KR101550824B1 - Device for Detecting the Micro-Leakage Current and Method for Detecting Micro-Leakage Current at Already Installed on Track - Google Patents

Device for Detecting the Micro-Leakage Current and Method for Detecting Micro-Leakage Current at Already Installed on Track Download PDF

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Publication number
KR101550824B1
KR101550824B1 KR1020150040881A KR20150040881A KR101550824B1 KR 101550824 B1 KR101550824 B1 KR 101550824B1 KR 1020150040881 A KR1020150040881 A KR 1020150040881A KR 20150040881 A KR20150040881 A KR 20150040881A KR 101550824 B1 KR101550824 B1 KR 101550824B1
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KR
South Korea
Prior art keywords
leakage current
leakage
breaker
amount
detecting
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KR1020150040881A
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Korean (ko)
Inventor
신양식
이용희
박창우
박영호
우제상
한미수
김재현
Original Assignee
케이앤제이계전(주)
에스케이텔레콤 주식회사
주식회사 티큐브테크
한미수
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Priority to KR1020150040881A priority Critical patent/KR101550824B1/en
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Publication of KR101550824B1 publication Critical patent/KR101550824B1/en

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    • G01R31/025—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • 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
    • G01R19/10—Measuring sum, difference or ratio
    • 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

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

Abstract

A micro leakage which is provided in a general earth leakage breaker or a return type earth leakage breaker to detect a micro leakage current already flowing in a preliminarily installed line by using at least one of a zero-current detection rectifier (ZCT) for detecting a leakage current of an earth leakage breaker A current sensing device is disclosed.
An apparatus for detecting micro leakage current includes an electrical leak detecting unit for detecting a leakage current of a line using at least one of a zero current transformer (ZCT) and a leakage current detection IC; A conversion unit for converting leakage current data sensed by the electrical leak detecting unit; A control unit for controlling the display information for comparing the converted leakage current amount with a predetermined value and informing the leakage current amount according to the comparison result, and connected to the installed line; And a display unit for displaying the amount of leakage current according to a control signal received from the control unit. .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a micro-leakage current sensing device and a micro-leakage current sensing device,

More particularly, the present invention relates to a device for detecting a micro-leakage current already flowing in a pre-installed line connected to an earth leakage breaker and a method for detecting a micro-leakage current will be.

An earth leakage breaker is a device used to prevent the risk of electric shock due to a short circuit in a transformer connected to electric machinery and various electric devices. The earth leakage circuit breaker is mandatory in order to prevent the danger of electric shock and fire due to electric accident by automatically cutting the current when a leakage current (leakage current) is detected.

The current leakage circuit breaker is basically a trip circuit breaker tripped (tripped, off state) when the leakage current is 15mA or more and 30mA or less. Typical earth leakage circuit breakers and return type earth leakage circuit breakers can not detect the amount of leakage current already flowing in the installed line. More specifically, the conventional earth leakage breaker can not know the amount of leak current generated when a leak current already flowing in a pre-installed line is generated when the earth leakage breaker is turned on or off. For this reason, there are many difficulties in preliminary inspection of electronic devices and lines connected to the earth leakage breaker. If the leakage current is not known when the earth leakage breaker is off (TRIP), it may cause an accident when the earth leakage breaker is manually turned on.

In general electric machinery and various electric devices, there is a fine leakage current which is already flowing before the operation of a specific electric device. That is, even before the earth leakage breaker is installed, a minute leakage current flows in the installed machine. This leakage current affects the operation of the earth leakage breaker after installing the earth leakage breaker. For example, the leakage circuit breaker frequently shuts down due to the influence of the leakage current, which may cause problems in power supply. The automatic return type earth leakage breaker automatically returns the earth leakage breaker to unnecessary shutdown, but when a general earth leakage breaker trips unnecessarily (TRIP) (shut down), it is inconvenient ≪ / RTI >

In addition, when communication equipment or the like stops operation due to an unnecessary shutdown of an earth leakage breaker, etc., it can not provide a high quality service to people using communication devices such as communication quality deterioration. In addition, there is a need to move personnel directly to the service area in order to operate the communication equipment again.

In addition, if the leakage circuit breaker is shut down unnecessarily due to the micro leakage current that is already flowing, the electric power supplied to the electric circuit connected to the earth leakage breaker is not supplied, and devices that help prevent various crimes such as CCTV are not operated, .

The present invention provides a micro current sensing device and a micro leakage current sensing method for detecting a micro leakage current amount already generated in a pre-installed line and displaying the detected micro leakage current amount on an earth leakage breaker.

That is, through the present invention, the micro leakage current amount already flowing in the power supply at the front end of the earth leakage breaker is detected and displayed to provide information on the amount of micro leakage current already flowing to the user. Thus, You can get help when you do.

According to an aspect of the present invention, there is provided an apparatus for detecting a micro leakage current, the apparatus comprising: a leakage current detecting unit for detecting leakage current; It detects the micro leakage current already flowing in the line. The micro leakage current sensing apparatus includes an electrical leak detecting unit for sensing a leakage current of the line using at least one of a zero-current transformer (ZCT) and a leakage current detection IC; A conversion unit for converting leakage current data sensed by the electrical leak detecting unit; A control unit for controlling the display information for comparing the converted leakage current amount with a predetermined value and informing the leakage current amount according to the comparison result, and connected to the installed line; And a display unit for displaying the amount of leakage current according to a control signal received from the control unit. .

In a preferred embodiment, the control unit is connected to the pre-installed line, receives the power from the pre-installed line even when the earth leakage breaker is off, detects the fine leakage current already flowing in the continuously installed line, And compares the amount of current with a predetermined value.

In a preferred embodiment, the display unit converts the amount of leakage current into a numerical value and a level according to a control signal received from the control unit, and displays it on the display unit using a light-emitting diode (LED), a flexible numeric display (FND) do.

In a preferred embodiment, the control unit records the off-time of the earth leakage breaker when the off-circuit occurs in the earth leakage breaker, and when the amount of leakage current is equal to or greater than the predetermined value, it is determined that the situation is abnormal.

In a preferred embodiment, the display unit displays the leakage current amount information, and displays the off-generation time point or the abnormal-point occurrence time point information of the earth leakage breaker in accordance with the selection.

In accordance with another aspect of the present invention, there is provided a method of detecting a micro-leakage current that detects a micro-leakage current already flowing in a pre-installed line by using a ZCT for leakage current detection and an IC for detecting leakage current in a normal earth leakage breaker or a return- Detecting a leakage current amount of a pre-installed line using at least one of a phase transformer (ZCT) and a leakage current detection IC; Converting the detected amount of leakage current; Comparing the converted leakage current amount with a predetermined value, and controlling display information indicating a leakage current amount according to a comparison result; Displaying a leakage current amount already flowing in a pre-installed line according to a display control signal indicating an amount of leakage current; .

In a preferred embodiment, the step of sensing the leakage current amount of the pre-installed line

When the earth leakage breaker trips, it receives power from the installed line and detects the leakage current of the installed line.

In a preferred embodiment, the step of displaying the amount of leakage current comprises the steps of converting a leakage current amount into a number and a level according to a display control signal indicating the amount of leakage current, and converting the amount of leakage current into a light-emitting diode (LED), a flexible numeric display (FND) Display).

In a preferred embodiment, the step of detecting the leakage current amount of the pre-installed line records the trip occurrence time of the earth leakage breaker when a trip occurs in the earth leakage breaker, and when the leakage current amount is equal to or greater than a predetermined value, Record when the situation occurred.

In a preferred embodiment, the step of displaying the leakage current amount displays the leakage current amount information, and displays the off-time of the earth leakage breaker or the time of occurrence of the abnormal situation according to the selection.

 According to the present invention, firstly, by detecting the microcurrent already flowing in the pre-installed line (the power supply of the front end of the earth leakage breaker), the state of the equipment connected to the power supply at the front end can be grasped and a malfunction and a safety accident can be prevented in advance.

Second, the earth leakage breaker according to the embodiment of the present invention performs functions of a general earth leakage breaker and an automatic return type earth leakage breaker, and visually displays the amount of leakage current when a leakage current is generated in a breaker on state and an off state do. As a result, the leakage current amount can be known when the earth leakage breaker is manually turned on (power is turned on again). By using this, it is possible to judge whether or not the circuit breaker is manually turned on, and it is possible to prevent human and material accidents by previously adjusting the leakage current of the power line.

Third, the power supply can be smoothly performed by preventing the unnecessary circuit breaker from shutting down due to the micro leakage current already flowing from the front power source.

Fourth, even if the earth leakage breaker is shut off, the present invention utilizes the power of the front power source, so that even if the earth leakage breaker is shut off, the amount of micro leakage current can be continuously detected using the power source at the front without stopping the operation.

Fifth, by detecting the micro leakage current already flowing in the front line, it is possible to protect expensive communication equipments by detecting the cause of leakage current.

1 is a diagram illustrating a configuration of an apparatus for sensing a micro leakage current according to an embodiment of the present invention.
2 is a flowchart illustrating a method of sensing a micro leakage current according to an embodiment of the present invention.
3 is a circuit diagram showing an embodiment in which an earth leakage breaker for detecting micro leakage current according to an embodiment of the present invention is configured as a general leakage breaker or a return type leakage breaker.
4 is a diagram showing a configuration of a computer device in which a method of sensing a micro leakage current according to an embodiment of the present invention can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is intended to enable a person skilled in the art to readily understand the scope of the invention, and the invention is defined by 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. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

The micro leakage current sensing apparatus according to the embodiment of the present invention performs the functions of a general leakage current breaker and an automatic return type earth leakage breaker and visually compares the leak current amount when a leakage current is generated in a breaker on state and an off state Display. As a result, the amount of leakage current can be known at the time when the electric power of the earth leakage breaker is turned on again (the earth leakage breaker is manually turned on). This makes it possible to determine whether the state of the earth leakage breaker has been manually operated. In addition, if the leakage current is continuously detected even in the off state of the earth leakage breaker, if there is a problem, the power line can be maintained in advance to prevent human and material accidents in advance.

A main feature of the micro leakage current sensing device according to the embodiment of the present invention is that the conventional zero earth leakage breaker and the automatic return type earth leakage breaker use the ZFR (ZCT) to detect and display the amount of leakage current and to use the output of IC for leakage detection only. The leakage current amount display method of the micro leakage current sensing apparatus according to the embodiment includes displaying by the number, color, level or the like using LED, FND, LCD.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a micro leakage current sensing apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.

1 is a diagram illustrating a configuration of an apparatus for sensing a micro leakage current according to an embodiment of the present invention.

Referring to FIG. 1, in a conventional earth leakage circuit breaker or a return type earth leakage circuit breaker according to the embodiment, at least one of a zero-current detection rectifier (ZCT) for detecting a leakage current of an earth leakage breaker or an IC The micro leakage current sensing device for sensing the micro leakage current flowing in the microcomputer includes a ZCT 100, an electrical leakage detection unit 200, a conversion unit 300, a power supply unit 400, a control unit 500, And an operation and automatic control unit 700.

The leakage detecting unit 200 according to the embodiment detects leakage currents of the lines L1 and L2 using at least one of the ZCT 100 and the leakage current detection IC. In addition, the electric leakage detecting unit 200 monitors the output of the ZCT 100 at the time of occurrence of a short circuit, an RF surge, and a power surge, and informs the converting unit of the current output value.

 The conversion unit 300 converts the leakage current data sensed by the leakage detection unit 200. For example, the conversion unit 300 converts the detection result of the leakage detection unit into an analog to digital (A / D) method, and then controls the control unit 500 to calculate the amount of leakage.

The control unit 500 compares the converted leakage current amount with a preset value, controls display information indicating the amount of leakage current according to the comparison result, and is connected to the installed line. The control unit 500 may include a controller or the like capable of performing a series of arithmetic processing processes such as a microcomputer according to an embodiment.

According to the embodiment, the controller 500 is connected to the pre-installed line, receives the power from the pre-installed line even in the off state of the earth leakage breaker, and continuously detects the fine leakage current flowing in the pre- And compares the detected leakage current amount with a predetermined value. The control unit 500 records the off-time of the earth leakage breaker when the off-circuit occurs in the connected earth leakage breaker, determines the abnormal situation when the amount of leakage current is equal to or greater than a predetermined value, Can be recorded. The recording data may be utilized for maintenance of the earth leakage breaker and maintenance of the equipment connected to the earth leakage breaker. It can also be used as data for identifying the cause of failure of a line and an electric device (for example, communication equipment, etc.) connected to the earth leakage breaker.

The display unit 600 displays the amount of leakage current according to the control signal received from the control unit 500. The display unit 600 converts the amount of leakage current into a number and a level according to a control signal received from the control unit 500 and outputs a light emitting diode (LED), a flexible numeric display (FND), a liquid crystal display . For example, when the amount of leakage current is equal to or greater than a preset value, the display unit 600 may display red or the like so that the user intuitively recognizes a dangerous situation, directly displays a leakage current value, Display.

Also, according to the embodiment, the display unit 600 may display the leakage current amount information, and may display the occurrence time of the OFF state of the earth leakage breaker or the occurrence time information of the abnormal state according to the user selection.

The manual operation and automatic control unit 700 processes user setting signals and the like for the micro leakage current amount information display to automatically operate the micro leakage current sensing apparatus according to the embodiment.

2 is a flowchart illustrating a method of sensing a micro leakage current according to an embodiment of the present invention.

Referring to FIG. 2, in a conventional earth leakage circuit breaker or a return-type earth leakage circuit breaker, there is provided a microfluidic sensor for detecting a micro leakage current already flowing in a pre-installed line by using a zero- In order to detect the leakage current, at step S210, a leakage current amount of the pre-installed line is detected by using at least one of the zero-current detector (ZCT) and the leakage current detection IC.

According to an embodiment, when the earth leakage breaker is in a trip state in step S210, power is supplied from a pre-installed line, and the amount of leakage current of the pre-installed line can be detected. In step S210, a trip occurrence time of the earth leakage breaker is recorded when a trip occurs in the earth leakage breaker, and when the amount of leakage current is equal to or greater than a predetermined value, it is determined that the situation is abnormal, .

Thereafter, in step S220, a process of converting the detected leakage current amount is performed.

Thereafter, in step S230, a process of comparing the converted leakage current amount with a preset value is performed.

In step S240, a process of controlling display information indicating the amount of leakage current is performed according to the comparison result.

In step S250, a leakage current amount already flowing in the pre-installed line is converted into a number and a level according to a control signal indicating the amount of leakage current, and is displayed. For example, in step S250, the amount of leakage current may be displayed using a light-emitting diode (LED), a flexible numeric display (FND), or a liquid crystal display (LCD) according to a display control signal indicating the amount of leakage current.

Also, in step S250, the leakage current amount information is displayed, and information on when the electric leakage breaker is turned off or when an abnormal situation occurs can be displayed according to the selection. In this case, the abnormal situation may be a danger that the micro leakage current is higher than a predetermined value, a situation where a trip of the earth leakage breaker occurs, a leakage current, or an excessive leakage current.

3 is a circuit diagram showing an embodiment in which an earth leakage breaker for detecting micro leakage current according to an embodiment of the present invention is configured as a general leakage breaker or a return type leakage breaker. 3 is a circuit diagram of a general earth leakage breaker, FIG. 3B is a circuit diagram showing an automatic return type earth leakage breaker, and FIG. 3C is a circuit diagram showing an apparatus for detecting a micro leakage current according to an embodiment of the present invention to be.

The micro-leakage current sensing apparatus C according to the embodiment shown in FIG. 3 can be driven by the return-type earth-leakage circuit breaker B and can also be driven by the general earth-leakage circuit breaker A.

The micro leakage current sensing apparatus according to an embodiment of the present invention detects a micro leakage current flowing through a line already installed using at least one of a leakage current detection dedicated IC and a Zero Phase Transformer (ZCT) Particularly, in the embodiment according to the present invention, it is possible to detect a minute leakage current by using a dedicated IC for detecting an electrical leak.

As shown in FIG. 3C, when the signal A and the power B are supplied in the circuit breaker on state using the output of the leakage current detection IC, and the circuit breaker is in the off state And receives the signal B in addition to the power B to operate.

First, the controller 30 compares the PWM (Pulse-Width Modulation) output from the IC for detecting an electrical leak current at the time of occurrence of an electrical leak when the electrical leakage circuit breaker is in an on state, The amount of leakage current can be visually displayed.

When the earth leakage breaker is in an off state, the automatic return type earth leakage breaker senses a leakage current occurring on the load side and transmits the leakage current to the control unit 30. Then, the controller compares the leakage current and displays the leakage current visually through the display device (LED, FND, LCD).

Meanwhile, the micro leakage current sensing method according to the embodiment of the present invention may be implemented in a computer system or recorded on a recording medium. 4, the computer system includes at least one processor 121, a memory 123, a user input device 126, a data communication bus 126, a user output device 127, And may include a storage 128. Each of the above-described components performs data communication via the data communication bus 122. [

The computer system may further include a network interface 129 coupled to the network. The processor 121 may be a central processing unit (CPU) or a semiconductor device that processes instructions stored in the memory 123 and / or the storage 128.

The memory 123 and the storage 128 may include various forms of volatile or nonvolatile storage media. For example, the memory 123 may include a ROM 124 and a RAM 125. Therefore, the method of sensing the micro leakage current according to the embodiment of the present invention can be implemented in a computer-executable method.

Meanwhile, the micro leakage current sensing method according to the embodiment of the present invention described above can be implemented as a computer readable code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording media storing data that can be decoded by a computer system. For example, there may be a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device and the like. The computer-readable recording medium may also be distributed and executed in a computer system connected to a computer network and stored and executed as a code that can be read in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (10)

(ZCT) for detecting a leakage current of the earth leakage breaker or an IC for detecting an electric leakage, which is provided in a general earth leakage breaker or a return-type earth leakage breaker, for detecting a minute leakage current already flowing in a pre- In a leakage current sensing device,
An electrical leak detecting unit for detecting an amount of leakage current of the line using at least one of the image transformer (ZCT) and an electrical leak detecting IC;
A conversion unit for converting leakage current amount data detected by the leakage detection unit;
A control unit for controlling display information for comparing the converted leakage current amount with a predetermined value and informing the leakage current amount according to the comparison result, and connected to the pre-installed line; And
A display unit for displaying the leakage current amount according to a control signal received from the control unit; Including the
The control unit
And recording the time of occurrence of the abnormal situation by determining that the leakage occurrence time of the leakage circuit breaker is equal to or greater than a predetermined value as an abnormal situation when the occurrence of the off state occurs in the leakage circuit breaker A micro leakage current sensing device.
The apparatus of claim 1, wherein the control unit
The microcomputer is connected to the pre-installed line, receives the power from the pre-installed line even in the off state of the earth leakage breaker, continuously detects the micro leakage current flowing in the pre-installed line, And comparing the calculated value with a set value.
The display device according to claim 1, wherein the display unit
(LED), an FND (Flexible Numeric Display), and an LCD (Liquid Crystal Display) according to a control signal received from the control unit. Leakage current sensing device.
delete The display device according to claim 1, wherein the display unit
And displays the leakage current amount information and information on the occurrence time of the OFF state of the earth leakage breaker or the time of occurrence of the abnormal state according to the selection.
A micro leakage current sensing method for detecting a micro leakage current already flowing in a pre-installed line by using a zero current transformer (ZCT) for leakage current detection and a leakage current detection IC in a general earth leakage breaker or a return type earth leakage breaker,
Detecting a leakage current amount of the pre-installed line using at least one of the image current transformer (ZCT) and an IC for leakage detection;
Converting the sensed amount of leakage current;
Comparing the converted leakage current amount with a preset value, and controlling display information indicating the leakage current amount according to the comparison result;
Displaying a leakage current amount already flowing in the pre-installed line according to a control signal for displaying the leakage current amount; Lt; / RTI >
The step of detecting the leakage current amount of the pre-installed line
And recording a time when a trip occurred in the earth leakage breaker when a trip occurs in the earth leakage breaker and a time when the abnormality occurs when the leakage current amount is equal to or greater than a predetermined value is determined as an abnormal situation, Current sensing method.
7. The method of claim 6, wherein the step of sensing a leakage current amount of the pre-
And detecting the amount of leakage current of the pre-installed line by receiving power from the pre-installed line when the circuit breaker is in a tripped state.
7. The method of claim 6, wherein displaying the amount of leakage current comprises:
(LED), an FND (Flexible Numeric Display), and an LCD (Liquid Crystal Display) according to a display control signal indicating the leakage current amount. A method for detecting micro leakage current.
delete 7. The method of claim 6, wherein displaying the amount of leakage current comprises:
Wherein the leakage current amount information is displayed and information on the occurrence time of the OFF state of the earth leakage breaker or the time of occurrence of the abnormality is displayed according to the selection.
KR1020150040881A 2015-03-24 2015-03-24 Device for Detecting the Micro-Leakage Current and Method for Detecting Micro-Leakage Current at Already Installed on Track KR101550824B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102145826B1 (en) * 2020-02-26 2020-08-19 동아전기공업 주식회사 Leakage current detection sensitivity adjustable zct
KR20230139098A (en) * 2022-03-25 2023-10-05 삼현씨앤에스 주식회사 Surge protect device with auto recovery means

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003217433A (en) * 2002-01-18 2003-07-31 Mitsubishi Electric Corp Ground fault interrupter with leakage current measuring display device
JP2010086747A (en) * 2008-09-30 2010-04-15 Panasonic Electric Works Co Ltd Earth leakage detector, and switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003217433A (en) * 2002-01-18 2003-07-31 Mitsubishi Electric Corp Ground fault interrupter with leakage current measuring display device
JP2010086747A (en) * 2008-09-30 2010-04-15 Panasonic Electric Works Co Ltd Earth leakage detector, and switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102145826B1 (en) * 2020-02-26 2020-08-19 동아전기공업 주식회사 Leakage current detection sensitivity adjustable zct
KR20230139098A (en) * 2022-03-25 2023-10-05 삼현씨앤에스 주식회사 Surge protect device with auto recovery means
KR102652104B1 (en) 2022-03-25 2024-03-29 삼현씨앤에스 주식회사 Surge protect device with auto recovery means

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