KR101002622B1 - Virtual grounding device which needs not be buried under ground and method thereof - Google Patents

Abstract

PURPOSE: A virtual grounding device and a grounding method thereof are provided to use a utility power line as a ground line by easily distinguishing a ground line among two power lines. CONSTITUTION: A ground sensor(10) is connected to a virtual ground sensor of an electrical appliance. A line detector(20) comprises first and second detectors(21,23) and first and second switches(22,24). The first detector is connected between the first power line and the ground sensor. The second detector is connected between the second power line and the ground sensor. The first switch is arranged between the first power line and the ground sensor and is conducted with the power detection signal of the second detector. The second switch is arranged between the second power line and the ground sensor and is conducted with the power detection signal of the first detector.

Description

Virtual Grounding Device Which needs not be buried Under ground And Method Thereof}

The present invention relates to a virtual grounding device of the buried landless method and a method thereof, and particularly, in a simple facility or a mobile installation, a commercial ground can be utilized as a good grounding wire in any environment by easily distinguishing a grounding wire among two strands of a power line. It's about technology that makes it possible.

With the development of information and communication, the automation and efficiency of production lines are progressing greatly. In addition, in the field of information and communication, high performance and diversification have been made, and a multimedia society that constitutes a wide area network has been realized. As the social system's dependence on electrical energy and information and communication increases, the damage pattern of lightning strikes is also changing in various ways.

Therefore, in the modern industrialized social system, social demand for stable supply of electricity and qualitative information communication network is increasing due to advanced information, urban functionalization, and high-tech use of electric energy. Among them, surge damage caused by brain discharge accounts for a large portion.

Grounding is indispensable for the reliable operation and life-saving of advanced electronic equipment from electrical accidents and transients such as lightning, surges, static electricity, noise, and ground faults.

1 is an example of a grounding method of grounding a traditional ground, and when power is supplied through a transformer, the customer distributes it in a distribution board and distributes power to the corresponding electric and electronic equipment. In consideration of the above problem, the customer has a separate ground terminal (G) in addition to the transformer ground line (N).

Conventional grounding is performed by embedding ground electrodes (ground rods, ground copper plates, bare copper wires) after boring or digging the ground, which requires a large area and a lot of construction cost and construction period for the grounding electrodes. Especially in urban areas, it is very difficult to embed the grounding electrode due to the limitation of construction area, and because the building is composed of high floors, it is expensive and difficult to construct the grounding wire by laying the grounding electrode from the basement or floor. Follow.

In particular, in a simple facility or a mobile facility installed outdoors, the grounding device embedded in the ground is difficult to install or very cumbersome, and is neglected to cause a person to be exposed to an electric shock or a brain surge.

In order to solve this problem, Korean Patent No. 10-0599359 has proposed a grounding device that does not need to be buried in the ground, two embodiments of such a grounding device is shown in Figs.

Referring to the embodiment of FIG. 2, the conventional grounding device 130 includes a discharge device 250 installed in the grounding box 131. The abnormal current generated from the grounded equipment such as the electrical equipment 131a, the electronic equipment 131b, and the communication equipment 131c is connected to the main ground board (MGB) terminal of the ground box 131 through the ground terminal board 140. Flow.

The MGB terminal of the ground box 131 is connected to the upper electrode plate 132 of the discharge device 250. The discharge device 250 includes two electrode plates 132 and 133 which are installed to face each other, and an electrode plate ( And a plurality of discharge electrodes 139 protruding from the 132 and 133, and a catalyst 137 filling the discharge electrodes 139. Since the discharge electrode 139 has a large area in contact with the catalyst 137, the discharge is rapidly generated and eventually connected to the upper electrode plate 132 and the lower electrode plate 133 so as to increase the discharge capacity.

A plurality of hot wires 138 are provided between the upper electrode plate 132 and the lower electrode plate 133 to connect them in series. As a result, abnormal current flowing from the ground terminal board 140 is quickly converted into thermal energy and discharged. This is done more smoothly.

In the embodiment of FIG. 3, LC filters 252a and 252b are installed as filters between the MGB terminal and the discharge device 250 and between the N terminal and the discharge device 250 in the basic embodiment of FIG. 2. A function of lowering the combined impedance of the electrode 139 and the heating wire 138, a function of removing noise introduced from the transformer 110 into the grounded equipment 131a, 131b, and 131c, and a grounded equipment 131a, 131b, and 131c. The noise generated by the power supply unit 253a, 253b, 253c is installed in series between the L terminal and each discharge device 250, such as a varistor, a gas tube, a zener diode, and the like. , Between the N terminal and the L terminal, and between the L1, L2, and L3 terminals, the constant voltage elements 255a, 255b, and 255c are installed in parallel to the discharge device 250, thereby providing grounding facilities 131a, 131b, 131c, and 150. Transient abnormal voltages such as lightning, surge, static electricity, and noise introduced into the battery are discharged by the discharge device 250. The ability to protect the blood over the ground equipment (131a, 131b, 131c, 150) is provided additionally.

However, according to the prior art, the following three problems occur, and these problems become more problematic in simple facilities or mobile facilities.

 First, connect L1, L2, L3, and N phases correctly.

Second, in utilizing the N-phase ground, the coil and the capacitor 252a to the discharge electrode 250 to the coil and the capacitor 252b are connected in series, and the impedance of the coil and the capacitor parallel circuits 252a and 252b is grounded. The resistance may be affected, and in particular, the ground terminal board 140 via the virtual ground circuit MGB is not connected to the actual ground until the discharge electrode reaches a voltage capable of discharging.

   The problem of such a circuit is that, in a large surge such as a thunder surge, the discharge electrode 250 may discharge to achieve a predetermined purpose, but the discharge electrode 250 does not discharge in a small current caused by a short circuit, and thus the efficiency of grounding is less effective in preventing a human electric shock. there is a problem.

 Third, when the two lines supplying general commercial power are the first power line and the second power line, it is difficult to distinguish which line is P-phase or N-phase without a measuring device. There is a possibility that it will change, and there is a problem that the division is not clear in reality.

Due to the above problem, the grounding device which is not buried in the ground by the prior art has a problem that cannot completely solve the problems of human electric shock and surge damage.

The present invention is to solve the above problems, the present invention actively responds to the environment where the line (L) of the power source and the ground (N) of the power source can be changed, such as a mobile device, the ground (N) of the power source Since the phase and virtual ground (V, G) are physically connected so that they can always act as ground, it perfectly responds to the prevention of human electric shock and brain surge, making it easier to manufacture than the grounding method that is not buried in the conventional earth. The purpose is to make it possible.

According to a preferred aspect of the present invention for achieving the above object, the first power line and the second power line for supplying a commercial power source for separating the signal line and the ground line, located to face the ground and virtual ground The ground sensor and one end of the metal body connected to the terminal are respectively connected to the first power line and the second power line, and the other end is connected to the ground sensor. Thus, a groundless virtual grounding device is provided, comprising a line detector for electrically connecting a low voltage power line and the ground sensor.

The line detector may include a first detector connected between the first power line and the ground sensor and outputting a power detection signal, a second detector connected between the second power line and the ground sensor and outputting a power detection signal; It is installed between the first power line and the ground sensor, and is provided between the first switch and the second power line and the ground sensor which are turned on when a power detection signal is input from the second detector, and the power is supplied from the first detector. It is preferable to include a second switch that is turned on when a detection signal is input.

In addition, the first detector and the second detector are more preferably in the form of the first and second capacitors connected in series to output the detection signal at both ends of the second capacitor.

Further, it is more preferable that a surge protection device is provided between the first power line and the second power line, between the first power line and the ground sensor, and between the second power line and the ground sensor.

According to another aspect of the present invention for achieving the above object, a first detector and a first switch is installed between the first power line and the ground sensor, and the second detector and the second sensor between the second power line and the ground sensor. And a second switch, wherein when a power signal is applied to the first power line and a ground signal is applied to the second power line, the first detector outputs a power detection signal to conduct the second switch to conduct the second switch. When the power line is connected to the ground sensor, when a power signal is applied to the second power line and a ground signal is applied to the first power line, the second detector outputs a power detection signal to conduct the first switch. And a groundless virtual grounding method of connecting the first power line to the ground sensor.

According to another aspect of the present invention for achieving the above object, as to divide the first power line and the second power line for supplying commercial power into a signal line and a ground line, located to face the ground and virtual A ground sensor of a metal body connected to the ground terminal, one end of which is connected to the first power line and the second power line, and the other end of which is connected to the ground sensor, thereby detecting voltages of the first and second power lines. And a plurality of ground terminals are distributed by connecting a ground terminal block to a ground terminal of a virtual ground apparatus including a line detector electrically connecting a relatively low voltage power line and the ground sensor. A buried virtual grounding method is provided.

Here, it is possible to install the virtual grounding device in the distribution panel.

According to the present invention, the earth sensor and the grounding device and the construction method not embedded in the earth have the following effects.

(1) A common power line can be easily used as a good grounding line in any environment by easily distinguishing the grounding wire (N) out of two general power supply lines.

(2) By providing a grounding device that is not embedded in a more reliable ground, efficient grounding can be provided even in outdoor simple facilities or mobile equipment, which are difficult to ground.

(3) By incorporating a surge protection function inside the above-mentioned grounding device, it is possible to protect the brain surge easily and efficiently.

(4) By applying the method of the present invention, it is possible to reduce the earth construction cost and effort to be buried in the ground, and to provide a stable earthing method without the convenience of maintenance and secular variation.

1 is a view showing a grounding method of the general earth grounding method.
2 and 3 illustrate embodiments of a grounding apparatus that is not embedded in the ground according to the prior art.
4 illustrates a power system diagram including a virtual grounding device according to the present invention.
5 is a block diagram illustrating an internal configuration of a virtual grounding apparatus according to the basic embodiment of the present invention.
6 is a block diagram illustrating an internal configuration of a virtual grounding apparatus according to another embodiment of the present invention.
7 and 8 are detailed circuit diagrams of the most grounding device, showing the principle of detecting the polarity of the line.
9 illustrates an example of a ground distribution method using the virtual grounding apparatus of the present invention.
10 shows another example of the ground distribution method using the virtual grounding apparatus of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

4 illustrates a power system diagram including a virtual grounding apparatus according to the present invention, and FIG. 5 is a block diagram illustrating an internal configuration of the virtual grounding apparatus according to the basic embodiment of the present invention.

As shown in FIG. 4, the power system including the virtual grounding device according to the present invention includes a power supply terminal and a customer, and the customer includes a virtual grounding device 1 and an electrical and electronic device 2 including a distribution panel. .

The virtual ground device 1 includes a ground sensor 10 and a line detector 20.

The ground sensor 10 is a metal plate or a metal wire positioned to face the earth, and is provided such that capacitance is formed between the earth and the sensor, or optionally, the contact plate is formed between the earth and the sensor by contacting the metal plate or the metal wire to the earth, and the electrical and electronic It is connected to the virtual ground terminal VG of the device 2.

The line detector 20 has one end connected to each of the first power line and the second power line, and the other end connected to the ground sensor 10. The line detector 20 detects a voltage of the first and second power lines and has a relatively low voltage. It is to electrically connect the power line and the ground sensor 10. Even when the phase of the signal line of the power source and the ground line of the power source is changed by the line detector 20 like the mobile device, the connection between the power side ground and the virtual ground is always performed.

As shown in FIG. 5, the line detector 20 is configured to include first and second detectors 21 and 23 and first and second switches 22 and 24 in detail.

The first detector 21 is connected between the first power line and the ground sensor 10 and detects when power is supplied to the first power line and outputs a power detection signal to the second switch 24.

The second detector 23 is connected between the second power line and the ground sensor 10 and detects when power is supplied to the second power line and outputs a power detection signal to the first switch 22.

The first switch 22 is installed between the first power line and the ground sensor 10, and is connected when the power detection signal is input from the second detector 23 to connect the first power line and the ground sensor 10. The first power line, which is a ground line, is connected to the virtual ground terminal VG.

The second switch 24 is installed between the second power line and the ground sensor 10, and is connected when the power detection signal is input from the first detector 21 to connect the second power line and the ground sensor 10. The second power line, which is a ground line, is connected to the virtual ground terminal VG.

Detailed circuit configuration and operation principle of the virtual grounding device 1 will be described in detail with reference to FIGS. 7 and 8.

6 is a block diagram illustrating an internal configuration of a virtual grounding apparatus according to another embodiment of the present invention.

6 is basically the same as the basic embodiment of FIG. 5, but between the first power line and the second power line, between the first power line and the ground sensor 10, and the second power line and the ground sensor ( It is different that the surge protection elements Z1 to Z3 are provided between 10) to protect the circuit in case of lightning strike.

Referring to the protection and the equipotential bonding process according to the surge inflow, assuming that the first power line is the ground of the power terminal, the surge of the second power line is the first through the first surge protection element (Z1). The surge is released to the power supply line and the surge flowing from the virtual ground VG flows through the second surge protection element Z2 to the first power supply line and is released.

In addition, assuming that the second power line is the ground of the power supply terminal, the surge of the first power line is eliminated to the second power line through the first surge protection element Z1 and flows from the virtual ground VG. Flows through the third surge protection element Z3 to the second power line to be eliminated.

7 and 8 are detailed circuit diagrams of the most grounding device, showing the principle of detecting the polarity of the line.

The first detector 21 is a type in which two capacitors C11 and C12 are connected in series between the first power supply line and the ground sensor 10, and a capacitance formed between the ground and the electrode of the ground sensor 10. The Cap component is connected in series, and the component divided by the capacitor C12 is detected and supplied as a trigger signal of the second switch S21 between the second power line and the virtual ground VG.

In addition, the second detector 24 is a form in which two capacitors C21 and C22 are connected in series between the second power line and the ground sensor 10, and a capacitance formed between the ground and the electrodes of the ground sensor 10. The Cap component is connected in series and detects the component divided across the capacitor C22 to supply the first switch S11 between the first power supply line and the virtual ground VG as a trigger signal.

A charge / discharge loop is formed between the first power line and the ground through the C11-C12-Cap-ground, and the charge / discharge current will be detected as a voltage drop across C12 based on the virtual ground (VG).

The detected voltage triggers the gate of the switch S21 and is directly connected to the second power line electrically and physically through the switch S21.

At this time, based on the neutral multi-grounding scheme of the commercial power supply, if the first power supply line is in a live state, the second power supply line is grounded (N), and thus the virtual ground VG is connected to the KEPCO earth ground.

In addition, if the AC power line is in an active state, the second power line is configured to have a charge / discharge loop passing through the C21-C22-Cap-earth between the second power line and the earth, and the charge / discharge current is based on the virtual ground (VG). As a result, a voltage drop across C22 is detected.

The detected voltage triggers the gate of the switch S11 and is directly connected to the first power line electrically and physically through the switch S11.

At this time, if the second power line is in a live state based on the neutral multi-grounding method of the commercial power source, the first power line becomes ground (N), and thus, the virtual ground VG is connected to the earth ground of KEPCO.

Here, when one line is in a live state and detects a signal with a capacitor on the line side and triggers a switch on the other line side, the other line where no signal is detected is always connected to the ground (N) on the KEPCO side. Under normal circumstances, current does not flow even if trigger signal is supplied. However, when a short circuit occurs, the gate signal is always supplied, so as soon as a short circuit occurs, current flows to the ground to prevent danger.

Preferably, the first switch S11 and the second switch S21 may selectively include IGBTs, TRs, and FETs having bidirectional characteristics by combining a switch or a bridge diode rectifier such as a GCA device, a PNPN device, or a relay. There are features that can be.

Here, the GCA element is a gate control arrestor which is a well-known technique, and a detailed description of a known structure or function, such as an IGBT, TR, or FET, having a bidirectional characteristic in combination with a PNPN element and a relay or a rectifier, obscures the gist of the present invention. It is judged that the detailed description thereof can be omitted.

In addition, the gates of the first switch S11 and the second switch S21 may be provided by combining or selectively adding a rectification, a delay, an amplification circuit, and a gate trigger circuit to the signals applied from the detectors 1 and 2. This is common knowledge of those skilled in the art, so a detailed description thereof will be omitted.

In the above, the case where the ground sensor 10 and the ground are spaced apart from each other using a capacitance Cap formed between the ground and the electrode of the ground sensor 10 is illustrated. In addition, the capacitance Cap is replaced with a resistance component or the ground sensor Even if (10) is in direct contact with the earth, the basic operation is the same. This is because the core of the present invention is in voltage distribution by two capacitors connected in series.

However, since the position of the mobile equipment is continuously variable, it is more preferable to use a capacitance Cap formed between the earth and the earth sensor 10 and spaced between the earth and the electrode of the earth sensor 10, and in particular, the mobile equipment is a vehicle. In the case of a metal, such as the bottom surface of the mobile equipment has the advantage that can function as a ground sensor.

In the above, the process of forming the capacitance between the ground sensor 10 and the ground in the encyclopedia of electrostatic induction phenomenon,

"When the charge is brought closer to a conductor or dielectric, electric charges are induced on the surface of the object under the influence of an electric field. It is also called electrostatic induction or electrostatic induction.

On the side near the charge, a different kind of charge appears on the opposite side, and on the other side the same charge appears. This phenomenon is used to make a detector to find out the state of charge or to make a Leiden bottle that stores electricity. Unless grounded or touching the ground, the object remains in its original electrical neutral state as a whole.

In electrostatic induction of a conductor, when a positively charged object approaches a conductor such as a metal, genes in the conductor receive attraction from the positive charge and move toward the mother body. As a result, negative charges are induced on the surface close to the charged body, and positive charges are induced on the opposite side. Approaching a negatively charged object will do the opposite. At this time, if you take the whole body away again, it will return to its original neutral state. This is because only the charge distribution is changed while the charge amount is preserved. Therefore, the magnitude of the positive and negative charges induced on both sides of the conductor is the same. ”

In addition, the capacitance between the two metal plates facing each other, the larger the area, the closer the distance, the capacitance increases, the smaller the area, the longer the distance, the smaller the capacitance is known theory, The present invention utilizes the capacitance between the earth sensor and the earth by replacing the electrostatic phenomenon between the two objects formed when the conductor or the earth is close to the process of forming the capacitance between the earth electrode and the earth.

9 illustrates an example of a ground distribution method using the virtual grounding apparatus of the present invention.

As shown in FIG. 9, a ground terminal box 50 electrically connected to the virtual grounding device 1 of the present invention is provided, and a plurality of distribution terminals 51 are provided in the ground terminal box 50 to distribute ground. You can do that. In addition, it is also possible to connect the ground to the telecommunication device 70 or to further distribute the ground by further comprising a ground distribution board 60 in the telecommunication device 70.

10 shows another example of the ground distribution method using the virtual grounding apparatus of the present invention.

As shown in FIG. 10, as another example for utilizing the virtual grounding apparatus 1, the ground terminal stage 90 is electrically connected by installing the virtual grounding apparatus 1 of the present invention in a distribution box 80. And a plurality of distribution terminals 91 in the ground terminal material 90 to distribute the ground.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: virtual grounding device 2: electrical and electronic equipment
10: ground sensor 20: line detector
21: first detector 22: first switch
23: second detector 24: second switch
30: Earth 50: Ground terminal box (ground terminal block)
60: ground distribution box 80: distribution box
90: ground terminal block

Claims (7)

A ground sensor for separating a first power line and a second power line for supplying commercial power into a signal line and a ground line, the ground sensor being positioned to face the ground and connected to a virtual ground terminal; And
One end is connected to each of the first power line and the second power line, and the other end is connected to the ground sensor. The power line and the ground sensor having a relatively low voltage are detected by detecting voltages of the first and second power lines. An earthless virtual grounding device comprising a line detector for electrically connecting the liver.
The method of claim 1,
The track detector is
A first detector connected between the first power line and the ground sensor and outputting a power detection signal;
A second detector connected between the second power line and the ground sensor and outputting a power detection signal;
A first switch disposed between the first power line and the ground sensor and conducting when a power detection signal is input from the second detector; And
And a second switch installed between the second power line and the ground sensor, wherein the second switch is turned on when a power detection signal is input from the first detector.
The method of claim 2,
And the first detector and the second detector are connected in series with the first and second capacitors to output detection signals at both ends of the second capacitor.
The method of claim 1,
A groundless virtual grounding device comprising a surge protection device between the first power line and the second power line, between the first power line and the ground sensor, and between the second power line and the ground sensor. .
A first detector and a first switch are installed between the first power line and the ground sensor, and a second detector and a second switch are installed between the second power line and the ground sensor.
When a power signal is applied to the first power line and a ground signal is applied to the second power line, the first detector outputs a power detection signal to conduct the second switch to connect the second power line to the ground sensor. Connect to,
When a power signal is applied to the second power line and a ground signal is applied to the first power line, the second detector outputs a power detection signal to conduct the first switch to connect the first power line to the ground sensor. An earthless virtual grounding method, characterized in that connected to the.
The first power line for supplying commercial power and the second power line for separating the signal line and the ground line, the ground sensor of the metal body which is located facing the ground and connected to the virtual ground terminal, and one end of the first power line Connected to the line and the second power line, respectively, and the other end is connected to the ground sensor, and detects the voltage of the first and second power line to electrically connect the power line with a relatively low voltage and the ground sensor A groundless virtual grounding method, comprising: forming a plurality of ground terminals by connecting a ground terminal block to a ground terminal of a virtual ground apparatus including a line detector.
The method according to claim 6,
The virtual grounding method of the buried earthless method, characterized in that the virtual grounding device is installed in the distribution panel or optionally further comprises a ground terminal block in the telecommunication device.

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