JPS6145783B2 - - Google Patents
Info
- Publication number
- JPS6145783B2 JPS6145783B2 JP54030462A JP3046279A JPS6145783B2 JP S6145783 B2 JPS6145783 B2 JP S6145783B2 JP 54030462 A JP54030462 A JP 54030462A JP 3046279 A JP3046279 A JP 3046279A JP S6145783 B2 JPS6145783 B2 JP S6145783B2
- Authority
- JP
- Japan
- Prior art keywords
- error
- voltage
- current detection
- detection section
- section
- 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
- 238000001514 detection method Methods 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000004804 winding Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
【発明の詳細な説明】
本発明は電力量を計量する電力量計に係り、特
に負荷電流を検出する電流検出部の誤差監視を可
能にした電力量計に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a watt-hour meter that measures the amount of electric power, and more particularly to a watt-hour meter that enables error monitoring of a current detection section that detects load current.
第１図は従来の電子式電力量計の構成を示して
いる。第１図において１は負荷電圧ＶLを検出す
る電圧検出部、２は負荷電流ＩLを検出する電流
検出部、３は両検出部１，２の出力信号を積算し
て電力に比例した信号を得る電力検出部、４は電
力検出部３の出力信号をパルス周波数に変換する
変換部、５はパルス周波数を分周する分周部、６
は分周パルスを計数する計数部であつて例えば電
子式又はステツプモータ等の機械式のものがあ
る。７は電子式又は機械式の表示部である。 FIG. 1 shows the configuration of a conventional electronic watt-hour meter. In Fig. 1, 1 is a voltage detection section that detects the load voltage V L , 2 is a current detection section that detects the load current I L , and 3 is a signal proportional to the power obtained by integrating the output signals of both detection sections 1 and 2. 4 is a conversion unit that converts the output signal of the power detection unit 3 into a pulse frequency; 5 is a frequency division unit that divides the pulse frequency; 6
is a counting section that counts frequency-divided pulses, and may be of an electronic type or a mechanical type such as a step motor. 7 is an electronic or mechanical display section.
ところで、上記構成部分のうち特に電流検出部
２の検出誤差の補償として、従来第２図のような
構成をとつている。即ち、この電流検出部２の構
成にあつては、主鉄心１１の他に補助鉄心１２を
備え、この補助鉄心１２に巻装された２次巻線１
３に流れる電流と帰還インピーダンス１４とによ
つて電圧をつくり、これを主鉄心１１の２次巻線
１５側に現われる２次電圧の打消用電圧として用
いて主鉄心１１側の誤差を補償している。１６は
負荷である。 By the way, in order to compensate for the detection error of the current detecting section 2 among the above-mentioned components, a conventional structure as shown in FIG. 2 has been adopted. That is, in the configuration of this current detection section 2, in addition to the main iron core 11, an auxiliary iron core 12 is provided, and a secondary winding 1 wound around the auxiliary iron core 12 is provided.
3 and the feedback impedance 14, this voltage is used as a voltage for canceling the secondary voltage appearing on the secondary winding 15 side of the main iron core 11 to compensate for errors on the main iron core 11 side. There is. 16 is a load.
以下、この誤差の補償について式を用いて具体
的に説明する。今、２つの鉄心１１，１２の２次
巻線１３，１５を同一極性とし、また巻数比（巻
線１３の巻数）：（巻線１５の巻数）＝１：ａ、
巻線１５側に流れる電流をＩとすると、巻線１３
側にはaIの電流が流れる。この時、主鉄心１１側
の巻線１５の２次電圧Ｅは、負荷１６をZ6（但
し、Z6は第１図において電流検出部２側から見た
電力検出部３のインピーダンス）とすれば、
Ｅ＝−（ａ−１）I2Za＋I2Z6 ……(1)
となる。ここで、帰還インピーダンス１４は、
Ｚa＝１／ａ−１×Z6 ……(2)
の関係となるので、(2)式を満足するZ6を選べば、
Ｅ＝−12Z6＋I2Z0＝０ ……(3)
となり、主鉄心１１側の２次電圧ＥはOVとな
る。この結果、主鉄心１１側は負荷１６による負
担がOVとなり、誤差要因のない変流器つまり電
流検出部２を構成できる。 Hereinafter, compensation for this error will be specifically explained using a formula. Now, the secondary windings 13 and 15 of the two iron cores 11 and 12 have the same polarity, and the turns ratio (number of turns of winding 13): (number of turns of winding 15) = 1:a,
If the current flowing to the winding 15 side is I, then the winding 13
A current aI flows through the side. At this time, the secondary voltage E of the winding 15 on the main iron core 11 side is such that the load 16 is Z 6 (where Z 6 is the impedance of the power detection section 3 seen from the current detection section 2 side in Fig. 1). For example, E=-(a-1)I 2 Z a +I 2 Z 6 ...(1). Here, the feedback impedance 14 has the following relationship: Z a =1/a-1×Z 6 ...(2), so if Z 6 is selected that satisfies equation (2), E = -1 2 Z 6 +I 2 Z 0 =0 (3), and the secondary voltage E on the main iron core 11 side becomes OV. As a result, the burden of the load 16 on the main iron core 11 side becomes OV, and a current transformer, that is, the current detection section 2 without any error factors can be configured.
しかし、通常補償回路の回路定数の変化或いは
鉄心１１，１２の劣化等の原因によつて、主鉄心
１１側の２次電圧がOVでなくなることが多く、
この場合には電流検出部２の誤差が増大し電力量
計の誤差となつて現われる。 However, the secondary voltage on the main core 11 side often ceases to be OV due to changes in the circuit constants of the normal compensation circuit or deterioration of the cores 11 and 12.
In this case, the error in the current detection section 2 increases and appears as an error in the watt-hour meter.
従つて、従来の電子式電力量計では、誤差の増
大に気づかずに使用してしまう危険性がある。特
に、大口の取引用計器や計器試験時の基準として
用いる標準電力量計等のように高精度を要求する
計器には不向きである。このため、誤差の目安を
知つて補正するためにも簡単な誤差監視機能を備
えることが望まれていた。 Therefore, there is a risk that the conventional electronic watt-hour meter may be used without being aware of the increased error. In particular, it is unsuitable for meters that require high accuracy, such as meters for large-scale transactions and standard watt-hour meters used as standards during meter tests. Therefore, it has been desired to provide a simple error monitoring function in order to know the standard of error and correct it.
本発明は上記要望に応えるためになされたもの
であつて、電流検出部の誤差を監視し、誤差発生
によつて主鉄心側の２次電圧がOVでなくなつた
ときに報知信号を出力できるようにする電力量計
を提供するものである。 The present invention was made in response to the above-mentioned demands, and is capable of monitoring errors in the current detection unit and outputting a notification signal when the secondary voltage on the main core side is no longer OV due to the occurrence of an error. The present invention provides a watthour meter that performs the following functions.
以下、本発明の実施例について図面を参照して
説明する。即ち、第３図は誤差監視機能をもつた
電流検出部を示し、２１は誤差補償回路を有する
電流変換部、２２は高入力インピーダンスを持つ
た電圧比較器、２３は誤差報知部である。その
他、第３図において第２図と同一部分は同一符号
を付して説明を省略する。 Embodiments of the present invention will be described below with reference to the drawings. That is, FIG. 3 shows a current detecting section with an error monitoring function, 21 is a current converting section having an error compensation circuit, 22 is a voltage comparator with high input impedance, and 23 is an error reporting section. Other parts in FIG. 3 that are the same as those in FIG. 2 are denoted by the same reference numerals, and explanations thereof will be omitted.
次に、第３図に示す電流検出部について第４図
のタイムチヤートを用いて説明する。ここで、第
４図Ａは電圧比較器２２の入力電圧、同図Ｂは同
比較器２２の出力波形を示す。今、仮に誤差補償
回路付きの電流変換部２１において誤差補償回路
の回路定数の変化或いは鉄心の劣化等の原因によ
り、主鉄心１１の２次側の点２４及び接地点２５
間の電圧がOVでなくなつて第４図Ａのように電
圧が発生したとする。この場合、電圧比較器２２
が動作してその出力部が第４図Ｂに示すように
“Ｌ”→“Ｈ”に変化し、この結果、後続の誤差
報知部２３が作動して誤差発生の警報信号に表示
する。従つて、電流検出部２の誤差発生が速やか
に判別でき、補正等の適切な措置を取ることがで
きる。 Next, the current detection section shown in FIG. 3 will be explained using the time chart shown in FIG. 4. Here, FIG. 4A shows the input voltage of the voltage comparator 22, and FIG. 4B shows the output waveform of the comparator 22. Now, suppose that in the current converter 21 with an error compensation circuit, due to a change in the circuit constant of the error compensation circuit or deterioration of the core, the secondary side point 24 and the ground point 25 of the main core 11
Suppose that the voltage between them is no longer OV and a voltage is generated as shown in Figure 4A. In this case, voltage comparator 22
operates and its output changes from "L" to "H" as shown in FIG. 4B, and as a result, the subsequent error notification section 23 operates and displays an alarm signal indicating the occurrence of an error. Therefore, the occurrence of an error in the current detection section 2 can be quickly determined, and appropriate measures such as correction can be taken.
次に、第５図は同じく電流検出部２の他の構成
例である。これは、電圧比較器２２の接地側入力
部に可変形の基準電源２６を設け、誤差補償回路
付き電流変換部２１の誤差判定レベル値をOVに
固定せずにある程度の誤差を許す範囲の電圧値を
可変設定する構成である。 Next, FIG. 5 similarly shows another example of the configuration of the current detection section 2. As shown in FIG. A variable reference power supply 26 is provided at the ground side input section of the voltage comparator 22, and the error judgment level value of the current conversion section 21 with an error compensation circuit is not fixed to OV, but is set to a voltage within a range that allows a certain degree of error. This is a configuration in which values can be set variably.
第６図にその動作のタイムチヤートを示す。同
図Ａは電圧比較器２２の一方入力側の点２４と接
地との間の電圧値を示し、同図Ｂは比較器２２の
出力電圧波形を示している。この場合は、基準電
源２６の設定電圧値をＶRとすれば、第６図に示
すように主鉄心１１の２次側電圧がＶRを越えた
時に電圧比較器２２の出力レベルが“Ｌ”から
“Ｈ”になり、誤差報知器２３から報知信号が出
力することになる。 FIG. 6 shows a time chart of the operation. Figure A shows the voltage value between the point 24 on one input side of the voltage comparator 22 and ground, and Figure B shows the output voltage waveform of the comparator 22. In this case, if the set voltage value of the reference power supply 26 is set to V R , the output level of the voltage comparator 22 will be "L" when the secondary voltage of the main iron core 11 exceeds V R as shown in FIG. ” becomes “H”, and the error annunciator 23 outputs a notification signal.
従つて、本発明の電力量計は、誤差補償回路及
び誤差の監視機能によつて誤差補償回路での誤差
を従来のように校正によらずに即座に知ることが
できる。このことは特に高精度を要求する電力量
計に適用して効果がある。 Therefore, the electric energy meter of the present invention can immediately know the error in the error compensation circuit by using the error compensation circuit and the error monitoring function without requiring calibration as in the conventional method. This is particularly effective when applied to power meters that require high accuracy.
次に、第７図は本発明の他の実施例である。こ
れは電流検出部２の誤差電圧のみでなく、他の部
分での故障検出部３１，３２の出力信号をもOR
ゲート回路３３を経由して誤差報知部２３を作動
せしめる構成としたものである。なお、故障検出
部３１としては、例えば電源装置の電圧がある定
値より変化したときに故障検出信号を出力する等
である。 Next, FIG. 7 shows another embodiment of the present invention. This is not only the error voltage of the current detection section 2, but also the output signals of the failure detection sections 31 and 32 in other parts.
The configuration is such that the error notification section 23 is activated via the gate circuit 33. Note that the failure detection unit 31 outputs a failure detection signal when the voltage of the power supply device changes from a certain fixed value, for example.
次に、第８図は多相電源に適用した例である。
即ち、各相電源に電流検出部２ａ，２ｂ，２ｃを
設け、これらを切替スイツチ４１でサイクリツク
に切替えながら１つの電圧比較器２２に入れ、こ
の出力電圧をラツチ用フリツプ・フロツプ回路４
２でラツチして誤差報知部２３に供給する構成で
ある。 Next, FIG. 8 shows an example applied to a polyphase power supply.
That is, current detection units 2a, 2b, and 2c are provided in each phase power supply, and these are cyclically switched by a changeover switch 41 and input into one voltage comparator 22, and this output voltage is sent to a latch flip-flop circuit 4.
The configuration is such that the signal is latched at 2 and supplied to the error notification section 23.
なお、誤差報知部２３は音声、ランプ又は指示
計の何れでもよいことは言うまでもない。 It goes without saying that the error notification section 23 may be a voice, a lamp, or an indicator.
以上詳記したように本発明によれば、誤差補償
回路で発生する電圧を監視するようにしたので、
例えば回路定数の変化や鉄心の劣化等により誤差
補償回路で充分補償し得ない場合でも誤差電圧を
監視して確実に報知させることができる。また、
監視によつて迅速に誤差電圧を知り得れば、適切
な補正によつて常に正確な電力量を計量すること
が可能である。 As detailed above, according to the present invention, since the voltage generated in the error compensation circuit is monitored,
For example, even if the error compensation circuit cannot sufficiently compensate for changes in circuit constants, deterioration of the iron core, etc., the error voltage can be monitored and reliably reported. Also,
If the error voltage can be quickly known through monitoring, it is possible to always accurately measure the amount of power by making appropriate corrections.
従つて、高精度を要求する基準用の電力量計と
して充分使用できる効果がある。 Therefore, it is effective enough to be used as a reference power meter that requires high accuracy.
第１図は従来の電力量計のブロツク図、第２図
は第１図に示す電流検出部の構成図、第３図は本
発明に係る電力量計の特に電流検出部について示
す構成図、第４図は第３図の動作を説明するタイ
ムチヤート図、第５図は電流検出部の他の例を示
す構成図、第６図は第５図の動作を説明するタイ
ムチヤート図、第７図および第８図は同じく他の
例を示す構成図である。
１…電圧検出部、２…電流検出部、３…電力検
出部、４…変換部、５…分周部、６…計数部、７
…表示部、１１…主鉄心、１２…補助鉄心、２１
…誤差保償回路付き電流交換部、２２…電圧比較
器、２３…誤差報知部、２６…基準電源、３１，
３２…故障検出部、３３…ORゲート回路、２
ａ，２ｂ，２ｃ…電流検出部、４１…切替スイツ
チ、４２…ラツチ用フリツプ・フロツプ回路。
FIG. 1 is a block diagram of a conventional watt-hour meter, FIG. 2 is a block diagram of the current detection section shown in FIG. 1, and FIG. 3 is a block diagram of the current detection section of the watt-hour meter according to the present invention. 4 is a time chart explaining the operation of FIG. 3, FIG. 5 is a configuration diagram showing another example of the current detection section, FIG. 6 is a time chart explaining the operation of FIG. 5, and FIG. 7 is a time chart explaining the operation of FIG. 8 and 8 are configuration diagrams showing another example. DESCRIPTION OF SYMBOLS 1... Voltage detection part, 2... Current detection part, 3... Power detection part, 4... Conversion part, 5... Frequency division part, 6... Counting part, 7
...Display section, 11...Main core, 12...Auxiliary core, 21
...Current exchange unit with error compensation circuit, 22...Voltage comparator, 23...Error notification unit, 26...Reference power supply, 31,
32... Failure detection section, 33... OR gate circuit, 2
a, 2b, 2c... Current detection section, 41... Changeover switch, 42... Flip-flop circuit for latch.
Claims (1)
及び電流検出部で検出しこれら両検出信号を積算
して電力信号を得るものにおいて、前記電流検出
部は、主鉄心の外に補助鉄心を設けこの補助鉄心
の２次巻線側に現われる電圧で前記主鉄心の２次
巻線の２次電圧を消去する誤差補償回路付き電流
変換部と、この誤差補償回路に誤差電圧が発生し
たときその誤差電圧を用いて報知する誤差報知部
とを備えてなることを特徴とする電力量計。 ２ 誤差電圧を用いて報知する場合、誤差の許容
電圧源を設け、誤差電圧が誤差許容電圧値を越え
たとき報知するようにした特許請求の範囲第１項
記載の電力量計。 ３ 各相ごとに電流検出部を設け、これらを切替
スイツチでサイクリツクに切替えながら何れか又
は全ての電流検出部で誤差電圧の発生している時
にその電圧を用いて報知するようにした特許請求
の範囲第１項記載の電力量計。[Claims] 1. In a device in which a load voltage and a load current are detected by a voltage detection section and a current detection section, respectively, and a power signal is obtained by integrating these two detection signals, the current detection section is located outside the main core. An auxiliary iron core is provided, and an error voltage is generated in the error compensation circuit. and an error notification section that uses the error voltage to notify when the error occurs. 2. The watt-hour meter according to claim 1, in which when the error voltage is used for notification, an error tolerance voltage source is provided, and notification is made when the error voltage exceeds the error tolerance voltage value. 3. A patent claim in which a current detection section is provided for each phase, and when an error voltage is generated in any or all of the current detection sections while cyclically switching these sections using a changeover switch, the voltage is used to notify the user. A power meter according to scope 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3046279A JPS55122163A (en) | 1979-03-15 | 1979-03-15 | Wattmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3046279A JPS55122163A (en) | 1979-03-15 | 1979-03-15 | Wattmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55122163A JPS55122163A (en) | 1980-09-19 |
| JPS6145783B2 true JPS6145783B2 (en) | 1986-10-09 |
Family
ID=12304547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3046279A Granted JPS55122163A (en) | 1979-03-15 | 1979-03-15 | Wattmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55122163A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050095534A (en) * | 2004-12-01 | 2005-09-29 | (주)신우디엔시 | A watt-hour metering apparatus |
-
1979
- 1979-03-15 JP JP3046279A patent/JPS55122163A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55122163A (en) | 1980-09-19 |
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