JP2001091547A - Watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide watt-hour meter which doesn't depend on the individual clock functions of time switches and the watt-hour meter and eliminates the need for time adjustment by going to the locations of installation of individual time switche and watt-hour meter regularly or in an area during a long-time interruption of the service. SOLUTION: A transformer secondary wire for an instrument to connect a transformer for a low-tension line, or a high-tension or extra-high-tension instrument to a measuring device is used as an electric-field component antenna for long-wave JJY radio waves and a metal propagation/transmission line, and a coupled circuit 1-1 is provided for one line of a voltage circuit. Then a reference clock signal is generated by a waveform shaping circuit 1-4 to shape the waveform of a power frequency voltage into square waves, and long-wave JJY reception information is demodulated by a demodulating circuit 1-3. On the basis of the modulated reception information on time, minute, year, total day, and day of the week, the time, time zone, specific day, specific period of the day, specific day of the week, and specific period of the day of the week are specified to open and close a time-zone-by-time-zone watt-hour meter, season-by-season time-zone-by-time-zone watt-hour meter, a watt demand meter for measuring maximum power demand for 30 minutes, etc., and to perform measurements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an hourly watt hour meter, a seasonal hourly watt hour meter, and a maximum demand watt hour meter for measuring the maximum demand power for 30 minutes. The present invention relates to a watt hour meter that specifies, opens, closes, and measures a specific day period, a specific day of the week, and a specific day of the week.

[0002]

2. Description of the Related Art Conventionally, the measurement of the electric energy of the switching function is performed by combining a time switch driven by a synchronous motor or a time switch equipped with a quartz clock and a watt-hour meter, and performing the switching of the load and the measurement at the time of energization. The maximum demand power meter measures the maximum demand power for a 30-minute period using a quartz clock built into the power meter. The mechanical maximum demand power meter measures the maximum demand power for a 30-minute period by driving a synchronous motor. In the hourly watt hour meter, a wristwatch built in the watt hour meter measures the amount of power by hour. In the hourly watt-hour watt-hour meter, the amount of power is measured for each time zone according to the season using a quartz clock and calendar built into the watt-hour meter. These quartz watches and synchronous motor drives use a battery that drives the quartz watch even during a power failure as a backup during a power outage, and a balance watch that stores energy in a mainspring is used for the synchronous motor drive. In addition, radio wave clocks receiving long-wave JJY use a bar antenna to detect the magnetic field component of radio waves.

[0003]

In the conventional opening / closing and weighing by time zone, weighing by time zone, and weighing by seasonal time, the daily difference of the quartz clock accumulates during use.
In the synchronous motor drive, the date difference of the balance clock during the power failure accumulates during the power failure time. Both the quartz clock and the synchronous motor drive have accumulated deviations from the true time and are not in agreement with the time of the power use contract. Further, when the power supply is stopped for a long time, the balance of the balance clock is released, the backup battery of the quartz clock is discharged, and the clock function is stopped. For this reason, conventionally, there has been a problem that the time has to be adjusted to go out to the mounting position of each time switch and the watt hour meter in the power outage area regularly or for a long time.
In the case of long-wave JJY radio waves, the reception of magnetic field components was unstable in basements and in buildings with reinforced structures.

[0004] The present invention does not rely on the individual clock function of the time switch and the watt hour meter, but adjusts the time to go to the mounting position of each time switch and the watt hour meter in the area periodically and during a long-time power outage. In order to provide an unnecessary watt-hour meter, the time, year, and total date of each watt-hour meter are determined by the received BCD value information of the long wave JJY, and the day of the week is determined by the received 3-bit value information of the long wave JJY. is there. Also, the present invention captures a long-wave JJY radio wave with an electric field component by a low-voltage distribution line placed outdoors or a predetermined transformer secondary wiring for an instrument, and connects the low-voltage distribution line or the secondary wiring to a transmission path of the captured electromagnetic wave. By doing so, the long wave JJY can be measured with the watt hour meter in the building even in the metal instrument box.
It aims at stable reception of radio waves.

[0005]

In order to achieve the above object, in the watt-hour meter of the present invention, an electric field component of a long-wave JJY wave is measured by using a low-voltage distribution line or a high-voltage or extra-high-voltage instrument transformer. The waveform of the commercial frequency voltage of the voltage circuit of the low-voltage distribution line or the instrument transformer was captured by the instrument transformer secondary wiring connecting the device, received from the low-voltage distribution line or the secondary wiring via a coupling circuit, and then received. Using a square wave as a reference clock signal, the operation is performed by obtaining hour information, minute information, year information, total day information, and day information of the long wave JJY. The watt-hour meter may be any of a watt-hour meter with an opening / closing function, a watt-hour watt-hour meter, a seasonal watt-hour watt hour meter, and a day-of-week time watt-hour watt hour meter. Further, the present invention can be applied to a wattmeter instead of a watthour meter.

[0006] The wavelength of the long wave JJY is 7500 m, and the secondary wiring of the instrument transformer for connecting the measuring transformer with the low voltage distribution line or the high voltage or extra high voltage instrument itself is effective as a finite-length electric field component receiving antenna. The wiring itself is effective as a transmission line for metal propagation to the long-wave JJY receiver of the wattmeter.

[0007] Since the watt hour meter does not function during a power outage, the present invention re-establishes the time information, minute information,
It is sufficient to receive year information, total day information, and day of the week information. To determine the BCD value of the hour and minute information and the 3-bit value of the day of the week,
A square wave obtained by shaping the commercial frequency voltage after power recovery is used as a reference clock signal, and the watt hour meter itself can be configured without an internal clock. In addition, since the watt-hour meter itself does not have a clock mechanism, a backup battery for a balance clock and a quartz clock, which are necessary at the time of a power failure, is not required, which is effective. It is also effective because of the high stability of the commercial frequency.

The present invention uses a square wave obtained by shaping a commercial frequency voltage when a watt hour meter is energized as a reference clock signal,
The hourly, hourly, seasonal hourly watt hour meter, and hourly hourly watt hour meter
Such as a maximum demand power meter that measures the maximum demand power for 30 minutes,
Time, time zone, specific day, specific day period, and specific day of the week,
A watt hour meter that specifies, opens, closes, and measures a specific day of the week can be configured, and is effective because of the high stability of the commercial frequency.

[0009] The watt-hour meter constructed as described above comprises a low-voltage distribution line or a high-voltage or extra-high-voltage meter transformer and a meter transformer secondary wiring for connecting the meter transformer with an electric field component antenna and a metal propagation path. To receive the long wave JJY 40kHz radio wave,
The square wave obtained by shaping the commercial frequency voltage is used as a reference clock signal (10 mS for a 50 Hz system, 8.33 mS for a 60 Hz system), and the time information, minute information, year information, and date information of the long wave JJY are received by the receiving device of the watt hour meter itself. , Demodulates the day information.

[0010] When the watt hour meter is energized, a function of the watt hour meter such as opening / closing and weighing switching is operated by judging whether the demodulated information of the long wave JJY and the set value set in the watt hour meter itself are large or small.

At the time of a power failure of the commercial frequency power supply, the load itself does not consume power, so that the watt hour meter does not measure and does not require functions and operations such as opening and closing and switching of measurement. Therefore, the hour information, minute information, year information,
There is no need to demodulate the total day information and the day of the week information, and there is no problem even if the receiving device of the watt hour meter itself stops.

[0012] After the power supply of the commercial frequency power supply is restored, the measuring and receiving device of the watt hour meter is started, and the hour information, minute information, year information, total day information, and day of the week information of the long wave JJY are demodulated again, and the watt hour meter is measured. The functions such as opening / closing and measurement switching are restored.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show first to third embodiments of the present invention. As shown in FIG. 1, FIG. 2, and FIG. 3, a coupling circuit 1-1 is provided on one line of the voltage circuit so as to have a low impedance at a frequency of 40 kHz of the long wave JJY and a high impedance at a commercial frequency of 50 Hz and 60 Hz. On the other hand, long-wave JJY radio waves are captured and propagated by the low-voltage distribution line or the secondary wiring of the meter transformer that connects the meter transformer with the high-voltage or extra-high-voltage meter transformer. From the long wave JJY radio wave, the long wave JJY receiving circuit 1-2 is used for the marker and position marker 200m.
S, 800 ms of binary 0 and 500 ms of binary 1 are received.
The waveform shaping circuit 1-4 shapes the waveform of the commercial frequency voltage of the voltage circuit into a square wave and uses it as a reference clock signal. Demodulation circuit for year, total day, hour, minute, and day of the week based on a reference clock signal with a duty of 50% for a 50 Hz commercial frequency system and a reference clock signal with a 50% duty of 8.33 ms for a commercial frequency 60 Hz system.
Demodulate in 1-3.

In the watt hour meter with an opening / closing function shown in FIG. 1, the judgment of the setting contents of the opening / closing setting circuit 3-1 and the demodulation information is made by an opening / closing judgment circuit 3-2. The switching command activates the switching drive circuit 4-1 to open and close the main switch 4-2. In FIG. 1, the voltage and current are detected by the voltage detection circuit 2-1 and the current detection circuit 2-2, the power amount during energization is calculated by the multiplication circuit 2-3, and the power amount during the switch-on period is calculated. Display on display circuit 2-4.

In the hourly watt hour meter or seasonal hourly watt hour meter of FIG. 2, the display circuit 2-4 displays the hourly hourly watt hour meter and the seasonal hourly watt hour meter by hour zone. Display each weighing value of. The setting of the weighing time zone setting circuit 3-3 and the demodulation information are judged by the weighing time zone judgment circuit 3-4.
Switch the display circuit 2-4. In FIG. 2, the voltage and current are detected by the voltage detection circuit 2-1 and the current detection circuit 2-2, and the power amount during energization is calculated by the multiplication circuit 2-3. Is displayed on the display circuit 2-4.

In the maximum demand power meter of FIG. 3, the determination of the 0-minute and 30-minute set values of the demand time setting circuit 3-5 and the demodulated information is made by the demand time determination circuit 3-6. The demand time judgment circuit
Based on the time reset signal at 30-minute intervals determined in 3-6, the pulse integration circuit 5-1 integrates the transmitted pulses of the watt hour meter. The 30-minute demand value is calculated by the pulse integrating circuit 5-1 and the value, that is, the maximum demand power for 30 minutes is displayed on the maximum value display circuit 5-2. When the demand value exceeds the previous value in the next 30 minutes, the value of the maximum value display circuit 5-2 is updated and the value is displayed. In FIG. 3, at the end of the maximum demand power measurement period, that is, after the meter reading, resetting is performed by the zero return circuit 5-3, and the value of the maximum value display circuit 5-2 is artificially returned to zero.

[0017]

Since the present invention is configured as described above, it has the following effects.

A long-wave JJY radio wave is captured with an electric field component using a low-voltage distribution line or a predetermined secondary transformer of an instrument, and the low-voltage distribution line or the secondary wiring of the transformer is used as a metal transmission line of the captured electromagnetic wave. Long waves in metal instrument boxes and buildings
Stable reception of JJY radio waves.

By using a square wave obtained by shaping the commercial frequency voltage of the voltage circuit of the low-voltage distribution line or the voltage transformer for the instrument as a reference clock signal, a clock pulse transmission circuit necessary for the demodulation circuit of the long-wave JJY information can be omitted.

[0020] The hour, minute, and
Based on the received demodulation information for the year, the total day, and the day of the week, the time, time zone, and specific date, such as hourly hourly energy meter, seasonal hourly energy meter, and maximum demand electricity meter that measures the maximum demand for 30 minutes, etc. , Specific day period, specific day of the week, specific day of the week period
The watt-hour meter can be configured without an internal clock itself.

Since the time information and minute information of the long wave JJY are used,
There is no need to correct the time lag during long-term use due to the accuracy present in the conventional timepiece and quartz timepiece during a power failure.

After the commercial frequency power supply is restored, the meter and receiver of the watt hour meter are activated, and the hour information, minute information, year information, total day information, and day of week information of the long wave JJY are demodulated again, and the watt hour meter is measured. Since the functions such as opening / closing and metering switching are activated, and the watt-hour meter itself does not have a clock mechanism, the backup battery for the balance clock and quartz clock, which were required conventionally during a power outage, is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a watt hour meter with a switch function according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an hourly watt hour meter or a seasonal hourly watt hour meter according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a maximum demand power meter according to a third embodiment of the present invention.

[Explanation of symbols]

1-1 Coupling circuit 1-2 Longwave JJY receiving circuit 1-3 Demodulation circuit 1-4 Waveform shaping circuit 2-0 Watt hour meter connection terminal 2-1 Voltage detection circuit 2-2 Current detection circuit 2-3 Multiplication circuit 2- 4 Display circuit 2-5 Power supply terminal of maximum demand power meter (transformer secondary voltage) 2-6 Measurement pulse input terminal of maximum demand power meter 3-1 Open / close setting circuit 3-2 Open / close determination circuit 3-3 Weighing Time zone setting circuit 3-4 Weighing time zone judgment circuit 3-5 Demand time setting circuit 3-6 Demand time judgment circuit 4-1 Switching drive circuit 4-2 Main switch 5-1 Pulse integration circuit 5-2 Maximum value display Circuit 5-3 Reset circuit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiaki Morohashi 34-1 Ishigamizawa, Yoshioka, Yamato-cho, Kurokawa-gun, Miyagi Prefecture F-term in Tohoku Keiki Kogyo Co., Ltd. 5K048 BA21 EB05 EB10 EB11 GB06

Claims (5)

[Claims] Claims 1. A long-wave JJY electromagnetic wave is captured by a low-voltage distribution line or a secondary wiring of a high-voltage or extra-high-voltage instrument transformer and a meter transformer, and the low-voltage distribution line or the secondary wiring A watt-hour meter having a long-wave JJY receiver, wherein a long-wave JJY electromagnetic wave is received via a coupling circuit provided on one line. 2. A square wave obtained by shaping the commercial frequency voltage of a voltage circuit of a low-voltage distribution line or a transformer for an instrument, a long wave JJY electromagnetic wave marker, a position marker, a binary 0 pulse, and a binary 1 pulse. 2. The watt hour meter having a long-wave JJY receiver according to claim 1, wherein the wrist-hour is a reference clock signal to be determined. 3. The BCD value of the hour information and minute information of the long wave JJY is compared with the hour and minute of a plurality of operation settings, and the BCD value of the hour information and the minute information of the long wave JJY is compared.
3. The watt hour meter having a long-wave JJY receiver according to claim 1, further comprising an hour / minute timer function based on a judgment criterion that the CD value is equal to or greater than the hour / minute of the operation setting. [4] The BCD value of the year information of the long wave JJY and the total date information are compared with the set multiple years and the total day, and the year in which the BCD value of the year information of the long wave JJY and the total date information are set and the total number are calculated. 4. The watt hour meter having a long-wave JJY receiving device according to claim 1, wherein the watt hour meter has a function of determining a specific day and a specific day period based on a criterion of being equal to a day. 5. The three-bit value of the day information of the long wave JJY is compared with the set three-bit value of the day of the week, and the determination criterion is that the three bit value of the day information of the long wave JJY is equal to the set three-bit value of the day of the week. 5. The watt hour meter having a long-wave JJY receiving device according to claim 1, wherein the watt hour determining function is provided.