JP3325738B2 - Composite indicating instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic compound instruction which can be attached to a power receiving panel, a power distribution panel, or the like to switch and display various electric quantities such as current, voltage, power factor, and frequency. It is about an instrument.

[0002]

2. Description of the Related Art Conventionally, there is a composite indicating instrument shown in FIG. 19 which is attached to a switchboard to measure and display various electric quantities. As for this instrument, AC current (R phase, S
Phase, T phase), AC voltage (RS phase, ST phase, TR)
Phase) and electric power are displayed on the numerical indicators 1a and 1b. However, AC current and AC voltage are indicated by the numeric display 1a.
Must be switched and displayed because
LED when number display 1a is displaying AC current
LED 2a lights when the AC voltage is displayed.
b is turned on. Which one of the phases is being displayed is determined by turning on one of the LEDs 3a, 3b, and 3c. Since this instrument shares the numeric display 1a for displaying the values between the AC current phases and the AC voltage phases, it is necessary to switch the display. Reference numeral 4 denotes a display switch for this purpose, and the display contents are sequentially switched each time the switch is pressed.

[0003]

Since the conventional meter is configured as described above, there is a problem that it cannot meet the following requirements .

[0004] a) Even if it is installed at a high place on the board, the display is turned off.
A simple configuration that allows easy operation of the changeover switch has been obtained.
No. B) When an alarm occurs, immediately check the amount of electricity that generated the alarm.
I want to. C) Multiple electric quantities can be set by operating the display changeover switch.
Are displayed in a predetermined order,
I want to switch automatically every time and display in a cyclic manner. D) Doors are closed when attached to outdoor cubicles, etc.
I want to switch the display even when the display is E) I want to know the class corresponding to the quantity of electricity.

[0005] The present invention has been made to address the above problems.
Satisfies the above requirements and reduces wiring.
Can be realized and easy to use
It is intended to provide a composite instrument.

[0006]

SUMMARY OF THE INVENTION A composite indicating instrument according to the present invention is attached to a power receiving panel or a distribution panel, measures a plurality of electric quantities, selects one of the electric quantities, and selects the selected electric quantity. The selected indicator is selected on the composite indicating instrument that displays the type of electrical quantity, the measured value, the unit, and the phase to be measured.
The type of unit, unit, and phase to be measured are indicated by symbols,
A display unit that displays measured values digitally or as a bar graph ,
Display off to switch the type of electricity displayed on this display
Operation of the changeover switch and this display changeover switch
And sequentially switches the type of electricity quantity in a predetermined order
A display switching drive unit having a photocoupler for generating a switching drive signal, and capable of measuring a plurality of electric quantities ,
Arithmetic processing unit providing a single electrical quantity which is selectively switched in response to the switching drive signal to the display unit, and includes an operation power supply power to the processing unit the display unit, the power supply the operating power supply, This is shared with a drive power supply for the display switching drive means.

Further, in the above configuration, the display changeover switch is a remote switch connected to the composite indicating instrument main body by a lead wire.

[0008] Further, the type and unit of the selected electric quantity,
Symbolizes the phase to be measured and digitally displays the measured value
Or display unit for displaying the bar graph, a display changeover switch for switching the type of the electric quantity to be displayed on the display unit,
It operates when this display changeover switch is operated, and
A switching drive signal that sequentially switches types in a predetermined order
Display switching drive means having a photocoupler that results
A plurality of electric quantities can be measured, and the switching drive signal can be measured.
The display unit of one quantity of electricity selectively switched in accordance with No.
Processing unit that gives the, and with operating power supply power to the processing unit the display unit, the arithmetic processing unit, the table
When the operation of the display changeover switch of the indicating changeover driving means is continued for a predetermined time or more, the display of the electric quantity on the display unit is automatically switched every predetermined time so that the plurality of electric quantities are cyclically displayed in a predetermined order. It was done.

Further, when the display changeover switch is operated during the cyclic display, the arithmetic processing section stops the cyclic display at that time and fixes the display at that time.

When the display changeover switch is operated during the cyclic display, the arithmetic processing unit stops the cyclic display at that time and displays a predetermined amount of electricity .

Further, the type and unit of the selected electric quantity,
Symbolizes the phase to be measured and digitally displays the measured value
Or display unit for displaying the bar graph, a display changeover switch for switching the type of the electric quantity to be displayed on the display unit,
It operates when this display changeover switch is operated, and
A switching drive signal that sequentially switches types in a predetermined order
Display switching drive means having a photocoupler that results
A plurality of electric quantities can be measured, and the switching drive signal can be measured.
The display unit of one quantity of electricity selectively switched in accordance with No.
Processing unit that gives the alarm setting means to set the alarm value for a given quantity of electricity, comparison means for comparing the the measured value and alarm setpoint, and operating power supply for electrodeposition to an arithmetic processing unit said display unit A power source is provided, and when a warning is output from the comparing means, the display on the display unit is switched to the amount of electricity for which a warning is issued .

[0012] In addition, the processing unit is out of the alarm electrical
A flashing display unit for flashing the display of the amount is provided.

Also, the arithmetic processing unit operates the changeover switch to display other electric power while the alarm-generated electric quantity is blinking.
Switching to the amount can be displayed, and a message indicating that an alarm is occurring is made to blink.

Further, the arithmetic processing unit can switch the display to another electric quantity by operating the changeover switch even while the display of the alarm electric quantity is blinking, and display the alarm electric quantity as the display indicating that the alarm is being generated . Is blinked.

The arithmetic processing section blinks a display element indicating the amount of electricity being displayed.

The display section is switched and displayed.
Class display means for indicating the class of the electric quantity is provided.

The display changeover switch is provided by a magnet.
Opening and closing operations are performed.

[0018]

According to the present invention, there is provided a composite indicating instrument for switching display.
The power supply of the driving means is also used as the power supply for operation of each part of the indicator.
Display with one input terminal and one wiring
The replacement drive means can be activated,
The displayed electric quantities can be sequentially switched and displayed.

Further , the display changeover switch is set for a predetermined time or less.
The display can be cycled by holding the button up
Not only the operation of the display change switch during cyclic display
To stop the circulation and reset to the specified display
I have.

Further , the alarm setting means can be used when an alarm is generated.
Indicates an alarm immediately without operating the display changeover switch
The alarm is indicated by the blinking of the display, the blinking of the display element, etc.
Can be made.

[0021]

[Embodiment 1 ] An embodiment of the present invention will be described below with reference to the drawings. Figure 1
1 is an external view of a composite indicating instrument according to Embodiment 1 of the present invention,
The display unit 200 is composed of a liquid crystal. In the figure, 2
Is a numeric display, and the measured value of the measurement item is
indicate. 5 is a bar graph display, the measured value of the measurement item
Is displayed as a bar graph. 6a to 6f are currently displayed
For example, FIG. 1 shows electric power (W).
In this case, the mark 7 in a square frame is turned on.
And can be identified by

Reference numeral 10 denotes a unit display, which displays the unit of the currently displayed measurement item using a dot matrix.
Symbols 11a to 11c indicate that the circuit is a three-phase unbalanced circuit. In the case of measuring power and power factor, all of 11a to 11c are turned on, and in the case of measuring AC current and AC voltage, only 11a is turned on. Reference numeral 12 denotes a display indicating the class of the instrument.
"CLASS1.5" for AC voltage, "CLASS5.0" for power factor, "CLA" for frequency
SS1.0 ". FIG. 6 shows the arrangement of the display elements of the class display and the display of the class corresponding to each display item.

FIGS. 2 to 5 show display states of the respective measurement items described above. 2 is an AC current display screen, FIG. 3 is an AC voltage display screen, FIG. 4 is a power factor display screen, and FIG. 5 is a frequency display screen. Although the display screen of the reactive power is not shown, it can be similarly configured. Here, FIG.
5 can be switched by pressing the display changeover switch 4 attached to the instrument. In this embodiment, a remote display changeover switch 20 which can be attached to and detached from the instrument body is provided. The switch 20 is mounted at a low position where it can be easily operated, and the display is sequentially switched by pressing this switch.

Next, the circuit of the display changeover switch 20 will be described. FIG. 20 is a circuit diagram showing the connection of a conventional display changeover switch. In this circuit, a power supply 22a for display switching drive means and a power supply 22b for operating power supply of an instrument are separately provided, and connection terminals 21a, 2
1b and 23a, 23b, the circuit was complicated. On the other hand, the circuit of this embodiment has a configuration as shown in FIG. In FIG. 7, reference numeral 22 denotes an AC power supply;
a and 23b are power terminals of the meter of the present invention. The power source of this instrument is a rectifying diode 24a to 24d, in which the AC waveform is full-wave rectified, smoothed by a capacitor 25, and a DC voltage stabilized by a DC stabilizing circuit 26 is generated. Is configured to be supplied with power. Note that, if the DC stabilizing circuit 26 is configured by a switching power supply circuit, normal operation can be performed even if a DC voltage power supply is connected to the power supply terminals 23a and 23b instead of the AC power supply 22.

One end of the display changeover switch 20 is connected to a display changeover input terminal 21, and the other end is connected to one pole of an AC power supply 22, that is, a power supply terminal 23 a. 27 is a resistor, 28 is a photocoupler comprising a diode 28a and a transistor 28b, 100 is a display unit 20
An arithmetic processing unit that generates a signal for switching the display of 0.

In this configuration, when the display changeover switch 20 is pressed to close the circuit, the AC power supply 22 → display changeover switch 20 → display changeover input terminal 21 → resistor 27 → diode 28a of the photocoupler 28 → diode 24d → power supply terminal 23b → The circuit connected to the AC power supply 22 is closed, the transistor 28b is turned on by the current flowing through the diode 28a of the photocoupler 28, and this signal is input to the arithmetic processing unit 100 as a display switching drive signal. The arithmetic processing unit 100 recognizes this, and switches the measurement value of the display item to the display unit 200 for display. Each time the display changeover switch 20 is pressed, the measured values of the display items are sequentially circulated and displayed as shown in FIGS. 8 is exactly the same as FIG. 7 except that the display changeover switch 20 is connected to the other end of the AC power supply 22, and performs the same operation. Further, FIG. 9 is the one in which the AC power supply 22 of FIG. 7 is replaced by the DC power supply 30, and performs the same operation as FIG.

Embodiment 2 FIG. The present embodiment shown in FIGS. 10 to 13 is different from the first embodiment in the circuit configuration of the display changeover switch, and includes two photocouplers 28 and 29. The transistors 28b and 29b of the photocouplers 28 and 29 are connected in parallel to the arithmetic processing unit 100, while the diodes 28a and 29a have opposite polarities and are connected to different terminals on the full-wave rectification output side of the diodes 24a to 24d. ing.

In FIG. 10, the display changeover switch 2
When 0 is pressed and closed, the AC power supply 22 → the display changeover switch 20 → the display changeover input terminal 21 → the resistor 27 → the diode 28 a of the photocoupler 28 → the diode 24 d →
Circuit connected to power supply terminal 23b → AC power supply 22 and circuit connected to AC power supply 22 → power supply terminal 23b → diode 24b → diode 29a of photocoupler 29 → resistor 27 → display switching input terminal 21 → display switching switch 20 → AC power supply 22 , Ie, a circuit driven by an AC full wave. FIG. 11 is exactly the same as FIG. 10 except that the display changeover switch 20 is connected to the other end of the AC power supply 22, and performs the same operation. FIG.
Is obtained by replacing the AC power supply 22 of FIG. 10 with a DC power supply 30, and performs the same operation as that of FIG. Furthermore, FIG.
As shown in FIG. 7, in this embodiment, 29 is provided in addition to the photocoupler 28, so that the same operation is performed even if one end of the display changeover switch 20 is connected to the negative electrode of the DC power supply 30. With one input terminal and one wiring, it is possible to realize a display changeover switch circuit that operates with either an AC power supply or a DC power supply regardless of the polarity of the power supply.

Embodiment 3 FIG. Next, an embodiment will be described in which the instrument of the present invention is attached to an outdoor cubicle or the like, and the display can be switched and viewed even when the door is closed. FIG. 14 is a side sectional view of this embodiment.
Numeral 0 is a composite indicating instrument main body of the present invention capable of displaying the information shown in FIGS. Switch. Reference numeral 43 denotes an iron door of an outdoor cubicle, and reference numeral 44 denotes a glass window attached to the door 43 with a rubber packing 45, through which the display of the composite indicator 40 can be seen. Reference numeral 46 denotes a magnet that allows the operator to approach the magnetic detection switch 41 through the window 44. The magnetism detection switch 41 detects the magnetic field of the magnet 46 and closes the built-in contact, which has been described in the second and third embodiments. The display switch circuit is closed, and the display of the composite indicating instrument 40 is switched.

FIG. 15 shows an internal circuit of the magnetic detection switch 41. Reference numeral 41a denotes a magnetoresistive element,
Is detected, and its resistance value changes. Due to this change in the resistance value, the input voltage 50a of the comparator 50 changes. On the other hand, resistors 51a, 51b, 51c
The reference voltage 50b of the reference voltage generation circuit composed of the above and the input voltage 50a are compared by the comparator 50, and when the input voltage 50a falls below the reference voltage 50b, the output of the comparator 50 is inverted to drive the transistor 52, The relay coil 53a is excited, and its output contact 53b is closed. Therefore, if the signal of the output contact 53b is used as a substitute for the display changeover switch 20 described in the second and third embodiments, a display changeover circuit can be configured.
In this embodiment, an example in which a magnetoresistive element is used has been described. However, a similar operation can be performed by using a reed switch.

Embodiment 4 FIG. FIG. 16 is a block circuit diagram showing Embodiment 4 of the present invention.
Reference numerals 2 and 103 denote R phase and S phase of an electric circuit to be measured, respectively.
Phase, T phase. Here, for convenience of explanation, three-phase 3
The line circuit will be described, but it is needless to say that a single-phase three-wire circuit and a three-phase four-wire circuit can be realized with almost the same configuration. 104 is an instrument transformer (hereinafter referred to as VT) for stepping down the voltage between the R and S phases, and 105 is a VT for stepping down the voltage between the S and T phases. 106 and 107 are R phase,
Instrument current transformer that transforms T-phase current (hereinafter referred to as CT)
It is. 108 is the VT 104, 105 and CT 10
The signal converter 6 converts the signals 6 and 107 into a DC voltage signal proportional to the signal, for example, 0 to 5 V DC. 109
Is a multiplexer that selects an output signal of the signal conversion unit 108 according to a control signal of the measurement control unit 110. 11
An A / D converter 1 converts an output signal of the signal converter 108 selected by the multiplexer 109 into a digital signal. The values converted to digital signals are stored in the storage units 112a to 112k for the respective measurement values for each measurement item. The maximum value of the current of each of the R, S, and T phases is stored in the maximum value storage units 113a to 113c.

Reference numerals 20 to 28 are the same as those described with reference to FIG. 7. The same reference numerals denote the same parts, and a description thereof is omitted. The output of the photocoupler 28 is a display changeover switch provided in the instrument. 4 is connected to the OR circuit 31 and input to the determination unit 114 for 3 seconds. Judgment unit 1 for 3 seconds
Reference numeral 14 designates that the display changeover switches 20 and 4 are pressed for 3 seconds or more. If the display changeover switches 20 and 4 are shorter than 3 seconds, the signal 115 is input to the display changeover unit 119 via the AND circuit 122 and the OR circuit 118. The display item is switched by one item. Incidentally, the display switching unit 119 includes the storage units 112a to 112k for the measured values and the maximum value storage unit 1
13a to 113c and the upper limit alarm setting value 121 set by the upper limit alarm setting unit 120 are sequentially selected and displayed on the display unit 200.

When the display changeover switches 20 and 4 are pressed for more than three seconds, the three-second determination unit 114 outputs a three-second excess signal. In response to this signal, the cyclic display control unit 117 outputs a display switching signal every fixed time, for example, every 5 seconds, and this signal is input to the display switching unit 119 via the OR circuit 118. Are displayed sequentially in a circular manner as shown in FIG. In addition,
When the display changeover switch 20 or 4 is pressed in the middle of the circulation display, the circulation control unit 117 stops the operation by the signal 115. Therefore, the cyclic display is stopped, and the screen at that time is kept displayed.

Reference numerals 123a to 123c denote comparison units which are the upper limit alarm set value 121 and the measured value storage units 112a to 112c.
Each value of c is compared. Then, the measured value storage unit 112
When the values of a to 112c are equal to or greater than the upper limit alarm set value 121, alarm signals 127a to 127c are output. 124a
To 124c are relay drive circuits driven by the above-mentioned alarm signal.
The drive is performed according to the numbers of c. Relay contacts 125a-
The signal 125c is output as an alarm signal to the terminals 126, 126a to 126c. In the case of this example, the terminal 12
6 are common but 126
It is also possible to configure a, 126b and 126c as independent contact outputs.

The alarm signals 127a to 127c output from the comparison units 123a to 123c are input to the blinking display unit 128, and the blinking display unit 128 blinks the display on the display unit 200 to call attention of the observer. Here, when the observer operates the display changeover switch 20 or 4 to switch the display to another item, the blinking display unit 128 blinks only the “upper limit” message 201 and stops blinking the entire display screen. . Thus, it can be determined that the alarm is being generated regardless of the screen being switched.

When the display switching unit 119 selects and displays the values of the measured value storage units 112a to 112k, the class of the display item is displayed on the display elements 202 to 202 of the display unit 200.
207 is displayed by a signal from the class display unit 129. That is, R-phase to T-phase alternating current, R-S phase to S
-When the AC voltage, power, and reactive power between the T phases are displayed, the display terminals 202 to
204 is turned on. When the power factor is displayed, the display terminals 204, 206, and 207 are lit because the class is class 5.0. When the frequency is displayed, the display element 205, 206, 207 is turned on because the class is class 1.0.
As described above, the class display is switched when the display is switched in conjunction with the display item, so that the class of the display item can be known at a glance.

If the display changeover switch 20 or 4 is operated to switch to another item during the generation of the alarm, it is not clear which item has generated the alarm. This solution is described below. Reference numeral 130 denotes a display item display unit, which indicates whether the display item selected by the display switching unit 119 is, for example, an AC current, an AC voltage, or an electric power.
The S-phase or the T-phase is identified, and the display element corresponding to that is blinked. For example, the display element 210 for AC current, the display element 211 for AC voltage, the display element 212 for power, and the display element 213 for power factor.
, The display element 214 for the reactive power, and the display element 215 for the frequency. In the case of an alternating current, the display element 216 for the R phase, the display element 217 for the S phase, and the display element S218 for the T phase are blinked to indicate the phase. In the case of the AC voltage, the display elements 216 and 217 are displayed in the case of the RS phase, and the display element 21 is displayed in the case of the ST phase.
7, 218 are the display elements 218, 21 in the case of the TR phase.
6 are blinked respectively. The display item display unit 130 displays each of the display elements 210 to 218 during normal display switching.
Works as described above. During the alarm generation, the display element of the alarm generation item blinks even if the display is switched to another item.

Reference numeral 131 denotes a unit display section. This controls the lighting of the unit display element 219 so as to display the unit of the display item selected by the display switching unit 119. The unit display element 219 is formed of a dot matrix, and A, KA, V, K as shown in FIGS.
A, W, KW, MW, Hz, Cosφ, Var, KVa
The unit is displayed with r and MVar. As described above, the unit of the measurement display unit can be easily read.

In the above configuration, the display selection switch 20
Alternatively, if 4 is pressed for a certain period of time, for example, 3 seconds, FIG.
The display contents are displayed in a circular manner such that the display items are displayed in the order shown in FIG. Therefore, if the monitor is left in this state, the monitor can read each item at intervals of 5 seconds without operating the display changeover switch 20 or 4 each time. In FIG. 17, IR, IS, and IT are R phase and S phase, respectively.
3 shows the current of the phase and the T phase. Reference numerals 61 to 66 denote instantaneous values and maximum values of R-phase, S-phase, and T-phase currents. Reference numerals 67 to 69 denote RS phase, ST phase, and TR phase voltages, respectively. 70 is the instantaneous value of power (W), 71 is the instantaneous value of power factor (Cos
), 72 are instantaneous values of reactive power (Var), 73 are instantaneous values of frequency (Hz), and 74 are upper limit alarm set values (I) for each of the R, S, and T phases.

When the display changeover switch 20 or 4 is pressed while the display is being circulated, the display can be stopped from being circulated. In this case, the display is stopped at the screen of the item displayed when the display selection switch is pressed. Thereafter, the desired screen can be selected by pressing the display changeover switch 20 or 4 a required number of times. Alternatively, when the circulation of the display is stopped, it can be configured to return to the predetermined initial screen, and the operation can be omitted.

Next, the operation when an alarm is generated will be described. As shown in FIG. 18, when an alarm occurs, the current display screen 80 is automatically switched to a display screen 81 of an alarm occurrence item. When the alarm is restored, the screen changes from 81 to 80
Return to Therefore, the screen of the item for which the alarm has occurred can be read by the observer without any operation of the display changeover switch 20 or 4. In addition, by flashing the screen during the generation of the alarm, the watcher's attention can be raised, and the monitor can easily recognize that the alarm is being generated. When the display changeover switch 20 or 4 is pressed while the display screen 81 of the alarm occurrence item is displayed (82), the display is switched to the screen of the next item (83) and the display is performed. Thereafter, every time the display changeover switch 20 or 4 is pressed, the screen switches from 84 to 85 to 86 to 87, and makes a round from 83 to 84.

While the cyclic display is performed when the display changeover switch 20 or 4 is pressed for 3 seconds, for example, as described above, if the screen flashes also when the screen is switched to the screen of the item for which no alarm is generated, There is a risk that the observer may make an erroneous decision as if an alarm has occurred for this item. Therefore, when the screen is switched to an item that does not generate an alarm, the blinking of the entire screen is stopped, and only a message indicating that an alarm is being generated, for example, a display such as “upper limit” is made to blink.

If the display is switched to a screen where no alarm is generated during the generation of the alarm, there is a concern that it is not possible to know whether the alarm is being generated or which item is generating the alarm. For this, a display element indicating which item is generating an alarm in the display unit, for example, A, V, W, Co
A display element such as sφ, Var, Hz, etc. is provided, and even if the screen is switched to another screen while an alarm is being generated, the display element blinks to make it easier for the observer to understand.

[0044]

As described above, according to the present invention, the circuit of the display changeover switch can be simplified and the wiring can be reduced. This is particularly effective when the number of wires is small, especially when the display changeover switch is pulled out of the main body of the instrument and made remote.

By operating the display changeover switch, not only the display can be sequentially changed, but also the circulation can be changed so that the display is automatically changed, so that the operation can be more easily performed. In addition, during the cyclic display, the display can be skipped to the specific display as needed.

In addition, when an alarm is generated, the display automatically switches to a display in which an alarm is generated, and the fact that an alarm is being generated is displayed by blinking or the like, so that it is possible to immediately respond to the generation of an alarm.

By displaying the class of the electric quantity selected by the display changeover switch and the unit of the measured value,
The display can be more easily viewed.

In addition, since the operation of the display changeover switch can be controlled by the magnet, there is an effect that the display changeover can be performed without opening the panel at the time of operation, even if the display changeover switch is installed in a closed board. .

[Brief description of the drawings]

FIG. 1 is a front view showing the appearance of a composite indicating instrument according to the present invention.

FIG. 2 is a display screen showing a measurement state of an alternating current of the composite indicating instrument according to the present invention.

FIG. 3 is a display screen showing a measurement state of an AC voltage of the composite indicating instrument according to the present invention.

FIG. 4 is a display screen showing a power factor measurement state of the composite indicating instrument according to the present invention.

FIG. 5 is a display screen showing a frequency measurement state of the composite indicating instrument according to the present invention.

FIG. 6 is a layout view of a class display element of the composite indicating instrument according to the present invention.

FIG. 7 is a diagram illustrating a display changeover switch circuit according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a display changeover switch circuit according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating a display changeover switch circuit according to the first embodiment of the present invention.

FIG. 10 is a diagram showing a display changeover switch circuit according to Embodiment 2 of the present invention.

FIG. 11 is a diagram showing a display changeover switch circuit according to Embodiment 2 of the present invention.

FIG. 12 is a diagram showing a display changeover switch circuit according to Embodiment 2 of the present invention.

FIG. 13 is a diagram showing a display changeover switch circuit according to Embodiment 2 of the present invention.

FIG. 14 is a side view of a composite indicating instrument according to Embodiment 3 of the present invention.

FIG. 15 is a diagram showing a display changeover switch operation circuit according to Embodiment 3 of the present invention.

FIG. 16 is a diagram showing a circuit of a composite indicating instrument according to Embodiment 4 of the present invention.

FIG. 17 is a diagram illustrating a display switching state for explaining the operation of the fourth embodiment.

FIG. 18 is a diagram illustrating a display switching state for explaining the operation of the fourth embodiment.

FIG. 19 is a front view showing the appearance of a conventional composite indicating instrument.

FIG. 20 is a diagram showing a conventional display changeover switch circuit.

[Explanation of symbols]

2 Number display, 4 Display switch, 5
Bar graph display, 6a to 6f Measurement item, 7 mark, 10 unit display, 12 class display, 20 display changeover switch, 21 input terminal, 22 AC power supply,
23a, 23b power supply terminal, 24a to 24d diode, 26 DC stabilization circuit, 28, 29 photocoupler, 30 DC power supply, 40 composite indicator main body, 41
Magnetic detection switch, 41a magnetoresistive element, 43 cubicle door, 44 glass window, 46 magnet, 50 comparator, 53a relay coil, 53b output contact,
100 arithmetic processing unit, 101, 102, 103 three-phase electric circuit, 104, 105 instrument transformer, 106, 10
7 Current transformer for instrument, 108 Signal converter, 109 multiplexer, 110 Measurement controller, 111 A / D converter, 112a to 112k Storage unit, 113a to 113c
Maximum value storage unit, 114 3-second determination unit, 117 circulation display control unit, 119 display switching unit, 120 upper limit alarm setting unit, 123a to 123c comparison unit, 124a to 1
24c relay drive circuit, 125a to 125c relay contacts, 128 blinking display section, 129 rank display section, 13
0 display item display section, 131 unit display section, 200 display section, 201 message, 202 to 207 display element, 210 to 219 display element.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-242155 (JP, A) JP-A-7-270459 (JP, A) JP-A-2-74872 (JP, A) Jpn. 99369 (JP, U) JP-A 3-19968 (JP, U) JP-A 62-180772 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 21/00-22 / 00 130 G01D 7/00 G01R 13/00 G01R 19/00-19/32 G01R 11/00-11/66 H02B 15/00

Claims (12)

(57) [Claims] 1. A method for measuring a plurality of electric quantities attached to a power receiving panel or a distribution panel, selecting one of the electric quantities, and selecting a type of the selected electric quantity, a measured value, a unit,
In the composite indicating instrument for displaying the target object phase is selected
When the type of electricity quantity, unit and phase to be measured are indicated by symbols
In both cases , a display unit that displays a measured value digitally or in a bar graph , and a type of electric quantity displayed on the display unit are switched.
The display changeover switch and the display changeover switch
A photocoupler that operates during operation to generate a switching drive signal for sequentially switching the type of electric quantity in a predetermined order.
Display switching driving unit that, when a plurality of electrical quantities may measure
Both includes arithmetic processing unit for a single quantity of electricity selectively switched supplied to the display unit, and the operating power supply power to the processing unit on <br/> Symbol display unit in response to the switching drive signal,
A composite indicating instrument characterized in that the operating power supply power supply is shared as a drive power supply for the display switching drive means. 2. The composite indicating instrument according to claim 1, wherein the display changeover switch is a remote switch connected to the composite indicating instrument main body by a lead wire. 3. A method for measuring a plurality of electric quantities attached to a power receiving panel or a distribution board, selecting one of the electric quantities, and selecting a type of the selected electric quantity, a measured value, a unit,
In the composite indicating instrument for displaying the target object phase is selected
When the type of electricity quantity, unit and phase to be measured are indicated by symbols
In both cases , a display unit that displays a measured value digitally or in a bar graph , and a type of electric quantity displayed on the display unit are switched.
The display changeover switch and the display changeover switch
A photocoupler that operates during operation to generate a switching drive signal for sequentially switching the type of electric quantity in a predetermined order.
Display switching driving unit that, when a plurality of electrical quantities may measure
Both includes arithmetic processing unit for a single quantity of electricity selectively switched supplied to the display unit, and the operating power supply power to the processing unit on <br/> Symbol display unit in response to the switching drive signal,
When the operation of the display changeover switch of the display changeover driving means continues for a predetermined time or more, the arithmetic processing unit automatically switches the display of the electric amount on the display unit every predetermined time to change the plurality of electric amounts to a predetermined amount. A composite indicating instrument characterized by being displayed in a cyclic manner in order. Wherein the arithmetic processing unit, when the operation of the display changeover switch in the circulation display is carried out, circulation display at that time is stopped, characterized in that it is adapted to fix the display of the time The composite indicating instrument according to claim 3 . 5. The arithmetic processing unit, when the operation of the display changeover switch in the circulation display is carried out, circulation display at that time is stopped, Re name of <br/> to display the quantity of electricity predetermined The composite indicating instrument according to claim 3, wherein: 6. A method of measuring a plurality of electric quantities attached to a power receiving panel or a distribution board, selecting one of the electric quantities, and selecting a type of the selected electric quantity, a measured value, a unit,
In the composite indicating instrument for displaying the target object phase is selected
When the type of electricity quantity, unit and phase to be measured are indicated by symbols
In both cases , a display unit that displays a measured value digitally or in a bar graph , and a type of electric quantity displayed on the display unit are switched.
The display changeover switch and the display changeover switch
A photocoupler that operates during operation to generate a switching drive signal for sequentially switching the type of electric quantity in a predetermined order.
Display switching driving unit that, when a plurality of electrical quantities may measure
Both, the processing unit providing a single electrical quantity which is selectively switched in response to the switching drive signal to the display unit, the alarm setting means to set the alarm value for a given quantity of electricity, and the measured value and alarm setpoint comparison means to compare, and provided with operating power supply for power to the processing unit the display unit, when there is alarm output from said comparing means, display of the display unit is switched to the electric quantity reporting the alarm A composite indicating instrument characterized in that it is adapted to be operated. 7. The composite indicating instrument according to claim 6 , wherein the arithmetic processing unit includes a blinking display unit for blinking the display of the quantity of electricity for which an alarm is issued. 8. A processing unit may be blinking display the alarm electrical quantity, can be switched display to other electric quantity by the operation of the changeover switch, configured so as to blink the message indicating that the alarm Claims characterized in that
A composite indicating instrument according to claim 6 or claim 7 . 9. The arithmetic processing unit can display a switch to another electric quantity by operating a changeover switch even while the alarm generated electric quantity is blinking, and indicates the alarm generated electric quantity as a display indicating that the alarm is being generated. complex indicating instrument according to claim 6 or claim 7, wherein that have been made so as to blink the display device. 10. The arithmetic processing unit, a composite indicating instrument according to one of claims 1 to 8, characterized in that the CPU 120 is configured to blink the display device illustrating the electrical quantity being displayed. 11. A display unit, complex indicating instrument according to one of claims 1 to 10, characterized in that it comprises a rank display means for indicating a rank of the amount of electricity being switched displayed. 12. The display changeover switch, combined indicating instrument of any one of claims 1及 beauty claims 3 to 11, characterized in that opening and closing operation is made to take place by the magnet.