KR101658543B1 - Digital power meters for power distribution panel - Google Patents

Abstract

The present invention can automatically assign and set a communication specific number for a plurality of branch line measuring instruments, thereby saving a lot of time and man-hour in individual manual setting and automatic setting of a communication specific number The present invention provides a meter for a multi-rail line, comprising: a main meter having a first microcomputer unit and a first communication unit; A plurality of branch line meters having a second microcomputer unit and a second communication section; A first communication line for providing a communication path between the main instrument and the ground wire measurement period data; And a plurality of second communication lines connected between the main instrument and adjacent ground measuring instruments or another ground measuring period adjacent to one ground measuring instrument to provide a data communication path.

Description

[0001] DIGITAL POWER METERS FOR POWER DISTRIBUTION PANEL [0002]

The present invention relates to a power meter, and more particularly, to a multi-line meter capable of automatically setting a communication unique number between a main meter installed in a distribution board or an electric switchboard and a plurality of line measuring instruments, .

A digital power meter (abbreviated as "power meter" hereinafter) is installed in the switchboard or distribution board to detect the voltage and current of the power grid and calculates and displays various electric quantities including power and electric power based on the detected voltage and current. Device.

Recently, as the importance of energy management has become more important, the scope of power monitoring is progressing from total load energy information management in switchboard / distribution board to analytical energy management for each load in switchboard / distribution board. As a result, it has become necessary to measure the amount of electricity per branch circuit as well as to measure the electricity quantity of the busbar (power supply line commonly connected to a plurality of branch lines in the power line) in the switchboard / distribution board as well as the branch line load of the branch line. A digital power meter for branching boards (a so-called multi-line meter for distribution boards, hereinafter abbreviated as a multi-line meter) has been developed.

In the digital power meter for distribution boards, a plurality of branch line meters for branch load measurement of the branch lines transmit measurement information on the electric quantities of the branch line circuits to the main meter through communication, and the main meter receives the plurality of branch line meters And transmits the measurement information on the electric quantities of one branch wire circuit to the higher-level communication-connected system. Thus, the user can centrally monitor and monitor the power state of a plurality of power distribution boards physically scattered through the host system.

An exemplary configuration of such a distribution panel digital power meter will be described with reference to FIG.

FIG. 1 is a block diagram showing an electrical connection structure of a power device and a measuring device in a conventional distribution board including a plurality of digital power meters.

The electrical connection configuration of the power devices and the measurement devices inside and outside the distribution board includes a four-pole main circuit ML, a plurality of branch circuits SL, a main wiring circuit breaker 10a, a plurality of branch wiring circuit breakers 10b, 30 and a plurality of branch line measuring instruments 20.

1, an AC three-phase and an N-phase (neutral phase) four-pole main circuit ML such as R phase, S phase and T phase are provided so as to pass through the distribution board, A branch circuit connected to the three-phase circuit except for the phase circuit, that is, a plurality of branch circuits (SL), is connected and extended to the load.

One main circuit circuit breaker 10a is installed in the distribution panel in order to cut off the quadrupole circuit ML when a fault current such as an overcurrent or a short-circuit current occurs on the quadrupole circuit ML, A plurality of branch wire circuit breakers 10b are provided in the plurality of branch wire circuits SL so that a plurality of loads connected to the branch wire circuits SL and the branch wire circuits SL from the fault current generated in the branch wire circuits SL .

The plurality of branch wire measuring instruments 20 are provided so as to be electrically connected to the respective branch wire circuits SL and the four pole main wire circuits ML so as to have the same current and voltage as the branch wire circuits SL and the four pole main wire circuits ML And transmits the measurement information to the main measuring instrument 30 through communication.

The main measuring instrument 30 transmits measurement information on the electricity quantity of each branch circuit SL received and collected from the plurality of branch wire measuring instruments 20 to the upper system connected to the communication.

In the digital electric power meter for distribution boards according to the related art, the measurement information communication between one main meter 30 and the plurality of branch line meters 20 is performed by connecting a serial communication line such as a common communication line RS1, for example, RS-485, (30) and a plurality of ground wire measuring instruments (20).

Therefore, since the common communication line RS1 is shared by the plurality of branch line measuring instruments 20, for example, when the main measuring line 30 requests the plurality of branch line measuring instruments 20 for measurement data, It is possible to avoid data collision.

In order to allow only one of the plurality of branch wire measuring instruments 20 to respond, each main wire measuring instrument 20 is assigned and set with a unique communication specific number so that the main measuring instrument 30 can determine the specific communication specific It is necessary to request the measurement data by the number and to respond only to the branch measuring instrument 20.

However, in the prior art, since it is not known which communication specific number is to be set in the line measuring instrument before the field installation, a factory default value is set and shipped by the manufacturer of the line measuring instrument.

In the case where a plurality of line measuring instruments in which a basic value of the communication specific number is set as described above are installed in the field as shown in FIG. 1, in this state, each of the plurality of line measuring instruments 20 holds a unique communication unique number The user must individually set the communication specific number for the plurality of branch line measuring instruments 20 in the field so that each of the plurality of branch line measuring instruments 20 has a unique communication line number. In this case, as the number of line measuring instruments for the multiple lines increases, the number of communication specific numbers to be individually set by the user increases, which requires a lot of work and time.

Also, there is a great risk that a safety accident such as an electric shock accident occurs due to contact with a panel board constituting a live line as a user directly manipulates the branch line instrument in the field.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a system and method for automatically allocating and setting communication unique numbers for a plurality of branch line instruments, And can automatically set a communication specific number that can provide electrical safety of the installer.

It is another object of the present invention to provide a system and method for automatically setting and assigning a communication specific number to a plurality of branch line measuring instruments, thereby saving a lot of time and manpower during individual manual setting, The present invention provides a method of automatically setting a communication inherent number of a multi-line instrument capable of automatically setting a communication inherent number.

According to another aspect of the present invention, there is provided a meter for multi-line multi-

A main meter having a first microcomputer unit and a first communication unit;

A plurality of branch line meters having a second microcomputer unit and a second communication section;

A first communication line for providing a communication path between the main instrument and the ground wire measurement period data; And

And a plurality of second communication lines connected to the main instrument and adjacent ground measuring instruments or to another ground measuring period adjacent to the one ground measuring instrument to provide a data communication path.

According to an aspect of the present invention, a first microcomputer unit of the main instrument measures a communication frame for designating a unique number corresponding to a plurality of line measuring instruments according to a predetermined reference, Transmission,

The second microcomputer unit of the branch line measuring instrument sets a unique number assigned by the first microcomputer unit as a unique number when a signal of a predetermined level is received through the second communication line.

According to another preferred aspect of the present invention, the second microcomputer unit of the branch line measuring instrument sets its own unique number and then transmits a communication frame responding to completion of setting to the main instrument via the first communication line.

According to another preferred aspect of the present invention, the first microcomputer unit of the main instrument is configured such that a communication frame for instructing the setting of the unique number to be transmitted is transmitted to all the branch interconnectors via the first communication line.

According to another preferred embodiment of the present invention, the first microcomputer unit of the main instrument sequentially sets the unique numbers one by one, and when there is no communication frame responding to the completion of the setting from the ground wire measuring instrument, Repeat the command to set the unique number.

According to another preferred embodiment of the present invention, when there is no communication frame responding to the completion of the setting of the repetition result setting, the first microcomputer unit of the main instrument checks the number corresponding to the unique number previously set, The total number is recognized, and the automatic number setting is terminated.

The multi-line instrument according to the present invention can automatically assign and set communication specific numbers for a plurality of branch line instruments at the time of installation of the distribution panel, so that it is possible to save a lot of time and man-hour in individual manual setting, There is an effect that can be achieved.

Also, it is possible to check whether the main instrument has completed the setting of each communication specific number, and it is also possible to display the completion of the setting of each communication specific number one by one or collectively through a display device included in the main instrument It is effective.

It is possible to obtain the effect that the main instrument automatically recognizes the total number of branch measuring instruments through the automatic communication specific number setting operation.

It is possible to obtain the effect that the branch line measuring instrument can be set to the unique number one by one without duplication of the unique number setting.

It is possible to obtain the effect that only the branch measuring instrument that has received the input signal of a predetermined level sets and communicates its own communication specific number.

FIG. 1 is a block diagram showing an electrical connection configuration of a power device and a measurement device in a conventional distribution board including a plurality of digital power meters,
2 is a block diagram showing a configuration of a plurality of meters for multiple lines according to a preferred embodiment of the present invention,
3 is a flowchart illustrating a method of automatically setting a unique number of a plurality of meters for multiple lines according to a preferred embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

First, the configuration of a multi-line meter according to a preferred embodiment of the present invention will be described with reference to FIG.

The meter for a multi-line according to the preferred embodiment of the present invention includes a main meter 10a, a plurality of branch line meters 10b, a first communication line RS1, and a second communication line GPIO.

The main measuring instrument 10a has a first microcomputer unit 11 for performing arithmetic processing according to a program and a first communication section 12 for transmitting and receiving data. The main measuring instrument 10a transmits measurement information on the electric quantities of the branch wire circuits received and collected from the plurality of branch wire measuring instruments 10b to the higher-level communication-connected system. Here, the upper system refers to, for example, a supervisory control and data acquisition system (commonly abbreviated as SCADA system), a factory energy management system (FEMS), a building energy management system (BEMS) A monitoring control program, a computer device for executing the monitoring control program, and a monitor.

The first microcomputer unit 11 of the main measuring instrument 10a sequentially sets or increments the unique number (so-called communication specific number) corresponding to the plurality of branch line meters 10b, A configuration command, or a randomly set communication frame. Here, the first microcomputer unit 11 is a means including a central processing unit and a memory for providing a storage or processing space for a data or a processing program. The first microcomputer unit 11 sequentially increases or decreases the unique numbers one by one according to a program stored in advance, A communication frame can be generated and output.

The plurality of branch line meters 10b each have a second microcomputer unit 11a and a second communication unit 12b for performing an arithmetic process according to a program.

The plurality of branch wire measuring instruments 10b measure the amount of electricity such as current and voltage of the branch wire circuit and the four-pole main wire circuit as described above in the description of the prior art with reference to FIG. 1 and transmit measurement information (also called measurement data) (10a).

The second microcomputer unit 11a of the branch line measuring instrument 10b is connected to the main measuring instrument 10a when a signal of a predetermined level (for example, a signal of logic level 1) is received via the second communication line GPIO 1 The microcomputer unit 11 is configured to set the unique number assigned by the microcomputer unit 11 as its own unique number. Here, the second microcomputer unit 11a is a means including a central processing unit and a memory for providing a storage or processing space for a data or processing program, and is provided with a predetermined level (for example, the microcomputer unit 11 sets a unique number assigned by the first microcomputer unit 11 of the main measuring instrument 10a as its own unique number when a signal of a predetermined level (for example, a signal of logic level 1) is received.

The first communication line RS1 includes a plurality of branch line meters 10b and one main line 10b in the form of a muti-drop having a structure in which a branch line measuring instrument 10b and a main measuring instrument 10a are connected to a common line and a common line, And is wired between the meters 10a to provide the main communication path of data between the main meter 10a and the plurality of ground wire meters 10b. The first communication line RS1 may be configured as a serial communication line such as an RS-485 communication line according to an embodiment, but various other communication lines using an industrial communication protocol may be used.

The second communication line GPIO is a signal that is separately connected to the first communication line RS1 between the main measuring instrument 10a and the adjacent line measuring instrument 10b or between one line measuring instrument 10b and another ground line measuring instrument 10b adjacent thereto. Line to provide a data communication path between the main instrument 10a and the adjacent ground measuring instrument 10b or between one ground measuring instrument 10b and another ground measuring instrument 10b.

3 is a block diagram illustrating a program configuration and operation of a multi-line meter according to a preferred embodiment of the present invention and a method for automatically setting a unique number of a multi-line meter according to a preferred embodiment of the present invention. 2 will be referred to as follows.

As shown in Fig. 2, one main meter 10a and a plurality of line measuring instruments 10b are installed in the distribution panel of the installation site, and a first main meter 10a and a plurality of ground line meters 10b It is assumed that the communication line RS1 is provided and the second communication line GPIO is connected between the main measuring instrument 10a and the adjacent line measuring instrument 10b or between one line measuring instrument 10b and another ground line measuring instrument 10b adjacent thereto , The automatic number setting of the instrument for multi-line is performed.

A method of automatically setting a unique number of a meter for a multi-line according to a preferred embodiment of the present invention includes a setting command receiving step S1, a signal level checking step S2, a unique number setting step S4, a level signal outputting step S5, And a unique number setting completion reply step (S6). Here, the order of receiving the setting command (S1) and the signal level confirming step (S2) may be changed in the order.

As shown in FIG. 2, one main meter 10a, a plurality of line measuring instruments 10b, a first communication line RS1 and a second communication line GPIO are installed in the distribution panel of the installation site, and the main meter 10a, The main measuring instrument 10a is connected to the plurality of ground wire measuring instruments 10b connected to the first communication line RS1 through the first communication line RS1 according to the driving of the program stored in advance And the plurality of line measuring instruments 10b transmit the setting command communication frame for instructing the setting of any one of the inherent number 1 to the inherent number N through the second communication unit 12b, (Setting command receiving step (S1)}.

At the same time, according to the driving of the program stored in advance, the main measuring instrument 10a outputs a signal of a predetermined level through the second communication line (GPIO) to the nearest ground measuring instrument 10b among the plurality of ground measuring instruments 10b. Where the predetermined level of the signal may be comprised of a logic level 1 {aka high level} signal according to the preferred embodiment.

The second microcomputer unit 11a of the branch line measuring instrument 10b adjacent to the main instrument 10a checks the input state of the second communication line GPIO (signal level checking step S2).

If it is determined that there is an input of the predetermined level signal through the input terminal connected to the second communication line GPIO (when the signal level is high in the signal level checking step S2), the second micro- The computer unit 11a proceeds to the unique number setting completion check step S3 in the processing operation and if the input of the predetermined level signal is not inputted through the input terminal connected to the second communication line GPIO And the signal level is low in the confirmation step S2), the second microcomputer unit 11a of the branch line measuring instrument 10b proceeds to step S8 of the processing operation.

When the level of the input signal through the second communication line GPIO in the signal level checking step S2 is not the predetermined level (i.e., the logic level "high ", i.e., the logic level" 1 " , The line measuring instrument operates without response in step S8 with respect to the communication frame instructing the setting of the unique number output by the line measuring instrument.

Next, the second microcomputer unit 11a of the branch wire measuring instrument 10b checks whether the setting of the own number is completed according to the program stored beforehand in the unique number setting completion confirmation step (S3). Here, to confirm whether the setting of the own number is completed, it is checked whether the unique number setting data is stored in the memory included in the second microcomputer unit 11a. If the own number setting data exists, the setting of the own number has already been completed If there is no unique number setting data, the setting of the own number has not been performed yet.

If it is confirmed that the own number setting has not yet been performed because there is no unique number setting data in the unique number setting completion check step S3, the second microcomputer unit 11a of the branch line measuring instrument 10b sets the unique number The process advances to step S4 to transmit the unique number according to the setting command communication frame for commanding the setting of the unique number received from the main measuring instrument 10a via the first communication line RS1 to the second microcomputer unit In the memory included in the memory 11a.

Further, the second microcomputer unit 11a of the branch line measuring instrument 10b transmits a signal having a predetermined level (that is, the logic level is high level) through the output terminal of the second communication line GPIO to the next other branch line And outputs it to the input terminal of the measuring instrument 10b (step S5).

 The second microcomputer unit 11a of the branch line measuring instrument 10b is configured to set its own unique number and to output a communication frame responding to completion of setting to the main measuring instrument 10a via the first communication line RS1 .

The second microcomputer unit 11a of the branch line measuring instrument 10b sets a unique number of the second microcomputer unit 11a and transmits a communication frame for responding to the completion of the setting to the first communication line RS1, To the main measuring instrument 10a.

The second microcomputer unit 11a of the branch wire measuring instrument 10b judges whether or not the main instrument 10a has already been set up in the inherent number setting unit completion confirmation step S3, In response to the setting command communication frame for commanding the setting of the unique number received via the first communication line RS1 (step S7).

On the other hand, the first microcomputer unit 11 of the main measuring instrument 10a sequentially sets or increments the unique numbers of 1 to N (where the number of N is determined according to the number of branch measuring instruments) If there is no response from the meter 10b indicating that the completion of the preset wait time has elapsed after waiting for a predetermined waiting time of the communication frame for completing the setting completion, the setting completion is performed even if the unique number setting command is repeated at least a predetermined number of times If there is no communication frame to respond, the number corresponding to the unique number previously set is recognized as the total number (i.e., N) of the line measuring instrument 10b, and the automatic number setting is terminated.

As described above, in the automatic number setting method of the multi-line meter or the multi-line meter according to the present invention, the first microcomputer unit 11 of the main meter 10a corresponds to the plurality of branch line meters 10b And the second microcomputer unit 11a of the branch line measuring instrument 10b is configured to output a communication frame for instructing to set up a predetermined level (for example, level signal is received, the first microcomputer unit 11 sets a unique number assigned by the first microcomputer unit 11 as its own unique number. Therefore, the communication specific number for the plurality of branch line meters 10b can be automatically set and set during the installation of the distribution board, so that it is possible to save a lot of time and man-hour in comparison with the manual setting, It is effective.

10a: main measuring instrument 10b: branch measuring instrument
11: first microcomputer unit
12: first communication section
11a: second microcomputer unit
12b: second communication section
20: Ground measuring instrument (conventional) 30: Main measuring instrument (conventional)

Claims (6)

In a multi-line instrument,
A main meter having a first microcomputer unit and a first communication unit;
A plurality of branch line meters having a second microcomputer unit and a second communication section;
A first communication line for providing a communication path between the main instrument and the ground wire measurement period data; And
And a plurality of second communication lines connected to the main instrument and adjacent ground measuring instruments or to another ground measuring period adjacent to one ground measuring instrument to provide a data communication path,
The second microcomputer unit of the branch line measuring instrument transmits a communication frame for responding to the setting completion to the main instrument via the first communication line after setting its own number,
Wherein the main meter is configured to display, once or collectively, that setting of each unique number is completed through a display device included therein. The method according to claim 1,
Wherein the first microcomputer unit of the main instrument transmits a communication frame in which a unique number corresponding to a plurality of branch line instruments is specified according to a predetermined reference and a setting command is issued,
The second microcomputer unit of the branch wire measuring instrument sets a unique number assigned by the first microcomputer unit as its own unique number when a signal of a predetermined level is received via the second communication line For multi-line measurement. delete The method according to claim 1,
Wherein the first microcomputer unit of the main instrument is configured to transmit a communication frame for setting a unique number to be transmitted to all of the branch line instruments through the first communication line. The method according to claim 1,
Wherein the first microcomputer unit of the main instrument comprises:
And the unique number setting command is repeated at least a predetermined number of times when there is no communication frame for responding to the setting completion from the branch line measuring instrument. 6. The method of claim 5,
Wherein the first microcomputer unit of the main instrument comprises:
And if there is no communication frame responding to the completion of setting the repetition result, recognizes the number corresponding to the unique number previously set up as the total number of the line measuring instruments and ends the automatic setting of the unique number .

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