JPS6117298B2 - - Google Patents
Info
- Publication number
- JPS6117298B2 JPS6117298B2 JP53037430A JP3743078A JPS6117298B2 JP S6117298 B2 JPS6117298 B2 JP S6117298B2 JP 53037430 A JP53037430 A JP 53037430A JP 3743078 A JP3743078 A JP 3743078A JP S6117298 B2 JPS6117298 B2 JP S6117298B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- current
- pulse width
- amplitude
- current flowing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/127—Arrangements for measuring electric power or power factor by using pulse modulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
【発明の詳細な説明】
本発明は、各相に流れる電流がこの負荷電流に
比例した量で表わされ、これらの量がパルス幅変
調器のマーク−スペース比を制御し、このパルス
幅変調器が、オーム抵抗のみを介して回路電圧に
接続されている振幅変調器の出力を周期的に制御
し、すべての振幅変調器の出力端が相互に接続さ
れており、かつ共通の量子化装置を介して３つの
相のすべてに共通のカウンタを駆動するためのス
テツプモータと接続されている。パルス幅−パル
ス振幅変調法により動作する電子式三相交流電力
量計に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides that the current flowing in each phase is represented by an amount proportional to this load current, and these amounts control the mark-space ratio of the pulse width modulator, and that the pulse width modulation cyclically controls the output of the amplitude modulator, which is connected to the circuit voltage only through an ohmic resistor, the outputs of all amplitude modulators are connected to each other, and a common quantizer is connected with a step motor to drive a common counter to all three phases. This invention relates to an electronic three-phase AC energy meter that operates using a pulse width-pulse amplitude modulation method.
この種の三相交流電力量計では、各相の電位が
異なるため、各相に流れる負荷電流が異なる電圧
レベルで測定されなければならない。そのため、
所要精度に応じて費用がかさむ変流器による電気
絶縁が必要になる。 In this type of three-phase AC energy meter, each phase has a different potential, so the load current flowing through each phase must be measured at different voltage levels. Therefore,
Depending on the required precision, electrical isolation by means of expensive current transformers is required.
単相交流回路における電力および電力量の測定
装置として、測定電流からの入力信号が分流器ま
たは変流器により導き出され、また測定電圧から
導き出された入力信号が直接に入力信号に比例す
る直流電圧に変換され、その際に両測定量の間の
位相関係が公知の回路の１つにより考慮に入れら
れる測定装置はドイツ連邦共和国特許出願公開第
2519668号明細書により既に公知となつている。
さらに、三相交流回路の電力および電力量を測定
するため、２つの電気的アナログ量の積に比例す
るパルス列を発生するためこの種の装置が各相に
それぞれ設けており、個々の装置の出力パルスが
加算され、その際に出力パルスの合計数が３つの
〓〓〓〓
相の負荷電力量に相応するものは既に提案されて
いる。 As a device for measuring power and energy in single-phase alternating current circuits, the input signal from the measured current is derived by a current shunt or current transformer, and the input signal derived from the measured voltage is a direct voltage directly proportional to the input signal. A measuring device in which the phase relationship between the two measured quantities is taken into account by one of the known circuits is disclosed in German patent application no.
It is already known from specification No. 2519668.
Furthermore, in order to measure the power and energy of a three-phase alternating current circuit, a device of this type is provided for each phase to generate a pulse train proportional to the product of two electrical analog quantities, and the output of each device is The pulses are added, and the total number of output pulses is 3 〓〓〓〓
A method corresponding to the phase load power amount has already been proposed.
本発明の基礎になつている課題は、著しく費用
がかさむ通常の変流器および計器用変圧器ならび
に電源装置を使用しないですむように、冒頭に記
載した種類の電子式三相交流電力量計を構成する
ことである。本発明による三相交流電力量計は、
各相に流れる電流が分流器によりこの負荷電流に
比例した量で表わされ、またこの量により制御さ
れるパルス幅変調器が絶縁形結合部を介して振幅
変調器に作用することを特徴とする。 The problem on which the invention is based is to construct an electronic three-phase AC energy meter of the type mentioned at the outset, so as to avoid the use of conventional current transformers and potential transformers and power supplies, which are considerably more expensive. That's true. The three-phase AC power meter according to the present invention includes:
The current flowing in each phase is expressed by a shunt in an amount proportional to this load current, and the pulse width modulator controlled by this amount acts on the amplitude modulator via an insulated coupling part. do.
本発明を、その実施例が原理的に示されている
図面により一層詳細に説明する。 The invention will be explained in more detail with reference to the drawings, in which an embodiment of the invention is shown in principle.
Ｒ，Ｓ，Ｔで三相回路網の相が示されており、
これらの相は導線１ないし３を経て負荷と接続さ
れている。４で系統の中性線が示されている。３
つの相導線１ないし３の各々において分流器５な
いし７により、各相に流れる負荷電流が実際上位
相角および比誤差のない電圧として表わされる。
分流器５ないし７に降下する電圧は非常に小さい
ので、この電圧は増幅器８ないし１０により増幅
される。したがつて増幅８ないし１０の出力端に
は負荷電流に比例した電圧が得られる。この電圧
によりパルス幅変調器１１ないし１３のマークス
ペース比が制御される。線１４ないし１６により
示されているように、パルス幅変調器１１ないし
１３は開閉装置１７ないし１９を介して、しかも
直接にではなく各１つの絶縁形結部３８ないし４
０を介して、負荷電圧に比例する電圧を開閉す
る。この絶縁形結合部はたとえば光結合素子を用
いて実現することができる。デイジタル信号しか
伝達されないので、伝達手段の良度は問題となら
ず、したがつて比較的簡単な手段を絶縁形結合部
に使用することができる。 The phases of the three-phase network are indicated by R, S, and T.
These phases are connected to the load via conductors 1 to 3. 4 shows the neutral line of the system. 3
By means of current shunts 5 to 7 in each of the three phase conductors 1 to 3, the load current flowing in each phase is represented as a voltage practically free of phase angle and ratio errors.
Since the voltage dropping across the shunts 5-7 is very small, this voltage is amplified by the amplifiers 8-10. Therefore, a voltage proportional to the load current is obtained at the output terminals of the amplifiers 8 to 10. This voltage controls the mark-space ratio of the pulse width modulators 11 to 13. As indicated by the lines 14 to 16, the pulse width modulators 11 to 13 are connected to each one of the insulating connections 38 to 4 via the switching devices 17 to 19, but not directly.
0 to open and close a voltage proportional to the load voltage. This insulated coupling portion can be realized using, for example, an optical coupling element. Since only digital signals are transmitted, the quality of the transmission means is not a problem and relatively simple means can therefore be used for the insulating coupling.
振幅変調器２０ないし２２は各１つの抵抗器２
３ないし２５を介して直接に、また反転演算増幅
器２６ないし２８を介して間接にそれぞれの相電
圧に接続されている。そして反転演算増幅器２６
ないし２８を経て流れる電流が前記抵抗器２３な
いし２５を介して流れる電流の反転の極性でしか
も半分の大きさの瞬時値とする。したがつて振幅
変調器２０ないし２２の出力端２９ないし３１に
は、相電圧と相電流との積に比例した電流が得ら
れる。この電流は共通の電流−周波数変換器４９
へ導かれる。電流−周波数変換器４９の出力パル
スはステツプモータ４１を制御し、このステツプ
モータが３つの相Ｒ，Ｓ，Ｔのすべてに共通のカ
ウンタを駆動する。 Amplitude modulators 20 to 22 each include one resistor 2
3 to 25 directly and indirectly via inverting operational amplifiers 26 to 28 to the respective phase voltages. and an inverting operational amplifier 26
The current flowing through resistors 23 to 28 has an instantaneous value of opposite polarity and half the magnitude of the current flowing through resistors 23 to 25. A current proportional to the product of the phase voltage and the phase current is therefore obtained at the outputs 29 to 31 of the amplitude modulators 20 to 22. This current is transferred to a common current-to-frequency converter 49
be led to. The output pulses of the current-to-frequency converter 49 control a step motor 41 which drives a counter common to all three phases R, S, T.
４６ないし４８で、個々の相に対応している電
源装置が示されている。各相の測定装置全体を電
力消費が小さいように構成できるので、実際上ゼ
ナダイオードおよび抵抗器のみから成り、簡単
で、したがつて安価なトランスレスの電源装置を
使用することができる。 At 46-48, the power supplies corresponding to the individual phases are shown. Since the entire measuring device for each phase can be constructed with low power consumption, it is possible to use a simple and therefore inexpensive transformerless power supply, which consists practically only of Zener diodes and resistors.
本発明による三相交流電力量計は、アナログ量
を電気絶縁して伝達しなければならない個所がな
く、デイジタル信号の伝達しか必要としないとい
う利点を有する。この本発明の基礎となつている
原理は他の種類の三相交流電力量計、たとえばス
トカステイツクに動作する電力量計にも適用する
ことができる。 The three-phase alternating current energy meter according to the invention has the advantage that there are no locations where analog quantities must be electrically isolated and transmitted, and only digital signals need to be transmitted. The principles on which the invention is based can also be applied to other types of three-phase AC energy meters, such as energy meters operating in a stochastic manner.
図面は本発明の実施例の概要を示すブロツク図
である。
５〜７……分流器、１１〜１３……パルス幅変
調器、２０〜２２……振幅変調器、３８〜４０…
…絶縁形結合部、４１……ステツプモータ、４２
……カウンタ、４９……量子化装置（電流−周波
数変換器）。
〓〓〓〓
The drawing is a block diagram showing an overview of an embodiment of the present invention. 5-7...Shunt, 11-13...Pulse width modulator, 20-22...Amplitude modulator, 38-40...
...Insulated coupling part, 41...Step motor, 42
...Counter, 49...Quantization device (current-frequency converter). 〓〓〓〓
Claims (1)
量で表わされ、これらの量がパルス幅変調器のマ
ーク・スペース比を制御し、このパルス幅変調器
がオーム抵抗のみを介して回路電圧に接続されて
いる振幅変調器の出力を周期的に制御し、すべて
の振幅変調器の出力端が相互に接続されており、
かつ共通の量子化装置を介して３つの相のすべて
に共通のカウンタを駆動するためのステツプモー
タと接続されているパルス幅−パルス振幅変調法
により動作する電子式三相交流電力量計におい
て、各相に流れる電流が分流器によりこの負荷電
流に比例した量で表わされ、またこの量により制
御されるパルス幅変調器が絶縁形結合部を介して
振幅変調器に作用することを特徴とする三相交流
電力量計。1 The current flowing in each phase is expressed by an amount proportional to this load current, and these amounts control the mark-space ratio of the pulse width modulator, which adjusts the circuit voltage through ohmic resistance only. The output terminals of all amplitude modulators are connected to each other, and the output ends of all amplitude modulators are connected to each other.
In an electronic three-phase alternating current energy meter operated by the pulse width-pulse amplitude modulation method, each phase is The current flowing in the phase is expressed by a shunt in an amount proportional to this load current, and the pulse width modulator controlled by this amount acts on the amplitude modulator via an insulated coupling part. Three-phase AC power meter.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772715321 DE2715321A1 (en) | 1977-04-05 | 1977-04-05 | Digital electronic three=phase electricity meter - has pulse-width and amplitude modulators connected to each phase |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53123977A JPS53123977A (en) | 1978-10-28 |
| JPS6117298B2 true JPS6117298B2 (en) | 1986-05-07 |
Family
ID=6005742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3743078A Granted JPS53123977A (en) | 1977-04-05 | 1978-03-30 | Electronic threeephase ac energy meter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS53123977A (en) |
| DE (1) | DE2715321A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL183424B (en) * | 1977-05-16 | Enertec | ELECTRONIC ENERGY METER. | |
| DE2923341C2 (en) * | 1979-06-08 | 1986-03-20 | Siemens AG, 1000 Berlin und 8000 München | Multiphase electronic electricity meters |
| DE2938238A1 (en) * | 1979-09-21 | 1981-04-09 | Siemens AG, 1000 Berlin und 8000 München | ELECTRONIC THREE-PHASE ELECTRICITY METER FOR THE CAPACITOR TRANSFER METHOD |
| JPS571972A (en) * | 1980-06-04 | 1982-01-07 | Toshiba Corp | Electronic type electric energy meter |
| JPS58187774U (en) * | 1982-06-10 | 1983-12-13 | 横河電機株式会社 | power measurement device |
| EP0278223B1 (en) * | 1987-01-21 | 1992-04-08 | Siemens Aktiengesellschaft | Static power measuring apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2348667B2 (en) * | 1973-09-27 | 1975-08-14 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Electronic kWh counter |
| DE2519668C3 (en) * | 1974-06-05 | 1979-01-18 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Arrangement for generating a sequence of pulses proportional to the product of two analog electrical quantities |
-
1977
- 1977-04-05 DE DE19772715321 patent/DE2715321A1/en active Granted
-
1978
- 1978-03-30 JP JP3743078A patent/JPS53123977A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2715321C2 (en) | 1988-12-08 |
| DE2715321A1 (en) | 1978-10-12 |
| JPS53123977A (en) | 1978-10-28 |
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