JP2016042045A - Test device for watthour meter - Google Patents

Test device for watthour meter Download PDF

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JP2016042045A
JP2016042045A JP2014165509A JP2014165509A JP2016042045A JP 2016042045 A JP2016042045 A JP 2016042045A JP 2014165509 A JP2014165509 A JP 2014165509A JP 2014165509 A JP2014165509 A JP 2014165509A JP 2016042045 A JP2016042045 A JP 2016042045A
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transformer
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山 卓 宏 土
Takahiro Tsuchiyama
山 卓 宏 土
越 順 川
Jun Kawagoe
越 順 川
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Japan Electric Meters Inspection Corp JEMIC
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Abstract

PROBLEM TO BE SOLVED: To provide a test device capable of an actual load test of a watthour meter using an existing test power source.SOLUTION: A test device includes: a voltage circuit for connecting voltage terminals of a plurality of watthour meters WH to be tested with a voltage source VS; and a current circuit for connecting current terminals of the watthour meters to be tested with a current source CS via an insulated current transformer CT. The test device performs an actual load test by supplying voltage and current to the watthour meters to be tested. The test device comprises: a current detector CTfor detecting current i supplied to the insulated current transformer by the current source; a current/voltage converter I/V for forming a voltage signal vcorresponding to the current detected by the current detector; and a negative impedance circuit NI for amplifying a compensation voltage signal and supplying it to the current circuit so as to compensate a voltage drop due to impedance of the insulated current transformer. Alternatively, the test device may use a voltage detector instead of the current detector, and a voltage-to-voltage converter V/V instead of the current/voltage converter.SELECTED DRAWING: Figure 1

Description

本発明は、電力量計の試験装置に係わり、とくに実負荷試験における複数の計器を同時に測定可能にする対策を施した試験装置に関する。   The present invention relates to a watt-hour meter test apparatus, and more particularly to a test apparatus with a measure for enabling a plurality of meters to be measured simultaneously in an actual load test.

電力量計の試験装置では、虚負荷計器については虚負荷試験を行っている。これは、図３Ａに示すように、試験台にセットされた多数の電力量計ＷＨにおける、計測時は閉じている短絡片ＳＷ１，ＳＷ２を、試験時は開いて電圧回路と電流回路とを切り離した状態とし、電圧回路を電圧源に、電流回路を電流源に接続して試験を行うものである（特許文献１参照）。   In the watt-hour meter test device, the imaginary load test is performed for the imaginary load meter. As shown in FIG. 3A, in the watt-hour meter WH set on the test stand, the short-circuiting pieces SW1 and SW2 that are closed at the time of measurement are opened, and the voltage circuit and the current circuit are disconnected at the time of the test. The test is performed with the voltage circuit connected to the voltage source and the current circuit connected to the current source (see Patent Document 1).

他方、近年普及が進んでいる電子式電力量計は、図３Ｂから分かるように、上記短絡片が設けられていないため、虚負荷試験は行えず、電流回路に絶縁変流器を介挿する実負荷試験を行う（特許文献２参照）。   On the other hand, as the electronic watt-hour meter that has been spreading in recent years does not have the short-circuit piece as shown in FIG. 3B, the imaginary load test cannot be performed, and an insulation current transformer is inserted in the current circuit. An actual load test is performed (see Patent Document 2).

特許第4943046号公報Japanese Patent No. 4943046 特開2007-232599号公報JP 2007-232599

上記の実負荷試験の場合、虚負荷試験では不要の絶縁変流器を用いるので、試験装置は、被試験電力量計に加えて絶縁変流器の負担が加わる。このため、虚負荷試験に用いていた電源装置よりも大容量の電源装置を必要とする。   In the case of the actual load test described above, an unnecessary insulated current transformer is used in the imaginary load test. Therefore, in addition to the watt-hour meter to be tested, the test apparatus adds a burden on the insulated current transformer. For this reason, a power supply device having a larger capacity than that of the power supply device used for the imaginary load test is required.

すなわち、図４Ａに示す虚負荷試験回路と図４Ｂに示す実負荷試験回路とを対比すると分かるように、実負荷試験回路（図４Ｂ）では虚負荷試験回路（図４Ａ）にはない絶縁変流器がある。   That is, as can be seen by comparing the imaginary load test circuit shown in FIG. 4A with the actual load test circuit shown in FIG. 4B, the actual load test circuit (FIG. 4B) has an insulation current that does not exist in the imaginary load test circuit (FIG. 4A). There is a vessel.

この結果、図４Ａでの負担は（電力量計の電流入力回路＋電流線）＝Ｖａであるのに対し、図４Ｂでの負担はこの絶縁変流器の負担Ｖｂが加わるから電流源では電圧（Ｖａ＋Ｖｂ）を発生する必要がある。 As a result, while the burden in FIG. 4A is (current input circuit of watt-hour meter + current line) = V a , the burden in FIG. 4B is the current source because the burden V b of this insulation current transformer is added. Then, it is necessary to generate a voltage (V a + V b ).

これにより、虚負荷試験用の電源を実負荷試験にも使用することができず、新たな電源装置を設置することになる。   As a result, the power source for the imaginary load test cannot be used for the actual load test, and a new power supply device is installed.

本発明は上述の点を考慮してなされたもので、既存の試験用電源を用いて電力量計を実負荷試験し得る試験装置を提供することを目的とする。   The present invention has been made in consideration of the above points, and an object of the present invention is to provide a test apparatus capable of performing an actual load test on a watt hour meter using an existing test power source.

上記目的達成のため、本発明では、
複数の被試験電力量計の電圧端子を電圧源に接続する電圧回路と、絶縁変流器を介して前記被試験電力量計の電流端子を電流源に接続する電流回路とを有し、前記被試験電力量計に電圧、電流を与えて実負荷試験する試験装置において、
前記絶縁変流器に対し前記電流源から供給される電流を検出する電流検出器と、
この電流検出器の検出した電流に応じた補償用電圧信号を形成する電流／電圧変換器と、
前記補償用電圧信号を増幅して前記電流回路に対し前記絶縁変流器のインピーダンスによる電圧降下分を補償するように供給する負性インピーダンス回路と
をそなえたことを特徴とする試験装置、
および
複数の被試験電力量計の電圧端子を電圧源に接続する電圧回路と、絶縁変流器を介して前記被試験電力量計の電流端子を電流源に接続する電流回路とを有し、前記被試験電力量計に電圧、電流を与えて実負荷試験する試験装置において、
前記絶縁変流器に対し前記電流源から供給される電圧を検出する電圧検出器と、
この電圧検出器の検出した電圧信号に基づき補償用電圧信号を形成する電圧／電圧変換器と、
前記補償用電圧信号を増幅して前記電流回路に対し前記絶縁変流器のインピーダンスによる電圧降下分を補償するように供給する負性インピーダンス回路と
をそなえたことを特徴とする試験装置、
を提供する。 In order to achieve the above object, in the present invention,
A voltage circuit for connecting a voltage terminal of a plurality of watt-hour meters to a voltage source, and a current circuit for connecting a current terminal of the watt-hour meter to a current source via an insulation current transformer, In a test device that applies voltage and current to the watt-hour meter under test and performs an actual load test,
A current detector for detecting a current supplied from the current source to the insulation current transformer;
A current / voltage converter that forms a compensation voltage signal according to the current detected by the current detector;
A negative impedance circuit that amplifies the voltage signal for compensation and supplies the current circuit so as to compensate for a voltage drop due to impedance of the insulation current transformer,
And a voltage circuit for connecting the voltage terminals of the plurality of power meters under test to a voltage source, and a current circuit for connecting the current terminals of the power meters under test to a current source via an insulation current transformer, In a test apparatus for performing an actual load test by applying voltage and current to the watt-hour meter to be tested,
A voltage detector for detecting a voltage supplied from the current source to the insulation current transformer;
A voltage / voltage converter that forms a compensation voltage signal based on the voltage signal detected by the voltage detector;
A negative impedance circuit that amplifies the voltage signal for compensation and supplies the current circuit so as to compensate for a voltage drop due to impedance of the insulation current transformer,
I will provide a.

本発明は上述のように、電力量計の試験装置における電流回路に負性インピーダンス回路を設けたため、被試験電力量計を実負荷試験する際に挿入する絶縁変流器の負担を打ち消すことができ、電源を替えることなく虚負荷試験用の試験装置を用いて実負荷試験を実施することができる。   In the present invention, as described above, the negative impedance circuit is provided in the current circuit in the watt-hour test device, so that the load of the insulation current transformer to be inserted when performing the actual load test on the watt-hour meter can be canceled. The actual load test can be carried out using a test apparatus for an imaginary load test without changing the power source.

本発明の基本構成を示す接続図。The connection diagram which shows the basic composition of this invention. 図２Ａは本発明における電流検出型の実施例を示す接続図、図２Ｂは同じく電圧検出型の実施例を示す接続図。FIG. 2A is a connection diagram showing a current detection type embodiment of the present invention, and FIG. 2B is a connection diagram showing a voltage detection type embodiment. 図３Ａは従来の虚負荷試験装置を示す接続図、図３Ｂは従来の実負荷試験装置を示す接続図。FIG. 3A is a connection diagram illustrating a conventional virtual load test apparatus, and FIG. 3B is a connection diagram illustrating a conventional actual load test apparatus. 図４Ａは図３Ａに示した虚負荷試験装置の電流回路を示す概略回路図、図４Ｂは図３Ｂに示した実負荷試験装置の電流回路を示す概略回路図。4A is a schematic circuit diagram showing a current circuit of the imaginary load test apparatus shown in FIG. 3A, and FIG. 4B is a schematic circuit diagram showing a current circuit of the actual load test apparatus shown in FIG. 3B.

以下、図1および図２を参照して本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

基本的構成Basic configuration

図１は、本発明の基本的構成を示す接続図であり、被試験電力量計ＷＨを実負荷試験するための電流回路を示している。この電流回路における被試験電力量計ＷＨは、絶縁変流器ＣＴｉを介して電流源ＣＳに接続される。 FIG. 1 is a connection diagram showing the basic configuration of the present invention, and shows a current circuit for performing an actual load test on a power meter to be tested WH. The power meter under test WH in this current circuit is connected to a current source CS via an insulation current transformer CT i .

ここで、絶縁変流器ＣＴｉで生じる電圧降下分を補償するために、負性インピーダンス回路ＮＩが、電流回路における絶縁変流器ＣＴｉの一次側に直列接続される。 Here, in order to compensate for the voltage drop caused by the isolation current transformer CT i, negative impedance circuit NI is connected in series to the primary side of the insulating current transformer CT i in the current circuit.

負性インピーダンス回路ＮＩは、電流回路を流れる電流ｉまたは電流源ＣＳ両端間に発生する電圧ｖに対応した負性インピーダンスを形成して、絶縁変流器ＣＴｉにおける電圧降下分ＶＬに相当する負の電圧Ｖｒを電流回路に供給する。 The negative impedance circuit NI forms a negative impedance corresponding to the current i flowing through the current circuit or the voltage v generated across the current source CS, and corresponds to the voltage drop VL in the insulation current transformer CT i . A negative voltage Vr is supplied to the current circuit.

これにより、電圧降下分ＶＬは負の電圧Ｖｒによって打ち消されるから、実負荷試験で不可避な絶縁変流器ＣＴｉの使用に起因する負担の増加が補償されて、被試験電力量計を試験することができる。 As a result, the voltage drop V L is canceled out by the negative voltage V r , so that the increase in burden caused by the use of the insulation current transformer CT i unavoidable in the actual load test is compensated, and the watt-hour meter to be tested Can be tested.

図２Ａは、本発明の電流検出型の実施例を示したものである。この実施例では、電流回路に流れる電流ｉを電流検出器ＣＴｄで検出して電流／電圧変換器Ｉ／Ｖに与え、その変換出力である補償用電圧信号ｖｓを、負性インピーダンス回路ＮＩの増幅器ＡＭＰで増幅した上で、出力変圧器ＶＴｏを通すことにより得られる補償電圧Ｖｒとして電流回路に出力する。 FIG. 2A shows a current detection type embodiment of the present invention. In this embodiment, it applied to the current / voltage converter I / V by detecting the current i flowing through the current circuit by the current detector CT d, the voltage signal v s for compensating its conversion output, negative impedance circuit NI And a compensation voltage V r obtained by passing through the output transformer VT o is output to the current circuit.

この補償電圧Ｖｒは、絶縁変流器ＣＴｉにおける電圧降下分ＶLに相当するものである。したがって、実負荷試験で用いられる絶縁変流器ＣＴｉにより生じる負担の増加分が補償される。 This compensation voltage V r corresponds to the voltage drop V L in the insulation current transformer CT i . Therefore, an increase in burden caused by the insulation current transformer CT i used in the actual load test is compensated.

図２Ｂは、本発明の電圧検出型の実施例を示したもので、電流回路における電流源ＣＳの両端間電圧ｖを電圧／電圧変換器Ｖ／Ｖに与え、その変換出力である補償用電圧信号ｖｓを、負性インピーダンス回路ＮＩの増幅器ＡＭＰで増幅した上で、出力変圧器ＶＴｏを通すことにより得られる補償電圧Ｖｒとして電流回路に出力する。 FIG. 2B shows a voltage detection type embodiment of the present invention. A voltage v between both ends of a current source CS in a current circuit is applied to a voltage / voltage converter V / V, and a compensation voltage which is a conversion output thereof is shown. the signal v s, in terms of amplified by the amplifier AMP in the negative impedance circuit NI, and outputs the current circuit as a compensation voltage V r which is obtained by passing the output transformer VT o.

この補償電圧Ｖｒは、絶縁変流器ＣＴｉにおける電圧降下分ＶLに相当するものである。したがって、実負荷試験で用いられる絶縁変流器ＣＴｉにより生じる電圧降下分ＶL、つまり負担の増加分が補償される。 This compensation voltage V r corresponds to the voltage drop V L in the insulation current transformer CT i . Therefore, the voltage drop V L caused by the insulation current transformer CT i used in the actual load test, that is, the increased load is compensated.

ＷＨ 被試験電力量計、ＣＴｉ 絶縁変流器、ＣＳ 電流源、
ＮＩ 負性インピーダンス回路、ＣＴｄ 電流検出器、ＶＴｏ 出力変圧器、
Ｉ／Ｖ 電流／電圧変換器、ＡＭＰ 増幅器、Ｖ／Ｖ 電圧／電圧変換器、
ＳＷ スイッチ、ＶＳ 電圧源。
ｉ 電流回路電流、ｖ 電流源電圧、ＶＬ，Ｖａ 電圧降下分、
Ｖｒ，Ｖｂ 補償電圧、ｖｓ 補償用電圧信号。 WH Energy meter under test, CT i insulation current transformer, CS current source,
NI negative impedance circuit, CT d current detector, VT o output transformer,
I / V current / voltage converter, AMP amplifier, V / V voltage / voltage converter,
SW switch, VS voltage source.
i current circuit current, v current source voltage, V L, V a voltage drop,
V r, V b compensation voltage, v s compensation for voltage signal.

Claims (3)

複数の被試験電力量計の電圧端子を電圧源に接続する電圧回路と、絶縁変流器を介して前記被試験電力量計の電流端子を電流源に接続する電流回路とを有し、前記被試験電力量計に電圧、電流を与えて実負荷試験する試験装置において、
前記絶縁変流器に対し前記電流源から供給される電流を検出する電流検出器と、
この電流検出器の検出した電流に応じた補償用電圧信号を形成する電流／電圧変換器と、
前記補償用電圧信号を増幅して前記電流回路に対し前記絶縁変流器のインピーダンスによる電圧降下分を補償するように供給する負性インピーダンス回路と
をそなえたことを特徴とする試験装置。 A voltage circuit for connecting a voltage terminal of a plurality of watt-hour meters to a voltage source, and a current circuit for connecting a current terminal of the watt-hour meter to a current source via an insulation current transformer, In a test device that applies voltage and current to the watt-hour meter under test and performs an actual load test,
A current detector for detecting a current supplied from the current source to the insulation current transformer;
A current / voltage converter that forms a compensation voltage signal according to the current detected by the current detector;
And a negative impedance circuit that amplifies the compensation voltage signal and supplies the current circuit to compensate for a voltage drop due to the impedance of the insulation current transformer. 複数の被試験電力量計の電圧端子を電圧源に接続する電圧回路と、絶縁変流器を介して前記被試験電力量計の電流端子を電流源に接続する電流回路とを有し、前記被試験電力量計に電圧、電流を与えて実負荷試験する試験装置において、
前記絶縁変流器に対し前記電流源から供給される電圧を検出する電圧検出器と、
この電圧検出器の検出した電圧信号に基づき補償用電圧信号を形成する電圧／電圧変換器と、
前記補償用電圧信号を増幅して前記電流回路に対し前記絶縁変流器のインピーダンスによる電圧降下分を補償するように供給する負性インピーダンス回路と
をそなえたことを特徴とする試験装置。 A voltage circuit for connecting a voltage terminal of a plurality of watt-hour meters to a voltage source, and a current circuit for connecting a current terminal of the watt-hour meter to a current source via an insulation current transformer, In a test device that applies voltage and current to the watt-hour meter under test and performs an actual load test,
A voltage detector for detecting a voltage supplied from the current source to the insulation current transformer;
A voltage / voltage converter that forms a compensation voltage signal based on the voltage signal detected by the voltage detector;
And a negative impedance circuit that amplifies the compensation voltage signal and supplies the current circuit to compensate for a voltage drop due to the impedance of the insulation current transformer. 請求項１または２記載の試験装置において、
前記負性インピーダンス回路は、
前記補償用電圧信号を増幅する増幅器と、
この増幅器の出力を前記電流回路に供給する出力変圧器と
をそなえたことを特徴とする試験装置。 The test apparatus according to claim 1 or 2,
The negative impedance circuit is:
An amplifier for amplifying the compensation voltage signal;
An output transformer for supplying an output of the amplifier to the current circuit.
JP2014165509A 2014-08-15 2014-08-15 Test device for watthour meter Pending JP2016042045A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110907729A (en) * 2019-11-29 2020-03-24 科大智能电气技术有限公司 Power equipment testing method based on active compensation mutual inductor and three-phase source
CN112858986A (en) * 2021-03-02 2021-05-28 中国电力科学研究院有限公司 Current transformer's primary winding leakage current compensating circuit and check-up equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572862A (en) * 1978-11-28 1980-06-02 Toshiba Corp Electronic watt-hour meter
JPH02122609A (en) * 1988-11-01 1990-05-10 Nippon Denki Keiki Kenteishiyo Error compensation type current transformer
JPH04233012A (en) * 1990-12-28 1992-08-21 Nippon Denki Keiki Kenteishiyo Voltage amplifier for phantom loading testing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572862A (en) * 1978-11-28 1980-06-02 Toshiba Corp Electronic watt-hour meter
JPH02122609A (en) * 1988-11-01 1990-05-10 Nippon Denki Keiki Kenteishiyo Error compensation type current transformer
JPH04233012A (en) * 1990-12-28 1992-08-21 Nippon Denki Keiki Kenteishiyo Voltage amplifier for phantom loading testing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110907729A (en) * 2019-11-29 2020-03-24 科大智能电气技术有限公司 Power equipment testing method based on active compensation mutual inductor and three-phase source
CN112858986A (en) * 2021-03-02 2021-05-28 中国电力科学研究院有限公司 Current transformer's primary winding leakage current compensating circuit and check-up equipment

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