JPH0216460A - Electronic watt-hour meter - Google Patents

Abstract

PURPOSE:To obtain the electronic watt-hour meter which suppresses a waste of power consumption by receiving the driving power supply for a power circuit part from a load-side feeder line from a power cutoff means which stops feeding electric power when the rest use power consumption becomes zero to a load. CONSTITUTION:An electric energy metering part 7 calculates the power consumption from a current detected by a current detector 8 provided to a load-side feeder line 13 connected to an outdoor feeder line 11 through a breaker 9 and outputs it to a control circuit part 5. The control circuit part 5 subtracts it from the rest use power consumption in order and operates the breaker 9 when the rest use electric energy becomes zero to stop feeding electricity to the load side. Then the driving power source for the power circuit part 15 which supplies electric power to respective electronic circuit parts of the watt-hour meter 10 is obtained from the load-side feeder line 13 to feed electricity to the load only when that is possible, so the waste of power consumption is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention 1 (Field of Industrial Application) The present invention relates to an electronic watt-hour meter that limits the use of electricity based on preset storage contents.

(Prior art) In recent years, so-called prepaid electricity consumption methods have been introduced, in which, for example, a ticket is purchased for an amount corresponding to the amount of electricity that can be used, and electricity is supplied to the consumer based on the electricity amount data stored in this ticket. Research on the total (11 shots are being pushed forward).

FIG. 2 shows a conventional example of such a prepaid electricity meter 10. In the figure, 1 is a ticket made up of, for example, a magnetic card, and stores data on the amount of power equivalent to the amount paid, ie, the amount of power m that can be used. The data stored in the ticket 1 is read by a magnetic card reading/writing device (hereinafter simply referred to as an "rR/W device") 3 and stored in the control circuit 5 as the amount of remaining power to be used. The control circuit unit 5 serves as the control center of the power meter 10, and mainly subtracts the power consumption cost m based on the power measurement pulse from the power M gf Q unit 7 sequentially from the remaining power used. When the remaining power (h) used becomes zero, the breaker 9 is operated to cut off power supply to the load side.

Note that the power metering section 7 is configured to measure the current detected by a current detector (for example, a through-type CT) 8 installed in a load-side power supply line 13 connected to an outdoor power supply line 11 via a breaker 9. The breaker 9 can be controlled manually or automatically.

Therefore, according to this electricity meter 10, the consumer can use only the amount of electricity commensurate with the amount of the purchased ticket 1.

(Problem to be Solved by the Invention) By the way, the power M meter 10 mentioned above (above) includes the R/W device 3, the control circuit section 5, and the power M metering section 7, which are the constituent elements.
etc., a power supply circuit section 15 is built in because a required driving voltage is required. The power supply circuit section 15 receives power directly from the outdoor power supply line 11 and constantly supplies a predetermined driving voltage to each component through voltage transformation processing and the like.

However, the power supply by the above-mentioned power supply circuit section 15 does not necessarily necessarily need to be constant, but has the advantage that it is always in a standby state and can immediately start power supply control etc. after inserting an effective T-kerat. However, if you do not need power supply for a long time, use the power meter 1.
The power consumption of 0 itself becomes enormous, and it becomes a wasteful power consumption.

The present invention has been made in view of the above, and its purpose is to select an electronic watt-hour meter that suppresses wasteful power consumption.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, in a watthour meter that controls power supply to a load using a power supply cutoff means with a set remaining amount of power used as a limit, The present invention is characterized in that it includes a power supply circuit section that receives power from the power supply line from the power supply cutoff means to the load and supplies power to each of the electric circuit sections constituting the watt-hour meter.

(Function) In the electronic watt-hour meter according to the present invention, the driving power of the power supply circuit unit that supplies power to each electric circuit unit constituting the watt-hour meter is received from the power supply line to the load from the power supply m1li means. , power is supplied to each electric circuit section only when power can be supplied to the load.

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

FIG. 1 shows an embodiment of the present invention, the feature of which is that the driving power for the power supply circuit section 15 is received from the load-side power supply line 13 from the breaker 9 to the load.

Components that are the same as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted here.

Next, the operation of this embodiment will be explained.

Since the breaker 9 is in the cutoff state when the value of the remaining amount of power stored in the control circuit section 5 is zero, power is not supplied to the load and the power supply circuit section 15.
Control circuit section 5 of electricity meter 100. R/W device 3. Electric power M
Power is not supplied to the electric circuit section such as the total ω section 7, and the power meter 100 is in a standby state for insertion of the R/WH device 3 of the ticket 1 without consuming any power.

When starting the operation of the power meter 100 in such a standby state, the consumer first manually closes the breaker 9.
energized. By energizing the breaker 9, power supply to the power supply circuit section 15 is started, and accordingly, the power supply circuit section 15 starts operating and starts supplying the necessary voltage to the control circuit section 5 and the like.

The control circuit unit 5 receives power from the power supply circuit unit 15, and first maintains the energized state of the breaker 9 for a maximum predetermined time, and also sets the remaining power 6 to be used by inserting the ticket 1 into the R/W device 3. to go into.

That is, within this predetermined time, the control circuit section 5:
When R/W device 3 inserts ticket 1, this ticket 1
Receive the data read from as the remaining ff1f ability,
Confirm that it is not zero and memorize it. Thereby, the watt-hour meter 100 can start supplying power to the load using this remaining amount of power as the limit. In this process, if the data read from the ticket 1 is zero, the control circuit section 5 immediately turns off the breaker 9 and returns to the standby state. Further, in this process, even if the ticket 1 is not inserted into the R/W device 3 within the predetermined time, the control circuit section 5 will turn off the breaker 9 and return to the standby state.

On the other hand, within the predetermined time period, it is possible to supply power to the load even before the usage remaining power meter is stored, but if the load is started to operate before this storage, the control circuit section 5 The power metering unit 7 receives the power consumption maximum calculated based on the current detected by the current detector 8, and since the remaining power M is before setting, that is, it is zero, the breaker 9 is also shut off and the system enters the standby state. return.

Therefore, according to this embodiment, the breaker 9 essentially functions as a watt-hour meter only when it is energized, and stops functioning as a watt-hour meter when it is not energized, resulting in unnecessary power consumption. It is economical because there is no power supply loss at the power company.

[Effects of the Invention] As explained above, according to the present invention, the drive power of the power supply circuit section that supplies power to each electric circuit section constituting the electronic watt-hour meter is connected from the power supply cutoff means to the power supply line to the load. [Pu,
Since power is supplied to each electric circuit section only when power can be supplied to the load, wasteful power consumption can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional example. 1...Ticket 3...R/W device 5...Control circuit section 7...Electric energy metering section 8...Current detector 9...Breaker 10...Electric energy meter 11...・Outdoor side power supply line 13...Load side power supply line 15...Power circuit section 100...Water consumption meter

Claims (1)

[Claims] In a watt-hour meter that controls the power supply to the load using a power supply cutoff means up to a set remaining power consumption,
An electronic watt-hour meter comprising a power supply circuit section that receives power from the power supply line from the power supply cutoff means to the load and supplies power to each of the electric circuit sections constituting the watt-hour meter.