JP2009222432A - Watt-hour meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watt-hour meter for annunciating power stoppage duration even in the course of power stoppage. <P>SOLUTION: In the course of power stoppage, a signal for starting a control part 111 is generated from a timer part 106 at fixed time intervals, power stoppage duration is calculated in the control part 111 from power stoppage occurrence time and current time, and the stoppage duration is annunciated by means of display or transmission. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a watt-hour meter that measures the amount of power used by a system under measurement.

Conventionally, watt-hour meters that measure the amount of power used by ordinary households, factories, and offices have become widespread. The watt-hour meter displays a usage amount detecting means for measuring the used power amount of the system to be measured, a control portion for editing the usage amount detected by the usage amount detecting means into data, and data edited by the control portion. And a display unit. (For example, Patent Document 1)
JP 2004-226094 A (page 10, FIG. 2)

The conventional watt-hour meter counts the duration of power failure within the watt-hour meter when the power failure occurs. If the power failure continues for a certain period of time, the display device is turned off to reduce the consumption of backup power such as batteries. Had been working. However, since there was no means to notify the duration of the power outage to the outside, it was difficult to determine whether the watt hour meter display etc. was extinguished or the watt hour meter failed due to the continued power outage. Met.

In recent years, a fee system has been introduced that discounts the electricity charge according to the duration of power outage, and it has become important to notify the customer who wants to know the discount amount of the duration of the power outage.

  However, the conventional watt-hour meter has no means for notifying the customer of the power outage duration.

  An object of this invention is to provide the watt-hour meter which can alert | report the power failure continuation time also during a power failure in view of the said problem.

In order to achieve the above object, the watt-hour meter according to the present invention comprises a power failure detection means for detecting a power failure of an external power supply, a time measurement means for measuring a current time and generating a periodic signal at regular time intervals, and the power failure When a power failure is detected by the detection means, a power failure occurrence time storage means for storing the time measured by the time measuring means as a power failure occurrence time, and the operation is stopped when a power failure is detected by the power failure detection means, When a periodic signal generated by the time measuring means is input and when a power failure recovery is detected by the power failure detecting means, the operation is started and the current time measured by the time measuring means and the power failure occurrence time storage means are stored. Control means for calculating the power outage duration from the stored power outage occurrence time, and notification means for informing the power outage duration calculated by the control means And wherein the door.

  ADVANTAGE OF THE INVENTION According to this invention, the watt-hour meter which can alert | report a power failure continuation time also during a power failure can be provided.

  Examples of the present invention will be described below.

  A first embodiment of a watt-hour meter according to the present invention will be described with reference to FIG. FIG. 1 is an internal configuration diagram showing a first embodiment of a watt-hour meter according to the present invention.

  In FIG. 1, 100 is a watt-hour meter main body.

101 is a terminal portion, and a conductive portion made of a conductive metal such as brass or copper is composed of a fixed portion made of a material such as a phenol resin, a PBT resin, or a highly insulating plastic, An external distribution line is connected. The 1S, 2S, and 3S terminals are connected to a power supply side distribution line that receives power from a power supply company, and the 1L, 2L, and 3L terminals are connected to a load side distribution line that supplies power into the consumer. In this embodiment, a single-phase three-wire electronic watt-hour meter is shown.

Reference numerals 102a and 102b denote current detection units, each of which includes a circuit that combines a current transformer and an analog-digital converter. The current detection unit 102a generates a current between the terminals 1S-1L of the terminal unit 101 (one-side current). The current detection unit 102b detects the current (3-side current) between the terminals 3S-3L, converts it into digital data that is directly proportional to the current used by the consumer, and outputs the digital data.

Reference numeral 103 denotes a voltage detection unit, which includes a circuit that combines a voltage transformer and an analog-digital converter. The voltage between terminals 1S-2S and between terminals 3S-2S (referred to as 1 side voltage and 3 side voltage, respectively). ) Is detected, converted to digital data that is directly proportional to the voltage used, and output.

A power multiplication unit 104 includes a digital multiplication circuit and the like. The digital data signal is directly proportional to the one-side current output from the current detection unit 102a and the digital data is directly proportional to the one-side voltage output from the voltage detection unit 103. The digital data that is directly proportional to the three-side current output from the data and current detection unit 102a and the digital data that is directly proportional to the three-side voltage output from the voltage detection unit 103 are multiplied to obtain digital data that is directly proportional to the power consumed by the consumer. Convert and output.

A storage unit 105 is configured by a semiconductor memory such as a RAM, and stores usage data, which is power usage by consumers, and data such as power outage date / time, power outage recovery date / time, power outage duration, and cumulative power outage time. To do.

A timer unit 106 is constituted by a counting circuit having a crystal oscillation circuit, etc., which counts year / month / day / hour / minute / second and generates a periodic signal at regular intervals, for example, every minute.

A display unit 107 includes a liquid crystal display or the like, and displays usage data, which is the amount of power used by the customer, and data such as a power failure occurrence date / time, a power failure recovery date / time, a power failure duration time, and a cumulative power failure time.

A communication unit 108 is configured by an interface circuit such as a current loop, and is connected to an external device (not shown) such as a handy terminal, a telephone line, a network, etc., and usage data that is power usage of the consumer. In addition, data such as power outage occurrence date / time, power outage recovery date / time, power outage duration, cumulative power outage time, etc. are transmitted to the outside.

An operation unit 109 includes a push button switch and the like, and is operated manually from the outside.

Reference numeral 110 denotes a power failure determination unit, which includes a voltage comparison circuit or the like, and detects the presence or absence of an external AC voltage to determine whether or not a power failure has occurred.

Reference numeral 111 denotes a control unit configured by a microcomputer or the like, which edits digital data that is directly proportional to the power used by the customer output from the power calculation unit 104 as power data, stores it in the storage unit 105, and displays the display unit 107. Each operation such as display on the screen and transmission of the communication unit 108 is controlled.

Next, the operation of this embodiment will be described with reference to the program flow diagrams of FIGS. This program is stored in a program memory (not shown) in the control unit 111 and controls the operation of the control unit 111. The program shown in FIG. 2 is a main program, and the program shown in FIG. 3 is a subprogram that runs when an interrupt occurs.

In the main program shown in FIG. 2, the control unit 111 normally creates power data based on digital data directly proportional to the consumer's power output from the power calculation unit 104 and stores it in the storage unit 105. (Step 201). Further, the control unit 111 displays the power data on the display unit 107 (step 202). Next, the control unit 111 receives the power failure occurrence information from the power failure determination unit 110 and determines whether or not a power failure has occurred (step 203). If it is determined that there is no power failure, the generation of power data (step 201) is continued. If it is determined that a power failure has occurred, the control unit 111 receives data relating to the power failure occurrence time from the timer unit 106, stores it in the storage unit 105 as a power failure occurrence time T1, and displays it on the display unit 107 (step 204). Thereafter, the operation of the control unit 111 is stopped in order to reduce current consumption during a power failure (step 205). The watt-hour meter 100 operates using an external AC power source as a power source when no power failure occurs. If a power failure occurs, the watt-hour meter 100 is used as an internal backup power source composed of, for example, a lithium battery. (Not shown in the figure).

Next, the operation of the subprogram that operates when an interruption occurs during a power failure will be described with reference to FIG. The control unit 111 stops operation when a power failure occurs, but operates again by inputting a periodic signal generated by the timer unit 106, an operation signal generated from the operation unit 109, and a power failure recovery signal generated by the power failure determination unit 110. Start. The periodic signal generated by the timer unit 106, the operation signal generated by the operation unit 109, and the power failure recovery signal generated by the power failure determination unit 110 are input to the control unit 111 as so-called interrupt signals.

  The control unit 111, which has been stopped due to the occurrence of a power failure, receives the above-described interrupt signal and starts again. The control unit 111 determines whether it is reception of a regular signal from the timer unit 106 (step 301). The regular signal from the timer unit 106 is a signal generated to the control unit 111 at regular intervals during a power failure. When the control unit 111 performs a continuous operation, the power consumption increases, and the remaining amount of the backup power source configured by a lithium battery or the like is rapidly consumed. However, if a periodic signal is generated from the timer unit 106 at intervals of, for example, 1 minute and the control unit 111 operates only when the periodic signal is received, the current consumption of the entire watt-hour meter 100 is suppressed. The frequency of occurrence of the periodic signal is set by an external setting device (not shown in the figure) such as a handy terminal when the watt-hour meter 100 is shipped from the factory or installed in a consumer. Further, the frequency of occurrence of the periodic signal can be changed by an external setting device.

When it is determined that the periodic signal generated by the timer unit 106 is not received, the control unit 111 determines whether the operation signal is generated by the operation unit 109 (step 302).

When it is determined that the signal is a periodic signal generated by the timer unit 106 or an operation signal generated by the operation unit 109, the control unit 111 obtains information on the current time from the timer unit 106 and stores it in the storage unit 105. The power outage duration T3 of the current power outage is calculated from the power outage occurrence time T1 and the current time T2, and stored in the storage unit 105 and displayed on the display unit 107 (step 303). Further, the cumulative power failure time T4 after the watt-hour meter 100 is shipped from the factory is calculated, stored in the storage unit 105, and displayed on the display unit 107 (step 304). Since the watt-hour meter 100 is operating with a backup power source such as a lithium battery for the time corresponding to the cumulative power failure time T4, the cumulative power failure time T4 is directly proportional to the consumption of the backup power source. Since the capacity of the backup power source is known in advance, the remaining amount of the backup power source can be inferred from the cumulative power failure time T4.

Next, the control unit 111 determines whether the accumulated power failure time T4 exceeds the first set value (step 305). Here, the first set value is a time value set by an external device (not shown in the figure) such as a handy terminal when the watt-hour meter 100 is shipped from the factory or installed in a consumer. For example, one half of the total time during which the watt hour meter 100 can operate with the power source is set as the first set value. When it is determined that the accumulated power outage time T4 exceeds the first set value, the control unit 111 displays a warning on the display unit 106 that the remaining amount of backup power is low. (Step 306).

Next, the control unit 111 determines whether the accumulated power failure time T4 exceeds the second set value (step 307). Here, the second set value is a time value set by an external device (not shown in the figure) such as a handy terminal when the watt-hour meter 100 is shipped from the factory or installed in a consumer. For example, three quarters of the total time during which the watt hour meter 100 can operate with the power source is set as the second set value. When it is determined that the accumulated power outage time T4 exceeds the second set value, the control unit 111 turns off the display unit 107 to reduce current consumption (step 308).

Next, the control unit 111 determines whether the accumulated power failure time T4 exceeds the third set value (step 309). Here, the third set value is a time value set by an external device (not shown in the figure) such as a handy terminal when the watt-hour meter 100 is shipped from the factory or installed in a consumer. For example, 7/8 of the total time during which the watt hour meter 100 can operate with the power source is set as the third set value. When it is determined that the accumulated power failure time T4 exceeds the third set value, the control unit 111 stops the timer unit 106 in order to further reduce current consumption (step 310).

Thereafter, the control unit 111 is stopped (step 311) and returns to the original standby state.

On the other hand, if it is determined in step 302 that the operation signal is not generated by the operation unit 109, the control unit 111 determines whether the signal is a power failure recovery signal generated by the power failure determination unit 110 (step 312). When it is determined that the power failure recovery signal is generated by the power failure determination unit 110, the power failure recovery time T5 is stored in the storage unit 105 by the control unit 111 and displayed on the display unit 105 (step 313).

Next, information on the current time is obtained from the timer unit 106 by the control unit 111, and the power outage duration T3 of the current power outage is calculated from the power outage occurrence time T1 and the power outage recovery time T5 stored in the storage unit 105. It is stored in the storage unit 105 and displayed on the display unit 107 (step 314). Further, the cumulative power failure time T4 after the watt-hour meter 100 is shipped from the factory is calculated, stored in the storage unit 105 and displayed on the display unit 107 (step 315). Further, the process jumps to the main routine in order to continue measuring the amount of power used (step 316).

On the other hand, if it is determined in step 312 that the power failure recovery signal is not generated by the power failure determination unit 110, the control unit 111 is stopped (step 311) and returns to the original standby state.

In addition, when there is a transmission request from an external device (not shown) such as a handy terminal, the control unit 111 transmits the power data, which is the amount of power used by the customer, the power failure occurrence time T1, the power failure, via the communication unit 108. Data such as return time T5, power failure duration T3, cumulative power failure time T4, and the like are transmitted via the communication unit 108.

If a present Example is used, the watt-hour meter which can alert | report the power failure continuation time also during a power failure can be provided.

In addition, since the power failure occurrence date / time, power failure recovery date / time, power failure duration time, and cumulative power failure time are displayed, it is possible to know the power failure occurrence status accurately. In particular, when a rate system that discounts the electricity charge according to the occurrence time of the power failure is adopted, it is necessary for both the customer and the power company to accurately grasp the power failure information such as the occurrence time of the power failure.

In addition, if this example is used, the operation part is manually operated, so the power outage date / time, power outage recovery date / time, power outage duration time, and cumulative power outage time are displayed. I can know.

  As described above, by using the present invention, it is possible to provide a watt-hour meter that can notify the duration of a power failure even during a power failure.

The internal block diagram which shows the structure of Example 1 of the watt-hour meter by this invention The program flow figure which shows the program of Example 1 by this invention The program flow figure which shows the program of Example 1 by this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Electricity meter main body 101 Terminal part 102a Current detection part 102b Current detection part 103 Voltage detection part 104 Power multiplication part 105 Memory | storage part 106 Timer part 107 Display part 108 Communication part 109 Operation part 110 Power failure discrimination | determination part 111 Control part

Claims (5)

A power failure detection means for detecting a power failure of the external power supply;
A time measuring means for measuring the current time and generating a periodic signal at regular time intervals;
When a power failure is detected by the power failure detection means, a power failure occurrence time storage means for storing the time measured by the timing means as a power failure occurrence time;
The operation is stopped when a power failure is detected by the power failure detection means, and the operation is started when a periodic signal generated by the timing means is input and when a power failure recovery is detected by the power failure detection means. Control means for calculating a power outage duration from the current time measured by the time measuring means and the power outage occurrence time stored in the power outage occurrence time storage means,
An watt-hour meter comprising: notifying means for notifying the power outage duration calculated by the control means. A power failure detection means for detecting a power failure of the external power supply;
A time measuring means for measuring the current time and generating a periodic signal at regular time intervals;
When a power failure is detected by the power failure detection means, a power failure occurrence time storage means for storing the time measured by the timing means as a power failure occurrence time;
The operation is stopped when a power failure is detected by the power failure detection means, and the operation is started when a periodic signal generated by the timing means is input and when a power failure recovery is detected by the power failure detection means. Control means for calculating a power outage duration from the current time measured by the time measuring means and the power outage occurrence time stored in the power outage occurrence time storage means,
By adding the power outage duration calculated by the control means to the cumulative power outage time which is the cumulative time of the power outage that has occurred up to the previous time, and storing it as a new accumulated power outage time and the accumulated power outage time storage means An watt-hour meter comprising: an informing means for informing the stored cumulative power outage time. A backup power supply that supplies power when a power failure is detected by the power failure detection means, and when the cumulative power failure time stored in the cumulative power failure time storage means exceeds a first set value, The watt-hour meter according to claim 2, further comprising an informing means for warning that the remaining amount is low. The time keeping operation stop means for stopping the time measuring operation of the time measuring means when the accumulated power failure time stored in the cumulative power failure time storage means exceeds a second set value is provided. Watt hour meter. The watt-hour meter according to claim 1, wherein the notification unit is at least one of a display unit and a communication unit.

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