JP2011080891A - Watthour meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watthour meter which can notify the outside information relating to deterioration of the watthour meter. <P>SOLUTION: This watthour meter includes a power detection means for detecting a used power of a consumer, a voltage detection means 105 for detecting a used voltage of the user or a current detection means 104 for detecting a used current of the user, and a determination means for determining whether the used voltage or current of the consumer exceeds a predetermined threshold value. In a case where it is determined that the used voltage or current of the consumer exceeds the predetermined threshold value, the outside is notified of a warning indicating that the used voltage or current is excessive, a value of the excessive voltage or current and the number of times of detection of the excessive voltage or current. <P>COPYRIGHT: (C)2011,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 used amount detecting means for measuring the used electric energy of the system to be measured, a control unit for editing data detected by the used amount detecting means into a measured value, and a measured value edited by the control unit. The display part which comprises. (For example, Patent Document 1)

JP 2004-226094 A (page 10, FIG. 2)

Generally, a watt-hour meter is edited by a usage detector for measuring the amount of power used in the system under measurement, a controller for editing the usage measured by the usage detector, and a controller. And a display unit for displaying the data. There is a possibility that the watt-hour meter deteriorates when an overvoltage / overcurrent is applied, and the metering operation is not normally performed. Therefore, a deteriorated watt-hour meter needs to be replaced or repaired. However, it has been difficult to determine the degree of deterioration of the watt hour meter from the appearance.

An object of this invention is to provide the watt-hour meter which can alert | report the information regarding deterioration of a watt-hour meter outside in view of the said problem.

In order to achieve the above object, a watt-hour meter according to the present invention includes a power detection means for detecting power used by a consumer, a voltage detection means for detecting a usage voltage of the consumer, and a demand detected by the detection means. The voltage determination means for determining whether the use voltage of the house exceeds a preset threshold value, and when the use voltage of the consumer is determined to exceed the preset threshold value by the voltage determination means, At least one of an alarm indicating that the voltage is excessive, a use voltage detected by the voltage detection means, and a number of times when the use voltage of the consumer is judged to exceed a preset threshold by the voltage judgment means An informing means for informing the user is provided.

ADVANTAGE OF THE INVENTION According to this invention, the watt-hour meter which can alert | report the information regarding deterioration of a watt-hour meter to the exterior can be provided.

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

  Examples of the present invention will be described below.

Embodiment 1 of an electric energy meter according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the internal structure of a watt-hour meter according to a first embodiment of the present invention. In addition, although a present Example is shown about the single-phase two-wire watt-hour meter, it is applicable similarly to different phase-wire watt-hour meters, such as a single-phase three-wire type and a three-phase three-wire type. .
In FIG. 1, 100 is a watt-hour meter main body.

101A and 101B are terminal portions, and a conductive portion made of a conductive metal such as brass or copper is arranged in a fixed portion made of a highly insulating plastic material such as phenol resin or PBT resin. And connected to an external distribution line. The 1S and 2S terminals of the terminal portion 101A are connected to a power supply side distribution line that receives power from the power supply company, and the 1L and 2L terminals of the terminal portion 101B are connected to a load side distribution line that supplies power into the consumer.

Reference numerals 102 and 103 denote conductive portions, which are made of a conductive metal material such as copper. The conductive portion 102 is between 1S of the terminal portion 101A and 1L of the terminal portion 101B, and the conductive portion 103 is the terminal portion 1.
The electrical connection is made between 2S of 01A and 2L of the terminal portion 101B.

A current detection unit 104 includes a current transformer or the like, and is attached to the conductive unit 102. The current detection unit 104 detects a current (A1) between 1S of the terminal unit 101A and 1L of the terminal unit 101B, and uses the current as a consumer's current. It converts to the corresponding low level electrical signal and outputs it.

A voltage detection unit 105 includes a voltage dividing resistor such as an attenuator, a voltage transformer, and the like. The voltage detection unit 105 detects a voltage (V1) between 1S and 2S of the terminal unit 101A and is at a low level that is directly proportional to the use voltage of the consumer. Converted into an electrical signal and output.

Reference numeral 106 denotes an encoding unit, which includes an analog-digital converter or the like, and includes a current detection unit 1.
A low-level electric signal corresponding to a consumer's current used (A1) between terminals 1S-1L output from 04 is converted from analog to digital, and output as, for example, 16-bit digital data.

Reference numeral 107 denotes an encoding unit, which is composed of an analog-digital converter or the like, and includes a voltage detection unit 1
A low-level electric signal directly proportional to the customer's working voltage (V1) between terminals 1S-2S output from 05 is converted from analog to digital and output as, for example, 16-bit digital data.

A multiplication unit 108 includes a digital multiplication circuit, a DSP (digital signal processor), and the like. The digital data related to the current (A1) output from the encoding unit 106 and the output from the encoding unit 107 are shown. The digital data related to the voltage (V1) is multiplied and converted into digital data related to the active power used by the consumer and output.

A timer unit 120 includes a counting circuit having a crystal oscillation circuit, and counts time.

A storage unit 121 includes a semiconductor memory such as a RAM, and a control unit 1 described later.
The data designated by 24 is stored.

A display unit 122 includes a liquid crystal display and the like, and displays data instructed by the control unit 124 described later.

A communication unit 123 includes a radio wave transmission / reception circuit, an interface circuit such as a current loop, and the like, and performs data communication under the control of the control unit 124 described later.

A control unit 124 is constituted by a microcomputer or the like, calculates digital data relating to the consumer's usable active power output from the multiplication unit 108, calculates the consumer's usable active power, and further uses the active power consumption. The active power usage data is edited as data, stored in the storage unit 121, displayed on the display unit 122, and each unit is controlled to communicate with an external device (not shown in the drawing) via the communication unit 123. Here, the active power usage data refers to data related to the active power used by consumers, such as the total integrated active power amount of the system to be measured and the time zone active power amount for each time zone. The time zone active power amount for each time zone is created based on the time data from the timer unit 120.

Furthermore, the control unit 124 determines whether the digital data output from the encoding unit 106 corresponding to the consumer use current (A1) detected by the current detection unit 104 is greater than or equal to a preset current threshold value. If the digital data is equal to or greater than the current threshold, it is determined that the consumer's use current (A1) is excessive, the current value of the current greater than the current threshold, the date and time of occurrence, and the cumulative occurrence The number of times is stored in the storage unit 121, displayed on the display unit 122, and each unit is controlled to communicate with an external device (not shown) via the communication unit 123. The above-described current threshold value is set via the communication unit 123 from an external device (not shown) such as a handy terminal when the watt-hour meter main body 100 is attached to a consumer.

The control unit 124 compares the digital data output from the encoding unit 107 corresponding to the use voltage (V1) of the consumer detected by the voltage detection unit 105 with a voltage threshold value set in advance or higher. If the digital data is greater than or equal to the voltage threshold, it is determined that the customer's use voltage (V1) is excessive, the voltage value of the voltage greater than or equal to the voltage threshold, the date and time of occurrence, and the cumulative number of occurrences Is stored in the storage unit 121, displayed on the display unit 122, and the communication unit 12.
Each unit is controlled to communicate with an external device (not shown) via 3. The voltage threshold mentioned above is
When the watt-hour meter main body 100 is attached to a consumer, an external device such as a handy terminal (
(Not shown in the figure) is set via the communication unit 123.

Next, the operation of this embodiment will be described with reference to FIG.

The current detection unit 104 detects a current (A1) between 1S of the terminal unit 101A and 1L of the terminal unit 101B, converts the current (A1) into a low-level electric signal corresponding to the consumer's use current (A1), and outputs it.

The voltage detection unit 105 detects the voltage (V1) appearing between the 1S and 2S terminals of the terminal unit 101A, converts the voltage (V1) into a low-level electric signal that is directly proportional to the use voltage of the consumer, and outputs it.

The encoding unit 106 performs analog-to-digital conversion on a low-level electric signal corresponding to the consumer's current used (A1) output from the current detection unit 104, and outputs the converted signal as, for example, 16-bit digital data.

The encoding unit 107 performs analog-to-digital conversion on a low-level electric signal that is directly proportional to the customer's use voltage (V1) output from the voltage detection unit 105, and outputs it as, for example, 16-bit digital data.

The multiplication unit 108 includes digital data corresponding to the consumer usage current (A1) output from the encoding unit 106, and digital data corresponding to the consumer usage voltage (V1) output from the encoding unit 107. And output to the control unit 124 as digital data relating to the available active power of the consumer.

The timer unit 120 has a perpetual calendar, and outputs date and time data and a signal indicating a certain time such as every 1 second to the control unit 124.

The control unit 124 calculates an active power by obtaining an average value for one second of the signal output from the multiplication unit 108 based on the signal output from the timer unit 120 at intervals of 1 second or the like.

The control unit 124 controls each unit to edit, store, and display active power usage data based on the calculated active power. Here, the active power usage data refers to data relating to the active power used by the consumer, such as the total integrated active power of the system to be measured and the time zone active power for each time zone.

The time period active power amount is determined based on the date / time data output from the timer unit 120.
24.

The control unit 124 compares the digital data output from the encoding unit 106 corresponding to the consumer use current (A1) detected by the current detection unit 104 with a preset current threshold value or more. If the digital data is greater than or equal to the current threshold, it is determined that the consumer's current used (A1) is excessive, the current value of the current greater than the current threshold, the date and time of occurrence, and the overcurrent accumulation The number of occurrences is stored in the storage unit 121, displayed on the display unit 122, and each unit is controlled to communicate with an external device (not shown) via the communication unit 123. The accumulated number of overcurrents is output from the encoding unit 106 corresponding to the consumer's current used (A1) detected by the current detection unit 104 after the watt-hour meter main body 100 is installed in the consumer. It means the number of times that the digital data is equal to or greater than a preset current threshold, that is, the total number of times that an excessive current is applied to the watt-hour meter main body 100.

The control unit 124 compares the digital data output from the encoding unit 107 corresponding to the use voltage (V1) of the consumer detected by the voltage detection unit 105 with a voltage threshold value set in advance or higher. If the digital data is equal to or higher than the voltage threshold, it is determined that the customer's use voltage (V1) is excessive, the voltage value of the voltage equal to or higher than the voltage threshold, the date and time of occurrence, and the overvoltage cumulative occurrence The number of times is stored in the storage unit 121, displayed on the display unit 122, and each unit is controlled to communicate with an external device (not shown) via the communication unit 123. The cumulative number of overvoltage occurrences is the digital output from the encoding unit 107 corresponding to the consumer use voltage (V1) detected by the voltage detection unit 105 after the watt-hour meter main body 100 is installed in the consumer. It means the number of times that the data is equal to or higher than a preset voltage threshold, that is, the total number of times that the overvoltage is applied to the watt-hour meter main body 100.

Encoding unit 106 corresponding to the consumer's current used (A1) detected by current detection unit 104
Is output from the encoding unit 107 corresponding to the use voltage (V1) of the consumer detected by the voltage detection unit 105, when the digital data output from the current value is equal to or greater than a preset current threshold value When the digital data is greater than or equal to a preset voltage threshold, the control unit 124
Performs a self-diagnosis of whether each part in the watt-hour meter main body 100 is normal or abnormal. Power meter body 10
0 When it is determined that each part in the interior is abnormal, a code indicating the failure location is stored in the storage unit 12.
1, displayed on the display unit 122, and transmitted to an external device (not shown) via the communication unit 123. Specifically, the self-diagnosis performed by the control unit 124 is confirmation of storage contents of the storage unit 121, confirmation of power supply voltage, and the like.

According to the present embodiment, it is possible to provide a watt hour meter capable of notifying the outside of information related to deterioration of the watt hour meter.

If this embodiment is used, the information relating to the overcurrent and overvoltage applied to the watt hour meter main body 100 is notified by display / communication or the like, so that the deterioration of the watt hour meter main body 100 can be easily predicted. The main body 100 can be replaced at an appropriate time. In addition, since information related to overcurrent and overvoltage applied to the watt-hour meter main body 100 is stored in the storage unit 121, when an indoor home appliance or wiring is damaged due to overvoltage or overcurrent, the cause is investigated. Can be useful.

As described above, by using the present invention, it is possible to provide a watt-hour meter capable of notifying information regarding deterioration of the watt-hour meter to the outside.

100 watt-hour meter main body 101A, 101B terminal unit 102 conductive unit 103 conductive unit 104 current detection unit 105 voltage detection unit 106 encoding unit 107 encoding unit 108 multiplication unit 120 timer unit 121 storage unit 122 display unit 123 communication unit 124 control unit

Claims (5)

A power detection means for detecting power used by a consumer;
Voltage detection means for detecting the working voltage of the consumer;
Voltage determination means for determining whether the use voltage of the consumer detected by the detection means exceeds a preset threshold;
When it is determined by the voltage determination means that the usage voltage of the consumer has exceeded the threshold,
An alarm indicating that the use voltage is excessive, at least one of the use voltage detected by the voltage detection means, and the number of times that the use voltage of the consumer is judged to exceed the threshold by the voltage judgment means is notified. An watt-hour meter comprising an informing means for performing the operation. Timer means for measuring the date and time when the voltage used by the consumer is determined to have exceeded the threshold by the voltage judging means;
The watt-hour meter according to claim 1, further comprising a notifying means for notifying a time counted by the timer means. A power detection means for detecting power used by a consumer;
Current detection means for detecting the current used by the consumer;
Current judgment means for judging whether the current used by the customer detected by the detection means exceeds a preset threshold;
When it is determined by the current determination means that the current used by the consumer has exceeded the threshold,
Notification of at least one of an alarm indicating that the use current is excessive, a use current detected by the current detection means, and the number of times the use current of the consumer is determined to exceed the threshold by the current determination means. An watt-hour meter comprising an informing means for performing the operation. Timer means for measuring the date and time when the current determining means determines that the current used by the consumer has exceeded the threshold;
The watt-hour meter according to claim 3, further comprising a notifying means for notifying a time counted by the timer means. The watt-hour meter according to any one of claims 1 to 4, wherein the notifying unit is at least one of a display unit and a communication unit.

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