JP2002139524A - Voltage detection device - Google Patents
Voltage detection deviceInfo
- Publication number
- JP2002139524A JP2002139524A JP2000335408A JP2000335408A JP2002139524A JP 2002139524 A JP2002139524 A JP 2002139524A JP 2000335408 A JP2000335408 A JP 2000335408A JP 2000335408 A JP2000335408 A JP 2000335408A JP 2002139524 A JP2002139524 A JP 2002139524A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- impedance
- detection
- voltage detection
- detection device
- 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
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電力系統や電気機
器の電圧検出装置に係り、特に多相ラインでの線間電圧
検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage detecting device for a power system or an electric device, and more particularly to a line voltage detecting device for a polyphase line.
【０００２】[0002]
【従来の技術】この種の電圧検出装置は、例えば、配電
系統や電気機器の保護継電器における電源ラインの電圧
検出器として設けられたり、三相インバータの負荷電圧
検出手段として設けられる。2. Description of the Related Art This type of voltage detecting device is provided, for example, as a voltage detector of a power supply line in a distribution relay or a protective relay of an electric device, or as a load voltage detecting means of a three-phase inverter.
【０００３】これら電圧検出装置は、検出機能部分のイ
ンピーダンスを高くしておき、定常時の電源ラインや計
器用変圧器にかける負担（負荷）を軽減している。特
に、ディジタル形保護継電システムなど、小型化と微小
電流を取り扱う装置では電圧検出装置の負荷インピーダ
ンスを高くしている。[0003] In these voltage detection devices, the impedance of the detection function portion is increased to reduce the load (load) applied to the power supply line and the instrument transformer during normal operation. In particular, in a device that handles miniaturization and a small current, such as a digital protection relay system, the load impedance of the voltage detection device is increased.
【０００４】[0004]
【発明が解決しようとする課題】従来の電圧検出装置で
は、測定対象系統（計器用変圧器回路も含む）の１線に
断線が発生すると、他の相の計器や継電器等により電圧
の回り込みが起き、検出相の電圧を正確に検出できない
ばかりか、不足電圧検出等の機能も発揮できない場合が
ある。In the conventional voltage detecting device, when one line of the system to be measured (including the transformer circuit for the instrument) is broken, the voltage is wrapped around by a meter or relay of another phase. In some cases, not only cannot the voltage of the detection phase be accurately detected, but also the function of detecting an undervoltage cannot be exhibited.
【０００５】例えば、図２では、ＲＳＴ三相のうち、電
圧検出装置１はＲＳ相の線間電圧を検出するにおいて、
ＲＴ相間に他の計測装置２が接続されている場合、Ｒ相
が断線すると、電圧検出装置１はＲＳ間の電圧０として
検出すべきである。しかし、ＲＴ相間の計測装置２を通
してＴ相電圧がＣ点からＡ点に印加され、電圧検出装置
１がＡ’点とＢ点に接続されるため、その検出電圧は、[0005] For example, in FIG. 2, among the three RST phases, the voltage detecting device 1 detects the RS-phase line voltage.
When another measuring device 2 is connected between the RT phases, if the R phase is broken, the voltage detecting device 1 should detect the voltage as 0 between the RS. However, since the T-phase voltage is applied from the point C to the point A through the measuring device 2 between the RT phases, and the voltage detecting device 1 is connected to the points A ′ and B, the detected voltage is
【０００６】[0006]
【数１】ＶST＊Ｘ／（Ｘ＋Ｚ） となる。ただし、ＶＳＴはＳＴ間の電圧、Ｘは電圧検出
装置のインピーダンス、ＺはＲＴ相間の計測装置インピ
ーダンスである。## EQU1 ## V ST * X / (X + Z) Here, VST is the voltage between STs, X is the impedance of the voltage detection device, and Z is the measurement device impedance between the RT phases.
【０００７】以上のように、電圧検出装置のインピーダ
ンスがＲＴ相間のインピーダンスに比較して大きいとき
は検出電圧がＶSTの値に近づくことになり、電圧検出装
置の不動作、誤動作を招くことになる。[0007] As described above, when the impedance of the voltage detecting device is large compared to the impedance of the RT phase will be detected voltage approaches the value of V ST, non operation of the voltage detection device, to cause a malfunction Become.
【０００８】本発明の目的は、電圧検出対象ラインに接
続される他の装置の影響を受けることなく確実に電圧検
出できる電圧検出装置を提供することにある。An object of the present invention is to provide a voltage detection device capable of reliably detecting a voltage without being affected by another device connected to a voltage detection target line.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記の課題を
解決するため、電圧が急変したときに電圧検出装置の入
力インピーダンスを下げ、他の計測装置などがもつイン
ピーダンスを通した電圧の回り込みにも検出電圧への影
響を取り除くことができるようにしたもので、以下の構
成を特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention lowers the input impedance of a voltage detecting device when the voltage suddenly changes, and wraps around the voltage through the impedance of other measuring devices. Also, it is possible to remove the influence on the detection voltage, and it is characterized by the following configuration.
【００１０】電圧検出対象ラインに他の装置と共に接続
され、該ラインの相間電圧を検出する電圧検出装置であ
って、前記ラインに接続された入力電圧が一定値以上に
変化したことを検出する検出手段と、前記検出手段の検
出信号によって前記他の装置がもつ入力インピーダンス
による電圧回り込みの影響を少なくする入力インピーダ
ンスを検出入力回路に挿入する手段とを備えたことを特
徴とする。A voltage detecting device connected to a voltage detection target line together with another device to detect an inter-phase voltage of the line, the detection device detecting that an input voltage connected to the line has changed to a predetermined value or more. And a means for inserting an input impedance into a detection input circuit for reducing an influence of a voltage sneak caused by an input impedance of the other device according to a detection signal of the detection means.
【００１１】[0011]
【発明の実施の形態】図１は、本発明の実施形態を示す
回路構成図である。同図が図２と異なる部分は、電圧検
出装置１にインピーダンス切換機能を設けた点にある。FIG. 1 is a circuit diagram showing an embodiment of the present invention. 2 differs from FIG. 2 in that the voltage detection device 1 is provided with an impedance switching function.
【００１２】電圧検出装置１は、インピーダンスＸをも
つ絶縁トランス３によって電圧波形を取り込み、電圧検
出回路４によって電圧検出する。ここで、絶縁トランス
３の一次側には並列に常開接点Ｙとインピーダンス切換
用抵抗Ｒの直列回路を設け、接点Ｙは検出回路４が検出
電圧が所定レベル以上変化したことを検出したときに閉
じる構成とする。The voltage detecting device 1 captures a voltage waveform by an insulating transformer 3 having an impedance X, and detects a voltage by a voltage detecting circuit 4. Here, a serial circuit of a normally open contact Y and an impedance switching resistor R is provided in parallel on the primary side of the insulating transformer 3, and the contact Y is connected when the detection circuit 4 detects that the detection voltage has changed by a predetermined level or more. Close the structure.
【００１３】これにより、例えば、Ｒ相に断線が発生
し、ＲＳ相間の電圧が変化したときに電圧検出装置１が
自身で接点Ｙを閉じ、その入力インピーダンスを低下さ
せ、他の相の計測装置２のインピーダンスを通した電圧
の回り込みによる誤動作等を防止する。これを以下に詳
細に説明する。Thus, for example, when a disconnection occurs in the R phase and the voltage between the RS phases changes, the voltage detection device 1 closes the contact Y by itself, lowers the input impedance thereof, and measures the other phases. 2 prevents erroneous operation due to sneak of voltage through impedance. This will be described in detail below.
【００１４】図１において、検出対象系統が健全な場合
には、系統のインピーダンスが十分に低いため、他の計
測装置２のインピーダンスの存在にも電圧検出装置１に
はＲＳ相間の電圧がそのまま検出される。In FIG. 1, when the system to be detected is sound, the impedance of the system is sufficiently low, so that the voltage between the RS phases is directly detected by the voltage detecting device 1 even when the impedance of the other measuring device 2 exists. Is done.
【００１５】系統に断線が発生すると、ＲＴ相間の計測
装置２を通してＴ相電圧がＣ点からＡ点に印加される。
電圧検出装置１は、Ａ’点とＢ点に接続されているた
め、その検出電圧は、When a disconnection occurs in the system, a T-phase voltage is applied from point C to point A through the measuring device 2 between the RT phases.
Since the voltage detection device 1 is connected to the points A ′ and B, the detection voltage is
【００１６】[0016]
【数２】ＶST＊Ｘ／（Ｘ＋Ｚ） となる。ただし、ＶSTはＳＴ間の電圧、Ｘは電圧検出装
置のインピーダンス、ＺはＲＴ相間の計測装置インピー
ダンスである。## EQU2 ## V ST * X / (X + Z) Here, V ST is the voltage between ST , X is the impedance of the voltage detection device, and Z is the measurement device impedance between the RT phases.
【００１７】次に、電圧検出装置１内で断線時に検出さ
れる電圧変動ΔＶは、Next, the voltage fluctuation ΔV detected at the time of disconnection in the voltage detector 1 is:
【００１８】[0018]
【数３】ΔＶ＝電圧変化前の電圧値−電圧変化後の電圧
値 となる。この電圧変化ΔＶが一定量を越えたとき、電圧
検出装置１は接点Ｙを閉じ、抵抗ＲをＲＳ相間に挿入す
る。このとき、抵抗ＲをＲＴ相間のインピーダンスＺに
比べ十分に小さいものとしておくことにより、電圧検出
装置１の分担電圧が小さくなる。なお、断線でなく、系
統電圧が下がった場合は、電圧検出装置に印加される電
圧はあくまでもＲＳ相間の電圧であり、負担Ｒを挿入す
るも電圧が下がることはない。ΔV = voltage value before voltage change−voltage value after voltage change When the voltage change ΔV exceeds a certain amount, the voltage detection device 1 closes the contact Y and inserts the resistor R between the RS phases. At this time, by setting the resistance R sufficiently smaller than the impedance Z between the RT phases, the shared voltage of the voltage detection device 1 is reduced. In the case where the system voltage is lowered instead of the disconnection, the voltage applied to the voltage detection device is a voltage between the RS phases to the last, and the voltage does not decrease even if the load R is inserted.
【００１９】電圧検出装置１における実際の電圧検出信
号の発生は、負担（抵抗）Ｒの挿入時の電圧変動ΔＶを
演算する。The generation of the actual voltage detection signal in the voltage detection device 1 calculates the voltage fluctuation ΔV when the burden (resistance) R is inserted.
【００２０】[0020]
【数４】ΔＶ1＝急変前の電圧値（または負担挿入前の
電圧）−負担挿入後の電圧 この演算を基に、負担Ｒを挿入することにより、ΔＶ1
が大きくなった場合、又は一定値を越えた場合を断線と
して検出する。ΔV 1 = voltage value before sudden change (or voltage before burden insertion) −voltage after burden insertion Based on this calculation, by inserting burden R, ΔV 1
Is detected as a disconnection when the value of 大 き く increases or exceeds a certain value.
【００２１】また、ＲＴ相間に他の計測装置が無い場合
は、タミー抵抗を挿入する。すなわち、ＲＴ相間に他の
計測装置等のインピーダンス要素が接続されない場合
は、Ｔ相電圧が電圧検出装置に回り込まないため、ＲＳ
相間の電圧が検出できるとしてタミー抵抗は挿入しな
い。If there is no other measuring device between the RT phases, a Tammy resistor is inserted. That is, when no impedance element such as another measurement device is connected between the RT phases, the T-phase voltage does not sneak into the voltage detection device.
No Tammy resistor is inserted because the voltage between phases can be detected.
【００２２】なお、実施形態の回路構成において、接点
Ｙは他の半導体スイッチとすること、負担Ｒはインピー
ダンス回路要素とすることなど、適宜設計変更して同等
の作用効果を得ることができる。In the circuit configuration of the embodiment, the same effect can be obtained by appropriately changing the design such that the contact Y is another semiconductor switch and the burden R is an impedance circuit element.
【００２３】[0023]
【発明の効果】以上のとおり、本発明によれば、電圧が
急変したときに電圧検出装置の入力インピーダンスを下
げ、他の計測装置などがもつインピーダンスを通した電
圧の回り込みにも検出電圧への影響を取り除くことがで
きるようにしたため、検出対象系統に接続される他の装
置の影響を受けることなく確実に電圧検出できる。As described above, according to the present invention, when the voltage suddenly changes, the input impedance of the voltage detection device is lowered, and the sneak of the voltage through the impedance of another measurement device or the like is reduced. Since the influence can be removed, the voltage can be reliably detected without being affected by other devices connected to the detection target system.
【図１】本発明の実施形態を示す装置構成図。FIG. 1 is an apparatus configuration diagram showing an embodiment of the present invention.
【図２】従来の装置構成図。FIG. 2 is a configuration diagram of a conventional apparatus.
１…電圧検出装置 ２…他の計測装置 ３…絶縁トランス ４…電圧検出回路 Ｙ…接点 Ｒ…インピーダンス切換用抵抗 DESCRIPTION OF SYMBOLS 1 ... Voltage detection device 2 ... Other measuring device 3 ... Insulation transformer 4 ... Voltage detection circuit Y ... Contact R ... Impedance switching resistance
Claims (1)
続され、該ラインの相間電圧を検出する電圧検出装置で
あって、 前記ラインに接続された入力電圧が一定値以上に変化し
たことを検出する検出手段と、 前記検出手段の検出信号によって前記他の装置がもつ入
力インピーダンスによる電圧回り込みの影響を少なくす
る入力インピーダンスを検出入力回路に挿入する手段と
を備えたことを特徴とする電圧検出装置。1. A voltage detection device connected to a voltage detection target line together with another device to detect an inter-phase voltage of the line, wherein the voltage detection device detects that an input voltage connected to the line has changed to a predetermined value or more. And a means for inserting into the detection input circuit an input impedance that reduces the influence of voltage sneak by the input impedance of the other device based on the detection signal of the detection means. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000335408A JP4238474B2 (en) | 2000-11-02 | 2000-11-02 | Voltage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000335408A JP4238474B2 (en) | 2000-11-02 | 2000-11-02 | Voltage detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002139524A true JP2002139524A (en) | 2002-05-17 |
| JP4238474B2 JP4238474B2 (en) | 2009-03-18 |
Family
ID=18811161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000335408A Expired - Fee Related JP4238474B2 (en) | 2000-11-02 | 2000-11-02 | Voltage detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4238474B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004023548A1 (en) * | 2002-09-02 | 2004-03-18 | Tokyo Electron Limited | Probing method and probe |
| JP7323245B1 (en) * | 2023-04-07 | 2023-08-08 | エクセン株式会社 | Disconnection detector |
-
2000
- 2000-11-02 JP JP2000335408A patent/JP4238474B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004023548A1 (en) * | 2002-09-02 | 2004-03-18 | Tokyo Electron Limited | Probing method and probe |
| JP7323245B1 (en) * | 2023-04-07 | 2023-08-08 | エクセン株式会社 | Disconnection detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4238474B2 (en) | 2009-03-18 |
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