KR20080104678A - Current detector of a power line for a low pressure mourning circuit breaker - Google Patents

Current detector of a power line for a low pressure mourning circuit breaker Download PDF

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Publication number
KR20080104678A
KR20080104678A KR1020070051770A KR20070051770A KR20080104678A KR 20080104678 A KR20080104678 A KR 20080104678A KR 1020070051770 A KR1020070051770 A KR 1020070051770A KR 20070051770 A KR20070051770 A KR 20070051770A KR 20080104678 A KR20080104678 A KR 20080104678A
Authority
KR
South Korea
Prior art keywords
power line
circuit breaker
current
magnetic force
low voltage
Prior art date
Application number
KR1020070051770A
Other languages
Korean (ko)
Inventor
임채현
Original Assignee
대진전기 (주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대진전기 (주) filed Critical 대진전기 (주)
Priority to KR1020070051770A priority Critical patent/KR20080104678A/en
Publication of KR20080104678A publication Critical patent/KR20080104678A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/07—Non contact-making probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
    • 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
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/15—Indicating the presence of current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux

Abstract

The current detecting apparatus of the power line for the low voltage circuit breaker is provided to implement the current sense and the current detecting apparatus of the light weight and miniature. The current detecting apparatus of the power line for the low voltage circuit breaker is provided. It is adhered to one side of the busbar for the power line of the low voltage circuit breaker. The current of the power line is detected. The magnetic force detector and sensor(120) in which the air core coil is installed of the magnetism open type. The first condenser filters the high frequency noise flowed in the signal found from magnetic force detector and sensor. The operational amplifier(130) amplifies The detection signal outputted in the first condenser (C1) and outputs the current detecting signal corresponding to the amplification. The second condenser(C2) filters The high frequency noise which is connected to the output terminal of the operational amplifier and removes.

Description

Current detector of power line for low pressure air circuit breaker {Current detector of a power line for a low pressure mourning circuit breaker}

1 is a cross-sectional view of a low pressure air circuit breaker to which the present invention is applied.

2 is a plan view of the magnetic force detection sensor attached to the busbar of the current detection device of the power line for low-voltage air circuit breaker according to the present invention.

3 is a cross-sectional view of a magnetic force detection sensor attached to the busbar.

4 is a circuit diagram of a current detection device of a power line for a low-voltage air circuit breaker according to the present invention.

<Description of the code | symbol about the principal part of drawing>

110. Busbar

120... Magnetic force detection sensor

130... Operational Amplifier

C1, C2... First and second capacitors

The present invention relates to a current detection device of a power line for a low voltage air circuit breaker (ACB), and more particularly, to close the self-opening magnetic force detection sensor provided with an air core coil at a certain distance to the power line busbar to detect current. Patent No. applied for the current detection device of a power line for a low voltage circuit breaker to implement a small and light current detection device compared to a current detection current transformer (CT) and to reduce noise mixed in from the outside. In Patent No. 10-0570915, in order to detect a current flowing in a power line, a ferrite core is removed to provide a current detection sensor (image transformer) by removing the ferrite core so that a larger current does not have a saturated dome of the iron core. There is a purpose.

Current detection of power lines commonly used in conventional low voltage air circuit breakers (ACBs) uses a self-closing large-scale image current transformer (CT) to detect the current of power lines.

However, such a current detection device of a power line has caused the following problems by using a large image current transformer.

In other words, due to the large volume, the area of contact with the power line is very large, and due to the large capacitance, various noises mixed in the power line are introduced, which adversely affects the current control circuit. Due to the influence of the magnetic force caused by the current transformer, a small amount of power was lost.

In order to solve the problems that occur in the current detection device of the conventional low-voltage air circuit breaker power line of the present invention,

An object of the present invention is to implement a compact and lightweight current detection device compared to conventional current transformer CT by detecting a current by approaching a self-opening magnetic force detection sensor with an air core coil at a predetermined distance to a busbar for power lines. The present invention provides a device for detecting a current of a power line for a low voltage air circuit breaker.

Another object of the present invention is to provide a current detection device for a power line for a low-voltage air circuit breaker to reduce the noise mixed from the outside to prevent power loss.

The "current detection device of the power line for low-voltage air circuit breaker" of the present invention for achieving the above object is a magnetically open type magnetic force detection sensor is installed on one side of the power line busbar and installed in the air core coil for detecting the current of the power line; An op amp that amplifies the detection signal output from the first capacitor according to a preset amplification degree and outputs the current detection signal, and secondary filtering to remove high frequency noise included in the output signal connected to an output terminal of the op amp; It is characterized by consisting of a second capacitor. Hereinafter, a preferred embodiment of the present invention according to the technical spirit as described above will be described in detail with reference to the accompanying drawings.

First, the present invention is to detect the magnetic force generated in the power line, by using a small magnetic self-opening magnetic force detection sensor of the self-opening type does not restrain the magnetic line generated in the power line, the air core coil is not easily saturated, high current accurately Will be detected. In addition, by providing a certain distance from the power line, it is possible to significantly reduce the high-frequency noise mixed in the power line. In addition, since the size is very small, the capacitance with the power line can be kept small.

1 is a cross-sectional view of a low pressure air circuit breaker to which the present invention is applied. Here, reference numeral 101 denotes an arc extinguishing chamber, reference numeral 102 denotes a main circuit conductor, reference numeral 103 denotes a remote control voltage release switch, 104 denotes a charging handle, and reference numeral 105 denotes a tripping mechanism, reference numeral 106 denotes a contact spring, reference numeral 107 denotes a link mechanism, and reference numeral 108 denotes a stored-energy mechanism. Reference numeral 109 denotes a closing spring. Since the structure of the low pressure air circuit breaker is a structure of a general low pressure air circuit breaker, its detailed description is omitted. The present invention attaches a small self-opening magnetic force detection sensor 120 of a self-opening type to a predetermined position of the power line busbar 110 of the low-voltage air circuit breaker as described above to detect the current of the power line.

2 is a plan view of the magnetic force detection sensor 120 of the power line for low-voltage air circuit breaker according to the present invention attached to the busbar, Figure 3 is a cross-sectional view of the magnetic force detection sensor 120 attached to the busbar.

The magnetic force detection sensor 120 is a self-opening magnetic force detection sensor in the form of an air core coil wound, and is very compact and lightweight. In addition, since the magnetic force detection sensor 120 is attached to the power line busbar 110, the magnetic force detection sensor 120 is separated from the power line by a certain distance, thereby greatly reducing the inflow of high-frequency noise generated from the power line, thereby preventing malfunction of the current control circuit. You can do it.

4 is a circuit diagram of a current detection device of a power line for a low-voltage air circuit breaker according to the present invention. As shown therein, the high frequency noise included in the detection current output from the magnetically open type magnetic force detection sensor 120 attached to one side of the power line busbar 110 and installed with an air core coil detecting the current of the power line. The first capacitor (C1) for filtering the first is provided, and the operational amplifier 130 for amplifying the detection current output from the first capacitor (C1) according to a predetermined amplification degree and outputs the current detection signal is provided, A second capacitor C2 for secondary filtering high frequency noise included in the signal of the operational amplifier 130 is connected to an output terminal of the operational amplifier 130. Looking at the operation of the current detection device of the power line for low voltage circuit breaker configured as described above are as follows.

First, the magnetic force detection sensor 120 is attached to one side of the power line bus bar 110, as is well known, the first capacitor (C1) is included in the detection signal output from the magnetically open magnetic force detection sensor 120 The first high frequency noise is filtered and removed. The detection signal from which the high frequency noise has been removed is applied to the non-inverting terminal (+ terminal) of the operational amplifier 130, and the operational amplifier 130 is applied to the signal that is applied to the inverting terminal (-terminal) and the non-inverting terminal (+ terminal). ) By subtracting a reference signal applied to the amplification signal and amplifying the difference signal corresponding to a preset amplification degree. The second capacitor C2 connected to the output terminal of the operational amplifier 130 filters the high frequency noise remaining in the detection signal output from the operational amplifier 130 to filter the detected signal (output) from which the noise is completely removed. It will be provided later.

According to the present invention described above, by detecting the current of the power line using a self-opening magnetic force detection sensor of the air core coil wound, there is an effect that can reduce the weight and volume of the current detection sensor. In addition, by attaching the magnetic force detection sensor to the power line busbar, the magnetic force detection sensor exists at a certain distance away from the power line, thereby preventing the inflow of noise generated from the power line and reducing the malfunction of the current control circuit. have.

In addition, the use of a compact, lightweight, self-opening magnetic force detection sensor can reduce the manufacturing cost of the current sensing device, and also has the advantage that the reliability of the current control circuit can be expanded by precise current detection.

Claims (2)

In the current detection device of the power line for low voltage air circuit breaker, the magnetic force detection sensor 120 of the self-opening type attached to one side of the power line bus bar 110 of the low voltage air circuit breaker is installed with an air core coil for detecting the current of the power line And a first capacitor C1 for first filtering the high frequency noise introduced into the signal detected by the magnetic force detection sensor 120 and a detection signal output from the first capacitor C1 to correspond to a preset amplification degree. An operational amplifier 130 that amplifies and outputs the current detection signal; and a second capacitor C2 connected to an output terminal of the operational amplifier 130 to secondary-filter and remove high frequency noise included in the output current detection signal. Current detection device of the power line for low voltage circuit breaker, characterized in that consisting of. The apparatus of claim 1, wherein the magnetic force detection sensor (120) is installed at a distance away from the power line.
KR1020070051770A 2007-05-29 2007-05-29 Current detector of a power line for a low pressure mourning circuit breaker KR20080104678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070051770A KR20080104678A (en) 2007-05-29 2007-05-29 Current detector of a power line for a low pressure mourning circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070051770A KR20080104678A (en) 2007-05-29 2007-05-29 Current detector of a power line for a low pressure mourning circuit breaker

Publications (1)

Publication Number Publication Date
KR20080104678A true KR20080104678A (en) 2008-12-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070051770A KR20080104678A (en) 2007-05-29 2007-05-29 Current detector of a power line for a low pressure mourning circuit breaker

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KR (1) KR20080104678A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101067866B1 (en) * 2009-09-30 2011-09-27 한국전력공사 Cable failure point detection system and method
CN102297121A (en) * 2011-05-11 2011-12-28 中达电子零组件(吴江)有限公司 Detecting device and method of low-voltage start of fan

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101067866B1 (en) * 2009-09-30 2011-09-27 한국전력공사 Cable failure point detection system and method
CN102297121A (en) * 2011-05-11 2011-12-28 中达电子零组件(吴江)有限公司 Detecting device and method of low-voltage start of fan

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