JP3010642B2 - Optical system zero-phase current / voltage sensor signal processing circuit - Google Patents
Optical system zero-phase current / voltage sensor signal processing circuitInfo
- Publication number
- JP3010642B2 JP3010642B2 JP1243798A JP24379889A JP3010642B2 JP 3010642 B2 JP3010642 B2 JP 3010642B2 JP 1243798 A JP1243798 A JP 1243798A JP 24379889 A JP24379889 A JP 24379889A JP 3010642 B2 JP3010642 B2 JP 3010642B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- optical fiber
- fiber sensors
- current
- light receiving
- 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 - Fee Related
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、３相交流の各相の電流値又は電圧値の瞬時
和の変化で、任意の相に起きた事故を判別する光方式零
相電流電圧センサ信号処理回路に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical zero-phase current for discriminating an accident occurring in an arbitrary phase by a change in instantaneous sum of current values or voltage values of each phase of three-phase alternating current. The present invention relates to a voltage sensor signal processing circuit.
従来の技術 第３図に従来例の回路構成図を示す。この従来例は、
光ファイバセンサ1,2,3へ光を供給する３個のLED4,5,6
と、これらを駆動する３個の駆動アンプ7,8,9と、光フ
ァイバセンサからの光信号を受光する３個の受光ダイオ
ード10,11,12と、これらの受光ダイオードの信号を増幅
する３個の受光アンプ13,14,15と、これらの受光アンプ
で増幅された信号をディジタル化するA/D変換器16と、
このディジタル信号を演算処理するCPU17と、商用周波
数を基準とするクロック発生器19とから光方式零相電流
電圧センサ信号処理回路を構成している。FIG. 3 shows a circuit diagram of a conventional example. This conventional example,
Three LEDs 4, 5, and 6 that supply light to optical fiber sensors 1, 2, and 3
And three drive amplifiers 7, 8, and 9 for driving them, three light-receiving diodes 10, 11, and 12 for receiving an optical signal from the optical fiber sensor, and an amplifier for amplifying the signals of these light-receiving diodes. Light receiving amplifiers 13, 14, 15; an A / D converter 16 for digitizing a signal amplified by these light receiving amplifiers;
An optical system zero-phase current / voltage sensor signal processing circuit is constituted by the CPU 17 for performing arithmetic processing on the digital signal and the clock generator 19 based on the commercial frequency.
この従来例は、３相交流の周波数を商用周波数50Hz又
は60Hzで固定したものとして、前記A/D変換器16へ変換
トリガーをかけて、前記CPU17が各相の電流値又は電圧
値を検出する。光ファイバセンサ1,2,3からの受光信号
は、センサ間の感度のばらつきや多層の影響により、そ
の３相和は必ずしも零とはならない。このため、この従
来例では、第４図に示す様に、クロック発生器19で取り
込んだ１周期前の波形を基準周波数として零相を求め、
この零相の変化で任意の相に起きた事故を判別するよう
にしている。In this conventional example, assuming that the frequency of the three-phase alternating current is fixed at a commercial frequency of 50 Hz or 60 Hz, a conversion trigger is applied to the A / D converter 16, and the CPU 17 detects a current value or a voltage value of each phase. . The sum of the three phases of the light receiving signals from the optical fiber sensors 1, 2, and 3 is not always zero due to variations in the sensitivity between the sensors and the effect of multiple layers. For this reason, in this conventional example, as shown in FIG. 4, the zero phase is obtained by using the waveform obtained one cycle before by the clock generator 19 as a reference frequency.
An accident occurring in an arbitrary phase is determined based on the change in the zero phase.
即ち、この従来例では、光ファイバセンサ1,2,3から
の受光信号の３相瞬時和である零相値に、前記光ファイ
バセンサ1,2,3の感度ばらつきや多層の影響により、み
かけの零相値が現れるため、これらのみかけの零相値を
除去し、任意の相に起きた事故による真の零相値を検出
すべく、第４図に示す様に一周期前の零相値を基準同期
として、同位置サンプル点データからの差を前記CPU17
で演算処理する。そして、任意の相に起きた事故を検出
するため、第５図に示すアルゴリズムに従い、真の零相
電圧が閾値を越えると、真の零相値を演算処理するため
の基準周期を事故前の一周期に固定する。これは、第４
図に示す様に任意の相に起きた事故による、真の零相値
の変化した周期を基準周期としてしまうと、次周期以降
は零相値が再び零になってしまい、事故検出できなくな
る事を避けるために行なう。That is, in this conventional example, the zero-phase value, which is the three-phase instantaneous sum of the received light signals from the optical fiber sensors 1, 2, and 3, is apparently affected by the sensitivity variation of the optical fiber sensors 1, 2, and 3 and the effect of the multilayer. In order to remove these apparent zero-sequence values and detect the true zero-sequence value due to an accident that occurred in an arbitrary phase, as shown in FIG. Using the value as the reference synchronization, the difference from the
Perform arithmetic processing. When the true zero-phase voltage exceeds the threshold value according to the algorithm shown in FIG. 5 in order to detect an accident that has occurred in an arbitrary phase, the reference period for calculating the true zero-phase value is set to the value before the accident. Fixed to one cycle. This is the fourth
As shown in the figure, if the period in which the true zero-phase value changes due to an accident that occurred in an arbitrary phase is used as the reference period, the zero-phase value will become zero again after the next period, making it impossible to detect an accident. Do to avoid.
発明が解決しようとする課題 しかしながら、零相電圧が閾値を越え、零相電流が閾
値を越えない場合には、第６図示す様に、固定された基
準周期と前記光ファイバセンサ1,2,3から入力された３
検出周期の間での時間差が大きくなる。However, when the zero-phase voltage exceeds the threshold and the zero-phase current does not exceed the threshold, as shown in FIG. 6, a fixed reference period and the optical fiber sensors 1, 2, and 3 entered from 3
The time difference between the detection cycles increases.
また、零相値のサンプル点データはクロック発生器19
により、商用周波数50Hz又は60Hzに固定されているため
基準周期の真の周波数が商用周波数の持つ誤差周波数に
よるサンプル点のずれを含んでしまう。このため、前記
CPU17により、基準周期と検出され比較される周期との
時間差が大きくなる程、前記誤差が蓄積され、第６図に
示す様に真の零相電流が閾値を越えていないにもかかわ
らず、誤差による閾値越えが検出され、事故の誤検出と
なる。この従来例では、これを防止するため、蓄積誤差
による閾値越えを生じる前に、事故検出を停止するよう
にしているが、そのため零相電圧が事故検出閾値越えを
し、零相電流が事故検出閾値越えをしない場合は、長時
間に亘って事故検出ができないという問題がある。The zero-phase value sample point data is supplied to the clock generator 19.
Therefore, since the commercial frequency is fixed to 50 Hz or 60 Hz, the true frequency of the reference cycle includes a shift of the sampling point due to the error frequency of the commercial frequency. For this reason,
As the time difference between the reference cycle and the cycle to be detected and compared by the CPU 17 increases, the error accumulates, and although the true zero-phase current does not exceed the threshold as shown in FIG. Is detected, and an accident is erroneously detected. In this conventional example, in order to prevent this, the fault detection is stopped before the threshold value is exceeded due to the accumulation error.However, the zero-phase voltage exceeds the fault detection threshold value, and the zero-phase current is detected. If the threshold is not exceeded, there is a problem that an accident cannot be detected for a long time.
課題を解決するための手段 上記課題を解決するために、本発明の光方式零相電流
電圧センサ信号処理回路は、位相が120゜毎にずれた３
相交流の各相の電流又は電圧を検出する３個の光ファイ
バセンサと、これらの光ファイバセンサへ光を供給する
３個のLEDと、これらのLEDを駆動する３個の駆動アンプ
と、前記３個の光ファイバセンサからの光信号を受光す
る３個の受光ダイオードと、これらの受光ダイオードの
信号を増幅する３個の受光アンプと、これら３個の受光
アンプで増幅される信号をディジタル化するA/D変換器
と、このディジタル信号を演算処理するCPUとからな
り、前記３個の光ファイバセンサから検出された３相交
流電流値又は電圧値の特定範囲データより前記CPUによ
り３相交流周波数の変動を演算検出し、前記A/D変換器
へ変換トリガーをかけるタイミングを演算結果の増減に
より、サンプルクロックの最小単位分のみ増減させる事
により、CPUで読み取られる光ファイバセンサからの光
信号値を３相交流周波数の変動の影響を受けずにサンプ
ルするように構成したことを特徴とする。Means for Solving the Problems In order to solve the above problems, an optical zero-phase current / voltage sensor signal processing circuit according to the present invention has a phase shift of every 120 °.
Three optical fiber sensors for detecting the current or voltage of each phase of phase alternating current, three LEDs for supplying light to these optical fiber sensors, three drive amplifiers for driving these LEDs, Three light-receiving diodes that receive light signals from three optical fiber sensors, three light-receiving amplifiers that amplify the signals of these light-receiving diodes, and digitization of signals amplified by these three light-receiving amplifiers A / D converter and a CPU for performing arithmetic processing on the digital signal. The CPU uses the three-phase AC based on the specified range data of the three-phase AC current value or voltage value detected from the three optical fiber sensors. By calculating and detecting the fluctuation of the frequency and increasing / decreasing the timing of applying the conversion trigger to the A / D converter by the increase / decrease of the calculation result, only the minimum unit of the sample clock is increased / decreased. Characterized by being configured to sample the light signal value without being affected by variations in the 3-phase alternating current frequency of from Ibasensa.
作用 本発明によれば、商用周波数の誤差を含んだ周波数の
検出を、センサからの電圧値又は電流値の変動で行な
い、サンプルされたデータの精度にかかわらず、周波数
の誤差のずれを最小限に押さえた周波数で、零相値をCP
Uはサンプリングするので、基準周期が商用周波数の誤
差のずれを含まないため、零相電圧が事故検出閾値越え
をし、零相電流が事故検出閾値越えをしない場合も、長
期に亘って事故検出を行なうことができる。According to the present invention, the detection of the frequency including the error of the commercial frequency is performed by the fluctuation of the voltage value or the current value from the sensor, and the deviation of the frequency error is minimized regardless of the accuracy of the sampled data. The zero-phase value at the frequency
Since U is sampled, the reference period does not include the deviation of the commercial frequency error. Can be performed.
実施例 第１図に本発明の一実施例における光方式零相電流電
圧センサ信号処理回路の回路ブロック図を示す。本実施
例の光方式零相電流電圧センサ信号処理回路は、位相が
120゜毎にずれた３相交流の各相の電流又は電圧を検出
する３個の光ファイバセンサ1,2,3と、これらの光ファ
イバセンサ1,2,3へ光を供給する３個のLED4,5,6と、こ
れらのLED4,5.6を駆動する３個の駆動アンプ7,8,9と、
前記光ファイバセンサ1,2,3からの光信号を受光する３
個の受光ダイオード10,11,12と、これらの受光ダイオー
ド10,11,12の信号を増幅する３個の受光アンプ13,14,15
と、これらから入力される信号をディジタル化するA/D
変換器16と、ディジタル化された信号値を演算処理する
CPU17とで構成されており、CPU17は入力された電流値又
は電圧値データの変動により、前記３相交流周波数を求
める。そして、この周波数が、第２図に示す様に、前３
周期間で求められた平均周波数より大きい場合は、CPU1
7の最小カウントクロック値分だけ小さくする。又、平
均周波数が小さい場合は、前記最小カウントクロック値
分だけ大きくする。これらの判別により決定されたカウ
ントクロック値により前記A/D変換器16へ変換トリガー
をかける。Embodiment FIG. 1 shows a circuit block diagram of an optical system zero-phase current / voltage sensor signal processing circuit according to an embodiment of the present invention. The optical system zero-phase current / voltage sensor signal processing circuit of this embodiment has a phase
Three optical fiber sensors 1, 2, 3 for detecting the current or voltage of each phase of the three-phase alternating current shifted by 120 °, and three optical fiber sensors 1, 2, 3 for supplying light to these optical fiber sensors 1, 2, 3 LEDs 4, 5, 6 and three drive amplifiers 7, 8, 9 for driving these LEDs 4, 5.6,
3 for receiving optical signals from the optical fiber sensors 1, 2, and 3
Light receiving diodes 10, 11, 12 and three light receiving amplifiers 13, 14, 15 for amplifying the signals of these light receiving diodes 10, 11, 12
And A / D that digitizes the signals input from these
The converter 16 processes the digitized signal values.
The CPU 17 obtains the three-phase AC frequency based on a change in input current value or voltage value data. Then, as shown in FIG.
If it is higher than the average frequency obtained between cycles, CPU1
Decrease by 7 for the minimum count clock value. If the average frequency is small, the average frequency is increased by the minimum count clock value. A conversion trigger is applied to the A / D converter 16 based on the count clock value determined by these determinations.
この方式により、A/D変換器16により求められた周波
数を使用して、商用周波数が誤差を含むことによる基準
周期と検出中の周期の時間差が大きい場合も、前述誤差
の蓄積がなくなるため、長時間の事故検出かできる。With this method, using the frequency obtained by the A / D converter 16, even when the time difference between the reference period and the period being detected due to the commercial frequency containing an error is large, the accumulation of the error is eliminated. Can detect long-term accidents.
発明の効果 本発明は上記構成、作用を有するので、零相電圧が事
故検出閾値を越え、零相電流が事故検出閾値を越えない
場合に、長時間に亘って事故検出を行う事ができる。Effects of the Invention Since the present invention has the above-described configuration and operation, when the zero-phase voltage exceeds the fault detection threshold and the zero-phase current does not exceed the fault detection threshold, fault detection can be performed for a long time.
第１図は本発明の一実施例における光方式零相電流電圧
センサ信号処理回路を示すブロック図、第２図は第１図
に示す実施例において事故検出を行なう波形図、第３図
は従来例を示す回路ブロック図、第４図は第３図に示す
従来例の事故検出を行う波形図、第５図は従来例におけ
る事故判別概略を示すフローチャート、第６図は従来例
における事故検出を誤判断する波形図である。 1,2,3……光ファイバセンサ、4,5,6……LED、7,8,9……
駆動アンプ、10,11,12……受光ダイオード、13,14,15…
…受光アンプ、16……A/D変換器、17……CPU、FIG. 1 is a block diagram showing an optical system zero-phase current / voltage sensor signal processing circuit in one embodiment of the present invention, FIG. 2 is a waveform diagram for detecting an accident in the embodiment shown in FIG. 1, and FIG. FIG. 4 is a waveform diagram for detecting an accident in the conventional example shown in FIG. 3, FIG. 5 is a flowchart showing an outline of accident determination in the conventional example, and FIG. FIG. 6 is a waveform diagram for erroneously determining. 1,2,3 …… Optical fiber sensor, 4,5,6 …… LED, 7,8,9 ……
Driving amplifier, 10,11,12 ... Light receiving diode, 13,14,15 ...
... receiver amplifier, 16 ... A / D converter, 17 ... CPU,
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−316673（ＪＰ，Ａ) 特開 平２−240574（ＪＰ，Ａ) 特開 昭63−40867（ＪＰ，Ａ) 特開 昭62−200269（ＪＰ，Ａ) 特開 昭62−200268（ＪＰ，Ａ) 特開 平２−96668（ＪＰ，Ａ) 実開 平１−138108（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 19/00 - 19/32 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-316673 (JP, A) JP-A-2-240574 (JP, A) JP-A-63-40867 (JP, A) JP-A-62 200269 (JP, A) JP-A-62-200268 (JP, A) JP-A-2-96668 (JP, A) JP-A-1-138108 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G01R 19/00-19/32
Claims (1)
電流又は電圧を検出する３個の光ファイバセンサと、こ
れらの光ファイバセンサへ光を供給する３個のLEDと、
これらのLEDを駆動する３個の駆動アンプと、前記３個
の光ファイバセンサからの光信号を受光する３個の受光
ダイオードと、これらの受光ダイオードの信号を増幅す
る３個の受光アンプと、これら３個の受光アンプで増幅
される信号をディジタル化するA/D変換器と、このディ
ジタル信号を演算処理するCPUとからなり、前記３個の
光ファイバセンサから検出された３相交流電流値又は電
圧値の特定範囲データより前記CPUにより３相交流周波
数の変動を演算検出し、前記A/D変換器へ変換トリガー
をかけるタイミングを演算結果の増減により、サンプル
クロックの最小単位分のみ増減させる事により、CPUで
読み取られる光ファイバセンサからの光信号値を３相交
流周波数の変動の影響を受けずにサンプルするように構
成したことを特徴とする光方式零相電流電圧センサ信号
処理回路。1. Three optical fiber sensors for detecting the current or voltage of each phase of a three-phase alternating current whose phase is shifted by 120 °, three LEDs for supplying light to these optical fiber sensors,
Three drive amplifiers for driving these LEDs, three light receiving diodes for receiving light signals from the three optical fiber sensors, and three light receiving amplifiers for amplifying the signals of these light receiving diodes; An A / D converter for digitizing signals amplified by these three light receiving amplifiers, and a CPU for arithmetically processing the digital signals, and a three-phase AC current value detected from the three optical fiber sensors Alternatively, the CPU calculates and detects a change in the three-phase AC frequency from the specific range data of the voltage value, and increases / decreases the timing at which the conversion trigger is applied to the A / D converter by only the minimum unit of the sample clock by increasing / decreasing the calculation result. The optical system characterized in that the optical signal value from the optical fiber sensor read by the CPU is sampled without being affected by the fluctuation of the three-phase AC frequency. Phase current voltage sensor signal processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1243798A JP3010642B2 (en) | 1989-09-20 | 1989-09-20 | Optical system zero-phase current / voltage sensor signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1243798A JP3010642B2 (en) | 1989-09-20 | 1989-09-20 | Optical system zero-phase current / voltage sensor signal processing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03105261A JPH03105261A (en) | 1991-05-02 |
| JP3010642B2 true JP3010642B2 (en) | 2000-02-21 |
Family
ID=17109106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1243798A Expired - Fee Related JP3010642B2 (en) | 1989-09-20 | 1989-09-20 | Optical system zero-phase current / voltage sensor signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3010642B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378462C (en) * | 2003-09-09 | 2008-04-02 | 武汉大学 | Multiphase digital synchronously sampling photoelectric current mutual inductor |
-
1989
- 1989-09-20 JP JP1243798A patent/JP3010642B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03105261A (en) | 1991-05-02 |
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