KR102075401B1 - A Method For Sealing A Power Meter And Preventing An Illegal Use Of Electricity - Google Patents

Abstract

The present invention relates to a power meter system capable of preventing an illegal use of electricity. The power meter system comprises: a printed circuit board including a communication circuit which can be connected with a server through a network, a connection portion which is electrically connected with a busbar of a distribution panel, and a power measurement circuit which measures power; a power meter housing compatible with a branch circuit breaker of the distribution panel and accommodating the printed circuit board; a busbar terminal ground portion connected to the connection portion and including a fixing screw groove fixing the busbar; an insulating waterproof support member accommodating the busbar terminal ground portion and having a fixing screw fastening hole which fixes the busbar terminal ground portion and is connected with the fixing screw groove; a waterproof ring supported by the insulating waterproof support member and a support protrusion of the power meter housing and waterproofing the printed circuit board accommodated in the power meter housing; a terminal cover coupled to the power meter housing and covering the insulation waterproof support member together with a portion of the power meter housing; a first CT sensor; and an electricity theft prevention means sensing whether a predetermined amount or more of a magnetic field other than a magnetic field induced by the CT sensor in a connection cable connecting the busbar and a primary circuit breaker of the branch circuit breaker is present in the CT sensor.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing and conducting electricity of a power meter, and more particularly, to a method of sealing and conducting electricity of a power meter which can improve durability and waterproofness by sealing precisely.

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

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

However, in order to use such a power measuring device as a power meter for billing electricity, it is necessary to exclude the possibility of unauthorized intrusion to extract power usage. That is, sealing means (anti-sealing means) and anti-conduction techniques should be applied so that an unauthorized power measuring device may be removed after installation or an element affecting unauthorized power usage measurement may be excluded. Exclusion of the possibility of intrusion using such sealing means is a legal requirement.

However, recently developed power measuring device using a network does not have such a sealing means, it is difficult to use as a meter for the calculation of billing, but a network-based power meter is urgently needed 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 the power meter installed in the distribution panel.

Another object of the present invention is to provide a power meter with improved durability and waterproofness when sealed.

In order to solve the problems as described above, the electric power metering system capable of preventing electricity 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 panel, and a power for measuring power. A printed circuit board including a measurement circuit; A power meter housing compatible with the branch circuit breaker of the distribution panel and accommodating the printed circuit board; A busbar terminal grounding part connected to the connection part and including a fixing screw groove for fixing the busbar; An insulating waterproof support member accommodating 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 jaw of the power meter housing and waterproofing the printed circuit board accommodated in the power meter housing; A terminal cover coupled to the power meter housing and covering the insulating waterproof support member together with a portion of the power meter housing; A first CT sensor; And an anti-conduction means for sensing whether a magnetic field other than the magnetic field induced in the first CT sensor is present in the first CT sensor by a connection cable connecting the bus bar and the parking interrupter of the branch breaker. have.

In this case, the conductive sensing means may include a magnetic force detector, a switching device, and a disconnection detection circuit disposed on one side of the CT sensor to sense magnetism.

In addition, the conduction detecting means controls the switching device when the magnetic force detector detects whether a magnetic field other than the magnetic field induced by the CT sensor in the connection cable is present in the CT sensor by a predetermined value or more, thereby controlling the first CT. The CT cable connecting the sensor and the printed circuit board may be blocked.

Further, when the switching device cuts off the CT cable, the disconnection detection circuit detects the disconnection of the CT cable and transmits an abnormality to an external server or an external terminal.

 Meanwhile, the anti-conduction means includes a second CT sensor and a comparator, and the anti-conduction means compares the current detected by the first CT sensor with the current detected by the second CT sensor, and the difference is predetermined. If the value is exceeded, an error may be transmitted to the external server or the external terminal.

Alternatively, the anti-conduction means may include a resonant circuit, a frequency check circuit, and a comparator connected to a CT cable connecting the first CT sensor and the printed circuit board.

In this case, the resonant circuit senses the change of the resonant frequency that is changed due to the change of the magnetic flux outside the first CT sensor, the frequency check circuit inputs the sensed frequency to the comparator, and the comparator receives the sensed frequency By comparing with the reference frequency and if the difference is more than a predetermined value it can be transmitted to the external server or an external terminal.

Alternatively, the printed circuit board includes a wireless communication means, wherein the anti-conduction means includes a matching circuit corresponding to the wireless communication means, an antenna cable connected to the first CT sensor and the matching circuit, and a power connected to the matching circuit. It includes a detector (PD) and a comparator, and compares the power detected by the power detector and the reference power can be transmitted to the external server or an external terminal in the case of a difference or more than a predetermined value.

In this case, the wireless communication means may include a wireless communication means using a plurality of different frequencies.

In addition, the wireless communication means using the plurality of different frequencies may include WiFi, Wi-Sun.

Or the printed circuit board includes a wireless communication means, wherein the anti-conduction means includes a matching circuit corresponding to the wireless communication means, first and second antenna cables selectively connected to the first CT sensor and the matching circuit, And a power detector (PD) and a comparator connected to the matching circuit, wherein the anti-conducting means is connected to the first power detected by the power detector and the second antenna cable when connected to the first antenna cable. The second power detected by the power detector may be compared, and if there is a difference of a predetermined value or more, the presence or absence of an abnormality may be transmitted to an external server or an external terminal.

Alternatively, the printed circuit board includes a control unit, wherein the anti-conduction means includes a dummy load, a synchronization circuit, a dummy load switch and a comparator, the synchronization circuit transmits a synchronization signal to the control unit, and the control unit may include a dummy load. The control unit is connected to the connection cable, and the comparator compares a first current value when the dummy load is connected with a second current value when the dummy load is not connected according to the signal of the synchronization circuit. The anti-conduction means may transmit the abnormal signal to the mobile terminal or the server when the difference between the first current value and the second current value is greater than or equal to a certain level.

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 the measurement distortion caused by external conduction by improving the anti-conducting structure 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 panel 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.
Figure 4a is an exploded perspective view for explaining a waterproof structure of the 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 the 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 panel according to an embodiment of the present invention.
FIG. 9 is a view for explaining a power meter including an anti-conduction means including a magnetic field recognition sensor according to an exemplary 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 conduction 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 conduction prevention means using a wireless communication means according to an embodiment of the present invention.
FIG. 13 is a view for explaining a power meter including 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 diagrams for describing a power meter including a spherical anti-conductive case according to an embodiment of the present invention.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art, although not explicitly described or illustrated herein, can embody the principles of the invention and invent various devices included in the concept and scope of the invention. In addition, all conditional terms and embodiments listed herein are in principle clearly intended to be understood only for the purpose of understanding the concept of the invention and are not to be limited to the specifically listed embodiments and states. do.

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

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby the technical spirit of the invention may be easily implemented by those skilled in the art. .

Each of the features of the various embodiments of the present invention may be combined or combined with each other, partly or wholly, and various technically interlocking and driving are possible as one skilled in the art can fully understand, and each of the embodiments may be independently implemented with respect to each other. It may be possible to carry out together in an association.

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

First, a distribution panel that 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 panel 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 panel 100. Preferably, the power meter 110 according to the present invention may be connected to a router or a home gateway in order to transmit data measured from the distribution panel 100 to the server 900 through a network, and may be connected to an external network such as the Internet.

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

In more detail, the parking terminal 140 is installed inside the distribution panel 100 to perform a function of blocking the total power.

The branch circuit breaker 130 is configured to cut off electric power for each home appliance 600 that is installed inside the distribution panel 100 and electrically connected to the distribution panel 100, and the plurality of branch circuit breakers 130 are the busbars 120 of the distribution panel 100. It is fixed to).

The busbar 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 each branch circuit breaker 130 and the power input terminal of the power meter 110 according to the present invention. . In other words, the busbar 120 is connected through the power input terminal and the busbar 120 fixed end of the branch circuit breaker 130 installed in a predesigned position.

The power meter 110 measures the power usage of all devices that are supplied with power through the distribution panel such as the home appliance 600, and transmits the measured data to the server 900 through the network. The power meter 110 is fixed to the bus bar 120 installed in the distribution panel 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 for the detailed configuration of the power meter 110 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 the CT cable to measure the current, but it is advantageous to fix it in the distribution panel due to the limitation of the wire length, but the internal spaces may be different from each distribution panel. If the free space in the distribution panel is not secured, installation may not be possible due to the limitation of the installation space.

In addition, when installing the power measuring device inside the distribution panel, due to the limitation of the allowable space, in all cases it is impossible to fit the wireless antenna 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 reduced.

Therefore, since 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 to solve the above-mentioned problems, the power meter panel board eliminates inconvenience of product installation. It can be tightened easily.

Meanwhile, the server 900 may receive measurement data from the power meter 110 and analyze and store the power usage and power usage pattern of the customer based on the received measurement data. In addition, the power of the devices connected to the power meter 110 may be analyzed as the power of each device through non-intrusive load monitoring (NILM). Alternatively, based on the power analysis of the devices, the home appliance 600 connected to the power meter 110 may be controlled respectively, or a power saving guide for power consumption of each device may be generated and transmitted.

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 for describing an internal structure of a power meter according to an embodiment of the present invention. Figure 4b is an exploded perspective view for explaining the overall waterproof structure of the power meter according to an embodiment of the present invention.

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

The insulation waterproof support member 410 is a structure that performs insulation and waterproof functions when power is drawn from the distribution panel 100 to the power meter 110. The distribution board 100 may seal and fix the busbars 120 of the distribution panel 100. Terminal ground portion 440 of the 100, bus bar terminal fixing screw 450 and the waterproof ring (O ring) guide 470 is included.

As shown in FIG. 4A, the insulating waterproof support member 410 is disposed above the connection part 430 through two connection parts 430 on the printed circuit board 420 to prevent water from entering the connection part 430. 460 can be mounted in place. In addition, a distribution board busbar terminal hole 445 is formed on an upper surface of the insulation waterproof support member 410, and a conductive wire 125 connected to a branch or a busbar of the busbar of the distribution board is formed on the front surface of the insulation waterproof support member 410. Two fixing screw fastening holes 443 may be formed to fasten the busbar terminal fixing screw 450 to be fastened to the ground portion 440.

Therefore, the power drawn through the busbar 120 is applied to the power meter 110 through the terminal ground portion 440 and the connection portion 430, the power meter collects a variety of power information of the customer, such as voltage through this. can do.

Specifically, the busbar terminal grounding part 440 is accommodated in the insulating waterproof supporting member 410 while being inserted into the distribution board busbar terminal hole 445 of the upper surface of the insulating waterproof supporting member 410. At this time, the waterproof ring holder 470 of the insulating waterproof support member 410 mounts the waterproof ring 460 in place and is in airtight contact with the waterproof ring 460 when installed. Therefore, when water is to be introduced from the top or side, the waterproof ring 460 and the waterproof ring holder 470 can prevent the 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 coupled to each other. Since the waterproof ring holder 470 is disposed on the insulating waterproof supporting member 440 inevitably requires a hole for sealing in the terminal cover, insulated waterproof to prevent water flowing through the sealing hole of the terminal cover. A waterproof ring holder 470 was 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 controller 426 implemented as a microprocessor or the like. In this case, the wired communication means 427 may be used to connect with an external monitoring means (not shown) by wire, and the wireless communication means 423 may be used when connecting with an external monitoring means (not shown) or the server 900. . On the other hand, the antenna means 425 is preferably an antenna having a directivity in the direction of the name plate 121, and because of the fixed directivity can increase the reception sensitivity of the wireless communication means 423.

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

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 top surface to be fastened with the busbar 120 of the distribution panel 100, and supports the printed circuit board 420, the waterproof ring 460, and the upper plate 112. It is a support for

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

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 power meter 110. . The waterproof ring 460 is disposed to correspond to the edge of the printed circuit board 420 from the lower surface of the waterproof structure, as shown in FIG. 4B.

The top plate 112 may be arranged in various configurations for operating the power meter 110. For example, LCD display 116, communication (Wi-Fi) reset key 118, product reset key 119, CT cable 160-1, name plate 121 (specify specification), 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 the power meter according to an embodiment of the present invention.

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

Referring to FIGS. 5A and 5B, 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, Figure 5 (b) includes a female screw portion 452 that can be combined with the terminal cover sealing screw 115 inside the head of the distribution panel fixing screw 450, the terminal cover sealing screw 115 and the distribution panel fixed When the screws 115 are coupled to each other, the terminal cover 114 may be fixed to the power meter 110 while simultaneously fixing the power meter 110 to the distribution panel 100. 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 FIG. 3, the sealing seal 114-3 passes through the first terminal cover sealing hole 114-1 and the screw sealing hole 115-1 again to the second terminal cover sealing hole 114-2. Passes through to seal the terminals of the power meter 110. At this time, the terminal cover 114 is fixed screw groove and when combined with the power meter housing and

The fixing screw fastening hole 443 of the insulating waterproof supporting member is not exposed to the outside. Therefore, when the terminal cover 114 is separated from the power meter 110, the sealing seal 114-3 is broken. Here, the term "destructive" includes all cases in which at least a part of the seal seal (including a thread-like portion extending from the seal seal) is broken, and when the seal seal is broken, external invasion of the power meter 110 has occurred. May be considered.

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

In this case, the terminal cover 114 may be different in size depending on the presence and type of the distribution board fixing screw 450 as shown in Figure 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 can 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 thread portion 128-4 (refer to FIG. 4B) of the lower plate of the power meter 110, so as to prevent intrusion from the outside of the product at the source. It can be sealed in the middle.

Even in this case, the product body seal 128 may be sealed by a separate seal seal in the same manner as the terminal cover seal, and may be considered to have been externally invaded by the power meter 110 when broken.

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 of the distribution panel 100. There is an effect that can be sealed confidential 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, the CT sensor 150 is described as being formed in a clip form as shown in FIG. 6, but may be formed in a ring form as shown in FIG. 7.

Clip portion 150, 650 of the CT sensor is in the form of a clip or ring, the clip portion 150, 650 of the CT sensor is coupled to the connection cable 170 of the parking terminal 140 and the busbar 120, In particular, the clip-shaped clip portion 150 includes an upper portion having an 'n' shape to facilitate installation in the connection cable 170. Clips 150 and 650 of the CT sensor are connected to the CT cable 160-1 and the serial communication cable 160-2, and are printed through the waterproof cap 113 disposed at the lower side of the power meter 110. It may be connected to the circuit board 420. The waterproof cap 113 can hermetically block the cable port 113-1 of the lower plate. Thus, when the CT sensor 750 is formed in a ring shape, the present invention can effectively utilize space.

On the other hand, it has been described how to prevent the physical external intrusion of the power meter 110 according to the present invention, and to ensure the integrity of the power meter, the following is a challenge (to distort the integrity of the meter by distorting the power measurement value) Focus on how to defend against behavior.

8 is a diagram for explaining a conducting behavior by a magnet. Referring to FIG. 8, when the magnet 800 is located near the clip 150 of the CT sensor, an error (distortion) may occur in power measurement using the CT sensor. The CT transformer (Current Transformer Sensor) is a secondary current induced by the magnetic force generated in the ferromagnetic core (for example, the clip 150 or ring 650 of the CT sensor) as an alternating current flows through the connection cable 170 AC current is measured according to the principle of measurement. Therefore, when the magnet is placed near the CT sensor as shown in FIG. 8, the current measurement amount may be distorted. As a result, 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 be provided with a conduction prevention means to inform the server of occurrence of a meter abnormality when an abnormal current occurs, and may further include a means for stopping the metering.

Anti-conduction means according to an embodiment of the present invention, by providing a magnetic sensor that can sense the proximity of the magnet 800 can block the connection of the CT sensor when the abnormal current occurs.

Here, the magnetic force detector is disposed on one side of the CT sensor to detect the magnetic sensor, dual CT sensor, resonant circuit method or the method using the wireless communication, the method of using the diversity (wireless diversity) of wireless communication And a challenge attempt by magnetic force may be sensed using at least one of the methods using the dummy load.

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

For example, referring to FIG. 9A, when the magnetic force detector 970 finds a predetermined magnetic field that interferes with the measurement, the switching device 973 is opened to disconnect the CT cable 160-1. The disconnection detection circuit 980 detects whether a disconnection occurs. Alternatively, referring to FIG. 9B, when the magnetic force detector 970 finds a predetermined magnetic field that interferes with the measurement, the controller 426 is notified, and the controller 426 opens the switching device 973. Thus, the CT cable 160-1 is disconnected, and the disconnection detecting circuit 980 detects disconnection.

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

The magnetic sensor 970 may use an electric field sensor, a magnetic ink (color sheet), a hall sensor, an MR sensor, or the like, but the magnetic sensor 970 is not limited thereto.

Referring to FIG. 10, in the dual CT sensor method, the anti-conductive means includes a plurality of CT sensors (clips 150) and a comparator 1020. In this case, since the CT sensor 150 is basically installed in one connection cable 170, the same magnetic force must be induced and sensed, but the magnet 800 is close to any one CT sensor 150. The difference between the measured current values is shown. By using the 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 an abnormality occurrence. In addition, the meter or power supply may be temporarily switched off. Meanwhile, in FIG. 10, two CT sensors are 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, a resonant circuit 1110, a frequency check circuit 1120, a comparator 1130, and a basic resonance, in which a conduction prevention means is connected to the CT cable 160-1 of the CT sensor 150, are described. It may include a frequency generator 1130.

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

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

(Equation 1)

Where L is inductance and C is capacitance.

That is, when the magnetic flux changes in accordance with the proximity of the magnet 800, a change occurs in the inductance of the CT sensor as a whole, and when a magnetic field of the magnet 800 senses and a frequency change of more than a predetermined value occurs, there is a challenge. In response to the determination, the server 900 or the terminal 200 may be notified of the occurrence of an abnormality. In addition, the meter or power supply may be temporarily switched off. In this case, the present invention may be used by transforming not only a resonator including a resonant circuit but also a phase lock loop (PLL).

In the present exemplary embodiment, the reference resonance frequency generator 1130 is provided and compared with the reference resonance frequency in hardware. However, the microprocessor provided in the power meter 110 without the reference resonance frequency generator 1130 may be used. You can also compare the reference value with software. In this case, the comparator 1140 may be a software module.

FIG. 12 relates to a manner of using connectivity wireless communication when the power meter is a fusion type electricity meter. In this case, the anti-conduction means includes the connection wireless communication 1213 and 1215 (eg, WiFi and WiSun), the matching circuits 1223 and 1225 corresponding to the connection wireless communication, the power detector 1230, the comparator 1250 and the reference power supply unit ( 1240).

The connected wireless communication inside the power meter may utilize the CT sensor 150 and the CT cable 160-1 as a wireless communication antenna. At this time, it is preferable that the antennas 1211-1 and 1211-2 corresponding to the connected wireless communication are formed to have a length of about 3 to 20 cm so as to cover most frequencies.

In this case, after the matching circuit initially matches the antennas based on the maximum power transmission condition for the corresponding frequency, the CT sensor 150 and the CT cable 160-1 may serve as antennas of the internal RF circuit during normal use. Can be.

In this case, when the magnet 800 approaches and a change in the impedance of the sensor occurs, the matching circuit characteristic is changed to change the RF transmission power and the PD (power detector) value may be changed. In this case, when there is a change in the PD value, the proximity of the magnet 800 may be detected, and an abnormal signal for notifying that there is an abnormality may be transmitted to the mobile terminal 200 or the server 900.

In the present 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. The PD value is compared in software using a microprocessor in the power meter 110. It is also possible. In this case, the comparator 1250 may be a software module.

Meanwhile, the anti-conduction means may simultaneously use a plurality of connected wireless communication (WiFi, Wi-Sun) using various frequencies. For example, WiFi uses 2.4 GHz, Wi-SUN uses 920 MHz, and the ISM band for IoT uses 400 MHz, while the anti-challenge means may utilize a plurality of connected wireless communication using different frequencies. By utilizing a plurality of wireless communication at the same time, for example, when the magnetic force outside the power meter 110 changes with its own frequency, it is possible to prevent more precise conduction through communication means having various frequencies.

Meanwhile, FIG. 13 relates to a method of using diversity of connected wireless communication. In this case, the anti-conduction means includes the antennas 1211-1 and 1211-2 connected to the two CT cables 160-1, the wireless communication communication 1313, the matching circuit 1323, the antenna switch 1333, and the power. The detector 1230 and the comparator 1250 may be included. One CT sensor 150 is typically 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 1211-1 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 1121-1 and the second power Ptx2 transmitted when connected to the second antenna 1211-2. To compare.

In this case, when the magnet 800 approaches and a change in the impedance of the sensor occurs, the matching circuit characteristic is changed to change the RF transmission power, and the matching value of the matching circuit at each antenna varies according to the position of the magnet 800. As a result, the values of the first power and the second power are changed. Therefore, when the difference between the first power and the second power is greater than or equal to a predetermined value, the anti-conduction means may transmit an abnormal signal for notifying that there is an abnormality to the mobile terminal 200 or the server 900.

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

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

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

The method using the dummy load may use a low load time when the current value is low, for example, a low power consumption of the consumer. At this time, when the power consumption of the consumer 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 is significantly different from the current in the light load time zone.

Therefore, when the difference between the first current value and the second current value is greater than or equal to a predetermined value, the abnormality detection means may transmit an abnormal signal for notifying that there is an abnormality to the mobile terminal 200 or the server 900. .

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

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

Accordingly, the CT sensor 150 is not affected by the magnets 800 around the graphite sheet layer 1510 and the ferrite sheet layer 1520. In this case, the purpose of using the spherical anti-conductive case 150-1 is to maintain the constant distance from the magnetic field of the magnet or increase the distance of the outer surface of the CT sensor, the effect of the magnetic field on the core (ferromagnetic material) of the CT sensor To minimize this.

On the other hand, even if not in the form of a spherical shape, ellipse, spiral shape and the like so as not to reach the magnetic field by maintaining a certain distance from the core (ferromagnetic material) of the CT sensor. The important point is to extend the outer surface to the extent that the magnetic field does not reach the core of the CT sensor to implement the outer shape so that the magnetic field does not reach.

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

In this case, since the graphite sheet layer 1510 and the ferrite sheet layer 1520 are installed in a spherical shape, a uniform distance between the magnet 800 and the ferromagnetic core 150-2 may be ensured, and the magnet 800 may be Regardless of the direction in which they are placed, physical protection of the CT sensor will be better.

Therefore, according to the present invention, the power meter 110 installed in the distribution panel 100 can be protected from external intrusion or challenge attempt to secure 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 can be made without departing from the spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, 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 exemplary in all respects and not restrictive. 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 construed as being included in the scope of the present invention.

100: distribution panel 110: power meter
111: bottom plate 112: top plate
113: waterproof cap 113-1: lower cable
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 portion
128-1: Product Body Seal Cover 128-2: Product Body Seal Screw
128-3: product body sealing hole 128-4: female threaded portion of the lower plate
130: branch breaker 140: parking breaker
150, 750: CT sensor 150-1: anti-conductive 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: connecting portion
440: terminal ground portion 445: distribution panel 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 sensing sensor 973: switching device
980: disconnection detection circuit 1020, 1140, 1250: comparator
1110: resonant circuit 1120: frequency circuit
1130: basic resonant frequency generator
1211-1, 1211-2: Antenna
1213, 1215: Connectivity Wireless Communications
1223, 1225, and 1323: matching circuit 1230: power detector
1240: reference power supply 1260: current measurement
1510: graphite sheet layer 1520: ferrite sheet layer
1530: anti-conductive case housing 1540: spherical support

Claims (12)

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 panel, and a power measurement circuit measuring power;
A power meter housing compatible with the branch circuit breaker of the distribution panel and accommodating the printed circuit board;
A busbar terminal grounding part connected to the connection part and including a fixing screw groove for fixing the busbar;
An insulation waterproof support member configured to receive the busbar terminal grounding portion, fix the busbar terminal grounding portion, and have a fixing screw fastening hole connected to the fixing screw groove;
A waterproof ring supported by the insulating waterproof support member and the support jaw of the power meter housing and waterproofing the printed circuit board accommodated in the power meter housing;
A terminal cover coupled to the power meter housing and covering the insulating waterproof support member together with a portion of the power meter housing;
A first CT sensor; And
And conductive prevention means for sensing whether a magnetic field other than the magnetic field induced in the first CT sensor is present in the first CT sensor by a connection cable connecting the bus bar and the parking terminal of the branch breaker. Metering device. The power metering device of claim 1, wherein the anti-conduction means includes a magnetic force detector, a switching device, and a disconnection detection circuit disposed on one side of the first CT sensor to sense magnetism. The switching method of claim 2, wherein the anti-conduction means detects whether the magnetic force detector detects that a magnetic field other than the magnetic field induced by the first CT sensor in the connection cable is present in the first CT sensor. And control the device to block the CT cable connecting the first CT sensor and the printed circuit board. The power metering device according to claim 3, wherein when the switching device cuts off the CT cable, the disconnection detection circuit detects the disconnection of the CT cable and transmits an abnormality to an external server or an external terminal. The method of claim 1, wherein the anti-conduction means includes a second CT sensor and a comparator, and the anti-conduction means compares the current detected by the first CT sensor with the current detected by the second CT sensor. When the difference exceeds a predetermined value, and transmits whether or not abnormality to the external server or the external terminal. The power metering device of claim 1, wherein the anti-conduction means includes a resonant circuit, a frequency check circuit, and a comparator connected to a CT cable connecting the first CT sensor and the printed circuit board. The apparatus of claim 6, wherein the resonant circuit senses a change in resonant frequency that is changed due to a change in magnetic flux outside the first CT sensor, the frequency check circuit inputs the sensed frequency to the comparator, and the comparator And comparing the sensed frequency with a reference frequency and transmitting the presence or absence of an abnormality to an external server or an external terminal when the difference is greater than or equal to a predetermined value. The printed circuit board of claim 1, wherein the printed circuit board includes wireless communication means, and the anti-conduction means includes: a matching circuit corresponding to the wireless communication means, an antenna cable connected to the first CT sensor, and the matching circuit, and the matching circuit. A power detector (PD) and a comparator connected to the circuit, and compares the power detected by the power detector with a reference power, and transmits an abnormality to an external server or an external terminal when there is a difference over a predetermined value. Device. 9. The power metering device of claim 8, wherein the wireless communication means comprises wireless communication means using a plurality of different frequencies. 10. The power meter of claim 9, wherein the wireless communication means using the plurality of different frequencies comprises WiFi, Wi-Sun. The printed circuit board of claim 1, wherein the printed circuit board includes wireless communication means, and the anti-conduction means includes: a first circuit selectively connected to a matching circuit corresponding to the wireless communication means, the first CT sensor, and the matching circuit; A second antenna cable, a power detector (PD) and a comparator connected to the matching circuit;
The anti-conducting means compares the first power detected by the power detector when connected to the first antenna cable and the second power detected by the power detector when connected to the second antenna cable to determine a difference of a predetermined value or more. If there is an abnormality is transmitted to the external server or an external terminal, the power metering device. The printed circuit board of claim 1, wherein the printed circuit board includes a controller, and the anti-conduction means includes a dummy load, a synchronous circuit, a dummy load switch, and a comparator.
The synchronization circuit transmits a synchronization signal to the control unit, the control unit controls the dummy load to be selectively connected to the connection cable,
The comparator compares a first current value when the dummy load is connected with a second current value when the dummy load is not connected according to the signal of the synchronization circuit,
And the conduction preventing means transmits an abnormal signal to a mobile terminal or a server when the difference between the first current value and the second current value is equal to or greater than a predetermined value.

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