JP6116493B2 - Electronic indicator - Google Patents

Description

  The present invention relates to an electronic indicating instrument used for voltage monitoring in a power system.

As a conventional technology for monitoring the amount of electricity, 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 the digital display and bar graph display. There has been proposed an electronic indicating instrument that is compatible with both monitoring and visual monitoring by bar graph display (see, for example, Patent Document 1).
In addition, as a technique for making it easier to see the display of the measured value when the deviation between the measured value and the set value is large in the controller, a display unit that has a plurality of display digits and displays the measured value, and a display drive unit that drives the display unit And a setting section for setting the number of display digits. When the measured value is in the approximate display band, the lower digit is left blank or the sign is fixedly displayed, and the measured value is in the all-digit display band. Has proposed a display digit number variable device that controls the display unit so that variable display is possible up to the lower digits (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2010-8269 (second page, FIG. 1) Japanese Utility Model Publication No. 5-25501 (2nd page, Fig. 1-3)

An indicator is used for voltage monitoring of a power receiving / distributing system, a feeder system, and a load system downstream from a power receiving point of a factory, a building or the like in the power system. As the indicating instrument, a mechanical indicating instrument that displays by a pointer and an electronic indicating instrument that displays by a digital display such as a liquid crystal display device are generally used as shown in Patent Document 1, and the electronic indicating instrument is It is becoming mainstream.
The voltage measurement value of the electronic indicator installed in the same system does not completely match even if the voltage is the same. This is due to the solid error of the instrument transformer and electronic indicator used in combination. For this reason, there is a problem that the administrator feels that it is abnormal even though it is normal.

Voltage monitoring using a mechanical indicator is low in accuracy and is indicated by a pointer, so the voltage trend and correlation are checked, and variations in measured values of the same system do not pose a problem. It was. On the other hand, since the electronic indicator is highly accurate and the display value is digitally displayed, the variation in the measurement value of the same system appears on the surface.
Further, since the display value is detailed, there is a problem that the value is likely to fluctuate and it is difficult to read and record the display value.

In the above-mentioned Patent Document 2, the lower digits including the decimal point of the display unit change at high speed, and the display is difficult to see. Alternatively, a rough display band to be displayed instead of the code is set.
When this is applied to an electronic indicating instrument, reading and recording of the display value becomes easy in the general display band, but the measurement accuracy deteriorates. In addition, in the all-digit display band, the problem of variation in measured values of the same system cannot be solved.

  This invention was made to solve the above problems, and in an electronic indicator used in a voltage monitoring system in a power system, even in a state where there is a variation in measured values due to solid errors, etc. It is an object of the present invention to obtain an electronic indicating instrument that can easily monitor voltage without an administrator erroneously judging normality as abnormal.

  An electronic indicating instrument according to the present invention is an electronic indicating instrument used for voltage monitoring in a power system, and takes the voltage of an electric circuit to be measured directly or via an instrument transformer and calculates an effective voltage value. A measurement calculation unit that performs measurement, a display unit that displays the measurement results, a condition setting unit that sets the normal voltage range and a set value that is a guide for normality, and whether the measurement value calculated by the measurement calculation unit is within the normal voltage range A determination unit that determines whether or not, and a display control unit that controls the display content on the display unit, and the display control unit determines the set value when the determination unit determines that the measured value is in the normal voltage range. When it is determined that the voltage is not within the normal voltage range, the measured value is displayed on the display unit.

  According to the electronic indicator of the present invention, the display control unit determines the set value when the determination unit determines that the measurement value is in the normal voltage range, and the measurement value when it is determined that the measurement value is not within the normal voltage range. Since it is displayed on the display unit, it is easy to determine the abnormality when the measured value is outside the normal voltage range, and the display is constant when it is within the normal range, so the administrator is normal Nevertheless, it is possible to prevent misperception that it is judged as abnormal, and it is easy to read and record.

It is a systematic diagram which shows an example of the electric power system which installed the electronic indicator instrument in Embodiment 1 of this invention. It is a block diagram which shows the internal structure of the electronic indicator instrument in Embodiment 1 of this invention. It is a flowchart which shows the operation | movement which displays the measured value of the electronic indicator in Embodiment 1 of this invention. FIG. 3 is a diagram showing a display screen when the measured voltage is in a normal voltage range in the display unit of FIG. 2. FIG. 3 is a diagram showing a display screen when the measured voltage is not in a normal voltage range in the display unit of FIG. 2. It is a flowchart which shows the operation | movement which displays the measured value of the electronic indicator in Embodiment 2 of this invention. It is a figure which shows the display screen of the display part of the electronic indicator in Embodiment 3 of this invention. It is a figure which shows the display screen of the display part of the electronic indicator in Embodiment 4 of this invention. It is a block diagram which shows the internal structure of the electronic indicator meter in Embodiment 5 of this invention. It is a flowchart which shows the operation | movement which displays the measured value of the electronic indicator in Embodiment 5 of this invention. It is a flowchart which shows the detail of one part step in FIG.

Embodiment 1 FIG.
Hereinafter, the electronic indicator in Embodiment 1 of this invention is demonstrated based on FIGS.
FIG. 1 is a system diagram showing an example of a power system having a load system and having an electronic indicator as a monitoring device. For the power distribution system, feeder system, and load system downstream from the power receiving point 1 of the power equipment of power users in factories, buildings, etc., use multiple electronic indicating instruments to monitor the voltage by reading it into the monitoring device. It is carried out.
The power receiving transformer 2 of the power receiving and distributing system, for example, steps down 22 kV to 6.6 kV, and an electronic indicator 4 for inputting the output of the transformer 3 is installed on the primary side. The voltage on the primary side of the power receiving transformer 2 is measured and displayed by the formula indicating instrument 4.
Similarly, on the secondary side of the power receiving transformer 2, an electronic indicator meter 6 for inputting the output of the instrument transformer 5 is installed, and the voltage on the secondary side of the power transformer 2 is measured by the electronic indicator meter 6. Displayed.

  The feeder transformer 7 of the feeder system, for example, steps down 6.6 kV to 200 V and supplies it to the load system. On the secondary side of the feeder transformer 7, an electronic indicator 9 for inputting each output of the instrument transformer 8 is installed, and the secondary indicator voltage is measured and displayed by the electronic indicator 9. .

In the load system, a plurality of loads are connected in parallel to the secondary side of the feeder transformer 7. As an example of the load, for example, an air conditioner (air conditioner) 10, an illumination 11, and a motor 12 are shown. For each of these loads, electronic indicator meters 13, 14, and 15 for inputting the output of an instrument transformer (not shown) are installed, and the voltage of each system is set by the electronic indicator meters 13, 14, and 15 respectively. Is measured and displayed.
Note that the instrument transformer may be omitted depending on the voltage of the circuit under measurement, and the voltage of the circuit under measurement may be directly taken into the electronic indicating instrument.

FIG. 2 is a block diagram showing the configuration of the electronic indicator in the first embodiment. Since each electronic indicating instrument described in FIG. 1 is basically configured in the same manner, in the following description, the electronic indicating instrument in the first embodiment will be described as an electronic indicating instrument 20.
The electronic indicator 20 receives the voltage of the circuit under measurement or the output of the transformer for the instrument that has stepped down the voltage of the circuit under measurement, calculates a voltage effective value, and the calculation result of the measurement calculator 21 A display control unit 22 that controls the display of the display, a display unit 23 that displays the measurement result, a condition setting unit 24 that sets the normal voltage range and the set value, and a determination unit 25 that determines whether the value of the calculation result is normal. And a rated voltage setting unit 26 for setting the rated voltage.
Note that the rated voltage setting unit 26 is not essential in the scope of the first embodiment, so the description thereof will be omitted here, and the details will be described in the second embodiment.

Next, the detail of each part is demonstrated.
The display control unit 22 has two display modes, an operation mode and a monitoring mode, and both modes can be switched. Among these monitoring modes, a determination unit 25 for determining whether the measurement value is normal or abnormal is provided.
In the condition setting unit 24, a “normal voltage range” value that is an allowable range of the voltage of the circuit to be measured and a “set value” that is used as a standard for the normal voltage are prepared in advance.
The voltage input in the measurement calculation unit 21 is calculated as an effective value, and the voltage value obtained by the calculation is sent to the display control unit 22 as a “measurement value”. On the other hand, the “setting value” set in the condition setting unit 24 can be set by the user. For example, a rated voltage may be set as the setting value. In the present embodiment, the “user setting value” is referred to as what is set by the user.

  In the case of the operation mode, the “measurement value” obtained by the measurement calculation unit 21 is displayed on the display unit 23. In the case of the monitoring mode, the determination unit 25 determines whether the measurement value obtained by the measurement calculation unit 21 is normal or abnormal. As the determination condition at this time, the “normal voltage range” set in the condition setting unit 24 is used. If the measurement value obtained by the measurement calculation unit 21 is within the normal voltage range, it is determined as normal. The “user set value” set by the condition setting unit 24 is displayed on the display unit 23. If it is outside the normal voltage range, it is determined that there is an abnormality, and the “measured value” obtained by the measurement calculation unit 21, that is, the value of the abnormality outside the normal voltage range is displayed as it is on the display unit 23.

Next, the operation in the monitoring mode will be further described with reference to the flowchart of FIG.
First, in the first step S51 (hereinafter abbreviated as S51), the voltage input in the measurement calculation unit 21 is calculated as an effective value, and the calculation result is sent to the display control unit 22 as a “measurement value”.
Next, in S52, the display control unit 22 determines whether the display mode is the operation mode or the monitoring mode, and transitions depending on the stay mode.

If not in the monitoring mode, that is, in the operation mode, the process proceeds to S55, and the “measurement value” obtained by the measurement calculation unit 21 is displayed on the display unit 23.
In the case of the monitoring mode, the process proceeds to S53, and the determination unit 25 determines whether or not the measurement value obtained by the measurement calculation unit 21 is within the normal voltage range set by the condition setting unit 24.
If it is determined that the voltage is within the normal voltage range, the process proceeds to S54, and the “user set value” set by the condition setting unit 24 is displayed on the display unit 23.
If it is determined in S53 that it is out of the normal range, the process proceeds to S55, and the “measurement value” obtained by the measurement calculation unit 21 is displayed on the display unit 23.

Next, a display screen when voltage is measured with the electronic indicator in the first embodiment will be described. FIG. 4 is a diagram illustrating an example of a display screen. The electrical system is a three-phase three-wire system of a 6.6 kV system, the measured value of the RS phase is 6589 V, the measured voltage of the ST phase is 6588 V, the measured voltage of the TR phase is 6585 V, and the normal voltage range is 6534 V to 6666 V (6600 V ± 1%) is a display screen example in which the measured voltage is within the normal voltage range when the user setting value is 6600V. (A) of the figure is a display screen of the operation mode, and (b) shows a display screen of the monitoring mode.
In the operation mode, the measured voltage, that is, the measured value is displayed as shown in (a).
In the monitoring mode, since the measured value of each phase is within the normal voltage range, the user set value is displayed as shown in (b).

FIG. 5 shows a case where the setting conditions in the electrical method and condition setting unit 24 are the same as those in FIG. 4, the measured value of the RS phase is 6530V, the measured voltage of the ST phase is 6588V, and the measured voltage of the TR phase is 6585V. That is, this is a display screen example when the measurement value obtained by the measurement calculation unit 21 is outside the normal voltage range (in this example, the RS measurement value is below the normal voltage range). (A) is a display screen of operation mode, (b) shows the display screen of monitoring mode.
In the operation mode, the measured value is displayed as shown in (a). In the monitoring mode, since the measured voltage of the RS phase is outside the normal voltage range, the RS phase display is set to the measured value 6530V as shown in (b), and the ST phase and the TR phase are within the normal voltage range. 6600V is displayed.

By using such a display, in the monitoring mode, if the display screen is a user set value, it can be confirmed that it is normal, and if anything other than the user set value is displayed, it is easily confirmed that it is abnormal. be able to.
In the above description, the measured value is displayed only for the phase outside the normal voltage range. However, if any phase is outside the normal voltage range, the measured value may be displayed for all phases. .

  As described above, according to the electronic indicating instrument according to the first embodiment, the electronic indicating instrument is used for voltage monitoring in the electric power system, and the voltage of the circuit to be measured is directly or directly connected to the measuring instrument. The measurement calculation unit that calculates the captured voltage effective value, the display unit that displays the measurement results, the condition setting unit that sets the normal voltage range and the set value that is a guide for normality, and the measurement calculation unit A determination unit that determines whether or not the measured value is in a normal voltage range, and a display control unit that controls display content on the display unit, and the display control unit has a measurement value in the normal voltage range in the determination unit If the measured value is not within the normal voltage range, the measured value is displayed on the display unit, so it is easy to determine if the measured value is outside the normal voltage range. If it is within the normal range, There to become constant, the administrator can be prevented from false positives as it is determined that despite normal or abnormal, the reading and recording easy.

Embodiment 2. FIG.
FIG. 6 is a flowchart showing an operation of displaying the measurement value of the electronic indicator in the second embodiment. The configuration of the electronic indicator is the same as that in FIG. 2 of the first embodiment. However, the rated voltage setting unit 26 that can be omitted in the first embodiment is essential. In the rated voltage setting unit 26, the rated voltage of the circuit to be measured is set. The screen of the display unit is the same as in the first embodiment. In the following, explanation of equivalent parts is omitted, and explanation will be made mainly on the differences.

In FIG. 6, in S <b> 61, the measurement calculation unit 21 calculates the measurement value by calculating the effective value of the input voltage, and the calculated measurement value is sent to the display control unit 22.
Next, in S62, the display control unit 22 determines whether the display mode is the operation mode or the monitoring mode. If not in the monitoring mode, the process proceeds to S65, and the measurement value is displayed on the display unit 23 as in the first embodiment.
In the case of the monitoring mode, the process proceeds to S63, where the determination unit 25 determines whether or not the measurement value obtained by the measurement calculation unit 21 is within the normal voltage range, and if it is not within the normal voltage range, the process proceeds to S65.

  When the voltage is within the normal voltage range, the rated voltage set by the rated voltage setting unit 26 shown in FIG. 2 is automatically set as the set value of the condition setting unit 24 and displayed on the display unit 23. That is, what is displayed on the display unit 23 is the rated voltage value. In order to use the electronic indicator, it is necessary to set a rated voltage suitable for the measurement point, and this value is used as a set value.

  In the above description, the normal voltage range is set by the user. However, the normal voltage range is automatically calculated from the measurement accuracy of the electronic indicator that is known in advance and the rated voltage value set in the rated voltage setting unit 26. You may do it.

  As described above, according to the electronic indicator of the second embodiment, in addition to the configuration of the first embodiment, the electronic indicator further includes a rated voltage setting unit that sets a rated voltage according to the voltage of the circuit to be measured. Since the rated voltage value set in the rated voltage setting unit is used as the setting value in the condition setting unit, and the determination unit determines that the measured value is in the normal voltage range, the rated voltage value is displayed. In addition to the effects of the first embodiment, it is possible to prevent troublesomeness due to an increase in setting and simplify the setting.

  In addition, the normal voltage range set by the condition setting unit is automatically set based on the measurement accuracy of the electronic indicator and the rated voltage value set by the rated voltage setting unit, so the setting can be further simplified. In addition, when a plurality of electronic indicating instruments are installed in the power system, a certain display can be performed within the measurement accuracy.

Embodiment 3 FIG.
FIG. 7 is a display screen example of the monitoring mode of the electronic indicator in the third embodiment. The configuration of the electronic indicator is the same as that in FIG. 2 of the first embodiment. Below, it demonstrates centering on difference with Embodiment 1. FIG.

In the present embodiment, in the monitoring mode, when the measured value is outside the normal voltage range, in addition to displaying the measured value as described in FIG. 5 of the first embodiment, Judgment information is added. As an example of the abnormality determination information, a unique display of “HIGH” is added when the measured value exceeds the normal voltage range, and “LOW” is added when the measured value falls below the normal voltage range, and the measured value is displayed alternately.
FIGS. 7A and 7B are monitor mode screens. FIG. 7A is a display screen on which measurement values are displayed as they are, and FIG. 7B is a display screen to which abnormality determination information is added. In this example, “LOW” is displayed because the measurement voltage of the RS phase is below the normal voltage range. This (a) screen and (b) screen are displayed alternately.

  As described above, according to the electronic indicator of the third embodiment, when the determination unit determines that it is not within the normal voltage range, the measured value and the unique display indicating abnormality are alternately displayed. Therefore, by adding the abnormality determination information, for example, it becomes obvious at a glance whether the abnormality is due to a voltage increase or an abnormality due to a voltage drop. Further, the visibility is increased by alternate display, and the abnormality determination in voltage monitoring becomes easy.

Embodiment 4 FIG.
FIG. 8 shows an example of a display screen of the electronic indicator in the fourth embodiment. The configuration of the electronic indicator is the same as that in FIG. 2 of the first embodiment. Below, it demonstrates centering on difference with Embodiment 1. FIG.

FIG. 8A shows a display screen for the operation mode, and FIG. 8B shows a display screen for the monitoring mode. When the measurement voltage value is the same as that in FIG. 4 of the first embodiment, the measurement value is displayed as in (a) in the operation mode. In the monitoring mode, since the measured value of each phase is within the normal voltage range, the set value is displayed as in (b) as in the first embodiment, but in this embodiment, in addition to this, In the normal voltage range, a measured value for the normal voltage range is added.
In general, an electronic indicating instrument is provided with a bar graph, and an example of using this is shown as an example. As the measurement value to be added to the bar graph, the maximum and minimum of the normal voltage range are shown as the normal voltage range set by the condition setting unit in the bar graph display range, and the measurement value is displayed with a triangle mark. . Also, the set value may be displayed.
In addition, as a measured value added to the bar graph, a measured value of the phase voltage of all the phases, a measured value of the phase voltage farthest from the normal voltage range, and an average value of each phase voltage may be displayed.

  As described above, according to the electronic indicator of the fourth embodiment, the display unit has a bar graph display function, the bar graph display range is set to the normal voltage range set by the condition setting unit, and the determination unit When it is determined that it is in the normal voltage range, the measured value is displayed on the bar graph display, so the margin rate for the normal voltage range can be confirmed, and detailed voltage monitoring such as helping to prevent abnormal occurrences is performed. It becomes easy.

Embodiment 5. FIG.
In the first embodiment, when the measurement value is determined to be normal in the monitoring mode, the fixed value set by the user is displayed. However, in the present embodiment, it is possible to display with the set voltage value corresponding to the measurement value. It is a thing.
FIG. 9 is a block diagram showing the configuration of the electronic indicator in the fifth embodiment. FIG. 10 is a flowchart showing the operation of displaying the measurement values in FIG. 9, and FIG. 11 is a flowchart showing further details of the processing unit in FIG.

In FIG. 9, the electronic indicator 30 is obtained by inputting the voltage of the circuit to be measured or the output of the transformer for the voltage obtained by stepping down the voltage of the circuit to be measured to the measurement calculation unit 31 to calculate the effective value and to calculate it. The measured value is sent to the display control unit 32. The display control unit 32 has an operation mode and a monitoring mode and can be switched. In the case of the operation mode, the measurement value obtained by the calculation by the measurement calculation unit 31 is displayed on the display unit 33. In the monitoring mode, the same system average voltage calculation process described later is performed.
Measurement calculation unit 31 to determination unit 35 are equivalent to measurement calculation unit 21 to determination unit 25 of the first embodiment in hardware. In the present embodiment, a communication address setting unit 36, a communication control unit 37, an identical system determination unit 38, an identical system data storage unit 39, and an identical system average voltage calculation unit 40 are further provided.

The condition setting unit 34 sets a normal voltage range in advance.
The set value of the condition setting unit 34 is determined by the same system average voltage calculation process as follows.
First, the communication control unit 37 collects the measured values of a plurality of electronic indicating instruments installed in the same system by communication in the order of the addresses set by the communication address setting unit 36. There are wired and wireless methods for connecting electronic indicating instruments.
Next, based on the normal voltage range that is the set condition, the same system determination unit 38 determines whether the collected measurement values are normal or abnormal. The measured value determined to be normal within the normal voltage range is stored as a calculation candidate in the same system data storage unit 39, then the average value of the stored data is calculated in the same system average voltage calculation unit 40, and this is set as a “set value”. And

  After the same system average voltage calculation process, the determination unit 35 in the display control unit 32 determines whether the measurement value obtained by the calculation by the measurement calculation unit 31 is normal or abnormal. As the determination condition, the normal voltage range of the condition setting unit 34 is used. If the measurement value obtained by the calculation by the measurement calculation unit 31 is within the normal voltage range, it is determined to be normal, and the above “set value” is displayed. 33. If it is outside the normal voltage range, it is determined as abnormal, and the “measurement value” obtained by the calculation by the measurement calculation unit 31 is displayed on the display unit 33.

Next, the above operation will be described in more detail with reference to the flowcharts of FIGS.
In S 71 of FIG. 10, the output of the instrument transformer is input to the measurement calculation unit 31, the measurement value is calculated by calculating the effective value of the input voltage in the measurement calculation unit 31, and is sent to the display control unit 32.
Next, in S72, it is determined whether the display mode of the display control unit 32 is in the monitoring mode, and the transition is made according to the stay mode.
If not in the monitoring mode, that is, in the operation mode, the process proceeds to S76, and the measurement value obtained by the measurement calculation unit 31 is displayed on the display unit 33.
In the case of the monitoring mode, the process proceeds to S73, and the same system average voltage calculation process for calculating the set value is performed.

FIG. 11 is a flowchart showing details of the calculation processing in S73. The same system average voltage calculation process will be described with reference to FIG.
When the arithmetic processing is started, first, in S81, the communication control unit 37 collects the measured values of the electronic indicating instruments installed in the same system in the order of the communication addresses set by the communication address setting unit 36.
Next, in S <b> 82, the same system determination unit 38 determines whether the collected measurement values are within the normal voltage range set by the condition setting unit 34.
If it determines with it being in a normal voltage range in S82, it will progress to S83, will be preserve | saved as a calculation candidate in the same system | strain data preservation | save part 39, and will move to S85.
If it is determined in S82 that the voltage is out of the normal voltage range, the process proceeds to S85 without making a calculation candidate.

In S85, S81 to S84 are repeated until collection of measurement values of all electronic indicating instruments installed in the same system is completed.
Next, in S86, after collecting the measured values of all the electronic indicator meters installed in the same system, the average value of calculation candidates stored in the same system data storage unit 39 is obtained by the same system average voltage calculation unit 40. This value is calculated and set as the set value of the condition setting unit 34, and the same system average voltage calculation process is terminated.

Returning to FIG. 10, in S <b> 74, the determination unit 35 determines whether or not the measurement value obtained by the measurement calculation unit 31 is within the normal voltage range set by the condition setting unit 34.
If it is determined in S74 that the measured value is within the normal voltage range, the set value set in the condition setting unit 34 in S86 of FIG.
If it is determined that the voltage is outside the normal voltage range in S74, the process proceeds to S76, and the measurement value obtained by the measurement calculation unit 31 is displayed on the display unit 33.

In the above description, the average value was calculated using the electronic indicator installed in the same system, and the set value was set, but even in the same system, the load may vary depending on the air conditioning, lighting, motor, etc. The user may determine whether the range is the same system by selecting an arbitrary electronic indicator.
Although the determination conditions of the determination unit 35 and the same system determination unit 38 are common, there may be variations in measurement values due to solid errors and the like, and different determination conditions may be set.

  As described above, according to the electronic indicator of the fifth embodiment, the communication control unit that collects the measurement values of the electronic indicator installed in the same system, and the measurement values collected by the communication controller are Same system determination unit that determines whether or not it is in the normal voltage range, and same system data storage unit that stores the collected measurement values as calculation candidates when the same system determination unit determines that it is in the normal voltage range, and the same system Because it has the same system average voltage calculation unit that calculates the average value of calculation candidates stored in the data storage unit, and the average value calculated by the same system average voltage calculation unit is set as the setting value of the condition setting unit By setting the value according to the measured values of multiple electronic indicators installed in the same system, even in places where generators are installed and voltage fluctuations are strong, the values are close to the actual measured values. Installed in the grid It is possible to match the display value of the electronic indicating instrument.

  In the present invention, it is possible to freely combine the respective embodiments within the scope of the invention, and to appropriately change or omit the respective embodiments.

1. Power receiving point, 2. Power receiving transformer, 3. Instrument transformer, 4. Electronic indicator instrument, 5. Instrument transformer, 6. Electronic indicator instrument, 7. Feeder transformer, 8. Instrument transformer, 9. Electronic indicator instrument, 10. Air conditioning , 11 Illumination, 12 Motor, 13-15 Electronic indicating instrument, 20 Electronic indicating instrument, 21 Measurement calculation unit, 22 Display control unit, 23 Display unit, 24 Condition setting unit, 25 Judgment unit, 26 Rated voltage setting unit, 30 electronic indicator, 31 measurement operation unit, 32 display control unit, 33 display unit, 34 condition setting unit, 35 determination unit, 36 communication address setting unit, 37 communication control unit, 38 same system determination unit, 39 same system data Storage unit, 40
Same system average voltage calculator.

Claims (6)

An electronic indicating instrument used for voltage monitoring in a power system,
A measurement operation unit that takes in the voltage of the circuit to be measured directly or through an instrument transformer and calculates an effective voltage value;
A display for displaying the measurement results;
A condition setting section for setting a normal voltage range and a set value that is a standard for normality;
A determination unit for determining whether or not a measurement value obtained by calculation in the measurement calculation unit is within the normal voltage range;
A display control unit that controls display content on the display unit,
The display control unit displays the set value when the determination unit determines that the measurement value is in the normal voltage range, and displays the measurement value when the determination unit determines that the measurement value is not within the normal voltage range. An electronic indicating instrument characterized by being displayed. The electronic indicating instrument according to claim 1,
Furthermore, it has a rated voltage setting unit for setting a rated voltage according to the voltage of the circuit to be measured,
Use the rated voltage value set by the rated voltage setting unit as the setting value of the condition setting unit,
An electronic indicator that displays the rated voltage value when the determination unit determines that the measured value is within the normal voltage range. The electronic indicating instrument according to claim 2,
The normal voltage range set by the condition setting unit is automatically set based on the measurement accuracy of the electronic indicator and the rated voltage value set by the rated voltage setting unit. Electronic indicator instrument. The electronic indicating instrument according to claim 1,
An electronic indicating instrument characterized by alternately displaying the measured value and a specific display indicating an abnormality when the determination unit determines that the voltage is not within the normal voltage range. The electronic indicating instrument according to claim 1,
The display unit has a function of displaying a bar graph, the range of the bar graph display is the normal voltage range set by the condition setting unit, and when the determination unit determines that it is in the normal voltage range, An electronic indicating instrument characterized in that the measured value is displayed in a bar graph display. The electronic indicating instrument according to claim 1,
Furthermore, a communication control unit that collects the measurement value of the electronic indicator installed in the same system, and a same system determination unit that determines whether the measurement value collected by the communication control unit is within the normal voltage range When,
When it is determined by the same system determination unit that the voltage is within the normal voltage range, the same system data storage unit that stores the collected measurement values as calculation candidates;
The same system average voltage calculation unit that calculates the average value of the calculation candidates stored in the same system data storage unit,
An electronic indicating instrument characterized in that an average value calculated by the same system average voltage calculation unit is used as the set value of the condition setting unit.