WO2015111828A1 - Neutral grounding transformer, method therefor, and device for preventing electric shock in case of submersion by using same - Google Patents

Abstract

The present invention provides a neutral grounding transformer, which uses a neutral grounding method from a single-phase two-wire low-voltage power distribution method, a method therefor, and a device for preventing an electric shock in the case of submersion to prevent a breaking operation of an earth-leakage circuit breaker by allowing exposed terminals of an electrical device to be submerged nearly at the same time while using the neutral grounding transformer and the method therefor. To this end, the device for preventing an electric shock in the case of submersion, according to one embodiment of the present invention, can comprise: a transformer for supplying a voltage by using the neutral grounding method in the single-phase two-wire low-voltage power distribution method; an earth-leakage circuit breaker connected to power outputted from the transformer; and a breaking operation prevention unit for preventing a breaking operation of the earth-leakage circuit breaker by allowing an exposed plus terminal and an exposed minus terminal connected to the earth-leakage circuit breaker to be submerged within a preset time difference.

Description

Neutral grounding transformer and its method and device for preventing electric shock during flooding

Some embodiments of the present invention relate to a neutral grounded transformer and a method thereof, and an apparatus for preventing an electric shock during submersion using the same, and more particularly, to expose exposed terminals of an electrical device by using a neutral grounded method in a single-phase two-wire low voltage distribution system. And a method of neutral grounding transformer and method thereof to fundamentally prevent electric shock by greatly reducing the leakage current leaked to the outside from the terminals when the water is flooded, and using the neutral grounding transformer and the method The present invention relates to a device for preventing electric shock during flooding to allow the exposed terminals to be flooded at about the same time, thereby preventing the grounding circuit breaker from breaking.

In some embodiments of the invention below, the electrical device includes all electrical and electrical equipment, such as street lights, electric motors, high voltage transformers, traffic light controllers, and the like.

Generally, there are various low voltage distribution methods (hereinafter, referred to as 'first prior art') such as a single phase two wire low voltage distribution method, a single phase three wire low voltage distribution method, and a three phase four wire low voltage distribution method.

First, referring to FIG. 1, a single-phase two-wire low voltage distribution method is described. FIG. 1 is a view for explaining a conventional single-phase two-wire low voltage distribution method. As shown in FIG. 1, a positive terminal of an output side is illustrated. The 220V voltage is drawn between and and minus (-) terminals. At this time, the grounding method is connected with the ground side connected to the minus terminal.

Next, looking at the single-phase three-wire low-voltage distribution system, most of the conventional electrical devices used 110V. Then, as industrialization became active, the time to change to 220V came. Accordingly, there is a need for a low voltage power distribution system that can use a 110V electric device that is already in use and a newly generated 220V electric device in parallel, and the low voltage power distribution method that emerges is a single-phase three-wire low voltage power distribution system.

Next, looking at the three-phase four-wire low-voltage distribution system, as the industrialization is activated, the demand for three-phase electricity suitable for power use has increased, and accordingly, three-phase four-wire low voltage that can use three-phase electricity and single-phase electricity at the same time The power distribution system is also increased in proportion to it and is currently used in most low voltage power distribution systems.

2 is a view for explaining a conventional three-phase four-wire low-voltage distribution method, the R, S, T terminals shown in Figure 2 are used by connecting to a 380V three-phase motor, etc., N terminal and R, S, T Any one of the terminals is combined to draw 220V electricity.

By the way, in general, 220V electricity drawn from the single-phase two-wire low voltage distribution system and the single-phase three-wire low voltage distribution system and the three-phase four-wire low voltage distribution system seems to be the same when using electricity. This is much different. This will be described with reference to FIG. 3 using the single-phase three-wire low voltage distribution method and the three-phase four-wire low voltage distribution method as an example.

3 is a view showing an outlet in a conventional single-phase three-wire low voltage distribution system and a three-phase four-wire low voltage distribution system.

First, in the case of a three-phase four-wire low voltage power distribution type outlet, the voltage of terminal 1 and ground 3 is 220V, and the voltage of terminals 2 and 3 is 0V.

And in the case of single-phase three-wire low voltage power distribution type outlet, 110V comes out when the voltages of terminal 1 and ground 3 are measured, and 110V comes out when the voltages of terminals 2 and 3 are measured.

Through this, it can be seen that the ground (ground) voltage of the single-phase three-wire low voltage distribution system and the three-phase four-wire low voltage distribution system are different from each other.

Figure 4a is a view showing the result of measuring the leakage voltage during immersion in the conventional single-phase two-wire low-voltage distribution system, Figure 4b is a measurement of leakage current during immersion in the conventional single-phase two-wire low-voltage distribution system using an ammeter It is a figure which shows a state, FIG. 4C is an equivalent circuit diagram of FIG. 4B, FIG. 4D is a figure which shows instantaneous current flow in the equivalent circuit diagram of FIG. 4C.

As shown in Figure 4a, in the 220V power supply drawn from the conventional single-phase two-wire low-voltage distribution method, the two wires of the plus and minus terminals are extended and immersed in the plastic tank, and the distance of about 1m from the plus and minus lines in the water If we measure the voltage between water and ground terminal with voltmeter, the measured voltage is 110V which is the middle value of 220V. Therefore, when a person directly touches the water and the ground terminal at the same time, a lot of current flows in an instant and leads to electric shock. At this time, the amount of leakage current can be measured by connecting an ammeter between the water and the ground terminal as shown in Figure 4b.

Here, if the earth resistance value between the two grounds of FIG. 4B is about 3 kΩ, the equivalent circuit of FIG. 4B may be represented as shown in FIG. 4C.

At this time, referring to the instantaneous current flow in the equivalent circuit with reference to Figure 4d, after the current flows along the path a and path b by the electromotive force direction by the 220V voltage flows along the path c through the water. That is, in the flow of current, the force flows without canceling each other, so that the ammeter shows the value of the large current. Therefore, when a person is placed at the position of the ammeter (that is, when a person directly touches water and the ground terminal at the same time), a large amount of current flows in an instant and leads to electric shock.

In the above-described conventional single-phase two-wire low voltage distribution method and three-phase four-wire low voltage distribution method, the grounding method has a disadvantage in that the operation of the electric device is stopped when the earth leakage breaker operates normally when the electric device is flooded. Assuming that the earth leakage breaker does not operate when flooded, a large amount of current is leaked to the outside, so there is a great risk of electric shock.

On the other hand, Korean Patent Laid-Open Publication No. 10-2005-0037986 (hereinafter referred to as 'second prior art') discloses a leakage current flowing from a poorly charged portion (a portion through which current flows due to no coating) when an electric device is flooded during energization. The present invention discloses an immersion electric shock prevention device that absorbs and prevents a short circuit or an electric shock. The immersion electric shock prevention apparatus of the second prior art is illustrated in several embodiments, and the commonalities of the embodiments include a connection terminal block in which exposed connection terminals (single-phase connection terminal P, neutral terminal N, and ground terminal E) are disposed. Including a flat metal plate with a large enough area to cover all other devices such as breakers and ballasts, underneath the bottom of these terminal blocks, breakers, ballasts, etc., with electrical connection to the neutral point (N) or ground terminal (E). It is a configuration installed in the form of being deployed.

According to the description of the second prior art, even if the exposed connection terminals of the connection terminal block are submerged by this configuration, almost all of the current flowing through the uncharged part flows through the flat metal plate and the human body is in contact with water even if it is exposed. It is said that the strength of the electric current flowing through the wire is extremely weak to prevent an electric shock or an electric leakage.

However, according to the experiment and fabrication of the immersion electric shock prevention device having the same configuration as the second prior art, the second prior art has some fatal weaknesses.

First, in order to obtain a short circuit and electric shock prevention effect, a ground fault preventing metal plate must be connected to the neutral terminal of an AC power supply. According to the description of the second prior art, the plate-like metal plate should be connected to the neutral point terminal (N) or the ground terminal (E) of the AC power source in order to obtain a short-circuit prevention effect during immersion. One way to do this is to find out the first supply line connected to the neutral point terminal on the power supply side from two strands of single-phase (1P) AC power supply line when installing the connection terminal block, and connect it directly to the connection terminal to which the flat metal plate is connected. The second supply line is connected directly to the remaining connection terminals. By the way, this method is cumbersome to find the first supply line connected to the neutral terminal of the power supply side, if you find the wrong connection, you can not get the desired short circuit and electric shock protection effect, even when there is no need to supply power to the load There is a problem that the load is always connected to the power source, resulting in waste of power. In order to ensure that the load is connected to the power supply only when necessary, a plug and an outlet can be considered between the power supply and the terminal block. In this case, when the plate-type metal plate is electrically connected to the AC power source, it is connected through the terminal-> plug terminal-> outlet of the connecting terminal block. At this time, in order for the flat metal plate to be connected to the neutral terminal of the AC power supply, the plug terminal connected to the first connection terminal J1 of the connecting terminal block to which the flat metal plate is connected is completely connected to the outlet terminal connected to the neutral terminal of the AC power. It must be guaranteed. The plug has three plug terminals IN1 and IN2 and one ground terminal G electrically connected to three terminals of the connection terminal block. However, the two plug terminals IN1 and IN2 are identical in appearance. In addition, the two outlet terminals of the outlet to which the AC power is applied, that is, the first outlet terminal N connected to the neutral terminal of the AC power source and the second outlet terminal R connected to the single phase voltage terminal, are also identical in appearance. Therefore, in order for the first plug terminal IN1 to be connected to the first outlet terminal N when the user inserts the plug into the outlet, it is necessary to know which of the two plug terminals is the first plug terminal IN1. It is also necessary to know which of the two outlet terminals is the first outlet terminal (N). Ensuring these conditions is actually very difficult. Even if the user who knows the polarity of the plug and the outlet is not aware of the plug when plugging it into the outlet, he may make the mistake of not connecting the correct polarity. In order to prevent user error, it is also possible to put polarity markings on the plug terminal and the outlet terminal.However, there is a possibility that a user who does not know this may plug into the outlet and may inadvertently cause a mistake. At the same time, this method also has the disadvantage of not being complete.

In addition, although the second conventional technology explains that the same effect is obtained even when the earth leakage preventing metal plate is connected to the ground terminal (E), the experiment shows that the earth leakage preventing metal plate is not a 'neutral point terminal (N)' but a ground terminal ( When connected to E) there is a drawback that the desired short circuit and electric shock prevention effect cannot be obtained.

Second, the electric leakage preventing conductive metal plate proposed by the second prior art does not provide a function of preventing electric leakage and electric shock during immersion, as claimed in the second prior art. As a result of various tests, the cause of the leakage-preventing conductive metal plate was a 'flat' structure. According to the experiment, a configuration in which a large flat metal plate is disposed below the connection terminal block, as suggested by the second prior art, has a large leakage current within a few seconds to several tens of seconds after the connection terminal block is flooded, and the earth leakage breaker operates to load When the power supply to the power supply was cut off and immersed the hand in the flooded connection terminal, the shock of electric shock was felt. The reason for this is that the distance between the leakage preventing conductive metal plate and the second connection terminal connected to the single-phase voltage terminal is too long, and the body of the connection terminal block made of an insulating material is disposed therebetween, preventing current from flowing through the shortest path therebetween. Because of this, the resistance value between them is large, and accordingly, part of the current amount coming from the second connection terminal flows into the leakage preventing conductive metal plate, but it is estimated that the remaining amount of current is leaked to another place. The second prior art has proposed the size of an earth leakage preventing flat conductor plate as 50 × 30 cm when the voltage is 380 V. However, according to the test, a circuit breaker having a much larger size (for example, 60 × 60 cm) is used. Changes that take longer time fall, but eventually the circuit breaker tripped. Therefore, it was found that the problem could not be solved by increasing the size of the conductor plate. In practice, it is impossible to increase the size of the conductor plate indefinitely due to the space constraints on which the conductor plate can be installed. Therefore, the method of increasing the size of the flat conductor plate is a fundamental problem that cannot be solved.

Therefore, in the first conventional art as described above, when the ground fault circuit breaker normally operates when the electrical device is flooded, the operation of the electrical device is stopped. There is a problem in that the risk of electric shock accident due to leakage to the outside, and the second prior art as described above has a problem that does not provide a short circuit and an electric shock prevention effect, it is an object of the present invention to solve this problem.

Therefore, one embodiment of the present invention by using the neutral grounding method in the single-phase two-wire low-voltage distribution method, when the exposed terminals of the electric device is flooded, greatly reduces the leakage current leakage from the terminals to the outside to fundamentally prevent electric shock Provided are a neutral grounding transformer and a method thereof.

In addition, another embodiment of the present invention, while using the neutral grounded transformer and the method to expose the exposed terminals of the electrical device almost at the same time to prevent the operation of the earth leakage breaker to prevent the flooded electrical device to operate normally Provide a device to prevent electric shock during flooding.

In accordance with another aspect of the present invention, there is provided an apparatus for preventing electric shock during flooding, comprising: a transformer for supplying a voltage using a neutral grounding method in a single-phase two-wire low voltage distribution system; An earth leakage breaker connected to a power output from the transformer; And a blocking operation prevention unit for preventing the leakage operation of the ground fault circuit breaker by flooding the positive exposure terminal and the negative exposure terminal connected to the ground fault breaker within a predetermined time difference.

On the other hand, the device according to an embodiment of the present invention, in the transformer, it is possible to supply the voltage using the neutral point grounding method in the single-phase two-wire low-voltage distribution system.

In addition, the method according to an embodiment of the present invention, in the transformer transformation method, it is possible to supply the voltage using the neutral ground method in the single-phase two-wire low-voltage distribution system.

According to an embodiment of the present invention, by using the neutral grounding method in the single-phase two-wire low voltage distribution method, when the exposed terminals of the electric device are flooded, the leakage current leaked to the outside from the terminals is greatly reduced to fundamentally reduce the electric shock. There is an effect that can be prevented.

In addition, according to an embodiment of the present invention, the exposed terminals of the electrical device is flooded at about the same time to prevent the blocking operation of the earth leakage breaker, there is an effect that the flooded electrical device can operate normally.

1 is a view for explaining a conventional single-phase two-wire low-voltage distribution system,

2 is a view for explaining a conventional three-phase four-wire low-voltage distribution system,

3 is a view showing an outlet in the conventional single-phase three-wire low voltage distribution system and three-phase four-wire low voltage distribution system,

Figure 4a is a view showing the result of measuring the leakage voltage during immersion in the conventional single-phase two-wire low-voltage distribution system,

Figure 4b is a view showing a state of measuring the leakage current at the time of immersion by using an ammeter in a conventional single-phase two-wire low-voltage distribution system,

4C is an equivalent circuit diagram of FIG. 4B;

4d is a diagram showing instantaneous current flow in the equivalent circuit diagram of FIG. 4c;

5 is a diagram illustrating a neutral grounding transformer and a method thereof according to an embodiment of the present invention;

Figure 6a is a view showing the result of measuring the leakage voltage during immersion when the neutral point grounding method in the single-phase two-wire low-voltage distribution system according to an embodiment of the present invention,

6B is a view illustrating a state of measuring leakage current using an ammeter when the neutral point grounding method is used in the single-phase two-wire low voltage power distribution method according to an embodiment of the present invention;

6C is an equivalent circuit diagram of FIG. 6B;

6d is a diagram showing instantaneous current flow in the equivalent circuit diagram of FIG. 6c;

7 is a view for explaining a method of preventing a blocking operation of an earth leakage breaker according to another embodiment of the present invention;

8 is a view for explaining a method of preventing a blocking operation of an earth leakage breaker according to another embodiment of the present invention;

9A and 9B are diagrams for explaining another configuration of the positive exposure terminal 721 and the negative exposure terminal 722 according to the present invention.

In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention. .

In the specification, when a part is "connected" to another part, this includes not only a "directly connected" but also a "electrically connected" between other elements in between. In addition, when a part is said to "include" or "include" a certain component, it means that it may further include or have other components, without excluding other components, unless specifically stated otherwise. . In addition, the description of some components in the singular form throughout the specification, it is understood that the present invention is not limited thereto, and that the components may be formed in plural.

FIG. 5 is a diagram illustrating a neutral grounding transformer and a method thereof according to an embodiment of the present invention, and shows a neutral grounding method in a single-phase two-wire low voltage distribution system.

As shown in FIG. 5, one embodiment of the present invention includes a transformer 50 for supplying a voltage using a neutral grounding method in a single-phase two-wire low voltage distribution method. That is, one embodiment of the present invention, in the single-phase two-wire low-voltage distribution system consisting of a single-phase (1P) input side and two-wire output side, the neutral point 51 of the secondary winding (winding on the output side), the intermediate position of the secondary winding ) Is used to ground the neutral point grounding (52). Since other transformer technology is a known technology, it will not be described in detail here.

If neutral wire is added to the configuration method of Fig. 5, it is similar in appearance to the ground in the existing single-phase three-wire low-voltage distribution system, which is almost not newly established. However, the single-phase three-wire low-voltage distribution system focused on ensuring that the earth leakage breaker operates normally at both 110V and 220V voltages, but did not consider the leakage current during flooding of electrical devices. Up to now, the neutral grounding method in the single-phase two-wire low voltage distribution system as shown in FIG. 5 is not used.

As shown in FIG. 5, when the neutral grounding method in the single-phase two-wire low voltage distribution method is used, current flows between the positive terminals when the exposed terminals of the electric device are flooded, that is, negative (+) at the positive electrode terminal. -) The current flows to the electrode terminal and its forces cancel each other so that leakage current is hardly generated between the anode terminals and outside thereof (see FIGS. 6A to 6D described later). Of course, at this time, water existing between the anode terminals acts as a load to generate power consumption of about 30W.

Figure 6a is a view showing the result of measuring the leakage voltage when immersion in the case of using a neutral grounding method in the single-phase two-wire low-voltage distribution method according to an embodiment of the present invention, Figure 6b is a single phase according to an embodiment of the present invention FIG. 6C is an equivalent circuit diagram of FIG. 6B, and FIG. 6D is an equivalent circuit diagram of FIG. 6C. FIG. A diagram showing instantaneous current flow.

As shown in Fig. 6a, the two wires of the plus and minus terminals are extended and immersed in the plastic water tank in the 220V power supply drawn from the neutral grounding method in the single-phase two-wire low voltage power distribution method, and submerged in a plastic water tank and about 10 cm If the voltage between the water and ground terminals is measured with a voltmeter at a distance, the measured voltage will be less than 10V. More specifically, for example, a voltage of about 4V to about 10V is measured. Therefore, in general, it is known that an electric shock does not occur at a voltage of less than 30V, and even if the water and the ground terminal are directly contacted by hand at the same time, almost no current flows, so that an electric shock does not occur. As such, it can be confirmed by measuring the current leaking by connecting an ammeter between water and the ground terminal as shown in FIG. 6B that little current flows.

Here, if the earth resistance value between the two grounds of FIG. 6B is about 3 kΩ, the equivalent circuit of FIG. 6B may be represented as shown in FIG. 6C.

At this time, referring to the instantaneous current flow in the equivalent circuit with reference to Figure 6d, the current by the 220V voltage along the g path by the direction of the electromotive force by the 220V voltage (for example, the direction from top to bottom in Figure 6d). After flowing, it flows along path i through the water. In more detail, the voltage between the d terminal and the e terminal is 220V. As such, since there is a potential difference of 220V between the terminal d and the terminal e and a first closed circuit (g path-water lead-i path) using water in the plastic water tank is formed, a current of 220V voltage flows along the first closed circuit. do.

On the other hand, the voltage between the d terminal and the f terminal, and between the f terminal and the e terminal is 110V, respectively. As such, there is a potential difference of 110 V between terminal d and terminal f and terminal f and terminal e respectively, and the second closed circuit (g path-water lead-h path) and the third closed circuit (h path- Since the wire-i path of water is formed, it seems that current must flow along the second closed circuit and the third closed circuit, but the voltage between the terminal d and the terminal f and the terminal f and the terminal e is equal to 110V and the electromotive force direction Since the currents are opposite to each other and the current flows in opposite directions, almost no current flows. That is, since the upper 110V voltage and the lower 110V voltage are the same with respect to the neutral point 51, and the electromotive force directions of the two voltages are opposite to each other from the point of view of the ammeter, the current flows in the opposite directions so that the forces almost completely cancel each other. As a result, there is little potential difference and little current flows, and thus the value of the ammeter becomes almost " 0 ".

As a result, when the single-phase 220V of the neutral point grounding system in the single-phase two-wire low-voltage distribution system is used for electric devices with a high risk of flooding, the earth leakage breaker does not operate or the primary side of the earth leakage breaker is flooded. Even so, the risk of electric shock can be greatly reduced. In other words, by using the neutral grounding method in the single-phase two-wire low voltage power distribution method, when the exposed terminals of the electric device are flooded, there is almost no leakage current leakage from the terminals to the outside to fundamentally prevent electric shock. .

Next, referring to FIGS. 7 to 9, a method of preventing the blocking operation of the ground fault circuit breaker by flooding the exposed terminals of the electrical device at about the same time is as follows.

FIG. 7 is a view for explaining a method of preventing a blocking operation of an earth leakage breaker according to another exemplary embodiment of the present invention, and illustrates a case in which the blocking operation preventing unit 720 is integrally formed with the earth leakage breaker 710.

In general, the earth leakage breaker 710 is a wiring mechanism that automatically detects a state in which a voltage higher than a rated voltage comes in or a short circuit occurs in an electric device and automatically cuts off the electricity. In this case, the ground fault breaker 710 should perform a ground fault blocking operation within 0.03 seconds after the ground fault occurs in the case of a human body, and perform a ground fault breaking operation within 0.1 seconds after the ground fault occurs in the case of an industrial standard. Since the earth leakage breaker 710 is a known technology, it will not be described herein in detail. However, the ground fault breaker 710 is connected to the power output from the transformer 50 described above in FIG. 5, and supports a positive exposure terminal 721 connected to a plus terminal and a negative exposure terminal 722 connected to a negative terminal. Is basically done. In addition, the earth leakage breaker 710 may be a waterproof earth leakage breaker.

In this case, a short circuit may occur in a general state other than immersion and in a case in which the electric device is flooded. When a short circuit occurs in this manner, the ground fault breaker 710 operates normally to cut off the electricity supply, thereby stopping the operation of the electrical device in the rear stage.

However, as described above with reference to FIGS. 5 and 6A through 6D, by using the neutral grounding method in the single-phase two-wire low voltage distribution method, when exposed terminals of the electric device are flooded, they leak out from the terminals. If the short circuit current can be greatly reduced to prevent electric shock, in the event of a short circuit due to flooding, prevent the short circuit breaker from blocking the operation, so that the electrical devices (especially street lights, traffic signal controllers, outlets in underground facilities, etc.) It would be desirable to be able to operate.

Accordingly, another embodiment of the present invention prevents the exposed operation of the earth leakage breaker 710 by allowing the exposed plus and minus terminals of the electric device to be submerged within a predetermined time difference (for example, within 0.03 seconds), that is, almost simultaneously. It includes a blocking operation prevention unit 720 to.

In this case, the blocking operation prevention unit 720 may determine a predetermined separation distance between the positive exposure terminal 721 connected to the positive terminal of the earth leakage breaker 710 and the negative exposure terminal 722 connected to the negative terminal of the earth leakage breaker 710. For example, the lower end may be equilibrated with 7 mm to 8 mm, so that the positive exposure terminal 721 and the negative exposure terminal 722 are submerged within a predetermined time difference (for example, within 0.03 seconds). A current flows from the positive exposure terminal 721 to the negative exposure terminal 722 to prevent the circuit breaker 710 from breaking. That is, the blocking operation prevention unit 720 has two terminals such that the lower ends of the positive exposure terminal 721 and the negative exposure terminal 722 form an equilibrium (installed to equilibrate the lower end by using a water droplet level when installing). Is flooded at about the same time so that a current flows from the positive exposure terminal 721 to the negative exposure terminal 722, thereby preventing the ground fault breaker 710 from detecting a short circuit condition due to flooding, thereby preventing a blocking operation from occurring. .

The blocking operation prevention unit 720 further includes a support member 723 for supporting the positive exposure terminal 721 and the negative exposure terminal 722 to maintain the separation distance and the bottom balance. In this case, the support member 723 may be provided at any one of three positions (upper, middle, and lower ends) of the line from which the positive exposure terminal 721 and the negative exposure terminal 722 are drawn from the earth leakage breaker 710, In order to more reliably maintain the separation distance and the bottom equilibrium, it is preferable to be provided at a position (i.e., the bottom) on the side of the positive exposure terminal 721 and the negative exposure terminal 722, and more reliably the separation distance and the bottom balance. In order to maintain, it is more preferable that the positive exposure terminal 721 and the negative exposure terminal 722 are provided at all three positions (upper, middle, and lower) of the line from which the leakage circuit breaker 710 is drawn out, or the entire exposed line. . In addition, two supporting members 723 may be implemented to support the positive exposure terminal 721 and the negative exposure terminal 722, respectively.

[Revisions under Rule 91 23.03.2015]
In addition, the blocking operation preventing unit 720 further includes a protective case 724 for protecting the blocking operation preventing unit 720 from the flow rate of water. Generally, in case of immersion, the water may be filled without flowing water, but most of the immersion is caused by the flowing water. However, in the case of the blocking operation prevention unit 720, the separation distance between the positive exposure terminal 721 and the negative exposure terminal 722 and the bottom balance should be maintained. To this end, the blocking operation preventing unit 720 further includes a protective case 724 to prevent the blocking operation preventing unit 720 from flowing due to the flow rate of water.

[Revisions under Rule 91 23.03.2015]
At this time, the protective case 724 is to allow the water is obtained and discharged, and further includes a foreign matter inflow prevention unit 725 to prevent the foreign matter from entering. At this time, the foreign matter inflow prevention unit 725 may be specifically implemented as a foreign matter sieve, etc., it is preferably provided at the bottom of the protective case 724 to gradually fill the water in the protective case 724 when flooded. Here, the reason for preventing the inflow of foreign matter is to prevent the foreign matter from being inserted between the positive exposure terminal 721 and the negative exposure terminal 722 to prevent the blocking operation prevention unit 720 from malfunctioning.

[Revisions under Rule 91 23.03.2015]
The protective case 724 further includes an air exhaust unit 726 for exhausting the air therein when water is received. At this time, the air exhaust unit 726 may be provided at any position such as left and right or the center as long as the upper end of the protective case 724.

FIG. 8 is a view for explaining a method of preventing a blocking operation of an earth leakage breaker according to another exemplary embodiment of the present invention, and illustrates a case in which the blocking operation prevention unit 720 is implemented separately from the earth leakage breaker 710.

As shown in FIG. 8, each component of 710 to 726 is provided as described above in FIG. 7 and operates in the same manner, and thus will not be described herein.

However, the blocking operation preventing unit 720 further includes a fixing unit 810 for fixing the blocking operation preventing unit 720. In this case, the fixing unit 810 may fix the blocking operation preventing unit 720 to be horizontal while moving the bolt up and down, for example, in order to easily fix the blocking operation preventing unit 720 to be horizontal. .

9A and 9B are diagrams for explaining another configuration of the positive exposure terminal 721 and the negative exposure terminal 722 according to the present invention.

As described above, the lower ends of the positive exposure terminal 721 and the negative exposure terminal 722 are in equilibrium so that the positive exposure terminal 721 and the negative exposure terminal 722 are within a predetermined time difference (for example, 0.03 In order to be submerged in less than a second and to allow a good current to flow from the positive exposure terminal 721 to the negative exposure terminal 722, it is desirable to reduce the separation distance between the positive exposure terminal 721 and the negative exposure terminal 722. Do. However, if the separation distance between the positive exposure terminal 721 and the negative exposure terminal 722 is too short, there is a risk of malfunction due to foreign matters.

Accordingly, as shown in FIGS. 9A and 9B, the blocking operation prevention unit 720 is made of an insulating material (insulator) to determine a separation distance between the positive exposure terminal 721 and the negative exposure terminal 722. For example, 3 to 5mm) to further reduce the separation distance reduction portion (910, 920). In this case, the separation distance reduction parts 910 and 920 may be inserted (see FIG. 9A) at a portion of the positive exposure terminal 721 and the negative exposure terminal 722, or the positive exposure terminal 721 and the negative exposure terminal 722. It may be implemented in a form surrounding the position (see FIG. 9B), so that the current flows smoothly from the positive exposure terminal 721 to the negative exposure terminal 722 during immersion.

Here, the separation distance reducing unit 910 further performs a function of supporting the positive exposure terminal 721 and the negative exposure terminal 722 to maintain the separation distance and the bottom balance.

In the present invention, by reducing the separation distance as described above, it is easy to equilibrate the lower end of the positive exposure terminal 721 and the negative exposure terminal 722, so that the positive exposure terminal 721 and the negative exposure terminal 722 is It is easy to submerge within a predetermined time difference (for example, within 0.03 seconds), and it is possible not only to make the current flow better from the positive exposure terminal 721 to the negative exposure terminal 722, but also to the positive exposure terminal ( Water present between the 721 and the negative exposure terminal 722 may act as a load to reduce power consumption.

As described above, in the embodiment of the present invention, the exposed terminals of the electrical device are flooded at about the same time, thereby preventing the leakage circuit breaker from being blocked, thereby allowing the flooded electrical device to operate normally.

As described above, although the present invention has been described with reference to the limited embodiments and the drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains should understand the present invention. Various substitutions, modifications, and changes can be made without departing from the spirit. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

The present invention can be used in the field of preventing electric shock when flooded.

Claims (16)

In the electric shock prevention device when flooding, A transformer for supplying voltage using a neutral grounding method in a single-phase two-wire low voltage distribution system; An earth leakage breaker connected to a power output from the transformer; And Blocking operation prevention unit for preventing the leakage operation of the earth leakage breaker by flooding the positive and negative exposure terminals connected to the earth leakage breaker within a predetermined time difference Device that prevents electric shock during immersion comprising a. The method of claim 1, The blocking operation prevention unit, The positive exposure terminal connected to the positive terminal of the earth leakage breaker and the negative exposure terminal connected to the negative terminal of the earth leakage breaker are provided to have a lower end in equilibrium with a predetermined separation distance, so that the positive exposure terminal and the negative exposure terminal Is soaked within the predetermined time difference so that a current flows from the positive exposure terminal to the negative exposure terminal, thereby preventing the blocking operation of the earth leakage breaker. The method of claim 2, The blocking operation prevention unit, A support member for supporting the positive exposure terminal and the negative exposure terminal to maintain the separation distance and the bottom balance Device for preventing electric shock during immersion further comprising a. The method of claim 1, The blocking operation prevention unit, Protective case for protecting the blocking operation prevention part from the water flow rate Device for preventing electric shock during immersion further comprising a. The method of claim 4, wherein The protective case, Foreign material inflow prevention part to allow water to be obtained and discharged and to prevent foreign material from entering Device for preventing electric shock during immersion further comprising a. The method of claim 5, The foreign material inflow prevention unit, A device for preventing electric shock when submerged, provided at the bottom of the protective case to gradually fill the water. The method of claim 4, wherein The protective case, Air exhaust to allow air inside to escape when water is available Further comprising, an electric shock prevention device during immersion. The method of claim 1, Separating distance reducing part made of an insulating material to reduce the separation distance between the positive exposure terminal and the negative exposure terminal Device for preventing electric shock during immersion further comprising a. The method of claim 8, The separation distance reduction unit, A device for preventing electric shock during submersion, which supports the positive exposure terminal and the negative exposure terminal. The method of claim 1, The blocking operation prevention unit, Fixing part for fixing the blocking operation prevention part Device for preventing electric shock during immersion further comprising a. In the transformer, A transformer for supplying voltage using a neutral grounding method in a single-phase two-wire low voltage distribution system. The method of claim 11, The neutral grounding method, A transformer, connecting the neutral of the secondary winding on the output side to ground. The method of claim 11, A current flowing from the positive terminal to the negative terminal when the exposed terminals of the electrical device connected to the transformer are submerged, and the current flowing to the ground side by the neutral ground method is canceled to prevent the occurrence of leakage current. In the transformer transformation method, A transformation method for supplying a voltage using a neutral grounding method in a single-phase two-wire low voltage distribution system. The method of claim 14, The neutral grounding method, A transformation method, connecting the neutral point of the secondary winding on the output side with ground. The method of claim 14, And when the exposed terminals of the electrical device connected to the transformer are flooded, a current flows from the positive terminal to the negative terminal and the current flowing to the ground side by the neutral ground method is canceled to prevent the occurrence of leakage current.

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