JP2003302429A - Current measuring device - Google Patents
Current measuring deviceInfo
- Publication number
- JP2003302429A JP2003302429A JP2002105010A JP2002105010A JP2003302429A JP 2003302429 A JP2003302429 A JP 2003302429A JP 2002105010 A JP2002105010 A JP 2002105010A JP 2002105010 A JP2002105010 A JP 2002105010A JP 2003302429 A JP2003302429 A JP 2003302429A
- Authority
- JP
- Japan
- Prior art keywords
- current
- current measuring
- sensor
- measuring device
- changeover switch
- 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.)
- Granted
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電流測定装置に関
し、詳しくは、電流センサまたはその周辺部分における
電圧降下の補正に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current measuring device, and more particularly to correction of a voltage drop in a current sensor or its peripheral portion.
【０００２】[0002]
【従来の技術】電力計の電流測定部をはじめ、電流計、
デジタルマルチメータなどの電流測定機能を有する電流
測定装置では、電流センサまたはその周辺部分における
電圧降下が測定対象における電圧降下に加算されること
になり、電流センサを接続しない実際の使用状態と同じ
状態で測定対象に流れる電流を測定することは困難であ
る。2. Description of the Related Art A current measuring section of an electric power meter
In a current measuring device with a current measuring function such as a digital multimeter, the voltage drop in the current sensor or its peripheral parts is added to the voltage drop in the measurement target, and the same condition as the actual use condition without the current sensor connected. It is difficult to measure the current flowing through the measurement target at.
【０００３】そのため、電流測定装置では、従来からこ
のような機器自体における電圧降下を補正するためのパ
ラメータを「計器損失」として□Ω、□□H、□□Fなど
の入力インピーダンスで表記することが行われている。Therefore, in the current measuring device, the parameter for correcting the voltage drop in the device itself is conventionally expressed as "meter loss" by input impedance such as □ Ω, □□ H, □□ F. Is being done.
【０００４】図３は、従来のこのような電流測定装置の
一例を示す構成ブロック図であり、電力計をＶ−Ｉ接続
した例を示している。図において、電圧入力部１０の高
圧端子１１には抵抗１２を介してアンプ１３が接続され
ている。アンプ１３の入力端子と出力端子間には抵抗１
４が接続されている。低圧端子１５は共通電位点に接続
されている。FIG. 3 is a configuration block diagram showing an example of such a conventional current measuring device, and shows an example in which a power meter is connected by VI. In the figure, an amplifier 13 is connected to a high voltage terminal 11 of the voltage input section 10 via a resistor 12. A resistor 1 is placed between the input and output terminals of the amplifier 13.
4 is connected. The low voltage terminal 15 is connected to the common potential point.
【０００５】電流入力部２０の電流端子２１と共通端子
２２には、４端子の電流センサ２３の端子ａ，ｂが接続
されている。電流センサ２３の端子ｃにはアンプ２４が
接続され、端子ｄは共通電位点に接続されている。To the current terminal 21 and the common terminal 22 of the current input section 20, terminals a and b of a four-terminal current sensor 23 are connected. The amplifier 24 is connected to the terminal c of the current sensor 23, and the terminal d is connected to the common potential point.
【０００６】電源３０の一端は電圧入力部１０の高圧端
子１１および負荷４０の一端に接続され、電源３０の他
端は電圧入力部１０の低圧端子１５および電流入力部２
０の共通端子２２に接続されている。負荷４０の他端は
電流入力部２０の電流端子２１に接続されている。One end of the power supply 30 is connected to the high voltage terminal 11 of the voltage input section 10 and one end of the load 40, and the other end of the power supply 30 is connected to the low voltage terminal 15 of the voltage input section 10 and the current input section 2.
0 common terminal 22. The other end of the load 40 is connected to the current terminal 21 of the current input unit 20.
【０００７】抵抗１２を介してアンプ１３が接続されて
いる。アンプ１３の入力端子と出力端子間には抵抗１４
が接続されている。低圧端子１５は共通電位点に接続さ
れている。An amplifier 13 is connected via a resistor 12. A resistor 14 is provided between the input terminal and the output terminal of the amplifier 13.
Are connected. The low voltage terminal 15 is connected to the common potential point.
【０００８】このようなＶ−Ｉ接続構成によれば、負荷
４０に流れる電流は電流センサ２３にも流れる。そし
て、電流センサ２３がシャントの場合には、電流センサ
２３の電圧降下に基づいて電流値を測定する。電流セン
サ２３がＣＴ（変流器）の場合には、測定電流を適切な
電流値に変えた（変流した）後、電圧に変換して電流値
を測定する。According to such a VI connection structure, the current flowing through the load 40 also flows through the current sensor 23. When the current sensor 23 is a shunt, the current value is measured based on the voltage drop of the current sensor 23. When the current sensor 23 is a CT (current transformer), the measured current is changed (changed) to an appropriate current value and then converted into a voltage to measure the current value.
【０００９】[0009]
【発明が解決しようとする課題】ところで、図３の従来
構成では、負荷４０と直列に電流入力部２０が接続され
ているので、電流センサ２３における電圧降下も負荷４
０の電圧降下に加算されて測定されて誤差要因になって
いる。By the way, in the conventional configuration of FIG. 3, since the current input unit 20 is connected in series with the load 40, the voltage drop in the current sensor 23 also occurs in the load 4.
It is added to the voltage drop of 0 and measured, which is an error factor.
【００１０】負荷４０の電圧降下を正確に測定するため
には、このような電流センサ２３における電圧降下をは
じめとする電流入力部２０系統における誤差分を補正す
る必要があるが、このような電流センサ２３における電
圧降下は「計器損失」として定格仕様の一項目に表記し
ているのが一般的であり、各機器毎の個別値を記載する
ことは測定条件が特定できないことなどから困難であ
る。In order to accurately measure the voltage drop of the load 40, it is necessary to correct the error component in the current input section 20 system including the voltage drop in the current sensor 23. The voltage drop in the sensor 23 is generally described in one item of the rating specifications as "meter loss", and it is difficult to describe an individual value for each device because the measurement conditions cannot be specified. .
【００１１】また、電流の測定範囲を広げるために、電
流センサを複数個内蔵してそれらを切り換えることも行
われているが、この場合には切換スイッチの損失も無視
できない。切換スイッチの損失は切換スイッチのメーカ
ー仕様に頼っているのが現状であり、実際の損失は把握
できていない。このため、各機器の仕様で測定精度を落
とさざるを得ないうえに、各機器の損失を確認できない
という問題もある。Further, in order to widen the current measuring range, a plurality of current sensors are built in and switched, but in this case, the loss of the changeover switch cannot be ignored. At present, the loss of the changeover switch depends on the manufacturer's specifications of the changeover switch, and the actual loss cannot be grasped. For this reason, there is a problem that the measurement accuracy must be lowered according to the specifications of each device, and the loss of each device cannot be confirmed.
【００１２】本発明は、このような従来の問題点を解決
するものであり、その目的は、電流センサまたはその周
辺部分の計器損失を測定でき、高精度の電流測定が行え
る電流測定装置を提供することにある。The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a current measuring device capable of measuring the instrument loss of a current sensor or a peripheral portion thereof and performing current measurement with high accuracy. To do.
【００１３】[0013]
【課題を解決するための手段】このような目的を達成す
る請求項１の発明は、電流センサを用いた電流測定装置
において、装置の内部に、電流センサまたはその周辺部
分における電圧降下を測定する計器損失測定手段を設け
たことを特徴とする。According to the invention of claim 1, which achieves the above object, in a current measuring device using a current sensor, a voltage drop in the current sensor or a peripheral portion thereof is measured inside the device. It is characterized in that instrument loss measuring means is provided.
【００１４】請求項２の発明は、請求項１記載の電流測
定装置において、計器損失測定手段は、電流センサの測
定端子側の電圧と出力端子側の電圧とを切り換えるよう
に接続された切換スイッチを含むことを特徴とする。According to a second aspect of the invention, in the current measuring device according to the first aspect, the instrument loss measuring means is connected so as to switch between the voltage on the measuring terminal side and the voltage on the output terminal side of the current sensor. It is characterized by including.
【００１５】請求項３の発明は、請求項１または請求項
２記載の電流測定装置において、電流センサは、電流測
定端子間に、低電流測定用のセンサと大電流測定用のセ
ンサとが直列接続されたことを特徴とする。According to a third aspect of the present invention, in the current measuring device according to the first or second aspect, the current sensor includes a low current measuring sensor and a large current measuring sensor connected in series between the current measuring terminals. It is connected.
【００１６】請求項４の発明は、請求項１または請求項
２記載の電流測定装置において、電流センサは、電流測
定端子間に、低電流測定用のセンサと大電流測定用のセ
ンサとが並列接続されたことを特徴とする。According to a fourth aspect of the present invention, in the current measuring device according to the first or second aspect, the current sensor includes a low current measuring sensor and a large current measuring sensor in parallel between the current measuring terminals. It is connected.
【００１７】請求項５の発明は、請求項１から請求項４
のいずれかに記載の電流測定装置において、電流センサ
は、抵抗、変流器またはホール素子のいずれかであるこ
とを特徴とする。The invention of claim 5 is from claim 1 to claim 4.
In the current measuring device according to any one of 1 to 3, the current sensor is any one of a resistor, a current transformer, and a Hall element.
【００１８】請求項６の発明は、請求項１から請求項５
のいずれかに記載の電流測定装置において、電流測定装
置は、電力計の電流入力部であることを特徴とする。The invention of claim 6 is from claim 1 to claim 5.
In the current measuring device according to any one of 1 to 3, the current measuring device is a current input unit of a power meter.
【００１９】請求項７の発明は、請求項１から請求項５
のいずれかに記載の電流測定装置において、電流測定装
置は、電流計であることを特徴とする。The invention of claim 7 is from claim 1 to claim 5.
In the current measuring device according to any one of 1 to 3, the current measuring device is an ammeter.
【００２０】請求項８の発明は、請求項１から請求項５
のいずれかに記載の電流測定装置において、電流測定装
置は、デジタルマルチメータであることを特徴とする。The invention of claim 8 is from claim 1 to claim 5.
In the current measuring device according to any one of 1 to 3, the current measuring device is a digital multimeter.
【００２１】これらにより、電流測定装置の内部におけ
る電流センサまたはその周辺部分における電圧降下を測
定でき、高精度の電流測定が行える。As a result, the voltage drop in the current sensor inside the current measuring device or its peripheral portion can be measured, and the current can be measured with high accuracy.
【００２２】[0022]
【発明の実施の形態】以下、図面を用いて本発明を詳し
く説明する。図１および図２はそれぞれ本発明の実施の
形態の一例を示す主要部の構成ブロック図であり、図３
と共通する部分には同一の符号を付けている。図１は低
電流用の電流センサ２５と大電流用の電流センサ２６と
を直列接続した例であり、図２は低電流用の電流センサ
２５と大電流用の電流センサ２６とを並列接続した例で
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. 1 and 2 are configuration block diagrams of a main part showing an example of an embodiment of the present invention.
The same reference numerals are given to the portions common to. FIG. 1 shows an example in which a current sensor 25 for low current and a current sensor 26 for large current are connected in series, and in FIG. 2, a current sensor 25 for low current and a current sensor 26 for large current are connected in parallel. Here is an example.
【００２３】図１において、電流センサ２５の一端は電
流端子２１に接続されるとともに切換スイッチＳＷ１の
一方の固定接点ａおよび切換スイッチＳＷ２の固定接点
ａに接続され、他端は電流センサ２６の一端に接続され
るとともに切換スイッチＳＷ１の可動接点ｃに接続さ
れ、電流センサ２５の出力端子は切換スイッチＳＷ２の
固定接点ｂに接続されている。In FIG. 1, one end of the current sensor 25 is connected to the current terminal 21 and one fixed contact a of the changeover switch SW1 and the fixed contact a of the changeover switch SW2, and the other end is one end of the current sensor 26. Is connected to the movable contact c of the changeover switch SW1, and the output terminal of the current sensor 25 is connected to the fixed contact b of the changeover switch SW2.
【００２４】電流センサ２６の他端は共通端子２２に接
続されるとともに切換スイッチＳＷ３の固定接点ａ，ｂ
に接続され、電流センサ２６の出力端子は切換スイッチ
ＳＷ２の固定接点ｃに接続されている。The other end of the current sensor 26 is connected to the common terminal 22 and the fixed contacts a and b of the changeover switch SW3.
The output terminal of the current sensor 26 is connected to the fixed contact c of the changeover switch SW2.
【００２５】切換スイッチＳＷ１の固定接点ｂは開放さ
れ、切換スイッチＳＷ２の可動接点ｄはアンプ２４に接
続され、切換スイッチＳＷ３の可動接点ｃは共通電位点
に接続されている。The fixed contact b of the changeover switch SW1 is opened, the movable contact d of the changeover switch SW2 is connected to the amplifier 24, and the movable contact c of the changeover switch SW3 is connected to the common potential point.
【００２６】これら切換スイッチＳＷ１〜ＳＷ３の可動
接点は、測定対象に応じて以下のように連動して切換駆
動される。The movable contacts of these changeover switches SW1 to SW3 are interlocked and driven in the following manner according to the object to be measured.
【００２７】＜低電流測定＞
切換スイッチＳＷ１→固定接点ｂ
切換スイッチＳＷ２→固定接点ｂ
切換スイッチＳＷ３→固定接点ｂ
これにより、測定電流は、電流端子２１と共通端子２２
間に直列接続された電流センサ２５と電流センサ２６を
流れることになり、低電流を測定できる。<Low current measurement> Changeover switch SW1 → fixed contact b Changeover switch SW2 → fixed contact b Changeover switch SW3 → fixed contact b As a result, the measured current is the current terminal 21 and the common terminal 22.
The current flows through the current sensor 25 and the current sensor 26 connected in series between them, and a low current can be measured.
【００２８】＜大電流測定＞
切換スイッチＳＷ１→固定接点ａ
切換スイッチＳＷ２→固定接点ｃ
切換スイッチＳＷ３→固定接点ｂ
これにより、測定電流は、電流端子２１と共通端子２２
間に直列接続された電流センサ２５と電流センサ２６の
うち電流センサ２６のみを流れることになり、大電流を
測定できる。<Large current measurement> Changeover switch SW1 → fixed contact a Changeover switch SW2 → fixed contact c Changeover switch SW3 → fixed contact b As a result, the measured current is the current terminal 21 and the common terminal 22.
Only the current sensor 26 out of the current sensors 25 and 26 connected in series between them flows, and a large current can be measured.
【００２９】＜低電流測定時の計器損失測定＞
切換スイッチＳＷ１→固定接点ｂ
切換スイッチＳＷ２→固定接点ａ
切換スイッチＳＷ３→固定接点ａ
これにより、測定電流が電流端子２１と共通端子２２間
に直列接続された電流センサ２５と電流センサ２６を流
れる状態で、直列接続された電流センサ２５と電流セン
サ２６に起因する計器損失を測定できる。<Measurement loss measurement at low current measurement> Changeover switch SW1 → fixed contact b Changeover switch SW2 → fixed contact a Changeover switch SW3 → fixed contact a As a result, the measured current is connected in series between the current terminal 21 and the common terminal 22. With the current sensor 25 and the current sensor 26 connected to each other, the instrument loss caused by the current sensor 25 and the current sensor 26 connected in series can be measured.
【００３０】＜大電流測定時の計器損失測定＞
切換スイッチＳＷ１→固定接点ａ
切換スイッチＳＷ２→固定接点ａ
切換スイッチＳＷ３→固定接点ａ
これにより、測定電流が電流端子２１と共通端子２２間
に直列接続された電流センサ２５と電流センサ２６のう
ち電流センサ２６のみを流れる状態で、電流センサ２６
に起因する計器損失を測定できる。<Measurement loss measurement at large current measurement> Changeover switch SW1 → fixed contact a Changeover switch SW2 → fixed contact a Changeover switch SW3 → fixed contact a As a result, the measured current is connected in series between the current terminal 21 and the common terminal 22. In the state where only the current sensor 26 out of the connected current sensors 25 and 26 flows, the current sensor 26
It is possible to measure the instrument loss due to.
【００３１】図２において、電流端子２１は、切換スイ
ッチＳＷ１の可動接点ｃに接続されるとともに切換スイ
ッチＳＷ２の固定接点ａに接続されている。In FIG. 2, the current terminal 21 is connected to the movable contact c of the changeover switch SW1 and the fixed contact a of the changeover switch SW2.
【００３２】電流センサ２５の一端は切換スイッチＳＷ
１の一方の固定接点ａに接続され、電流センサ２５の他
端は共通端子２２および切換スイッチＳＷ３の固定接点
ａ，ｂに接続され、電流センサ２５の出力端子は切換ス
イッチＳＷ２の他方の固定接点ｂに接続されている。One end of the current sensor 25 has a changeover switch SW.
1 is connected to one fixed contact a, the other end of the current sensor 25 is connected to the common terminal 22 and fixed contacts a and b of the changeover switch SW3, and the output terminal of the current sensor 25 is the other fixed contact of the changeover switch SW2. connected to b.
【００３３】電流センサ２６の一端は切換スイッチＳＷ
１の他方の固定接点ｂに接続され、電流センサ２６の他
端は共通端子２２および切換スイッチＳＷ３の固定接点
ａ，ｂに接続され、電流センサ２６の出力端子は切換ス
イッチＳＷ２の他方の固定接点ｃに接続されている。One end of the current sensor 26 has a changeover switch SW.
1 is connected to the other fixed contact b, the other end of the current sensor 26 is connected to the common terminal 22 and the fixed contacts a and b of the changeover switch SW3, and the output terminal of the current sensor 26 is the other fixed contact of the changeover switch SW2. connected to c.
【００３４】これら切換スイッチＳＷ１〜ＳＷ３の可動
接点は、測定対象に応じて以下のように連動して切換駆
動される。The movable contacts of the changeover switches SW1 to SW3 are interlocked and driven in the following manner according to the object to be measured.
【００３５】＜低電流測定＞
切換スイッチＳＷ１→固定接点ａ
切換スイッチＳＷ２→固定接点ｂ
切換スイッチＳＷ３→固定接点ｂ
これにより、測定電流は、電流端子２１と共通端子２２
間に並列接続された電流センサ２５と電流センサ２６の
うちの電流センサ２５を流れることになり、低電流を測
定できる。<Low current measurement> Changeover switch SW1 → fixed contact a Changeover switch SW2 → fixed contact b Changeover switch SW3 → fixed contact b As a result, the measured current is the current terminal 21 and the common terminal 22.
The current sensor 25 out of the current sensors 25 and 26 connected in parallel between them flows, and a low current can be measured.
【００３６】＜大電流測定＞
切換スイッチＳＷ１→固定接点ｂ
切換スイッチＳＷ２→固定接点ｃ
切換スイッチＳＷ３→固定接点ｂ
これにより、測定電流は、電流端子２１と共通端子２２
間に並列接続された電流センサ２５と電流センサ２６の
うちの電流センサ２６を流れることになり、大電流を測
定できる。<Large current measurement> Changeover switch SW1 → fixed contact b Changeover switch SW2 → fixed contact c Changeover switch SW3 → fixed contact b As a result, the measured current is the current terminal 21 and the common terminal 22.
The current sensor 25 out of the current sensors 25 and 26 connected in parallel between them flows, and a large current can be measured.
【００３７】＜低電流測定時の計器損失測定＞
切換スイッチＳＷ１→固定接点ａ
切換スイッチＳＷ２→固定接点ａ
切換スイッチＳＷ３→固定接点ａ
これにより、測定電流が電流端子２１と共通端子２２間
に並列接続された電流センサ２５と電流センサ２６のう
ちの電流センサ２５を流れる状態で、電流センサ２５に
起因する計器損失を測定できる。<Measurement loss measurement at low current measurement> Changeover switch SW1 → fixed contact a Changeover switch SW2 → fixed contact a Changeover switch SW3 → fixed contact a As a result, the measured current is paralleled between the current terminal 21 and the common terminal 22. The meter loss caused by the current sensor 25 can be measured in a state where the current sensor 25 out of the connected current sensors 25 and 26 flows.
【００３８】＜大電流測定時の計器損失測定＞
切換スイッチＳＷ１→固定接点ｂ
切換スイッチＳＷ２→固定接点ａ
切換スイッチＳＷ３→固定接点ａ
これにより、測定電流が電流端子２１と共通端子２２間
に並列接続された電流センサ２５と電流センサ２６のう
ちの電流センサ２６を流れる状態で、電流センサ２６に
起因する計器損失を測定できる。<Measurement loss measurement during large current measurement> Changeover switch SW1 → fixed contact b Changeover switch SW2 → fixed contact a Changeover switch SW3 → fixed contact a Due to this, the measured current is paralleled between the current terminal 21 and the common terminal 22. The meter loss caused by the current sensor 26 can be measured in a state where the current sensor 26 out of the connected current sensors 25 and 26 flows.
【００３９】ここで、これら通常測定における電力値を
Ｗ１として電流値をＡ１とし、計器損失測定における電
力値をＷ２として電流値をＡ２とし、電流センサのイン
ピーダンスをＰとすると、電流端子２１と共通端子２２
間の電圧Ｖは、
Ｖ＝Ａ２×Ｖ
となる。また、電流値をＡ１とし、電力値Ｗ１とＷ２の
位相差をθとすると、計器損失Ｗｒは、
Ｗｒ＝Ｖ×Ａ１×cosθ
となる。Here, assuming that the power value in these normal measurements is W1 and the current value is A1, the power value in the instrument loss measurement is W2 and the current value is A2, and the impedance of the current sensor is P, the current terminal 21 is common. Terminal 22
The voltage V between them is V = A2 × V. When the current value is A1 and the phase difference between the power values W1 and W2 is θ, the instrument loss Wr is Wr = V × A1 × cos θ.
【００４０】なお、切換スイッチＳＷ３は、電流センサ
２５，２６から共通端子２２までのインピーダンスが十
分低いと判断できる場合には省略してもよい。The changeover switch SW3 may be omitted if it can be determined that the impedance from the current sensors 25 and 26 to the common terminal 22 is sufficiently low.
【００４１】このように電流センサに起因する計器損失
を測定する手段を設けることにより、電流測定装置の仕
様における計器損失を明確にできる。By thus providing the means for measuring the instrument loss caused by the current sensor, the instrument loss in the specifications of the current measuring device can be clarified.
【００４２】また、実際の測定使用状態において必要に
応じて計器損失を測定でき、これら損失測定値に基づい
て測定値を補正することにより高精度の測定が行える。Further, the instrument loss can be measured as needed in the actual measurement and use state, and highly accurate measurement can be performed by correcting the measurement value based on these loss measurement values.
【００４３】また、これらの切換測定を行うことによ
り、測定装置を構成する切換スイッチの接点の接触状態
を的確に把握でき、接点の劣化や接触不良などに起因す
る誤動作や誤測定の発生を防止できる。By performing these switching measurements, it is possible to accurately grasp the contact state of the contacts of the changeover switch that constitutes the measuring device, and prevent malfunctions and erroneous measurements due to contact deterioration and contact failure. it can.
【００４４】さらに、実際の接続状態における計器損失
が測定できることから、特に電力測定においてＩ−Ｖ接
続にすべきかＶ−Ｉ接続にすべきかの判断がつきかねる
場合に、その判断を補助するための情報が得られるFurther, since the meter loss in the actual connection state can be measured, it is possible to assist the judgment especially when it is impossible to judge whether to make the IV connection or the VI connection in the power measurement. Get information
【００４５】なお、上記実施例では電力計の電流入力部
について説明したが、本発明は電流値を測定する電流測
定機器全般に適用可能である。Although the current input section of the wattmeter has been described in the above embodiment, the present invention is applicable to all current measuring devices for measuring current values.
【００４６】すなわち、電流測定時の計器損失がわかる
ことにより、電流センサを接続しない実際の使用状態で
負荷に流れる電流値を正確に測定できる。That is, by knowing the instrument loss at the time of measuring the current, the value of the current flowing through the load can be accurately measured in the actual use condition without connecting the current sensor.
【００４７】そして、電力発生側の負荷変動特性も正確
に測定できる。電流発生器の場合には損失を含めて電流
で制御できるので変動がほとんど現われることはない
が、出力電圧に上限があるので上限に達しているかいな
いかなどの確認も容易になり、系全体の効率測定もより
正確にできる。The load fluctuation characteristic on the power generation side can also be accurately measured. In the case of a current generator, it can be controlled by the current including the loss, so there is almost no fluctuation, but since the output voltage has an upper limit, it is easy to check whether it has reached the upper limit, etc. The efficiency measurement can also be made more accurate.
【００４８】[0048]
【発明の効果】以上説明したように、本発明によれば、
電流センサまたはその周辺部分の計器損失を測定でき、
実使用状態での高精度の電流測定が行える電流測定装置
が実現できる。As described above, according to the present invention,
Can measure the instrument loss of the current sensor or its surroundings,
It is possible to realize a current measurement device that can perform high-precision current measurement in actual use.
【図１】本発明の実施の形態の一例を示す構成ブロック
図である。FIG. 1 is a configuration block diagram showing an example of an embodiment of the present invention.
【図２】本発明の実施の形態の他の例を示す構成ブロッ
ク図である。FIG. 2 is a configuration block diagram showing another example of the embodiment of the present invention.
【図３】従来の電流測定装置の一例を示す構成ブロック
図である。FIG. 3 is a configuration block diagram showing an example of a conventional current measuring device.
２０ 電流入力部 ２１ 電流端子 ２２ 共通端子 ２３ 電流センサ ２４ アンプ ＳＷ１〜ＳＷ３ 切換スイッチ 20 Current input section 21 Current terminal 22 common terminal 23 Current sensor 24 amplifiers SW1 to SW3 changeover switch
Claims (8)
て、 装置の内部に、電流センサまたはその周辺部分における
電圧降下を測定する計器損失測定手段を設けたことを特
徴とする電流測定装置。1. A current measuring device using a current sensor, wherein a device loss measuring means for measuring a voltage drop in the current sensor or a peripheral portion thereof is provided inside the device.
子側の電圧と出力端子側の電圧とを切り換えるように接
続された切換スイッチを含むことを特徴とする請求項１
記載の電流測定装置。2. The instrument loss measuring means includes a changeover switch connected so as to switch between a voltage on the measurement terminal side and a voltage on the output terminal side of the current sensor.
The current measuring device described.
測定用のセンサと大電流測定用のセンサとが直列接続さ
れたことを特徴とする請求項１または請求項２記載の電
流測定装置。3. The current measuring device according to claim 1, wherein a current measuring sensor has a low current measuring sensor and a large current measuring sensor connected in series between the current measuring terminals. apparatus.
測定用のセンサと大電流測定用のセンサとが並列接続さ
れたことを特徴とする請求項１または請求項２記載の電
流測定装置。4. The current measuring device according to claim 1, wherein a low current measuring sensor and a large current measuring sensor are connected in parallel between the current measuring terminals. apparatus.
素子のいずれかであることを特徴とする請求項１から請
求項４のいずれかに記載の電流測定装置。5. The current measuring device according to claim 1, wherein the current sensor is one of a resistor, a current transformer, and a Hall element.
ることを特徴とする請求項１から請求項５のいずれかに
記載の電流測定装置。6. The current measuring device according to any one of claims 1 to 5, wherein the current measuring device is a current input unit of a power meter.
とする請求項１から請求項５のいずれかに記載の電流測
定装置。7. The current measuring device according to claim 1, wherein the current measuring device is an ammeter.
あることを特徴とする請求項１から請求項５のいずれか
に記載の電流測定装置。8. The current measuring device according to claim 1, wherein the current measuring device is a digital multimeter.
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|---|---|---|---|---|
| CN102901865A (en) * | 2012-10-31 | 2013-01-30 | 北京经纬恒润科技有限公司 | Motor phase current detection circuit |
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|---|---|---|---|---|
| CN102901865A (en) * | 2012-10-31 | 2013-01-30 | 北京经纬恒润科技有限公司 | Motor phase current detection circuit |
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