JP4986940B2 - Electronic indicator - Google Patents

Abstract

The invention provides an electronic type indicator that can simplifies monitored work of electrical parameters of three-phase circuits and is low in cost and great in distinctiveness and is easy to set. The electronic type indicator includes three digital display portions, a digital control portion that outputs display elements for digital display to the three digital display portions, a bar diagram display portion, a bar diagram control portion that outputs the display elements for bar diagram display to the bar diagram display portion. When the display elements input from the digital control portion respectively to the three digital display portions are completely same, ruled display elements are output from the bar diagram control portion.

Description

  The present invention inputs the voltage and current of a three-phase circuit, and calculates and displays the amount of electricity such as voltage, current, power, reactive power, power factor, and frequency of the three-phase circuit based on the voltage and current. The present invention relates to an electronic indicating instrument.

  Conventionally, in an electronic indicator, the voltage and current of an electric circuit are input and the amount of electricity calculated based on the voltage and current is displayed on both one digital display and one bar graph display. Thus, a technique has been proposed in which both direct monitoring using digital values and visual monitoring using bar graph display are compatible (for example, see Patent Document 1).

JP-A-8-136281 (page 6, FIG. 1)

  Conventional electronic indicating instruments only have one digital display and one bar graph display, and when applied to, for example, a three-phase circuit, the voltage, current, power, reactive power of the three-phase circuit In order to display the amount of electricity such as power factor for each phase, the operation of switching between the amount of electricity displayed on the digital display unit and the amount of electricity displayed on the bar graph display means becomes extremely complicated.

  As one of the measures for eliminating such complicated operations, it is conceivable to provide a plurality of digital display units. In this case, a plurality of bar graph display units corresponding to the plurality of digital display units are provided. In such a case, there is a problem that a space for the display unit is large and expensive, and a bar graph or a digital numerical value to be displayed becomes small and display is difficult to see.

  As another countermeasure, it is conceivable to provide one bar graph display unit for a plurality of digital display units. In this case, from among a plurality of display elements digitally displayed on the plurality of digital display units. Since only one display element corresponding to the selected display element is selected and displayed in a bar graph, only the state of one phase of the three-phase circuit can be monitored in the bar graph. It is necessary to switch and display, and there still remains a problem that the monitoring work becomes complicated.

  The present invention has been made to solve the above-described problems in the conventional apparatus, and the work of monitoring the amount of electricity in the three-phase circuit is simplified, is inexpensive, has good visibility, and is set. It is an object of the present invention to provide an electronic indicator instrument that is easy to handle.

  An electronic indicating instrument according to the present invention is provided with a measurement calculation unit that inputs the voltage and current of a three-phase circuit, which is a circuit to be measured, and calculates the amount of electricity of the three-phase circuit based on the input voltage and current; A digital control unit that outputs at least one of the voltage, the current, and the quantity of electricity as a display element for digital display; and the display element output from the digital control unit Each of the display elements is digitally displayed, and a bar graph controller that outputs at least one of the voltage, current, and quantity of electricity as a display element for bar graph display, A bar graph display unit that receives the display element output from the bar graph control unit and displays the display element in a bar graph; When the display elements for the digital display respectively input to the digital display unit are the same display element, the bar graph control unit is a predetermined display element as the display element for the bar graph display. Is output.

  According to the electronic indicating instrument of the present invention, when all the display elements for digital display input from the digital control unit to the three digital display units are the same display element, the bar graph control unit Since a predetermined display element is output as a display element for graph display, when the display elements for three digital displays are the same, the average value of each phase and the total sum of each phase in the display element The desired display elements such as the maximum and minimum values of each phase can be displayed as a bar graph on a single bar graph display, simplifying the work of monitoring the amount of electricity in the three-phase circuit, inexpensive and easy to see In addition, setting is easy.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing an electronic indicating instrument according to Embodiment 1 of the present invention. In FIG. 1, a three-phase three-wire circuit (hereinafter simply referred to as a three-phase circuit) 50 in which a power source (not shown) is Δ-connected is composed of a conductor R, a conductor S, and a conductor T. It is a measurement target on which various electric quantities described later are calculated by the indicating instrument 100. The electronic indicating instrument 100 includes a measurement calculation unit 1, a digital control unit 2, a bar graph control unit 3, an operation unit 4, a set value storage control unit 5, a digital upper display unit 61, and a digital middle display unit 62. And three lower digital display units 63 and one bar graph display unit 7.

  The measurement calculation unit 1 has input terminals connected to the conductor R, the conductor S, and the conductor T of the three-phase circuit 50, and inputs the RS phase voltage and the ST phase voltage, and the R phase current and the T phase current, respectively. On the basis of the voltage and current of TR, the TR phase voltage, the S phase current, the voltage effective value of each phase, the current effective value of each phase, and the total power according to the setting values described later set in the setting value storage control unit 5, The total reactive power, the total apparent power, and the total power factor are calculated, and the electric quantity that is the calculation result is input to the digital control unit 2 and the bar graph control unit 3.

  The operation unit 4 is operated by an operator to set a phase wire type depending on whether the three-phase circuit 50 is a three-phase three-wire type or a three-phase four-wire type, and the electric quantity calculated by the measurement calculation unit 1 The display content or the like to be displayed is switched. The setting value storage control unit 5 stores the setting contents set by the operation unit 4 as a phase wire type setting value 501, a bar graph display setting value 502, and a display contents setting value 201.

  Of these stored set values, the set value storage control unit 5 outputs the phase wire type set value 501 and the bar graph display set value 502 to the bar graph control unit 3, and displays the display content set value 503 as a digital control unit. Output to 2. Here, the phase wire type setting value 501, the bar graph display setting value 502, and the display content setting value 201 include numerical values or setting contents other than numerical values.

  The digital control unit 2 includes the voltage and current input to the measurement calculation unit 1, the voltage effective value of each phase calculated by the measurement calculation unit 1, the current effective value of each phase, total power, total reactive power, total Based on the display content setting value 503 set by the operator by the operation unit 4 and stored in the set value storage control unit 5, an electric quantity including the apparent power and the total power factor is input from the measurement calculation unit 1. The amount of electricity selected from the selected amounts of electricity is output as a display element for digital display by a digital display unit 6 to be described later, and includes a digital upper control unit 201, a digital middle control unit 202, and a digital lower control unit 203. With.

  The bar graph control unit 3 receives the above-described electric quantity output from the measurement calculation unit 1, the phase wire set value 501 and the bar graph display set value 502 output from the set value storage control unit 5. The outputs from the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 in the digital control unit 2 are input, and display elements for bar graph display are output by the bar graph display unit 7 described later. To do.

  The digital upper display unit 61, the digital middle display unit 62, and the digital lower display unit 63 are provided corresponding to the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 of the digital control unit 2, respectively. In addition, the electric quantity as a display element output from each of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 is digitally displayed. The bar graph display unit 7 displays the electric quantity as a display element output from the bar graph control unit 3 in an analog manner using a bar graph.

  Next, the operation will be described. The three-phase circuit 50 is a three-phase three-wire system in this embodiment, and an operator sets a three-phase three-wire system as a phase wire type by the operation unit 4, and sets the set value in the set value storage control unit 5. This is stored as a phase wire set value 501. The measurement calculation unit 3 follows the phase wire type set value 501 stored in the set value storage control unit 5, and the values of the RS phase voltage and ST phase voltage input from the three-phase circuit 50, and the R phase current and T Based on the value of the phase current, the value of the TS phase voltage and the value of the S phase current are obtained by calculation, and the voltage effective value of each phase, the current effective value of each phase, the total power, the total reactive power, the total apparent power The total power factor is obtained by calculation.

  The voltage and current values input to the measurement calculation unit 1 and the calculated amount of electricity are output to the digital control unit 4 and the bar graph control unit 9. In the digital control unit 4, based on information from the display content set value 503 of the set value storage control unit 2, the electric quantity to be displayed on the corresponding digital upper display unit 61, digital middle display unit 62, and digital lower display unit 63, respectively. Are output from the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 as display elements, respectively. The digital upper display unit 61, the digital middle display unit 62, and the digital lower display unit 63 are input with respective display elements output from the corresponding digital upper control unit 201, digital middle control unit 202, and digital lower control unit 203, respectively. These display elements are digitally displayed.

  In the case of the first embodiment, for example, the digital upper stage control unit 201 outputs the value of the RS phase voltage as a display element and causes the digital upper stage display unit 61 to digitally display the value, and the digital middle stage control unit 202 serves as a display element. The ST phase voltage value is output and the digital upper stage display unit 62 digitally displays the value, and the digital lower stage control unit 203 outputs the TR phase voltage value as a display element and causes the digital upper stage display unit 63 to digitally display the value. .

  Of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203, any one or two outputs the value of any phase voltage, and the other two or one is any The display content setting value of the set value storage control unit 5 can be arbitrarily set by operating the operation unit 4 so as to output the value of the phase current. In this case, the digital upper display unit 61 and the digital middle display The unit 62 and the digital lower display unit 63 digitally display the value of any one of the phase voltages corresponding to the display elements input from the digital control unit 2 and the other two. One or one will digitally display the value of any phase current.

  Simultaneously with the digital display of the display elements output from the digital control unit 2 described above, the bar graph display unit 3 outputs the phase line set value 501 and the bar graph set value 502 from the set value storage control unit 2. In addition, based on outputs relating to digital display contents from the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 of the digital control unit 2, a predetermined amount of electricity input from the measurement calculation unit 3 Is selected as described later, and the selected amount of electricity is output as a display element for displaying a bar graph. The bar graph display unit 7 displays the display elements output from the bar graph control unit 3 in an analog manner using a bar graph.

  FIG. 2 is a flowchart of the bar graph output determination in the bar graph control unit 3 when the phase wire type set value 501 stored in the set value storage control unit 5 is set to the three-phase three-wire type. . This process is repeated at predetermined time intervals. In FIG. 2, in step S111, it is determined whether or not a digital display switching operation has occurred by the operation unit 2. If a digital display switching operation has occurred, the determination becomes YES and the process proceeds to step S112. If no switching operation has occurred, the process ends with NO. In step S112, first, display elements output from the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are compared and determined.

  As a result of the determination in step S112, if all the display elements of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are voltages, or if all the display elements are not current, NO The process proceeds to step S113, and the electric quantity based on the bar graph display set value 502 stored in the set value storage control unit 2 is output to the bar graph display unit 7 as a display element for displaying the bar graph, and the process is performed. finish. The bar graph display unit 7 displays the output electric quantity as the display element in a bar graph. On the other hand, if all the display elements are voltages as a result of the determination in step S112, or if all the display elements are currents, the process proceeds to step S114, where the display elements are voltage or current. Are compared.

  If all the display elements are current as a result of the determination in step S114, the determination is NO, and the process proceeds to step S115. In step S115, the bar graph control unit 3 displays the S phase current value calculated based on the R phase current value and the T phase current value input to the measurement calculation means 1 as a display element for displaying the bar graph. Output and finish the process. The bar graph display unit 7 displays the S-phase current value as a display element input from the bar graph control 3 in an analog manner using a bar graph.

  If all the display elements are voltages as a result of the determination in step S114, the determination is YES, and the process proceeds to step S116. In step S116, the bar graph control unit 3 displays a bar phase display of the TR phase voltage value calculated based on the RS phase voltage value and the ST phase voltage value input to the measurement calculation unit 1. And finishes the process. The bar graph display unit 7 displays the value of the TR phase voltage as a display element input from the bar graph control 3 in an analog manner using a bar graph.

  Next, the case where the three-phase circuit 50 is a three-phase four-wire system in which the power source is Y-connected will be described. In this case, the operator operates the operation unit 4 to set the phase / wire system to the three-phase / four-wire system, and causes the set value storage control unit 5 to store the set value as the phase / wire system set value 501.

  The measurement calculation unit 1 has input terminals connected to the conductor R, the conductor S, and the conductor T of the three-phase circuit 50, respectively, the R-phase voltage, the S-phase voltage, the T-phase voltage, the R-phase current, and the S-phase current. T-phase currents are respectively input, and based on the input voltage and current values, the effective voltage value and average voltage of each phase as a quantity of electricity, the effective current value and average current of each phase, and the power of each phase The amount and total power, the reactive power and total reactive power of each phase, the apparent power and total apparent power of each phase, the power factor of each phase and the total power factor are calculated. The calculation result and the input voltage and current values are input to the digital control unit 2 and the bar graph control unit 3.

  When the three-phase circuit 50 is a three-phase four-wire system in which the power supply is Y-connected, for example, the digital upper stage control unit 201 outputs the value of the R phase voltage as a display element for digital display and outputs the digital upper stage display unit 61. The digital middle stage control unit 202 outputs the value of the S-phase voltage as a display element for digital display and causes the digital upper stage display unit 62 to digitally display the value. The digital lower stage control unit 203 The value of the phase voltage is output as a display element for digital display, and the digital upper stage display unit 63 displays the value digitally.

Of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203, any one or two outputs the value of any phase voltage, and the other two or one is any The display content set value of the set value storage control unit 5 can be arbitrarily set by operating the operation unit 4 so as to output the value of the phase current. In this case, either one or two of the digital upper display unit 61, the digital middle display unit 62, and the digital lower display unit 63 correspond to the values of the display elements input from the digital control unit 2. The value of the phase voltage is displayed, and the other two or one displays the value of any phase current digitally.

  Simultaneously with the digital display of the display elements output from the digital control unit 2 described above, the bar graph display unit 3 outputs the phase line set value 501 and the bar graph set value 502 from the set value storage control unit 2. In addition, based on outputs relating to digital display contents from the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 of the digital control unit 2, a predetermined amount of electricity input from the measurement calculation unit 3 Is selected as described later, and the selected amount of electricity is output as a display element for displaying a bar graph. The bar graph display unit 7 displays the display element as a predetermined amount of electricity output from the bar graph control unit 3 in an analog manner using a bar graph.

  FIG. 3 is a flowchart of the bar graph output determination in the bar graph control unit 3 when the phase wire type set value 501 stored in the set value storage control unit 5 is set to the three-phase four-wire type. . This process is repeated at predetermined time intervals. In FIG. 3, in step S101, it is determined whether or not a digital display switching operation has occurred by the operation unit 2. If a digital display switching operation has occurred, the determination becomes YES and the process proceeds to step S102. If no switching operation has occurred, the process ends with NO. In step S102, first, the display elements of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are compared and determined.

  If all the display elements of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are not identical as a result of the determination in step S102, the determination is NO and the process proceeds to step S103 to store the set value. The amount of electricity based on the bar graph display setting value 502 stored in the control unit 2 is output as a display element for bar graph display, and the process is terminated. The bar graph display unit 7 displays the amount of electricity as a display element output from the bar graph control unit 3 in a bar graph. On the other hand, if all the display elements are the same as a result of the determination in step S102, the determination is YES and the process proceeds to step S104 to determine whether the display element is a voltage or a current.

  If the result of determination in step S104 is that the display element is other than voltage or current, the determination is NO and processing proceeds to step S105. In step S105, the total values of the display elements of the digital upper stage control unit 201, the digital middle stage control unit 202, and the digital lower stage control unit 203 are output, and the process ends. For example, if the display elements of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are the power factors of each phase, the bar graph control unit 3 displays the total power factor of the entire three-phase circuit as a display element. Output as. The bar graph display unit 7 displays the total power factor as a display element output from the bar graph control 3 in an analog manner using a bar graph.

  If the result of determination in step S104 is that the display element is voltage or current, the answer is YES and processing proceeds to step S106. In step S106, the bar graph control unit 3 displays the average value of the voltage or current of each phase, which is a display element of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203, in a bar graph. Output as a display element and end processing. The bar graph display unit 7 displays the average value of voltage or current as a display element output from the bar graph control unit 3 in an analog manner using a bar graph.

  As described above, according to the electronic indicator according to the first embodiment of the present invention, the electric quantity of the three-phase circuit is displayed on the three digital display units by displaying the electric quantity of each phase of the same element. The values of the three digital displays can be visually monitored with one bar graph, and the trouble of displaying all the digital numerical values on the bar graph while sequentially switching them can be saved. In addition, since the amount of electricity displayed on the bar graph display unit is automatically determined from the amount of electricity displayed digitally, the setting for displaying the bar graph can be simplified.

Embodiment 2. FIG.
Next, an electronic indicating instrument according to Embodiment 2 of the present invention will be described. FIG. 4 is a flowchart of the bar graph output determination in the bar graph control unit 9 of the electronic indicating instrument according to the second embodiment of the present invention. Others are the same as those in the first embodiment.

  In FIG. 4, in step S121, it is determined whether or not a switching operation of the display content to be displayed on the digital display unit 6 has occurred by the operation unit 4, and if a switching operation has occurred, the determination becomes YES. Proceed to S122. If no switching operation has occurred, the determination is NO and the process is terminated. In step S122, the display elements of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are compared and determined. If all the display elements are not the same as a result of the determination in step S122, the result is NO, and the process proceeds to step S123, where the display elements are output according to the bar graph display set value 503 stored in the set value storage control unit 5. The process ends. The bar graph display unit 7 displays a bar graph of the output display element.

  As a result of the determination in step S122, when the digital display elements output from the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are all the same display elements, that is, for example, the digital upper control unit 201 Is the R phase voltage, the digital middle stage control unit 202 is outputting the S phase voltage, and the digital lower stage control unit 203 is outputting the T phase voltage as display elements, the process proceeds to step S124.

  In step S124, the maximum value and the minimum value of the same display elements are obtained, and both values are output to the bar graph display unit 7 as display elements for displaying the bar graph, and the process ends. The bar graph display unit 7 displays a maximum value and a minimum value as the output display elements in a bar graph.

  As described above, according to the electronic indicator according to the second embodiment of the present invention, the electric quantity of the three-phase circuit is displayed on the three digital display units, and the electric quantity of each phase of the same element is displayed. The maximum value and the minimum value of the digital display can be visually monitored with one bar graph, and the trouble of displaying all the digital numerical values on the bar graph while sequentially switching can be saved.

Embodiment 3 FIG.
Next, an electronic indicating instrument according to Embodiment 3 of the present invention will be described. FIG. 5 is a block diagram showing an electronic indicator instrument according to Embodiment 3 of the present invention, and FIG. 6 is a flowchart of bar graph output determination in the bar graph control unit. This process is repeated at predetermined time intervals. In FIG. 5, the bar graph display switching timer 8 connected to the bar graph control unit 3 controls the switching of the bar graph display in the bar graph display unit 7 as described later. Other configurations are the same as those of the first embodiment.

  Next, the operation will be described. In FIG. 6, in step S131, it is determined whether or not the digital display content has been switched by the operation of the operation unit 2 by the operator. If the digital display content has been switched, the determination is YES and step S132 is performed. Proceed to In step S132, it is determined whether the display elements of the digital upper control unit 201, the digital middle control unit 202, and the digital lower control unit 203 are the same.

  If all the display elements on the digital display unit 6 are not the same as a result of the determination in step S132, the result is NO, and the process proceeds to step S133, where the display elements stored in the bar graph display set value 203 of the set value storage control unit 2 The value of is output and the process ends. Thereby, the bar graph display unit 7 displays the output display element as a bar graph.

  As a result of the determination in step S132, if all the digital display elements output from the digital upper stage control unit 401, the digital middle stage control unit 402, and the digital lower stage control unit 403 are the same elements, the determination is YES, and the process proceeds to step S134. In step S134, the bar graph control unit 3 activates the bar graph display switching timer 10 and proceeds to step S135, outputs the value of the display element of the first phase, for example, the R phase, to the bar graph 8 and ends the process. As a result, the bar graph display unit 7 displays the input display element of the first phase as a bar graph.

  In this state, if the result of determination in step S131 is that digital display switching has not occurred, the determination is NO and processing proceeds to step S136. The bar graph display switching timer 10 outputs a bar graph switching timing after a predetermined time set after being started in step S134. In step S136, it is determined whether or not the bar graph display switching timing has been generated. To do. If the result of determination in step S136 is that the bar graph display switching timing has occurred, the determination is YES, the process proceeds to step S137, the phase of the bar graph display element is switched, and the next phase, for example, the S phase display element is output. To finish the process. As a result, the bar graph display unit 7 displays the inputted next phase display element as a bar graph.

  Next, if the result of determination in step S131 again from this state is that switching of digital display has not occurred, NO is determined, and processing proceeds to step S136. The bar graph display switching timer 10 outputs the bar graph switching timing again after a predetermined time from the output of the previous bar graph switching timing. In step S136, it is determined whether or not the bar graph display switching timing has been generated. If the result of determination in step S136 is that a bar graph display switching timing has occurred, the determination is YES, the process proceeds to step S137, the phase of the bar graph display element is switched, and the next phase relative to the previous phase, for example, the display of the T phase is displayed. Output the element and finish the process. As a result, the bar graph display unit 7 displays the inputted next phase display element as a bar graph.

  As described above, according to the electronic indicating instrument according to the third embodiment of the present invention, the display of the bar graph display unit 7 can be performed by switching each phase sequentially every predetermined time, and the electric power of the three-phase circuit can be changed. The electric quantity of each phase of the same element can be displayed on three digital displays, and the values of these three digital displays can be visually monitored with a single bar graph. It is possible to save the trouble of displaying.

It is a block diagram which shows the electronic indicator instrument by Embodiment 1 of this invention. It is a flowchart of the bar graph output determination at the time of three-phase three-wire circuit measurement in the electronic indicator instrument by Embodiment 1 of this invention. It is a flowchart of the bar graph output determination at the time of three-phase four-wire circuit measurement of the electronic indicator by Embodiment 1 of this invention. It is a flowchart of the bar-graph output determination of the electronic indicator meter by Embodiment 2 of this invention. It is a block diagram which shows the electronic indicator instrument by Embodiment 3 of this invention. It is a flowchart of the bar graph output determination of the electronic indicator which concerns on Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement calculating part 2 Digital control part 201 Digital upper stage control part 202 Digital middle stage control part 203 Digital lower stage control part 3 Bar graph control part 4 Operation part 5 Setting value memory | storage control part 501 Phase wire type setting value 502 Bar graph display setting value 503 Display contents set value 6 Digital display 61 Digital upper display 62 Digital middle display 63 Digital lower display 7 Bar graph display

Claims (8)

  A voltage calculation unit that calculates the amount of electricity of the three-phase circuit based on the input voltage and current and inputs the voltage and current of the three-phase circuit that is the circuit to be measured; the voltage, the current, and the electric A digital control unit that outputs at least one of the quantity as a display element for digital display, and the display element output from the digital control unit is input, and each of these display elements is digitally displayed 3 Two digital display units, a bar graph control unit that outputs at least one of the voltage, current, and electric quantity as a display element for displaying a bar graph; and the bar graph control unit that outputs the bar graph control unit A bar graph display unit for inputting a display element and displaying the display element in a bar graph, before being input from the digital control unit to the three digital display units. When the display elements for digital display are all the same display element, the bar graph control unit outputs a predetermined display element as the display element for the bar graph display. Type indicating instrument.   When the three-phase circuit is a three-phase three-wire circuit, the bar graph control unit is configured such that the display element for the digital display input from the digital control unit to the three digital display units is the three-phase circuit. 2. The electronic indicating instrument according to claim 1, wherein the TR phase voltage is output as the predetermined display element if the phase phase voltage is an RS phase voltage, an ST phase voltage, and a TR phase voltage.   When the three-phase circuit is a three-phase three-wire circuit, the bar graph control unit is configured such that the display element for the digital display input from the digital control unit to the three digital display units is the three-phase circuit. 2. The electronic indicating instrument according to claim 1, wherein if the current is an R-phase current, an S-phase current, and a T-phase current of a phase circuit, the S-phase current is output as the predetermined display element.   When the three-phase circuit is a three-phase four-wire circuit, the bar graph control unit is configured such that the display element for the digital display input from the digital control unit to the three digital display units is the three-phase circuit. 2. The electronic indicating instrument according to claim 1, wherein if it is a voltage of each phase of the phase circuit, an average value of the voltage of each phase is output as the predetermined display element.   When the three-phase circuit is a three-phase four-wire circuit, the bar graph control unit is configured such that the display element for the digital display input from the digital control unit to the three digital display units is the three-phase circuit. 2. The electronic indicating instrument according to claim 1, wherein if it is a current of each phase of the phase circuit, an average value of the current of each phase is output as the predetermined display element.   When the three-phase circuit is a three-phase four-wire circuit, the display elements for the digital display respectively input from the digital control unit to the three digital display units are the power of each phase of the three-phase circuit. And the reactive power, the apparent power, and the power factor, the bar graph control unit sums the display elements for the digital display respectively input to the three digital display units. The electronic indicating instrument according to claim 1, wherein the electronic indicator is output as the predetermined display element.   In the bar graph control unit, the display elements for the digital display respectively input from the digital control unit to the three digital display units are voltage, current, power and reactive power of each phase of the three-phase circuit. If it is any one of the apparent power and the power factor, the maximum value and the minimum value among the display elements for the digital display respectively input to the three digital display units are set as the predetermined value. 2. The electronic indicator as claimed in claim 1, wherein the electronic indicator is output as a display element. A display timer for bar graph display is provided, and the display elements for the digital display respectively input from the digital control unit to the three digital display units are the same display elements in each phase of the three-phase circuit. In some cases, the bar graph control unit is configured to display a bar graph of each phase corresponding to the same display element in each phase displayed digitally based on the switching timing output from the switching timer. 2. The electronic indicating instrument according to claim 1, wherein the display elements are sequentially switched and output for each phase.

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