JP2009229184A - Harmonic probing method and device - Google Patents

Harmonic probing method and device Download PDF

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JP2009229184A
JP2009229184A JP2008073640A JP2008073640A JP2009229184A JP 2009229184 A JP2009229184 A JP 2009229184A JP 2008073640 A JP2008073640 A JP 2008073640A JP 2008073640 A JP2008073640 A JP 2008073640A JP 2009229184 A JP2009229184 A JP 2009229184A
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harmonic
order component
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harmonic order
voltage
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Koichi Shinozaki
孝一 篠崎
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Kansai Electric Power Co Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

<P>PROBLEM TO BE SOLVED: To correctly identify the directionality of a harmonic source causing abnormal noises generating from an electric power capacitor by a simple means. <P>SOLUTION: The harmonic probing device comprises: a gauge voltage transformer 5 and a gauge current transformer 6 to measure voltage and current at a distribution line 1 of a power system; and a harmonic meter 7 to extract a voltage harmonic order component and a current harmonic order component based on the gauge voltage transformer 5 and the gauge current transformer 6. The device identifies the direction of the harmonic source of abnormal noises generating from the electric power capacitor 4 in a power receiving facility 2 provided at the distribution line 1 is by determining a tidal current direction of the harmonic order component from the phase difference between the voltage harmonic order component and the current harmonic order component. The device is equipped with a microphone 8 to detect abnormal noises generating at the electric power capacitor 4, the harmonic order component of abnormal noises obtained by the microphone 8 is extracted by the harmonic meter 7, and the voltage harmonic order component and the current harmonic order component corresponding to the harmonic order component of abnormal noises are identified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電力系統の配電線に設けられた受電設備内の電力用コンデンサで発生する異音の高調波発生源の方向性を特定する高調波探査方法および高調波探査装置に関する。   The present invention relates to a harmonic exploration method and a harmonic exploration apparatus for specifying the direction of an abnormal harmonic generation source generated by a power capacitor in a power receiving facility provided in a distribution line of a power system.

近年、電力系統の配電線に接続された電力需要家が使用する負荷には、インバータ回路などのスイッチング動作を行うものが多く、これら負荷の作動によって、配電線における電圧および電流に歪みが生じる。この電圧および電流の歪みは高調波成分であり、この高調波成分が電力需要家で使用される進相コンデンサの破壊などの種々の弊害を引き起こしている。   In recent years, many loads used by power consumers connected to distribution lines of a power system perform switching operations such as inverter circuits, and the operation of these loads causes distortions in voltage and current in the distribution lines. The distortion of the voltage and current is a harmonic component, and this harmonic component causes various adverse effects such as destruction of a phase advance capacitor used in a power consumer.

そのため、高調波成分を発生させている負荷、つまり高調波発生源を探査する必要があり、従来、高調波発生源を探査する方法や装置が種々提案されている（例えば、特許文献１〜４）。   Therefore, it is necessary to search for a load generating a harmonic component, that is, a harmonic generation source, and various methods and apparatuses for searching for a harmonic generation source have been conventionally proposed (for example, Patent Documents 1 to 4). ).

これら特許文献１〜４のいずれも、電力系統の配電線における電圧および電流を測定し、その電圧の高調波次数成分と電流の高調波次数成分とを抽出して電圧の高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定することにより、高調波発生源の方向性を特定するようにしている。   In any of these Patent Documents 1 to 4, the voltage and current in the distribution lines of the power system are measured, and the harmonic order component of the voltage and the harmonic order component of the current are extracted to extract the harmonic order component and current of the voltage. The directionality of the harmonic generation source is specified by determining the flow direction of the harmonic order component from the phase difference of the harmonic order component.

このようにして高調波次数成分の潮流方向が判明すれば、この潮流方向を逆行しながら適宜の箇所で、再度、電圧の高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定する。この電圧高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定する作業をその潮流方向に対して逆行しながら繰り返すことにより、高調波発生源を探査するようにしている。
特開平７−１０４０２２号公報 特開平７−１１０３５３号公報 特開平１０−１４２２７０号公報 特開２００２−４８８２７号公報 Once the direction of the harmonic order component is determined in this way, the phase difference between the harmonic order component of the voltage and the harmonic order component of the current is again determined at an appropriate location while reversing the direction of the current flow. Determine the tidal direction of the wave order component. Exploring harmonic sources by repeating the process of determining the current direction of the harmonic order component from the phase difference between the voltage harmonic order component and the current harmonic order component while reversing the current direction. Like to do.
JP 7-104022 A Japanese Patent Laid-Open No. 7-110353 Japanese Patent Laid-Open No. 10-142270 JP 2002-48827 A

ところで、前述した特許文献１〜４に開示された高調波探査方法および高調波探査装置では、電力系統の配電線における電圧および電流を測定し、その電圧の高調波次数成分と電流の高調波次数成分とを抽出して電圧の高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定することにより、高調波発生源の方向性を特定するようにしている。   By the way, in the harmonic exploration method and the harmonic exploration device disclosed in Patent Documents 1 to 4 described above, the voltage and current in the distribution line of the power system are measured, and the harmonic order component of the voltage and the harmonic order of the current are measured. The direction of the harmonic generation source is specified by extracting the component and determining the direction of power flow of the harmonic order component from the phase difference between the harmonic order component of the voltage and the harmonic order component of the current. ing.

一方、電力系統の配電線に接続された受電設備には電力用コンデンサが設置されていることがあり、この電力用コンデンサが高調波障害により異音を発生する場合がある。この電力用コンデンサに異音を発生させる高調波発生源を探査する場合も、前述したように、電力系統の配電線における電圧および電流を測定し、その電圧の高調波次数成分と電流の高調波次数成分とを抽出して電圧の高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定することにより、異音を発生させる高調波発生源の方向性を特定するようにしている。   On the other hand, a power capacitor may be installed in a power receiving facility connected to a power distribution line, and this power capacitor may generate noise due to harmonic interference. When searching for a harmonic generation source that generates abnormal noise in this power capacitor, as described above, measure the voltage and current in the distribution lines of the power system, and determine the harmonic order component of the voltage and the harmonics of the current. The direction of the harmonic source that generates abnormal noise by extracting the order component and determining the flow direction of the harmonic order component from the phase difference between the harmonic order component of the voltage and the harmonic order component of the current I try to identify gender.

しかしながら、電圧の高調波次数成分と電流の高調波次数成分とを抽出した測定結果には、多くの高調波次数成分が含まれていることから、どの高調波次数成分が電力用コンデンサから発生する異音の原因となっているかを判定することが困難であった。その結果、誤った高調波次数成分の潮流方向を判定することにより、異音を発生させる高調波発生源の方向性を正しく特定することが非常に難しいという問題があった。   However, the measurement results obtained by extracting the harmonic order component of the voltage and the harmonic order component of the current include many harmonic order components, so which harmonic order components are generated from the power capacitor. It was difficult to determine whether the noise was the cause. As a result, there is a problem that it is very difficult to correctly specify the directionality of the harmonic generation source that generates abnormal noise by determining the flow direction of the wrong harmonic order component.

そこで、本発明は、前述の問題点に鑑みて提案されたもので、その目的とするところは、簡易な手段により、電力用コンデンサから発生する異音の原因となっている高調波発生源の方向性を正しく特定し得る高調波探査方法および高調波探査装置を提供することにある。   Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide a harmonic generation source that causes abnormal noise generated from a power capacitor by simple means. It is an object of the present invention to provide a harmonic exploration method and a harmonic exploration apparatus that can correctly specify directionality.

前述の目的を達成するための技術的手段として、本発明に係る高調波探査方法は、電力系統の配電線における電圧および電流を測定してその電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定することにより、配電線に設けられた受電設備内の電力用コンデンサで発生する異音の高調波発生源の方向性を特定するに際して、電力用コンデンサで発生する異音を検出してその異音の高調波次数成分を抽出し、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定することを特徴とする。   As a technical means for achieving the above-mentioned object, the harmonic exploration method according to the present invention measures a voltage and a current in a distribution line of a power system, and determines a harmonic order component of the voltage and a harmonic order component of the current. When determining the directionality of the harmonic generation source of abnormal noise generated by the power capacitor in the power receiving facility provided on the distribution line, by determining the flow direction of the harmonic order component from the phase difference between Detects abnormal noise generated in the power capacitor, extracts the harmonic order component of the abnormal noise, and identifies the harmonic order component of the voltage and the harmonic order component of the current corresponding to the harmonic order component of the abnormal noise It is characterized by doing.

また、本発明に係る高調波探査装置は、電力系統の配電線における電圧および電流を測定する計器用変圧器および計器用変流器と、計器用変圧器および計器用変流器の出力に基づいて電圧の高調波次数成分と電流の高調波次数成分を抽出する高調波測定器とを備え、電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定することにより、配電線に設けられた受電設備内の電力用コンデンサで発生する異音の高調波発生源の方向性を特定するものであって、電力用コンデンサで発生する異音を検出する音響センサを備え、その音響センサにより得られた異音の高調波次数成分を高調波測定器で抽出し、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定することを特徴とする。ここで、「音響センサ」とは、電力用コンデンサで発生する異音を電気信号に変換する手段であり、例えばマイクロフォンの他に、振動センサや加速度センサなどを含む。   Further, the harmonic exploration device according to the present invention is based on an output of an instrument transformer and an instrument current transformer for measuring voltage and current in a distribution line of an electric power system, and an output of the instrument transformer and the instrument current transformer. A harmonic measuring device that extracts the harmonic order component of the voltage and the harmonic order component of the current, and from the phase difference between the harmonic order component of the voltage and the harmonic order component of the current, By determining the direction of power flow, the direction of abnormal harmonics generated by the power capacitor in the power receiving facility installed on the distribution line is specified, and the noise generated by the power capacitor The harmonic order component of the abnormal noise obtained by the acoustic sensor is extracted by a harmonic measuring instrument, and the harmonic order component of the voltage and the current corresponding to the harmonic order component of the abnormal noise are extracted. Identify harmonic order components The features. Here, the “acoustic sensor” is means for converting an abnormal sound generated by the power capacitor into an electric signal, and includes, for example, a vibration sensor and an acceleration sensor in addition to the microphone.

本発明では、電力用コンデンサで発生する異音を音響センサにより検出することにより電気信号に変換する。この異音の電気信号に基づいて高調波測定器により異音の高調波次数成分を抽出する。一方、この高調波測定器では、配電線における電圧の高調波次数成分と電流の高調波次数成分を抽出する。そして、異音の高調波次数成分と、電圧の高調波次数成分および電流の高調波次数成分とを比較し、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定する。その特定された電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定する。これにより、電力用コンデンサで発生する異音の高調波発生源の方向性を正しく特定することができる。   In the present invention, an abnormal sound generated by the power capacitor is detected by an acoustic sensor and converted into an electric signal. The harmonic order component of the abnormal sound is extracted by the harmonic measuring device based on the abnormal electric signal. On the other hand, this harmonic measuring device extracts the harmonic order component of the voltage and the harmonic order component of the current in the distribution line. Then, the harmonic order component of the abnormal noise is compared with the harmonic order component of the voltage and the harmonic order component of the current, and the harmonic order component of the voltage and the harmonic of the current corresponding to the harmonic order component of the abnormal noise are compared. Specify the order component. From the phase difference between the harmonic order component of the specified voltage and the harmonic order component of the current, the flow direction of the harmonic order component is determined. Thereby, the directionality of the harmonic generation source of the abnormal noise generated in the power capacitor can be correctly specified.

本発明の高調波探査装置においては、音響センサにより検出された信号から電力用コンデンサ周辺で発生した雑音を除去し、電力用コンデンサで発生する異音のみを抽出する可変フィルタ部が内蔵された探査用測定器を、音響センサの後段に設けた構成とすることが望ましい。このようにすれば、電力用コンデンサで発生する異音の高調波次数成分のみを正確に抽出することができ、異音の高調波次数成分と、電圧の高調波次数成分および電流の高調波次数成分との比較が容易となる。その結果、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定し易くなり、異音による高調波次数成分の潮流方向を正確に判定できる。これにより、電力用コンデンサで発生する異音の高調波発生源の方向性を特定する上で信頼性の向上が図れる。   In the harmonic exploration device of the present invention, the exploration with a built-in variable filter that removes noise generated around the power capacitor from the signal detected by the acoustic sensor and extracts only the abnormal noise generated by the power capacitor. It is desirable that the measuring instrument is provided in the subsequent stage of the acoustic sensor. In this way, it is possible to accurately extract only the harmonic order component of the abnormal noise generated in the power capacitor, the harmonic order component of the abnormal noise, the harmonic order component of the voltage, and the harmonic order of the current. Comparison with the components becomes easy. As a result, it becomes easy to specify the harmonic order component of the voltage and the harmonic order component of the current corresponding to the harmonic order component of the abnormal sound, and the flow direction of the harmonic order component due to the abnormal sound can be accurately determined. Thereby, it is possible to improve the reliability in identifying the directionality of the harmonic generation source of the abnormal noise generated in the power capacitor.

本発明では、電力用コンデンサで発生する異音を音響センサにより検出してその異音の高調波次数成分を抽出し、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定することにより、その特定された電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定し、電力用コンデンサで発生する異音の高調波発生源の方向性を特定する。   In the present invention, the abnormal noise generated in the power capacitor is detected by the acoustic sensor, the harmonic order component of the abnormal noise is extracted, and the harmonic order component of the voltage and the current corresponding to the harmonic order component of the abnormal noise are extracted. By identifying the harmonic order component, the flow direction of the harmonic order component is determined from the phase difference between the harmonic order component of the specified voltage and the harmonic order component of the current, and generated by the power capacitor. Specify the direction of the harmonic source of the abnormal sound.

このように、簡易な手段により、電力用コンデンサから発生する異音の原因となっている高調波発生源の方向性を正しく特定することができるので、電力用コンデンサで発生する異音の高調波発生源を探査する作業が正確かつ効率よく行え、信頼性の向上が図れると共に作業時間の短縮化が図れてその実用的価値が大きい。   As described above, since the directivity of the harmonic generation source that causes the abnormal noise generated from the power capacitor can be correctly identified by simple means, the abnormal harmonic generated by the power capacitor can be specified. The work of exploring the source can be performed accurately and efficiently, improving the reliability and shortening the working time, and its practical value is great.

本発明に係る高調波探査方法および高調波探査装置の実施形態を以下に詳述する。図１は、電力系統の配電線１に接続された受電設備２およびその受電設備２に設置された高調波探査装置を例示する。電力系統の配電線１には、受電設備２内の変圧器３を介して負荷設備が接続されている。また、この受電設備２内には、電力用コンデンサ４が設置されている。   Embodiments of the harmonic exploration method and the harmonic exploration apparatus according to the present invention will be described in detail below. FIG. 1 illustrates a power receiving facility 2 connected to a distribution line 1 of a power system and a harmonic exploration device installed in the power receiving facility 2. A load facility is connected to the distribution line 1 of the power system via a transformer 3 in the power receiving facility 2. Further, a power capacitor 4 is installed in the power receiving facility 2.

この実施形態における高調波探査装置は、図１に示すように、受電設備２内の配電線１に接続され、その配電線１における電圧および電流を測定する計器用変圧器５および計器用変流器６と、それら計器用変圧器５および計器用変流器６を介して配電線１に接続され、電圧の高調波次数成分と電流の高調波次数成分を抽出する高調波測定器７と、電力用コンデンサ４で発生する異音を検出する音響センサであるマイクロフォン８と、入力側にマイクロフォン８が接続されると共に出力側に高調波測定器７が接続され、電力用コンデンサ４で発生する異音のみを抽出する探査用測定器９とで構成されている。   As shown in FIG. 1, the harmonic exploration device in this embodiment is connected to a distribution line 1 in a power receiving facility 2 and measures a voltage and current in the distribution line 1 and a current transformer for the instrument. And a harmonic measuring instrument 7 connected to the distribution line 1 through the instrument transformer 5 and the instrument current transformer 6 for extracting the harmonic order component of the voltage and the harmonic order component of the current, A microphone 8, which is an acoustic sensor that detects abnormal noise generated in the power capacitor 4, and a microphone 8 is connected to the input side and a harmonic measuring device 7 is connected to the output side. It is comprised with the measuring device 9 for a search which extracts only a sound.

前述の高調波測定器７は、計器用変圧器５および計器用変流器６で測定された電圧および電流をデジタル変換するＡ／Ｄ変換部１１と、デジタル変換された電圧データおよび電流データを記録するデータ記録部１２と、電圧データおよび電流データに基づいて基本波の整数倍に分解する周波数解析部１３とで構成されている。この高調波測定器７における処理結果は、図示しないが、モニタ等に表示されるようになっている。   The harmonic measuring instrument 7 described above includes an A / D converter 11 for digitally converting the voltage and current measured by the instrument transformer 5 and the instrument current transformer 6, and the digitally converted voltage data and current data. A data recording unit 12 for recording and a frequency analysis unit 13 for decomposing the data into integer multiples of the fundamental wave based on the voltage data and the current data. The processing result in the harmonic measuring device 7 is displayed on a monitor or the like (not shown).

また、探査用測定器９は、マイクロフォン８の出力信号を増幅する増幅部１４と、マイクロフォン８の出力信号から、電力用コンデンサ４で発生する異音と対応する周波数成分のみを抽出する可変フィルタ部１５とで構成されている。この探査用測定器９には、マイクロフォン８からの再生音を聞きながら可変フィルタ部１５の抽出周波数を調整するため、ヘッドフォン１６が取り付けられている。   The exploration measuring instrument 9 includes an amplifying unit 14 that amplifies the output signal of the microphone 8 and a variable filter unit that extracts, from the output signal of the microphone 8, only the frequency component corresponding to the abnormal sound generated in the power capacitor 4. 15. A headphone 16 is attached to the survey measuring instrument 9 in order to adjust the extraction frequency of the variable filter unit 15 while listening to the reproduced sound from the microphone 8.

この高調波探査装置が設置された電力系統の配電線１では、電圧および電流に歪みが生じ、特に、図２（Ａ）（Ｂ）に示すように電圧に対して電流に大きな歪みが生じやすい。この電圧および電流の歪みとなる高調波成分を発生させている高調波発生源を探査するため、この高調波探査装置では、配電線１における電圧および電流を計器用変圧器５および計器用変流器６により測定する。   In the distribution line 1 of the electric power system in which this harmonic exploration device is installed, distortion occurs in the voltage and current, and in particular, large distortion is likely to occur in the current with respect to the voltage as shown in FIGS. . In order to search for a harmonic generation source that generates a harmonic component that is a distortion of the voltage and current, the harmonic exploration device uses the voltage transformer and the current transformer for the voltage and current in the distribution line 1 as the voltage and current. Measure with the instrument 6.

測定結果として得られた電圧および電流に基づいて、図３（Ａ）（Ｂ）に示すように、電圧の高調波次数成分と電流の高調波次数成分とを高調波測定器７により抽出する。この電圧の高調波次数成分と電流の高調波次数成分の位相差から、図４に示すように、その高調波次数成分の潮流方向（電源⇒負荷、あるいは、負荷⇒電源）を判定する。これにより、計器用変流器６が取り付けられた箇所での高調波発生源の方向性（電源側あるいは負荷側のいずれか）を特定する。   Based on the voltage and current obtained as a measurement result, the harmonic order component of the voltage and the harmonic order component of the current are extracted by the harmonic measuring device 7 as shown in FIGS. From the phase difference between the harmonic order component of the voltage and the harmonic order component of the current, as shown in FIG. 4, the flow direction of the harmonic order component (power source → load or load → power source) is determined. Thereby, the directionality (either the power source side or the load side) of the harmonic generation source at the location where the current transformer 6 for instrument is attached is specified.

このようにして高調波次数成分の潮流方向が判明すれば、この潮流方向を逆行しながら適宜の箇所で、再度、電圧の高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定する。この電圧高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定する作業をその潮流方向に対して逆行しながら繰り返すことにより、高調波発生源を探査する。   Once the direction of the harmonic order component is determined in this way, the phase difference between the harmonic order component of the voltage and the harmonic order component of the current is again determined at an appropriate location while reversing the direction of the current flow. Determine the tidal direction of the wave order component. Exploring the harmonic source by repeating the work of determining the direction of the harmonic order component from the phase difference between the voltage harmonic order component and the current harmonic order component while reversing the direction of the current. To do.

一方、電力用コンデンサ４が高調波障害により異音を発生する場合がある。この電力用コンデンサ４に異音を発生させる高調波発生源を探査する場合も、前述したように、電力系統の配電線１における電圧および電流を測定し、その電圧の高調波次数成分と電流の高調波次数成分とを抽出して電圧の高調波次数成分と電流の高調波次数成分の位相差から、その高調波次数成分の潮流方向を判定することにより、高調波発生源の方向性を特定するが、電圧の高調波次数成分と電流の高調波次数成分とを抽出した測定結果には、多くの高調波次数成分が含まれていることから、どの高調波次数成分が電力用コンデンサ４から発生する異音の原因となっているかを判定することが困難である。   On the other hand, the power capacitor 4 may generate abnormal noise due to harmonic interference. When searching for a harmonic generation source that generates abnormal noise in the power capacitor 4, as described above, the voltage and current in the distribution line 1 of the power system are measured, and the harmonic order component and current of the voltage are measured. Identify the direction of the harmonic source by extracting the harmonic order component and determining the direction of the harmonic order component from the phase difference between the harmonic order component of the voltage and the harmonic order component of the current. However, since many harmonic order components are included in the measurement result obtained by extracting the harmonic order component of the voltage and the harmonic order component of the current, which harmonic order component is extracted from the power capacitor 4. It is difficult to determine whether it is the cause of the abnormal noise that occurs.

そこで、この実施形態の高調波探査装置では、電力用コンデンサ４で発生する異音をマイクロフォン８で検出することにより電気信号に変換する。ここで、電力用コンデンサ４の周辺では種々の雑音が発生しているのが通常である。つまり、電力用コンデンサ４で発生する異音は、周囲の雑音と混在している状態となっている。   Therefore, in the harmonic exploration device of this embodiment, the abnormal sound generated by the power capacitor 4 is detected by the microphone 8 and converted into an electric signal. Here, it is normal that various noises are generated around the power capacitor 4. That is, the abnormal noise generated in the power capacitor 4 is mixed with the surrounding noise.

従って、マイクロフォン８で検出された信号から電力用コンデンサ４周辺で発生した雑音を探査用測定器９により除去し、電力用コンデンサ４で発生する異音のみを抽出する。つまり、探査用測定器９では、マイクロフォン８で検出された電気信号を増幅部１４で所定のゲインでもって増幅し、ヘッドフォン１６でマイクロフォン８による再生音を聞きながら、可変フィルタ部１５の通過周波数を調整して電力用コンデンサ４周辺で発生した雑音の周波数成分を除去することにより、電力用コンデンサ４で発生した異音の周波数成分のみを抽出する。   Therefore, the noise generated around the power capacitor 4 is removed from the signal detected by the microphone 8 by the measuring instrument 9 and only the abnormal noise generated at the power capacitor 4 is extracted. In other words, the exploration measuring instrument 9 amplifies the electrical signal detected by the microphone 8 with a predetermined gain by the amplifying unit 14, and listens to the reproduced sound from the microphone 8 by the headphone 16, while changing the passing frequency of the variable filter unit 15. By adjusting and removing the frequency component of noise generated around the power capacitor 4, only the frequency component of abnormal noise generated in the power capacitor 4 is extracted.

この電力用コンデンサ４で発生した異音の周波数成分を探査用測定器９から出力し、その異音の周波数成分に基づいて高調波測定器７により異音の高調波次数成分を抽出する（図５参照）。一方、この高調波測定器７では、前述したように、配電線１における電圧の高調波次数成分と電流の高調波次数成分を抽出しているので〔図３（Ａ）（Ｂ）〕、異音の高調波次数成分と、電圧の高調波次数成分および電流の高調波次数成分とを比較し、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定する。その特定された電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定する。これにより、電力用コンデンサ４で発生する異音の高調波発生源の方向性を正しく特定することができる。   The frequency component of the abnormal noise generated by the power capacitor 4 is output from the exploration measuring device 9, and the harmonic order component of the abnormal noise is extracted by the harmonic measuring device 7 based on the frequency component of the abnormal noise (FIG. 5). On the other hand, the harmonic measuring instrument 7 extracts the harmonic order component of the voltage and the harmonic order component of the current in the distribution line 1 as described above (FIGS. 3A and 3B). Compares the harmonic order component of the sound with the harmonic order component of the voltage and the harmonic order component of the current, and compares the harmonic order component of the voltage and the harmonic order component of the current corresponding to the harmonic order component of the abnormal sound. Identify. From the phase difference between the harmonic order component of the specified voltage and the harmonic order component of the current, the flow direction of the harmonic order component is determined. As a result, it is possible to correctly specify the directionality of the abnormal harmonic generation source generated in the power capacitor 4.

なお、前述したように、探査用測定器９で、電力用コンデンサ４で発生する異音の周波数成分のみを正確に抽出することにより、高調波測定器７において、異音の高調波次数成分と、電圧の高調波次数成分および電流の高調波次数成分との比較が容易となる。その結果、異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定し易くなり、異音による高調波次数成分の潮流方向を正確に判定できる。これにより、電力用コンデンサ４で発生する異音の高調波発生源の方向性を特定する上で信頼性の向上が図れる。   Note that, as described above, the harmonic measuring device 7 accurately extracts only the frequency component of the abnormal noise generated in the power capacitor 4 by the exploration measuring instrument 9, and the harmonic measuring instrument 7 It becomes easy to compare the harmonic order component of the voltage and the harmonic order component of the current. As a result, it becomes easy to specify the harmonic order component of the voltage and the harmonic order component of the current corresponding to the harmonic order component of the abnormal sound, and the flow direction of the harmonic order component due to the abnormal sound can be accurately determined. Thereby, it is possible to improve the reliability in identifying the directionality of the harmonic generation source of the abnormal noise generated in the power capacitor 4.

本発明は前述した実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

本発明の実施形態で、電力系統の配電線に接続された受電設備およびその受電設備に設置された高調波探査装置を示す概略構成図である。In embodiment of this invention, it is a schematic block diagram which shows the harmonic survey apparatus installed in the power receiving installation connected to the power distribution line of the electric power grid, and the power receiving installation. （Ａ）は図１の高調波測定器に入力される電圧を示す波形図、（ｂ）は図１の高調波測定器に入力される電流を示す波形図である。(A) is a wave form diagram which shows the voltage input into the harmonic measuring device of FIG. 1, (b) is a wave form diagram which shows the electric current input into the harmonic measuring device of FIG. （Ａ）は図１の高調波測定器で周波数解析された電圧のスペクトル図、（Ｂ）は図１の高調波測定器で周波数解析された電流のスペクトル図である。(A) is the spectrum diagram of the voltage frequency-analyzed by the harmonic measuring device of FIG. 1, (B) is the spectrum diagram of the current frequency-analyzed by the harmonic measuring device of FIG. 電圧の高調波次数成分と電流の高調波次数成分と潮流方向を示す一覧表である。It is a table | surface which shows the harmonic order component of a voltage, the harmonic order component of an electric current, and a tidal direction. 図１の高調波測定器で周波数解析された異音のスペクトル図である。It is the spectrum figure of the abnormal sound frequency-analyzed with the harmonic measuring device of FIG.

符号の説明Explanation of symbols

１ 配電線
２ 受電設備
４ 電力用コンデンサ
５ 計器用変圧器
６ 計器用変流器
７ 高調波測定器
８ 音響センサ（マイクロフォン）
９ 探査用測定器
１５ 可変フィルタ部 DESCRIPTION OF SYMBOLS 1 Distribution line 2 Power receiving equipment 4 Electric power capacitor 5 Instrument transformer 6 Instrument current transformer 7 Harmonic measuring instrument 8 Acoustic sensor (microphone)
9 Measuring instrument for exploration 15 Variable filter section

Claims (3)

電力系統の配電線における電圧および電流を測定してその電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定することにより、前記配電線に設けられた受電設備内の電力用コンデンサで発生する異音の高調波発生源の方向性を特定する高調波探査方法であって、
前記電力用コンデンサで発生する異音を検出してその異音の高調波次数成分を抽出し、前記異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定することを特徴とする高調波探査方法。 By measuring the voltage and current in the distribution line of the power system and determining the flow direction of the harmonic order component from the phase difference between the harmonic order component of the voltage and the harmonic order component of the current, the distribution line A harmonic exploration method for identifying the directionality of an abnormal sound harmonic generation source generated by a power capacitor in a power receiving facility provided in
The abnormal noise generated in the power capacitor is detected and the harmonic order component of the abnormal noise is extracted, and the harmonic order component of the voltage and the harmonic order component of the current corresponding to the harmonic order component of the abnormal noise are extracted. A harmonic exploration method characterized by specifying. 電力系統の配電線における電圧および電流を測定する計器用変圧器および計器用変流器と、前記計器用変圧器および計器用変流器の出力に基づいて電圧の高調波次数成分と電流の高調波次数成分を抽出する高調波測定器とを備え、電圧の高調波次数成分と電流の高調波次数成分との位相差から、その高調波次数成分の潮流方向を判定することにより、前記配電線に設けられた受電設備内の電力用コンデンサで発生する異音の高調波発生源の方向性を特定する高調波探査装置であって、
前記電力用コンデンサで発生する異音を検出する音響センサを備え、その音響センサにより得られた異音の高調波次数成分を高調波測定器で抽出し、前記異音の高調波次数成分に対応する電圧の高調波次数成分と電流の高調波次数成分を特定することを特徴とする高調波探査装置。 Instrument transformers and instrument current transformers for measuring voltage and current in distribution lines of the power system, and harmonic order components of voltage and current harmonics based on outputs of the instrument transformers and instrument current transformers A harmonic measuring device for extracting the wave order component, and determining the flow direction of the harmonic order component from the phase difference between the harmonic order component of the voltage and the harmonic order component of the current, thereby distributing the distribution line. A harmonic exploration device that identifies the directionality of an abnormal harmonic generation source generated by a power capacitor in a power receiving facility provided in
Equipped with an acoustic sensor that detects abnormal noise generated by the power capacitor, and the harmonic order component of the abnormal noise obtained by the acoustic sensor is extracted by a harmonic measuring instrument, and corresponds to the harmonic order component of the abnormal noise. A harmonic exploration device that identifies a harmonic order component of a voltage to be detected and a harmonic order component of a current. 前記音響センサにより検出された信号から電力用コンデンサ周辺で発生した雑音を除去し、電力用コンデンサから発生する異音のみを抽出する可変フィルタ部が内蔵された探査用測定器を、前記音響センサの後段に設けた請求項２に記載の高調波探査装置。   An exploration measuring instrument having a built-in variable filter unit that removes noise generated around the power capacitor from the signal detected by the acoustic sensor and extracts only the abnormal sound generated from the power capacitor is provided on the acoustic sensor. The harmonic exploration device according to claim 2 provided in the latter part.
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