JPH0216459A - Electronic watt-hour meter - Google Patents

Abstract

PURPOSE:To obtain the reliable electronic watt-hour meter by dividing consumption which is estimated by unit prices by the charge for electric power by the unit prices per unit time and thus calculating the rest use time of electric energy. CONSTITUTION:A power consumption estimated quantity calculating means 1 calculates estimated power consumption in a following specific period from the power consumption per unit time which is obtained so far. Then a unit-price classified estimated consumption calculating means 3 calculates the power charge by the unit prices per unit time up to now. Then a rest use time calculating means 7 divides the estimated power consumption by the unit prices by the power charge by the unit prices in unit time to calculate the rest use time of electric energy. Consequently, even if the unit price of the power charge is changed, neither the rest use time nor the usable power consumption need not be varied suddenly and the reliable electronic watt-hour meter is obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention operates to supply an amount of electricity corresponding to a prepaid electricity rate, and also to supply an amount of electricity corresponding to a prepaid electricity rate. The present invention relates to an electronic power meter that calculates the remaining usage time of the power amount by subtracting the amount of power used.

(Prior Art) This type of electronic watt-hour meter allows users to insert a so-called prepaid card, which can be obtained by paying the electricity bill in advance, to receive electricity corresponding to the prepaid electricity bill recorded on the prepaid card. Although it supplies M,
With this prepaid card type electronic power hanging meter, it is necessary to inform the electricity consumer how much electricity can be used with the prepaid card currently in use, so it is necessary to inform the electricity consumer how much electricity can be used with the prepaid card currently in use. The amount and remaining usage time are estimated and displayed.

The usable power amount and remaining time are conventionally calculated according to the following formula.

Usable power amount = Card balance / Unit price of electricity rate Remaining time - Available power amount / Current power usage per unit time ω In other words, the available power amount is the balance recorded on the current prepaid card. It is calculated by subtracting it by the unit price of the charge, and the remaining time is calculated by dividing this available power amount by the current amount of power used per unit time, and these calculated values are displayed.

Incidentally, electricity rates usually adopt the increasing rate unit price method, but this increasing rate unit price method is a rate system in which the electricity rate increases according to the electricity consumption a of the month, for example, as shown in the following table. Monthly usage is O~120kWh, 120~2
It is divided into three stages: 00kWh, 200kWh or more, and the unit price of electricity is A yen for 0 to 120kWh, 8 yen for 120 to 200kWh, and 20
It changes according to each amount of power used so that it becomes 0 yen for 0 kwh or more.

Note that the unit price is set to be higher as the amount used is larger, such as A<B<C. Further, the usage amount for the current month is cleared to zero, for example, on the 1st of every month.

(Problem to be Solved by the Invention) In conventional electronic watt-hour meters, when the unit price of electricity is changed, the calculated values of available power and remaining usage time displayed as described above suddenly change. There is a problem in that the display changes and presents an unstable display to consumers.

The present invention has been made in view of the above, and its purpose is to continuously and gradually change the display of available power and remaining usage time without sudden changes even if the power rate changes. The purpose of the present invention is to provide an electronic watt-hour meter that changes to

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the electronic watt-hour meter of the present invention operates to supply an amount of electricity corresponding to the prepaid electricity fee. At the same time, it is an electronic watt-hour meter that calculates the remaining usage time of electricity by subtracting the amount of electricity used from the prepaid electricity fee, and as shown in Figure 1, it calculates the amount of electricity used per unit time up to now. an estimated power usage amount calculation means 1 for calculating an estimated amount of power usage in a future predetermined period based on usage amount; and an estimated amount of power usage calculation means 1 calculated by the estimated amount of power usage calculation means based on a power amount incremental charge unit price method. a unit price-specific estimated usage amount calculation means 3 for calculating the estimated usage amount by unit price of 4; a unit price-specific electricity rate calculation means 5 for calculating the unit price cut-off power r1 money per unit time for the power consumption per unit time; Remaining usage time calculation in which the remaining usage time of electricity is calculated by dividing the estimated usage m by unit price calculated by the separate estimated usage calculation means by the electricity rate per unit time calculated by the electricity rate calculation unit by unit price. The gist is to have means 7.

(Function) The electronic watt-hour meter of the present invention calculates the estimated usage amount per unit price in the increasing rate unit price method for the estimated amount of power usage calculated for a future predetermined period, and calculates the estimated usage amount per unit price per unit time. The remaining usage time of the amount of electricity is calculated by dividing it by the unit price of electricity.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a block diagram showing the configuration of an electronic power meter according to an embodiment of the present invention. In the figure, a power line 11 is connected to the power supply side via a terminal 13, and is also connected to a load-side power line 17 via a breaker 15, and from this load-side power line 17 via a terminal 19, a load and a power line are connected. In other words, it is connected to various devices on the consumer side, so that power from the power supply side is supplied to the load.

The power line 17 on the load side via the breaker 15 is connected to the power measurement bag @21, so that the power supplied to the load via the power line 17 is measured. This power amount measuring device 21 is connected to a control device 23, and the power 1 measured by the power amount measuring device 21 is also supplied to the control device 23.

The control device 23 also includes a magnetic card reader/writer 25.
This magnetic card reader/writer 25 has a prepaid card inserted therein, reads the electricity rate recorded on the prepaid card, and supplies the read electricity rate to the control device 23. It has become.

The control device 23 stores the power rate of the prepaid card supplied from the magnetic card reader/writer 25,
The amount of power used measured by the power amount measuring device 21 is converted into a power charge, this power charge is subtracted from the power charge recorded on the prepaid card, and the remaining power charge is calculated via the magnetic card reader/writer 25. This is recorded on the prepaid card, and when the remaining power charge recorded on the prepaid card becomes zero, the brake 15 is shut off and the supply of power to the load side is stopped.

The control device 23 is also connected to a display device 27, which includes a magnetic card reader/writer 25.
It is designed to display the amount of power that can be used in the future based on the electricity rate recorded on the prepaid card inserted in the card, as well as the remaining amount of available power and remaining time.

By looking at the display of the available power amount and remaining time, the consumer can estimate and prepare the next time to insert a prepaid card.

This usable power amount and remaining time are calculated according to the following procedure in the control device 23.

(1) Estimate the amount of electricity used for the current month from the current amount of electricity used per unit time. This can be calculated, for example, by dividing the usage amount to date by the usage time to date to calculate the usage amount per unit time, and then multiplying this usage per unit time m by the usage time for the current month (2) Usage amount for the current month calculated as described above (estimated value)
are categorized by each unit price of the increasing rate unit price method described above, and the number of flights by unit price for the current month is calculated.

(3) For next month, the usage amount for next month is estimated in the same way, and the amount of stool by unit price for next month is calculated.

(4) Calculate the usage charges for the current month's and next month's usage calculated as described above for each unit price, and record the calculated usage charges on the prepaid card inserted in the magnetic card reader/writer 25. The amount is sequentially subtracted from the current electricity charge. In other words, first subtract the usage fee for unit price A for the current month, then subtract the usage fee for unit price B for the current month, then subtract the usage fee for unit price C for the current month, then subtract the usage fee for unit price A for next month, and then subtract the usage fee for unit price A for the next month. Similarly, next month's 8 unit price, then next month's C
The usage charges are subtracted in chronological order, such as by subtracting the usage fee from the unit price.

(5) Then, calculate the time when the result of this subtraction becomes zero.

(6) Calculate the remaining usable time from the remaining charge of the prepaid card by counting backwards from the time when the above-mentioned subtraction result becomes zero.

(7) Calculate the available power amount by multiplying this remaining time by the current usage amount per unit time (remaining time x current usage amount per unit time).

The remaining time and available power amount calculated as described above are displayed on the display device 27 from the control device 23.

FIG. 3 is a flowchart showing this procedure, and the operation will be explained next with reference to this flowchart.

First, in estimating the amount of stool per unit price, it is first checked whether the current month's elapsed usage ff1Wh (5 cycles) is less than or equal to 120 kWh of the smallest unit price class of the increasing rate unit price method (step 110). 120). If the current month's elapsed usage ff1Wh (5 guesses) is less than 120 kWh, then it is further checked whether the current month's estimated usage liwh (5 guesses) is 120 kWh or less (step 130).

As a result of this check, the estimated usage for the current month is ff1Wh (
5) is less than 120kWh, step 170
As shown in the table below, use the current month's estimated unit price to the unit price mwh
<This A) is calculated as [estimated usage iWh of this month (5 guesses) - elapsed usage amount of this month wh (5 guesses)].

Also, in the check in step 130, the estimated usage f for the current month is
If the iWh (5 estimates) is not less than 120kWh, the estimated usage ft1Wh (5 estimates) for the current month is 20OkW.
It is checked whether it is less than or equal to h (step 140).
, in the case of 200kWh or less, use the current month's unit price estimate to the unit price as shown in the table in step 170.ff1W
h (Current A) is [120 - current month's elapsed usageff1Wh
(5)], and the estimated unit price usage of unit price B for the current month awh < current B) is [estimated usage MWh for the current month
(5 guesses) Calculated as -1201. Also, 20
If it is not less than 0 kWh, as shown in the table in step 170, the estimated unit price usage MWh (current A) of unit price A for the current month is [120 elapsed usage fiWh for the current month (5 seasons)]
Calculated as JiW
h (Current B) is excluded as 80 (=200-120), and furthermore, the unit price C is estimated to be used in the current month IWh
(C) is [Estimated usage of this month ff1Wh (5 guesses) -
It is calculated as 2003.

Furthermore, by checking in step 120, the elapsed usage of the current month is checked.
If wh < 5) is not less than 120kWh,
It is checked whether the current month's elapsed usage mWh (5 cycles) is less than 200 kWh (step 150),
If it is less than 0kWh, the estimated usage mwh for the current month
It is checked whether or not the power consumption (<5 guesses) is 200 kWh or less (step 160). As a result of this check, if the current month's estimated usage Wh (5 guesses) is less than 200 kWh, as shown in the table in step 170, the current month's unit price state estimated usage mwh <current A) of unit price A is naturally O, Unit price B
Estimated unit price usage MWh for the current month - (current B) is "Estimated usage for the current month wh <5 guess) - Elapsed usage for the current month Wh (
5)].

Also, in the check in step 160, the estimated usage M for the current month
If Wh (5 thrust) is not less than 200kWh,
As shown in the table in step 170, the estimated unit price usage of unit price A for the current month mwh < current A) is O, and the estimated usage of unit price for unit price B for the current month fitWh (current B) is [200 -
Calculated as the elapsed usage amount for the current month (Wh (5)),
Estimated usage amount by unit price Wh (current C) for the current month of unit price C is [
Estimated usage for the current month ff1Wh! (5 guesses) -20,0].

Furthermore, by checking step 150, the current month's elapsed usage I
If IWh (5) is not less than 200 kWh, as shown in the table in step 170, the estimated usage by unit price for the current month of unit price A fiWh (current A) and the estimated usage by unit price for the current month of unit price B wh < current B ) becomes 0, and the unit price C
Estimated unit price usage ffi W h (current C) for the current month is [Estimated usage IWh (5 guesses) for the current month - Elapsed usage fl for the current month]
iWh (5 meridians)].

As described above, the estimated usage IWh (current A, B, C) of the current month for each unit price A, B, and C is calculated as shown in the table in step 170.

Next, using the same method, next month's estimated unit price usage faWh (next A, B, C) is calculated for each unit price for next month. That is, first, in step 180, it is checked whether next month's estimated usage faWh (future estimate) is less than 120 kWh, and if it is less than 120 kWh, next month's usage of unit price A is checked as shown in the table in step 200. Estimated unit price usage IWh (Next A) is determined as next month's estimated usage Wh (Next).

If it is not 120kWh or less, it is checked whether next month's estimated usage IWh (previous estimate) is 200 or less (step 190), and if it is 200kWh or less, as shown in the table in step 200. Next month's estimated usage by unit price IWh (Next A) for unit price is calculated as 120, and next month's estimated usage by unit price of unit price B mwh <Next Japan) is [Next month's estimated usage ff1Wh C next estimate) - 12
0].

Furthermore, next month's estimated use of 1fWh (next estimate) is 200k.
If it is not less than wh, the estimated use of unit price A next month by unit price ff1Wh (next, A) is calculated as 120,
Estimated usage by unit price Wh (next B) for next month of unit price B is 8
0 (=200-120), and the estimated usage by unit price of next month mwh <next C) of unit price C is calculated as [next month's estimated usage mwh <next estimate) - 200].

As described above, the estimated use ff1Wh (next A, B, C) for each unit price A, B, C next month is calculated as shown in the table in step 200.

Estimated usage by unit price for the current month and next month ff1Wh (to this), Wh (this B), Wh (this C), Wh (next A), Wh
When (Next B) and Wh (Next C) are calculated respectively,
Multiply each of these by the unit prices ASB and C1 to calculate the corresponding charges ¥ (this A), ¥ (this B), ¥ (this C), ¥ (
Calculate next A), ¥(next B), ¥(next C) (step 2
10).

Next, the remaining time is calculated from each charge calculated in this way. First, subtract ¥ (A) from the remaining charge of the prepaid card (remaining), and set this subtracted value as ¥', Check whether this value \' is less than or equal to 0 (
Step 220).

If this value ¥' is less than O, the remaining charge of the prepaid card (remaining tWO ) to calculate the remaining usable time H (possible) (steps 230, 310>).

In addition, if the check in step 220 is not less than 0, the unit price A is estimated to be used by unit price for the current month wh (this A
) to calculate the time H' (acceptable) by dividing the charge per unit time WO-A by unit price. > is subtracted, the subtracted value is set to the value ¥'', and it is checked whether this value is less than or equal to O (step 250).
).

If it is less than 0, the value ¥' calculated in step 220 divided by the unit price per unit time rate Wo-8 is added to the time H' (acceptable) calculated in step 240, and it can be used. Calculate the remaining time H (possible) (step 260
, 310).

In addition, if the check in step 250 is not less than O, ¥ (etc.
The time H' calculated in step 240 is added to the time divided by
(Acceptable) is added to H゛(Acceptable) in step 270), and the value calculated in step 250 is ¥''.
The calculated value of (C) is set as ¥'''', and it is checked whether this value Y'''' is less than or equal to O (step 280).
.

If the value is 0 or less, the value ¥'' calculated in step 250 is divided by the unit price Wo-C per unit time, and the value is added to the time calculated in step 270 (acceptable). Calculate the remaining time (possible) (step 290.3
10).

In addition, if the check in step 280 is not less than O, ¥ (this C) is calculated as the unit price per unit time rate WO・C.
The time H'' calculated in step 270 above is divided by
(Acceptable) is added to H''' (Acceptable) (step 300), and the same process is repeated to calculate the remaining usable time H(Acceptable) for each case.Then, The remaining time H calculated in this way (
The available power amount can be calculated by multiplying the current amount of power used per unit time.

[Effects of the Invention] As explained above, according to the present invention, the estimated usage amount by unit price in the increasing rate unit price method for the estimated power usage period calculated for a future predetermined period is calculated, and the estimated usage amount by unit price is calculated. The remaining usage time of electricity is calculated by dividing it by the unit price of electricity per unit time, so even if the unit price of electricity changes, the calculated and displayed remaining usage time and available electricity will not change. It does not change abruptly like in the past, but changes continuously and gradually, so there is no unstable display to consumers, and it is highly reliable.

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to claims of the present invention, FIG. 2 is a block diagram of an electronic watt-hour meter according to an embodiment of the present invention, and FIG. 3 is a flowchart showing the operation of the electronic watt-hour meter of FIG. 2. It is. 1... Means for calculating estimated electricity consumption 3... Means for calculating estimated consumption by unit price 5... Means for calculating electricity charges by unit price 7... Means for calculating remaining usage time

Claims (2)

[Claims] (1) An electronic electricity meter that operates to supply the amount of electricity equivalent to the prepaid electricity rate, and calculates the remaining usage time of the electricity by subtracting the amount of electricity used from the prepaid electricity rate. an estimated amount of power usage calculation means for calculating an estimated amount of power usage in a predetermined period in the future based on the amount of power used per unit time up to the present; an estimated usage amount calculation means for each unit price that calculates the estimated usage amount by unit price of the estimated power usage amount calculated by the estimated amount calculation means; The remaining power usage is calculated by dividing the estimated usage amount by unit price calculated by the power rate calculation means and the estimated usage amount by unit price calculation means by the power rate by unit price per unit time calculated by the power rate by unit price calculation means. An electronic watt-hour meter characterized by having a remaining usage time calculation means for calculating the time. (2) The remaining usage time calculation means has a means for calculating the remaining usable power amount based on the remaining usage time between electric powers and the power usage amount per unit time. Electronic energy meter.