JP2018526638A - Single-phase multiple circuit measuring device - Google Patents

Abstract

The single-phase multiple circuit measurement device 100 according to the present invention calculates power using current data derived from a current signal generated by a built-in penetration type CT and voltage data received from a communication module. A single-phase multi-circuit measuring apparatus 100 that measures all of a plurality of adjacent single-phase circuits 4 as a single apparatus, and includes two power lines at the ends of the power lines constituting the adjacent single-phase circuits. The power line 4S is configured to penetrate the remaining power line 4M without penetrating, and corresponds to at least one power line for each single-phase circuit in the penetrating power line 4M. Each type of CT is installed.

Description

  The present invention relates to a single-phase multiple circuit measurement device, and more particularly, to a measurement device that measures current and power flowing in a large number of arranged single-phase circuits, and a measurement system using the measurement device.

  In a distribution board, in order to measure not only the main main line but also each branch circuit that branches out, a CT (Current Transformer) is usually installed for each branch circuit, and the signal line from each CT is connected to the center. Connect to the main measuring device. In this main measuring device, the main line and each branch line are measured using the current signal sensed by each CT and the common voltage signal sensed at one fulcrum.

  However, since such a system has to route each analog signal line from each branch circuit to the main measuring device, there are problems of excessive installation man-hours, safety problems due to the fact that many signal lines are mixed with power lines, and With calibration problem for CT.

  A method for solving such a problem is described in Korean Patent No. 1469448 ("Multi-line power measurement system that increases efficiency and simplicity") by the present applicant. In this patent, for each branch circuit, for example, a branch circuit measurement device ('current measurement device') is installed on the side of the MCCB, and the main measurement device ('voltage measurement device') senses a common voltage at one fulcrum. Then, voltage data obtained by analog / digital conversion of the sensed voltage signal is generated. Then, the main measurement device provides voltage data to each branch circuit measurement device using serial communication.In each branch circuit measurement device, current data obtained by analog / digital conversion of the current signal sensed itself, The power is calculated using the transmitted voltage data.

  According to the technology of the aforementioned patent No. 1469448, the current signal sensed by the CT built in each branch circuit measuring device is immediately used together with the voltage data transmitted by analog / digital conversion. There is no problem to pull in the analog signal line from the main measuring device to the main measuring device, and it is only necessary to connect the main measuring device and all the branch circuit measuring devices using a single serial communication line, so a large number of signal lines are arranged. The conventional problems are eliminated. As a result, there is an advantage of solving the problem of excessive installation man-hours and the safety problem caused by the mixture of the power line and the signal line. As a result, the CT can be calibrated at the production stage and stored separately in the branch circuit measurement device. Therefore, there is an advantage that the CT need not be calibrated at the installation stage.

  By the way, in order to configure a measurement system according to the above-described patented technology, a branch circuit measuring device should be installed for each branch circuit, and the number of branch circuits is from a few tens to a hundred. If there are many, there is a problem that a lot of cost is required to construct a measurement system.

  FIG. 1 is a perspective view illustrating an example in which a branch circuit measuring device is installed on a distribution board according to a patent technique registered by the present applicant (the main measuring device and serial communication lines are omitted). ).

  As shown in the figure, the main line power drawn through the main MCCB 1 is branched to each branch circuit using a bus bar, and a branch circuit MCCB (Molded Case Circuit Breaker) 2 is installed for each branch circuit. One branch circuit measuring device 3 is installed on each side of the branch circuit MCCB 2. The branch circuit penetrates the branch circuit measuring device 3. For example, when the branch circuit is a single-phase circuit, two power lines are penetrated.

  By the way, the branch circuit measurement device 3 should be installed for each branch circuit. As shown in the figure, when there are 18 branch circuits, each of the 18 branch circuit measurement devices 3 must be installed. Don't be.

  Normally, the adjacent branch circuit MCCBs 2 are arranged in close contact with each other, and accordingly, the adjacent branch circuit measuring devices 3 can only be arranged in close contact with each other. Since there is no space between the adjacent branch circuit measurement devices 3, it is necessary to produce a branch circuit measurement device 3 that is accurately matched to the size of the branch circuit MCCB 2, and to attach a separate mounting base plate first. After mounting, there is a problem that a method such as sliding to the side and joining must be used. Normally, the measurement system based on the above-described patented technology is often installed in addition to a distribution board already in operation, but in such a case, the above problems can be weighted. Since the adjacent branch circuit measurement devices 3 are in close contact with each other, the side face facing the adjacent branch circuit measurement device 3 cannot be used in forming the input / output port of the branch circuit measurement device 3.

  On the other hand, in distribution boards such as distribution boards for data center servers, a large number of single-phase circuits with the same current rating are arranged and installed (from several tens to a hundred feeders). It is possible to pursue efficiency in the configuration of the branch circuit measuring device 3 by utilizing the point that the single-phase circuits are arranged in an array.

  The recognition of the problems and problems of the prior art described above is not obvious to those who have ordinary knowledge in the technical field of the present invention (a person skilled in the art). Therefore, the present invention is compared with the prior art based on such recognition. It should be clarified that the inventive step should not be judged.

Korean registered patent No. 1469448

  An object of the present invention is to provide a measuring device capable of improving the efficiency in the configuration of a branch circuit measuring system using a distribution board or the like on which a large number of single-phase circuits are arranged.

  The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be obtained from the following description based on the general knowledge in the technical field to which the present invention belongs. It should be clear to those who have it (one skilled in the art).

  A single-phase multiple circuit measurement device according to an aspect of the present invention includes a housing having a plurality of through holes (holes) through which power lines constituting a plurality of adjacent single-phase circuits are penetrated, and built in the housing, A plurality of CTs installed around the through-holes for sensing currents flowing through the plurality of single-phase circuits, respectively. The plurality of through-holes provided in the housing are adjacent to each other. Among the power lines constituting the plurality of single-phase circuits, the two power lines at both ends are not penetrated, and the remaining power lines are penetrated.

  The single-phase multi-circuit measuring apparatus according to one aspect of the present invention includes the remaining four power lines penetrating each of the six power lines constituting the three adjacent single-phase circuits, excluding the two power lines at both ends. A housing having four through-holes, and a plurality of CTs built around the through-holes to sense currents flowing through the three single-phase circuits, respectively, The two power lines at both ends do not penetrate through holes provided in the housing.

  In the single-phase multiple circuit measuring apparatus described above, the CT is installed around the remaining through holes except for the second or third through hole among the four through holes.

  In the above-described single-phase multiple circuit measurement device, the current sensed from one of the plurality of CTs, or the current sensed from all the remaining ones excluding one of the plurality of CTs has a phase. Inverted and used for power calculation.

  In the single-phase multiple circuit measuring device described above, all the electric power is calculated for each single-phase circuit by using at least current data derived from the current signals generated in the plurality of CTs and built in the housing. Including a single processor.

  The above single-phase multiple circuit measurement device includes a single communication module that is built in the housing and transmits at least current data derived from current signals generated by the plurality of CTs. To do.

  In the single-phase multiple circuit measurement device described above, voltage data derived from a voltage signal that is built in the housing and has the same voltage as the single-phase circuit but is sensed at another fulcrum is received from the main measurement device. Communication module, current data derived from current signals generated by the plurality of CTs, and voltage data received from the communication module at least for each single-phase circuit. A single processor for calculating all power and generating power data, and transmitting the generated power data to the main measuring device using the communication module.

  In the above-described single-phase multi-circuit measurement device, a mounting tap that is coupled to each of two side surfaces through which the power line does not penetrate among the four side surfaces of the housing in order to fix the housing to the base. Characterized by being composed.

  In the above-described single-phase multiple circuit measuring device, the housing includes an upper housing and a lower housing.

  A single-phase multiple circuit measurement device according to an aspect of the present invention calculates power using current data derived from a current signal generated by a built-in through CT and voltage data received from a communication module. Is a single-phase multi-circuit measurement device that measures all of a plurality of adjacent single-phase circuits as a single device, and in the power lines that constitute the plurality of adjacent single-phase circuits, The power line is configured so that the remaining power line is penetrated without penetrating, and corresponding to at least one power line for each single-phase circuit among the penetrating power lines. Are each installed.

  The above-described single-phase multi-circuit measuring apparatus is characterized in that it is applied to a distribution board in which a single-phase circuit branched from a main lead-in line, particularly a single-phase circuit having the same capacity, is arranged in an array.

  In the above-described single-phase multiple circuit measuring apparatus, the distribution board is a data center distribution board.

  In the single-phase multiple circuit measuring device described above, a plurality of ZCT terminals to which ZCT (Zero Current Transformer) for detecting leakage current of each single-phase circuit is coupled, and the plurality of ZCT terminals And a ZCT signal processing circuit for processing an analog signal input from a terminal.

  In the above-described single-phase multiple circuit measurement device, including a plurality of DI terminals connected to contacts representing the operation state of the MCCB, and a DI input sensing unit that senses the operation state of the MCCB through the plurality of DI terminals. Characterized by being composed.

  In the single-phase multiple circuit measurement device described above, a current sensing circuit that performs analog signal processing on the current signal sensed by the CT, and an ADC that performs analog / digital conversion on the signal from the current sensing circuit ( Analog Digital Converter).

  In the above-described single-phase multiple circuit measurement device, when the reference current direction on the power line and the reference measurement direction of the CT are opposite to each other in the power line passing through the plurality of CTs, the current sensed on the corresponding power line has a phase. Inverted and used for power calculation.

  In the single-phase multiple circuit measuring apparatus described above, the current sensed from a part of the plurality of CTs is used for power calculation with its phase reversed.

In the above-described single-phase multiple circuit measurement device, information on the phase of the power line passing through is set and stored, and at least the information on the phase is used when determining whether to invert the phase. To.

  In the above-described single-phase multiple circuit measurement device, information on the phase of the power line passing through and left-right information indicating where the single-phase multiple circuit measurement device is installed on the left or right side around the bus bar are set. -Stored, and at least the information on the phase and the left and right information are used when determining whether to invert the phase.

  According to one aspect of the present invention, in a power line penetrating a plurality of CTs, when the reference current direction on the power line is opposite to the reference measurement direction of the CT, the current sensed on the power line inverts the phase. Power measurement, even if it is configured so that the power lines at both ends of the power lines for multiple (three) single-phase circuits are not penetrated through the single-phase multiple circuit measurement device There is an effect that becomes possible.

  Currents sensed from one of multiple CTs, or currents sensed from all of the remaining CTs excluding one, can be used for power calculation by inverting the phase. Among the power lines for the (three) single-phase circuits, there is an effect that power measurement is possible even if the power lines at both ends are configured not to penetrate the single-phase multiple circuit measurement device.

  Note that when the single-phase multiple circuit measurement apparatus according to one aspect of the present invention is used, a plurality of (three) single-phase circuit measurements can be processed by a single housing, a single processor, and a single communication module. Thus, it becomes possible to share components that occupy a high specific gravity, so that the cost for constructing the measurement system can be greatly reduced.

  In addition, according to one aspect of the present invention, the size of the measurement device can be reduced by configuring the single-phase multiple circuit measurement device so that the two power lines at the ends are not penetrated and the remaining power lines are penetrated. In addition to the above, there is an advantage that a margin space can be secured between the adjacent single-phase multiple circuit measurement devices. As a result, the degree of freedom increases in the arrangement and attachment of the measuring device, and there is an effect that it is not necessary to use a slide coupling method.

  According to one aspect of the present invention, there is an effect that an input / output port can be easily configured on the side surface of the single-phase multiple circuit measurement device.

FIG. 1 is a perspective view illustrating an example in which a branch circuit measuring device is installed on a distribution board in accordance with patent technology registered by the present applicant (main measuring device and serial communication line omitted). FIG. 2 is a diagram illustrating that the single-phase multiple circuit measuring apparatus 100 according to the embodiment of the present invention is installed in the distribution board 10. FIG. 3 shows a case where the single-phase multiple circuit measuring apparatus 100 according to an embodiment of the present invention is connected to a three-phase four-wire main line as a drawing illustrating a situation where the single-phase multiple circuit measuring apparatus 100 is installed on three single-phase circuits. is there. FIG. 4 is an external perspective view of the single-phase multiple circuit measuring apparatus 100 according to one embodiment of the present invention. FIG. 5 is an exploded perspective view illustrating the single phase multiple circuit measuring apparatus 100 according to an embodiment of the present invention. FIG. 6 is a block diagram illustrating a single-phase multiple circuit measurement system to which the single-phase multiple circuit measurement devices 100 and 100 ′ according to one embodiment of the present invention are applied. FIG. 7 is a diagram illustrating a single-phase multiple circuit measuring device 20 as a comparative example compared to the present invention, and illustrates a situation where the single-phase multiple circuit measuring device 20 is installed over three single-phase circuits. It is the drawing. FIG. 8 shows another situation where the single-phase multi-circuit measuring apparatus 100 according to one embodiment of the present invention is installed on three single-phase circuits when it is connected to a three-phase three-wire main line in the drawing. is there.

  The embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art (one skilled in the art) can easily implement the embodiments of the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly describe the present invention in the drawings, portions not related to the description are omitted, and similar names and drawing symbols are used for similar portions throughout the specification.

  FIG. 7 is a diagram illustrating a single-phase multi-circuit measuring device 20 as a comparative example compared with the present invention, and illustrates a situation where the single-phase multi-circuit measuring device 20 is installed over three single-phase circuits. It is a drawing. Since the comparative example is merely a reference invention for explaining the process leading to the present invention as an invention in the middle of the process leading from the prior art to the present invention, it will be described only briefly.

  Conventionally, for power measurement by Korean Patent No. 1469448 (“Multi-line power measurement system that increases efficiency and simplicity”), each single-phase circuit has a measuring device, but in the comparative example, The measurement for the three single-phase circuits is performed by the single single-phase multi-circuit measuring device 20.

  The single-phase multi-circuit measuring apparatus 20 according to the comparative example can measure power as one module for three single-phase circuits. The single-phase multi-circuit measuring apparatus 20 has six through holes in the case, and measures three single-phase circuits by sharing a single processor mounted on a single PCB assembly. When the single-phase multiple circuit measuring device 20 according to the comparative example is used, the number of the measuring device can be reduced to 1/3, and the cost can be saved by sharing an expensive processor in particular.

  However, the single-phase multiple circuit measuring device 20 according to the comparative example has a problem that the size is three times larger than that of the conventional measuring device. Usually, the adjacent single-phase multiple circuit measuring devices 20 are closely contacted due to the closely connected / arranged branch circuits, and the difficulty in arrangement and installation is not solved, and the configuration of the input / output ports Spatial problems will remain.

  FIG. 2 is a diagram illustrating a single-phase multiple circuit measuring apparatus 100 according to an embodiment of the present invention installed on a distribution board 10, and FIG. 3 is a single-phase multiple circuit measuring apparatus according to an embodiment of the present invention. FIG. 3 (A) shows the situation where 100 is installed over three single-phase circuits. In FIG. 3 (A), the first power line that penetrates is connected to the N line, and FIG. ), The first power line to be penetrated is connected to the A line.

  The present invention is applied to a distribution board 10 in which the single-phase circuits 4 branched from the main line 5 are arranged in an array. In particular, the distribution board 10 is typically a data center distribution board. In a distribution board used in a server for a data center, a single-phase circuit having the same capacity or the same current rating is arranged and installed in an array (several tens to hundreds of feeders). In this way, single-phase circuits having the same rating are arranged in an array.

  The main line 5 is drawn through the main MCCB 1 and branches into a plurality of single-phase circuits 4 using the bus bars 6. A single-phase circuit MCCB 2 is installed for each single-phase circuit 4. The single-phase multiple circuit measurement device 100 is installed on the side surface of the single-phase circuit MCCB 2, but the single-phase multiple circuit measurement device 100 is installed corresponding to the plurality of single-phase circuits 4. According to the illustrated FIG. 2, one single-phase multiple circuit measuring device 100 is installed corresponding to three single-phase circuits 4 and three single-phase circuit MCCBs 2.

  The adjacent single-phase circuits 4 corresponding to the single-phase multiple circuit measuring device 100 do not penetrate all the single-phase multiple-circuit measuring device 100 but are included in the power lines constituting the multiple single-phase circuits 4. Thus, the two power lines 4S at both ends are not penetrated but the remaining power lines 4M are penetrated. According to one embodiment of the present invention, the remaining four power lines 4M except for the two power lines 4S at both ends among the six power lines constituting the three adjacent single-phase circuits 4 are respectively penetrated. .

  In FIG. 2, the main measurement device and the communication line connecting the main measurement device and the single-phase multiple circuit measurement device 100 are omitted, but these are installed together on the distribution board 10.

  FIG. 4 is an external perspective view of a single-phase multiple circuit measuring apparatus 100 according to an embodiment of the present invention. FIG. 5 is an exploded view illustrating the single-phase multiple circuit measuring apparatus 100 according to an embodiment of the present invention. It is a perspective view.

  The housing includes a lower housing 110 and an upper housing 120. The lower housing 110 includes a lower housing frame 111 and a lower housing cover 112. The upper housing 120 includes an upper housing first cover 121, an upper housing frame 122, and an upper housing first. 2 covers 123. In the present embodiment, the form in which the lower housing 110 and the upper housing 120 are coupled to each other has been illustrated, but it goes without saying that an integrated housing is also included in the scope of the present invention.

  The lower housing 110 and the upper housing 120 are fastened together using first to fourth fastening screws 170A to 170D, and the first through fourth through holes 180A to 180D are interposed between the lower housing 110 and the upper housing 120. Is formed.

  The housing is provided with a plurality of through holes 180A to 180D, and a part of a power line constituting a plurality of adjacent single-phase circuits is passed through the through-holes. Specifically, three adjacent single-phase circuits are configured. Among the six power lines, four through holes 180A to 180D through which the remaining four power lines excluding the two power lines at both ends are respectively penetrated.

  A PCB assembly 140 is accommodated in a space between the upper housing frame 122 and the upper housing second cover 123. The PCB assembly 140 is provided on the PCB board with a first serial port 141A and a second serial port 141B, an LCD 142, and a ZCT terminal 143. A DI terminal 144 and a processor (not shown) are mounted.

  The CT includes a lower core 131 and a bobbin assembly 132. Specifically, the first CT includes a first lower core 131A and a first bobbin assembly 132A, and the second CT includes a second lower core 131B. The third CT is composed of a third lower core 131C and a third bobbin assembly 132C. Each bobbin assembly 132 includes an upper core, a bobbin, and a winding coil (not shown).

  Each lower core 131 is accommodated in the lower housing 110, and each bobbin assembly 132 is accommodated in the upper housing 120. When the lower housing 110 and the upper housing 120 are fastened, a plate below the lower core 131 is provided. The spring (leaf spring) brings the lower core 131 and the upper core into elastic contact with each other.

  The plurality of CTs (Current Transformers) are CTs of through holes that are installed around the through holes in order to sense currents flowing in the plurality of single-phase circuits built in the housings 110 and 120, respectively. A plurality of CTs are installed around the through-holes to sense currents flowing through the three single-phase circuits. As shown in the drawing, the third through-holes 180C are included in the four through-holes 180A to 180D. The remaining through holes 180A, 180B, and 180D may be installed around the excluded holes.

  Alternatively, among the four through holes 180A to 180D, the remaining through holes 180A, 180C and 180D excluding the second through hole 180B can be installed. It can be installed around the remaining through holes except for the th or third through hole.

  The CT is installed corresponding to at least one power line for each single-phase circuit among the penetrating power lines.

  The plurality of through-holes provided in the housing are provided such that the two power lines at both ends of the power lines constituting the plurality of adjacent single-phase circuits are not penetrated, and the remaining power lines are penetrated. Is done. Specifically, as shown in FIGS. 2 and 3, the two power lines on both sides of the six power lines constituting the three single-phase circuits do not penetrate, and the remaining four power lines are the power lines. Only four through holes are formed so that one power line is penetrated.

  Mounting taps 160A and 160B are not two side surfaces through which the power line penetrates, but two side surfaces through which the power line does not penetrate, in order to fix the housing to the base of the distribution board. Combine with the housing in a detachable manner.

  FIG. 6 is a block diagram illustrating a single-phase multiple circuit measurement system to which the single-phase multiple circuit measurement devices 100 and 100 ′ according to one embodiment of the present invention are applied.

  A single-phase multiple circuit measurement system according to an embodiment of the present invention includes a main measurement device 200, one or more single-phase multiple circuit measurement devices 100 and 100 ', and a communication line. The block diagram of FIG. 6 does not necessarily match the physical configuration as a block diagram from the viewpoint of electricity and signals.

  The main measurement device 200 and the single-phase multiple circuit measurement devices 100 and 100 ′ are connected via a communication line 300, but the single-phase multiple circuit measurement devices 100 and 100 ′ are connected by a daisy chain. . Port A and Port B of the single-phase multiple circuit measuring devices 100 and 100 'correspond to the first serial port 141A and the second serial port 141B shown in FIG.

  The main measuring device 200 includes a communication module 21, a calculation and signal processing unit 22, a PT 23 (Potential Transformer), a voltage sensing circuit 24, an ADC 25 (Analog Digital Converter), and the like.

  PT23 senses the voltage, specifically contacts one of the power lines in the distribution board such as the main line or branch circuit, and outputs a voltage signal proportional to the voltage on the power line. Provided to the sensing circuit 24. The voltage sensing circuit 24 performs analog signal processing on the output signal of the PT 23 and provides it to the ADC 25. The ADC 25 performs analog / digital conversion on the input analog signal, and outputs voltage data to the calculation and signal processing unit 22. provide.

  The communication module 21 is a module that performs, for example, RS485 communication as performing a serial communication function. The calculation and signal processing unit 22 performs various calculations and signal processing, and can include a control function for controlling each component of the main measuring device 200 together.

  The communication module 21 transmits the data provided by the calculation and signal processing unit 22 to each single-phase multiple circuit measuring device 100, 100 ′ via the communication line 300, and is transmitted from each single-phase multiple circuit measuring device 100, 100 ′. The incoming data is provided to the calculation and signal processing unit 22.

  In addition, the main measuring device 200 has an operation unit for directly inputting a user's operation and command, a display unit for displaying information to the user, a separate communication for communicating with an upper layer module or server, etc. Modules (all not shown) can be included.

  The single-phase multiple circuit measuring devices 100 and 100 ′ include a communication module 11, a calculation and signal processing unit 12, a 3-channel CT 13, a 3-channel current sensing circuit 14, an ADC 15, a ZCT current sensing circuit 16, a DI input sensing unit 17, and a DI. The signal processing unit 18 is included.

  The communication module 11 receives data from the main measuring device 200 using serial communication and transmits the generated data to the main measuring device 200, and the calculation and signal processing unit 12 performs calculation and input using the input data. It is possible to perform signal processing and control each component constituting the single-phase multiple circuit measuring devices 100 and 100 ′.

  The 3-channel CT 13 is built in the single-phase multi-circuit measuring devices 100, 100 ′ as the first to third CTs described above, and generates a current signal proportional to the current of the power line that penetrates without contacting the power line. Each of the three-channel current sensing circuits 14 performs analog signal processing on a current signal input to each channel.

  The ZCT current sensing circuit 16 performs analog signal processing on a current signal input from an external ZCT (not shown), and the external ZCT is provided for each of the three single-phase circuits. The two power lines constituting the single-phase circuit can be installed on the side surface of the single-phase multi-circuit measuring apparatus 100, 100 ′ so as to penetrate at a time.

  The external ZCT is for detecting the leakage current of each single-phase circuit, and the single-phase multiple circuit measuring devices 100 and 100 ′ according to an embodiment of the present invention have a plurality of ZCTs connected to the upper side of the ZCT. It can be fixed by rotating and pressing a bolt from above after inserting a ZCT lead wire into the ZCT terminal 143.

  The ZCT current sensing circuit 16 processes analog signals input from a plurality of ZCT terminals 143, and after the ADC 15 performs analog / digital conversion, it provides the calculation and signal processing unit 12 with the calculation and signal processing. The signal processing unit 12 and / or the main measuring device 100 is used.

  The ADC 15 performs analog / digital conversion on the current signals input from the three-channel current sensing circuit 14 and the three-channel ZCT current sensing circuit 16 to generate current data and provide it to the calculation and signal processing unit 12.

  The DI input sensing unit 17 is a circuit that senses the operation state of the MCCB 2 through the plurality of DI terminals 144 described above.

  Normally, MCCB2 has a contact output terminal for displaying an operation state such as its own trip state, and the DI terminal 144 of the single-phase multiple circuit measuring devices 100 and 100 'is connected to this contact output terminal. After inserting both ends of the conductive wire connected to the contact output terminal into the DI terminal 144, it can be fixed by rotating and pressing the bolt from above.

  The DI input sensing unit 17 senses the contact output terminal through the DI terminal 144 and outputs it as a logic signal, and the DI signal processing unit 18 performs signal processing on the input logic signal.

  Hereinafter, the operation of the single-phase multiple circuit measurement system according to the embodiment of the present invention will be described.

  The main measuring device 200 has the same voltage as each single-phase circuit using the PT 23, the voltage sensing circuit 24, the ADC 25, etc., but generates a voltage signal obtained by sensing the voltage at another fulcrum and converts the voltage signal to analog / digital. Convert to generate digital voltage data. The voltage data may be a set of instantaneous voltage values obtained by sampling a voltage signal of one cycle or more at a sampling interval.

  Since each single-phase circuit is branched from the lead-in main line in the distribution board, the voltage of the single-phase circuit is the same as the voltage of the connected main line or other single-phase circuits. Therefore, the voltage data provided from the main measuring device 200 can be shared by the single-phase multiple circuit measuring devices 100 and 100 '.

  The communication module 21 of the main measuring device 200 has the same voltage as that of the single-phase circuit via the communication line 300, but the voltage data a derived from the voltage signal sensed at another fulcrum is used for each single-phase multi-circuit measuring device 100. , 100 ′.

  On the other hand, each single-phase circuit included in the single-phase multiple circuit measuring devices 100 and 100 ′ senses the current of the power line penetrating through the CT 13 and the current sensing circuit 14 to generate a current signal, and performs signal processing. Then, the ADC 15 generates analog / digital converted current data. The current data of each single-phase circuit may be a set of instantaneous current values obtained by sampling current signals of one cycle or more at a sampling interval.

  Since the voltage sampling time and the current sampling time in each single-phase circuit should be synchronized, the main measuring device 200 synchronizes its own sampling time with the sampling time in the single-phase multi-circuit measuring devices 100 and 100 ′. In order to achieve this, a synchronization signal or a synchronization message is provided to the single-phase multi-circuit measuring devices 100 and 100 ′.

  The synchronization signal may be included in the communication line 300 or provided as a signal line separate from the communication line 300, and the synchronization message may be provided via the communication line 300, for example, in the form of a broadcast message. .

  The communication module 11 built in the single-phase multi-circuit measuring devices 100 and 100 ′ has the same voltage as the single-phase circuit, but sensing is performed at a fulcrum other than the fulcrum where the single-phase multi-circuit measuring devices 100 and 100 ′ are installed. The voltage data derived from the received voltage signal is received from the main measuring device 200, and the calculation and signal processing unit 12 of the single-phase multi-circuit measuring devices 100 and 100 ′ generates the received voltage data and the built-in CT 13 The power data is generated by calculating the power for each single-phase circuit at least using the current data derived from the current signal.

  For example, the calculation and signal processing unit 12 can generate a set of instantaneous power values by multiplying the instantaneous value of the voltage data and the instantaneous value of the voltage data at the same time point in each sample, and can generate active power, reactive power, and energy. Etc. can be calculated.

  Among multiple (three) CTs, the current sensed from a part is inverted in phase and used for power calculation. Or, the current sensed from one of the multiple (three) CTs, or the current sensed from all of the remaining (except for one of the multiple (three) CTs), reverses the phase. Used for power calculation.

  Or, in a power line that penetrates multiple (three) CTs, if the reference current direction on the power line and the reference measurement direction of the CT are opposite, the current sensed from the power line inverts the phase and calculates the power Used for.

  The reference measurement direction of CT can be determined when designing the single-phase multi-circuit measurement apparatus 100 as one of the two directions penetrating the CT. The reference current direction on the power line can be determined in response to the reference voltage direction of the single phase circuit as a reference direction among the two directions of the current flowing through the power line.

  Specifically, for example, FIG. 3A will be described. In the single-phase multiple circuit measurement apparatus 100, the single-phase multiple circuit measurement apparatus 100 is designed so that the left to right direction in the drawing is the reference measurement direction of CT, and A → When N, B → N, and C → N are reference current directions, the reference current direction (arrow indication direction) and CT on the first power line from the top among the power lines penetrating the single-phase multiple circuit measuring device 100 Therefore, the current sensed from the corresponding power line is inverted in phase and used for power calculation. Since the reference current direction on the second and fourth power lines penetrating is the same as the reference measurement direction of the CT, the current sensed from the corresponding power line is used for power calculation without inverting the phase.

  3B, since the reference current direction on the first power line that penetrates is the same as the reference measurement direction (left to right) of the CT, the current sensed from the power line has a phase. Used for power calculation without inversion, but the reference current direction on the second and fourth power lines penetrating and the reference measurement direction of CT are opposite, so the current sensed from the power line inverts the phase And used for power calculation.

  3A and 3B explained the case of the three-phase four-wire system, but the same applies to the case of the three-phase three-wire system as shown in FIGS. 8A and 8B. Is done.

  Referring to FIG. 8A, the single-phase multi-circuit measurement apparatus 100 is designed in the single-phase multi-circuit measurement apparatus 100 so that the left-to-right direction on the drawing is the CT reference measurement direction, and A → B, B → C, and When C → A is the reference current direction, the reference current direction (arrow indication direction) on the first power line from the top among the power lines penetrating the single-phase multiple circuit measuring device 100 and the CT reference measurement direction (left) (→ Right) is the opposite, so the current sensed from the corresponding power line reverses the phase and is used for power calculation. Since the reference current direction on the second and fourth power lines penetrating is the same as the reference measurement direction of the CT, the current sensed from the corresponding power line is used for power calculation without inverting the phase.

  8B, since the reference current direction on the first power line that penetrates and the reference measurement direction (left to right) of the CT are the same, the current sensed from the power line has a phase. Used for power calculation without inversion, but the reference current direction on the second and fourth power lines penetrating and the reference measurement direction of CT are opposite, so the current sensed from the power line inverts the phase And used for power calculation.

  The single-phase multiple circuit measuring device 100 has a memory (not shown) that can store setting information, and the installer that installs the single-phase multiple circuit measuring device 100 has a phase in which the power lines are connected to each of the power lines that pass through. Information and left and right information are set and stored. Here, the left / right information is installed on the distribution board where the single-phase multiple circuit measuring device 100 is located on the left or right side with the bus bar (or the connecting fulcrum where the branched single-phase circuit is connected to the main line) as the center. The information about the phase and the information on the phase and the left and right information are used when determining whether or not phase inversion is possible.

  For example, in FIG. 3A, the single-phase multiple circuit measuring device 100 is installed on the right side of the bus bar on the distribution board. However, the arrangement order of the power lines is assumed to be the same, but the single-phase multiple circuit measuring device 100 is assumed. Is placed on the left side of the bus bar, the reference current direction in the drawing is the left → right direction instead of the right → left direction in the drawing, so the reference current direction on the power line and the CT reference measurement Since the directions are the same, this must be used without reversing the phase of the sensed current.

  The direction of the reference current on the power line differs depending on where the single-phase multiple circuit measuring device 100 is installed in the left or right, and thus the possibility of phase inversion also differs.

  By reversing the phase of the current sensed from some of the power lines according to one aspect of the present invention and using the method used for power calculation, a plurality of (three) single-phase circuits can be used. Even if the power lines on both sides of the power line are configured not to penetrate the single-phase multiple circuit measurement device, there is an effect that power measurement is possible.

  The power data b generated for each single-phase circuit is transmitted to the main measurement device 200 using the communication module 11 of the single-phase multiple circuit measurement devices 100 and 100 ′.

  On the other hand, in the embodiment, the main measuring device 200 provides voltage data to each single-phase multi-circuit measuring device 100, 100 ′ through communication, and each single-phase multi-circuit measuring device 100, 100 ′ calculates power. However, as a modification, each single-phase multiple circuit measuring device 100, 100 ′ may transmit current data to the main measuring device 200, and the main measuring device 200 may calculate the power for each single-phase circuit. At this time, the single communication module 11 provided in each of the single-phase multiple circuit measuring devices 100 and 100 ′ is like a set of instantaneous current values derived from current signals generated by a plurality (three channels) of CTs 13. The current data is transmitted to the main measuring device 200.

  Each single-phase multiple circuit measuring device 100, 100 ′ performs power measurement or the like on a plurality of (three) adjacent single-phase circuits, but the calculation and signal processing unit 12 is a single element, that is, a single Embodied as a processor. The processor can be, for example, a microprocessor, a microcontroller or a dedicated chip.

  In order to measure power according to the conventional Korean registered patent No. 1469448 (“Multi-line power measurement system that increases efficiency and simplicity”), a branch circuit measurement device must be installed for each single-phase circuit. When the number of single-phase circuits increases from several tens to one hundred, there is a problem that a large amount of cost is required to construct a measurement system.

  However, when the single-phase multi-circuit measurement apparatus 100, 100 ′ according to one aspect of the present invention is used, a plurality of (three) single-phase circuit measurements are processed by a single housing, a single processor, and a single communication module. In particular, parts that occupy a high specific gravity in the construction cost such as a processor can be shared, and the construction cost of the measurement system can be greatly reduced, and approximately 1/2 to 1/3. Will come down to the cost of.

  The adjacent branch circuit measuring devices 3 can be placed in close contact with each other, and the input / output ports are also greatly restricted. However, as can be seen from FIG. 2, according to one aspect of the present invention, not only can the size of the single-phase multiple circuit measurement devices 100 and 100 ′ be reduced, but also the adjacent single-phase multiple circuit measurement devices 100 and 100 ′ can be reduced. There is an effect that a spare space can be secured between them. This increases the degree of freedom in the arrangement and attachment of the measuring device, and there is an effect that it is not necessary to use the above-described slide coupling method. For example, a space where the taps such as the mounting taps 160 </ b> A and 160 </ b> B can be combined or configured on the side surfaces of the single-phase multi-circuit measuring devices 100 and 100 ′ is used.

  Conventionally, since the adjacent branch circuit measurement devices 3 are in close contact with each other, there is a problem in that the side surfaces of the adjacent branch circuit measurement devices 3 cannot be used when forming the input / output ports of the branch circuit measurement device 3. According to one aspect of the present invention, there is an effect that the input / output port can be easily configured on the side surface of the single-phase multiple circuit measurement device. When the input / output terminals such as the ZCT terminal 143 and the DI terminal 144 are formed on the side surface of the single-phase multiple circuit measuring device as shown in FIGS. , It will be possible to fully utilize the marginal space on the side.

  In the distribution board illustrated in FIG. 1, in order to constitute a measurement system for 18 single-phase circuits, 18 branch circuit measurement devices 3 could only be arranged closely. However, if the present invention is used, the measurement system for 18 single-phase circuits is configured on the distribution board as illustrated in FIG. 2, but the six single-phase multiple circuit measurement devices 100 are the same. , 100 ′ need only be arranged. Furthermore, according to one aspect of the present invention, the single-phase multiple circuit measurement device can be configured so that at least one or two power lines at the end do not penetrate and the remaining power lines are penetrated, There is an advantage in that the size of the single-phase multi-circuit measurement device can be reduced and a large margin space can be provided between adjacent single-phase multi-circuit measurement devices.

  The present invention is useful for improving the efficiency of a measurement system in a distribution board in which many single-phase circuits are arranged and installed.

1, 2 MCCB (Molded Case Circuit Breaker)
3 Measuring device for branch circuit 4 Multiple single-phase circuits 4S, 4M Power line 5 Main line 6 Busbar 10 Distribution board 11, 21 Communication module 13 CT (Current Transformer)
14 Current sensing circuit 15, 25 ADC (Analog Digital Converter)
16 Current sensing circuit for ZCT (Zero Current Transformer) 17 DI input sensing unit 18 DI signal processing unit 20, 100, 100 ′ Single-phase multiple circuit measuring device 22 Calculation and signal processing unit 23 PT (Potential Transformer)
24 Voltage Sensing Circuit 200 Main Measuring Device 110 Lower Housing 120 Upper Housing 131 Lower Core 131A, 131B, 131C First Lower Core, Second Lower Core, Third Lower Core 132 Bobbin Assembly 132A, 132B First Bobbin Assembly, First 2 bobbin assembly 132C 3rd bobbin assembly blue 140 PCB assembly 141A, 141B 1st serial port, 2nd serial port 142 LCD
143 ZCT terminal 144 DI terminals 160A and 160B Mounting taps 170A to 170D First fastening screw to fourth fastening screw 180A to 180D First through hole to fourth through hole 200 Main measuring device 300 Communication line A Voltage data B Power data

Claims (20)

A housing having a plurality of through-holes (holes) through which power lines constituting a plurality of adjacent single-phase circuits penetrate;
A plurality of CTs built around the through-holes for sensing each of the currents flowing through the plurality of single-phase circuits built in the housing,
The plurality of through-holes provided in the housing are configured such that the two power lines at both ends of the power lines constituting the plurality of adjacent single-phase circuits are not penetrated but the remaining power lines are penetrated. A single-phase multi-circuit measuring apparatus, characterized in that A housing having four through-holes through which the remaining four power lines excluding two power lines at both ends among six power lines constituting three adjacent single-phase circuits are respectively passed;
A plurality of CTs built around the through-holes for sensing each of the currents flowing in the three single-phase circuits built in the housing, and
2. The single-phase multiple circuit measuring device according to claim 2, wherein the two power lines at both ends do not penetrate through holes provided in the housing.   The single-phase multi-circuit measurement device according to claim 2, wherein the CT is installed around the remaining through holes excluding the second or third through hole among the four through holes.   The current sensed from one of the plurality of CTs, or the current sensed from all of the remaining CTs excluding one is used for power calculation with phase inversion. The single-phase multi-circuit measuring device according to claim 1 or 2, characterized by:   And a single processor built in the housing and calculating at least power for each single-phase circuit using at least current data derived from current signals generated by the plurality of CTs. The single-phase multiple circuit measuring device according to claim 1 or 2.   The communication module according to claim 1, further comprising: a single communication module built in the housing and transmitting at least current data derived from current signals generated by the plurality of CTs. Single-phase multiple circuit measurement device. A communication module that is built in the housing and has the same voltage as the single-phase circuit but receives voltage data derived from a voltage signal sensed at another fulcrum from a main measurement device;
All power is calculated for each single-phase circuit using at least the current data derived from the current signals generated by the plurality of CTs and the voltage data received from the communication module. A single processor for generating power data, and
The single-phase multiple circuit measurement device according to claim 1, wherein the generated power data is transmitted to the main measurement device using the communication module.   A mounting tap that is coupled to each of two side surfaces through which the power line does not penetrate among the four side surfaces of the housing to fix the housing to the base. Item 3. The single-phase multiple circuit measurement device according to item 1 or 2. The housing is
The single-phase multi-circuit measurement device according to claim 1, wherein the single-phase multi-circuit measurement device includes an upper housing and a lower housing. Power is calculated using current data derived from the current signal generated by the built-in penetration type CT and voltage data received from the communication module, but multiple single-phase circuits adjacent as a single device Is a single-phase multiple circuit measuring device that measures all
Among the power lines constituting the plurality of adjacent single-phase circuits, the two power lines at the ends are configured not to pass through, and the remaining power lines are configured to pass through,
A single-phase multi-circuit measurement apparatus, wherein a single through-phase CT is installed corresponding to at least one power line for each single-phase circuit among the penetrating power lines.   The single-phase multiple circuit measuring device according to any one of claims 1, 2, and 10, wherein a single-phase circuit branched from a lead-in main line is applied to a distribution board arranged in an array.   The single-phase multi-circuit measuring device according to claim 11, wherein the distribution board is a data center distribution board. Multiple ZCT terminals to which ZCT (Zero Current Transformer) for detecting leakage current of each single-phase circuit is connected,
A ZCT signal processing circuit for processing analog signals input from the plurality of ZCT terminals;
The single-phase multiple circuit measuring device according to claim 1, wherein the single-phase multiple circuit measuring device includes: A plurality of DI terminals connected to contacts representing the operating state of the MCCB;
DI input sensing unit for sensing the operation state of the MCCB through the plurality of DI terminals,
The single-phase multiple circuit measuring device according to claim 1, wherein the single-phase multiple circuit measuring device is configured to include A current sensing circuit that performs analog signal processing on the current signal sensed by the CT;
ADC (Analog Digital Converter) that performs analog / digital conversion on the signal from the current sensing circuit;
The single-phase multiple circuit measuring device according to claim 1, wherein the single-phase multiple circuit measuring device is configured to include   When the reference current direction on the power line and the reference measurement direction of the CT are opposite to each other in the power line passing through the plurality of CTs, the current sensed on the corresponding power line should be used for power calculation by inverting the phase. The single-phase multi-circuit measuring device according to claim 1 or 2, characterized by:   The single-phase multiple circuit measurement device according to claim 11, wherein the single-phase circuits arranged in the array have the same capacity or the same current rating.   3. The single-phase multi-circuit measurement apparatus according to claim 1, wherein a current sensed from a part of the plurality of CTs is used for power calculation with a phase inverted. 4.   19. The information according to claim 18, wherein information regarding the phase of the power line passing through is set and stored, and at least the information regarding the phase is used when determining whether to invert the phase. Phase multiple circuit measuring device.   Information about the phase of the power line passing through and left and right information indicating where the single-phase multi-circuit measuring device is installed on the left or right side around the bus bar are set and stored. 19. The single-phase multi-circuit measurement apparatus according to claim 18, wherein the information and the left-right information are used when determining whether to invert the phase.