JPH0226226A - Demand power monitoring apparatus - Google Patents

Abstract

PURPOSE:To reduce in size a whole demand power monitoring apparatus by lighting indicator groups in each block. CONSTITUTION:In an indicator group 33L for demand power, the indicators 33L1-33L5 are as a first block, the indicators 33L6-33L10 are as a second block,..., the indicators 33Ln-4-33Ln are as n-th block, and the indicators 33Ln+1-33Ln+1 are as (n+1)-th block. Then, when the indicators 33L1-33L5 of the first block are all lit and the indicators 33L6-33L10 of the second block start lighting, the indicators 33L1-33L5 of the first block are all lit-out. Similarly, when the indicators 3Ln-4-33Ln of the n-th block are sequentially all lit and the indicators 33Ln+1-33Ln+5 of (n+1)-th block start lighting, the indicators Ln-4-33Ln of the n-th block are all lit-out. In time limit indicator group 43L, the indicators are similarly lit in each block. Thus, power consumption and heat generation can be suppressed to reduce in size the whole apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power demand monitoring device, and particularly to a display thereof.

[Prior art] Fig. 3 is a perspective view showing a conventional power demand monitoring device disclosed in, for example, Japanese Utility Model Application Publication No. 55-355'l1.
The figure is a professional diagram showing the display device of the same device. Third
In the figure, n electric indicators (33L1
．． 33L2, 33L3. ...33Ln) (hereinafter referred to as display devices) are arranged in a strip shape in a continuous manner adjacent to each other.
3L) is for demand power, and is lit up in a bar graph shape in response to the demand power consumed by the load, and the scale value (34)
It is now possible to read the power demand value at that time. In addition, in parallel with this display group (33L), other n displays (43L1, 43L2, 43L)
A display group (43L) is provided in which display units (L3--, -43Ln) are arranged in a strip shape in a continuous manner adjacent to each other. This display group (43L) is for a time limit, and is lit up sequentially in a bar graph shape according to the elapsed time of the demand time limit, and the scale value (43L) is
4) allows you to read the elapsed time at that point.

The operation of these display groups (33L, 43L) will be explained in more detail.

The power demand monitoring device receives a pulse signal transmitted from a wattmeter (not shown) corresponding to the amount of power consumed by the load. This pulse signal is integrated within the device, and when a predetermined unit power amount is reached, the leftmost display (33Ll) of the power demand display group (33L) lights up, and a display is displayed when the next unit power amount is consumed. (33L2). In this way, each time a unit of power is consumed, a group of indicators (33L
) are lit from the left end, so the lit indicators take the form of a bar graph as a whole, and the length of the lit indicators is 1, which indicates the consumed power up to that point. On the other hand, when the unit time has elapsed, the time limit display group (43L)
The leftmost indicator (43L+) is turned on, and when the next unit time has elapsed, the indicator (43L2) is turned on. In this way, each unit of time passes, the display group (4
3L) is lit from the left end, so the lit indicators take on the shape of a bar graph as a whole, and the length of the lit indicators indicates the time that has passed up to that point. Note that when the specified time limit for demand power, for example 30 minutes, has elapsed, the lit demand power display group (33L) and time limit display group (43L) turn off, and the leftmost display returns. (33Ll
, 43Ll), the lights are turned on sequentially in accordance with the power consumption of the load and the passage of time.

Also, the lengths of both display groups (33L, 43L) are:
A predetermined value in the display group (33L), for example, the length to the display (33Ln) corresponding to the contract power value, and a predetermined value in the display group (43L), for example, the length to the display (43Ln) corresponding to the demand time limit value. Configure it so that the lengths match.

In the conventional power demand monitoring device configured in this way, the time-limited display group (43L) lights up at a constant pace, so the length of the bar graph of the lit display group (43L) indicates the power consumption at that point. This corresponds to the target power demand that should be achieved. On the other hand, the display group for demand power (33L
) The length of the bar graph of the illuminated indicator corresponds to the demand power actually consumed by the load up to that point. Therefore, by comparing the lengths of both bar graphs, if the time limit bar graph is longer than the power demand bar graph, the power demand should fall below the target value at the end of the time limit.
On the other hand, if the bar graph for the time limit is shorter than the bar graph for the power demand by 1, it can be visually known that the power demand may exceed the target value at the end of the time limit. In such a case, it is necessary to take measures to prevent the target value from being exceeded by adjusting the load.

In this way, the lengths of both bar graphs can be monitored, and the relative relationship between the lengths can be used to determine how the power demand is in relation to the target value.

The configuration and operation of the above conventional example will be explained in more detail with reference to the circuit block diagram of FIG. In the figure, a pulse signal transmitted from a power meter with a transmitting device (51) corresponding to the amount of power consumed by the load is transmitted by a pulse conversion circuit (52).
) is converted into a pulse signal for each unit of electric energy.

The unit power m indicates the target power demand value, and the corresponding power demand display (33L+ to 33Ln)
The value divided by the number of

This pulse signal for each unit of electric energy is transmitted through a shift register (6
1S1 to 61Sn) as clock signals.

In other words, initially everything is at L level, but when the first pulse signal arrives, the first stage shift register (
61S+) becomes H level, and the next pulse signal causes the first stage (61S+) and second stage (61S2) shift registers to go H level. In this way, the reception is performed by a shift register (61Sl) with a number of stages equal to the number of pulse signals received.
~61Sn> becomes H level. This level change causes the driver circuits (71Dl to 71Dn) directly connected to the respective stages of the shift registers (61Ss to 61Sr+) to
) for demand power display (33Ll to 33Ln)
Controls lighting/extinguishing of lights. In other words, the shift register (6
By lighting up the indicators (33Ll~, 33Ln) corresponding to the H level in 1S+~61Sn>, the number of lights on the indicators (33Ll~33Ln) will change up to that point. This shows the demand power consumed during the period. On the other hand, a clock pulse signal at regular intervals transmitted from a clock device (81) is converted into a pulse signal for each unit time by a pulse conversion circuit (82).

The unit time is a value obtained by dividing the specified power demand time limit by the number of the power demand display devices (33Ll to 33t, n). This pulse signal for each unit time is transferred to a shift register (62S
1 to 62Sn) as clock signals. In other words, initially everything is at L level, but when the first pulse signal arrives, the first stage shift register (62
S+) becomes H level, and the next pulse signal causes the first
The shift registers of the stage (62S1) and the second stage (62S2) become H level. In this way, the number of stages of shift registers (62Sl to 62Sl to
62Sn) becomes H level. This level change controls the lighting and extinguishing of time indicators (43L+ to 43Ln) via driver circuits (72Dl to 72D0) directly connected to the respective stages of the shift registers (62S+ to 62Sn). That is, the shift register (6231~
62Sn>, the display corresponding to the H level (
431,+~43Ln) are lit, the number of lit indicators (43Li~4sLn) indicates the time that has passed up to that point.

Displays (33Ll to 33Ln and 43Ln and 43Ln) as described above
Ll to 43Ln) are lit up sequentially in the form of a bar graph, but when the specified demand time period has elapsed, the corresponding indicator (4
3Ln) lights up, the time limit ends, and the shift register (
62Sn) to transmit a reset signal (9). Due to this reset signal (9), the time limit shift registers (62S1 to 62Sn) and the power demand shift registers (61S1 to 61Sn) all return to the L level, and the time limit starts.

[Problems to be Solved by the Invention] In the conventional power demand monitoring device as described above, all the indicators corresponding to the power demand and elapsed time from the start of the time limit to an arbitrary point must be lit. power consumption increases. As the amount of power consumption increases, the amount of heat generated also increases, which requires countermeasures against the heat, resulting in the problem of an increase in the size of the device.

Furthermore, since the power demand display group (33L) only displays up to a predetermined target value, there is a problem in that it is difficult to determine whether the power demand has exceeded the limit at the end of the time limit.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a power demand monitoring device that can be miniaturized and that can determine the extent to which the power demand exceeds a target value. do.

[Means for Solving the Problems] A power demand monitoring device according to the present invention includes: a group of time limit indicators that display the elapsed time of a demand time limit and are provided in a substantially linear manner; display the amount of power used in the demand time period based on the number of pulses received, and are arranged substantially in a line parallel to each other with the display start side end aligned with the display start side end of the display group for the time period; A power demand display group whose other end extends from the position corresponding to the other end of the display group, and each block obtained by dividing each of the above display group into a predetermined number of blocks. and display group driving means for driving the display group.

[Operation] In the present invention, the display group for time limit and the display group for power demand, which is longer than this display group, are each divided into a predetermined number of blocks, and each block is driven.

[Example code] FIG. 1 is a block diagram showing one embodiment of the present invention.

Input interface (21) in the power demand monitoring device (1)
) receives a number of pulses corresponding to the amount of power consumed by the load from a power meter with a transmitting device (51) located outside the device. The output of the input interface (21) is sent to the arithmetic processing unit (2
4). The arithmetic processing unit (24) further includes a setting unit (22) for setting target values, etc., and a clock unit (22) for ticking time.
3) Read the data and perform calculations.

The calculation processing unit (24) drives the driver circuit (25) based on the calculation result, and displays the power demand display group (33).
L) and time limit display group <431) are turned on as many times as necessary. This arithmetic processing unit (24) and driver (2
5) constitutes a display group driving means (26).

FIG. 2 is a front view showing a display group provided on the front side of the power demand monitoring device according to an embodiment of the present invention. The casing of this device is the same as the conventional power demand monitoring device shown in FIG. 3, so illustration and description will be omitted. In Figure 2,
The display group (33L) for power demand consists of nn displays (3
3LL, 33L2, 33L3.・-・33Ln, 33
Ln+1. + H+ 33Lnn) are arranged in a strip shape in a continuous manner adjacent to each other, and are lit up in a bar graph shape in accordance with the elapsed time, and the power demand value at that point can be read from the scale value (34). It looks like this. In the example shown in the figure, the scale value (34) indicates O at the start of the time limit and a target value of 100 (%) at the end of the time limit. On the other hand, the time limit display group (43L) has n indicators (43L1.43L2, 43L3.-...
43Ln) are arranged in a strip shape in a continuous manner adjacent to each other, and are sequentially lit in a bar graph shape corresponding to the elapsed time of the demand time limit, so that the elapsed time at that point can be read from the scale value (44). It has become. In the example shown in the figure, the scale value (44) indicates 0 at the start of the time period and 30 (minutes) at the end of the time period.

Next, the lighting order of these display groups (33L, 43L) will be explained in detail. Display group for power demand (33
L), 33L2.
33L3°...33Ln-1, 33Ln are lit.

Similarly, in the time limit display group (43L), the leftmost display (
43L+) sequentially from 43L2, 43L3...43Ln
-1,43Ln is lit. Furthermore, in the power demand display group (33L), the scale value (34) is 100 (
%), that is, even if the target value is exceeded, the display (33
Ln+1.33Ln+2. ...33Lnn) are turned on in sequence.

Once the indicators are lit according to the above lighting order, they do not continue to be lit until the end of the time limit, but are turned off in blocks. That is, in the power demand display group (33L), the displays (33Ll to 33L5) are the first block, the displays (33L6 to 331.+o) are the second block, and so on.
(33Ln-4 to 33Ln) in the nth block, (33Ln-4 to 33Ln),
n+1 to 33Ln+5) as the (n+1)th block,
All the indicators of the first block (3311 to 33L5) are lit, and the indicators of the second block (33La to 331.
+n) starts to light up, the first block indicator (33L) starts to light up.
1 to 33L5) are all turned off. In the same way, all the n-block indicators (33Ln-4 to 33Ln) turn on in order, and the (n+1)th block indicator (33Ln+) lights up.
1 to 33Ln+5) start to light up, all the indicators of the n-th block (33Ln-4 to 33Ln) are turned off. In the display group for time limit (43L), the display (43L)
1~43L5) as the first block, (43L6~43LI
Q) to the second block, and the following (43Ln-4~
43Ln) as the n-th block, and the indicators are lit in block units as in the case of the display group for demand power (33L).

In addition, in the above embodiment, the case where each block is lit is described, but as an exception, when the scale value (34) is 100,
In the blocks before and after (%), all indicators (33Ln-4 to 33Ln) of the blocks before 100(%) remain lit even when moving to the block after 100(%), and The monitor's attention may be called to attention by, for example, changing the display color for each block.

[Effects of the Invention] As described above, according to the present invention, the terminal end of the display group for demand power is extended from the terminal end of the display group for time limit, that is, the position corresponding to the expiration position of the demand time limit. This has the effect that it can be easily determined whether the demand power exceeds the target value. Furthermore, since each display group is turned on as a block, power consumption and heat generation can be suppressed, and the entire device can be miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a power demand monitoring device according to an embodiment of the present invention, FIG. 2 is a front view showing a display group of the device, and FIG. 3 is a perspective view showing a conventional power demand monitoring device. FIG. 4 is a block diagram showing the conventional device. In the figure, (26) is display group driving means, (33L)
(43L) is a display group for power demand, (43L) is a display group for time limit, and (51) is a power meter with transmitter. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) Displays the elapsed time of the demand time period, and displays the amount of electricity used in the demand time period based on a group of time limit indicators arranged in a substantially linear manner and the number of pulses emitted from the wattmeter. and a position where the display start side end is aligned with the display start side end of the display group for time limit, and is arranged substantially in a line, and whose other end corresponds to the other end of the display group. A power demand monitoring device comprising a longer display group for power demand, and a display group driving means for driving each block obtained by dividing each of the above display groups into a predetermined number of blocks. .