KR102620379B1 - Automatic earth apparatus with micro-current detecting and eliminating - Google Patents

Abstract

The present invention relates to an automatic grounding device with a microcurrent detection and removal function, and more specifically, to a transformer base, switchboard (high-voltage panel, low-voltage panel), MCC panel, distribution panel, instrumentation control panel, automatic control panel, and UPS (Uninterruptible Power Supply). ), ESS (Energy Storage System), BIPV (Building Integrated Photovoltaic System), solar power generation device, generator operation panel, power converter, etc. (hereinafter referred to as 'distribution panel') detects micro-current flowing through the door of the enclosure, and detects the detected It relates to an automatic grounding device that removes microcurrent by guiding it to ground and has a microcurrent detection and removal function that can monitor and display the condition inside the enclosure.
An automatic grounding device with a microcurrent detection and removal function according to the present invention to solve the above problems includes a microcurrent detection unit that detects a signal of a microcurrent flowing through the enclosure and the first grounding wire on the earth side; a control unit that determines the harmfulness of the signal detected by the microcurrent detection unit; and a grounding unit that connects a second grounding wire according to the judgment result of the control unit to allow the microcurrent of the enclosure door to flow to the ground.

Description

Automatic grounding device with microcurrent detection and removal function {AUTOMATIC EARTH APPARATUS WITH MICRO-CURRENT DETECTING AND ELIMINATING}

The present invention relates to an automatic grounding device with a microcurrent detection and removal function, and more specifically, to a transformer base, switchboard (high-voltage panel, low-voltage panel), MCC panel, distribution panel, instrumentation control panel, automatic control panel, and UPS (Uninterruptible Power Supply). ), ESS (Energy Storage System), BIPV (Building Integrated Photovoltaic System), solar power generation device, generator operation panel, power converter, etc. (hereinafter referred to as 'distribution panel') detects micro-current flowing through the door of the enclosure, and detects the detected It relates to an automatic grounding device that removes microcurrent by guiding it to ground and has a microcurrent detection and removal function that can monitor and display the condition inside the enclosure.

In general, a switchboard is installed in facilities such as buildings, indoors or outdoors in factories, large buildings, or substations that use a lot of electricity. It is a device necessary to control the operation of generators, transformers, etc., and turn off the power generated. and instruments are arranged and fixed.

These switchboards are installed in the electrical facilities of buildings of a certain size or larger and prevent safety accidents such as electric shock or fire to the human body by blocking or controlling the flow of excessive current to the load due to short circuits or ground faults in the distribution system and various branch lines. do.

When the switchboard is in operation, leakage current may occur due to other causes such as induced current, EMI (electromagnetic interference) filter, and design/failure. The voltage and current of this leakage current vary from device to device, but in particular, the stability of the device and the safety of the user cannot be guaranteed.

In the conventional switchboard, a leakage current detection device is installed to display the leakage status step by step according to the set value, allowing managers to easily observe the leakage current for each line with the naked eye, thereby efficiently managing the safety of electrical facilities. It is designed to prevent product damage and power loss due to leakage current, and to prevent safety accidents due to neglect of switchboard management.

In addition, the enclosure of the switchboard must be equipped with a separate grounding structure in accordance with electrical construction laws and regulations to prevent electric shock due to leakage current that may occur due to the flow of electricity. Generally, a separate grounding structure is installed on one side of the main body of the switchboard. It is equipped with an earth bus bar, through which it is grounded to the ground.

As a grounding device applied to a switchboard, a switchboard grounding device was disclosed in Registered Patent Publication No. 10-1181513.

This technology is configured to guide the leaked current to the ground through the grounding bus in the main body when a short circuit occurs in the switchboard door, and to electrically connect the second grounding rod to monitor whether there is an electrical short circuit.

However, this technology requires the operator to directly manipulate the rotation of the grounding rod, which increases the risk of electric shock during operation, and has the disadvantage of not being able to check the condition inside the switchboard.

In addition, due to aging, oxidation, poor contact, and corrosion of the pre-installed grounding device, the door of the main body may be charged with microcurrent in a different form from the leakage current, and safety accidents may occur due to microcurrent charged in the door. You can.

Registered Patent Publication No. 10-1181513 (2012. 09. 04.)

The present invention was created to solve the above problems, and the problem to be solved by the present invention is to constantly detect microcurrent in the door of a cabinet such as a switchboard, and to remove the microcurrent by guiding it to a separate ground wire when the microcurrent is detected. The purpose is to provide an automatic grounding device with a microcurrent detection and removal function.

In addition, we provide an automatic grounding device with a microcurrent detection and removal function that can detect a moving object approaching the enclosure through a proximity sensor and ground the enclosure door through the operation of the automatic grounding device when it approaches within a predetermined distance. there is.

In addition, the purpose is to provide an automatic grounding device with a microcurrent detection and removal function that can display the operating status inside the switchboard to the outside and take safety measures according to the opening of the enclosure door.

An automatic grounding device with a microcurrent detection and removal function according to the present invention to solve the above problems includes a microcurrent detection unit that detects a signal of a microcurrent flowing through the enclosure and the first grounding wire on the earth side; a control unit that determines the harmfulness of the signal detected by the microcurrent detection unit; and a grounding unit that connects a second grounding wire according to the judgment result of the control unit to allow the microcurrent of the enclosure door to flow to the ground.

Here, the control unit includes an amplification module that amplifies the signal detected by the microcurrent detection unit; an AD conversion module that converts the analog signal, which is the signal amplified by the amplification module, into a digital signal; a control module that determines whether the digital signal converted by the AD conversion module is harmful to the human body; an operation module that outputs an operation signal to operate the ground unit based on the judgment result of the control module; and an output module that outputs a visual or auditory signal based on the decision result of the control module.

In addition, it further includes an approach detection unit that detects a person approaching the door, and the control unit is configured to display whether the inside of the enclosure is energized or to operate the grounding unit based on the distance detected by the approach detection unit. It can be.

At this time, if the detected distance approaches within the first distance, the control unit displays the driving situation inside the enclosure, and if it is determined that the driving situation is energized, it outputs a voice, and the detected distance approaches the first distance. When approaching within 2 distances, the control unit displays the operating status inside the enclosure, outputs an audio signal when the operating status is determined to be energized, and outputs a control signal to connect the second ground wire to generate a microcurrent in the enclosure. It is characterized by controlling the flow to the ground.

In addition, the first ground wire is an electric path connecting the enclosure and the ground, and the second ground wire is an electric path connecting the door of the enclosure and the earth.

According to the present invention, the microcurrent of the enclosure door can be detected at all times and the microcurrent can be removed by guiding it to a separate ground wire when the microcurrent is detected, so there is an advantage in preventing electric shock caused by contact with the door. .

In addition, since it is configured to ground the enclosure door based on the approach of the enclosure door, there is an advantage in that the microcurrent in the enclosure door can be removed even if an error occurs when detecting the microcurrent.

In addition, there is an advantage of being able to check the energization and power outage status inside the enclosure from the outside and prepare for opening the enclosure door.

1 is a configuration diagram of an automatic grounding device with a microcurrent detection and removal function according to the present invention applied to a switchboard;
Figure 2 is a schematic configuration diagram of an automatic grounding device with microcurrent detection and removal functions according to the present invention;
Figure 3 is a configuration diagram of an automatic grounding device with microcurrent detection and removal functions according to the present invention;
Figure 4 is a circuit diagram of an embodiment of an amplification module applied to an automatic grounding device with a microcurrent detection and removal function according to the present invention;
Figure 5 is a front configuration diagram of the control unit applied to the automatic grounding device with microcurrent detection and removal function according to the present invention;
Figure 6 is a perspective view of the grounding portion applied to the automatic grounding device with microcurrent detection and removal function according to the present invention;
Figure 7 is an internal perspective view of the grounding portion applied to the automatic grounding device with microcurrent detection and removal function according to the present invention;
Figure 8 is a front view of the inner side of the grounding part applied to the automatic grounding device with microcurrent detection and removal function according to the present invention;
Figure 9 is a diagram showing the operating state of the grounding unit applied to the automatic grounding device with microcurrent detection and removal function according to the present invention.

Next, a preferred embodiment of an automatic grounding device with a microcurrent detection and removal function according to the present invention will be described in detail with reference to the drawings.

Hereinafter, the same reference numerals will be used for technical elements performing the same function, and repeated detailed descriptions will be omitted to avoid redundant description.

In addition, the examples described below are illustrative in order to effectively demonstrate preferred embodiments of the present invention, and should not be construed to limit the scope of the present invention.

The present invention relates to an automatic grounding device with a microcurrent detection and removal function, and more specifically, to an enclosure of a transformer base, a low-voltage transformer base, an MCC panel, an instrumentation control panel, an automatic control panel, and a distribution board (hereinafter referred to as a 'distribution board'). This relates to an automatic grounding device that has a microcurrent detection and removal function that can detect microcurrent flowing in a door, guide the detected microcurrent to ground and remove it, and monitor and display the condition inside the enclosure.

Figure 1 is a configuration diagram of an automatic grounding device with a microcurrent detection and removal function according to the present invention applied to a distribution board, and Figure 2 is a schematic configuration of an automatic grounding device with a microcurrent detection and removal function according to the present invention. This is a drawing showing .

Referring to the attached FIGS. 1 and 2, the automatic grounding device with a microcurrent detection and removal function according to the present invention includes a microcurrent detection unit 100, a control unit 200, and a grounding unit 300.

The microcurrent detection unit 100 detects a signal of a microcurrent flowing through the enclosure 10 and the first ground wire 101 on the earth side.

The first ground wire 101 is a circuit connecting the enclosure 10 and the ground, and is a grounding facility specified in the KEC standard.

In the KE standard, it is classified into type 1 grounding, type 2 grounding, type 3 grounding, and special type 3 grounding depending on power reception and distribution, and the line thickness and grounding resistance are determined according to each grounding.

The micro-current detection unit 100 is for detecting micro-current flowing in the first ground wire 101, and a CT (Current Transformer) can be used to detect the micro-current in the first ground wire 101, which is a line. .

The control unit 200 performs a function of determining the harmfulness of the signal detected by the microcurrent detection unit 100.

Figure 3 is a diagram showing the configuration of an automatic grounding device with microcurrent detection and removal functions according to the present invention.

Referring to the attached FIG. 3, the control unit 200 applied to the automatic grounding device with a microcurrent detection and removal function according to the present invention includes an amplification module 210, an AD conversion module 220, a control module 230, and an operation. It is comprised of a module 240, an output module 250, and a communication module 260.

The amplification module 210 amplifies the signal of the microcurrent detected by the microcurrent detection unit 100.

Figure 4 is a circuit diagram of an embodiment of an amplification module applied to an automatic grounding device with a microcurrent detection and removal function according to the present invention.

Referring to the attached FIG. 4, the amplification module 210 may be composed of a two-stage amplification circuit.

The current flowing through the first ground line 101 is very small. In addition, since the microcurrent detection unit 100 composed of a CT detects the primary current of the first ground line 101 by inducing it to the secondary side, the detected signal is very fine. Therefore, the voltage at both ends of the detection impedance (e.g., shunt resistor) must be amplified.

In addition, the amplification module 210 must have a frequency range sufficient to detect a microcurrent signal by applying an operational amplifier, and must be configured to have a low noise level.

Accordingly, the amplification module 210 applied to the present invention may be configured as a two-stage amplification circuit with an input offset voltage of 3 mV and an amplification degree of 40 dB.

Additionally, a low-pass filter may be configured on the output side of the amplification module 210 to pass microcurrent signals and take external or internal radiation noise into consideration.

The AD conversion module 220 converts the analog signal, which is a microcurrent signal amplified and output from the amplification module 210, into a digital signal.

The AD conversion module 220 divides the bits of the digital signal converted into high-order bits and low-order bits according to the size of the output amplified signal, converts them into digital signals, and combines each of the converted high-order bits and low-order bits. It can be configured to be converted into a digital signal.

More specifically, a preprocessing circuit that divides the converted digital signal into upper bits and lower bits according to the number of bits, and compares whether the size of the input analog signal falls into either the upper bit or lower bit, and the preprocessing circuit. Based on the comparison results, a bit operation circuit consisting of an upper bit operation module and a lower bit operation module is corrected for the gain error of the upper bit and lower bit operated by the bit operation circuit, and the upper bit and the lower bit are combined. It may be configured to include a digital signal generation circuit that generates a digital signal.

The control module 230 determines whether the digital signal converted by the AD conversion module 220 is harmful to the human body.

In general, a current of 0.5 mA or less and a voltage of 30 V or less are defined as safety current and safety voltage, respectively. In addition, the operation standard for earth leakage circuit breakers to prevent electric shock is specified to be within 0.03 seconds at 30mA.

Accordingly, the control module 230 may be configured to determine the harmfulness to the human body based on a microcurrent of 30 mA based on the converted digital signal.

That is, if the micro-current detected by the micro-current detection unit 100 is determined to be 30 mA or less, it is determined to be a safe current, and if it is determined to exceed 30 mA, it can be configured to be determined to be a harmful current.

The operation module 240 outputs an operation signal to operate the ground unit 300 based on the determination result of the control module 230.

At this time, the operation signal may be a trigger signal that operates the ground unit 300, and the ground unit 300 is operated according to the trigger signal so that the second ground wire 102 connects the door of the enclosure to the ground. do.

The output module 250 outputs a visual or auditory signal based on the decision result of the control module 230, and includes a display 251 that performs visual output in text, and a speaker that performs auditory output in voice ( 252) and a lamp 253 that performs visual output with a blinking light.

Figure 5 is a diagram showing the front configuration of the control unit applied to the automatic grounding device with microcurrent detection and removal function according to the present invention, (a) of Figure 5 shows the output screen when energized, and (b) shows the output screen during a ceasefire.

Referring to the attached FIG. 5, the front side of the control unit 200 includes a display 251 that provides visual output in text, a speaker 252 that provides auditory output in voice, and a lamp 253 that provides visual output in the form of a flashing light. ) is composed.

The characters displayed on the display 251 are selected between energization and truce.

In other words, if the power applied to the enclosure is distributed depending on whether the power is energized, it is displayed as “energized,” and if it is not distributed, it is displayed as “out.”

At this time, the control unit 200 is selected from “energizing” or “outgoing” based on the current or voltage output from a separate current transformer (CT, Current Transformer) or transformer (PT, Potential Transformer) configured in the enclosure. One character is displayed.

Accordingly, the user can check the internal situation of the box by visually checking the characters displayed as “in power” or “in truce.”

The speaker 252 outputs a warning sound or a warning guidance sound, and even if the user cannot perceive the situation displayed on the display 251 by hearing, he or she can recognize it through voice.

The lamp 253 is displayed as a lamp in connection with the character displayed on the display 251, and is a red lamp 253a that is displayed in red in connection with the character displayed on the display 251 when "energizing." ) and a green lamp (253b) that is displayed in green in connection with the case of “armistice.”

Accordingly, by visually or audibly displaying the operating situation inside the enclosure to the outside through the output module 250, it is possible to make the user aware in advance so that he or she can perform safe work.

The communication module 260 transmits the results determined by the control module 230 to a remote human machine interface (HMI) through a wired or wireless communication network under the control of the control module 230.

In the above, wired and wireless communication networks such as RS-485, Ethernet, and Wi-Fi may be applied, and the HMI may be composed of a server or terminal.

At this time, the server 300 is remotely connected to the automatic grounding device of the present invention through a communication network, and can be configured to integratedly manage a plurality of automatic grounding devices.

In the above, the terminal is a variety of terminals such as smartphones, laptops, PDAs, and wearable devices installed with a dedicated application that displays information received from the automatic grounding device through a communication network or transmits a control signal to the automatic grounding device remotely. It can be applied.

Meanwhile, in the present invention, an alarm may be output audibly and visually to a person (for example, a user, etc.) approaching the enclosure based on the distance between the enclosure and the person.

Accordingly, the control unit 200 further includes an approach detection unit 400 (see FIG. 3).

The approach detection unit 400 performs a function of detecting and outputting a movement approaching the door (or the front of the enclosure).

The approach detection unit 400 may be composed of an ultrasonic sensor.

The ultrasonic sensor transmits ultrasonic waves, measures the point at which the transmitted ultrasonic waves are reflected and received, and can calculate the distance based on time and ultrasonic speed.

Accordingly, the ultrasonic sensor includes an ultrasonic transmission unit 410 that transmits the generated ultrasonic waves and an ultrasonic reception unit 420 that receives a reflected wave of the ultrasonic waves transmitted from the ultrasonic transmission unit 410.

The ultrasonic transmitting unit 410 and the ultrasonic receiving unit 420 are exposed to the front of the control unit 200 (see FIG. 5) and approach the detection range of the ultrasonic transmitting unit 410 and the ultrasonic receiving unit 420. Detects people and objects.

Based on the distance detected by the approach detection unit 400 to which the ultrasonic sensor is applied, the control unit 200 is configured to display whether the inside of the enclosure is energized or to operate the ground unit 300.

At this time, the control unit 200 can be operated in three modes, namely caution mode, warning mode, and standby mode, depending on the sensing distance.

1. Alarm mode

The alarm mode is a mode that is switched when the distance detected by the approach detection unit 400 approaches within a first distance.

That is, when the sensed distance approaches within the first distance, the control unit 200 displays the driving situation inside the enclosure, and when it is determined that the driving situation is energized, it controls the sound output.

At this time, the first distance may be set within the range of 1.5m ± 0.2.

To elaborate, when the control unit 200 determines that a moving object (such as a person or device) detected by the approach detection unit 400 approaches within a first distance, it displays the driving situation inside the enclosure on the display 251. Control it to do so. Additionally, when it is determined that the driving situation is energized, the control unit 200 controls voice output through the speaker 252.

The alarm mode determines that there is a possibility of a person or object approaching the enclosure and outputs an alarm signal in advance.

2. Warning mode

The warning mode is a mode that is switched when the distance detected by the approach detection unit 400 approaches within the second distance.

That is, when the sensed distance approaches within the second distance, the control unit 200 displays the driving situation inside the enclosure, and when it is determined that the driving situation is energized, it controls the sound output.

At this time, the first distance may be set within the range of 1.0m ± 0.1.

To elaborate, when the control unit 200 determines that a moving object (such as a person or device) detected by the approach detection unit 400 approaches within a second distance, it displays the driving situation inside the enclosure on the display 251. Control it to do so. Additionally, when it is determined that the driving situation is energized, the control unit 200 controls voice output through the speaker 252. In addition, the control unit 200 outputs a control signal so that the second ground wire is connected to control the microcurrent from the enclosure to flow to the ground.

In the warning mode, it is determined that a person or object is clearly approaching the enclosure, and the enclosure door is grounded while performing the control operation of the alarm mode.

That is, when a person (such as a worker or user) approaches the enclosure and the distance between the person and the door approaches within the second distance, the door is configured to be grounded, so that even if a detection error occurs in the microcurrent detector 100, the door is closed. Grounding ensures user safety.

3. Standby mode

The standby mode is a mode that is switched when the distance detected by the approach detection unit 400 becomes farther than the first distance.

That is, when a person (such as a worker or user) moves away from the door of the enclosure by a first distance or more, the control unit 200 determines that the person is at a safe distance from the enclosure and switches to the standby state.

Next, the ground portion 300 will be described.

The grounding unit 300 performs the function of connecting the second grounding wire according to the judgment result of the control unit 200 to allow the microcurrent of the enclosure door to flow to the ground, and turns the second grounding wire from the off state into the on state. Switch to connect the enclosure door to the ground.

Figure 6 is a perspective view of the grounding portion applied to the automatic grounding device with microcurrent detection and removal function according to the present invention, Figure 7 is an internal perspective view, and Figure 8 is a front view of the inside.

Referring to the attached FIGS. 6 to 8, the ground portion 300 includes a casing 310, an input terminal 320, an output terminal 330, a mover 340, an elastic body 350, and an operation module 360. It is composed including.

The casing 310 has a predetermined shape and its interior forms a space.

The input terminal 320 is partially exposed on one side of the casing 410, and the primary side of the second ground wire 102 (see FIG. 2) is electrically connected to the exposed portion.

The output terminal 330 is installed in the casing 310 facing the input terminal 320, and a portion is exposed on the other side of the casing 310, and the exposed portion has a second ground wire 102 (Figure 2). The secondary side of (see 2) is electrically connected.

The mover 340 is rotatably installed between the input terminal 320 and the output terminal 330, and electrically connects the input terminal 320 and the output terminal 330 through a predetermined rotation.

The elastic body 350 elastically (tensilely) supports the mover 340 so that the mover 340 is spaced apart from the input terminal 320 and the output terminal 330, and is located on the input terminal 320 side. A first spring 351 disposed on the side of the output terminal 330 to elastically (tensilely) support the movable element 340 and a second spring ( 352).

The first spring 351 and the second spring 352 shown in FIG. 8 are shown as tension springs that pull the mover 340, but compression springs may be used depending on design conditions. am.

At this time, as the mover 340 is rotatably installed, both the first spring 351 and the second spring 352 are installed, or a selected one of the first spring 351 and the second spring 352 is installed. Only one spring can be installed.

In the above, an insulator (not shown) for insulation is formed at a portion where the first spring 351 and the second spring 352 are in contact with the mover 340.

The operation module 360 is rotated at a predetermined angle based on the input operation signal so that both ends of the mover 340 contact or are separated from the input terminal 320 and the output terminal 330. A motor controller 361 that controls the operation signal, a motor 362 that rotates the rotation axis at a predetermined angle based on the control signal of the motor controller 361, and a motor 362 installed on the rotation axis of the motor 362 and the mover ( It is configured to include an eccentric rotor 363 in contact with 340).

At this time, the motor 362 can rotate forward and backward, and a servo motor that can rotate only up to a specified angle can be applied.

Referring to the attached FIG. 8, it shows a state where both ends of the mover 340 are spaced apart from the input terminal 320 and the output terminal 330, and the second ground wire 102 is open. It is shown.

The control module 230 of the control unit 200 determines whether the digital signal converted by the AD conversion module 220 is harmful to the human body, and if it is determined to be harmful, the operation module 240 determines whether the digital signal converted by the AD conversion module 220 is harmful to the human body. Based on the results, an operation signal for operating the ground unit 300 is output.

The operation signal is input to the motor controller 361 of the operation module 360, and the motor controller 361 drives the motor 362 through the control signal.

By driving the motor 362, the eccentric rotor 363 connected to the rotation axis of the motor 362 rotates, and the movable member 340 rotates due to the rotation of the eccentric rotor 363. The input terminal 320 and the output terminal 330 are electrically connected.

Figure 9 is a diagram showing the operating state of the grounding unit applied to the automatic grounding device with microcurrent detection and removal function according to the present invention.

Referring to the attached FIG. 9, the mover 340 rotates according to the operation of the operation module 360, and the input terminal 320 and the output terminal 330 are electrically connected.

Accordingly, the enclosure door 20 (see FIG. 1) is grounded to the ground, and the microcurrent charged in the door 20 flows to the ground.

According to the present invention, the microcurrent of the enclosure door can be detected at all times and the microcurrent can be removed by guiding it to a separate ground wire when the microcurrent is detected, so there is an advantage in preventing electric shock caused by contact with the door. .

In addition, since it is configured to ground the enclosure door based on the approach of the enclosure door, there is an advantage in that the microcurrent in the enclosure door can be removed even if an error occurs when detecting the microcurrent.

In addition, there is an advantage of being able to check the energization and power outage status inside the enclosure from the outside and prepare for opening the enclosure door.

In the above, a preferred embodiment of the automatic grounding device having a microcurrent detection and removal function according to the present invention has been described, but the present invention is not limited thereto, and includes various options within the scope of the claims, description of the invention, and accompanying drawings. It is possible to carry out various modifications, and this also falls within the scope of the present invention.

10: enclosure 20: door
101: first ground wire 102: second ground wire
100: Microcurrent detection unit 200: Control unit
210: Amplification module 220: AD conversion module
230: control module 240: operation module
250: Output module 300: Ground part
310: Casing 320: Input terminal
330: output terminal 340: mover
350: elastic body 360: operation module
400: Approach detection unit

Claims (5)

A microcurrent detection unit 100 that detects a signal of a microcurrent flowing through the enclosure and the first grounding line on the earth side;
A control unit 200 that determines the harmfulness of the signal detected by the microcurrent detection unit 100; and
A grounding unit 300 that connects a second grounding wire according to the judgment result of the control unit 200 to allow the microcurrent of the enclosure door to flow to the ground;
Including,
The first ground wire is a conductor connecting the enclosure to the ground,
The second grounding wire is an automatic grounding device with a microcurrent detection and removal function, wherein the second grounding wire is a circuit connecting the door of the enclosure and the earth.
In claim 1,
The control unit 200,
An amplification module 210 that amplifies the signal detected by the microcurrent detection unit 100;
an AD conversion module 220 that converts the analog signal, which is the signal amplified by the amplification module 210, into a digital signal;
a control module 230 that determines whether the digital signal converted by the AD conversion module 220 is harmful to the human body;
an operation module 240 that outputs an operation signal to operate the ground unit 300 based on the determination result of the control module 230; and
An output module 250 that outputs a visual or auditory signal based on the determination result of the control module 230;
An automatic grounding device with a microcurrent detection and removal function, comprising:
In claim 1,
An approach detection unit 400 that detects a person approaching the door;
It further includes,
The control unit 200,
An automatic grounding device with a microcurrent detection and removal function, characterized in that it displays whether the inside of the enclosure is energized or operates the grounding unit (300) based on the distance detected by the approach detection unit.
In claim 3,
The control unit 200,
When the detected distance approaches within the first distance, the control unit 200 displays the driving situation inside the enclosure and outputs a voice when it is determined that the driving situation is energized,
When the sensed distance approaches within the second distance, the control unit 200 displays the driving situation inside the enclosure, outputs an audio signal when it is determined that the driving situation is energized, and controls the second ground wire to be connected. An automatic grounding device with a microcurrent detection and removal function that outputs a signal to control the microcurrent in the enclosure to flow to the ground.
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