Current Control-based Parallel Grounding Apparatus and Method

Abstract

The present invention relates to a parallel grounding device based on current control, comprising: a grounding wire (10) for transmitting electricity to the ground; a high-resistance grounding rod (12) connected to one end of the grounding wire (10); a relay unit (21) connected to the middle of the grounding wire (10); an overcurrent limiting inductor (14) connected to the relay unit (21); a low-resistance grounding rod (15) connected to the overcurrent limiting inductor (14); a current detection unit (25) for detecting the current flowing through the grounding wire (10); a grounding resistance reducing agent (16) placed around the low-resistance grounding rod (15) to reduce the grounding resistance; and a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26). We propose a current-control-based parallel grounding device characterized by a current-control-based low-resistance grounding rod line control unit (30) that includes a relay driving unit (23) for turning on the relay unit (21) based on the value of the current comparison unit (24).

Description

Technology Field

[0001] The present invention relates to a parallel grounding device and method that connects a high-resistance ground and a low-resistance ground in parallel and operates the connection of the low-resistance ground based on current control. Background Technology

[0003] A prior patent regarding a grounding device has been disclosed as follows.

[0004] In a related prior art document, Korean Registered Patent Publication No. 10-2621340, published on January 5, 2024 (hereinafter [Patent Document 1] Lee Ha-ram), a circuit breaker for electrical facilities equipped with a high-resistance grounding device and a circuit breaker was disclosed. [Patent Document 1] proposed a circuit breaker for electrical facilities equipped with a high-resistance grounding device and a circuit breaker, characterized by comprising a housing, a transformer device installed in a transformer receiving space provided inside the housing, a circuit breaker device provided in a circuit breaker receiving space provided inside the housing, and a high-resistance grounding device provided in the circuit breaker receiving space of the housing for detecting a ground fault of the transformer device.

[0007] In addition, Korean Registered Patent Publication No. 10-1506650, published on March 27, 2015 (hereinafter referred to as [Patent Document 2]), disclosed a multi-radial electrolyte grounding rod. [Patent Document 2] describes a main straight rod made of pure copper in the shape of a pipe with an electrolyte filled inside; first to fourth auxiliary corrugated copper bands arranged and coupled in all directions on the outer surface of the upper end of the main straight rod; first to fourth tip dispersion radiating needles spaced apart from the ends of the first to fourth auxiliary corrugated copper bands and arranged and coupled at regular intervals on the outer surface of the main straight rod (820); and first to fourth auxiliary straight rods alternately positioned between the first to fourth auxiliary corrugated copper bands, arranged and coupled on the outer surface of the main straight rod, and configured as an integral unit from the upper end to the lower end of the main straight rod. Fifth to eighth corrugated copper bands spaced apart from the ends of the first to fourth tip dispersion radiation needles and arranged and coupled in all directions to the outer surface of the middle portion of the main straight wire; fifth to eighth tip injection radiation needles spaced apart from the ends of the fifth to eighth corrugated copper bands and arranged and coupled at regular intervals to the outer surface of the main straight wire; first to fourth multi-pole corrugated copper bands spaced apart from the ends of the fifth to eighth tip injection radiation needles and arranged and coupled in all directions to the outer surface of the lower portion of the main straight wire, which are foamed or multi-pole treated to increase the surface area; fifth to eighth end radiation needles coupled to the ends of each of the first to fourth auxiliary straight wires; a cone-shaped pure copper rod radiation pole located at the end of the main straight wire; and a main straight wire tip dispersion radiation needle formed in the center of the pure copper rod radiation pole. A multi-radial electrolyte grounding rod comprising terminal 1 to terminal 4 radiating needles arranged and coupled in all directions on the above-mentioned pure copper rod radiating pole was proposed.

[0008] In addition, Korean Registered Patent Publication No. 10-2085352, published on March 5, 2020 (hereinafter referred to as [Patent Document 3]), disclosed a grounding facility for power distribution poles. [Patent Document 3] describes a guide part formed on a pole, into which a grounding wire inside the pole is inserted to be drawn out to the outside of the pole, and which guides the grounding wire to be positioned downward; a fixing plate disposed on the ground and provided as a disc, having a pole insertion hole formed in the center into which the pole is inserted, a seating groove formed at a predetermined distance from the pole insertion hole for the grounding wire to be seated, a plurality of grounding rod insertion holes formed radially based on the pole insertion hole, and a connecting groove formed between the seating groove and the grounding rod insertion holes to connect the seating groove and the grounding rod insertion holes; and a plurality of grounding rods inserted into the grounding rod insertion holes and inserted into the ground. A grounding facility for a power distribution pole is proposed, comprising: a connecting bar inserted into the above connecting groove, with one end contacting the grounding rod and the other end contacting and wrapping around a grounding wire seated in the above seating groove to connect the grounding rod and the grounding wire; a detachment prevention plate fastened to the above fixing plate from the upper side of the above fixing plate via a fixing bolt to prevent the grounding rod, connecting bar, and grounding wire from detaching; and a cover with a lower end inserted into the ground, covering the guide part, the above fixing plate, the grounding rod, the connecting bar, and the detachment prevention plate, with the upper end fixed to the above pole; wherein the grounding rod is connected to the grounding wire through the connecting bar to ground the grounding wire, and further comprises a cover support part consisting of a base plate positioned on the upper side of the detachment prevention plate, a support member extending from the upper side of the base plate, and a support plate extending from the upper side of the support member, with an inner surface contacting the above pole and an outer surface contacting the above cover to support the cover.

[0009] However, the above [Patent Documents 1] to [Patent Documents 3] used high-resistance grounding and low-resistance grounding in parallel, thereby using high-resistance grounding to limit ground fault current to a minimum, preventing power outages and enabling continuous maintenance, while having the problem that it is difficult to selectively apply low-resistance grounding in cases where extreme surge voltages, such as lightning strikes, occur. Prior art literature

[0011] Patent Document 1: Korean Registered Patent Publication No. 10-2621340, Publication Date 2024.01.05. Patent Document 2: Korean Registered Patent Publication No. 10-1506650, Publication Date 2015.03.27. Patent Document 3: Korean Registered Patent Publication No. 10-2085352, Publication Date 2020.03.05. The problem to be solved

[0012] The present invention features a current control-based parallel grounding device and method as technical features. Generally, a three-phase power supply system is an ungrounded delta ( ) type and grounding method Y( There is a ) type. Currently, most use a grounded Y-type to safely resolve ground fault currents. It adopts the ) type. However, Y( In the case of the ) type, delta( Compared to the ) type, it has the advantage of preventing abnormal potential, casualties, and fire hazards.

[0013] However, a multifaceted review is required regarding how to determine the resistance of the grounding device. Generally, when grounding with high resistance of several tens of ohms, ranging from 10 to 90 ohms, the grounding current flows at a rate of approximately 1 to 5 A. This has the advantage of minimizing ground fault currents, which account for about 90% of transmission and distribution faults in industrial facilities, chemical plants, and plant equipment, and enables continuous operation without power outages. However, it has the disadvantage of not being able to stably allow the grounding current to flow to the earth in response to excessive abnormal extra-high voltages, such as lightning strikes. Therefore, the present invention aims to solve these problems by introducing a current-controlled parallel grounding device and method. This allows for the use of high-resistance grounding of tens of ohms to respond to simple faults accounting for about 90% of power transmission and distribution failures, and low-resistance grounding in the range of 0.1 to 2 ohms to discharge currents of hundreds to thousands of amperes to the ground for excessive abnormal extra-high voltages such as lightning strikes, thereby providing a more reliable grounding device and method. means of solving the problem

[0015] In order to solve the problem, the present invention provides a parallel grounding device based on current control, comprising: a grounding wire (10) for transmitting electricity to the ground; a high-resistance grounding rod (12) connected to one end of the grounding wire (10); a relay unit (21) connected to the middle of the grounding wire (10); an overcurrent limiting inductor (14) connected to the relay unit (21); a low-resistance grounding rod (15) connected to the overcurrent limiting inductor (14); a current detection unit (25) for detecting the current flowing through the grounding wire (10); a grounding resistance reducing agent (16) placed around the low-resistance grounding rod (15) to reduce the grounding resistance; and a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26). A current control-based parallel grounding device and grounding method are provided as a means of solving the problem, characterized by a current control-based low-resistance grounding rod line control unit (30) including a relay driving unit (23) for turning on the relay unit (21) based on the value of the current comparison unit (24). Effects of the invention

[0017] As an enhanced effect of the present invention, first, high-resistance grounding of several tens of ohms is used to respond to simple faults accounting for about 90% of power transmission and distribution faults; second, a control unit is provided to use low-resistance grounding for excessive abnormal extra-high voltages such as lightning strikes; third, for about 90% of power transmission and distribution faults, ground fault current is minimized and continuous operation is possible without power outages; fourth, when excessive abnormal extra-high voltages such as lightning strikes occur, it can be handled safely and quickly; and fifth, there is an enhanced effect that can more safely prevent casualties and fire hazards. Brief explanation of the drawing

[0019] Figure 1 is a general building grounding structure diagram. Figure 2 is a mesh voltage distribution diagram Figure 3 shows a two-dimensional voltage distribution in the mesh. Figure 4 shows the three-dimensional voltage distribution in the mesh. FIG. 5 is a first embodiment of a proposed current control-based parallel grounding device. FIG. 6 is a second embodiment of the proposed current control-based parallel grounding device. Specific details for implementing the invention

[0020] The present invention has been described with reference to the attached drawings for preferred embodiments. However, embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited to the embodiments described in detail below, but is provided to provide a more complete explanation to those skilled in the art.

[0021] FIG. 1 shows a general building grounding structure diagram. In the case of a general building grounding structure diagram, high-resistance grounding rods (12) are generally placed at regular intervals on the outer side of the mesh conductor (11), and low-resistance grounding rods are also placed when necessary.

[0022] FIG. 2 shows a mesh voltage distribution diagram. The mesh conductor (11) is characterized by the fact that the voltage is generally reduced in the conductor portion, and the voltage tends to increase between conductors.

[0023] Figure 3 shows a two-dimensional voltage distribution in the mesh, and Figure 4 shows a three-dimensional voltage distribution in the mesh. It can be confirmed through simulation that the voltage is reduced in the conductor portions, and the voltage increases between conductors.

[0024] FIG. 5 shows a first embodiment of a proposed current-controlled parallel grounding device, and FIG. 6 shows a second embodiment of a proposed current-controlled parallel grounding device.

[0025] In the above-mentioned parallel grounding device based on current control, a grounding wire (10) for transmitting electricity to the ground is arranged, and a high-resistance grounding rod (12) connected to one end of the grounding wire (10) is connected to a relay unit (21) connected in the middle of the grounding wire (10).

[0026] An overcurrent limiting inductor (14) connected to the above relay unit (21) is arranged, and the overcurrent limiting inductor (14) is connected to a connected low-resistance grounding rod (15), and a grounding resistance reducing agent (16) arranged around the low-resistance grounding rod (15) to reduce grounding resistance is arranged. As a feature of operation, there is a current detection unit (25) for detecting the current of the grounding line (10), a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26), and a relay driving unit (23) for turning on the relay unit (21) when the current comparison unit (24) is above a certain voltage. The technical feature of the current control-based parallel grounding device is a current control-based low-resistance grounding rod line control unit (30).

[0027] The difference between the first embodiment of FIG. 5 and the second embodiment of FIG. 6 is the presence or absence of the overcurrent limiting inductor (14). The overcurrent limiting inductor (14) discharges current generated by excessive abnormal extra-high voltage, such as lightning strikes, to the ground. However, the extra-high voltage can damage the low-resistance grounding rod (15) and causes the resistance value of the low-resistance grounding rod (15) to gradually increase by decomposing the grounding resistance reducing agent (16) into ionic components. Therefore, to prevent this, the overcurrent limiting inductor (14) [reduces] the back electromotive force of the inductor By generating it, there is an effect of preventing damage to the low-resistance grounding rod (15) or decomposition of the grounding resistance reducing agent (16) from the extra-high voltage.

[0028] Therefore, a person with ordinary knowledge of this field can selectively apply the overcurrent limiting inductor (14), and the overcurrent limiting inductor (14) places a coil at one end of the low-resistance grounding rod (15).

[0029] The resistance value of the low-resistance grounding rod (15) is characterized in that it is in the range of 0.1 to 2 ohms, and the high-resistance grounding rod (12) has a grounding current of 1 to 5 A flowing through it, which minimizes the ground fault current of a power transmission and distribution fault and enables continuous operation without power outage, and the low-resistance grounding rod (15) has a grounding current of hundreds to thousands of A flowing through it and is characterized in that it discharges the current generated by excessive abnormal extra-high voltage, such as lightning strikes, into the ground.

[0030] The above high-resistance grounding rod (12) allows a grounding current of 1 to 5 A to flow, thereby minimizing the ground fault current of power transmission and distribution failures and enabling continuous operation without power outages, and the above low-resistance grounding rod (15) allows a grounding current of hundreds to thousands of A to flow, and by discharging the current generated by excessive abnormal extra-high voltage such as lightning strikes into the ground, about 90% of power transmission and distribution failures allow for the minimization of ground fault currents and continuous operation without power outages, and at the same time, by safely and quickly responding to the occurrence of excessive abnormal extra-high voltage such as lightning strikes, it has an enhanced effect of more safely preventing casualties and fire hazards.

[0031] The present invention relates to a parallel grounding device based on current control, comprising: a grounding wire (10) for transmitting electricity to the ground; a high-resistance grounding rod (12) connected to one end of the grounding wire (10); a relay unit (21) connected to the middle of the grounding wire (10); an overcurrent limiting inductor (14) connected to the relay unit (21); a low-resistance grounding rod (15) connected to the overcurrent limiting inductor (14); a current detection unit (25) for detecting the current flowing through the grounding wire (10); a grounding resistance reducing agent (16) placed around the low-resistance grounding rod (15) to reduce the grounding resistance; and a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26). We propose a current-control-based parallel grounding device characterized by a current-control-based low-resistance grounding rod line control unit (30) that includes a relay driving unit (23) for turning on the relay unit (21) based on the value of the current comparison unit (24).In addition, the present invention provides a current control-based parallel grounding method comprising: a grounding wire (10) for transmitting electricity to the ground; a high-resistance grounding rod (12) connected to one end of the grounding wire (10); a relay unit (21) connected to the middle of the grounding wire (10); an overcurrent limiting inductor (14) connected to the relay unit (21); a low-resistance grounding rod (15) connected to the overcurrent limiting inductor (14); a current detection unit (25) for detecting the current flowing through the grounding wire (10); a grounding resistance reducing agent (16) placed around the low-resistance grounding rod (15) to reduce the grounding resistance; and a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26). A current control-based parallel grounding method is proposed, comprising: a first step of installing a current control-based parallel grounding device characterized by a relay driving unit (23) for turning on the relay unit (21) based on the value of the current comparison unit (24); a second step of determining the current value detected by the current detection unit (25) after the first step; a third step of turning off the relay unit (21) based on the current value detected by the current detection unit (25) after the second step so that the grounding wire (10) is connected to the high-resistance grounding rod (12); and a fourth step of turning on the relay unit (21) based on the current value detected by the current detection unit (25) after the third step so that the grounding wire (10) is connected to the low-resistance grounding rod (12).

[0033] The above description is merely an illustrative explanation of the technical concept of the present invention. The present invention can be applied to a current-control-based parallel grounding device and method by various modifications by a person skilled in the art, and the scope of technology that can be easily modified technically should also be recognized as falling within the scope of the rights of this patent. Explanation of the symbols

[0035] 10: Ground wire 11 : Mesh conductor 12: High-resistance grounding rod 13: Building vertical supports 14: Overcurrent limiting inductor 15: Low-resistance grounding rod 16 : Grounding resistance reducing agent 17: Ground wire and mesh conductor contact point 18 : Ground 21: Relay Section 23: Relay drive unit 24: Current Comparator 25: Current detection unit 26 : Reference current 30: Current control-based low-resistance grounding rod line control unit

Claims

Claim 1 A current-controlled parallel grounding device comprises: a grounding wire (10) for transmitting electricity to the ground; a high-resistance grounding rod (12) connected to one end of the grounding wire (10); a relay unit (21) connected to the middle of the grounding wire (10); an overcurrent limiting inductor (14) connected to the relay unit (21); a low-resistance grounding rod (15) connected to the overcurrent limiting inductor (14); a current detection unit (25) for detecting the current flowing through the grounding wire (10); a grounding resistance reducing agent (16) placed around the low-resistance grounding rod (15) to reduce the grounding resistance; a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26); and a relay driving unit (23) for turning on the relay unit (21) based on the value of the current comparison unit (24). A parallel grounding device based on current control featuring a line control unit (30) Claim 2 A current-control-based parallel grounding device according to claim 1, comprising a current-control-based low-resistance grounding rod line control unit (30) that controls the flow of current to the high-resistance grounding rod (12) or the low-resistance grounding rod (15) based on a value detected by the current detection unit (25). Claim 3 In claim 1, the overcurrent limiting inductor (14) is the back EMF of the inductor A current-control-based parallel grounding device characterized by generating Claim 4 A current-control-based parallel grounding device according to claim 1, characterized in that the overcurrent limiting inductor (14) prevents damage to the low-resistance grounding rod (15) or decomposition of the grounding resistance reducing agent (16) from extra-high voltage by reducing the overcurrent flowing through the low-resistance grounding rod (15). Claim 5 A current-control-based parallel grounding device according to claim 1, characterized in that the resistance value of the high-resistance grounding rod (12) is in the range of 10 to 90 ohms; and the resistance value of the low-resistance grounding rod (15) is in the range of 0.1 to 2 ohms. Claim 6 In a current control-based parallel grounding method, a grounding wire (10) for transmitting electricity to the ground; a high-resistance grounding rod (12) connected to one end of the grounding wire (10); a relay unit (21) connected to the middle of the grounding wire (10); an overcurrent limiting inductor (14) connected to the relay unit (21); a low-resistance grounding rod (15) connected to the overcurrent limiting inductor (14); a current detection unit (25) for detecting the current flowing through the grounding wire (10); a grounding resistance reducing agent (16) placed around the low-resistance grounding rod (15) to reduce the grounding resistance; and a current comparison unit (24) for comparing the current value detected by the current detection unit (25) with a reference current (26). A current control-based parallel grounding method characterized by: a first step of installing a current control-based parallel grounding device comprising a relay driving unit (23) for turning on the relay unit (21) based on the value of the current comparison unit (24); a second step of determining the current value detected by the current detection unit (25) after the first step; a third step of turning off the relay unit (21) based on the current value detected by the current detection unit (25) after the second step so that the grounding wire (10) is connected to the high-resistance grounding rod (12); and a fourth step of turning the relay unit (21) to a turn-on state based on the current value detected by the current detection unit (25) after the third step so that the grounding wire (10) is connected to the low-resistance grounding rod (12).

Images