【０００１】[0001]
【産業上の利用分野】本発明は電力供給線の電力に比例
した信号をアナログ−ディジタル変換して得られるディ
ジタル信号に基づいて当該電力供給線上の負荷電力を求
める電子式電力量計に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic watt-hour meter for determining load power on a power supply line based on a digital signal obtained by analog-digital conversion of a signal proportional to the power of the power supply line. is there.
【０００２】[0002]
【従来の技術】電子機器の発展に伴い、近年では、電力
量計分野においても、ディジタルで測定を行う電子式電
力量計が、従来の誘導形電力量計に取って変わろうとし
ている。2. Description of the Related Art With the development of electronic equipment, in the field of watt-hour meters, electronic watt-hour meters that measure digitally are about to replace conventional inductive watt-hour meters in recent years.
【０００３】この電子式電力量計は、電力供給線上の電
圧及び電流に比例した電圧信号及び電流信号をディジタ
ル信号に変換し、両者を乗算変換して電力データを得、
この電力データを積算することで電力量を算出するよう
になっているもので、半導体デバイスの発展がめざまし
い今、時代に相応しい動作形式をとっており、デバイス
の能力向上に伴って性能アップの可能性を秘めている。This electronic watt-hour meter converts a voltage signal and a current signal proportional to a voltage and a current on a power supply line into a digital signal and multiplies and converts them to obtain power data.
The amount of power is calculated by accumulating this power data, and now that the development of semiconductor devices is remarkable, it is operating in a form suitable for the times, and it is possible to improve the performance as the capabilities of the device improve. Has sex.
【０００４】なお、負荷電圧の瞬時値及び実効値をそれ
ぞれｅR 及びＶR で表し、負荷電流の瞬時値及び実効値
をそれぞれｉR 及びＩR で表し、負荷電流ｉR が負荷電
圧ｅR よりも位相角θだけ遅れているものとすると、 ｅR ＝２(1/2)ＶR sin ωｔ （１） ｉR ＝２(1/2)ＩR sin （ωｔ−θ） （２） であり、瞬時電力ｐR は、 ｐR ＝ＶR ＩR （cos θ−cos （２ωｔ−θ）） （３） で表される（但し、ωは角周波数、ｔは時間を表す）。The instantaneous value and the effective value of the load voltage are represented by eR and VR, respectively, and the instantaneous value and the effective value of the load current are represented by iR and IR, respectively, and the load current iR is smaller than the load voltage eR by the phase angle θ. If it is delayed, eR = 2(1/2) VR sin ωt (1) iR = 2(1/2) IR sin (ωt-θ) (2), and the instantaneous power pR is pR = VR IR (cos θ−cos (2ωt−θ)) (3) (where ω is the angular frequency and t is the time).
【０００５】[0005]
【発明が解決しようとする課題】ところで、従来、電力
の供給は電力会社から需要家への方向（以下、正方向と
いう。）であったが、近年、海外では、需要家で自家発
電した電力を電力会社へ販売する、という逆方向の供給
形態が現れている。我が国でも遠からず実施される見通
しであり、実施には正逆両方向の需給形態に対応できる
電力量計が必要であるが、現在の電力量計は、自家発電
電力を電力会社へ供給する方向の電力量を測定する能力
は備えていないのが実情である。By the way, conventionally, the supply of electric power has been in the direction from the electric power company to the customer (hereinafter referred to as the positive direction), but in recent years overseas, the electric power generated by the customer himself / herself. Is being supplied to the electric power company in the opposite direction. It is expected that it will be implemented in Japan soon, and implementation requires a watt-hour meter that can handle both the forward and reverse directions of supply and demand.However, current watt-hour meters are designed to supply self-generated power to electric power companies. In reality, it does not have the ability to measure electric energy.
【０００６】今後、上記したような電子式電力量計にも
そのような能力が要求されるのは間違いない。There is no doubt that the electronic watt hour meter as described above will be required to have such capability.
【０００７】なお、電力は、正逆両方向共、同一の電力
供給線を通して需給が行われるため、正逆両方向に対応
できる電力量計を作るにあたっては、電力の需給方向識
別能力が不可欠である。[0007] Incidentally, since electric power is supplied and demanded through the same electric power supply line in both the forward and reverse directions, the ability to identify the supply and demand direction of the electric power is indispensable in making a watt-hour meter capable of handling both the forward and reverse directions.
【０００８】本発明はこのような課題を解決し、電力の
正逆両方向の需給形態に対応可能な電子式電力量計を提
供することを目的とする。An object of the present invention is to solve such problems and to provide an electronic watt-hour meter capable of coping with the supply and demand of electricity in both forward and reverse directions.
【０００９】[0009]
【課題を解決するための手段】請求項１記載の本発明の
電子式電力量計は、電力給電線上の電力に比例した電力
データを生成する電力データ生成手段と、上記電力デー
タの示す値を積分し、かつその結果を上記電力給電線上
の電力受給方向の電力として求め、その値を出力する第
１の積分手段と、上記電力データの示す値を積分し、か
つその結果を上記電力給電線上の電力受給方向とは逆方
向の電力として求め、その値を出力する第２の積分手段
と、上記電力データを上記第１、第２の積分手段のいず
れか一方へ選択的に与える信号伝送路切換え手段と、上
記電力給電線上を流れる信号の半周期の整数倍に相当す
る設定時間だけ上記電力データを積分する第３の積分手
段と、この第３の積分手段の出力値の符号に基づいて上
記電力給電線上の電力が上記電力受給方向及びその逆方
向のいずれであるかを判定し、その結果に従って上記信
号伝送路切換え手段を切換え制御する判別手段とを備え
ている。According to another aspect of the present invention, there is provided an electronic watt-hour meter of the present invention, in which electric power data generating means for generating electric power data proportional to electric power on an electric power feeding line and a value indicated by the electric power data. A first integrating means that integrates and obtains the result as electric power in the electric power receiving direction on the electric power feeding line, outputs the value, and integrates the value indicated by the electric power data, and outputs the result on the electric power feeding line. Of the electric power in the opposite direction to the electric power receiving direction, and outputs the value of the electric power, and a signal transmission path for selectively supplying the electric power data to one of the first and second integrating means. Based on the switching means, the third integrating means for integrating the power data for a set time corresponding to an integral multiple of a half cycle of the signal flowing on the power feeding line, and the sign of the output value of the third integrating means. On the above power supply line Force and a determination means to determine which of the power receiving direction and the opposite direction, for controlling switching of the signal transmission path switching means according to the result.
【００１０】また、請求項２記載の本発明の電子式電力
量計は、電力給電線上の電力に比例した電力データを生
成する電力データ生成手段と、上記電力データの示す値
を積分し、かつその結果を上記電力給電線上の電力受給
方向の電力として求め、その値を出力する第１の積分手
段と、上記電力データの示す値を積分し、かつその結果
を上記電力給電線上の電力受給方向とは逆方向の電力と
して求め、その値を出力する第２の積分手段と、上記電
力データを上記第１、第２の積分手段のいずれか一方へ
選択的に与える信号伝送路切換え手段と、上記電力デー
タの符号を判別する符号判別手段と、この符号判別手段
の判別結果に基づいて上記電力データが±各符号状態に
ある時間を測定し、この±符号の設定時間内での時間占
有比に基づいて上記電力データの方向を判別する判別手
段とを備えている。The electronic watt-hour meter of the present invention according to claim 2 is a power data generating means for generating power data proportional to the power on the power feed line, and integrates the value indicated by the power data, and The result is obtained as the electric power in the electric power receiving direction on the electric power feeding line, the first integrating means for outputting the value and the value indicated by the electric power data are integrated, and the result is the electric power receiving direction on the electric power feeding line. Second integration means for obtaining the electric power in the opposite direction to and outputting the value, and signal transmission path switching means for selectively applying the electric power data to either one of the first and second integration means, A code discriminating means for discriminating the sign of the electric power data, and the time during which the electric power data is in each code state is measured based on the discrimination result of the code discriminating means, and the time occupancy ratio within the set time of the ± code is measured. Based on above And a determination unit that determines the direction of the power data.
【００１１】[0011]
【作用】請求項１記載の本発明は、電力給電線上を流れ
る信号が正方向のときの電力データを半周期の整数倍に
相当する設定時間（例えば、半周期）だけ積分すれば、
その積分値の符号は“＋”になり、電力給電線上を流れ
る信号が逆方向のときの電力データを同時間だけ積分す
れば、その積分値の符号は“−”になることを利用し、
当該積分値の符号を見ることで電力の需給方向を判別
し、その判別結果に従って正逆各方向に対応する積分手
段へ電力データを切換え供給するようになっているた
め、電力の正逆両方向の需給形態に対応可能となる。According to the first aspect of the present invention, if the power data when the signal flowing on the power feeding line is in the positive direction is integrated for a set time (for example, half cycle) corresponding to an integral multiple of half cycle,
The sign of the integrated value becomes "+", and the sign of the integrated value becomes "-" if the power data when the signal flowing on the power feeding line is in the opposite direction is integrated for the same time.
The power supply / demand direction is determined by looking at the sign of the integrated value, and the power data is switched and supplied to the integrating means corresponding to each of the forward and reverse directions according to the determination result. It becomes possible to correspond to the supply and demand form.
【００１２】また、請求項２記載の本発明は、電力給電
線が例えば単相２線式や単相３線式の場合、電力給電線
上を流れる信号が正方向のときの電力データの符号を半
周期の整数倍に相当する設定時間（例えば、半周期）だ
け監視すればＴ+ （符号が“＋”の時間）＞Ｔ- （符号
が“−”の時間）となり、電力給電線上を流れる信号が
逆方向のときの電力データの符号を半周期の整数倍に相
当する設定時間（例えば、半周期）だけ監視すればＴ-
＞Ｔ+ となることを利用し、時間Ｔ+ ，Ｔ- の占有比に
基づいて電力の需給方向を判別し、その判別結果に従っ
て正逆各方向に対応する積分手段へ電力データを切換え
供給するようになっているため、電力の正逆両方向の需
給形態に対応可能となる。According to the present invention as set forth in claim 2, when the power feeding line is, for example, a single-phase two-wire type or a single-phase three-wire type, the sign of the power data when the signal flowing on the power feeding line is in the forward direction is used. If monitoring is performed for a set time (for example, a half cycle) corresponding to an integral multiple of a half cycle, T + (time when the code is "+")> T- (time when the code is "-") and flows on the power supply line. If the sign of the power data when the signal is in the reverse direction is monitored for a set time (for example, half cycle) corresponding to an integral multiple of half cycle, T-
Utilizing the fact that> T +, the supply / demand direction of electric power is discriminated based on the occupancy ratio of the times T + and T-, and electric power data is switched and supplied to the integrating means corresponding to each of the forward and reverse directions according to the discrimination result. As a result, it is possible to cope with both the forward and reverse directions of power supply and demand.
【００１３】[0013]
【実施例】以下に本発明の実施例について図面を参照し
つつ説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１４】図１は本発明の第１実施例に係る単相２線
式電力給電線用電子式電力量計の回路構成を示すもので
ある。FIG. 1 shows a circuit configuration of an electronic watt-hour meter for a single-phase two-wire type power feed line according to a first embodiment of the present invention.
【００１５】この図において、１は変圧器、２はアナロ
グ−ディジタル（以下、ＡＤという。）変換器である。
変圧器１は、一次側が電力供給線に接続され、この電力
供給線の電圧を、後段のＡＤ変換器２で取扱える程度の
値に降圧し、二次側に、電力供給線の電圧に瞬時値及び
実効値が比例する電圧信号を出力するものである。ＡＤ
変換器２は、変圧器１の二次電圧信号の瞬時値をサンプ
リングし、各サンプリング値を示すコードデータを出力
するものである。In this figure, 1 is a transformer, and 2 is an analog-digital (hereinafter referred to as AD) converter.
The primary side of the transformer 1 is connected to the power supply line, and the voltage of the power supply line is stepped down to a value that can be handled by the AD converter 2 in the subsequent stage, and the voltage of the power supply line is instantaneously supplied to the secondary side. It outputs a voltage signal whose value and effective value are proportional. AD
The converter 2 samples the instantaneous value of the secondary voltage signal of the transformer 1 and outputs code data indicating each sampled value.
【００１６】３は変流器、４はＡＤ変換器である。変流
器３は、一次側が電力供給線に接続され、この電力供給
線の電流を、後段のＡＤ変換器４で取扱える程度の値に
小電流に変換し、二次側に、電力供給線の電流に瞬時値
及び実効値が比例する電流信号を出力するものである。
ＡＤ変換器４は、変流器３の二次電流圧信号の瞬時値を
サンプリングし、各サンプリング値を示すコードデータ
を出力する。Reference numeral 3 is a current transformer, and 4 is an AD converter. The current transformer 3 has a primary side connected to a power supply line, converts the current of the power supply line into a small current that can be handled by the AD converter 4 in the subsequent stage, and supplies the power supply line to the secondary side. It outputs a current signal whose instantaneous value and effective value are proportional to the current.
The AD converter 4 samples the instantaneous value of the secondary current pressure signal of the current transformer 3 and outputs code data indicating each sampled value.
【００１７】５は乗算器であり、この乗算器５はＡＤ変
換器２，４の電圧データ及び電流データを掛合わせて電
力データを生成する。Reference numeral 5 denotes a multiplier, which multiplies the voltage data and current data of the AD converters 2 and 4 to generate electric power data.
【００１８】６は信号伝送路切換え部であり、乗算器５
の電力データを正方向用測定系統及び逆方向用測定系統
へ選択的に伝送するものである。Reference numeral 6 denotes a signal transmission path switching unit, which is a multiplier 5
The power data of 1 is selectively transmitted to the forward measurement system and the reverse measurement system.
【００１９】正方向用測定系統は積分器７とパルス発生
器８と表示器９とから構成されている。積分器７は、電
力データを積算し、その積算値が一定値を越えるとパル
ス１個の出力指令を発生し、同時にそのパルス１個分に
相当する電力値を当該積算値から減算する、という動作
を繰返す。パルス発生器８は、この積分器７からのパル
ス出力指令を受ける毎にパルスを発生する。表示器９は
パルス発生器８からの出力パルスを受けるごとに、パル
ス１個あたりの電力を積算し、その積算値を表示する。The forward measurement system is composed of an integrator 7, a pulse generator 8 and a display 9. The integrator 7 integrates the power data, generates an output command for one pulse when the integrated value exceeds a certain value, and simultaneously subtracts the power value corresponding to the one pulse from the integrated value. Repeat the operation. The pulse generator 8 generates a pulse each time it receives a pulse output command from the integrator 7. Each time the display device 9 receives an output pulse from the pulse generator 8, the power per pulse is integrated and the integrated value is displayed.
【００２０】逆方向用測定系統は積分器１０とパルス発
生器１１と表示器１２とから構成されている。積分器１
０は、電力データを積算し、その積算値が一定値を越え
るとパルス１個の出力指令を発生し、同時にそのパルス
１個分に相当する電力値を当該積算値から減算する、と
いう動作を繰返す。パルス発生器１１は、この積分器１
０からのパルス出力指令を受ける毎にパルスを発生す
る。表示器１２はパルス発生器１１からの出力パルスを
受けるごとに、パルス１個あたりの電力を積算し、その
積算値を表示する。The backward measurement system is composed of an integrator 10, a pulse generator 11 and a display 12. Integrator 1
0 is an operation of integrating power data, generating an output command for one pulse when the integrated value exceeds a certain value, and at the same time subtracting the power value corresponding to one pulse from the integrated value. Repeat. The pulse generator 11 is the integrator 1
A pulse is generated each time a pulse output command from 0 is received. Each time the display device 12 receives an output pulse from the pulse generator 11, the display device 12 integrates the electric power per pulse and displays the integrated value.
【００２１】１３は積分器、１４は積分時間制御器、１
５は電流方向判別器である。積分器１３は電力給電線上
を流れる信号の半周期の整数倍に相当する設定時間毎に
乗算器５からの電力データを積分するものであり、積分
時間制御器１４はその積分時間を積分器１３に対し指示
するものである。電流方向判別器１５は積分器１３の積
分データの符号に基づいて電力給電線上の電流の方向、
つまり電力の需給方向が正逆いずれであるかを判別し、
その判別結果に従って切換え部６を正逆用いずれかの測
定系統に設定する。これにより、切換え部６はその積分
時間に相当する時間毎に設定し直され、その積分時間単
位で各測定系統での測定が行われる。13 is an integrator, 14 is an integration time controller, 1
Reference numeral 5 is a current direction discriminator. The integrator 13 integrates the power data from the multiplier 5 every set time corresponding to an integral multiple of a half cycle of the signal flowing on the power feed line, and the integration time controller 14 calculates the integration time by the integration time. To instruct. The current direction discriminator 15 determines the direction of the current on the power feed line based on the sign of the integrated data of the integrator 13,
In other words, it is determined whether the power supply and demand direction is normal or reverse,
According to the determination result, the switching unit 6 is set to either the normal or reverse measurement system. As a result, the switching unit 6 is reset every time corresponding to the integration time, and the measurement is performed in each measurement system in the integration time unit.
【００２２】図３は、単相２線式電力給電線上の正逆各
方向の瞬時電圧、瞬時電流、瞬時電力の各信号波形、瞬
時電力の符号波形、積分波形を例示するものである。FIG. 3 exemplifies the signal waveforms of the instantaneous voltage, the instantaneous current, the instantaneous power, the sign waveform of the instantaneous power, and the integral waveform in the forward and reverse directions on the single-phase two-wire type power feed line.
【００２３】Ｔは積分時間であり、例えば、時刻ｔ0 か
ら時刻ｔ1 までの需給方向が正方向、時刻ｔ1 から時刻
ｔ2 までの需給方向が逆方向であったとする。T is an integration time, and it is assumed that the supply and demand direction from time t0 to time t1 is positive and the supply and demand direction from time t1 to time t2 is opposite.
【００２４】すると、時刻ｔ0 から時刻ｔ1 までの瞬時
電力の符号は図３（ｂ）の実線で示すものとなり、時刻
ｔ0 から時刻ｔ3 までの間は瞬時電力の符号が“−”の
ため、図３（ｃ）に示すように、積分器１３による積分
波形の符号は“−”となり、時刻ｔ3 から時刻ｔ1 まで
は瞬時電力の符号が“＋”となるため、積分波形の符号
は時刻ｔ3 において“＋”方向へ折返し、最終的に時刻
ｔ1 において“＋”となる。したがって、この符号
“＋”により電力需給方向が正方向であることが判明す
る。Then, the sign of the instantaneous power from the time t0 to the time t1 is shown by the solid line in FIG. 3B, and the sign of the instantaneous power is "-" from the time t0 to the time t3. As shown in FIG. 3 (c), the sign of the integrated waveform by the integrator 13 is "-", and the sign of the instantaneous power is "+" from time t3 to time t1, so the sign of the integrated waveform is at time t3. It turns back in the "+" direction, and finally becomes "+" at time t1. Therefore, this sign “+” indicates that the power supply and demand direction is the positive direction.
【００２５】同様に、時刻ｔ1 から時刻ｔ2 までの間は
瞬時電力の符号は図３（ｂ）の一点鎖線で示すようなも
のとなり、時刻ｔ1 から時刻ｔ4 までの間は瞬時電力の
符号が“＋”のため、図３（ｃ）に示すように、積分器
１３による積分波形の符号は“＋”となり、時刻ｔ4 か
ら時刻ｔ2 までは瞬時電力の符号が“−”となるため、
積分波形の符号は時刻ｔ4 において“−”方向へ折返
し、最終的に時刻ｔ2 において“−”となる。したがっ
て、この符号“−”により電力需給方向が逆方向である
ことが判明することとなる。Similarly, from time t1 to time t2, the sign of the instantaneous power is as shown by the alternate long and short dash line in FIG. 3 (b), and from time t1 to time t4 the sign of the instantaneous power is " 3 (c), the sign of the waveform integrated by the integrator 13 is "+" and the sign of the instantaneous power is "-" from time t4 to time t2.
The sign of the integrated waveform turns back in the "-" direction at time t4, and finally becomes "-" at time t2. Therefore, the sign "-" indicates that the power supply and demand direction is the opposite direction.
【００２６】本実施例によれば、その判別結果に従って
正逆各方向に対応する測定系統へ電力データを切換え供
給するようになっているため、電力の正逆両方向の需給
形態に対応可能なものとなる。According to the present embodiment, the electric power data is switched and supplied to the measurement system corresponding to each of the forward and reverse directions according to the result of the determination, so that it is possible to correspond to the supply and demand form of the forward and reverse directions of the electric power. Becomes
【００２７】図２は本発明の第２実施例に係る単相２線
式電力給電線用電子式電力量計の回路構成を示すもので
ある。この図に示す電力量計の、図１に示すものと同一
の構成要素については同一符号を付してその説明を省略
し、異なる部分についてのみ説明する。FIG. 2 shows a circuit configuration of an electronic watt-hour meter for a single-phase two-wire power feed line according to a second embodiment of the present invention. The components of the watt hour meter shown in this figure that are the same as those shown in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted, and only the different portions will be explained.
【００２８】この図において、１６は瞬時電力符号判別
器、１７は符号別時間測定器、１８は測定時間制御器、
１９は符号比判別器である。瞬時電力符号判別器１６は
乗算器５からの電力データの符号を判別するものであ
り、図３（ｂ）に示すような符号表示信号を出力する。
符号別時間測定器１７は単位測定時間Ｔにおける±各符
号の占有時間を測定する。測定時間制御器１８はその単
位測定時間Ｔを符号別時間測定器１７に対して指示する
ものである。符号比判別器１９は、符号別時間測定器１
７の測定結果における±各符号の時間占有比から電力の
需給方向が正逆いずれの方向であるかを判別し、その判
別結果に従って切換え部６を設定する。よって、切換え
部６はその測定時間Ｔに相当する時間毎に設定し直さ
れ、その測定時間単位で各測定系統での測定が行われる
こととなる。In this figure, 16 is an instantaneous power code discriminator, 17 is a code time measuring device, 18 is a measurement time controller,
Reference numeral 19 is a code ratio discriminator. The instantaneous power code discriminator 16 discriminates the code of the power data from the multiplier 5, and outputs a code display signal as shown in FIG.
The code-based time measuring device 17 measures ± the occupied time of each code in the unit measurement time T. The measurement time controller 18 indicates the unit measurement time T to the code time measuring device 17. The code ratio discriminator 19 is a time meter for each code 1
Based on the time occupancy ratio of ± each sign in the measurement result of 7, it is determined whether the power supply / demand direction is forward or reverse, and the switching unit 6 is set according to the determination result. Therefore, the switching unit 6 is reset every time corresponding to the measurement time T, and the measurement is performed in each measurement system in the measurement time unit.
【００２９】本実施例によれば、単相２線式電力給電線
上を流れる信号が正方向のときの電力データの符号を半
周期の整数倍に相当する設定時間Ｔだけ監視し、Ｔ+
（符号が“＋”の時間）＞Ｔ- （符号が“−”の時間）
となり、電力給電線上を流れる信号が逆方向のときの電
力データの符号を半周期の整数倍に相当する設定時間
（例えば、半周期）だけ監視すればＴ- ＞Ｔ+ となるこ
とを利用し、時間Ｔ+ ，Ｔ- の占有比に基づいて電力の
需給方向を判別し、その判別結果に従って正逆各方向に
対応する積分手段へ電力データを切換え供給するように
なっているため、電力の正逆両方向の需給形態に対応可
能となっている。According to this embodiment, the sign of the electric power data when the signal flowing on the single-phase two-wire type electric power supply line is in the positive direction is monitored for a set time T corresponding to an integral multiple of a half cycle, and T +
(Time when sign is "+")> T- (Time when sign is "-")
Therefore, if the sign of the power data when the signal flowing on the power supply line is in the opposite direction is monitored for a set time (for example, half cycle) corresponding to an integral multiple of half cycle, then T-> T + is used. , T +, T-, the power supply / demand direction is discriminated based on the occupancy ratio, and the electric power data is switched and supplied to the integrating means corresponding to each of the forward and reverse directions according to the discrimination result. It is possible to support both supply and demand patterns in both forward and reverse directions.
【００３０】なお、上記実施例では電流信号のディジタ
ルデータへの変換を電流モードのまま行っているが、電
圧モードに変換した後に行ってもかまわない。Although the current signal is converted into the digital data in the current mode in the above embodiment, it may be converted into the voltage mode.
【００３１】[0031]
【発明の効果】以上説明したように請求項１記載の本発
明によれば、電力給電線上を流れる信号が正方向のとき
の電力データを半周期の整数倍に相当する設定時間（例
えば、半周期）だけ積分すれば、その積分値の符号は
“＋”になり、電力給電線上を流れる信号が逆方向のと
きの電力データを同時間だけ積分すれば、その積分値の
符号は“−”になることを利用し、当該積分値の符号を
見ることで電力の需給方向を判別し、その判別結果に従
って正逆各方向に対応する積分手段へ電力データを切換
え供給するようになっているため、電力の正逆両方向の
需給形態に対応可能となる。As described above, according to the present invention as set forth in claim 1, the power data when the signal flowing through the power feed line is in the positive direction is set for a set time (for example, a half time) corresponding to an integral multiple of a half cycle. If the integration is performed for the same period, the sign of the integrated value becomes "+", and if the power data when the signal flowing on the power feeding line is in the opposite direction is integrated for the same time, the sign of the integrated value is "-". The power supply direction is determined by observing the sign of the integral value, and the power data is switched and supplied to the integrating means corresponding to each of the forward and reverse directions according to the determination result. Therefore, it becomes possible to cope with the supply and demand pattern of electric power in both directions.
【００３２】また、請求項２記載の本発明によれば、例
えば、単相２線式、単相３線式の電力給電線上を流れる
信号が正方向のときの電力データの符号を半周期の整数
倍に相当する設定時間（例えば、半周期）だけ監視すれ
ばＴ+ （符号が“＋”の時間）＞Ｔ- （符号が“−”の
時間）となり、電力給電線上を流れる信号が逆方向のと
きの電力データの符号を半周期の整数倍に相当する設定
時間（例えば、半周期）だけ監視すればＴ- ＞Ｔ+ とな
ることに着目し、時間Ｔ+ ，Ｔ- の占有比に基づいて電
力の需給方向を判別し、その判別結果に従って正逆各方
向に対応する積分手段へ電力データを切換え供給するよ
うになっているため、電力の正逆両方向の需給形態に対
応可能となる。Further, according to the present invention as set forth in claim 2, for example, the sign of the power data when the signal flowing on the power feeding line of the single-phase two-wire system or the single-phase three-wire system is in the positive direction is a half cycle. If monitored for a set time (for example, a half cycle) corresponding to an integral multiple, T + (time when the code is "+")> T- (time when the code is "-"), and the signal flowing on the power supply line is reversed. When the sign of the power data in the direction is monitored for a set time (for example, half cycle) corresponding to an integral multiple of half cycle, it is noted that T-> T +, and the occupancy ratio of times T + and T- Based on this, the power supply and demand direction is determined, and the power data is switched and supplied to the integrating means corresponding to each of the forward and reverse directions according to the determination result. Become.
【図１】本発明の第１実施例に係る電子式電力量計のブ
ロック図。FIG. 1 is a block diagram of an electronic watthour meter according to a first embodiment of the present invention.
【図２】本発明の第２実施例に係る電子式電力量計のブ
ロック図。FIG. 2 is a block diagram of an electronic watt hour meter according to a second embodiment of the present invention.
【図３】単相２線式電力給電線上の正逆各方向の瞬時電
圧、瞬時電流、瞬時電力の各信号波形、瞬時電力の符号
波形、積分波形を例示する波形図。FIG. 3 is a waveform diagram illustrating an instantaneous voltage, an instantaneous current, a signal waveform of an instantaneous power, a sign waveform of the instantaneous power, and an integral waveform in each of the forward and reverse directions on the single-phase two-wire power feed line.
【符号の説明】 １ 変圧器 ２ 電圧信号アナログ−ディジタル変換器 ３ 変流器 ４ 電流信号アナログ−ディジタル変換器 ５ 乗算器 ６ 信号伝送路切換え部 ７ 正方向測定系統の積分器 ８ 正方向測定系統のパルス発生器 ９ 正方向測定系統の表示器 １０ 逆方向測定系統の積分器 １１ 逆方向測定系統のパルス発生器 １２ 逆方向測定系統の表示器 １３ 正逆判定用積分器 １４ 正逆判定用積分時間制御器 １５ 正逆判定用電流方向判別器 １６ 正逆判定用瞬時電力符号判別器 １７ 正逆判定用符号別時間測定器 １８ 正逆判定用測定時間制御器 １９ 正逆判定用符号比判別器[Explanation of Codes] 1 Transformer 2 Voltage signal analog-digital converter 3 Current transformer 4 Current signal analog-digital converter 5 Multiplier 6 Signal transmission line switching unit 7 Positive direction measuring system integrator 8 Positive direction measuring system Pulse generator 9 Forward direction measurement system display 10 Reverse direction measurement system integrator 11 Reverse direction measurement system pulse generator 12 Reverse direction measurement system display 13 Forward / backward determination integrator 14 Forward / backward determination integration Time controller 15 Forward / reverse determination current direction discriminator 16 Forward / reverse determination instantaneous power sign discriminator 17 Forward / reverse determination code-dependent time measuring device 18 Forward / reverse determination measuring time controller 19 Forward / reverse determination code ratio discriminator
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4159553AJP2531470B2 (en) | 1992-06-18 | 1992-06-18 | Electronic electricity meter |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4159553AJP2531470B2 (en) | 1992-06-18 | 1992-06-18 | Electronic electricity meter |
| Publication Number | Publication Date |
|---|---|
| JPH063383Atrue JPH063383A (en) | 1994-01-11 |
| JP2531470B2 JP2531470B2 (en) | 1996-09-04 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4159553AExpired - LifetimeJP2531470B2 (en) | 1992-06-18 | 1992-06-18 | Electronic electricity meter |
| Country | Link |
|---|---|
| JP (1) | JP2531470B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018132388A (en)* | 2017-02-14 | 2018-08-23 | シャープ株式会社 | Power measurement device, power measurement method, and power measurement program |
| CN116338302A (en)* | 2023-04-27 | 2023-06-27 | 深圳市锐能微科技有限公司 | Electric energy metering method and device, electronic equipment and medium |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5073154A (en)* | 1973-11-02 | 1975-06-17 | ||
| JPS5920863A (en)* | 1982-07-28 | 1984-02-02 | Tokyo Electric Power Co Inc:The | tidal flow energy meter |
| JPS6060566A (en)* | 1983-08-17 | 1985-04-08 | シーメンス・アクチエンゲゼルシヤフト | Electronic type watt-hour meter for bi-power direction |
| JPS6175307A (en)* | 1984-09-21 | 1986-04-17 | Oki Electric Ind Co Ltd | Formation of light guide |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5073154A (en)* | 1973-11-02 | 1975-06-17 | ||
| JPS5920863A (en)* | 1982-07-28 | 1984-02-02 | Tokyo Electric Power Co Inc:The | tidal flow energy meter |
| JPS6060566A (en)* | 1983-08-17 | 1985-04-08 | シーメンス・アクチエンゲゼルシヤフト | Electronic type watt-hour meter for bi-power direction |
| JPS6175307A (en)* | 1984-09-21 | 1986-04-17 | Oki Electric Ind Co Ltd | Formation of light guide |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018132388A (en)* | 2017-02-14 | 2018-08-23 | シャープ株式会社 | Power measurement device, power measurement method, and power measurement program |
| CN116338302A (en)* | 2023-04-27 | 2023-06-27 | 深圳市锐能微科技有限公司 | Electric energy metering method and device, electronic equipment and medium |
| Publication number | Publication date |
|---|---|
| JP2531470B2 (en) | 1996-09-04 |
| Publication | Publication Date | Title |
|---|---|---|
| US4066960A (en) | Electronic kilowatt-hour-meter with error correction | |
| CA1218414A (en) | Electronic watt/watthour meter with automatic error correction and high frequency digital output | |
| US5059896A (en) | Electronic watthour meter | |
| US7417420B2 (en) | Switch to bypass optical diode for reducing power consumption of electrical meters | |
| EP0645636A1 (en) | Electronic watthour meter | |
| EP0240102A2 (en) | Power meter having self-test function | |
| JP3853661B2 (en) | Multi-circuit power measuring device | |
| JP2005189012A (en) | Power measuring device | |
| JP2531470B2 (en) | Electronic electricity meter | |
| JPH0379667B2 (en) | ||
| JP2004226094A (en) | Electronic watt-hour meter | |
| JP2005233879A (en) | Single-phase three-wire watt-hour meter with line current monitoring function and its line current management system | |
| JPH1097331A (en) | Reactive power control device | |
| JP2994184B2 (en) | Single-phase three-wire electronic watt-hour meter | |
| JP3001712B2 (en) | Composite instrument | |
| JP3301660B2 (en) | Electricity meter | |
| KR100229849B1 (en) | Compound transducer | |
| JP2518582B2 (en) | Electronic electricity meter | |
| JP2004138493A (en) | Electronic watt-hour meter | |
| JPH1051958A (en) | Control device for received power | |
| RU2168726C1 (en) | Electric energy meter in multiphase network ( variants ) | |
| RU2054677C1 (en) | Electricity meter | |
| JP3068958B2 (en) | Electronic watt-hour meter | |
| JP2000258476A (en) | Watt hour meter | |
| JPH05297034A (en) | Electronic electricity meter |
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees | Free format text:JAPANESE INTERMEDIATE CODE: R250 | |
| R250 | Receipt of annual fees | Free format text:JAPANESE INTERMEDIATE CODE: R250 | |
| R250 | Receipt of annual fees | Free format text:JAPANESE INTERMEDIATE CODE: R250 | |
| R250 | Receipt of annual fees | Free format text:JAPANESE INTERMEDIATE CODE: R250 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20080627 Year of fee payment:12 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20090627 Year of fee payment:13 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20100627 Year of fee payment:14 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20100627 Year of fee payment:14 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20110627 Year of fee payment:15 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20110627 Year of fee payment:15 | |
| FPAY | Renewal fee payment (prs date is renewal date of database) | Free format text:PAYMENT UNTIL: 20120627 Year of fee payment:16 | |
| EXPY | Cancellation because of completion of term |