JPH0974660A - Harmonic detector - Google Patents
Harmonic detectorInfo
- Publication number
- JPH0974660A JPH0974660A JP7252001A JP25200195A JPH0974660A JP H0974660 A JPH0974660 A JP H0974660A JP 7252001 A JP7252001 A JP 7252001A JP 25200195 A JP25200195 A JP 25200195A JP H0974660 A JPH0974660 A JP H0974660A
- Authority
- JP
- Japan
- Prior art keywords
- harmonics
- current
- voltage
- order
- harmonic
- 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.)
- Pending
Links
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、種々の電力設備の
受電部に設けられて高調波を検出する高調波検出装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmonic wave detecting device which is provided in a power receiving section of various electric power facilities and detects a harmonic wave.
【０００２】[0002]
【従来の技術】従来、電力設備の１例である特高又は高
圧受電需用自家設備においては、高調波から自家設備を
保護するため、デジタル継電器等で形成された受電部の
高調波検出装置により高調波を検出して遮断器の開放等
を行う必要がある。2. Description of the Related Art Conventionally, in high-voltage or high-voltage power-supply / demand self-use equipment, which is an example of power equipment, in order to protect the self-use equipment from harmonics, a harmonic detection device for a power receiving section formed by a digital relay or the like Therefore, it is necessary to detect harmonics and open the circuit breaker.
【０００３】そして、従来のこの種高調波検出装置にお
いては、設備の受電電力の電流，電圧の検出に基づき、
電流，電圧の高調波の発生量を個別に監視して検出し、
この検出結果にしたがって前記遮断器の開放等を行って
いる。In the conventional harmonic detecting device of this type, based on the detection of the current and voltage of the received power of the equipment,
The amount of harmonics of current and voltage is individually monitored and detected,
The circuit breaker is opened according to the detection result.
【０００４】[0004]
【発明が解決しようとする課題】前記従来の高調波検出
装置の場合、高調波発生量を電流，電圧の別に監視して
検出するのみであるため、その検出結果からは各次数の
高調波が自家設備等の電力設備の内，外のいずれで発生
しているのかは分からず、それらの高調波の電源から電
力設備への流入，その逆の流出，すなわち流れる方向を
考慮した精度の高い検出が行えない問題点があり、この
結果、高調波からの適切な保護が図れない。In the case of the above-mentioned conventional harmonic detection device, since the amount of generated harmonics is only monitored and detected for each of current and voltage, the harmonics of each order are detected from the detection result. It is not known whether the power is generated inside or outside the power equipment such as private equipment, and high-accuracy detection considering the inflow of the harmonics from the power supply to the power equipment and the reverse outflow, that is, the flowing direction. However, as a result, proper protection from harmonics cannot be achieved.
【０００５】本発明は、各次数の高調波の流れる方向を
検出し、この検出を考慮した精度の高い高調波検出を可
能にすることを目的とする。It is an object of the present invention to detect the flowing direction of harmonics of each order and to enable highly accurate harmonic detection in consideration of this detection.
【０００６】[0006]
【課題を解決するための手段】前記の目的を達成するた
めに、この出願の請求項１に係る高調波検出装置におい
ては、電力設備の受電部に設けた変流器，計器用変圧器
の検出出力を電流，電圧それぞれの演算部に供給し、両
演算部により電流，電圧それぞれの高調波を次数別に求
めて判定部に供給し、判定部により次数毎の電流，電圧
の高調波の位相差から高調波の流れる方向が電力設備に
流入する方向，その逆の流出する方向のいずれであるか
を次数別に判別して検出する。In order to achieve the above-mentioned object, in the harmonic detecting device according to claim 1 of the present application, there is provided a current transformer and an instrument transformer provided in a power receiving portion of power equipment. The detection output is supplied to the current and voltage calculation units, the current and voltage harmonics are obtained by both calculation units and supplied to the determination unit, and the determination unit determines the current and voltage harmonic levels for each order. Based on the phase difference, the direction in which harmonics flow into the electric power equipment is the direction in which the harmonics flow, and the opposite direction is the outflow direction.
【０００７】したがって、電流，電圧の演算部により電
流，電圧の高調波それぞれが次数別に求められ、判定部
により次数毎の電流，電圧の高調波の位相差から次数毎
の高調波の流れる方向が検出される。Therefore, the current and voltage harmonics are obtained for each order by the current and voltage calculation units, and the direction in which the harmonics flow for each order is determined from the phase difference between the current and voltage harmonics for each order by the determination unit. To be detected.
【０００８】そのため、この方向の検出に基づき、各次
数の高調波の流れる方向を考慮した精度の高い高調波検
出が可能になる。Therefore, based on the detection of this direction, it is possible to detect the harmonics with high accuracy in consideration of the flowing direction of the harmonics of each order.
【０００９】[0009]
【発明の実施の形態】つぎに、発明の実施の１形態につ
いて説明する。図１は特高又は高圧受電需用自家設備の
単線系統図であり、同図において、１は電力会社より供
給を受ける商用電源（系統電源）、２は商用電源１が給
電される特高又は高圧受電需用自家設備（以下自家設備
という）である。BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described. FIG. 1 is a single-line system diagram of a private facility for extra-high voltage or high-voltage power supply and demand. This is private equipment for high-voltage power demand (hereinafter called private equipment).
【００１０】３は自家設備２の受電部に設けられた電流
検出用の変流器、４は変流器３を介した商用電源１が給
電される母線、５は母線４の電圧を検出する電圧検出用
の計器用変圧器、６は変流器３，計器用変圧器５の２次
側検出出力が供給されるデジタル継電器であり、変流器
３，計器用変圧器５とともに方向判定機能付きの高調波
検出装置を形成する。Reference numeral 3 is a current transformer provided in the power receiving portion of the private facility 2 for current detection, 4 is a bus bar to which the commercial power source 1 is fed via the current transformer 3, and 5 is a voltage of the bus bar 4. A voltage transformer for voltage detection, 6 is a digital relay to which the secondary side detection output of the current transformer 3 and the voltage transformer 5 is supplied, and a direction determination function together with the current transformer 3 and the voltage transformer 5 Form a harmonic detection device.
【００１１】７は母線４とその下流側の配電線８との間
に設けられた配電用変圧器、９は配電線８に接続された
負荷であり、例えばインバータ負荷等の高調波発生負荷
からなる。Reference numeral 7 is a distribution transformer provided between the bus bar 4 and the distribution line 8 on the downstream side thereof, and 9 is a load connected to the distribution line 8, for example, from a harmonic generation load such as an inverter load. Become.
【００１２】さらに、図２は継電器６の構成を示し、同
図において、１０，１１は変流器３，変圧器５の２次側
検出出力がＡ／Ｄ変換されて供給される電流，電圧それ
ぞれの演算部であり、フーリエ変換の演算により電流，
電圧それぞれの高調波を次数別に求める。１２は演算部
１０，１１の演算結果が供給される判定部であり、高調
波の流れる方向が自家設備２に流入する方向，その逆の
流出する方向のいずれであるかを次数別に判別して検出
する。Further, FIG. 2 shows the configuration of the relay 6, in which 10 and 11 are current and voltage supplied by A / D conversion of the secondary side detection outputs of the current transformer 3 and the transformer 5. These are the calculation units, and the current,
Find harmonics of each voltage by order. Reference numeral 12 is a determination unit to which the calculation results of the calculation units 10 and 11 are supplied, and determines whether the harmonics flow in the inflow direction into the private facility 2 or in the opposite outflow direction by order. To detect.
【００１３】そして、商用電源１は遮断器（図示せ
ず），変流器３，母線４を介して配電用変圧器７に供給
され、この変圧器７により降圧された後、配電線８を介
して負荷９等に給電される。Then, the commercial power supply 1 is supplied to a distribution transformer 7 via a circuit breaker (not shown), a current transformer 3 and a bus 4, and after being stepped down by this transformer 7, a distribution line 8 is connected. Power is supplied to the load 9 and the like via the load.
【００１４】このとき、自家設備２の受電電力には負荷
９等の自家設備２の内，外で発生した複数次数の高調波
が含まれ、これらの高調波の流れる方向はその有効分
（有効電力）の正，負に基づき、有効分が正であれば商
用電源１から自家設備２に流入する方向になり、有効分
が負であれば自家設備２から商用電源１に流出する方向
になり、次数によって異なる。At this time, the received electric power of the private facility 2 includes harmonics of a plurality of orders generated inside and outside the private facility 2 such as the load 9, and the direction of flow of these harmonics is the effective component (effective). Based on the positive or negative of (electrical power), if the effective component is positive, it will flow from the commercial power source 1 into the private facility 2, and if the effective component is negative, it will flow from the private facility 2 to the commercial power source 1. , Depends on the order.
【００１５】そして、変流器３の高調波を含む電流の検
出出力はＡ／Ｄ変換されて電流の演算部１０に供給さ
れ、この演算部１０は例えば図３の電流検出波形にフー
リエ変換の演算を施し、この波形から例えば図４の基本
波ａ及び高調波ｂ，ｃ，ｄを分別して求める。Then, the detected output of the current containing the harmonics of the current transformer 3 is A / D converted and supplied to the current calculation section 10, which calculates the current detection waveform by Fourier transform, for example. A calculation is performed, and the fundamental wave a and the harmonics b, c, and d of FIG. 4 are classified and obtained from this waveform.
【００１６】同時に、計器用変圧器５の高調波を含む電
圧の検出出力はＡ／Ｄ変換されて電圧の演算部１１に供
給され、この演算部１１は電圧検出波形に演算部１０の
変換と同様のフーリエ変換を施し、図４の基本波ａ及び
高調波ｂ，ｃ，ｄに相当する基本波及び各次数の高調波
を分別して求める。At the same time, the detection output of the voltage including the harmonics of the instrument transformer 5 is A / D converted and supplied to the voltage calculation unit 11, which converts the voltage detection waveform into the voltage detected by the calculation unit 10. The same Fourier transform is performed to separate and obtain the fundamental wave corresponding to the fundamental wave a and the harmonics b, c, and d of FIG. 4 and the harmonics of each order.
【００１７】そして、両演算部１０，１１の基本波及び
例えば５，７，１１，１３の各次数の高調波のデータが
判定部１２に供給され、この判定部１２は与えられたデ
ータに基づき、次数毎に電流，電圧の高調波の位相差を
求める。Then, the fundamental wave data of both arithmetic units 10 and 11 and, for example, the harmonic data of each order of 5, 7, 11, and 13 are supplied to the judging unit 12, and the judging unit 12 is based on the given data. , Phase difference of current and voltage harmonics is obtained for each order.
【００１８】このとき、例えば負荷９により発生して自
家設備２から商用電源１に流出する高調波であれば、そ
の有効電力が負になり、図５に示すように、電圧のベク
トルを基準にした電流のベクトルは角度θ1 の順方向
のベクトルになり、電流，電圧の位相差が角度θ1 と
して求まる。At this time, for example, if the harmonics are generated by the load 9 and flow out from the private facility 2 to the commercial power source 1, the active power becomes negative, and as shown in FIG. 5, the voltage vector is used as a reference. The vector of the obtained current becomes a vector in the forward direction of the angle θ 1 , and the phase difference between the current and the voltage is obtained as the angle θ 1 .
【００１９】また、商用電源１側で発生して自家設備２
に流入する高調波であれば、その有効電力は正になり、
図５に示すように、電流のベクトルは角度θ2 の逆方向
のベクトルになり、電流，電圧の位相差が角度θ2 と
して求まる。[0019] In addition, it is generated on the side of the commercial power source 1
If the harmonics that flow into the
As shown in FIG. 5, the current vector becomes a vector in the opposite direction of the angle θ 2 , and the phase difference between the current and the voltage is obtained as the angle θ 2 .
【００２０】なお、高調波の電流，電圧の位相差は、自
家設備２の負荷特性がインダクタンス性であれば０°〜
−９０°又は＋９０°〜＋１８０°の範囲になり、容量
性であれば０°〜＋９０°又は−９０°〜−１８０°の
範囲になる。The phase difference between the current and the voltage of the harmonic is 0 ° if the load characteristic of the private facility 2 is inductance.
The range is −90 ° or + 90 ° to + 180 °, and the range 0 ° to + 90 ° or −90 ° to −180 ° for capacitive.
【００２１】また、前記位相差が０°〜±９０°の範囲
であれば、その高調波は有効電力が正になって自家設備
２に流入し、前記位相差が±９０°より大きければ、そ
の高調波は有効電力が負になって自家設備２から流出す
る。したがって、高調波の流れる方向は自家設備２の負
荷特性には関係しない。When the phase difference is in the range of 0 ° to ± 90 °, the harmonics have positive active power and flow into the private facility 2, and when the phase difference is larger than ± 90 °, The harmonics have negative active power and flow out of the private facility 2. Therefore, the direction in which the harmonic flows does not relate to the load characteristics of the private facility 2.
【００２２】そして、判定部１２は次数毎の電流，電圧
の位相差から高調波の流れる方向を次数別に判別して検
出する。Then, the judging section 12 judges and detects the flowing direction of the harmonics for each order from the phase difference between the current and the voltage for each order.
【００２３】さらに、基本波に対する各次数の高調波の
比を高調波電流含有率として求め、その結果を、例え
ば、流入方向であれば０〜＋１ｍＡ，流出方向であれば
０〜−１ｍＡとする０〜±１ｍＡのアナログ信号で評価
する。Further, the ratio of the harmonic of each order to the fundamental wave is obtained as the harmonic current content rate, and the result is, for example, 0 to +1 mA in the inflow direction and 0 to -1 mA in the outflow direction. Evaluation is made with an analog signal of 0 to ± 1 mA.
【００２４】そして、この評価に基づき、高調波が許容
値以上の状態になると、受電端等の遮断器の切指令を発
生し、高調波による事故を防止する。Then, based on this evaluation, when the harmonics are in a state of being higher than the allowable value, an instruction to turn off the circuit breaker such as the power receiving end is generated to prevent an accident due to the harmonics.
【００２５】したがって、高調波の次数毎の評価に基づ
き、各次数の高調波の流れる方向を考慮した精度の高い
高調波検出が行え、この検出に基づき、高精度の事故防
止等が図れる。そして、種々の電力設備の高調波検出に
適用できるのは勿論である。Therefore, high-accuracy harmonic detection can be performed in consideration of the flowing direction of the harmonic of each order based on the evaluation of each harmonic order, and based on this detection, highly accurate accident prevention and the like can be achieved. And, of course, it can be applied to the harmonic detection of various electric power equipment.
【００２６】[0026]
【発明の効果】この発明は、以下に記載する効果を奏す
る。変流器３，計器用変圧器５の検出出力に基づき、電
流．電圧それぞれの演算部１０，１１により電流，電圧
の高調波それぞれを次数別に求め、判定部１２により次
数毎の電流，電圧の高調波の位相差から次数毎の高調波
の流れる方向を検出することができ、この検出を考慮し
た精度の高い高調波検出が可能になる。The present invention has the following effects. Based on the detection output of the current transformer 3 and the instrument transformer 5, the electric current. Each of the voltage calculation units 10 and 11 obtains the harmonics of the current and voltage for each order, and the determination unit 12 detects the flowing direction of the harmonics of each order from the phase difference between the harmonics of the current and voltage of each order. This makes it possible to detect harmonics with high accuracy in consideration of this detection.
【図１】本発明の実施の１形態の系統図である。FIG. 1 is a system diagram of an embodiment of the present invention.
【図２】図１の一部の詳細なブロック図である。2 is a detailed block diagram of a portion of FIG. 1. FIG.
【図３】高調波を含んだ電流の波形図である。FIG. 3 is a waveform diagram of a current including harmonics.
【図４】図３の電流から分離された基本波及び高調波の
波形図である。FIG. 4 is a waveform diagram of a fundamental wave and a harmonic wave separated from the current of FIG.
【図５】図２の判定部の動作説明用のベクトル図であ
る。5 is a vector diagram for explaining the operation of the determination unit in FIG.
３ 変流器 ５ 計器用変圧器 １０ 電流の演算部 １１ 電圧の演算部 １２ 判定部 3 Current transformer 5 Transformer for instrument 10 Current calculation unit 11 Voltage calculation unit 12 Judgment unit
Claims (1)
用変圧器の検出出力を電流，電圧それぞれの演算部に供
給し、 前記両演算部により電流，電圧それぞれの高調波を次数
別に求めて判定部に供給し、 前記判定部により次数毎の電流，電圧の高調波の位相差
から高調波の流れる方向が前記電力設備に流入する方
向，その逆の流出する方向のいずれであるかを次数別に
判別して検出することを特徴とする高調波検出装置。1. A detection output of a current transformer and an instrument transformer provided in a power receiving section of a power facility is supplied to current and voltage calculation sections, respectively, and both current and voltage harmonics are ordered by both calculation sections. It is separately obtained and supplied to the determination unit, and the direction in which the harmonic flows from the phase difference between the harmonics of the current and voltage for each order by the determination unit is either the inflow direction to the power equipment or the outflow direction. A harmonic detection device characterized by detecting whether or not it is classified by order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252001A JPH0974660A (en) | 1995-09-04 | 1995-09-04 | Harmonic detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252001A JPH0974660A (en) | 1995-09-04 | 1995-09-04 | Harmonic detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0974660A true JPH0974660A (en) | 1997-03-18 |
Family
ID=17231185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7252001A Pending JPH0974660A (en) | 1995-09-04 | 1995-09-04 | Harmonic detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0974660A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008191108A (en) * | 2007-02-07 | 2008-08-21 | Toshiba Corp | System for evaluating quality of electric power |
| JP2009229184A (en) * | 2008-03-21 | 2009-10-08 | Kansai Electric Power Co Inc:The | Harmonic probing method and device |
| WO2012059061A1 (en) * | 2010-11-04 | 2012-05-10 | 武汉国测恒通智能仪器有限公司 | Method and device for quality-monitoring of high-voltage electrical energy |
| CN106872927A (en) * | 2017-02-16 | 2017-06-20 | 中国电力科学研究院 | The assay method and error analysis method of the harmonic wave degree of accuracy of electronic type voltage transformer |
| CN109813986A (en) * | 2019-03-06 | 2019-05-28 | 中南大学 | A kind of contact net tidal characteristics detection device and method for through cophase supply system |
-
1995
- 1995-09-04 JP JP7252001A patent/JPH0974660A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008191108A (en) * | 2007-02-07 | 2008-08-21 | Toshiba Corp | System for evaluating quality of electric power |
| JP2009229184A (en) * | 2008-03-21 | 2009-10-08 | Kansai Electric Power Co Inc:The | Harmonic probing method and device |
| WO2012059061A1 (en) * | 2010-11-04 | 2012-05-10 | 武汉国测恒通智能仪器有限公司 | Method and device for quality-monitoring of high-voltage electrical energy |
| CN106872927A (en) * | 2017-02-16 | 2017-06-20 | 中国电力科学研究院 | The assay method and error analysis method of the harmonic wave degree of accuracy of electronic type voltage transformer |
| CN109813986A (en) * | 2019-03-06 | 2019-05-28 | 中南大学 | A kind of contact net tidal characteristics detection device and method for through cophase supply system |
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