KR20090012248U - Portable leaking voltage detector - Google Patents

Abstract

A portable leakage voltage detector is provided. According to an embodiment of the present invention, a portable leakage voltage detector includes: a body part including a display part and an operation button for inserting a detection circuit thereinto indicate whether a leakage voltage is detected outside; A contact portion connected to one end of the body portion to detect a leakage voltage; And a handle portion which is connected to the other end of the body portion and can be gripped by the user, and the contact portion is formed of a rotating cylindrical structure which is rotatable forward.

Description

Portable Leakage Voltage Detectors {PORTABLE LEAKING VOLTAGE DETECTOR}

The present invention relates to a portable leakage voltage detector. Especially, it is easy to carry and can easily detect the leakage voltage where the occurrence of leakage voltage is suspected, thus preventing the risk of electric shock that may occur from a short circuit and reducing power loss. The present invention relates to a leakage voltage detector.

When a short circuit breakdown occurs in the underground low voltage distribution line that supplies power to customers such as homes or factories, the overcurrent breaker cuts off the circuit to prevent the danger that may occur by stopping the power supply.

However, when a ground fault occurs, the power supply will continue without breaking or alarming the converter. Therefore, there is a possibility of electric shock accident and power loss.

FIG. 1A is a diagram illustrating an example of a leakage current flowing along a manhole due to damage of the underground low voltage distribution line, and FIG. 1B is a diagram illustrating a potential distribution line of leakage voltage due to damage of the underground low voltage distribution line.

Referring to FIGS. 1A and 1B, a part of current is leaked from the damage point P of the ground-low voltage distribution line L and flows to the ground surface along the manhole M as indicated by the ground fault path Pa. As a result, the potential distribution line VL as shown in FIG. 1B is formed, thereby causing a risk of electric shock and a power loss.

As a solution to this problem, the manholes, handholes, and junction boxes of low-voltage underground cables, in which distribution lines are buried, are checked for leakage at regular intervals (usually twice a year). The short-circuit check is performed by installing aluminum foil on the water-sprayed connection and measuring leakage current and voltage.

However, the existing method of checking the current leakage is performed twice a year, so if the current leakage state caused by the ground fault of the low voltage power line continues for a long time (6 months), it cannot be detected. Power loss also occurs largely.

The present invention is to solve the problems present in the conventional method for checking whether the earth leakage is one aspect of the present invention is easy to carry and therefore anytime, anywhere, in particular, in the manhole, handhole, and underground junction box, The present invention provides a portable leakage voltage detector capable of immediately detecting a leakage voltage occurring on the earth's surface due to a short circuit from the underground low voltage distribution line.

According to an embodiment of the present invention, a portable leakage voltage detector is provided, wherein the leakage voltage detector includes: a body part including a display part and an operation button for detecting whether the detection circuit is inserted therein and whether the leakage voltage is detected outside; A contact part connected to one end of the body part to detect a leakage voltage; And a handle part connected to the other end of the body part and gripped by a user, wherein the contact part is formed of a rotating cylindrical structure which is rotatable forward.

The leakage voltage detector may further include an insulation rod between the body portion and the handle portion, and the insulation rod may be formed to be stretchable.

The insulating rod may be implemented in a telescopic form.

The contact portion may be made of a conductive material.

The display unit may include at least one of a light emitting lamp, a speaker, and a monitor.

The detection circuit may include a sensing unit for sensing a microcurrent conducted from the contact unit and transferring the microcurrent as an electrical signal to an amplifier unit, the amplifying unit for amplifying an electrical signal transmitted from the sensing unit and transferring it to a signal output unit; And a control unit for controlling the operation of the signal output unit driving the display unit according to the electric signal transmitted from the amplification unit, and the sensing unit, the amplifying unit, and the signal output unit.

The detection circuit may further include a circuit protection unit between the detection unit and the amplification unit to protect the amplification unit from a surge voltage.

The present invention provides a portable leakage voltage detector that is easy to carry, so that the leakage voltage can be easily detected where a leakage voltage is suspected. Therefore, it is possible to prevent a risk of electric shock that may occur from a short circuit and to reduce power loss. .

Hereinafter, the same reference numerals will be described in detail with reference to the accompanying drawings, with reference to the same components preferred embodiments of the present invention. The terms or words used in the specification and claims are not to be construed as being limited to conventional or dictionary meanings, but should be construed as meanings and concepts consistent with technical matters of the present invention.

The embodiments described in the present specification and the configuration shown in the drawings are preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents and modifications that may be substituted for them at the time of the present application are provided. There may be.

Figure 2a is a view showing the top surface of the leakage voltage detector according to an embodiment of the present invention, Figure 2b is a side view of the cylindrical detector-type leakage voltage detector shown in Figure 2a, and Figure 2c is a cylindrical detection shown in Figure 2a The figure which shows the top surface of a female leakage voltage detector, and is a figure which shows the state in which the insulating rod is extended.

2A, 2B, and 2C, the leakage voltage detector 1 is formed in a rod shape that is vertically long for easy portability.

The leakage voltage detector 1 includes a body portion 10, a contact portion 20, and a handle portion 30.

The light emitting lamp 11, the speaker 12, the button 13, and the battery inserting portion 14 are disposed at the top of the body portion 10 in order from left to right in FIG. 2A. The arrangement order is illustrative and not limited thereto.

The light emitting lamp 11 shows the output signal as light from the signal output section to be described later, and the speaker 12 shows the sound. As the light emitting lamp 11, a lamp using a filament lamp or other LEDs may be employed.

The button 13 turns on / off the detection operation of the leak voltage detector. The button 13 may use any one of but not limited to a pushbutton, a slide button, a touch button, and a toggle switch.

The battery inserting portion 14 inserts a battery or a battery serving as a power source of the leakage voltage detector 1.

Inside the body portion 10, a detection circuit as shown in Fig. 3 is incorporated. The detection circuit will be described later with reference to FIG. 3.

An insulating rod 15 as shown in FIG. 2C may be connected between the body portion 10 and the handle portion 30. The insulating rod 15 insulates between the handle portion 30 and the body portion 10 to prevent an electric shock that may occur to the user when detecting the leakage voltage.

Insulating rod 15 is configured in a telescopic form, such as a retractable antenna. Therefore, when carrying, it can be reduced for ease of carrying and when the leakage voltage is detected, the length can be extended for ease of detection.

The handle part 30 is connected to one end of the body part 10 and is a part held by a user who detects a leakage voltage. The outer surface of the handle part 30 may be roughened or coated with a material having high friction to prevent slippage. The handle part 30 may be made of an insulating material to prevent an electric shock from a current that may flow along the surface of the leakage voltage detector 1 when detecting the leakage voltage.

The contact portion 20 is connected to the other end of the body portion 10 to detect a leakage current. The contact portion 20 may be formed of a conductive material, for example, a conductive metal so as to easily detect the leakage current. In addition, the contact portion 20 may be treated such that the leakage resistance can easily flow to the contact portion 20, that is, the outer surface of the contact resistance is reduced to increase the conductivity.

In addition, the contact portion 20 has a large contact area and a front to allow the user, the earth, and the leakage voltage detector 1 to form a complete closed circuit when the ground is contacted for detection, that is, for smooth contact between the contact portion 20 and the ground. It can be formed into a rotating cylindrical structure that can be rotated.

The sensing unit to be described later is connected inside the contact unit 20. The sensing unit will be described later with reference to FIG. 3.

3 is a block diagram of a detection circuit mounted inside a leakage voltage detector according to an embodiment of the present invention.

Referring to FIG. 3, the detection circuit 2 includes a detector 21, an amplifier 22, a signal output unit 23, a power supply unit 24, and a controller 25.

The sensing unit 21 senses a microcurrent that is conducted from the contact unit 20 and transmits it to the amplifier 22 as an electric signal.

The amplifier 22 amplifies the electric signal transmitted from the detector 21. In general, since the microcurrent flowing into the contact portion 20 is very small in size, the leakage voltage detector 1 may determine that there is no microcurrent. Therefore, if the magnitude of the microcurrent increases rapidly, there is a risk of electric shock. Therefore, even a minute microcurrent can be detected to prevent a risk of electric shock that may occur in the future.

Therefore, the amplifier 22 amplifies an electric signal from the detector 21 derived from the microcurrent and transmits it to the signal output unit 23.

The signal output unit 23 receives the electric signal amplified by the amplifier 22 and drives the light emitting lamp 11 or the speaker 12 under the control of the controller 25. The signal output unit 23 may drive a (not shown) monitor unit that can indicate the presence or absence of the microcurrent or the magnitude of the microcurrent. The monitor unit may display the presence or absence of the microcurrent or the magnitude of the microcurrent, as well as the operating state of the leakage voltage detector 1, the remaining power of the power supply unit 24, and the like.

The electrical signal transmitted to the light emitting lamp 11 is converted into light so that the user can know whether the leakage voltage is detected by the light emission.

The electrical signal transmitted to the speaker 11 is converted into sound so that the user can know whether the leakage voltage is detected by the generation of the sound.

The control unit 25 controls the other components of the detection circuit 2 as a whole. For example, the controller 25 causes the sensing unit 21 to enter a sensing mode that enables the sensing unit 21 to detect the microcurrent when the button 13 is pressed. In the sensing mode, when a microcurrent flows from the contact unit 20 and passes through the sensing unit 21 and enters the amplifying unit 22 as an electric signal, the control unit 25 causes the signal output unit 23 to receive an electrical signal or light. The amplifier 22 amplifies the electric signal to the extent that it can instruct the generation of the leakage voltage by sound.

The control unit 25 may cause the amplified electric signal to be transmitted to the signal output unit 23 so that the signal output unit 23 instructs generation of a leakage voltage, for example, as light or sound.

The controller 25 may drive the signal output unit 23 only when the electric signal output from the amplifier 22 is greater than or equal to a predetermined size. This makes it possible for the leakage voltage detector 1 not to confuse the microcurrent with other naturally occurring ground currents other than those caused by the microcurrent.

The power supply unit 24 supplies power to each component of the detection circuit 2. The power supply unit 24 may include a rechargeable battery or a disposable battery.

The detection circuit 2 may further comprise a circuit protection unit (not shown) between the sensing unit 21 and the amplifying unit 22. When the circuit protection unit is a surge current of a high voltage instead of a micro current, the surge current may prevent the amplification unit 22 from being destroyed by flowing to the amplification unit 22.

To this end, the controller 25 may cause the circuit protection unit to block current from flowing from the detector 21 to the amplifier 22 when the magnitude of the microcurrent sensed by the detector 21 is greater than or equal to a predetermined value.

In addition, the controller 25 does not drive the amplifier 22 when the magnitude of the microcurrent sensed by the detector 21 is within a predetermined value, and thus transmits the electrical signal to the signal output unit 23 without amplifying the electrical signal. The signal output unit 23 may be driven.

4 is a diagram illustrating an example of detecting a leakage voltage using a leakage voltage detector according to an embodiment of the present invention.

Referring to FIG. 4, the user grips the handle part 30 of the leakage voltage detector 1 and makes contact with the contact part 20 to be detected.

If the ground current (Ig) flows on the earth surface due to the leakage of the low voltage underground distribution line, the earth potential (Eo) occurs according to the earth resistance.

At this time, by the earth potential Eo between the user's foot and the contact portion 20 of the leakage voltage detector 1, the contact resistance Zo between the person and the earth, the earth contact resistance Zi between the detector 1, and the earth The microcurrent Io flows in the closed circuit formed by the resistor Zg.

The generated micro current Io flows to the sensing unit 21 along the contact unit 20. Since the micro-current is amplified from the sensing unit 21 to the amplifier 22 to drive the light emitting lamp 11 or the speaker 12 to detect the leakage voltage, the repeated description is omitted.

The technical spirit of the present invention has been described above with reference to the accompanying drawings, which describes exemplary embodiments of the present invention by way of example and does not limit the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

1A is a diagram showing an example of a leakage current flowing along a manhole due to damage of the ground low voltage distribution line, and FIG. 1B is a diagram showing a potential distribution line of leakage voltage according to damage of the ground low voltage distribution line;

2A illustrates a top surface of a leakage voltage detector according to an embodiment of the present invention;

FIG. 2B is a side view of the cylindrical detector type leakage voltage detector shown in FIG. 2A; FIG.

FIG. 2C is a view showing the top surface of the cylindrical detector-type leakage voltage detector shown in FIG. 2A, showing an insulated rod extending state; FIG.

3 is a block diagram of a detection circuit mounted inside a leakage voltage detector according to an embodiment of the present invention; And

4 is a diagram illustrating an example of detecting a leakage voltage by using a leakage voltage detector according to an embodiment of the present invention.

Claims (7)

As a portable leakage voltage detector, A body part including a display part and an operation button inserted therein to indicate whether a leakage voltage is detected outside; A contact part connected to one end of the body part to detect a leakage voltage; And A handle part connected to the other end of the body part and gripped by a user; The contact portion is a portable leakage voltage detector is formed of a rotating cylindrical structure rotatable forward. The portable leakage voltage detector of claim 1, further comprising an insulation rod between the body portion and the handle portion, wherein the insulation rod is formed to be stretchable. The portable leakage voltage detector of claim 2, wherein the insulation rod is implemented in a telescopic form. The portable leakage voltage detector of claim 1, wherein the contact portion is made of a conductive material. The portable leakage voltage detector of claim 1, wherein the display unit comprises at least one of a light emitting lamp, a speaker, and a monitor. The method of claim 1, wherein the detection circuit, A sensing unit which senses a microcurrent that is conducted from the contact unit and transfers the microcurrent as an electric signal to an amplifier unit, The amplifying unit which amplifies an electric signal transmitted from the sensing unit and transmits the amplified electric signal to a signal output unit; The signal output unit driving the display unit according to the electrical signal transmitted from the amplifying unit, and And a controller for controlling the operation of the detector, the amplifier, and the signal output unit. The portable leakage voltage detector of claim 6, further comprising a circuit protection unit configured to protect the amplification unit from a surge voltage between the sensing unit and the amplifying unit.

Images