KR20200112789A - A Method For Sealing A Power Meter And Preventing An Illegal Use Of Electricity - Google Patents

Abstract

The present invention relates to a temper-proof power meter system. The power meter system includes: a printed circuit board including a communication circuit that can be connected to a server through a network, a connection part electrically connected to a busbar of a distribution board, and a power measurement circuit for measuring power; a power meter housing compatible with a branch circuit breaker of the distribution board and accommodating the printed circuit board; a busbar terminal grounding unit connected to the connection part and including a fixing screw groove for fixing the busbar; an insulating waterproof support member receiving the busbar terminal grounding unit, fixing the busbar terminal grounding unit, and having a fixing screw fastening hole connected to the fixing screw groove; a waterproof ring supported by the insulating waterproof support member and a support jaw of the power meter housing to waterproof the printed circuit board accommodated in the power meter housing; and a terminal cover that is combined with the power meter housing and covers the insulating waterproof support member together with a part of the power meter housing. The terminal cover prevents the fixing screw groove and the fixing screw fastening hole from being exposed to the outside when coupled to the power meter housing, the terminal cover includes a first terminal cover sealing hole, a second terminal cover sealing hole, and a terminal cover sealing screw, and the first sealing seal may be broken when the terminal cover is separated from the power meter housing by passing through the first terminal cover sealing hole, a terminal cover sealing screw sealing hole, and the second terminal cover sealing hole.

Description

A Method For Sealing A Power Meter And Preventing An Illegal Use Of Electricity

The present invention relates to a method for sealing and preventing electrical conduction of a power meter, and more particularly, to a method for sealing and preventing electrical conduction of a power meter capable of improving durability and waterproofness by sealing precisely.

Recently, technologies for monitoring individual households' power consumption or usage habits through PCs or smartphones are being actively developed. In particular, technologies for checking the amount of power through an Internet network or a connection device such as Bluetooth or Zigbee are being actively developed. These technologies require a connection between the user's power measurement device and the communication device.

In order to solve this problem, for example, Korean Patent Registration No. 10-1555942 proposes a device for mounting a power measuring device compatible with a branch breaker in a distribution panel on a distribution panel and transmitting the collected power usage to a monitoring device through wireless communication.

However, in order to use such a power measuring device as a power meter for charging an electricity bill, it is necessary to exclude the possibility of unauthorized intrusion in order to extract power usage. That is, the sealing means (sealing means) and conduction prevention techniques should be applied so that the power measurement device may be removed without permission after installation, or elements that influence the power consumption measurement without permission may be excluded. Exclusion of the possibility of intrusion using such sealing means (sealing means) is a legal obligation.

However, the recently developed power measuring device using a network did not have such a sealing means, so it was difficult to be used as a meter that is a standard for calculating billing, but a network-based power meter is urgently required for accurate and convenient meter reading.

The problem to be solved by the present invention is to provide a power measuring device that can be legally installed as a meter by sealing a power meter installed in a distribution panel.

Another problem to be solved by the present invention is to provide a power meter with improved durability and waterproofness when sealing.

In order to solve the above-described problems, the power metering device capable of preventing conduction according to an embodiment of the present invention includes a communication circuit that can be connected to a server through a network, a connection part electrically connected to a busbar of a distribution board, and a power measuring power. A printed circuit board including a measurement circuit; A power meter housing compatible with a branch breaker of a distribution board and accommodating a printed circuit board; A busbar terminal grounding unit connected to the connection unit and including a fixing screw groove for fixing the busbar; Insulation waterproof support member receiving the busbar terminal grounding portion, fixing the busbar terminal grounding portion, and having a fixing screw fastening hole connected to the fixing screw groove; A waterproof ring supported by the insulating waterproof support member and the support jaws of the power meter housing, and waterproofing the printed circuit board accommodated in the power meter housing; And a terminal cover coupled with the power meter housing and covering an insulating waterproof support member with a part of the power meter housing, wherein the terminal cover does not expose the fixing screw groove and the fixing screw fastening hole to the outside when it is combined with the power meter housing. The terminal cover includes a first terminal cover sealing hole, a second terminal cover sealing hole, and a terminal cover sealing screw, and the first sealing seal is a first terminal cover sealing hole, a terminal cover sealing screw sealing hole, and a second terminal. It is destroyed when the terminal cover is separated from the power meter housing through the cover sealing hole. Accordingly, it is possible to significantly reduce the measurement distortion rate by improving the conductive prevention structure of the power meter installed in the distribution panel.

According to another feature of the present invention, further comprising a product body sealing portion, the product body sealing portion includes a product body sealing cover, a product body sealing screw and a product body sealing hole, and the second sealing seal is the product body sealing cover is a power meter It can be destroyed if the lower plate and the upper plate of the power meter housing are separated by passing through the product body sealing hole and the product body sealing screw sealing hole in the state of being combined with the housing.

According to another feature of the present invention, the insulating waterproof support member is fixed by the busbar terminal fixing screw, and the terminal cover may prevent the busbar terminal fixing screw from being exposed when it is combined with the power meter housing.

According to another feature of the present invention, the busbar terminal fixing screw includes a female threaded portion on the head of the busbar terminal fixing screw, and the terminal cover sealing screw may be coupled with the female threaded portion when the terminal cover is coupled to the power meter housing. .

According to another feature of the present invention, the communication circuit includes a wired communication means and a wireless communication means, and the wired communication means is an external device by a wired communication cable passing through a waterproof cap that airtightly closes the cable hole provided in the power meter housing. Can connect to

According to another feature of the present invention, it further comprises a CT sensor for measuring a current, wherein the CT sensor is installed on a connection cable connecting the busbar and the parking terminal of the distribution board, and the printed circuit board by the CT cable passing through the waterproof cap And can be connected.

According to another feature of the present invention, the CT sensor may be formed in one of a ring shape and a ZMFFLQ type pair.

According to another feature of the present invention, the CT sensor includes a conductive prevention case, and the conductive prevention case may include a graphite sheet layer, a ferrite sheet layer, and a spherical conductive prevention case housing.

According to another feature of the present invention, the conduction prevention case surrounds the ferromagnetic core of the CT sensor, and the conduction prevention case allows the graphite sheet layer and the ferrite sheet layer to be installed according to the shape of the surface of the spherical conduction prevention case housing. It may further include a spherical support.

Details of other embodiments are included in the detailed description and drawings.

The present invention can seal the power meter installed in the distribution panel to maintain the integrity of the measurement from external intrusion.

The present invention can significantly reduce measurement distortion due to external conduction by improving the structure of preventing electrical conduction of the power meter installed in the distribution panel.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is an overall configuration diagram of a power metering system according to an embodiment of the present invention.
2 is a perspective view of a distribution board according to an embodiment of the present invention.
3 is an enlarged perspective view of a power meter according to an embodiment of the present invention.
4A is an exploded perspective view illustrating a waterproof structure of a power meter according to an embodiment of the present invention.
4B is an exploded perspective view illustrating a sealing structure of a power meter according to an embodiment of the present invention.
5 is a view for explaining a terminal sealing method of a power meter according to an embodiment of the present invention.
6 is a perspective view of a CT sensor of a power meter according to an embodiment of the present invention.
7 is a perspective view of a CT sensor of a power meter according to another embodiment of the present invention.
8 is a perspective view of a distribution board according to an embodiment of the present invention.
9 is a view for explaining a power meter including a conductive prevention means including a magnetic field recognition sensor according to an embodiment of the present invention.
10 is a view for explaining a power meter including a conductive prevention means using a dual CT sensor according to an embodiment of the present invention.
11 is a view for explaining a power meter including a conductive prevention means using a resonance circuit according to an embodiment of the present invention.
12 is a view for explaining a power meter including a conductive prevention means using a wireless communication means according to an embodiment of the present invention.
13 is a view for explaining a power meter having a conductive prevention means using diversity according to an embodiment of the present invention.
14 is a view for explaining a power meter including a conductive prevention means using a dummy load according to an embodiment of the present invention.
15 to 17 are views for explaining a power meter including a spherical conduction prevention case according to an embodiment of the present invention.

The following content merely illustrates the principle of the invention. Therefore, although those skilled in the art may implement the principles of the invention and invent various devices included in the concept and scope of the invention, although not clearly described or illustrated herein. In addition, it should be understood that all conditional terms and examples listed in this specification are, in principle, expressly intended only for the purpose of making the concept of the invention understood, and are not limited to the embodiments and states specifically listed as such. do.

In addition, in the following description, ordinal expressions such as first, second, etc. are intended to describe objects that are equivalent and independent of each other, and in the order of main/sub or master/slave It should be understood as meaningless.

The above-described objects, features, and advantages will become more apparent through the following detailed description in connection with the accompanying drawings, and accordingly, a person of ordinary skill in the technical field to which the invention pertains will be able to easily implement the technical idea of the invention. .

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, and as a person skilled in the art can fully understand, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other. It may be possible to do it together in a related relationship.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a distribution board, which is an environment in which a power meter according to an embodiment of the present invention is installed, will be described in detail with reference to FIGS. 1 to 3.

1 is an overall configuration diagram of a power metering system according to an embodiment of the present invention. 2 is a schematic plan view of a distribution board according to an embodiment of the present invention. 3 is an enlarged perspective view of a power meter according to an embodiment of the present invention.

Referring to FIG. 1, the power meter 110 of the power metering system according to the present invention is connected to the home appliance 600 and the server 900, and may be installed in the distribution board 100. Preferably, the power meter 110 according to the present invention may be connected to an external network such as the Internet by being connected to a router or a home gateway in order to transmit data measured from the distribution board 100 to the server 900 through a network.

The distribution board 100 is an electrical safety device including a circuit breaker, an earth leakage circuit breaker, and a surge protective device (SPD) to branch the incoming power into a plurality of branch circuits and block the circuit when an abnormal current occurs. , A parking circuit breaker 140, a plurality of branch circuit breakers 130 and a power meter 110.

In more detail, the short-circuit parking 140 is installed inside the distribution panel 100 to cut off total power.

The branch circuit breaker 130 is a configuration for cutting off power for each home appliance 600 that is installed inside the distribution panel and is electrically connected to the distribution panel 100, and a plurality of branch circuit breakers 130 are provided with a bus bar 120 of the distribution panel 100. ) Is fixed.

The bus bar 120 is composed of a copper plate manufactured to easily connect the power input terminals of the plurality of branch circuit breakers 130 and is connected to the power input terminals of each branch circuit breaker 130 and the power meter 110 according to the present invention. . In other words, the busbar 120 is connected through the power input terminal of the branch circuit breaker 130 installed at a predesigned position and the fixed end of the busbar 120.

The power meter 110 measures the power usage of all devices supplied with power through a distribution board such as the home appliance 600 and transmits the measured data to the server 900 through a network. The power meter 110 is fixed to the bus bar 120 installed in the distribution board 100, as shown in FIG. 2. On the other hand, the power meter 110 is sealed including the lower plate 111, the upper plate 112, the terminal cover 114 and the waterproof cap 113, as shown in Figure 3, the detailed configuration of the power meter 110 A detailed description will be described later.

In general, the power measuring device connected to the external monitoring device is connected to the CT sensor through a CT cable for current measurement. It is advantageous to fix it in the distribution panel due to the limit of the length of the wire, but the internal space may be different for each distribution panel. If the free space in the distribution board cannot be secured, installation may be impossible due to the limitation of the installation space.

In addition, due to the limitation of the allowable space when installing the power measuring device inside the distribution panel, in all cases, it is impossible to install the wireless communication antenna in the direction required by the supplier. In addition, when the wireless antenna of the product is installed differently from the direction suggested by the supplier, there is a problem that the communication sensitivity is significantly lowered.

Therefore, the power meter 110 according to the present invention is compatible with the branch circuit breaker 130 and can be fixed to the busbar 120 in order to solve the above-described problem, so that the power meter is distributed as a distribution board while eliminating the inconvenience of product installation. It can be easily fastened inside.

Meanwhile, the server 900 may receive measurement data from the power meter 110, analyze and store power usage and power usage patterns of customers based on the received measurement data. Additionally, it is possible to analyze the power of the devices connected to the power meter 110 as power of each device through Non-Intrusive Load Monitoring (NILM). Alternatively, the home appliance 600 connected to the power meter 110 may be individually controlled based on the power analysis of each device, or a power saving guide may be generated and transmitted for the power consumption of each device.

Hereinafter, the internal sealing structure of the power meter 110 will be described with reference to FIGS. 4A to 4B.

4A is an exploded perspective view illustrating an internal structure of a power meter according to an embodiment of the present invention. 4B is an exploded perspective view for explaining the overall waterproof structure of a power meter according to an embodiment of the present invention.

Referring to FIG. 4A, the power meter 110 includes an insulating waterproof support member 410, a terminal ground part 440, and a connection part 430.

The insulating waterproof support member 410 is a structure that performs insulation and waterproof functions when power is supplied from the distribution panel 100 to the power meter 110, and is a distribution panel so that the bus bar 120 of the distribution panel 100 can be sealed and fixed. It includes a terminal ground portion 440 of 100, a busbar terminal fixing screw 450, and a waterproof ring (O-ring) guide 470.

The insulating waterproof support member 410 is a waterproof ring that is disposed above the connection part 430 through two connection parts 430 on the printed circuit board 420 as shown in FIG. 4A to prevent water from entering the connection part 430 (460) can be mounted in the correct position. In addition, a distribution panel busbar terminal hole 445 is formed on the upper surface of the insulating waterproof support member 410, and a branch of the busbar of the distribution panel or a conducting wire 125 connected to the busbar is a terminal in the front of the insulating waterproof support member 410 Two fixing screw fastening holes 443 to which the busbar terminal fixing screws 450 can be fastened are formed to be fastened to the ground part 440.

Therefore, the power introduced through the busbar 120 is applied to the power meter 110 through the terminal grounding part 440 and the connection part 430, and the power meter collects various power information of customers such as voltage through this. can do.

Specifically, the busbar terminal grounding part 440 is accommodated in the insulating waterproofing support member 410 while being inserted into the distribution panel busbar terminal hole 445 on the upper surface of the insulating waterproofing support member 410. At this time, the waterproofing ring holder 470 of the insulating waterproofing support member 410 mounts the waterproofing ring 460 in a proper position and is in airtight contact with the waterproofing ring 460 during installation. Accordingly, when water is about to be introduced from the top or side, the waterproof ring 460 and the waterproof ring holder 470 can prevent water from flowing into the printed circuit board 420. The waterproof ring holder 470 protrudes to one side of the insulating waterproof support member 410 and preferably protrudes in a direction to be coupled to the terminal cover 114 to maintain the waterproof structure when the lower plate and the upper plate are combined. Arranging the waterproofing ring holder 470 on the insulating waterproofing support member 440 in this way requires a hole for sealing in the terminal cover. Therefore, in order to prevent water from entering through the sealing hole of the terminal cover, insulation waterproofing A waterproof ring holder 470 is provided on the support member 410.

At this time, on the printed circuit board 420, for example, wireless communication means 423 such as WiFi, wired communication means 427 for serial communication such as RS-232, and antenna means 425 of the wireless communication means 423 ) And a control unit 426 implemented as a microprocessor or the like may be provided. In this case, the wired communication means 427 is used when connecting with an external monitoring means (not shown) by wire, and the wireless communication means 423 can be used when connecting with an external monitoring means (not shown) or the server 900. . Meanwhile, the antenna means 425 may preferably be an antenna having directivity in the direction of the nameplate 121, and since it has a fixed directivity, the reception sensitivity of the wireless communication means 423 can be increased.

Subsequently, the lower portion of the terminal ground portion 440 and the upper portion of the connection portion 430 are connected to each other. In this case, it may be fixed with a separate screw (not shown) to the fastener on the lower portion of the terminal ground portion 440 and the upper portion of the connection portion 430.

Meanwhile, referring to FIG. 4B, the power meter 110 includes an upper plate 112, a lower plate 111, a printed circuit board 420, a waterproof ring 460, and a terminal cover 114.

The lower plate 111 includes two busbar terminal holes on the upper surface to be fastened with the bus bar 120 of the distribution board 100, and supports the printed circuit board 420, the waterproof ring 460, and the upper plate 112 It is a support for doing.

The printed circuit board 420 may be fastened to the insulating waterproof support member 410 and fixed to the lower plate 111 as described above.

The waterproof ring 460 is a rubber ring for improving the waterproof function of the power meter 110, and is disposed between the upper plate 112 and the lower plate 111 so that water does not enter the inside of the power meter 110. . The waterproof ring 460 is disposed to correspond to the edge of the printed circuit board 420 from the bottom surface of the waterproof structure, as shown in FIG. 4B.

Various configurations for operating the power meter 110 may be disposed on the upper plate 112. For example, LCD display (116), communication (Wi-Fi) reset key (118), product reset key (119), CT cable (160-1), name plate (121, specification description), product body seal (128) ).

* Hereinafter, a terminal sealing means according to an embodiment of the present invention will be described with reference to FIG. 5. 5 is a view for explaining a terminal sealing method of a power meter according to an embodiment of the present invention.

5 (a), (b), and (c), the power meter 110 is fixed with the distribution board fixing screw 450, then the terminal cover 114 is closed and a separate terminal cover sealing screw 115 is tightened. It may be mounted inside the distribution panel 100, and the terminal cover 114 may be closed without the distribution panel fixing screw 450 and fixed to the distribution panel 100 only with the terminal cover sealing screw 115.

5 (a) and (b), the power meter 110 is fixed to the distribution panel 100 through the distribution panel fixing screw 450, and the terminal cover 114 is a separate terminal cover sealing screw 115 It may be fixed to the power meter 110 by.

In this case, FIG. 5(b) includes a female screw part 452 that can be coupled with the terminal cover sealing screw 115 in the head of the distribution board fixing screw 450, and the terminal cover sealing screw 115 and the distribution board are fixed. When the screw 115 is coupled, it may move together to fix the power meter 110 to the distribution board 100 and at the same time fix the terminal cover 114 to the power meter 110. The terminal cover sealing screw 115 has a screw sealing hole 115-1, and the terminal cover 114 has a terminal cover sealing hole 114-1. At this time, as shown in Figure 3, the sealing seal (114-3) is the second terminal cover sealing hole (114-2) again through the first terminal cover sealing hole (114-1), the screw sealing hole (115-1). It passes through and seals the terminal of the power meter 110. At this time, when the terminal cover 114 is combined with the power meter housing, the fixing screw groove and

The fixing screw fastening hole 443 of the insulating waterproof support member is not exposed to the outside. Accordingly, when the terminal cover 114 is separated from the power meter 110, the sealing seal 114-3 is destroyed. Here, "destructed" includes all cases where at least part of the sealing seal (including a part that looks like a thread extending from the sealing seal) is broken, and when the sealing seal is destroyed, there is an external intrusion into the power meter 110. Can be considered.

On the other hand, the present invention is a terminal cover 114 and a power meter 110 with a sealing screw 115 that is longer than the length of the sealing screw 115 shown in Figs. 5 (a) and (b) as shown in Fig. 5 (c). Can also be fixed at once.

In this case, the size of the terminal cover 114 may be different from each other according to the presence and type of the distribution board fixing screw 450 as shown in FIGS. 5 (a), (b) or 5 (c).

Meanwhile, the product body sealing part 128 may include a product body sealing cover 128-1, a product body sealing screw 128-2, and a product body sealing hole 128-3. In this case, the product body may be sealed in a structure similar to that of FIGS. 5(a), 5(b), and 5(c). In addition, at this time, the product body sealing screw (128-2) is coupled with the female threaded portion (128-4, see Fig. 4b) of the lower plate of the power meter 110, so that intrusion from the outside of the product can be fundamentally prevented. Can be sealed inside.

Even in this case, the product main body sealing part 128 may be sealed by a separate sealing seal in the same way as the terminal cover sealing part, and in the case of destruction, it may be considered that there has been an external intrusion into the power meter 110.

Therefore, the power meter 110 according to the embodiment of the present invention uses the distribution panel 100, the fixing screw 450, the terminal cover sealing screw 115, and the product body sealing screw 128-1. It has the effect of sealing airtightly inside/outside.

In addition, the present invention can implement a waterproof function that can effectively prevent water from entering the power meter 110 by installing the insulating waterproof support member 410 and the waterproof ring 460 in the power meter 110.

Hereinafter, the CT sensor 150 of the power meter 110 according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7.

6 is a perspective view of a CT sensor in a distribution panel according to an embodiment of the present invention. 7 is a perspective view of a CT sensor of a power meter according to another embodiment of the present invention.

In the present invention, it has been described that the CT sensor 150 is formed in a clip shape as shown in FIG. 6, but may be formed in a ring shape as shown in FIG. 7.

The clip portions 150 and 650 of the CT sensor are in the form of a clip or a ring, and the clip portions 150 and 650 of the CT sensor are coupled to the connection cable 170 between the parking terminal 140 and the bus bar 120, In particular, the clip-shaped clip portion 150 includes an upper end portion having an'n' shape to facilitate installation on the connection cable 170. The clip portions 150 and 650 of the CT sensor are connected to the CT cable 160-1 and the serial communication cable 160-2, and printed through the waterproof cap 113 disposed at the bottom of the side of the power meter 110 It may be connected to the circuit board 420. The waterproof cap 113 may airtightly close the cable hole 113-1 of the lower plate. Accordingly, according to the present invention, when the CT sensor 750 is formed in a ring shape, there is an effect of efficiently utilizing the space.

On the other hand, so far, a method of preventing physical intrusion of the power meter 110 according to the present invention and securing the integrity of power metering has been described. Defensive methods against actions) will be intensively explained.

8 is a diagram for explaining a conduction action by a magnet. Referring to FIG. 8, when the magnet 800 is located in a position close to the clip 150 of the CT sensor, an error (distortion) may occur in power measurement using the CT sensor. CT sensor (Current Transformer Sensor) is a secondary current induced by the magnetic force generated in the ferromagnetic core (for example, the clip 150 or the ring 650 of the CT sensor) as an alternating current flows through the connection cable 170. AC current is measured according to the measuring principle. Therefore, when a magnet is placed in the vicinity of the CT sensor as shown in FIG. 8, the current measurement amount may be distorted. As a result, there occurs a case where the amount of power measured by the power meter 110 may be significantly distorted by the magnet.

In order to prevent such distortion, the power meter 110 according to the present invention may include a conduction prevention means to notify the server of the occurrence of an abnormality in the meter when an abnormal current occurs, and may additionally include a means for stopping the metering.

The conduction preventing means according to an embodiment of the present invention may block the connection of the CT sensor when an abnormal current occurs by providing a magnetic force sensor capable of sensing the proximity of the magnet 800.

Here, the magnetic sensor is disposed on one side of the CT sensor to detect magnetism, a magnetic sensing sensor method, a dual CT sensor method, a resonant circuit method, or a method using connectivity wireless communication, and a method using diversity of connectivity wireless communication. And it is possible to detect a challenge attempt due to magnetic force by using at least one of the methods using the dummy load.

First, the magnetic sensing sensor method of FIGS. 9(a) and 9(b) is a method in which the conduction preventing means includes a magnetic force detector 970, a switching device 973, and a disconnection detection circuit 980. At this time, the magnetic force sensor 970 is positioned on one side of the CT sensor. In addition, when a predetermined magnetic field that interferes with the measurement is detected by the magnetic detection sensor 970 by the switching device 973, the detection sensor 970 or the power meter 110 connected to the magnetic detection sensor 970 The CT cable 160-1 connected to the clip 150 of the CT sensor may be blocked.

For example, referring to FIG. 9(a), when the magnetic force sensor 970 finds a predetermined magnetic field that interferes with the measurement, the switching device 973 is opened to disconnect the CT cable 160-1. Then, the disconnection detection circuit 980 detects whether the disconnection occurs. Alternatively, referring to FIG. 9(b), when the magnetic force sensor 970 finds a predetermined magnetic field that interferes with the measurement, it notifies the control unit 426, and the control unit 426 opens the switching device 973 Thus, the CT cable 160-1 is disconnected, and the disconnection detection circuit 980 detects whether the disconnection has occurred.

In this case, the disconnection detection circuit 980 may notify the server 900 or the terminal 200 of the occurrence of an abnormality.

Here, the magnetic detection sensor 970 may use an electric field sensor, magnetic ink (colored sheet), a Hall sensor, an MR sensor, etc., but the sensor is not limited thereto as long as it can recognize the magnet 800.

Referring to FIG. 10, in the dual CT sensor method, the conductive prevention means includes a plurality of CT sensors (clips 150) and a comparator 1020. In this case, basically, since the CT sensor 150 is installed in one connection cable 170, the same magnetic force is induced to be sensed, but when the magnet 800 approaches any one CT sensor 150 There is a difference in the measured current value. Using this difference, the current value measured by the CT sensor 150 is compared, and when the compared difference value exceeds a predetermined value, the server 900 or the terminal 200 may be notified of the occurrence of an abnormality. In addition, it is possible to temporarily shut down the metering or power supply. Meanwhile, in FIG. 10, two CT sensors are shown to be spaced apart from each other, but the number of CT sensors may be three or more.

Referring to FIG. 11, in the dual CT sensor method, the conductive prevention means is a resonance circuit 1110 connected to the CT cable 160-1 of the CT sensor 150, a frequency check circuit 1120, a comparator 1130, and a basic resonance. A frequency generator 1130 may be included.

In this case, when the magnet 800 approaches the CT sensor, the inductance value of the CT sensor changes due to the change in magnetic flux, and the change in frequency may be sensed using a resonance circuit (LC resonance circuit).

Here, the frequency can be generally calculated using Equation 1 below.

(Equation 1)

Here, L denotes inductance, and C denotes capacitance.

That is, when the magnetic flux changes according to the proximity of the magnet 800, the overall inductance of the CT sensor changes, and when the magnetic field of the magnet 800 senses a frequency change of more than a predetermined value, there is a challenge attempt. It is determined that the occurrence of an abnormality may be notified to the server 900 or the terminal 200. In addition, it is possible to temporarily shut down the metering or power supply. In this case, in the present invention, not only a resonator including a resonant circuit is used, but a phase lock loop (PLL) may be used.

Meanwhile, in the present embodiment, it is described that the reference resonance frequency generator 1130 is provided and the reference resonance frequency is compared in hardware, but without the reference resonance frequency generator 1130, a microprocessor provided in the power meter 110 is used. It can also be compared with the reference value in software. In this case, the comparator 1140 may be a software module.

FIG. 12 relates to a method of using a connectivity wireless communication when the power meter is a convergence type power meter. At this time, the conductive prevention means is a connectivity wireless communication (1213, 1215, for example, WiFi, WiSun), a matching circuit (1223, 1225) corresponding to the connectivity wireless communication, a power detection unit 1230, a comparator 1250, and a reference power supply unit ( 1240) may be included.

Connectivity wireless communication inside the power meter may utilize the CT sensor 150 and the CT cable 160-1 as a wireless communication antenna. In this case, the antennas 1211-1 and 1211-2 corresponding to the connectivity wireless communication are preferably formed to have a length of about 3 to 20 cm so as to cover most frequencies.

At this time, after the matching circuit initially matches the antenna based on the maximum power transmission condition suitable for the corresponding frequency, the CT sensor 150 and the CT cable 160-1 will function as an antenna for the internal RF circuit during normal use. I can.

On the other hand, in this case, when the magnet 800 approaches and an impedance change of the sensor occurs, the characteristics of the matching circuit are changed to change the RF transmission power, and the PD (Power Detector) value may change. At this time, if there is a change in the PD value, the proximity of the magnet 800 may be sensed, and an abnormal signal for indicating that there is an abnormality may be transmitted to the mobile terminal 200 or the server 900.

In this embodiment, the PD value is compared in hardware with the reference power Po generated in the circuit of the reference power generator 1240, which is the reference power, and is compared by software using a microprocessor in the power meter 110. It is also possible. In this case, the comparator 1250 may be a software module.

On the other hand, the conductive prevention means may simultaneously utilize a plurality of connectivity wireless communications (WiFi, Wi-Sun) using various frequencies. For example, WiFi uses 2.4GHz, Wi-SUN uses 920MHz, and ISM band for IoT uses 400MHz. As a means of preventing challenge, a plurality of connected wireless communications using different frequencies may be used. When a plurality of connected wireless communications are used simultaneously, for example, when the magnetic force outside the power meter 110 changes with its own frequency, it is possible to prevent more precise challenge through a communication means having various frequencies.

Meanwhile, FIG. 13 relates to a method of using diversity of connectivity wireless communication. In this case, the conductive prevention means includes antennas 1211-1 and 1211-2 connected to two CT cables 160-1, wireless connectivity 1313, matching circuit 1323, antenna switch 1333, and power. A detector 1230 and a comparator 1250 may be included. One CT sensor 150 is usually connected to two CT cables 160-1.

The matching circuit corresponding to the connectivity wireless communication 1313 may be selectively connected to the first antenna 121-1 and the second antenna 1211-2 by the antenna switch 1333. At this time, the power detector 1230 sequentially measures the first power Ptx1 transmitted when connected to the first antenna 1211-1 and the second power Ptx2 transmitted when connected to the second antenna 1211-2. And compare.

In this case, when the magnet 800 approaches and the impedance of the sensor changes, the characteristics of the matching circuit are changed to change the RF transmission power, and the matching value of the matching circuit in each antenna is different depending on the position of the magnet 800. As a result, the values of the first power and the second power are different. Accordingly, when the difference between the first power and the second power is greater than or equal to a predetermined value, the conduction preventing means may transmit an abnormal signal for indicating that there is an abnormality to the mobile terminal 200 or the server 900.

14 shows a conductive prevention means using a dummy load. In this case, the conduction preventing means includes a dummy load 1410, a synchronization circuit 1430, a dummy load switch 1440, and a comparator 1250.

In the method using the dummy load 1410, the synchronization circuit 1430 transmits a synchronization signal to the control unit 426, and the control unit 426 controls the dummy load 1410 to be selectively connected to the connection cable 170. .

In this case, the comparator 1250 compares the current values sequentially measured by the power measurement unit 1260 according to the signal of the synchronization circuit 1430. That is, the first current value when the dummy load 1410 is connected and the second current value when the dummy load 1410 is not connected are compared.

In the method using the dummy load, when the current value is low, for example, a light load time period in which power consumption of the customer is low may be used. At this time, when the customer's power consumption is low, a certain amount of current flows when the dummy load 1410 is connected. On the other hand, when the magnet 800 approaches the CT sensor, the current value measured by the CT sensor exhibits a large difference from the current in the usual light load time period.

Therefore, when the difference between the first current value and the second current value is more than a certain value, the abnormality is detected, and the conduction prevention means may transmit an abnormal signal to inform the mobile terminal 200 or the server 900 that there is an abnormality. .

On the other hand, as shown in Figs. 15 to 17, it is possible to prevent physical conduction by the magnet.

15 and 16, the conduction prevention means may include a spherical conduction prevention case 150-1. The conductive prevention case 150-1 includes a graphite sheet layer 1510, a ferrite sheet layer 1520, and a spherical conductive prevention case housing 1530. In this case, the conduction prevention case 150-1 surrounds the ferromagnetic core 150-2 of the CT sensor.

Accordingly, the CT sensor 150 is not affected by the surrounding magnet 800 by the graphite sheet layer 1510 and the ferrite sheet layer 1520. In this case, the purpose of using the spherical conduction prevention case 150-1 is the effect of the magnetic field on the core (ferromagnetic) of the CT sensor by keeping the outer surface of the CT sensor at a certain distance from the magnetic field of the magnet or by increasing the distance. This is to minimize

On the other hand, even if it is not in a spherical shape, a similar effect can be achieved by maintaining a certain distance from the core (ferromagnetic material) of the CT sensor so that the magnetic field cannot be reached. The important point is to implement an outer shape in which the magnetic field is prevented by expanding the outer surface to the extent that the magnetic field does not reach the core of the CT sensor.

Referring to FIG. 16, the conductive prevention case 150-1 includes a graphite sheet layer 1510, a ferrite sheet layer 1520, and a spherical conductive prevention case housing 1530, and a graphite sheet layer 1510 and a ferrite sheet The layer 1520 further includes a spherical support 1540 to be installed according to the shape of the surface of the spherical conductive prevention case housing.

In this case, since the graphite sheet layer 1510 and the ferrite sheet layer 1520 are provided in a spherical shape, a uniform distance can be secured between the magnet 800 and the ferromagnetic core 150-2, and the magnet 800 is Regardless of the orientation it is placed in, it will be able to better protect the CT sensor physically.

Accordingly, according to the present invention, there is an effect that the power meter 110 installed in the distribution panel 100 can be protected from external intrusion or challenge attempts to ensure the integrity of the measurement of the power meter.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100: distribution panel 110: power meter
111: lower plate 112: upper plate
113: waterproof cap 113-1: cable port on the lower panel
114: terminal cover 114-1: terminal cover sealing hole
114-2: second terminal cover sealing hole 114-3: sealing seal
115: sealing screw 115-1: screw sealing hole
116: LCD display 117: pulse
118: communication reset key 119: product reset key
120: busbar 121: name plate
125: conductor 128: product body sealing part
128-1: Product body sealing cover 128-2: Product body sealing screw
128-3: Product body sealing hole 128-4: Female thread on the lower panel
130: branch circuit breaker 140: parking short circuit
150, 750: CT sensor 150-1: conduction prevention case
160: cable 160-1: CT cable
160-2: serial communication cable 170: connection cable
200: terminal 300: power supply
400: control device 410: insulating waterproof support member
420: printed circuit board 430: connection
440: terminal ground 445: distribution board busbar terminal hole
450: fixing screw 452: female thread
460: waterproof ring 470: waterproof ring holder
500: router 600: home appliance
800: magnet 900: server
970: magnetic detection sensor 973: switching device
980: disconnection detection circuit 1020, 1140, 1250: comparator
1110: resonance circuit 1120: frequency circuit
1130: basic resonant frequency generator
1211-1, 1211-2: antenna
1213, 1215: connectivity wireless communication
1223, 1225, 1323: matching circuit 1230: power detection unit
1240: reference power supply 1260: current measurement
1510: graphite sheet layer 1520: ferrite sheet layer
1530: conductive protection case housing 1540: spherical support

Claims (9)

A printed circuit board including a communication circuit that can be connected to the server through a network, a connection part electrically connected to the busbar of the distribution board, and a power measurement circuit for measuring power;
A power meter housing compatible with the branch circuit breaker of the distribution board and accommodating the printed circuit board;
A busbar terminal grounding unit connected to the connection unit and including a fixing screw groove for fixing the busbar;
An insulating waterproof support member receiving the busbar terminal grounding portion, fixing the busbar terminal grounding portion, and having a fixing screw fastening hole connected to the fixing screw groove;
A waterproof ring supported by the insulating waterproof support member and the support jaws of the power meter housing, and waterproofing the printed circuit board accommodated in the power meter housing; And
A terminal cover coupled to the power meter housing and covering the insulating waterproof support member together with a part of the power meter housing,
When the terminal cover is coupled to the power meter housing, the fixing screw groove and the fixing screw fastening hole are not exposed to the outside, and the terminal cover includes a first terminal cover sealing hole, a second terminal cover sealing hole, and a terminal cover. A sealing screw is included, and the first sealing seal is destroyed when the terminal cover is separated from the power meter housing by passing through the first terminal cover sealing hole, the terminal cover sealing screw sealing hole and the second terminal cover sealing hole. , Power metering device. The product according to claim 1, further comprising a product body sealing part, wherein the product body sealing part includes a product body sealing cover, a product body sealing screw, and a product body sealing hole, and the second sealing seal includes the product body sealing cover. A power metering device that is destroyed when the lower plate and the upper plate of the power meter housing are separated by passing through the product body sealing hole and the product body sealing screw sealing hole in a state of being coupled with the meter housing. The power metering apparatus according to claim 1, wherein the insulating waterproofing support member is fixed by a busbar terminal fixing screw, and the terminal cover prevents the busbar terminal fixing screw from being exposed when it is combined with the power meter housing. The method of claim 3, wherein the busbar terminal fixing screw includes a female threaded portion on the head of the busbar terminal fixing screw, and the terminal cover sealing screw is coupled to the female threaded portion when the terminal cover is coupled to the power meter housing. Being, power metering device. The external device of claim 1, wherein the communication circuit comprises a wired communication means and a wireless communication means, and the wired communication means is an external device by a wired communication cable passing through a waterproof cap sealing a cable hole provided in the power meter housing. Connected to the power metering device. The method of claim 5, further comprising a CT sensor measuring current, wherein the CT sensor is installed on a connection cable connecting the busbar and the parking terminal of the distribution board, and the printing is performed by a CT cable passing through the waterproof cap. A power metering device connected to a circuit board. The method of claim 6,
The CT sensor is formed in any one of a ring shape and a clip shape,
Power metering device. The power metering apparatus according to claim 6, wherein the CT sensor includes a conductive prevention case, and the conductive prevention case includes a graphite sheet layer, a ferrite sheet layer, and a spherical conductive prevention case housing. The method of claim 8, wherein the conduction prevention case surrounds the ferromagnetic core of the CT sensor, and the conduction prevention case includes the graphite sheet layer and the ferrite sheet layer installed according to the shape of the surface of the spherical conduction prevention case housing. The power metering device further comprising a spherical support to enable.

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