KR20190122444A - System for earth leakage circuit breaking - Google Patents

Abstract

The present invention relates to a system of preventing electric leakage. The system of preventing electric leakage comprises: a first determiner including an input port connected with an output terminal of a first image current transformer, an output port connected with an input terminal of a first circuit breaker, a first LAN port, and a second LAN port; a second determiner including an input port connected with an output terminal of a second image current transformer, an output port connected with an input terminal of a second circuit breaker, a first LAN port, and a second LAN port; and a main unit connected to the first LAN port of the first determiner by any one LAN cable. The second LAN port of the first determiner and the first LAN port of the second determiner are connected by another LAN cable. Each of the first determiner and the second determiner analyzes a signal input to the input port and outputs a cutoff signal to the output port when it is determined that electric leakage occurs. The main unit monitors states of the first determiner and the second determiner.

Description

Earth leakage protection system {SYSTEM FOR EARTH LEAKAGE CIRCUIT BREAKING}

One embodiment of the present invention relates to a ground fault interruption system, and more particularly, to a ground fault interruption system having improved construction efficiency and city park competitiveness.

An earth leakage breaker is a device that determines that an earth leakage current caused by an electric leakage or insulation breakdown in a case or an outer part of an electrical and electronic device is a certain value or more, and cuts off the electric current within a predetermined time. And an earth leakage detector, an image current transformer, a blocking mechanism, and the like.

The operation principle of the earth leakage breaker is briefly described as follows. First, when a short circuit occurs, a difference occurs in the current flowing along the power line passing through the image current transformer. The magnetic flux is generated in the image current transformer by this current difference, and the current flows in the secondary winding wound on the image current transformer. By using the current flowing in this manner, the ground fault detecting unit detects a ground fault. In addition, when a ground fault is detected, the ground fault detection unit operates the ground fault trip mechanism or the like to cut off the circuit by the blocking mechanism.

In general, in the case of power distribution facilities for supplying power by building unit or factory unit, integrated monitoring of a short circuit is required. In the related art, for this purpose, the detectors for detecting a short circuit and outputting a cutoff signal to a breaker are located at a predetermined position. In addition, it was possible to check whether a short circuit was blocked by displaying a light or a light of a light bulb. However, according to this conventional method, a huge amount of wires was required because each of the current transformers and the breakers distributed in each region had to be connected to each of the breakers collected at a specific position. There was a problem that the efficiency and construction costs are increased.

Republic of Korea Patent Publication No. 10-1834428

According to one embodiment of the present invention can provide an earth leakage blocking system with improved construction efficiency and cost competitiveness of power distribution facilities.

An earth leakage blocking system according to an embodiment of the present invention includes a first port including an input port connected to an output terminal of a first current transformer, an output port connected to an input terminal of a first circuit breaker, a first LAN port, and a second LAN port. Judge; A second determiner including an input port connected to an output terminal of the second image current transformer, an output port connected to an input terminal of the second circuit breaker, a first LAN port, and a second LAN port; And a main unit connected to the first LAN port of the first determiner by one LAN cable, wherein the main unit is connected between the second LAN port of the first determiner and the first LAN port of the second determiner. Connected by another LAN cable, and each of the first determiner and the second determiner analyzes a signal input to the input port and outputs a cutoff signal to the output port if it determines that a short circuit occurs. The state of the first determiner and the second determiner may be monitored.

In this case, when at least one of the first determiner and the second determiner determines that a short circuit occurs, the data including the identification number of the short circuit judged as the short circuit, the detected value at the time of the short circuit and the time information determine the short circuit. It may be transmitted to the main unit through.

The apparatus may further include third to Nth image current transformers, third to Nth circuit breakers, and third to Nth determiners, wherein the first LAN of the Nth determiner is connected to the second LAN of the N-1th determiner. The LAN cable may be connected, and the second LAN port of the Nth determiner may be connected to the main unit via a LAN cable, and N may be selected from natural numbers greater than three.

In addition, the LAN cable may include a communication line and a power line.

In this case, the LAN cable includes first to eighth wires insulated from each other, the + power source for the first and second wires, the-power source for the third and fourth wires, the first communication signal for the fifth and sixth wires, The second communication signal may be applied to the seventh and eighth wires, respectively.

In addition, the first determiner, the display unit for displaying whether or not to output a blocking signal to the output port; And an operation unit configured to receive at least one of an identification address setting value of the first determiner and a first determiner initialization command.

The main unit may include a communication unit to which the LAN cable is connected; A main control unit for analyzing the data received through the LAN cable and monitoring the state of each determiner; And a display device for individually displaying an electric leakage blocking state of each of the first determiner and the second determiner, including an identification number of one determiner selected from the first determiner and the second determiner. When the main control unit generates a short circuit determination reference value change command, only a ground fault determination reference value of the determiner having the corresponding identification number may be changed.

The main unit may include a first communication unit and a second communication unit which are separated from each other, and include a first group including the first to Nth image current transformers, the first to Nth breakers, and the first to Nth determiners. The second group is connected to the first communication unit via the first LAN cable and includes a second group including M video current transformers, M circuit breakers, and M determiners through a second LAN cable independent of the first LAN cable. 2 may be connected to the communication unit, where M may be selected from natural numbers greater than two.

According to one embodiment of the present invention, since the wire usage is significantly reduced than before, the time and cost required for construction can be significantly reduced.

1 is a view schematically illustrating a ground fault blocking system according to an embodiment of the present invention.
2 is a diagram schematically illustrating a determiner of an earth leakage blocking system according to an exemplary embodiment of the present invention.
3 is a diagram schematically illustrating a main unit of an earth leakage blocking system according to an exemplary embodiment of the present invention.
4 is a diagram schematically illustrating a ground fault blocking system according to another exemplary embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. The embodiments may be provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, 'comprise' and / or 'comprising' refers to a component, step, operation and / or element that is mentioned in the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

In addition, the embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal exemplary views of the present invention. In the drawings, detailed sizes, shapes, thicknesses, curvatures, and the like of the components are exaggerated or illustrated for effective explanation of technical contents, and the shapes thereof may be modified due to tolerances and the like.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and effect of the present invention.

1 is a diagram schematically illustrating an earth leakage blocking system 1000 according to an embodiment of the present invention, and FIG. 2 is a diagram schematically illustrating a determiner of an earth leakage blocking system 1000 according to an embodiment of the present invention. 3 is a diagram schematically illustrating a main unit 200 of an earth leakage blocking system 1000 according to an exemplary embodiment of the present invention, and FIG. 4 is an earth leakage blocking system 1000 according to another embodiment of the present invention. Figure is a schematic illustration.

Referring to the drawings, the earth leakage blocking system 1000 according to an embodiment of the present invention includes a blocking unit 10, the image current transformer 20, the determination unit 100 and the main unit 200.

In one embodiment, the blocking unit 10, the image current transformer 20, and the determination unit 100 may include first to Nth unit devices, respectively. That is, the blocking unit 10 includes first to N-th breakers 10-1 to 10 -N, and the image current transformer 20 includes first to N-th image transformers 20-1 to 20 -N. The determination unit 100 may include first to Nth determiners 100-1 to 100 -N. In this case, N may be defined as a natural number greater than 2, 2, 3,. … 20 can be a variety of natural numbers.

In one embodiment, the first determiner 100-1 includes the controller 110, the input port 120, the ADC 130, the output port 140, the first LAN port 150, and the second LAN port ( 160, at least one of the operation unit 170 and the display unit 180.

In one embodiment, the input port 120 may be connected to the output terminal of the first video current transformer 20-1, and the output port 140 may be connected to the input terminal of the first circuit breaker 10-1. The LAN cable 30 may be connected to the two LAN ports 150 and 160.

In one embodiment, the output terminal of the first image transformer 20-1 may mean both ends of the secondary winding wound to the image current transformer, the input port 120 is connected to the ADC 130, an analog digital converter The output current of the image current transformer input to the port 120 may be converted.

In one embodiment, the control unit 110 may include a micro control unit 111 (MCU) and a memory 112 (MEM). In this case, the leakage determination reference value and the detection value may be stored in the memory. In addition, in one embodiment, the first determiner 100-1 may be assigned and stored a unique identification number, which may also be stored in a memory. For example, the first determiner 100-1 may have an identification number of "000000001", which may be implemented in a manner that is recorded in the nonvolatile memory in the manufacturing stage of the first determiner 100-1. Can be. In another embodiment, the first determiner 100-1 may be given a specific identification number input by the user through the manipulation unit 170. For example, the operation unit 170 may be implemented using one or more rotary switches, and a user may set an identification number of the first determiner 100-1 by rotating the rotary switch using a tool such as a driver. As such, the identification number set in the first determiner 100-1 may be used as a kind of address in a communication process with the main unit 200. On the other hand, the initialization command may be input to the determiner through the operation unit 170, accordingly, when the cause of the short circuit is solved so that the normal operation again, if you want to solve a simple malfunction, such as when the identification number initialization, etc. In this case, only a specific judge may be selectively reset so that the desired purpose is achieved.

In one embodiment, the microcontroller unit of the first determiner 100-1 may perform a function of determining whether there is a short circuit by comparing the detected value and the ground fault determination reference value. In addition, the microcontroller unit may generate a cutoff signal and output the output signal to the output port 140 when it is determined that the short circuit. Accordingly, the power of the short circuit may be cut off while the first breaker 10-1 operates.

In an exemplary embodiment, the microcontroller of the first determiner 100-1 may include data such as an identification number of the first determiner 100-1, a detection value at the time of determining a short circuit, time information, and the like. ) Can be sent. Accordingly, the main unit 200 may monitor the state of the first determiner 100-1.

In one embodiment, the detection values of the time point not determined as a short circuit may be transmitted to the main unit 200 at a predetermined period.

In one embodiment, the display unit 180 may perform a function of expressing the state of the first determiner 100-1 to the outside. For example, the display unit 180 may be implemented by using a light bulb that is turned on in the state determined as the short circuit and is turned off in the non-short circuit state. In this case, when there is an error in another function of the first determiner 100-1, for example, a communication function, the bulb may be flickered.

In the second determiner 100-2 to the N-th determiner 100 -N, the description of the first determiner 100-1 may be applied as it is, and thus redundant description thereof will be omitted.

In an embodiment, the main unit 200 may include a main controller 210, a communication unit 220, a power supply unit 230, a first display unit 240, a second display unit 250, and the like.

In one embodiment, the main controller 210 may perform a function of monitoring and analyzing the state of each of the judges by analyzing and processing various data, and similarly to the controller 110 described above, the microcontrol unit 211 (MCU) and Memory 212 and MEM.

In an exemplary embodiment, the first display unit 240 may be implemented as a liquid crystal display, or the like, and various types of information may be output through the first display unit 240 under the control of the main controller 210. For example, various auxiliary information that should be represented by text or numbers in relation to each determiner may be specifically displayed.

In an exemplary embodiment, the second display unit 250 may be implemented as an LED device 251 that is operated in a relatively simple manner such as lighting, turning off, or flashing. For example, if the second display unit 250 is implemented with 100 LED elements, up to 100 states of the determiner may be represented through the second display unit 250.

In one embodiment, the communication unit 220 may be connected to the first LAN port 150 or the second LAN port 160 of each of the determiners through the LAN cable (30).

In one embodiment, the power supply 230 may perform a function of receiving power from the outside of the main unit 200. Meanwhile, in one embodiment, the LAN cable 30 may be implemented to include a communication line and a power line. In this case, some of the power introduced into the main unit 200 through the power supply unit 230 may be connected to the LAN cable 30. Can be provided to the judges. Accordingly, since each of the determiners need not be provided with a separate power supply means, it is possible to reduce the size, light weight, and reduce manufacturing cost of the determiner.

In one embodiment, the LAN cable may include a plurality of wires insulated from each other, may be implemented as a conventional twisted-pair cable widely used to build a local area network, RJ-45 terminal, etc. Can be applied. Using the plurality of wires, a + power source, a-power source, and a transmission / reception signal can be transmitted.

For example, the LAN cable includes first to eighth wires insulated from each other, but includes + power for the first and second wires,-power for the third and fourth wires, first communication signals for the fifth and sixth wires, and The second communication signal may be applied to the seventh and eighth wires, respectively. Here, one of the first and second wires may perform a backup function of the remaining wires, one of the third and fourth wires may perform a backup function of the remaining wires, and one of the fifth and sixth wires may be A backup function of the remaining wires may be performed, and one of the seventh and eighth wires may perform a backup function of the remaining wires. Accordingly, even if any of the strands of each pair of wires is disconnected, it is possible to maintain the transmission state of the power source or communication signal can be improved the reliability of the system.

In one embodiment, an input unit (not shown) may be provided to allow various commands of the user to be input to the main unit 200. In addition, the main unit 200 may adjust the short-circuit detection sensitivity of a specific determiner, for example, the second determiner 100-2, from among the plurality of determiners. In one embodiment, all other determiners determine whether a short circuit is set by the previously set sensitivity, but only the second determiner 100-2 may judge the short circuit by a more sensitive sensitivity, or may cause the short circuit by a looser sensitivity. have. Accordingly, a useful effect of enabling an earth leakage blocking optimized for a situation or condition can be realized. For example, assuming that power distribution is performed from room 1 to room 100, and the main unit 200 monitors this, when the flooding occurs in room 3, the leakage sensitivity of the third determiner may be lowered. In addition, if the risk of fire is increased, such as paint work in room 5, the risk of fire may be reduced by increasing the leakage sensitivity of the fifth determiner.

In one embodiment, between the main unit 200 and the first determiner 100-1 may be connected by a LAN cable 30, the first determiner 100-1 and the second determiner 100-2. ) May be connected to another LAN cable 30. In this case, the data transmitted through the LAN cable 30 may include an identification number of the determiner. Accordingly, the second determiner 100-2 may be connected only to the first determiner 100-1 without connecting the second determiner 100-2 and the main unit 200 with a separate wire or the like. The state information of the can be correctly transmitted to the main unit 200. Accordingly, since all of the respective determiners do not need to be individually connected to the main unit 200, the wire usage can be significantly reduced compared to the prior art.

In an embodiment, the first determiner 100-1 to the Nth determiner 100 -N may be connected in series using the LAN cable 30, in which case the Nth determiner 100 -N The N-1 transmits data to the main unit 200 via the first determiner. On the other hand, if the additional LAN cable 30 is further provided between the second LAN port 160 and the main unit 200 of the N-th determiner, starting from the main unit 200 through the first to N-th determiner A loop connected to the main unit 200 may be formed. In this case, the deviation of the time required for exchanging data between the determiners and the main unit 200 may be reduced, and even if a disconnection or a failure of the determiner occurs at a predetermined position, The number of determiners that are disconnected from communication and power can be minimized, so the stability of the system can be further improved.

Referring to FIG. 4, the earth leakage blocking system 2000 according to an embodiment of the present invention may connect a plurality of groups connected in series by a LAN cable 30 to the main unit 200, but may utilize a plurality of channels. It can be understood that there is.

For example, as illustrated in FIG. 1, if a group including the first to Nth image current transformers, the first to Nth breakers, and the first to Nth determiners is defined as the first group G1, the example is illustrated in FIG. 4. As shown, starting from the main unit 200, the main unit 200 again through the LAN cable 30a, the first group G1, the LAN cable 30c, the second group G2, and the LAN cable 30b. ) Can be connected to the loop, and additionally, starting from the main unit 200, the LAN cable 30d, the third group G3, the LAN cable 30e, the fourth group G4, and the LAN cable 30f. It may also form a loop that is connected to the main unit 200 again through). In this case, the LAN cables 30a and 30b may be connected to the first communication unit 221 illustrated in FIG. 3, and the LAN cables 30d and 30f may be connected to the second communication unit 222. By using this method, various effects such as improvement of convenience of construction, reduction of city parks, and improvement of system stability can be realized while centrally managing a large number of judgment machines. Meanwhile, although only the first to fourth groups G4 are illustrated in FIG. 4, it can be fully understood that it is also possible to additionally connect the fifth group, the sixth group, and the like as necessary.

1000: earth leakage blocking system
10: breaker
20: video current transformer
30: LAN cable
100: judgment unit
110: control unit
120: input port
130: ADC
140: output port
150: first LAN port
160: second LANport
170: control panel
180: display unit
200: main unit
210: subject fisherman
220: communication unit
230: power supply
240: first display unit
250: second display unit

Claims (8)

A first determiner including an input port connected to an output terminal of the first image current transformer, an output port connected to an input terminal of the first circuit breaker, a first LAN port, and a second LAN port;
A second determiner including an input port connected to an output terminal of the second image current transformer, an output port connected to an input terminal of the second circuit breaker, a first LAN port, and a second LAN port; And
And a main unit connected to the first LAN port of the first determiner by any one LAN cable.
The second LAN port of the first determiner and the first LAN port of the second determiner are connected by different LAN cables,
Each of the first determiner and the second determiner analyzes a signal inputted to the input port and outputs a cutoff signal to the output port if it determines that a short circuit occurs.
And the main unit monitors a state of the first determiner and the second determiner.
The method according to claim 1,
If at least one of the first determiner and the second determiner determines that a short circuit occurs, data including an identification number of the determiner determined as a short circuit, a detected value at the time of determining the short circuit, and time information may be stored through the LAN cable. Earth leakage blocking system, characterized in that the transmission to the main unit.
The method according to claim 2,
And further comprising third to Nth image current transformers, third to Nth circuit breakers, and third to Nth determiners.
The first LAN port of the Nth determiner is connected to the second LAN port of the N-1th determiner by a LAN cable, and the second LAN port of the Nth determiner is connected to the main unit by a LAN cable, N is a natural leakage blocking system, characterized in that greater than 3.
The method according to claim 2,
The LAN cable is a ground fault blocking system, characterized in that it comprises a communication line and a power line.
The method according to claim 4,
The LAN cable includes first to eighth wires insulated from each other, the + power source for the first and second wires, the-power source for the third and fourth wires, the first communication signal for the fifth and sixth wires, and the seventh wire. And a second communication signal applied to the eighth wire, respectively.
The method according to claim 2,
The first determiner may include a display unit which displays whether a cutoff signal is output to an output port; And an operation unit configured to receive at least one of an identification address set value of the first determiner and an initializing command of the first determiner.
The method according to claim 1,
The main unit,
A communication unit to which the LAN cable is connected;
A main control unit for analyzing the data received through the LAN cable and monitoring the state of each determiner; And
A display device for individually displaying a ground fault blocking state of each of the first and second determiners;
Including,
If the main control unit generates an instruction for changing the leakage judgment criterion value including an identification number of one of the first and second judges, only the leakage judgment reference value of the determiner having the identification number is changed. A ground fault interruption system characterized by the above.
The method according to claim 3,
The main unit includes a first communication unit and a second communication unit which are separated from each other,
A first group including the first to Nth current transformers, the first to Nth breakers, and the first to Nth determiners is connected to the first communication unit through a first LAN cable;
A second group comprising M video current transformers, M circuit breakers, and M judges is connected to the second communication unit via a second LAN cable independent of the first LAN cable, wherein M is a natural number greater than two. A ground fault interruption system characterized by the above.

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