JPH0843459A - High-harmonic content monitoring device - Google Patents
High-harmonic content monitoring deviceInfo
- Publication number
- JPH0843459A JPH0843459A JP6183216A JP18321694A JPH0843459A JP H0843459 A JPH0843459 A JP H0843459A JP 6183216 A JP6183216 A JP 6183216A JP 18321694 A JP18321694 A JP 18321694A JP H0843459 A JPH0843459 A JP H0843459A
- Authority
- JP
- Japan
- Prior art keywords
- harmonic
- harmonic content
- content rate
- current
- monitoring 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.)
- Pending
Links
- 238000012806 monitoring device Methods 0.000 title claims description 43
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000000470 constituent Substances 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 27
- 238000012544 monitoring process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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
- Y02E40/30—Reactive power compensation
Landscapes
- Protection Of Static Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高調波含有率監視装
置、特に複数のコンデンサ回路等の機器を備えて力率調
整を行う系統において、当該機器を高調波過電流から保
護する高調波含有率監視装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmonic content rate monitoring device, and in particular, in a system for adjusting a power factor with a plurality of devices such as capacitor circuits, the harmonic content protection device protects the device from harmonic overcurrent. Rate monitoring device.
【０００２】[0002]
【従来の技術】近年、ビルや工場内外の半導体応用機器
より発生する高調波が、電力設備の各機器に様々な障害
を与えるという事例が急増しており、受変電設備の保護
を目的とした高調波対策が重要視されている。系統の力
率改善を行うための高圧コンデンサ回路においても例外
ではない。2. Description of the Related Art In recent years, there have been an increasing number of cases in which harmonics generated from semiconductor applied equipment inside and outside buildings and factories give various obstacles to each equipment of electric power equipment. Harmonic countermeasures are considered important. The high-voltage capacitor circuit for improving the power factor of the system is no exception.
【０００３】力率改善用に設置されるコンデンサは、通
常、複数のバンクが用意され、力率に応じて入り切りが
行われる。高調波電流からこれら複数のコンデンサバン
クを保護するためには、各々のコンデンサ回路に高調波
過電流リレーを用意することにより行う。A plurality of banks are usually prepared for capacitors installed for power factor improvement, and switching is performed depending on the power factor. To protect these multiple capacitor banks from harmonic currents, a harmonic overcurrent relay is prepared for each capacitor circuit.
【０００４】図４は従来のコンデンサ回路を備える系統
の構成図である。図４では、コンデンサバンクを４回路
備えて系統の力率制御を行っている。FIG. 4 is a block diagram of a system including a conventional capacitor circuit. In FIG. 4, four capacitor banks are provided for system power factor control.
【０００５】従来においては、コンデンサ４−１〜４−
４及び直列リアクトル３−１〜３−４で構成される４つ
のコンデンサ回路に対して、それぞれ開閉器１−１〜１
−４及び高調波過電流リレー１０２−１〜１０２−４を
備え、力率調整装置５による制御、または高調波過電流
リレー１０２−１〜１０２−４による高調波電流の検知
に基づき開閉器１−１〜１−４の開閉制御を行う。Conventionally, the capacitors 4-1 to 4-
4 and the series reactors 3-1 to 3-4 with respect to the four capacitor circuits, respectively, switches 1-1 to 1
-4 and the harmonic overcurrent relays 102-1 to 102-4, the switch 1 based on the control by the power factor adjusting device 5 or the detection of the harmonic current by the harmonic overcurrent relays 102-1 to 102-4. Open / close control of -1 to 1-4 is performed.
【０００６】つまり、力率を希望の範囲に制御するため
の力率制御装置５は、系統の力率を検出して、必要に応
じて開閉器１−１〜１−４を自動的に開閉する。That is, the power factor control device 5 for controlling the power factor within a desired range detects the power factor of the system and automatically opens / closes the switches 1-1 to 1-4 as necessary. To do.
【０００７】高調波電流の流入が多いと、直列リアクト
ル３−１〜３−４及びコンデンサ４−１〜４−４に、過
熱、燃損、または破裂等の不具合が発生する恐れがあ
る。これらの不具合を防止するために、高調波過電流リ
レー１０２−１〜１０２−４を図４に示すようにそれぞ
れの回路に設置する必要がある。高調波過電流リレー１
０２−１〜１０２−４は、高調波が過大に流入している
ことを検出すると、開閉器１−１〜１−４を開放制御す
るようにそれぞれ動作する。If a large amount of harmonic current flows in, the series reactors 3-1 to 3-4 and the capacitors 4-1 to 4-4 may have a problem such as overheating, fuel loss, or rupture. In order to prevent these problems, it is necessary to install the harmonic overcurrent relays 102-1 to 102-4 in each circuit as shown in FIG. Harmonic overcurrent relay 1
02-1 to 102-4 each operate so as to open-control the switches 1-1 to 1-4 when detecting that harmonics excessively flow in.
【０００８】[0008]
【発明が解決しようとする課題】以上のように、従来の
複数のコンデンサ回路を備えて力率調整を行う電力系統
では、高調波電流から複数のコンデンサ回路を保護する
ために、各々のコンデンサ回路に高調波過電流リレーを
設置する必要がある。つまり、コンデンサバンクの数だ
け高調波過電流リレーを用意しなければならず、それだ
け多くのスペースを必要とする上に、多くのコストも要
求されるという問題があった。As described above, in a conventional power system including a plurality of capacitor circuits for power factor adjustment, each capacitor circuit is protected in order to protect the plurality of capacitor circuits from harmonic currents. It is necessary to install a harmonic overcurrent relay at. In other words, there is a problem in that harmonic overcurrent relays must be prepared for the number of capacitor banks, which requires a large amount of space and a large amount of cost.
【０００９】また、既設の設備に高調波保護機能を追加
する改修工事等を行う場合には、改めて制御盤を取り換
える必要がある等、改修しづらいという問題があった。Further, when performing repair work for adding a harmonic protection function to existing equipment, there is a problem that it is difficult to carry out repair because it is necessary to replace the control panel again.
【００１０】本発明は、上記問題点を解決するもので、
複数のコンデンサ回路等の機器を備えて力率調整を行う
系統において、当該機器を高調波過電流から保護するの
みならず、系統全体の体積効率及びコスト効率に優れ
た、更には系統の改修工事を容易に行い得る高調波含有
率監視装置を提供することを目的とする。The present invention solves the above problems,
In a system for adjusting power factor with equipment such as multiple capacitor circuits, it not only protects the equipment from harmonic overcurrent, but also is excellent in volume efficiency and cost efficiency of the entire system. Furthermore, system repair work. It is an object of the present invention to provide a harmonic content rate monitoring device capable of easily performing the above.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に、本発明の第１の特徴の高調波含有率監視装置は、系
統の電流を検出する検出手段と、該電流に含まれる基本
波電流に対する高調波電流の割合（高調波含有率）を算
出する高調波含有率算出手段と、前記高調波含有率が所
定値以上の場合に、前記系統の所定の機器を開放制御す
る旨の信号を出力する出力手段とを有することを特徴と
する。In order to solve the above-mentioned problems, the harmonic content rate monitoring apparatus of the first feature of the present invention is a detecting means for detecting the current of the system, and a fundamental wave contained in the current. Harmonic content rate calculating means for calculating a ratio of harmonic current to current (harmonic content rate), and a signal for controlling opening of a predetermined device of the system when the harmonic content rate is a predetermined value or more. And output means for outputting.
【００１２】また、本発明の第２の特徴の高調波含有率
監視装置は、請求項１に記載の高調波含有率監視装置に
おいて、前記検出手段は、前記複数の機器に接続される
幹線の電流を検出することを特徴とする。A second aspect of the present invention is a harmonic content rate monitoring device according to claim 1, wherein the detecting means is a main line connected to the plurality of devices. It is characterized by detecting an electric current.
【００１３】また、本発明の第３の特徴の高調波含有率
監視装置は、請求項１または２に記載の高調波含有率監
視装置において、系統の電流について各次の調波電流に
分解する分解手段を有し、前記高調波含有率算出手段
は、各次または所定の調波について高調波含有率を算出
し、前記出力手段は、所定の調波について前記高調波含
有率が所定値以上の場合に、前記系統の所定の機器を開
放制御する旨の信号を出力することを特徴とする。The harmonic content rate monitoring device of the third aspect of the present invention is the harmonic content rate monitoring device according to claim 1 or 2, wherein the system current is decomposed into harmonic currents of respective orders. And a decomposition means, wherein the harmonic content rate calculation means calculates a harmonic content rate for each order or a predetermined harmonic, and the output means has a harmonic content rate of a predetermined value or more for a predetermined harmonic. In this case, a signal for controlling the opening of a predetermined device of the system is output.
【００１４】また、本発明の第４の特徴の高調波含有率
監視装置は、請求項１、２、または３に記載の高調波含
有率監視装置において、前記出力手段における高調波含
有率の所定値超過から信号出力するまでの動作時間を指
定する指定手段を有することを特徴とする。A fourth aspect of the present invention is the harmonic content rate monitoring device according to claim 1, 2 or 3, wherein the harmonic content rate is predetermined in the output means. It is characterized by having a designating unit for designating an operation time from when the value is exceeded until a signal is output.
【００１５】また、本発明の第５の特徴の高調波含有率
監視装置は、請求項４に記載の高調波含有率監視装置に
おいて、前記指定手段が指定する動作時間は、高調波含
有率に反比例することを特徴とする。The fifth aspect of the present invention is a harmonic content rate monitoring device according to the fourth aspect, wherein the operating time designated by the designating means is the harmonic content rate. It is characterized by being inversely proportional.
【００１６】[0016]
【作用】本発明の第１及び第２の特徴の高調波含有率監
視装置では、検出手段により系統の電流を検出し、該電
流に含まれる基本波電流に対する高調波電流の割合、即
ち、高調波含有率を高調波含有率算出手段によって算出
し、前記高調波含有率が所定値以上の場合に、出力手段
から前記系統の所定の機器を開放制御する旨の信号を出
力するようにしている。特に、第２の特徴の高調波含有
率監視装置では、検出手段は前記複数の機器に接続され
る幹線の電流を検出する。In the harmonic content rate monitoring device of the first and second features of the present invention, the current of the system is detected by the detecting means, and the ratio of the harmonic current to the fundamental current included in the current, that is, the harmonic current. The wave content rate is calculated by the harmonic content rate calculation means, and when the harmonic content rate is equal to or higher than a predetermined value, the output means outputs a signal for controlling the opening of a predetermined device of the system. . Particularly, in the harmonic content rate monitoring device of the second feature, the detection means detects the current of the main line connected to the plurality of devices.
【００１７】コンデンサ負荷に流入する基本波電流値
は、電圧が一定であれば一定であるので、基本波電流に
対する高調波電流の含有率を監視すれば、高調波電流の
流入量の監視が可能である。Since the fundamental current value flowing into the capacitor load is constant if the voltage is constant, the inflow amount of the harmonic current can be monitored by monitoring the content ratio of the harmonic current to the fundamental current. Is.
【００１８】つまり、系統の自動力率調整を行うため
に、不定時にコンデンサ等の機器を力率調整器で開閉し
ていても、また複数台のコンデンサ等の機器が投入され
ていても、該機器に接続される幹線の電流を検出手段で
検出し、高調波含有率を高調波含有率算出手段で算出
し、高調波含有率が所定値以上の場合に、出力手段から
機器を開放制御する旨の信号を出力すれば、各機器を該
機器の各々に流入する高調波電流値から保護することが
できる。That is, in order to perform automatic power factor adjustment of the system, even if a device such as a capacitor is opened and closed by a power factor adjuster at indefinite time, or if a plurality of devices such as capacitors are turned on, The current of the main line connected to the equipment is detected by the detection means, the harmonic content rate is calculated by the harmonic content rate calculation means, and when the harmonic content rate is a predetermined value or more, the device is controlled to be opened from the output means. By outputting the signal to the effect, each device can be protected from the harmonic current value flowing into each of the devices.
【００１９】このように第１及び第２の特徴の高調波含
有率監視装置では、高調波電流値を直接監視せずに、基
本波電流値に対する高調波電流値の割合（高調波含有
率）を監視するので、不特定数のコンデンサ等の機器を
高調波過電流から保護することが可能である。これによ
り、当該１個の高調波含有率監視装置により前記機器を
高調波過電流から保護することができ、装置の体積効率
及びコスト効率に優れた、更には系統の改修工事を容易
に行い得る高調波含有率監視装置を実現できる。As described above, in the harmonic content rate monitoring device having the first and second characteristics, the ratio of the harmonic current value to the fundamental wave current value (harmonic content rate) is not directly monitored. Therefore, it is possible to protect devices such as an unspecified number of capacitors from harmonic overcurrent. As a result, the device can be protected from the harmonic overcurrent by the one harmonic content rate monitoring device, the volume efficiency and cost efficiency of the device are excellent, and the system repair work can be easily performed. A harmonic content rate monitoring device can be realized.
【００２０】また、本発明の第３の特徴の高調波含有率
監視装置では、検出手段で検出した系統の電流につい
て、分解手段により各次の調波電流に分解し、高調波含
有率算出手段により各次または所定の調波について高調
波含有率を算出し、出力手段によって所定の調波につい
て高調波含有率が所定値以上の場合に、系統の所定の機
器を開放制御する旨の信号を出力するようにしている。
これにより、各次の調波電流に対して極めの細かい高調
波保護が可能となる。In the harmonic content rate monitoring device of the third feature of the present invention, the current of the system detected by the detection means is decomposed into harmonic currents of each order by the decomposition means, and the harmonic content rate calculation means. Calculate the harmonic content rate for each order or a predetermined harmonic, and when the harmonic content rate for the predetermined harmonic is greater than or equal to a predetermined value by the output means, a signal indicating that the predetermined equipment of the system is open controlled is output. I am trying to output.
This enables extremely fine harmonic protection for each harmonic current.
【００２１】また、本発明の第４及び第５の特徴の高調
波含有率監視装置では、出力手段における高調波含有率
の所定値超過から信号出力するまでの動作時間を、指定
手段により指定するようにしている。特に第５の特徴の
高調波含有率監視装置では、指定手段が指定する動作時
間を高調波含有率に反比例するようにしている。これに
より、保護対象の機器の特性に応じた保護の制御が可能
となる。Further, in the harmonic content rate monitoring device of the fourth and fifth features of the present invention, the operating time from when the harmonic content rate exceeds a predetermined value in the output means until a signal is output is designated by the designating means. I am trying. In particular, in the harmonic content rate monitoring device of the fifth feature, the operating time designated by the designating means is made to be inversely proportional to the harmonic content rate. As a result, it becomes possible to control the protection according to the characteristics of the device to be protected.
【００２２】[0022]
【実施例】次に、本発明に係る好適な実施例を図面に基
づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments according to the present invention will be described with reference to the drawings.
【００２３】図１に本発明の一実施例に係る高調波含有
率監視装置の構成図を示す。FIG. 1 shows a block diagram of a harmonic content rate monitoring apparatus according to an embodiment of the present invention.
【００２４】図１において、本実施例の高調波含有率監
視装置は、検出手段である変流器（ＣＴ）１１及びサン
プリングホールド（Sampling-hold ）回路１２、分解手
段であるＡ／Ｄ変換回路１３及びＦＦＴ（Fast Fourier
Transformer）演算器１４、高調波含有率算出手段であ
る高調波含有率計算回路１５、指定手段である反限時特
性動作機能回路１６及び入力回路１８、及び出力手段で
ある出力回路１７及び表示器１９を備えている。Referring to FIG. 1, the harmonic content rate monitoring apparatus of this embodiment comprises a current transformer (CT) 11 as a detection means, a sampling and holding (Sampling-hold) circuit 12, and an A / D conversion circuit as a decomposition means. 13 and FFT (Fast Fourier
Transformer) arithmetic unit 14, harmonic content rate calculation circuit 15 which is a harmonic content rate calculation means, anti-delay characteristic operation function circuit 16 and input circuit 18 which is a specification means, and output circuit 17 which is an output means and a display unit 19. Is equipped with.
【００２５】検出手段は系統の電流を検出する。つま
り、変流器（ＣＴ）１１によって系統の幹線１０から電
流を導き、サンプリングホールド回路１２によって所定
サンプリング周期のサンプリング計測を行う。例えば、
サンプリング周期は約１［秒］で、１周期３２回のサン
プリング計測を行う。The detection means detects the current of the system. In other words, the current transformer (CT) 11 guides a current from the main line 10 of the system, and the sampling and holding circuit 12 performs sampling measurement at a predetermined sampling period. For example,
The sampling cycle is about 1 second, and sampling measurement is performed 32 times per cycle.
【００２６】分解手段は、系統の電流について各次の調
波電流に分解する。つまり、Ａ／Ｄ変換回路１３によっ
てアナログ値をディジタル値に変換し、ＦＦＴ演算器１
４による高速フーリエ変換によって、例えば第２次〜第
１３次の各次数の高調波成分に分解する。The disassembling means decomposes the system current into harmonic currents of respective orders. That is, the A / D conversion circuit 13 converts an analog value into a digital value, and the FFT calculator 1
By Fast Fourier Transform according to 4, for example, it is decomposed into second-order to thirteenth-order harmonic components.
【００２７】高調波含有率算出手段は、検出電流に含ま
れる基本波電流に対する高調波電流の割合（高調波含有
率）を算出する。つまり、高調波含有率計算回路１５に
よって、基本波電流値に対する高調波電流値の割合（高
調波含有率）を計算する。尚、計算は基本波電流及び高
調波電流の実効値により行われる。The harmonic content rate calculating means calculates a ratio of the harmonic current to the fundamental wave current included in the detected current (harmonic content rate). That is, the harmonic content rate calculation circuit 15 calculates the ratio of the harmonic current value to the fundamental wave current value (harmonic content rate). The calculation is performed by the effective values of the fundamental current and the harmonic current.
【００２８】高調波含有率計算回路１５における計算式
は、単一次数の高調波電流実効値で除するもの、複数次
数の高調波電流実効値を基本波電流実効値で除するも
の、基本波を含む高調波電流実効値を基本波電流実効値
で除するもの、等々から選んで設定することが可能であ
る。The calculation formula in the harmonic content rate calculating circuit 15 is as follows: the harmonic current effective value of a single order is divided, the harmonic current effective value of a plurality of orders is divided by the fundamental wave effective value, and the fundamental wave is calculated. It is possible to select and set the effective current value of the harmonic current including the value that is divided by the effective value of the fundamental wave current.
【００２９】指定手段は、出力手段における高調波含有
率の所定値超過から信号出力するまでの動作時間を指定
する。つまり、予め反限時特性動作機能回路１６に出力
手段の動作特性を保持させておき、入力回路１８から当
該系統の管理者が設定する。保持される動作特性は、連
続許容の反限時特性（図２（ａ）参照）、瞬時特性（図
２（ｂ）参照）等がある。例えば図２（ａ）に示す反限
時特性の場合には、整定値の１１０［％］以上で動作
し、動作時間は、３００［％］負荷で１〜３２［秒］の
範囲で指定できる。また、図２（ｂ）に示す瞬時特性の
場合には、整定値の１１０［％］以上で動作し、動作時
間は、超過後０〜１２０［秒］の範囲で指定できる。The designating means designates the operation time from the output of the harmonic content rate exceeding the predetermined value to the signal output. In other words, the anti-time limit characteristic operation function circuit 16 is made to hold the operation characteristic of the output means in advance, and is set by the manager of the system from the input circuit 18. The retained operating characteristics include continuous permissible anti-time limit characteristics (see FIG. 2A) and instantaneous characteristics (see FIG. 2B). For example, in the case of the anti-time limit characteristic shown in FIG. 2A, the operation is performed at 110% or more of the set value, and the operation time can be specified in the range of 1 to 32 [seconds] at a load of 300%. In the case of the instantaneous characteristics shown in FIG. 2B, the operation is performed at 110% or more of the set value, and the operation time can be specified in the range of 0 to 120 seconds after the operation.
【００３０】出力手段は、所定の調波について高調波含
有率が所定値以上の場合に、系統の所定の機器を開放制
御する旨の信号を出力する。つまり、出力回路１７から
開放制御信号ｃｏを出力し、表示器１９には幹線１０に
おける電流瞬時値、高調波成分の瞬時値、及び高調波含
有率等の表示、並びに、開放制御信号ｃｏを出力して保
護動作を行う場合のエラー表示等が表示される。The output means outputs a signal for controlling the opening of a predetermined device of the system when the harmonic content rate of the predetermined harmonic is equal to or higher than a predetermined value. That is, the output circuit 17 outputs the open control signal co, the display unit 19 displays the instantaneous current value of the main line 10, the instantaneous value of the harmonic component, the harmonic content rate, and the like, and outputs the open control signal co. Then, an error display or the like when the protection operation is performed is displayed.
【００３１】なお、出力手段が保護動作を行って所定時
間経過後に自動的に元の状態に復帰する限時復帰機能を
持たせてもよい。復帰動作時限は、例えば０〜９０
［分］であり、設定により手動リセットを選択できるよ
うにすることも可能である。また出力回路１７は、動作
後の限時復帰機能を外部の限時動作機器で置き換えるも
のであってもよい。Note that the output means may be provided with a time-delaying function of automatically performing a protective operation and automatically returning to the original state after a lapse of a predetermined time. The return operation time limit is, for example, 0 to 90.
It is [minutes], and manual reset can be selected by setting. The output circuit 17 may replace the time delay function after operation with an external time delay device.
【００３２】以上のように、本実施例の高調波含有率監
視装置では、高調波電流値を直接監視せずに、基本波電
流値に対する高調波電流値の割合（高調波含有率）を監
視して、系統に具備される不特定数のコンデンサ等の機
器を高調波過電流から保護することが可能である。As described above, in the harmonic content rate monitoring device of this embodiment, the ratio of the harmonic current value to the fundamental wave current value (harmonic content rate) is monitored without directly monitoring the harmonic current value. Thus, it is possible to protect an unspecified number of devices such as capacitors included in the system from harmonic overcurrent.
【００３３】また、従来技術において高調波保護に使用
した高調波過電流リレーでは、個々の負荷に対して１個
のリレーを必要としたが、本実施例の高調波含有率監視
装置を各負荷に接続される幹線１０に接続して使用する
ことにより、複数の負荷回路に対して１個の高調波含有
率監視装置で、該監視装置以下に繋がる複数の負荷を高
調波過電流の災害から保護することができる。Further, in the harmonic overcurrent relay used for the harmonic protection in the prior art, one relay is required for each load, but the harmonic content rate monitoring device of this embodiment is used for each load. By using it by connecting it to the main line 10 which is connected to, a single harmonic content rate monitoring device for a plurality of load circuits, and a plurality of loads connected below the monitoring device can be protected from a disaster of harmonic overcurrent. Can be protected.
【００３４】図３は、本実施例の高調波含有率監視装置
を適用した電力系統の構成図であり、この電力系統は、
コンデンサバンクを４回路備えて系統の力率制御を行う
構成を有しいる。図３には、コンデンサ回路を開閉する
開閉器１−１〜１−４、高調波含有率監視装置２、直列
リアクトル３−１〜３−４、コンデンサ４−１〜４−
４、力率を検出して力率が設定された範囲に収まるよう
に開閉器１を制御する機能を備えた力率調整装置５、及
び高調波含有率監視装置２が監視する幹線１０が示され
ている。FIG. 3 is a block diagram of an electric power system to which the harmonic content rate monitoring apparatus of this embodiment is applied.
It has a configuration in which four circuits of capacitor banks are provided to control the power factor of the system. In FIG. 3, switches 1-1 to 1-4 for opening and closing the capacitor circuit, a harmonic content rate monitoring device 2, a series reactor 3-1 to 3-4, and capacitors 4-1 to 4-.
4, a power factor adjusting device 5 having a function of detecting the power factor and controlling the switch 1 so that the power factor falls within a set range, and a main line 10 monitored by the harmonic content rate monitoring device 2 are shown. Has been done.
【００３５】本適用例の電力系統では、コンデンサ４−
１〜４−４及び直列リアクトル３−１〜３−４の４つの
コンデンサ回路に対して、それぞれ開閉器１−１〜１−
４を備え、力率調整装置５による力率調整制御、並びに
高調波含有率監視装置２による高調波電流の監視に基づ
き開閉器１−１〜１−４の開閉制御が行われる。In the power system of this application example, the capacitor 4-
1 to 4-4 and series reactors 3-1 to 3-4, four switches, switches 1-1 to 1-
4, the switching control of the switches 1-1 to 1-4 is performed based on the power factor adjustment control by the power factor adjustment device 5 and the monitoring of the harmonic current by the harmonic content rate monitoring device 2.
【００３６】つまり、自動力率調整動作では、力率を希
望の範囲に制御するために、力率制御装置５が当該系統
の力率を検出して、必要に応じて開閉器１−１〜１−４
を自動的に開閉する。That is, in the automatic power factor adjustment operation, in order to control the power factor within a desired range, the power factor control device 5 detects the power factor of the relevant system, and switches 1-1 to 1-1 as necessary. 1-4
To open and close automatically.
【００３７】高調波電流が流入し、高調波電流含有率が
規定された範囲を超過したことを高調波含有率監視装置
２が検出して予め設定された時間だけ経過すると、出力
手段から力率調整装置５に開放制御信号ｃｏが出力さ
れ、力率調整装置は開閉器１−１〜１−４を開放して過
度の高調波電流による損傷を防止する。When the harmonic content rate monitoring device 2 detects that the harmonic current flows in and the harmonic current content rate exceeds the specified range and a preset time elapses, the power factor is output from the output means. The opening control signal co is output to the adjusting device 5, and the power factor adjusting device opens the switches 1-1 to 1-4 to prevent damage due to excessive harmonic current.
【００３８】負荷回路（４つのコンデンサ回路）を開放
した後、設定された時限を経過すると、高調波含有率監
視装置２は制御信号を出力して開閉器１−１〜１−４を
投入し、当該電力系統は前述の自動力率調整動作に入
る。After the load circuit (four capacitor circuits) is opened, when the set time period elapses, the harmonic content rate monitoring device 2 outputs a control signal to turn on the switches 1-1 to 1-4. The power system enters the above-described automatic power factor adjustment operation.
【００３９】なお、本適用例では、高調波含有率監視装
置２の出力（開放制御信号ｃｏ）を力率調整装置５に出
力して、力率調整装置５が開閉器１−１〜１−４を開放
する如く説明したが、高調波含有率監視装置２の出力で
開閉器１−１〜１−４を直接的に開放及び投入制御する
よう構成しても同様の効果を奏することは自明である。In this application example, the output of the harmonic content rate monitoring device 2 (opening control signal co) is output to the power factor adjusting device 5, and the power factor adjusting device 5 switches the switches 1-1 to 1-. Although it has been described that the switch No. 4 is opened, it is obvious that the same effect can be achieved even if the switches 1-1 to 1-4 are directly opened and controlled by the output of the harmonic content rate monitoring device 2. Is.
【００４０】従来では、保護すべき回路の数だけ高調波
保護を行うための高調波過電流リレー２−１〜２−４を
必要としたのに対し、本実施例の適用例では、保護すべ
き回路の数が多くても必要とする高調波含有率監視装置
２は１台でよい。このことは新設盤でのリレーの取付ス
ペースが少なくてよく、配線本数が少なく、配線工事時
間も短く、器具価格が安価で済むというように多くの効
果を奏する。また、既設盤に高調波保護機能を追加する
改修工事においては、特に大きな利点となる。Conventionally, the harmonic overcurrent relays 2-1 to 2-4 for performing the harmonic protection are required for the number of circuits to be protected, whereas in the application example of this embodiment, they are protected. Even if the number of power circuits is large, only one harmonic content rate monitoring device 2 is required. This has many advantages such as a small installation space for the relay on a new board, a small number of wires, a short wiring work time, and a low equipment price. In addition, it will be a great advantage especially in the renovation work to add the harmonic protection function to the existing board.
【００４１】[0041]
【発明の効果】以上説明したように、本発明によれば、
検出手段により系統（例えば、系統における複数の機器
に接続される幹線の）電流を検出し、該電流に含まれる
基本波電流に対する高調波電流の割合（高調波含有率）
を高調波含有率算出手段によって算出し、高調波含有率
が所定値以上の場合に、出力手段から系統の所定の機器
を開放制御する旨の信号を出力することとし、また高調
波電流値を直接監視せず高調波含有率を監視して、不特
定数のコンデンサ等の機器を高調波過電流から保護する
こととしたので、当該１個の高調波含有率監視装置によ
り複数の機器を高調波過電流から保護することが可能と
なる。As described above, according to the present invention,
The detection means detects the current of the grid (for example, the main line connected to a plurality of devices in the grid), and the ratio of the harmonic current to the fundamental current included in the current (harmonic content rate)
Is calculated by the harmonic content rate calculation means, and when the harmonic content rate is equal to or higher than a predetermined value, the output means outputs a signal for controlling the opening of a predetermined device of the system, and the harmonic current value is Since it was decided to monitor the harmonic content rate without directly monitoring it and to protect equipment such as an unspecified number of capacitors from harmonic overcurrents, a single harmonic content rate monitoring device should be used to It becomes possible to protect from wave overcurrent.
【００４２】また、装置全体の体積効率及びコスト効率
に優れた、更には系統の改修工事を容易に行い得る高調
波含有率監視装置を提供することが可能となる。Further, it is possible to provide a harmonic content rate monitoring device which is excellent in volumetric efficiency and cost efficiency of the entire device and which can easily perform system repair work.
【００４３】また、本発明によれば、検出手段で検出し
た系統の電流について、分解手段により各次の調波電流
に分解し、高調波含有率算出手段により各次または所定
の調波について高調波含有率を算出し、出力手段によっ
て所定の調波について高調波含有率が所定値以上の場合
に、系統の所定の機器を開放制御する旨の信号を出力す
ることとしたので、各次の調波電流に対して極めの細か
い高調波保護を行い得る高調波含有率監視装置を提供す
ることが可能となる。Further, according to the present invention, the system current detected by the detection means is decomposed into harmonic currents of respective orders by the decomposition means, and harmonics of the respective orders or predetermined harmonics are calculated by the harmonic content calculating means. The wave content rate is calculated, and when the harmonic content rate for a predetermined harmonic is greater than or equal to a predetermined value by the output means, it is decided to output a signal to control the opening of a predetermined device of the system. It is possible to provide a harmonic content rate monitoring device capable of performing extremely fine harmonic protection against a harmonic current.
【００４４】また、本発明によれば、出力手段における
高調波含有率の所定値超過から信号出力するまでの動作
時間を指定手段により指定することとし、指定手段が指
定する動作時間を例えば高調波含有率に反比例させるこ
ととしたので、保護対象の機器の特性に応じた保護の制
御が可能な高調波含有率監視装置を提供することが可能
となる。Further, according to the present invention, the operating time from the output of the harmonic content rate exceeding the predetermined value to the signal output is designated by the designating means, and the operating time designated by the designating means is, for example, the harmonic. Since it is made inversely proportional to the content rate, it is possible to provide a harmonic content rate monitoring device capable of controlling protection according to the characteristics of the equipment to be protected.
【図１】本発明に係る高調波含有率監視装置の一実施例
を示した構成図である。FIG. 1 is a configuration diagram showing an embodiment of a harmonic content rate monitoring device according to the present invention.
【図２】本実施例の反限時特性動作機能回路に保持され
る出力手段の動作特性を示した図であり、（ａ）は反時
限特性、（ｂ）は瞬時特性をそれぞれ示した図である。2A and 2B are diagrams showing the operation characteristics of the output means held in the anti-time limit characteristic operation function circuit of the present embodiment, wherein FIG. 2A is an anti-time characteristic and FIG. 2B is an instantaneous characteristic. is there.
【図３】本実施例の高調波含有率監視装置を適用した電
力系統の構成図である。FIG. 3 is a configuration diagram of a power system to which the harmonic content rate monitoring device according to the present embodiment is applied.
【図４】従来の電力系統の構成図である。FIG. 4 is a configuration diagram of a conventional power system.
１−１〜１−４ 開閉器 ２ 高調波含有率監視装置 ３−１〜３−４ 直列リアクトル ４−１〜４−４ コンデンサ ５ 力率調整装置 １０ 幹線 １１ 変流器（ＣＴ） １２ サンプリングホールド回路 １３ Ａ／Ｄ変換回路 １４ ＦＦＴ演算器 １５ 高調波含有率計算回路 １６ 反限時特性動作機能回路 １７ 出力回路 １８ 入力回路 １９ 表示器 １０２−１〜１０２−４ 高調波過電流リレー ｃｏ 開放制御信号 1-1 to 1-4 Switch 2 Harmonic content rate monitoring device 3-1 to 3-4 Series reactor 4-1 to 4-4 Capacitor 5 Power factor adjusting device 10 Main line 11 Current transformer (CT) 12 Sampling hold Circuit 13 A / D conversion circuit 14 FFT calculator 15 Harmonic content rate calculation circuit 16 Reverse time characteristic operation function circuit 17 Output circuit 18 Input circuit 19 Indicators 102-1 to 102-4 Harmonic overcurrent relay co Open control signal
Claims (5)
（高調波含有率）を算出する高調波含有率算出手段と、 前記高調波含有率が所定値以上の場合に、前記系統の所
定の機器を開放制御する旨の信号を出力する出力手段
と、 を有することを特徴とする高調波含有率監視装置。1. A detection means for detecting a system current, a harmonic content rate calculation means for calculating a ratio (harmonic content rate) of a harmonic current to a fundamental current included in the current, and the harmonic content. A harmonic content rate monitoring device, comprising: an output unit that outputs a signal for controlling the opening of a predetermined device of the system when the ratio is equal to or higher than a predetermined value.
おいて、 前記検出手段は、前記複数の機器に接続される幹線の電
流を検出することを特徴とする高調波含有率監視装置。2. The harmonic content rate monitoring device according to claim 1, wherein the detecting unit detects a current of a main line connected to the plurality of devices.
視装置において、 系統の電流について各次の調波電流に分解する分解手段
を有し、 前記高調波含有率算出手段は、各次または所定の調波に
ついて高調波含有率を算出し、 前記出力手段は、所定の調波について前記高調波含有率
が所定値以上の場合に、前記系統の所定の機器を開放制
御する旨の信号を出力することを特徴とする高調波含有
率監視装置。3. The harmonic content rate monitoring device according to claim 1, further comprising a disassembling means for disassembling a system current into harmonic currents of respective orders, wherein the harmonic content rate calculating means includes Or, calculating the harmonic content rate for a predetermined harmonic, the output means, when the harmonic content rate for a predetermined harmonic is a predetermined value or more, a signal to the effect that open control of a predetermined device of the system The harmonic content rate monitoring device is characterized by outputting.
装置において、 前記出力手段における高調波含有率の所定値超過から信
号出力するまでの動作時間を指定する指定手段を有する
ことを特徴とする高調波含有率監視装置。4. The harmonic content rate monitoring device according to claim 1, further comprising designating means for designating an operation time from when the harmonic content rate of the output means exceeds a predetermined value to when a signal is output. And harmonic content monitoring device.
おいて、 前記指定手段が指定する動作時間は、高調波含有率に反
比例することを特徴とする高調波含有率監視装置。5. The harmonic content rate monitoring device according to claim 4, wherein the operating time designated by the designating unit is inversely proportional to the harmonic content rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6183216A JPH0843459A (en) | 1994-08-04 | 1994-08-04 | High-harmonic content monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6183216A JPH0843459A (en) | 1994-08-04 | 1994-08-04 | High-harmonic content monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0843459A true JPH0843459A (en) | 1996-02-16 |
Family
ID=16131821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6183216A Pending JPH0843459A (en) | 1994-08-04 | 1994-08-04 | High-harmonic content monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0843459A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08275377A (en) * | 1995-03-30 | 1996-10-18 | Nichicon Corp | Phase-advancing capacitor facility higher harmonic protector |
| JPH08275378A (en) * | 1995-03-30 | 1996-10-18 | Nichicon Corp | Phase-advancing capacitor facility higher harmonic current protector |
| CN103995181A (en) * | 2014-05-13 | 2014-08-20 | 武汉中元华电科技股份有限公司 | Method for analyzing electric energy quality harmonic waves of digital substation |
| CN107796986A (en) * | 2017-11-28 | 2018-03-13 | 国网山东省电力公司龙口市供电公司 | Power transmission network second-harmonic detection device |
| CN108832715A (en) * | 2018-06-14 | 2018-11-16 | 张作夷 | Electric system based on current waveform real-time monitoring |
| US10714936B2 (en) | 2016-02-25 | 2020-07-14 | Kabushiki Kaisha Toshiba | System interconnecting facility |
| CN113219245A (en) * | 2021-03-26 | 2021-08-06 | 南京南瑞继保电气有限公司 | Broadband harmonic detection method and device |
-
1994
- 1994-08-04 JP JP6183216A patent/JPH0843459A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08275377A (en) * | 1995-03-30 | 1996-10-18 | Nichicon Corp | Phase-advancing capacitor facility higher harmonic protector |
| JPH08275378A (en) * | 1995-03-30 | 1996-10-18 | Nichicon Corp | Phase-advancing capacitor facility higher harmonic current protector |
| CN103995181A (en) * | 2014-05-13 | 2014-08-20 | 武汉中元华电科技股份有限公司 | Method for analyzing electric energy quality harmonic waves of digital substation |
| CN103995181B (en) * | 2014-05-13 | 2017-01-18 | 武汉中元华电科技股份有限公司 | Method for analyzing electric energy quality harmonic waves of digital substation |
| US10714936B2 (en) | 2016-02-25 | 2020-07-14 | Kabushiki Kaisha Toshiba | System interconnecting facility |
| CN107796986A (en) * | 2017-11-28 | 2018-03-13 | 国网山东省电力公司龙口市供电公司 | Power transmission network second-harmonic detection device |
| CN108832715A (en) * | 2018-06-14 | 2018-11-16 | 张作夷 | Electric system based on current waveform real-time monitoring |
| CN113219245A (en) * | 2021-03-26 | 2021-08-06 | 南京南瑞继保电气有限公司 | Broadband harmonic detection method and device |
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