KR101743531B1 - Apparatus for detecting serial arc using high frequency and method thereof - Google Patents

Apparatus for detecting serial arc using high frequency and method thereof Download PDF

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Publication number
KR101743531B1
KR101743531B1 KR1020150107118A KR20150107118A KR101743531B1 KR 101743531 B1 KR101743531 B1 KR 101743531B1 KR 1020150107118 A KR1020150107118 A KR 1020150107118A KR 20150107118 A KR20150107118 A KR 20150107118A KR 101743531 B1 KR101743531 B1 KR 101743531B1
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South Korea
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signal
arc
current signal
current
impulse
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KR1020150107118A
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Korean (ko)
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KR20170015595A (en
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방선배
이기연
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한국 전기안전공사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The present technique discloses an apparatus and method for detecting a series arc. According to a specific example of the present invention, detection based on a comparison result of an output signal of a commercial power supply current sensor with an impulse-shaped arc signal having an instantaneous power peak value with respect to a current signal of a high- Counting the number of occurrences of the arc signal for each predetermined period and counting the number of occurrences of the arc signal when the number of occurrences of the arc signal reaches a predetermined reference value, determining whether an arc fault has occurred and outputting a trip signal for driving the cable- As a result, it is possible to maximize the reliability of the determination result of the arc failure, and to fundamentally prevent the electrical damage due to the arc.

Description

Field of the Invention [0001] The present invention relates to a serial arc detection apparatus and method,

Field of the Invention [0003] The present invention relates to an apparatus and method for detecting a series arc, and more particularly, to a technique for detecting a series arc occurrence accurately based on a current signal of a high frequency component connected to a cable wire.

Cables in switchboards in certain areas, such as urban, industrial or commercial areas, can suffer from a variety of causes, such as thermal degradation, aging, moisture or damage by animals such as rats or squirrels.

In order to prevent fire or electric shock accidents from these causes, we use wiring breakers and earth leakage breakers at home.

However, despite the fact that such circuit breakers and earth leakage breakers are installed, many fires occur annually worldwide because arcing type faults occur more frequently. Since such an arc defect generates a current having a low current and high impedance and an average root mean square (RMS) below a thermal threshold value of the circuit breaker, the cable disconnecting device including the circuit breaker and the leakage current breaker Becomes unresponsive to defects, and thus a fire often occurs.

The causes of such arc defects vary widely, for example, aging, insulation and wiring breakdown, mechanical and electrical stresses due to excessive or overcurrent, connection defects, and excessive mechanical damage to insulation and wiring.

In addition, the arc current and arc voltage are not generally sinusoidal, and they arise from various types of voltage and current waveforms depending on the type of arc. The arc voltage and the arc current are generated by an electric motor such as a home fan or a dryer This is because it has characteristics similar to pulses generated when various electric devices such as home appliances are started.

Therefore, it is more difficult to detect the arc because the output voltage when the arc is generated and the pulse voltage generated when the electric device is started are similar.

In addition, the conventional overcurrent breaker and the leakage breaker have a limitation in that they can not perform the function of disconnecting the cable since a current lower than the operating current flows when a series arc or a contact failure occurs in a normal load.

Therefore, in the present invention, an arc fault is accurately determined by comparing an arc signal having an instantaneous power peak value detected from a current signal of a high frequency component flowing through a cable to a cable line and an output signal of a used power source current sensor, And a trip signal is generated at the time of judgment to prevent electric damage due to an arc failure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a serial arc detection method capable of improving the reliability of a product by fundamentally improving the accuracy of an arc fault determination by performing serial arc detection from a current signal of a high frequency component flowing through a cable, Apparatus, and method.

It is another object of the present invention to provide a serial arc detecting apparatus and method that can generate a trip signal when an arc fault is determined and prevent electrical damage due to a harmful arc fault.

According to an aspect of the present invention, there is provided a series arc detecting apparatus using a high frequency, comprising: a current detecting unit connected to a cable line to detect a current signal of a high frequency component flowing in a wire; A signal processor for filtering and amplifying a noise component included in the detected current signal to output a current signal of an impulse waveform having an instantaneous power peak value; And a control unit for determining whether an arc fault has occurred based on a current signal of an impulse waveform having an instantaneous power peak value and an output signal of the power source current sensor, wherein the signal processor filters the noise component included in the detected current signal An impedance matching module for outputting a current signal of a predetermined frequency band; A first RF amplifying module for amplifying a positive component of a rectangular-wave-shaped current signal of the impedance matching module; A peak detection module for outputting an impulse-shaped current signal having an instantaneous power peak value from the amplified current signal; And a second RF amplifying module for amplifying a negative component of a current signal having passed through the peak detecting module, wherein the controller is connected to a cable line in consideration of repetitive generation of an arc signal, The number of occurrences of the arc signal and the number of occurrences of no arc signal detected based on the comparison result between the impulse type arc signal having the instantaneous power peak value for the signal and the output signal of the commercial power source current sensor are counted for a predetermined period And determining whether an arc fault has occurred when the counted number of arc signals has reached a predetermined reference value.

According to another aspect of the present invention, there is provided a method of detecting a series arc, comprising the steps of: (a) detecting a current signal of a high frequency component flowing in a wire by connecting a cable to a cable in a current detecting unit; (B) filtering the noise component included in the current signal detected by the signal processing unit, positively amplifying the noise component, and detecting a current signal having an instantaneous power peak value from the amplified current signal; And determining whether an arc fault has occurred based on the number of arc signal occurrences of the arc signal detected based on the comparison result between the current signal which is an impulse waveform having an instantaneous power peak value in the control section and the output signal of the commercial power source current sensor Wherein the step (b) includes filtering the noise component included in the detected current signal to output a current signal of a predetermined frequency band, and outputting a positive component of the square-wave-shaped current signal of the impedance matching module And outputting an impulse-shaped current signal having an instantaneous power peak value from the amplified current signal and amplifying a negative component of the current signal having passed through the peak detecting module, wherein the step (c) Considering the repetitive generation of the signal, it is connected to the cable wire and the high frequency component current signal Counts the number of occurrences of the detected arc signal and the number of non-occurrences of the arc signal based on the comparison result of the impulse type arc signal having the instantaneous power peak value and the output signal of the commercial power source current sensor for a predetermined period, And to determine whether an arc fault has occurred when the number of arc signal generations reaches a predetermined reference value


Preferably, the step (c) includes the steps of: (c-1) counting the number of current signals of an impulse-type waveform having an instantaneous power peak value received at a pre-stored period for a predetermined number of cycles, ; And (c-2) generating a trip signal by determining that an arc fault has occurred when the count value of the arc signal occurrence count reaches a predetermined determination reference value.

According to the present invention, an arc signal of an impulse type having an instant power peak value with respect to a current signal of a high-frequency component flowing in a wire, connected to a cable wire in consideration of repetitive generation of an arc signal, The number of occurrences of the arc signal detected and the number of occurrences of the arc signal not occurring based on the comparison result of the signals are counted for each predetermined period in a predetermined period, and when the number of occurrences of the arc signal reaches a predetermined reference value, The accuracy of the arc detection is fundamentally improved and the reliability of the product can be improved.

In addition, according to the present invention, a trip signal is generated when a harmful arc is detected, thereby preventing an accident such as a fire due to a harmful arc.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
1 is a diagram illustrating a configuration of a tandem arc detecting apparatus according to an embodiment of the present invention.
2 is a view showing a detailed configuration of a tandem arc detecting apparatus according to an embodiment of the present invention.
3 is a waveform diagram showing signals output from the respective units of the series arc detecting apparatus according to the embodiment of the present invention.
4 is a waveform diagram showing a trip signal output from the controller of the series arc detecting apparatus according to the embodiment of the present invention.
5 is a flowchart illustrating a series arc detection process using a high frequency according to another embodiment of the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It should be interpreted in terms of meaning and concept. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

FIG. 1 is a view showing a configuration of a series arc detection device using high frequency according to an embodiment of the present invention, FIG. 2 is a diagram showing a detailed configuration of a series arc detection device using a high frequency shown in FIG. 1, FIG. 4 is a waveform diagram showing the trip signal shown in FIG. 1. FIG. 4 is a waveform diagram showing a signal output from each part of the serial arc detecting device using the high frequency shown in FIG.

The arc detecting apparatus according to the present invention is connected to a cable wire in consideration of repetitive generation of an arc signal and generates an arc signal of an impulse type having an instantaneous power peak value with respect to a current signal of a high- Counts the number of occurrences of the detected arc signal and the number of occurrences of no occurrence of the arc signal based on the comparison result of the output signal of the power supply current sensor for a predetermined period and counts the number of occurrences of the arc signal, A signal processing unit 20, a peak detecting unit 30, a control unit 30, and a control unit 30. The signal detecting unit 10, the signal processing unit 20, the peak detecting unit 30, the control unit 30, .

The signal detecting unit 10 is provided with a current sensor connected to the wired electric wire and detecting a signal included in a load current flowing through the electric wire, and the current sensor is coupled to a cable through which the use current is conducted, It is possible to detect a high frequency component of 1 MHz or more and 100 MHz or less. That is, the current sensor exhibits detection characteristics of a current signal in a wide band or a narrow band, and is arranged in a winding manner on an electric wire, such as an air core inductor and a high frequency ferrite core.

The signal processing unit 20 further includes an impedance matching module 21 for filtering a noise component included in the detected current signal and outputting a current signal of a predetermined frequency band, and an amplifier for amplifying a positive component of the current signal of the impedance matching module A peak detection module 23 for detecting a current signal having an instant power peak value among the amplified current signals of the first ALP amplification module 22 and an instantaneous power And a second RF amplification module 24 for amplifying the negative component of the current signal having the peak value.

Here, the impedance matching module 21 includes a filter circuit for extracting the immunity characteristics such as noise, EMI (Electro Magnetic Interference) noise, and signals of predetermined bands included in the current signal, and the filter circuit includes a coil A high pass filter provided by a coil L1 and a capacitor C1 and a band pass filter provided by a coil L2 and a capacitor C2 and a low pass filter including a coil L3 and a capacitor C3. That is, the filter circuit is provided to extract a current signal of a higher frequency band than the reference frequency band and a current signal of a lower frequency band below the critical frequency band. The output signal of the impedance matching module 21 is output in the form of an impulse.

On the other hand, since the output value of the current signal of the impedance matching module 21 is in the form of an impulse having a small value of several tens of mV, it is amplified into an impulse-shaped current signal having an average value larger than a predetermined value predetermined for conversion into a digital signal, shall.

Accordingly, the output signal of the impedance matching module 21 is supplied to the first RF amplifying module 22, and the first RF amplifying module 22 amplifies the positive component of the square-wave-shaped current signal. At this time, the amplification degree of the first RF amplification module 22 is determined based on the values of the resistors R1 and R2 and the reference resistance Rref, and the current component of the positive component of the impedance matching module 21 is amplified And the current signal obtained by amplifying the positive component is transmitted to the peak detection module 23.

The peak detection module 23 detects a current signal having an instantaneous power peak value from a square-wave-shaped current signal in which a positive component is amplified. The instantaneous power peak value is a peak value of the instantaneous rising power, and the instantaneous power peak value of the current signal is transmitted to the second RF amplification module 24.

The second RF amplifying module 24 amplifies the current signal of the negative component passed through the peak detecting module 23 to an amplification degree determined by the resistances of the resistors R4 and R5 and the resistance R6. Accordingly, the impulse-type current signal in which both the amplified positive component and the negative component are amplified is converted into an impulse-type waveform having an average value and output from the signal processing section 20.

The impulse-type current signal having the instantaneous power peak value is transmitted to the control unit 30. The control unit 30 converts the amplified current signal into a digital form and outputs an impulse-type current signal based on the digital instantaneous power peak value. It is determined whether or not an arc signal is generated based on the waveform. For example, the current signal amplified during a predetermined period is converted into a digital current signal, and whether or not an arc fault has occurred is determined based on a comparison between a current signal of an impulse type having an instantaneous power peak value of the converted digital form and a current signal waveform of a commercial power source do.

 3 shows a waveform of a current signal measured by the signal processing unit 20 by converting a current signal received from a current sensor having a high amplification characteristic in the range of 3 MHz to 5 MHz and shows an arc voltage, And the current signal of the signal processing unit 20. It can be seen that the output signal of the signal processing unit 20 is an impulse waveform due to the arc signal. This impulse-like waveform is a current signal having an instantaneous power peak value.

The control unit 30 compares the instantaneous power peak value received during a predetermined period of the predetermined period with the waveform of the impulse arc signal and the current signal of the power source to determine whether an arc fault signal is generated. Here, the controller 30 is a microprocessor having an 8-bit to 20-MHz frequency and an analog-to-digital converter (ADC) therein. The microprocessor 30 has an internal memory function and an arc signal for counting the number of impulse arc signals having instantaneous power peak values And a counter for counting the number of non-occurrence of arc signals, respectively.

That is, the current signal of the high-frequency component of the signal processing unit 20 received in a predetermined period (250 μs) is converted into a digital form and the instantaneous power peak value received for a predetermined number of times (32 times) Based on the number of times the arc signal of the impulse type is generated, it is judged whether an arc fault has occurred or not.

In the arc signal detection determination, the instantaneous power peak value included in the current signal of the digital form received for the predetermined number of times (32 periods) in a half cycle of a predetermined period It is determined whether or not an arc signal is generated based on the number of impulse-like waveforms.

That is, since the control unit 30 has an iterative characteristic that is important in the determination of the arc signal detection, the control unit 30 determines whether or not the impulse signal having the instantaneous power peak value included in the current signal of the digital form received for the predetermined number of times (32 periods) The number of waveforms of the waveform is counted as the number of occurrences of the arc signal.

4 is a waveform chart showing the arc signal measured by the control unit 30, the DC power source of the commercial power source, and the trip signal generation state. When the number of times the arc signal is generated reaches a predetermined reference value, And if it is an arc fault, it generates a trip signal and transfers it to a cable disconnecting device (not shown) so that the power of the cable is cut off.

In addition, it is possible to additionally determine whether or not an arc is generated based on the average current value of the low-frequency component of the digital signal in the form of a current. Based on the average current value of the low- A detailed description thereof will be omitted.

Thus, considering the repetitive generation of the arc signal, the result of comparison between the output signal of the commercial power source current sensor and the impulse-shaped arc signal having the instantaneous power peak value for the current signal of the high frequency component flowing in the electric wire, Based on the counted number of occurrences of the arc signal, and counts the number of occurrences of the arc signal when the number of occurrences of the arc signal reaches a predetermined reference value, determines whether an arc fault has occurred, and drives the cable disconnect device based on the determination result By generating the trip signal, it is possible to fundamentally prevent electrical damage due to the arc.

Based on the comparison result between the output signal of the commercial power supply current sensor and the impulse-shaped arc signal having the instant power peak value for the current signal of the high frequency component flowing to the cable in consideration of the repetitive generation of the arc signal Counts the number of occurrences of the detected arc signal for each predetermined period and counts the number of occurrences of the arc signal to a predetermined reference value to determine whether an arc fault has occurred, Will be described with reference to FIG.

FIG. 5 is a flowchart showing the operation of the serial arc detection apparatus shown in FIG. 1. Referring to FIG. 5, a series arc detection process according to another embodiment of the present invention will be described.

 First, the control unit 30 detects a current signal of a high frequency component at a predetermined cycle (250 μs), and extracts an impulse type waveform having an instantaneous power peak value included in the detected current signal of the high frequency component (S1, S2 ).

Then, the control unit counts the number of impulse-type current signals having the instantaneous power peak value received during the predetermined number of times (32 periods) in a half cycle of a predetermined cycle as the number of arc signal generation times and increases the number of times of no occurrence of arc signals respectively , S4).

If the count value of the arc signal occurrence count reaches the predetermined reference value, the control unit 30 determines that the arc fault occurs. If the arc fault has occurred, the control unit 30 generates a trip signal and transmits the trip signal to the cable disconnect device (not shown) -S7).

If it is determined in step S5 that the number of occurrences of the arc signal has not reached the determination reference value, it is determined whether the predetermined number of times of the half cycle period has elapsed. If not, the process proceeds to step S3.

According to an embodiment of the present invention, in consideration of repetitive generation of an arc signal, an impulse-shaped current signal having an instantaneous power peak value with respect to a current signal of a high frequency component flowing in a wire, Signal counting means for counting the number of occurrences of the arc signal on the basis of the comparison result of the signal for a predetermined period and counting the number of occurrences of the arc signal when the number of occurrences of the arc signal reaches a predetermined reference value, As the signal is generated, the reliability of the determination result of the arc failure can be maximized, and the electrical damage due to the arc can be fundamentally prevented.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

Based on the comparison result between the output signal of the commercial power supply current sensor and the impulse type current signal having the instantaneous power peak value for the current signal of the high frequency component flowing to the cable in consideration of the repeated occurrence of the arc signal Counts the number of occurrences of the arc signal of the detected arc signal for each predetermined period and counts the number of occurrences of the arc signal when the number of occurrences of the arc signal reaches a predetermined reference value to determine that an arc fault has occurred and generates a trip signal for driving the cable disconnecting device Accordingly, it is possible to maximize the reliability of the arc fault determination result, and to improve the accuracy and reliability of the operation of the serial arc detection apparatus and method that can fundamentally prevent electrical damage due to the arc, It can make great progress, and it is possible to Is an invention that is industrially applicable because it has a sufficient possibility of business and can be practically and practically carried out.

Claims (9)

A current detector for detecting a current signal of a high frequency component flowing through a wire by being connected to a cable wire;
A signal processor for filtering and amplifying a noise component included in the detected current signal to output a current signal of an impulse waveform having an instantaneous power peak value; And
And a controller for determining whether an arc fault has occurred based on a current signal of an impulse waveform having an instantaneous power peak value and an output signal of the power source current sensor,
The signal processing unit
An impedance matching module for filtering a noise component included in the detected current signal and outputting a current signal of a predetermined frequency band;
A first RF amplifying module for amplifying a positive component of a rectangular-wave-shaped current signal of the impedance matching module;
A peak detection module for outputting an impulse-shaped current signal having an instantaneous power peak value from the amplified current signal; And
And a second RF amplification module for amplifying a negative component of the current signal passed through the peak detection module,
Wherein,
Based on the comparison result between the output signal of the commercial power supply current sensor and the impulse-shaped arc signal having the instant power peak value for the current signal of the high frequency component flowing to the cable in consideration of the repetitive generation of the arc signal And counts the number of occurrences of the detected arc signal and the number of occurrences of no occurrence of the arc signal for a predetermined period, and determines whether an arc fault has occurred when the counted number of arc signals reaches a predetermined reference value. A series arc detection device.
delete delete delete delete delete (A) detecting a current signal of a high frequency component flowing in a wire by connecting the cable to a cable wire in a current detecting unit;
(B) filtering the noise component included in the current signal detected by the signal processing unit, positively amplifying the noise component, and detecting a current signal having an instantaneous power peak value from the amplified current signal; And
(C) judging whether an arc fault has occurred based on the arc frequency of the arc signal detected based on the comparison result between the current signal which is an impulse waveform having an instantaneous power peak value in the control section and the output signal of the commercial power source current sensor, ≪ / RTI >
The step (b)
A noise component included in the detected current signal is filtered to output a current signal of a predetermined frequency band, a positive component of a square wave type current signal of the impedance matching module is amplified, and an instantaneous power peak value is obtained from the amplified current signal A branch is provided for outputting a current signal in the form of an impulse and for amplifying a negative component of the current signal passed through the peak detection module,
The step (c)
Based on the comparison result between the output signal of the commercial power supply current sensor and the impulse-shaped arc signal having the instant power peak value for the current signal of the high frequency component flowing to the cable in consideration of the repetitive generation of the arc signal And counting the number of occurrences of the detected arc signal and the number of occurrences of no occurrence of the arc signal for a predetermined period, respectively, and determining whether an arc fault has occurred when the counted number of arc signal occurrences reaches a predetermined reference value. Serial arc detection method.
8. The method of claim 7, wherein step (c)
(C-1) counting the number of current signals of an impulse-type waveform having instantaneous power peak values received at predetermined pre-stored cycles for a predetermined number of cycles by a predetermined number of arc signal generation times; And
And (c-2) generating a trip signal by determining that an arc fault has occurred when the count value of the arc signal occurrence count reaches a predetermined determination reference value.
delete
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Cited By (2)

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KR20220061757A (en) * 2020-11-06 2022-05-13 조성철 Abnormal arc detecting device using frequency division and abnormal arc detecting method using the same
WO2024111702A1 (en) * 2022-11-21 2024-05-30 이성호 Arc detection system

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CN109239560B (en) * 2018-11-29 2021-04-13 浙江习羽智能科技有限公司 Fault arc detection method, device and storage medium
KR102483455B1 (en) * 2020-12-28 2022-12-30 주식회사 이엘티 Arc Detection Device With An Arc Detection Algorithm Resistant To Noise
KR102507187B1 (en) * 2022-06-28 2023-03-09 탑인더스트리(주) Switchgear having abnormal operating detection function using artificial intelligence and operation control method thereof

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KR101454203B1 (en) * 2014-07-16 2014-11-04 주식회사 태강전기 Low current arc detecting system

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KR101454203B1 (en) * 2014-07-16 2014-11-04 주식회사 태강전기 Low current arc detecting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220061757A (en) * 2020-11-06 2022-05-13 조성철 Abnormal arc detecting device using frequency division and abnormal arc detecting method using the same
KR102453122B1 (en) 2020-11-06 2022-10-07 조성철 Abnormal arc detecting device using frequency division and abnormal arc detecting method using the same
WO2024111702A1 (en) * 2022-11-21 2024-05-30 이성호 Arc detection system

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