JPH09322379A - Overcurrent relay device - Google Patents
Overcurrent relay deviceInfo
- Publication number
- JPH09322379A JPH09322379A JP14152896A JP14152896A JPH09322379A JP H09322379 A JPH09322379 A JP H09322379A JP 14152896 A JP14152896 A JP 14152896A JP 14152896 A JP14152896 A JP 14152896A JP H09322379 A JPH09322379 A JP H09322379A
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- input current
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- Emergency Protection Circuit Devices (AREA)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電力系統における
変圧器回路等の突入電流による誤動作の危険性がある過
電流事故検出などに用いられる過電流継電装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent relay device used for detecting an overcurrent accident which may cause a malfunction due to an inrush current of a transformer circuit in a power system.
【０００２】[0002]
【従来の技術】従来、電力系統における変圧器回路等の
突入電流による誤動作の危険性がある過電流事故検出な
どには、図４のような過電流継電装置４が用いられてい
る。図４に示すように、過電流継電装置４は、入力電流
の基本波成分の値を求める基本波検出手段５と、入力電
流の第２高調波成分の値を求める第２高調波検出手段６
と、基本波検出手段５と第２高調波検出手段６のそれぞ
れにより求められた値から基本波に対する第２高調波の
比を求め、その比が一定値以上であることを検出する第
２高調波含有率検出手段７と、入力電流の値が動作値以
上であるか判定する動作検出手段８と、第２高調波含有
率検出手段７により基本波に対する第２高調波の比が一
定値以上の時に第２高調波成分による出力抑止を検出す
る第２高調波出力抑止検出手段９と、入力電流の値が動
作値以上で第２高調波の出力抑止がない時に事故を検出
する事故検出手段１０とから構成されている。2. Description of the Related Art Conventionally, an overcurrent relay device 4 as shown in FIG. 4 has been used for detecting an overcurrent accident which may cause a malfunction due to an inrush current of a transformer circuit in a power system. As shown in FIG. 4, the overcurrent relay device 4 includes a fundamental wave detecting means 5 for obtaining the value of the fundamental wave component of the input current, and a second harmonic detecting means for obtaining the value of the second harmonic component of the input current. 6
And a second harmonic for obtaining a ratio of the second harmonic to the fundamental wave from the values respectively obtained by the fundamental wave detecting means 5 and the second harmonic detecting means 6, and detecting that the ratio is equal to or more than a certain value. The wave content rate detecting means 7, the operation detecting means 8 for determining whether the value of the input current is the operation value or more, and the second harmonic content rate detecting means 7 make the ratio of the second harmonic to the fundamental wave a certain value or more. Second harmonic output suppression detecting means 9 for detecting the output suppression by the second harmonic component at the time of, and accident detecting means for detecting an accident when the input current value is equal to or higher than the operation value and the output of the second harmonic is not suppressed. It is composed of 10 and.
【０００３】上記したように、この過電流継電装置４
は、系統の電流を入力し基本波検出手段５から入力電流
の基本波成分の値を、第２高調波検出手段６から入力電
流の第２高調波成分の値を求め、その基本波成分と第２
高調波成分から第２高調波含有率検出手段７により基本
波に対する第２高調波の比が一定値以上でないと検出さ
れた時は、第２高調波出力抑止検出手段９により第２高
調波成分による出力抑止機能が検出されず、動作検出手
段８で入力電流が動作値以上であると検出されれば事故
検出手段１０により事故検出の出力をするものである。As described above, this overcurrent relay device 4
Is the fundamental current component of the input current from the fundamental wave detecting means 5 and the value of the second harmonic component of the input current from the second harmonic detecting means 6 Second
If the second harmonic content rate detecting means 7 detects that the ratio of the second harmonic to the fundamental wave is not higher than a certain value from the harmonic components, the second harmonic output suppression detecting means 9 causes the second harmonic component. If the output restraining function by (3) is not detected and the input current is detected by the operation detecting means 8 as being equal to or higher than the operation value, the accident detecting means 10 outputs an accident detection output.
【０００４】また逆に、第２高調波含有率検出手段７に
より基本波に対する第２高調波の比が一定値以上である
と検出された時は、第２高調波出力抑止検出手段９によ
り第２高調波成分による出力抑止機能が検出され、動作
検出手段８で入力電流が動作値以上であると検出されて
も事故検出手段１０により事故検出の出力が抑止され
る。つまり、突入電流に含まれる第２高調波成分が基本
波に対して一定値以上である時は、入力電流の大きさに
関係なく事故検出の出力が抑止される。On the contrary, when the second harmonic content rate detecting means 7 detects that the ratio of the second harmonic to the fundamental wave is a certain value or more, the second harmonic output suppression detecting means 9 Even if the output detection function by the second harmonic component is detected and the operation detection unit 8 detects that the input current is equal to or more than the operation value, the accident detection unit 10 suppresses the output of the accident detection. That is, when the second harmonic component included in the inrush current is a certain value or more with respect to the fundamental wave, the output of the accident detection is suppressed regardless of the magnitude of the input current.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
過電流継電装置は、電源投入時に事故が発生した場合、
入力電流に突入電流が含まれているため第２高調波成分
が存在し事故検出の出力を抑止するという問題がある。However, in the conventional overcurrent relay device, when an accident occurs when the power is turned on,
Since the inrush current is included in the input current, there is a problem that the second harmonic component exists and the output of the accident detection is suppressed.
【０００６】また、通常の事故であっても、その事故電
流が激しくばらついている時は、その事故電流に第２高
調波成分が存在しているとみなされて、事故検出の出力
を抑止してするという問題がある。Further, even in the case of a normal accident, when the accident current is severely varied, it is considered that the second harmonic component exists in the accident current, and the output of the accident detection is suppressed. There is a problem to do.
【０００７】本発明は、上記問題を解決するためになさ
れたもので、その目的は事故が発生した場合には、電源
投入時でも、事故電流に激しいばらつきがある時でも、
第２高調波の含有率に関係なく、過電流継電装置が誤不
動作せず正常に事故検出できる過電流継電装置を提供す
ることにある。The present invention has been made in order to solve the above problems, and its purpose is, when an accident occurs, even when the power is turned on or when the accident current has a large variation.
It is an object of the present invention to provide an overcurrent relay device which can detect an accident normally without erroneously operating the overcurrent relay device regardless of the content rate of the second harmonic.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の請求項１の過電流継電装置は、系統電流を
入力しその入力電流の基本波成分の値を求める基本波検
出手段と、前記入力電流の前記第２高調波成分の値を求
める第２高調波検出手段と、前記基本波検出手段と第２
高調波検出手段のそれぞれにより求められた基本波に対
する第２高調波の値の比を求め，その比が一定値以上で
あることを検出する第２高調波含有率検出手段と、前記
入力電流の値が動作値以上であることを検出する動作検
出手段と、前記入力電流の値が通常考えられる突入電流
の最大値以上であることを検出する入力電流最大値判定
手段と、前記入力電流の値が突入電流の最大値以下で，
かつ前記第２高調波含有率検出手段により基本波に対す
る第２高調波の値の比が一定値以上の時にのみ第２高調
波成分による出力抑止機能を検出する第２高調波出力抑
止検出手段と、前記動作検出手段により入力電流値が動
作値以上であると検出され，かつ前記第２高調波出力抑
止検出手段で出力を抑止しない時に事故を検出する事故
検出出力判定とから構成されることを特徴とする。In order to achieve the above object, an overcurrent relay device according to claim 1 of the present invention detects a fundamental wave by inputting a system current and obtaining a value of a fundamental wave component of the input current. Means, second harmonic detection means for obtaining a value of the second harmonic component of the input current, the fundamental wave detection means, and second
Second harmonic content rate detecting means for determining the ratio of the value of the second harmonic to the fundamental wave obtained by each of the harmonic detecting means and detecting that the ratio is equal to or greater than a certain value, and the input current An operation detecting means for detecting that the value is equal to or more than an operation value, an input current maximum value determining means for detecting that the value of the input current is equal to or more than the maximum value of the normally considered inrush current, and the value of the input current Is less than the maximum inrush current,
And second harmonic output suppression detecting means for detecting the output suppressing function by the second harmonic component only when the ratio of the value of the second harmonic to the fundamental wave is equal to or more than a certain value by the second harmonic content rate detecting means. And an accident detection output determination for detecting an accident when the input current value is detected to be equal to or higher than the operation value by the operation detection unit and the output is not suppressed by the second harmonic output suppression detection unit. Characterize.
【０００９】本発明の請求項２の過電流継電装置は、系
統の電流を入力しその入力電流の基本波成分の値を求め
る基本波検出手段と、前記入力電流の第２高調波成分の
値を求める第２高調波検出手段と、前記基本波検出手段
と前記第２高調波検出手段のそれぞれにより求められた
値から基本波に対する第２高調波の比を求め，その比が
一定値以上であることを検出する第２高調波含有率検出
手段と、前記入力電流の値が動作値以上であることを検
出する動作検出手段と、外部から電源投入指令を入力
し，その電源投入指令が入力されてから通常突入電流が
安定するまでの間，入力電流を突入電流と判断する突入
電流判定手段と、前記突入電流判定手段で入力電流が突
入電流であると判定され，かつ前記第２高調波含有率検
出手段で基本波に対する第２高調波の比が一定値以上の
時のみ第２高調波成分による出力抑止機能を検出する第
２高調波出力抑止検出手段と、前記動作検出手段により
入力電流値が動作値以上であると検出され，かつ第２高
調波出力抑止検出手段で出力を抑止しない時に事故を検
出する事故検出手段とから構成されることを特徴とす
る。An overcurrent relay device according to a second aspect of the present invention is a fundamental wave detecting means for inputting a system current to obtain a value of a fundamental wave component of the input current, and a second harmonic component of the input current. The ratio of the second harmonic to the fundamental wave is obtained from the values obtained by the second harmonic wave detecting means for obtaining a value and the fundamental wave detecting means and the second harmonic wave detecting means, and the ratio is equal to or more than a certain value. Second harmonic content rate detecting means for detecting that the power supply command is input from the outside, and operation detecting means for detecting that the value of the input current is greater than or equal to the operation value. From the input until the normal inrush current stabilizes, the inrush current determination means determines the input current as the inrush current, and the inrush current determination means determines that the input current is the inrush current, and the second harmonic The fundamental wave is detected by the wave content ratio detection means. The second harmonic output suppression detecting means for detecting the output suppressing function by the second harmonic component only when the ratio of the second harmonics is equal to or more than a constant value, and the input current value is equal to or more than the operation value by the operation detecting means. And an accident detecting means for detecting an accident when the output is not suppressed by the second harmonic output suppression detecting means.
【００１０】本発明の請求項３は、請求項１記載の過電
流継電装置において、外部から電源投入指令を入力し，
その電源投入指令が入力されてから通常突入電流が安定
するまでの間，入力電流を突入電流と判断する突入電流
判定手段と、前記突入電流判定手段で入力電流が突入電
流であると判定され，かつ入力電流の値が通常考えられ
る突入電流の最大値以下であり，さらに基本波に対する
第２高調波の比が一定値以上の時にのみ第２高調波成分
による出力抑止を行う第２高調波出力検出手段とを備え
ていることを特徴とする。According to a third aspect of the present invention, in the overcurrent relay device according to the first aspect, a power-on command is input from the outside,
From the input of the power-on command until the normal inrush current stabilizes, the inrush current determination means determines the input current as the inrush current, and the inrush current determination means determines that the input current is the inrush current. And the second harmonic output that suppresses the output by the second harmonic component only when the input current value is less than the normally considered maximum value of the inrush current and the ratio of the second harmonic to the fundamental wave is more than a certain value. And a detecting means.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を図を
参照して説明する。図１は、本発明の第１実施例（請求
項１対応）の過電流継電装置の構成図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an overcurrent relay device according to a first embodiment (corresponding to claim 1) of the present invention.
【００１２】同図に示すように、本実施例の過電流継電
装置１は、基本波検出手段５と第２高調波検出手段６と
第２高調波含有率検出手段７と入力電流動作判定手段８
と第２高調波出力抑止検出手段９ａと事故検出出力判定
手段１０と入力電流最大値判定手段１１とから構成され
ている。As shown in the figure, the overcurrent relay device 1 of the present embodiment has a fundamental wave detecting means 5, a second harmonic wave detecting means 6, a second harmonic wave content rate detecting means 7, an input current operation judgment. Means 8
And a second harmonic wave output suppression detecting means 9a, an accident detection output judging means 10 and an input current maximum value judging means 11.
【００１３】次に、本実施例の作用について説明する。
系統電流Ｉは、過電流継電装置１に入力され、基本波検
出手段５により入力電流の基本波成分を、また第２高調
波検出手段６により入力電流の第２高調波成分を検出し
た後、第２高調波含有率検出手段７で、基本波検出手段
５と第２高調波検出手段６で検出されたそれぞれの値か
ら基本波に対する第２高調波の比を求め、その比が一定
値以上であることを検出する。Next, the operation of this embodiment will be described.
The system current I is input to the overcurrent relay device 1, and after the fundamental wave detecting means 5 detects the fundamental wave component of the input current and the second harmonic detecting means 6 detects the second harmonic component of the input current. The second harmonic content rate detecting means 7 obtains the ratio of the second harmonic to the fundamental wave from the respective values detected by the fundamental wave detecting means 5 and the second harmonic detecting means 6, and the ratio is a constant value. The above is detected.
【００１４】また、入力電流動作判定手段８により前記
系統電流Ｉが動作値以上であるかを判定し、さらに入力
電流最大値判定手段１１により前記系統電流Ｉからの入
力電流が通常考えられる突入電流の最大値以上であるか
を判定する。Further, the input current operation judging means 8 judges whether the system current I is equal to or more than an operation value, and the input current maximum value judging means 11 further considers the input current from the system current I as a normal rush current. Is greater than or equal to the maximum value of.
【００１５】次に、第２高調波出力抑止検出手段９ａで
は、入力電流最大値判定手段１１により前記系統電流Ｉ
が通常考えられる突入電流の最大値入力電流以下である
と判定し、かつ第２高調波含有率検出手段７より第２高
調波の含有率が一定値以上であると判定された時のみ、
第２高調波による出力抑止機能を動作させる。Next, in the second harmonic output suppression detecting means 9a, the input current maximum value judging means 11 causes the system current I to be detected.
Is determined to be less than or equal to the maximum value of the inrush current, which is usually considered, and only when the second harmonic content rate detection means 7 determines that the second harmonic content rate is equal to or higher than a certain value.
The output suppression function by the second harmonic is activated.
【００１６】さらに、入力電流動作判定手段８で入力電
流が動作値以上と判定され、かつ第２高調波出力抑止検
出手段９ａで第２高調波による出力抑止機能が不動作で
あると判定された時、事故検出出力判定手段１０により
事故検出を出力する。つまり、入力電流の大きさが通常
考えられる突入電流の最大値以下であり、かつその入力
電流の基本波に対する第２高調波の比が一定値以上の
時、第２高調波による出力抑止機能を動作させ、事故検
出の出力を抑止するようにしている。Further, the input current operation determining means 8 determines that the input current is equal to or higher than the operation value, and the second harmonic output suppression detecting means 9a determines that the output suppressing function by the second harmonic is inoperative. At this time, the accident detection output determination means 10 outputs the accident detection. In other words, when the magnitude of the input current is less than the maximum value of the inrush current that is usually considered and the ratio of the second harmonic to the fundamental wave of the input current is a certain value or more, the output suppression function by the second harmonic is performed. It is operated to suppress the output of accident detection.
【００１７】上述したように、本実施例によると、入力
電流の基本波に対する第２高調波の含有率が一定値以上
でない時は、第２高調波による出力抑止機能は働かず、
入力電流の大きさが動作値以上であれば、事故検出出力
をする。また、入力電流の大きさが通常考えられる突入
電流の最大値より大きい時は、第２高調波による出力抑
止機能は働かず、入力電流の大きさが動作値以上であれ
ば、事故検出出力をする。As described above, according to the present embodiment, when the content rate of the second harmonic with respect to the fundamental wave of the input current is not more than a certain value, the output suppressing function by the second harmonic does not work,
If the magnitude of the input current is greater than the operating value, an accident detection output will be output. Also, when the magnitude of the input current is larger than the normally considered maximum value of the inrush current, the output suppression function by the second harmonic does not work, and if the magnitude of the input current is the operating value or more, the accident detection output is output. To do.
【００１８】さらに、入力電流の大きさが通常考えられ
る突入電流の最大値より小さく、かつ入力電流の基本波
に対する第２高調波の含有率が一定値以上の時は、第２
高調波による出力抑止機能が働き、入力電流の大きさが
動作値以上であっても事故検出出力を抑止する。Further, when the magnitude of the input current is smaller than the normally considered maximum value of the inrush current and the content rate of the second harmonic with respect to the fundamental wave of the input current is a certain value or more, the second
The output suppression function by harmonics works and suppresses the accident detection output even if the magnitude of the input current is above the operating value.
【００１９】図２は、本発明の第２実施例（請求項２対
応）の過電流継電装置の構成図である。同図に示すよう
に、本実施例の過電流継電装置１は、基本波検出手段５
と第２高調波検出手段６と第２高調波含有率検出手段７
と入力電流動作判定手段８と第２高調波出力抑止検出手
段９ｂと事故検出出力判定手段１０と突入電流判定手段
１２とから構成されている。FIG. 2 is a block diagram of an overcurrent relay device according to a second embodiment (corresponding to claim 2) of the present invention. As shown in the figure, the overcurrent relay device 1 according to the present embodiment has a fundamental wave detecting means 5
And second harmonic detecting means 6 and second harmonic content rate detecting means 7
The input current operation determination means 8, the second harmonic output suppression detection means 9b, the accident detection output determination means 10, and the inrush current determination means 12 are included.
【００２０】次に、本実施例の作用について説明する。
系統電流Ｉは、過電流継電装置２に入力され、基本波検
出手段５により入力電流の基本波成分を、また第２高調
波検出手段６により入力電流の第２高調波成分を検出し
た後、第２高調波含有率検出手段７で、基本波検出手段
５と第２高調波検出手段６で検出されたそれぞれの値か
ら基本波に対する第２高調波の比を求め、その比が一定
値以上であることを検出する。Next, the operation of this embodiment will be described.
The system current I is input to the overcurrent relay device 2, and after the fundamental wave component of the input current is detected by the fundamental wave detection unit 5 and the second harmonic component of the input current is detected by the second harmonic detection unit 6. The second harmonic content rate detecting means 7 obtains the ratio of the second harmonic to the fundamental wave from the respective values detected by the fundamental wave detecting means 5 and the second harmonic detecting means 6, and the ratio is a constant value. The above is detected.
【００２１】次に、入力電流動作判定手段８により前記
系統電流Ｉからの入力電流が動作値以上であるかを判定
し、さらに突入電流判定手段１２では外部から電源投入
指令を入力し、その電源投入指令入力から通常突入電流
が安定するまでの間、入力電流を突入電流と判断する。Next, the input current operation determination means 8 determines whether the input current from the system current I is an operation value or more, and the inrush current determination means 12 inputs a power-on command from the outside and supplies the power. The input current is judged to be the inrush current from the input of the closing command until the normal inrush current stabilizes.
【００２２】また、第２高調波出力抑止検出手段９ｂで
は、突入電流判定手段１２により前記系統電流Ｉからの
入力電流がが突入電流であると判断され、かつ第２高調
波含有率検出手段７より第２高調波の含有率が一定値以
上であると判定された時のみ、第２高調波による出力抑
止機能を動作させる。In the second harmonic output suppression detecting means 9b, the inrush current judging means 12 judges that the input current from the system current I is the inrush current, and the second harmonic content rate detecting means 7 Only when it is determined that the content rate of the second harmonic is a certain value or more, the output suppressing function by the second harmonic is operated.
【００２３】さらに、入力電流動作判定手段８で入力電
流が動作値以上と判定され、かつ第２高調波出力抑止検
出手段９ｂで第２高調波による出力抑止機能が不動作で
あると判定された時、事故検出出力判定手段１０により
事故検出を出力する。つまり、外部から電源投入指令を
入力し、その電源投入指令入力から通常突入電流が安定
するまでの間で、かつ入力電流の基本波に対する第２高
調波の比が一定値以上の時、第２高調波による出力抑止
機能を動作させ、事故検出の出力を抑止するようにして
いる。Further, the input current operation determination means 8 determines that the input current is equal to or higher than the operation value, and the second harmonic output suppression detection means 9b determines that the output suppression function by the second harmonic is inoperative. At this time, the accident detection output determination means 10 outputs the accident detection. That is, when the power-on command is input from the outside and the normal inrush current is stabilized after the power-on command is input and the ratio of the second harmonic to the fundamental wave of the input current is equal to or greater than a certain value, the second The output suppression function by harmonics is activated to suppress the accident detection output.
【００２４】上述したように本実施例によると、入力電
流の基本波に対する第２高調波の含有率が一定値以上で
ない時は、第２高調波による出力抑止機能は働かず、入
力電流の大きさが動作値以上であれば、事故検出出力を
する。また外部からの電源投入指令があってから通常突
入電流が安定するまでの間でない時は、第２高調波によ
る出力抑止機能は働かず、入力電流の大きさが動作値以
上であれば、事故検出出力をする。As described above, according to this embodiment, when the content ratio of the second harmonic with respect to the fundamental wave of the input current is not more than a certain value, the output suppressing function by the second harmonic does not work and the input current becomes large. If is greater than the operating value, an accident detection output is given. If the normal inrush current is not stabilized after the power-on command from the outside, the output suppression function by the second harmonic does not work, and if the magnitude of the input current is greater than the operating value, an accident occurs. Outputs detection.
【００２５】さらに、外部からの電源投入指令があって
から通常突入電流が安定するまでの間で、かつ入力電流
の基本波に対する第２高調波の含有率が一定値以上の時
は、第２高調波による出力抑止機能が働き、入力電流の
大きさが動作値以上であっても事故検出出力を抑止す
る。Further, during the period from the external power-on command until the normal inrush current stabilizes, and when the content rate of the second harmonic with respect to the fundamental wave of the input current is a certain value or more, the second The output suppression function by harmonics works and suppresses the accident detection output even if the magnitude of the input current is above the operating value.
【００２６】図３は、本発明の第３実施例（請求項３対
応）の過電流継電装置の構成図である。同図に示すよう
に、本実施例の過電流継電装置３は、基本波検出手段５
と第２高調波検出手段６と第２高調波含有率検出手段７
と入力電流動作判定手段８と第２高調波出力抑止検出手
段９ｃと事故検出出力判定手段１０と入力電流最大値判
定手段１１と突入電流判定手段１２とから構成されてい
る。FIG. 3 is a block diagram of an overcurrent relay device according to a third embodiment (corresponding to claim 3) of the present invention. As shown in the figure, the overcurrent relay device 3 according to the present embodiment has a fundamental wave detecting means 5
And second harmonic detecting means 6 and second harmonic content rate detecting means 7
The input current operation determination means 8, the second harmonic output suppression detection means 9c, the accident detection output determination means 10, the maximum input current value determination means 11 and the inrush current determination means 12 are included.
【００２７】次に、本実施例の作用について説明する。
系統電流Ｉは、過電流継電装置３に入力され、基本波検
出手段５により入力電流の基本波成分を、また第２高調
波検出手段６により入力電流の第２高調波成分を検出し
た後、第２高調波含有率検出手段７で、基本波検出手段
５と第２高調波検出手段６で検出されたそれぞれの値か
ら基本波に対する第２高調波の比を求め、その比が一定
値以上であることを検出する。Next, the operation of the present embodiment will be described.
After the system current I is input to the overcurrent relay device 3, the fundamental wave detecting means 5 detects the fundamental wave component of the input current and the second harmonic detecting means 6 detects the second harmonic component of the input current. The second harmonic content rate detecting means 7 obtains the ratio of the second harmonic to the fundamental wave from the respective values detected by the fundamental wave detecting means 5 and the second harmonic detecting means 6, and the ratio is a constant value. The above is detected.
【００２８】また、入力電流動作判定手段８により前記
系統電流Ｉが動作値以上であるかを判定し、さらに入力
電流最大値判定手段１１により前記系統電流Ｉからの入
力電流が通常考えられる突入電流の最大値以上であるか
を判定する。さらに突入電流判定手段１２では外部から
電源投入指令を入力し、その電源投入指令入力から通常
突入電流が安定するまでの間、入力電流を突入電流と判
断する。Further, the input current operation determining means 8 determines whether the system current I is equal to or more than the operation value, and the input current maximum value determining means 11 further considers the input current from the system current I as a normal rush current. Is greater than or equal to the maximum value of. Further, the inrush current determination means 12 inputs a power-on command from the outside, and determines the input current as the inrush current from the input of the power-on command until the normal inrush current stabilizes.
【００２９】また、第２高調波出力抑止検出手段９ｃで
は、突入電流判定手段１２により前記系統電流Ｉからの
入力電流が突入電流であると判断され、かつ第２高調波
含有率検出手段７により入力電流の基本波に対する第２
高調波の含有率が一定値以上であると判定され、しかも
入力電流最大値判定手段１１により前記系統電流Ｉが通
常考えられる突入電流の最大値入力電流以下であると判
定した時のみ、第２高調波による出力抑止機能を動作さ
せる。In the second harmonic output suppression detecting means 9c, the inrush current determining means 12 determines that the input current from the system current I is an inrush current, and the second harmonic content rate detecting means 7 determines. Second for the fundamental wave of the input current
Only when it is determined that the content rate of harmonics is equal to or higher than a certain value, and the input current maximum value determination means 11 determines that the system current I is equal to or less than the maximum value of the normally considered inrush current input current. Activates the output suppression function due to harmonics.
【００３０】さらに、入力電流動作判定手段８で入力電
流が動作値以上と判定され、かつ第２高調波出力抑止検
出手段９ｃで第２高調波による出力抑止機能が不動作で
あると判定された時、事故検出出力判定手段１０により
事故検出を出力する。つまり、外部から電源投入指令を
入力し、その電源投入指令入力から通常突入電流が安定
するまでの間で、かつ入力電流の大きさが通常考えられ
る突入電流の最大値以下であり、更に入力電流の基本波
に対する第２高調波の比が一定値以上の時、第２高調波
による出力抑止機能を動作させ、事故検出の出力を抑止
するようにしている。Further, the input current operation determination means 8 determines that the input current is the operation value or more, and the second harmonic output suppression detection means 9c determines that the output suppression function by the second harmonic is inoperative. At this time, the accident detection output determination means 10 outputs the accident detection. In other words, when the power-on command is input from the outside and the normal inrush current is stabilized after the power-on command is input, and the magnitude of the input current is less than the maximum value of the normal inrush current, and the input current When the ratio of the second harmonic to the fundamental wave is above a certain value, the output suppression function by the second harmonic is operated to suppress the output of the accident detection.
【００３１】上述したように、本実施例によると、入力
電流の基本波に対する第２高調波の含有率が一定値以上
でない時は、第２高調波による出力抑止機能は働かず、
入力電流の大きさが動作値以上であれば、事故検出出力
をする。また外部からの電源投入指令があってから通常
突入電流が安定するまでの間でない時は、入力電流の基
本波に対する第２高調波の含有率に関係なく第２高調波
による出力抑止機能は働かず、入力電流の大きさが動作
値以上であれば、事故検出出力をする。As described above, according to the present embodiment, when the content rate of the second harmonic with respect to the fundamental wave of the input current is not more than a certain value, the output suppressing function by the second harmonic does not work,
If the magnitude of the input current is greater than the operating value, an accident detection output will be output. In addition, if it is not during the period from the external power-on command until the normal inrush current stabilizes, the output suppression function by the second harmonic will work regardless of the content ratio of the second harmonic to the fundamental wave of the input current. If the magnitude of the input current is not less than the operating value, the fault detection output is output.
【００３２】また、入力電流の大きさが通常考えられる
突入電流の最大値より大きい時は、第２高調波による出
力抑止機能は働かず、入力電流の大きさが動作値以上で
あれば、事故検出出力をする。Further, when the magnitude of the input current is larger than the maximum value of the inrush current which is usually considered, the output suppressing function by the second harmonic does not work, and when the magnitude of the input current is the operating value or more, an accident occurs. Outputs detection.
【００３３】さらに、外部からの電源投入指令があって
から通常突入電流が安定するまでの間で、かつ入力電流
の大きさが通常考えられる突入電流の最大値より小さ
く、更に入力電流の基本波に対する第２高調波の含有率
が一定値以上である時は、第２高調波による出力抑止機
能が働き、入力電流の大きさが動作値以上であっても事
故検出出力を抑止する。Further, during the period from the power-on command from the outside until the normal inrush current stabilizes, the magnitude of the input current is smaller than the normally considered maximum value of the inrush current, and the fundamental wave of the input current is further increased. When the content rate of the second harmonic is above a certain value, the output restraining function by the second harmonic works and restrains the accident detection output even when the magnitude of the input current is above the operating value.
【００３４】[0034]
【発明の効果】以上説明したように、本発明の請求項１
によると、入力電流の基本波に対する第２高調波の含有
率が一定値以上でも、その入力電流の大きさが通常考え
られる突入電流の最大値より大きければ、第２高調波に
よる出力抑止機能は働かず、正常な事故検出を行う。つ
まり、電源投入時に事故が発生した場合、入力電流の大
きさは突入電流と事故電流とが加えられた大きさであ
り、通常考えられる突入電流の最大値より大きいため、
第２高調波の含有率がいくらであっても、第２高調波に
よる出力抑止機能は働かず、正常な事故検出を行う。As described above, according to the first aspect of the present invention.
According to the above, even if the content rate of the second harmonic with respect to the fundamental wave of the input current is a certain value or more, if the magnitude of the input current is larger than the maximum value of the inrush current that is usually considered, the output suppression function by the second harmonic is Does not work and performs normal accident detection. In other words, when an accident occurs when the power is turned on, the magnitude of the input current is the sum of the inrush current and the fault current, which is larger than the maximum value of the inrush current that is usually considered.
No matter how much the second harmonic content is, the output suppression function by the second harmonic does not work, and normal accident detection is performed.
【００３５】本発明の請求項２によると、入力電流が急
激なばらつきのある事故電流であり、突入電流のように
見えても、外部からの電源投入指令入力から通常突入電
流が安定するまでの間でなければ、第２高調波による出
力抑止機能は働かず、正常な事故検出を行う。つまり、
通常の事故電流に急激なばらつきがあって、見かけ上突
入電流のように見えても、第２高調波による出力抑止機
能は働かず、正常な事故検出を行う。According to the second aspect of the present invention, the input current is a fault current with abrupt variations, and even if the input current looks like an inrush current, from the power-on command input from the outside until the normal inrush current stabilizes. If it is not in the interval, the output suppression function by the second harmonic does not work, and normal accident detection is performed. That is,
Even if the normal fault current has a sudden variation and looks like an inrush current, the output suppression function by the second harmonic does not work and the fault is detected normally.
【００３６】本発明の請求項３によると、入力電流の基
本波に対する第２高調波の含有率が一定値以上でも、そ
の入力電流の大きさが通常考えられる突入電流の最大値
より大きい場合や、また外部からの電源投入指令入力か
ら通常突入電流が安定するまでの間でない場合は、第２
高調波による出力抑止機能は働かず、正常な事故検出を
行う。つまり、電源投入時に事故が発生した場合や、ま
た電源投入から通常突入電流が安定するまでの間でない
場合、第２高調波による出力抑止機能は働かず、正常な
事故検出を行う。According to the third aspect of the present invention, even if the content ratio of the second harmonic with respect to the fundamental wave of the input current is a certain value or more, the magnitude of the input current is larger than the normally considered maximum value of the inrush current. If it is not during the period from the power-on command input from the outside until the normal inrush current stabilizes, the second
The output suppression function by harmonics does not work, and normal accident detection is performed. In other words, if an accident occurs when the power is turned on, or if it is not between the time when the power is turned on and the normal inrush current stabilizes, the output suppression function based on the second harmonic does not work and normal accident detection is performed.
【図１】本発明の第１実施例の構成図。FIG. 1 is a configuration diagram of a first embodiment of the present invention.
【図２】本発明の第２実施例の構成図。FIG. 2 is a configuration diagram of a second embodiment of the present invention.
【図３】本発明の第３実施例の構成図。FIG. 3 is a configuration diagram of a third embodiment of the present invention.
【図４】従来の過電流継電装置の構成図。FIG. 4 is a configuration diagram of a conventional overcurrent relay device.
１，２，３，４…過電流継電装置、５…基本波検出手
段、６…第２高調波検出手段、７…第２高調波含有率検
出手段、８…入力電流動作判定手段、９，９ａ，９ｂ，
９ｃ…第２高調波出力抑止検出手段、１０…事故検出出
力判定手段、１１…入力電流最大値判定手段、１２…突
入電流判定手段。1, 2, 3, 4 ... Overcurrent relay device, 5 ... Fundamental wave detecting means, 6 ... Second harmonic wave detecting means, 7 ... Second harmonic wave content rate detecting means, 8 ... Input current operation judging means, 9 , 9a, 9b,
9c ... Second harmonic output suppression detection means, 10 ... accident detection output determination means, 11 ... input current maximum value determination means, 12 ... inrush current determination means.
Claims (3)
成分の値を求める基本波検出手段と、前記入力電流の第
２高調波成分の値を求める第２高調波検出手段と、前記
基本波検出手段と前記第２高調波検出手段のそれぞれに
より求められた基本波に対する第２高調波の値の比を求
め，その比が一定値以上であることを検出する第２高調
波含有率検出手段と、前記入力電流の値が動作値以上で
あることを検出する動作検出手段と、前記入力電流の値
が通常考えられる突入電流の最大値以上であることを検
出する入力電流最大値判定手段と、前記入力電流の値が
突入電流の最大値以下で，かつ前記第２高調波含有率検
出手段により基本波に対する第２高調波の値の比が一定
値以上の時にのみ第２高調波成分による出力抑止機能を
検出する第２高調波出力抑止検出手段と、前記動作検出
手段により入力電流値が動作値以上であると検出され，
かつ前記第２高調波出力抑止検出手段で出力を抑止しな
い時に事故を検出する事故検出出力判定とから構成され
ることを特徴とする過電流継電装置。1. A fundamental wave detecting means for inputting a system current and obtaining a value of a fundamental wave component of the input current, a second harmonic detecting means for obtaining a value of a second harmonic component of the input current, and the fundamental. Second harmonic content rate detection for obtaining the ratio of the value of the second harmonic to the fundamental wave obtained by each of the wave detecting means and the second harmonic detecting means, and detecting that the ratio is equal to or greater than a certain value Means, operation detecting means for detecting that the value of the input current is greater than or equal to the operation value, and input current maximum value determining means for detecting that the value of the input current is greater than or equal to the maximum value of the normally considered inrush current. And the second harmonic component only when the value of the input current is less than or equal to the maximum value of the inrush current and the ratio of the value of the second harmonic to the fundamental wave is greater than or equal to a certain value by the second harmonic content rate detecting means. Second harmonic to detect the output suppression function by The output suppression detection means and the operation detection means detect that the input current value is greater than or equal to the operation value,
And an accident detection output judgment for detecting an accident when the output is not suppressed by the second harmonic output suppression detecting means.
波成分の値を求める基本波検出手段と、前記入力電流の
第２高調波成分の値を求める第２高調波検出手段と、前
記基本波検出手段と前記第２高調波検出手段のそれぞれ
により求められた値から基本波に対する第２高調波の比
を求め，その比が一定値以上であることを検出する第２
高調波含有率検出手段と、前記入力電流の値が動作値以
上であることを検出する動作検出手段と、外部から電源
投入指令を入力し，その電源投入指令が入力されてから
通常突入電流が安定するまでの間，入力電流を突入電流
と判断する突入電流判定手段と、前記突入電流判定手段
で入力電流が突入電流であると判定され，かつ前記第２
高調波含有率検出手段で基本波に対する第２高調波の比
が一定値以上の時のみ第２高調波成分による出力抑止機
能を検出する第２高調波出力抑止検出手段と、前記動作
検出手段により入力電流値が動作値以上であると検出さ
れ，かつ第２高調波出力抑止検出手段で出力を抑止しな
い時に事故を検出する事故検出手段とから構成されるこ
とを特徴とする過電流継電装置。2. A fundamental wave detecting means for inputting a system current and obtaining a value of a fundamental wave component of the input current; a second harmonic detecting means for obtaining a value of a second harmonic component of the input current; A second harmonic ratio is calculated from the values obtained by the fundamental wave detecting means and the second harmonic detecting means, respectively, and the ratio is detected to be a certain value or more.
Harmonic content ratio detection means, operation detection means for detecting that the value of the input current is greater than or equal to an operation value, and a power-on command is input from the outside, and the normal rush current is detected after the power-on command is input. Until it stabilizes, the inrush current determination means determines the input current as the inrush current, and the inrush current determination means determines that the input current is the inrush current, and the second current
The second harmonic output suppression detection means for detecting the output suppression function by the second harmonic component only when the ratio of the second harmonic to the fundamental wave is a certain value or more by the harmonic content detection means, and the operation detection means. An overcurrent relay device comprising: an accident detection unit that detects an accident when an input current value is detected to be equal to or higher than an operation value and an output is not suppressed by the second harmonic output suppression detection unit. .
て、外部から電源投入指令を入力し，その電源投入指令
が入力されてから通常突入電流が安定するまでの間，入
力電流を突入電流と判断する突入電流判定手段と、前記
突入電流判定手段で入力電流が突入電流であると判定さ
れ，かつ入力電流の値が通常考えられる突入電流の最大
値以下であり，さらに基本波に対する第２高調波の比が
一定値以上の時にのみ第２高調波成分による出力抑止を
行う第２高調波出力検出手段とを備えていることを特徴
とする過電流継電装置。3. The overcurrent relay device according to claim 1, wherein a power-on command is input from the outside, and the input current is inrush current until the normal inrush current stabilizes after the power-on command is input. And an inrush current determining means that determines that the input current is an inrush current, and the value of the input current is less than or equal to the normally considered maximum value of the inrush current. An overcurrent relay device, comprising: a second harmonic output detecting means for suppressing output by the second harmonic component only when the ratio of the harmonics is a certain value or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14152896A JP3316133B2 (en) | 1996-06-04 | 1996-06-04 | Overcurrent relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14152896A JP3316133B2 (en) | 1996-06-04 | 1996-06-04 | Overcurrent relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09322379A true JPH09322379A (en) | 1997-12-12 |
| JP3316133B2 JP3316133B2 (en) | 2002-08-19 |
Family
ID=15294074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14152896A Expired - Fee Related JP3316133B2 (en) | 1996-06-04 | 1996-06-04 | Overcurrent relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3316133B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090392A (en) * | 2000-09-19 | 2002-03-27 | Toshiba Corp | Measuring device for average current in electric power system |
| EP3157112A1 (en) * | 2015-10-12 | 2017-04-19 | General Electric Technology GmbH | Improvements in or relating to the protection of power transformers |
-
1996
- 1996-06-04 JP JP14152896A patent/JP3316133B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090392A (en) * | 2000-09-19 | 2002-03-27 | Toshiba Corp | Measuring device for average current in electric power system |
| EP3157112A1 (en) * | 2015-10-12 | 2017-04-19 | General Electric Technology GmbH | Improvements in or relating to the protection of power transformers |
| WO2017064148A1 (en) * | 2015-10-12 | 2017-04-20 | General Electric Technology Gmbh | Improvements in or relating to the protection of power transformers |
| US20180294640A1 (en) * | 2015-10-12 | 2018-10-11 | General Electric Technology Gmbh | Improvements in or relating to the protection of power transformers |
| JP2019504602A (en) * | 2015-10-12 | 2019-02-14 | ゼネラル エレクトリック テクノロジー ゲゼルシャフト ミット ベシュレンクテル ハフツングＧｅｎｅｒａｌ Ｅｌｅｃｔｒｉｃ Ｔｅｃｈｎｏｌｏｇｙ ＧｍｂＨ | Improved or related protection for power transformers |
| US10916932B2 (en) | 2015-10-12 | 2021-02-09 | General Electric Technology Gmbh | Protection of power transformers |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3316133B2 (en) | 2002-08-19 |
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