KR102085221B1 - Ground Fault Detection and Ground Impedance Automatic Matching Apparatus - Google Patents

Abstract

Disclosed is a device for detecting a ground fault and automatically matching a ground impedance, capable of preventing damage to equipment and noise caused by a potential difference. The device for detecting a ground fault and automatically matching a ground impedance comprises: an N,P power line connected to an N,P power source terminal and an N,P ground line connected to an N,P ground terminal; a first voltage measuring unit; a second voltage measuring unit; a potential difference measuring unit configured to measure a potential difference between the first voltage measuring unit and the second voltage measuring unit; a control unit; and an impedance matching unit.

Description

Ground fault detection and ground impedance automatic matching device {Ground Fault Detection and Ground Impedance Automatic Matching Apparatus}

The present invention constantly checks whether or not grounded or poor grounding when supplying power to the equipment to check the continuity of the ground, if the ground is poor or not grounded by correcting the potential difference of the power supplied to the equipment through impedance matching The present invention relates to a grounding disconnection detection and grounding impedance automatic matching device which prevents equipment damage and noise generation due to potential difference.

Electricity is an indispensable resource in modern life, but it can also cause fatal injuries, such as loss of life when an electric shock occurs. In addition, when operating electrical equipment or performing maintenance on industrial sites, discontinuity occurs between the power line of the electric machine equipment and the ground, which may cause an electric shock disaster or burns. Potential differences occur, causing equipment damage. In particular, when checking and repairing in high voltage transmission line or live state of equipment, discontinuity with ground in electromechanical equipment may cause fatal accidents and equipment failure.

According to the recent analysis of electric shock disaster, more than 60% of accidents occur in small-scale construction industry, and electric shock accidents due to poor insulation of electric equipment occupy about 30%. In particular, a lot of electric shock death and scattering / contact injury caused by mobile electrical equipment in the construction site. Accordingly, there is a need for measures to reduce the electrical risk in mobile electric machines / mechanisms.

In order to prevent such an electric shock accident, it is essential to install a grounding facility and an earth leakage breaker. In the case of grounding, check whether the grounding state is always maintained continuously. In addition, when a grounding type and a non-grounding type are mixed, a blind spot for preventing an electric shock such as an inoperability of an earth leakage breaker may occur.

As part of a scheme for preventing such an electric shock disaster, various devices for checking the continuity of the ground wire have been used. A surge protector (see Patent Document 1) capable of judging the ground state, a device for indicating a resistive ground state, a device for detecting a ground fault of an electronic product (see Patent Document 3), a ground check outlet for absorbing or removing electromagnetic waves (Refer patent document 4), etc. are shown.

In addition, conventional ground continuity confirmation devices include an ohmmeter, a multimeter, a plug-type device with a confirmation lamp, and a device for checking continuity by grounding mobile equipment. Such a ground continuity checking device is usefully used to check the ground continuity state at the time of electric work, maintenance, and inspection of an industrial site and a construction site.

However, these conventional devices have a problem that the price is high and the instrument structure is complicated.

In addition, the plug-type identification device has a disadvantage in that it cannot be used during the operation of the equipment and thus must be used while the operation of the equipment is stopped.

In addition, the device for confirming the grounding continuity for electrostatic discharge in a mobile facility is not only expensive, but also has a problem in that it is large and inconvenient to carry.

Patent Document 1: Korean Patent Publication No. 10-0941962 Patent Document 2: Korean Patent Publication No. 10-2003-0083472 Patent Document 3: Korean Patent Publication No. 10-0689032 Patent Document 4: Korean Patent Publication No. 10-0407770

The present invention is to solve the above problems, an object of the present invention is to constantly check whether the ground or the poor ground when supplying power to the equipment to check the continuity of the ground, if the ground is poor or not grounded The purpose of the present invention is to provide a grounding disconnection detection and grounding impedance automatic matching device to prevent equipment damage and noise caused by the potential difference by correcting the potential difference of the power supplied to the equipment through impedance matching.

The technical problem to be achieved in the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

According to the above object, N, P power line connected to the N, P power terminal of the outlet or power distribution device and N, P ground line connected to the N, P ground terminal; A first voltage measurement unit connected to the N power line and the N ground line to constantly measure a voltage; A second voltage measurement unit connected to the P power line and the P ground line to constantly measure a voltage; A potential difference measuring unit measuring a potential difference between the first voltage measuring unit and the second voltage measuring unit; A control unit for comparing the potential difference value transmitted from the potential difference measuring unit with a reference value and transmitting a control command according to the comparison result; And an impedance matching unit for correcting the potential difference value to a reference value or less by impedance matching by the control signal of the controller when the potential difference value is larger than the reference value. The outlet on the N, P power line and the N, P ground line And a power input unit provided between the first and second voltage measuring units, wherein one side of the main body of the power input unit is provided with a plug connected to an outlet, and the other side of the main body includes the N, P power lines and N, A connection terminal connected to the P ground line is provided, and a power supply unit for supplying power to a specific device is provided on the other side, and the impedance matching unit receives a control command transmitted from the control unit, and the receiving unit An operation unit which performs an impedance matching operation according to the received control signal, and only when a control signal is received in the receiver unit Provides a ground-line detection and automatic grounding impedance matching device is configured to drive unit for operating the control panel.

Preferably, when the potential difference value is greater than the reference value, further comprises a warning means operated according to the control command of the control unit, the warning means may be configured as a buzzer or a warning light.

Preferably, the apparatus may further include an operation checking lamp for confirming whether the control unit is operating.

According to the present invention, when supplying power to the equipment, whether or not grounded at all times to detect the ground fault by checking the continuity of the ground, if not grounded by correcting the potential difference of the power supplied to the equipment through impedance matching virtual ground By doing so, it is possible to prevent equipment damage and noise caused by the potential difference.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a block diagram of a ground disconnection detection and ground impedance automatic matching device according to the present invention;
2 is an operation flowchart of the ground disconnection detection and the ground impedance automatic matching device according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment according to the present invention. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The same reference numerals are used for parts having similar configurations and operations throughout the specification. And the drawings attached to the present invention is for convenience of description, the shape and relative measures may be exaggerated or omitted.

In describing the embodiments in detail, overlapping descriptions or descriptions of obvious technology in the art are omitted. In addition, in the following description, when a portion "includes" another component, it means that it can further include components other than the described components unless otherwise stated.

In addition, the terms "~", "~", "~ module" described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. Can be. In addition, when a part is electrically connected to another part, this includes not only the case where it is directly connected, but also the case where it is connected through the other structure in the middle.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.

1 is a block diagram of a ground disconnection detection and ground impedance automatic matching device according to the present invention. As shown in FIG. 1, the N, P power lines 11 and 12, the N and P ground lines 13 and 14, the first voltage measuring unit 21, the second voltage measuring unit 22, and the potential difference measuring unit 30, the controller 40 and the ground impedance matching unit 50 may be included.

The N and P power lines 11 and 12 are respectively connected to the N and P power terminals 2 and 3, which are AC power terminals (eg, AC 200 V) of a power supply device (eg, an outlet: 1) or a power distribution device. . The N and P ground lines 13 and 14 are connected to the N and P ground terminals 4 and 5 of the power supply 1 or the power distribution device, respectively. Here, the N and P power terminals 2 and 3 are two lines to which AC power is input, and the N and P ground lines 4 and 5 are grounds for grounding.

Preferably, the end portions of the N, P power lines 11 and 12 and the N, P ground lines 13 and 14 are externally configured in the form of plugs, and can be connected to the outlet 1 to which AC power is supplied. AC power is supplied from the outlet. That is, input pins and ground pins are provided at the ends of the N, P power lines 11 and 12 and the N and P ground lines 13 and 14, and the corresponding input terminal and the ground terminal are connected to the power supply terminal and the ground of the outlet 1. Can be connected to the terminal. As a result, the N and P power lines 11 and 12 can be supplied with power at all times and can be easily detached from the outlet 1 as necessary.

Meanwhile, a power input unit 60 is provided between the outlet 1 on the N and P power lines 11 and 12 and the N and P ground lines 13 and 14 and the first and second voltage measuring units 21 and 22. It can be further configured. One side of the main body of the power input unit 60 may be provided with a plug that is connected to the outlet 1 as described above, the other side of the main body of the N, P power line (11, 12) and the N, P ground line Connection terminals 13 and 14 may be provided, and on one side thereof, a power supply unit for supplying power to the equipment may be provided.

Therefore, the power input unit 60 serves as a connector for connecting the outlet 1 and the N, P power lines (11, 12) and the N, P ground lines (13, 14) and serves to supply power to the equipment. The reason why this is necessary is to form a plug at the ends of the N, P power lines 11 and 12 and the N and P ground lines 13 and 14, and supply power to the equipment when it is directly connected to the outlet 1. Because it is difficult to do.

The first voltage measuring unit 21 is connected to the N power line 11 and the N ground line 13 to measure the voltage thereof. Conventionally, two probe rods are connected to N outlets using portable voltage measuring equipment. After connecting to the power supply terminal 2 and the N ground terminal 4, the measurement was performed using the measured value output to the meter reading window. However, the first voltage measuring unit 21 of the present embodiment has the N power line 11 and Since it is always connected to the N ground line 13, the voltage can be continuously measured in real time.

The second voltage measuring unit 22 is connected to the P power supply line 12 and the P ground line 14 to measure the voltage thereof, and the second voltage measuring unit 22 of the present embodiment is the first voltage. As described in the measuring unit 21, the P power supply line 12 and the P ground line 14 are constantly connected to measure voltage continuously in real time.

The potential difference measurer 30 measures the potential difference between the first voltage measurer 21 and the second voltage measurer 22, and is electrically connected to the first and second voltage measurers 21 and 22. The voltage difference measured from each of them is received to calculate the potential difference between the two data, and the calculated potential difference value is transmitted to the controller.

The control unit 40 compares the potential difference value transmitted from the potential difference measuring unit 30 with a reference value (of potential difference) previously stored and transmits a control command according to the result. That is, when the potential difference value is larger than the reference value, it is either ungrounded or poorly grounded. In this case, a potential difference occurs in the power supply to the equipment, causing damage to the equipment. Noise is generated in the signal.

 Therefore, in order to prevent this, the control unit 40 sends a control command to operate the impedance matching unit 50 when the potential difference value exceeds the reference value so that the potential difference is corrected.

In addition, the controller 40 may operate the buzzer 70 or the warning lamp as a warning means for warning that the potential difference is abnormal. Accordingly, it also serves to enable the worker to recognize that the ground state is abnormal.

On the other hand, the control unit 40 is installed inside the housing, the operator can not know whether it operates normally, so it is preferable that the operation check lamp 80 is installed in a position where the operator can see.

Impedance matching unit 50 is a potential difference correction means for automatically correcting the potential difference value below the reference value by impedance matching by the control signal of the control unit 40, the N power supply line 11, N ground line 13, By connecting the P power supply line 12 and the P ground line 14 to correct the potential difference, it is possible to prevent equipment damage and noise.

The impedance matching unit 50 may include a receiving unit 51 receiving a control command transmitted from the control unit 40 and an operation unit 52 performing an impedance matching operation according to the control signal received by the receiving unit 51. And a driving unit 53 for operating the operation unit 52 only when a control signal is received by the receiving unit 51.

Here, the operation unit 52 matches an input impedance and an output impedance, stores an input noise value and an output noise value in a state where the impedance is matched, calculates a cutoff ratio, and stores the value. The largest value among the stored blocking rate values may be calculated, and the input impedance and the output impedance may be matched according to the calculated blocking rate.

2 is an operation flowchart of the ground disconnection detection and the ground impedance automatic matching device according to the present invention.

According to FIG. 2, the control logic of the ground disconnection detection and ground impedance automatic matching device according to the present invention includes an N power line 11, an N ground line 13, a P power line 12 and a power supply 1. After the P ground line 14 is connected, the potential difference between the N power line 11 and the N ground line 13 and the P power line 12 and the P ground line 14 is measured.

If the measured potential difference is smaller than the reference value, the ground is normally grounded. Then, the potential difference of the power supply 1 is continuously measured. If the potential difference is larger than the reference value, the switch is turned on to correct the potential difference within the reference value through impedance matching. This normalizes the potential difference.

Although the above-described embodiment has been described with respect to the preferred embodiment of the present invention, it is noted that the present invention is not limited thereto and may be implemented in various forms without departing from the technical spirit of the present invention.

11: N power line 12: P power line
13: N ground line 14: P ground line
21: first voltage measuring unit 22: second voltage measuring unit
30: potential difference measuring unit 40: control unit
50: ground impedance matching unit 60: power input unit

Claims (3)

N, P power line connected to the N, P power terminal of the outlet or power distribution device and N, P ground line connected to the N, P ground terminal;
A first voltage measurement unit connected to the N power line and the N ground line to constantly measure a voltage;
A second voltage measurement unit connected to the P power line and the P ground line to constantly measure a voltage;
A potential difference measuring unit measuring a potential difference between the first voltage measuring unit and the second voltage measuring unit;
A control unit for comparing the potential difference value transmitted from the potential difference measuring unit with a reference value and transmitting a control command according to the comparison result; And
And an impedance matching unit for correcting the potential difference value to a reference value or less by impedance matching by the control signal of the controller when the potential difference value is larger than a reference value.
Further comprising a power input unit provided between the outlet on the N, P power line and the N, P ground line and the first and second voltage measuring units, the main body side of the power input unit is provided with a plug connected to the outlet, The other side of the main body is provided with a connection terminal connected to the N, P power line and the N, P ground line, the other side is provided with a power supply for supplying power to a specific equipment,
The impedance matching unit receives a control command transmitted from the control unit, an operating unit performing an impedance matching operation according to the control signal received from the receiving unit, and operates the operating unit only when a control signal is received in the receiving unit. Further comprising a drive unit for configuring, the ground disconnection detection and ground impedance automatic matching device.
The method according to claim 1,
If the potential difference value is greater than the reference value, further comprising a warning means for operating in accordance with the control command of the control unit, wherein the warning means ground disconnection detection and ground impedance automatic matching device, characterized in that the buzzer or beacon.
The method according to claim 1,
Ground disconnection detection and ground impedance automatic matching device further comprises an operation check lamp for confirming the operation of the control unit.

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