KR20110012116A - Arc detecting device, arc blocking apparatus, arc detecting method and arc blocking method - Google Patents

Arc detecting device, arc blocking apparatus, arc detecting method and arc blocking method Download PDF

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Publication number
KR20110012116A
KR20110012116A KR1020090069680A KR20090069680A KR20110012116A KR 20110012116 A KR20110012116 A KR 20110012116A KR 1020090069680 A KR1020090069680 A KR 1020090069680A KR 20090069680 A KR20090069680 A KR 20090069680A KR 20110012116 A KR20110012116 A KR 20110012116A
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KR
South Korea
Prior art keywords
arc
line
voltage
waveform
detector
Prior art date
Application number
KR1020090069680A
Other languages
Korean (ko)
Inventor
양승국
Original Assignee
단암엔지니어링 주식회사
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Application filed by 단암엔지니어링 주식회사 filed Critical 단암엔지니어링 주식회사
Priority to KR1020090069680A priority Critical patent/KR20110012116A/en
Publication of KR20110012116A publication Critical patent/KR20110012116A/en

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    • 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
    • G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
    • 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
    • G01R19/32—Compensating for temperature change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • 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

Abstract

PURPOSE: The arc detector, the arc blocking device, the arc detecting method and the arc blocking method can save the manufacturing cost. CONSTITUTION: An amplifier(520) amplifies a voltage applied to a line resistance(510) of the neutral conductor line. A detecting unit(530) detects a level of the amplified voltage or a waveform. A determining unit(540) determines whether the arc is generated or not on the basis of the detected voltage level or the waveform.

Description

Arc Detector, Arc Blocking Device, Arc Detection Method and Arc Blocking Method {Arc Detecting Device, Arc Blocking Apparatus, Arc Detecting Method and Arc Blocking Method}

The present invention relates to an apparatus and a method for detecting and blocking an arc, and more particularly, to an arc detector, an arc blocking device, an arc detection method, and an arc blocking method for detecting and blocking an arc using a line resistance of a neutral line. will be.

In modern industrialized society, electricity makes people's lives easier and more enjoyable. As the use of such electricity increases, fires caused by electricity frequently occur, increasing property loss and human damage. In order to prevent such damage, the installation of earth leakage breaker is mandatory, but the fire caused by electricity is not reduced.

Investigating the causes of electrical fires in order to reduce the frequency of fires caused by electricity, the researchers found that electrical fires generate arcs as the primary symptom before a fire occurs. In addition, it has been found that electric fire may be generated by the arc generated in this way. Therefore, in order to reduce the occurrence of fire due to electricity, it is more important to detect whether an arc has occurred and to block it if an arc occurs.

An arc detection method includes a current detection method that senses a current flowing in a primary side by using a current transformer (CT).

SUMMARY OF THE INVENTION An object of the present invention is to provide an arc detector, an arc blocking device, an arc detection method, and an arc blocking method for detecting a voltage applied to a line resistance of a neutral line and determining whether an arc is generated through the arc.

In order to achieve the above object, an arc detector according to an aspect of the present invention includes a line resistor of the neutral wire (Neutral Wire); An amplifier for amplifying the voltage applied to the line resistance; A detector detecting a level or waveform of the amplified voltage; And a determination unit determining whether an arc is generated based on the detected level or waveform of the voltage.

According to another aspect of the present invention, an arc blocking device includes an arc detector according to any one of claims 1 to 4; And a blocking unit for blocking the generated arc signal when it is determined that the arc has occurred by the arc detector.

According to another aspect of the present invention, an arc detection method includes amplifying a voltage applied to a line resistor of a neutral wire; Detecting a level or waveform of the amplified voltage; And determining whether an arc is generated based on the detected level or waveform.

Arc blocking method according to another aspect of the present invention comprises the steps of receiving a determination result of whether the arc generation through the arc detection method of any one of claims 6 to 8; And if the arc is generated as a result of the determination, blocking output of the generated arc signal.

According to the present invention, the arc can be detected by using the resistance of the cheap neutral line instead of the current transformer, thereby reducing the production cost.

In addition, since the arc can be stably detected through the line resistance of the neutral line, there is an advantage of accurately blocking the arc.

By blocking the generated arc there is an effect that can prevent the fire in advance.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the invention is defined only by the description of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, “comprises” or “comprising” means the presence of one or more other components, steps, operations and / or elements other than the components, steps, operations and / or elements mentioned or Does not preclude addition.

The present invention relates to an arc detector and an arc detection method for detecting an arc using the line resistance of any one line in a three-phase three-wire or three-phase four-wire or two-phase. For convenience of description, one line will be described as an example of a neutral wire, but the present invention is not limited thereto.

Hereinafter, an arc detector according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a block diagram illustrating an arc detector according to an exemplary embodiment of the present invention, and FIG. 2 is an exemplary diagram for describing an amplifier of FIG. 1.

As shown in FIG. 1, the arc detector 500 according to an embodiment of the present invention may include a line resistance 510, an amplifier 520, a detector 530, and a determiner 540 of a neutral line. Can be.

The wire resistance of the neutral wire (Neutral Wire) 510 may be a line resistance of the neutral wire (Neutral Wire) mechanically constructed by using a member of a separate metal material for mechanical coupling with internal wires such as breakers, It may be a line resistance provided on a line to which power is supplied from the power supply unit 200 to the load 400. The line resistor 510 connected in series between the power supply 200 and the load 400 has a voltage applied to both ends when the switch 100 is turned on and AC power is applied to the load 400 from the power supply 200. Can be.

When AC power is applied, the AC / DC converter 300 may convert the applied AC power into DC power and apply the converted DC power to the arc detector 500. The amplifier 520, the detector 530, and the determiner 540 included in the arc detector 500 may operate by DC power applied from the AC / DC converter 300.

The amplifier 520 may receive the DC power from the AC / DC converter 300 to amplify the voltage applied to the line resistor 510 of the neutral line. That is, the amplifier 520 may amplify the voltage across the line resistor 510 according to a predetermined amplification degree.

The amplifier 520 uses a positive temperature coefficient (PTC) resistor 521 or a negative temperature coefficient (NTC) resistor 522 to convert the voltage across the line resistance 510 as shown in FIG. 2. The ambient temperature of the 510 may be compensated for, and the temperature compensated voltage may be amplified and output. For example, as illustrated in FIG. 2A, the amplifier 520 compensates the ambient temperature of the line resistor 510 using the PCT resistor 521 and then applies a voltage across the line resistor 510. As shown in (b) of FIG. 2, the voltage across the line resistor 510 is first amplified and then the ambient temperature of the line resistor 510 is adjusted using the NTC resistor 522. You can also compensate.

In addition, the amplifier 520 may multiply and output the voltage across the line resistor 510. For example, the amplifier 520 may be configured by adding an amplifier to the input terminal of the circuit shown in (a) or (b) of FIG. 2, and the amplifier 520 configured as described above is disposed across the line resistor 510. After amplifying the voltage through the added amplifier, the voltage amplified through the circuit shown in (a) or (b) of FIG. 2 may be temperature-compensated and output. Alternatively, the amplifier 520 may be configured by adding an amplifier to an output terminal of the circuit shown in FIG. 2A or 2B, and the amplifier 520 configured as described above may have a voltage across the line resistor 510. The temperature may be first amplified through the circuit shown in (a) or (b) of FIG. 2 and then amplified by the added amplifier.

The detector 530 may include a level detector 531 and a waveform detector 532.

The level detector 531 may detect the level of the voltage amplified by the amplifier 520.

The waveform detector 532 may detect a waveform of the voltage amplified by the amplifier 520.

The voltage detection range of the detection unit 530 may be preset so that the detection unit 530 does not detect the voltage for all voltages across the line resistance 510, and the voltage is detected only at the set level or waveform range. When the voltage detection range is preset, the detector 530 may detect the voltage level or waveform only within the set range. That is, the voltage level or waveform range that can be determined as arc generation can be measured in advance through a test, and the detection range of the voltage level or waveform that can be detected by the detector 130 can be determined based on the measured value. Can be set. The voltage level or waveform can be detected only within the set range, so that the detector 130 can detect the arc signal accurately and quickly.

The determination unit 540 may include an arc defining unit 541 and an arc checking unit 542, and may determine whether an arc is generated based on a voltage level or waveform detected by the detection unit 530.

The arc defining unit 541 may compare the detected voltage with at least one of a level and a waveform of a predetermined voltage.

The arc check unit 542 may determine whether an arc has occurred based on a comparison result of the arc defining unit 541.

For example, the determination unit 540 may compare the detected voltage with at least one of a level and a waveform of a predetermined voltage. As a result of the comparison, when the detected value exceeds at least one of the preset values, the determination unit 540 may determine that an arc has occurred.

In this way, it is possible to reduce the production cost by detecting the arc by using the low-cost neutral line line resistance instead of the current transformer, detect the voltage applied to the line resistance, and determine whether the arc is generated based on the level or waveform of the detected voltage. It can judge, and an arc can be detected stably.

The arc detector according to an embodiment of the present invention has been described above. Hereinafter, an arc blocking device according to another embodiment of the present invention will be described with reference to FIG. 3. 3 is a block diagram illustrating an arc blocking device according to another embodiment of the present invention.

As shown in FIG. 3, the arc blocking device 200 according to another embodiment of the present invention includes an arc detector 100 and a blocking unit 210.

As described with reference to FIG. 1, the arc detector 100 may detect a voltage applied to the line resistance 510 of the neutral line and determine whether an arc is generated based on the detected voltage level or waveform. . For example, the arc detector 100 may compare the detected voltage with at least one of a level and a waveform of a predetermined voltage. As a result of the comparison, when the detected value exceeds at least one of the preset values, the arc detector 100 may determine that an arc has occurred.

If it is determined that the arc has occurred in the arc detector 100, the blocking unit 210 may block the generated arc signal.

As such, by blocking the generated arc, it is possible to prevent a fire that may occur due to electricity in advance, thereby reducing property loss and human damage.

The arc blocking device according to another embodiment of the present invention has been described above. Hereinafter, an arc detection method according to an embodiment of the present invention will be described with reference to FIG. 4. 4 is a flowchart illustrating an arc detection method according to an embodiment of the present invention.

As shown in FIG. 4, the voltage applied to the line resistance 510 of the neutral line may be amplified (S310). The voltage applied to the line resistor 510 may be amplified to easily detect the level or waveform of the voltage applied to the line resistor 510.

The level or waveform of the amplified voltage may be detected (S320). The arc voltage may be detected by multiplying the arc current flowing through the neutral line and the line resistance 510. The voltage detection range may be set to detect a voltage level or waveform only within the set range. That is, the level or waveform of voltage that can be determined as arc generation can be measured through a test, and the detection range of the level or waveform of voltage that can be detected through this measurement can be preset. By detecting the voltage level or waveform only within the set range, it is possible to accurately and quickly detect the arc signal.

The detected voltage may be compared with at least one of a level and a waveform of a predetermined voltage (S330).

As a result of the comparison, when the detected value exceeds at least one of the preset values, it may be determined that an arc has occurred (S340).

However, as a result of the determination, when the detected value does not exceed the preset value, the process returns to step S310 to repeat the above-described steps (S310 to S330).

The arc detection method according to an embodiment of the present invention has been described above. Hereinafter, an arc blocking method according to another embodiment of the present invention will be described with reference to FIG. 5. 5 is a flowchart illustrating an arc blocking method according to another embodiment of the present invention.

As shown in FIG. 5, an arc may be detected (S410). For example, the voltage applied to the line resistance 510 of the neutral line may be detected, and it may be determined whether an arc is generated based on the detected voltage level or waveform (S420). That is, the detected voltage may be compared with at least one of a level and a waveform of a predetermined voltage. When the detected value exceeds at least one of the predetermined values, it may be determined that an arc has occurred.

As a result of the determination, if an arc has occurred, the arc signal may be blocked (S430). However, if it is determined that the arc has not occurred, the process returns to step S410 and the above-described steps S410 to S420 may be repeatedly performed.

Although the configuration of the present invention has been described in detail with reference to the preferred embodiments and the accompanying drawings, this is only an example, and various modifications are possible within the scope without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a block diagram illustrating an arc detector according to an embodiment of the present invention.

2 is an exemplary view illustrating an amplifier of FIG. 1.

Figure 3 is a block diagram illustrating an arc blocking device according to another embodiment of the present invention.

4 is a flowchart illustrating an arc detection method according to an embodiment of the present invention.

5 is a flow chart illustrating an arc blocking method according to another embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS

100: switch 200: power supply

300: AC / DC converter 400: load

500: arc detector 510: line resistance

520: amplifier 521: PTC resistance

522: NTC resistance 530: detector

540: determination unit 200: arc blocking device

210: breaker

Claims (11)

Line resistors of Neutral Wire; An amplifier for amplifying the voltage applied to the line resistance; A detector detecting a level or waveform of the amplified voltage; And Determination unit for determining whether the arc is generated based on the detected level or waveform of the voltage Arc detector comprising a. The method of claim 1, Arc resistance of the neutral line is made of a wire or a metal member of the arc detector. The method of claim 1, wherein the amplification unit Compensating the ambient temperature of the line resistance with a positive temperature coefficient (PTC) resistance or a negative temperature coefficient (NTC) resistance to amplify the voltage applied to the line resistance. The method of claim 1, The line resistance of the neutral line is proportional to the length of the line and inversely proportional to the cross-sectional area, The detection unit The arc detector for detecting the arc voltage by the product of the arc current flowing in the neutral line and the line resistance value of the neutral line. The method of claim 1, The determining unit compares the detected voltage with at least one of a level and a waveform of a predetermined voltage, and determines that the arc has occurred when the detected value exceeds at least one of the predetermined values as a result of the comparison. Detector. The arc detector of any one of claims 1 to 5; And When it is determined that the arc is generated by the arc detector, the blocking unit for blocking the generated arc signal Arc blocking device comprising a. Amplifying a voltage applied to a line resistor of a neutral wire; Detecting a level or waveform of the amplified voltage; And Determining whether an arc is generated based on the detected level or waveform Arc detection method comprising a. The method of claim 7, wherein The line resistance of the neutral line is proportional to the length of the line and inversely proportional to the cross-sectional area, The detecting step Detecting the arc voltage by multiplying the arc current flowing through the neutral line and the resistance value of the line of the neutral line. The method of claim 7, wherein the determining step, Comparing the detected voltage with at least one of a level and a waveform of a predetermined voltage; And Determining that the arc has occurred when a value detected as a result of the comparison exceeds at least one of preset values. Arc detection method comprising a. Receiving a determination result of whether the arc occurs through the arc detection method of any one of claims 7 to 9; And If the arc is generated as a result of the determination, blocking output of the generated arc signal Arc blocking method comprising a. Line resistance of one line in three-phase three-wire or three-phase four-wire; An amplifier for amplifying the voltage applied to the line resistance; A detector detecting a level or waveform of the amplified voltage; And Determination unit for determining whether the arc is generated based on the detected level or waveform of the voltage Arc detector comprising a.
KR1020090069680A 2009-07-29 2009-07-29 Arc detecting device, arc blocking apparatus, arc detecting method and arc blocking method KR20110012116A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102015619B1 (en) 2018-09-14 2019-10-21 주식회사 텔다 Leakage current detecting device having arc preventing circuit
WO2021115675A1 (en) * 2019-12-12 2021-06-17 Robert Bosch Gmbh Device for measuring a current through a choke and method for operating a device for measuring a current through a choke
KR102457493B1 (en) * 2022-07-27 2022-10-21 윤성전력(주) IoT system for monitoring strain insulator of power line
KR20230068486A (en) * 2021-11-10 2023-05-18 전남대학교산학협력단 Method and apparatus for modeling arc, method and apparatus for detecting open faults with arc in power distribution networks

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102015619B1 (en) 2018-09-14 2019-10-21 주식회사 텔다 Leakage current detecting device having arc preventing circuit
WO2021115675A1 (en) * 2019-12-12 2021-06-17 Robert Bosch Gmbh Device for measuring a current through a choke and method for operating a device for measuring a current through a choke
KR20230068486A (en) * 2021-11-10 2023-05-18 전남대학교산학협력단 Method and apparatus for modeling arc, method and apparatus for detecting open faults with arc in power distribution networks
KR102457493B1 (en) * 2022-07-27 2022-10-21 윤성전력(주) IoT system for monitoring strain insulator of power line

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