innermost lumen strand layer is abnormal by using a magnitude value, a phase value, and a change rate of a reactance value of an impedance with respect to the first frequency component signal band, Determining a state of abnormality of the intermediate zinc plated layer by using a magnitude value, a phase value, and a rate of change of a reactance value of the first frequency component signal band, It is possible to judge whether or not the outermost aluminum layer is abnormal.

The line abnormality determination apparatus of the present invention can judge corrosion and wire line degree according to the material and depth of the transmission line.

1 is a block diagram of a line abnormality determination apparatus according to an embodiment of the present invention;
2 is a schematic diagram of a line abnormality determination apparatus according to an embodiment of the present invention.
FIG. 3 is a conceptual view of a stranded aluminum strand according to an embodiment of the present invention, FIG.
4 is a diagram for explaining an operation of the line abnormality determination apparatus 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 block diagram of a line abnormality determination apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a line abnormality determination apparatus according to an embodiment of the present invention. FIG. 4 is a view for explaining the operation of the line abnormality determination apparatus according to an embodiment of the present invention.

1 to 4, a line abnormality determination apparatus 1 according to an embodiment of the present invention includes a signal input unit 100, a signal measurement unit 200, an operation unit 300, and an abnormality determination unit 400 And the like.

The signal input unit 100 may mix signals of the first frequency component, the second frequency component, and the third frequency component into the ACSR.

The signal input unit 100 includes a first frequency oscillator 110 for outputting a first frequency component signal, a second frequency oscillator 120 for outputting a second frequency component signal, a third frequency oscillator 130, and a mixer 140 for mixing signals of the first frequency component, the second frequency component, and the third frequency component.

The first frequency component signal may be a signal in a band of 100 Hz to 9 kHz, the second frequency component signal may be a signal in a band of 10 kHz to 99 kHz, and the third frequency component signal may be a signal in a band of 100 kHz to 500 kHz.

Each frequency component signal can be injected up to 200mA.

And in the case of the hard steel aluminum strand 10, the outermost aluminum layer 11, the intermediate galvanized layer 12, and the innermost steel wire layer 13. The first frequency component signal can be injected up to the stranded wire layer 13 located at the innermost corner of the superabsorbent aluminum strand 10 with a signal of a low frequency band of 100 Hz to 9 kHz and the second frequency component signal can be injected into a signal of the band of 10 kHz to 99 kHz And the third frequency component signal can be injected into the aluminum layer 11 located at the outermost edge of the stranded aluminum strand with a high frequency signal in the 100 kHz to 500 kHz band .

The change in cross-sectional area of the strand of the aluminum layer 11, which is a nonmagnetic material, is represented by an inductance change in the third frequency component signal, and the change in cross-sectional area of the strand of the zinc plated layer 12 is caused by a change in resistance and inductance in the second frequency- 13) may appear as a change in resistance and inductance in the first frequency component signal.

The signal measuring unit 200 can measure a voltage value and a current value of a signal applied to the stranded aluminum strand 10.

The signal measuring unit 200 includes a sensing coil 210, a sensing resistor 220, a first voltage measuring unit 230 connected in parallel with the sensing coil 220, and a second voltage measuring unit 240 connected in parallel with the sensing resistor 210, As shown in FIG.

The signal measuring unit 200 may be disposed at a specific point of the stranded aluminum strand 10 to be measured and measures the voltage across the sensing coil 210 through the first voltage measuring unit 230, The voltage across the sensing resistor 220 is measured through the resistor 240.

The sensing coil 210 may be a multi-layer type split-through sensor, and may be a sensor head structure capable of being detached from a transmission line. In addition, the multi-layer type penetration type sensor can be formed in a multilayered coil shape in order to increase sensor sensitivity.

The sensing resistor 220 may be a general resistance element and the resistance value is stored in the calculator 300 so that the current value can be calculated using the voltage value measured across the sensing resistor 220.

The operation unit 300 analyzes the voltage value and the current value measured by the signal measurement unit 200 and extracts voltage component values and current component values for each frequency and outputs a magnitude value, a phase value, and a reactance value of the impedance for each frequency component signal. Value can be calculated.

The operation unit 300 can calculate the magnitude value, the phase value, and the reactance value of the impedance for each frequency component signal using, for example, Fast Fourier Transform (FFT).

The operation unit 300 may include an amplifier 310, an analog-to-digital converter 320, a fast Fourier transformer 330, and a processor 340.

The amplifier 310 may amplify the voltage value and the current value measured by the signal measuring unit. The amplifier 310 includes a first amplifier 311 for amplifying a voltage measured by the signal measuring unit 200 and a second amplifier 312 for amplifying a current value measured by the signal measuring unit 200 .

The analog-to-digital converter 320 may sample the amplified signal from the amplifier 310. The analog-to-digital converter 320 may sample the amplified signal at a sampling rate of, for example, 1024 samples / cycle. The analog-to-digital converter 320 includes a first analog-to-digital converter 321 for sampling the amplified signal from the first amplifier 311 and a second analog-to-digital converter 322 for sampling the amplified signal from the second amplifier 312. [ Digital converter 322, as shown in FIG.

The fast Fourier transformer 330 can extract a voltage component value and a current component value for the first frequency component, the second frequency component, and the third frequency component with respect to the sampled signal through the fast Fourier transform. A first fast Fourier transformer 331 for extracting a voltage component value for a first frequency component, a second frequency component and a third frequency component, and a second fast Fourier transformer 332 for extracting a first frequency component, a second frequency component, And a second fast Fourier transformer 332 for extracting a current component value for the second fast Fourier transformer 332.

The processor 340 may calculate a magnitude value, a phase value, and a reactance value of the frequency-dependent impedance by using the voltage component value and the current component value for the first frequency component, the second frequency component, and the third frequency component.

The processor 340 may calculate a magnitude value, a phase value, and a reactance value of the impedance for each frequency according to the following equations (1) to (5), for example.

 [Equation 1]

&Quot; (2) "

&Quot; (3) "

&Quot; (4) "

&Quot; (5) "

The equation is 1 to the sampling rate (sampling rate) in 5 1024sample / cycle, V (t) is a frequency-voltage component value, I _s (t) is a current component by the frequency value, V _amp is a voltage magnitude, I _amp Is the magnitude of the current, f is the frequency, t is the time, Z is the magnitude of the impedance, θ is the phase value, and L is the reactance value.

The abnormality determiner 400 can determine whether the abnormality is caused by the internal structure of the radial aluminum strand using the magnitude value of the impedance, the phase value, and the rate of change of the reactance value.

It can be determined that an abnormality has occurred when the magnitude value of the impedance, the phase value, and the rate of change of the reactance value are out of the change rate set value range. The set value range may be data in which corrosion and burning rate, impedance and reactance variation values determined through inspection of corrosion or burned wire samples are previously mapped and stored.

The abnormality determination unit 400 determines whether or not the most inner circumferential steel wire layer is abnormal by using the magnitude value, the phase value, and the rate of change of the reactance value of the impedance for the first frequency component signal band, And the rate of change of the reactance value is used to determine whether the intermediate galvanized layer is abnormal or not by using the magnitude value of the impedance, the phase value, and the rate of change of the reactance value, It is possible to judge whether or not the layer is abnormal.

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

100: Signal input section
200: Signal measurement unit
300:
400: abnormal judgment unit

Claims (8)

A signal input unit for mixing signals of a first frequency component in a frequency band of 100 Hz to 9 kHz, a second frequency component in a frequency band of 10 kHz to 99 KHz, and a third frequency component in a frequency band of 100 kHz to 500 kHz into an ACSR;
A signal measuring unit measuring a voltage value and a current value of a signal applied to the stranded aluminum strand;
A calculating unit for analyzing the voltage value and the current value measured by the signal measuring unit and extracting a voltage component value and a current component value for each frequency to calculate a magnitude value, a phase value, and a reactance value of an impedance for each frequency component signal; And
And an abnormality determination unit for determining an abnormality according to the inner configuration of the superconducting aluminum strand using the magnitude value, the phase value, and the rate of change of the reactance value of the impedance,
The signal measuring unit includes a sensing coil, a sensing resistor, a first voltage measuring unit connected in parallel at both ends of the sensing coil to measure a voltage across the sensing coil, and a voltage measuring unit connected in parallel at both ends of the sensing resistor, And a second voltage measuring unit,
The abnormality determination unit
Determining an abnormality of the innermost liner layer by measuring a change in resistance and inductance in the innermost liner layer using the magnitude value, the phase value and the rate of change of the reactance value with respect to the first frequency component signal band,
Determining an abnormality in the intermediate zinc plating layer by measuring resistance and inductance change in the intermediate zinc plating layer using a magnitude value, an impedance value and a rate of change of reactance value of the impedance for the second frequency component signal band,
Determining whether an abnormality has occurred in the outermost aluminum layer by measuring a change in inductance in the outermost aluminum layer using a magnitude value of the impedance, a phase value, and a change rate of the reactance value with respect to the third frequency component signal band; Device. delete The method according to claim 1,
Wherein the operation unit calculates a magnitude value, a phase value, and a reactance value of an impedance for each frequency component signal using Fast Fourier Transform (FFT). The method of claim 3,
The operation unit,
An amplifier for amplifying a voltage value and a current value measured by the signal measuring unit;
An analog-to-digital converter for sampling the amplified signal;
A fast Fourier transformer for extracting a voltage component value and a current component value for a first frequency component, a second frequency component, and a third frequency component with respect to a sampled signal through a fast Fourier transform; And
And a processor for calculating a magnitude value, a phase value, and a reactance value of the frequency-dependent impedance using the voltage component value and the current component value for the first frequency component, the second frequency component, and the third frequency component, . The method according to claim 1,
Wherein the abnormality determination unit determines that an abnormality has occurred when the magnitude value of the impedance, the phase value, and the rate of change of the reactance value are out of the change rate set value range. delete delete delete

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