JPS61157222A - Current differential protective relay device - Google Patents
Current differential protective relay deviceInfo
- Publication number
- JPS61157222A JPS61157222A JP27471084A JP27471084A JPS61157222A JP S61157222 A JPS61157222 A JP S61157222A JP 27471084 A JP27471084 A JP 27471084A JP 27471084 A JP27471084 A JP 27471084A JP S61157222 A JPS61157222 A JP S61157222A
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- Prior art keywords
- current
- inspection
- input
- current differential
- bus
- 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.)
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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は母線保護装置の如く複数OCTから入力量を導
入して電流差動方式を適用する保護継電装置に係シ、特
に入力変換器および電流差動リレーの不良を検出する常
時監視及び自動点検を簡単に行なうことの可能な電流差
動保護継電装置に関するものでおる。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a protective relay device that applies a current differential method by introducing input quantities from multiple OCTs, such as a busbar protection device, and particularly relates to an input converter and The present invention relates to a current differential protection relay device that can easily perform constant monitoring and automatic inspection to detect defects in current differential relays.
電流差動方式は、複数の入力電流の差を動作量とする方
式で、l)、母線保護、変圧器保護、発電機保護及び送
電線保護等に広く適用されている有用な方式である。本
発明はこれらの電流差動方式のいずれにも適用しうるも
のであるが、以下の説明は母線保護装置を例として行な
う。The current differential method is a method in which the operating amount is the difference between multiple input currents, and is a useful method that is widely applied to bus bar protection, transformer protection, generator protection, power transmission line protection, etc. Although the present invention can be applied to any of these current differential systems, the following description will be made using a bus protection device as an example.
第7図は、母線保護に電流差動リレーを適用した構成を
示すものである。なお、図では簡単のため2つの送電線
Ll、L2と、2重母線BUS −A 。FIG. 7 shows a configuration in which a current differential relay is applied to bus bar protection. In addition, in the figure, for simplicity, two power transmission lines Ll and L2 and a double bus BUS -A are shown.
BUS −Bで構成される系統を示しておυ、送電線L
1は断路器LSIA及びLSIB%送電線L2は断路器
LS2A及びLS2Bによシ、母線BUS −A 、
BUS −Hのいずれにも任意に接続し得る構成となっ
ている。図において、1,2は入力変換器、3,4は電
流差動リレー、5,6,7.8はそれぞれの断路器LS
IA、LSIB、L82A、L82Bに連動し、断路器
「入」の時「閉」する常開接点である。The system consisting of BUS-B is shown as υ, transmission line L.
1 is disconnector LSIA and LSIB% Transmission line L2 is connected to disconnector LS2A and LS2B, bus bar BUS -A,
The configuration is such that it can be arbitrarily connected to any of the BUS-Hs. In the figure, 1 and 2 are input converters, 3 and 4 are current differential relays, and 5, 6, and 7.8 are respective disconnectors LS.
It is a normally open contact that is linked to IA, LSIB, L82A, and L82B and closes when the disconnector is turned on.
第7図において、断路器LSIA及びLS2Aが「入」
即ち送電線Ll、L2がBUS −Aに接続されている
場合、系統電流はそれぞれの変流器CTI。In Figure 7, disconnectors LSIA and LS2A are turned on.
That is, when the power transmission lines Ll and L2 are connected to BUS-A, the grid current is the current of each current transformer CTI.
CT2を介して入力変換器1及び2に導入される。It is introduced into input transducers 1 and 2 via CT2.
更に、入力変換器1及び2で所定の電気量に変換された
のち、断路器LSIA、LS2Aに連動する常開接点5
及び7を介して電流差動リレー3に導入される。一方、
送電線Ll、L2がBUS −Bに接続されている場合
は、入力変換器1,2の出力は断路器LSIB、L82
Bに連動する常開接点6及び8を介して電流差動リレー
4に導入されることになる。即ち、母線BUS −Aに
接続されている送電線の情報は電流差動リレー3に、母
線BUS −Bに接続されている送電線の情報は電流差
動リレー4に導入され、電流差動リレー3は母線BUS
−Aの保護を、又、リレー4は母線BUS −Bの保
護を行なうことになる。Furthermore, after being converted into a predetermined amount of electricity by the input converters 1 and 2, a normally open contact 5 is connected to the disconnectors LSIA and LS2A.
and 7 to the current differential relay 3. on the other hand,
When power transmission lines Ll and L2 are connected to BUS-B, the outputs of input converters 1 and 2 are connected to disconnectors LSIB and L82.
The current will be introduced into the differential relay 4 via normally open contacts 6 and 8 linked to B. That is, information on the power transmission line connected to the bus BUS-A is introduced into the current differential relay 3, and information on the power transmission line connected to the bus BUS-B is introduced into the current differential relay 4. 3 is bus line BUS
-A, and the relay 4 protects the bus BUS -B.
第8図は、上記電流差動リレー3及び4の特性の一例を
示すものでおる。図において、横軸に流入電流、縦軸に
流出電流をとると、常時潮流又は外部事故時の電流軌跡
は+45°の線、つまり図の破線上に存在し、内部事故
時の電流軌跡は横軸上又はその近傍に存在するので、リ
レーは図に示す9及び10の特性を有するように構成す
れば、内、外部事故の判別を行うことができる。実際に
は、9と10をアンドにした図のハツチングで示す比率
差動特性となっている。この特性は、動作式を変えるこ
とによシ、ある程度任意の特性を得られるが、特性自体
は本発明の本章ではないのでその詳細説明は省略する。FIG. 8 shows an example of the characteristics of the current differential relays 3 and 4. In the diagram, if we take the inflow current on the horizontal axis and the outflow current on the vertical axis, the current trajectory during normal power flow or an external fault lies on the +45° line, that is, the broken line in the diagram, and the current trajectory during an internal fault lies horizontally. Since the relay is located on or near the axis, if the relay is configured to have characteristics 9 and 10 shown in the figure, it is possible to distinguish between internal and external accidents. In reality, it has a ratio differential characteristic as shown by the hatching in the figure where 9 and 10 are ANDed. This characteristic can be obtained to some extent by changing the operating formula, but since the characteristic itself is not the main part of the present invention, a detailed explanation thereof will be omitted.
第9図は、入力変換器及び電流差動リレーへの入力回路
の1相分の詳細を示したものである。図において、1は
入力変換器で、!))、1−1.1−2は入力変換器の
1次巻線で、1−1はCT2次電流を導入する巻線、1
−2は点検電流を導入する巻線、1−3.1−4は入力
変換器の2次巻線、1−5.1−6.1−7.1−8は
整流素子である。ここで、巻線の極性側(・印を付しだ
方)を正、他方を負とすると、2次巻線1−3を流れる
電流は正の半波時は整流素子1−7.1−6が導通し、
入力変換器の出力としては■1+が、他方、負の半波時
は整流素子1−8.1−5が導通し、入力変換器の出力
としてはI!−が生じる。一方、巻線1−4に生じる電
流は入力電流に応じた電流工1を生じる(厳密には巻数
比に逆比例の電流)。FIG. 9 shows details of one phase of the input circuit to the input converter and current differential relay. In the figure, 1 is an input converter, ! )), 1-1.1-2 is the primary winding of the input converter, 1-1 is the winding that introduces the CT secondary current, 1
-2 is a winding for introducing a check current, 1-3.1-4 is a secondary winding of the input converter, and 1-5.1-6.1-7.1-8 is a rectifier element. Here, if the polarity side of the winding (the side marked with *) is positive and the other side is negative, the current flowing through the secondary winding 1-3 will flow through the rectifying element 1-7.1 during the positive half wave. -6 is conductive,
The output of the input converter is ■1+; on the other hand, during negative half-waves, the rectifying elements 1-8, 1-5 are conductive, and the output of the input converter is I! − occurs. On the other hand, the current generated in the windings 1-4 generates a current flow 1 according to the input current (strictly speaking, the current is inversely proportional to the turns ratio).
また、入力変換器2についても同様であシ、常開接点5
,7が共に閉ならば、これらは全て電流差動リレー3に
導入される。The same applies to the input converter 2, and the normally open contact 5
, 7 are both closed, they are all introduced into the current differential relay 3.
この電流差動リレー3に導入される電流は、それぞれΣ
1+= 工1++ I 2+、ΣI−=11−+I2−
+(d+= r1+r、となシ、実際の波形を示すと
、I1とI2の大きさ及び位相によシ第10図(a)〜
(C)のように変化する。図において、(a) 、 (
C)は母線の内部事故等、6)は外部事故時の様相と同
様であり、例えば動作式をKIIIdI(IΣI+l
Kg lΣl−1)+K11IdI(IΣl−1−に
21ΣI+1)≧に3(但しに1+に!*に3は任意の
定数)とすることにより、第8図のような特性を有する
電流差動リレーとなる。The current introduced into this current differential relay 3 is Σ
1+= Engineering 1++ I 2+, ΣI-=11-+I2-
+(d+=r1+r, and so on.The actual waveforms are shown in Figure 10(a)-- depending on the magnitude and phase of I1 and I2.
It changes as shown in (C). In the figure, (a), (
C) is the same as the situation in the case of an internal accident on the busbar, etc., and 6) is the same as in the case of an external accident. For example, the operating formula is KIIIdI(IΣI+l
By setting Kg lΣl-1) + K11IdI (IΣl-1- to 21ΣI+1) ≥ 3 (however, to 1+! *3 is an arbitrary constant), a current differential relay with the characteristics as shown in Fig. 8 can be obtained. Become.
一方、常開接点6,8が「閉」の場合、入力変換器の出
力は電流差動リレー4に導入されるが、この場合の応動
はリレー3の場合と同様になる。On the other hand, when the normally open contacts 6, 8 are "closed", the output of the input converter is introduced into the current differential relay 4, but the response in this case is similar to that of the relay 3.
なお、以上は入力変換器が2個の例で説明したが、3個
以上の場合でも同様の作用となる。また、実際の母線保
護装置においては、多数の送電線及び変圧器が接続され
る母線を保護することになるが、この場合でも第7図に
示すL81A、LSIB。Note that although the above description has been made using an example in which there are two input converters, the same effect can be achieved even in the case of three or more input converters. Furthermore, in an actual busbar protection device, a busbar to which a large number of power transmission lines and transformers are connected is protected, and even in this case, L81A and LSIB shown in FIG.
LS2A、LS2Bのような断路器と連動する常開接点
により、当該母線に接続される送電線・変圧器の電流の
みを尚該母線を保護する電流差動リレーに導入すること
が可能であシ、これによシ確実に内外部判定を行うこと
ができる。With normally open contacts that work with disconnectors such as LS2A and LS2B, it is possible to introduce only the current of the power transmission line/transformer connected to the bus into the current differential relay that protects the bus. This makes it possible to reliably determine the inside and outside.
このように、比率差動方式の母線保護装置によれば第1
0図(C)に示すように、内部事故時に流出電流の生じ
る系統でも保護することが可能であるが、当該母線を選
択するために第9図に示すように、断路器と連動する切
替回路を必要とする。第9図の場合は1相分を示してい
るが、実際は3相分の回路が必要なことと、電流差動リ
レーの動作式によっては更に別な電気量を必要とする場
合があり、更にその分の切替回路を必要とすることから
、切替回路、即ち断路器と連動する常開接点を多数必要
とすることになる。In this way, according to the ratio differential type bus bar protection device, the first
As shown in Figure 0 (C), it is possible to protect systems that generate outflow current in the event of an internal fault, but in order to select the relevant bus, a switching circuit that works with a disconnector is required as shown in Figure 9. Requires. In the case of Fig. 9, one phase is shown, but in reality, a three-phase circuit is required, and depending on the operating formula of the current differential relay, another amount of electricity may be required. Since that many switching circuits are required, a large number of normally open contacts are required to operate in conjunction with the switching circuits, that is, the disconnectors.
一般的には、この切替回路には断路器の・ぐレット条件
を増幅した補助リレーあるいはFETや、フォトカプラ
等の半導体を用いた電子スイッチを使用しておシ、多接
点付の補助リレーまだは複数の補助リレーあるいは複数
の電子スイッチを1つの送電線毎に各々BUS −A用
とBUS −B用に必要とする。従って、当該母線の送
電線及び変圧器が多い程この補助リレーや電子スイッチ
の数量も多くなり、装置を構成する上で盤面数の増大、
コスト面で高価となると共に、構成するハードが増大す
る程これらが不良となる度合も増えることになる。Generally, this switching circuit uses an auxiliary relay or FET that amplifies the disconnector's condition, or an electronic switch using a semiconductor such as a photocoupler. requires multiple auxiliary relays or multiple electronic switches for each transmission line, one for BUS-A and one for BUS-B. Therefore, the more power transmission lines and transformers there are on the bus, the more auxiliary relays and electronic switches there will be.
In addition to being expensive in terms of cost, the greater the number of hardware components, the more likely they will be defective.
従って、かかる方式の入力変換器や電流差動リレーの不
良を検出することが必要であシ、この為に従来から自動
点検を行ってこれらの不良を検出している。一般に、第
8図に示す特性の自動点検を行なう場合、図に示すa点
相当の点検電流を印加して小電流域の動作側点検、b点
相当の点検電流を印加して不動作側点検、更に比較的大
電流域ではC点を模擬して動作側点検、d点を模擬して
不動作側点検を夫々行なっている。この場合、自動点検
の対象範囲を極力広くするため、入力変換器を含めて点
検を行なうのが一般的であシ、第9図に示す点検巻線1
−2から点検電流を印加する。Therefore, it is necessary to detect defects in such input converters and current differential relays, and for this purpose automatic inspection has conventionally been performed to detect these defects. Generally, when performing automatic inspection of the characteristics shown in Figure 8, a check current equivalent to point a shown in the figure is applied to check the operating side in the small current range, and a check current equivalent to point b is applied to check the non-operating side. Further, in a relatively large current range, point C is simulated to inspect the operating side, and point d is simulated to inspect the non-operating side. In this case, in order to widen the scope of automatic inspection as much as possible, it is common to inspect the input converter as well, as shown in Figure 9.
Apply the check current from -2.
また、C点又はd点を模擬するためには2つの入力変換
器を必要とするので、当該母線保護装置の中の任意の2
つの入力変換器を選んで行なうか又は、別に点検用の入
力変換器を用いて、これと当該母線保護装置の入力変換
器で行なうことになる。In addition, since two input converters are required to simulate point C or point d, any two input converters in the bus protection device
This can be done by selecting one input converter, or by using a separate input converter for inspection and using this and the input converter of the bus protection device.
ここで、被選択入力変換器の断路器に連動する常開接点
は「閉」シ、他の常開接点は「開」として各々の入力変
換器に印加する点検電流を変えることによシ、第10図
に示す11+I冨の大きさ及び位相を任意に制御できる
。Here, by setting the normally open contact linked to the disconnector of the selected input converter as "closed" and the other normally open contacts as "open", by changing the inspection current applied to each input converter, The magnitude and phase of the 11+I wealth shown in FIG. 10 can be controlled arbitrarily.
以上のことを考慮しながら第9図、第11図によ、)ヶ
来行ヶゎゎ、いえや検カニ□序え7、ゎ )明する
。Taking the above into consideration, Figures 9 and 11 show the following.
第11図は第9図に対して入力変換器の2次側を図の如
く簡略化すると共に、送電線L2と母線BUS −B側
の回路を省略しているが、入力変換器1と電流差動リレ
ー3は第7図、第9図と同等である。11は点検の為に
追加した入力変換器で入力変換器1と同様の構成となっ
ている。In Fig. 11, the secondary side of the input converter is simplified as shown in Fig. 9, and the circuits on the power transmission line L2 and bus line BUS-B side are omitted, but the input converter 1 and the current The differential relay 3 is the same as that shown in FIGS. 7 and 9. Reference numeral 11 denotes an input converter added for inspection, and has the same configuration as input converter 1.
■ 系統構成に無関係に常開接点5.6,7゜8を開と
して電流差動リレー3を無人力とする。■ Irrespective of the system configuration, the normally open contacts 5, 6 and 7° 8 are opened to make the current differential relay 3 unmanned.
■ 点検用入力変換器11に、a点相当の点検電流を流
して電流差動リレー3の動作を確認する。- Check the operation of the current differential relay 3 by passing a check current equivalent to point a through the check input converter 11.
■ 点検用入力変換器11の点検電流の大きさをb点相
当に減少し、電流差動リレー3の復帰を確認する。- Reduce the magnitude of the inspection current of the inspection input converter 11 to the level equivalent to point b, and confirm that the current differential relay 3 has returned.
■ 点検用入力変換器11の点検電流を断ち、電流差動
リレー3を無人力の状態に戻す。■ Cut off the inspection current of the inspection input converter 11 and return the current differential relay 3 to the unmanned state.
■ 系統条件とは無関係に常開接点5を閉路させると共
に、入力変換器1と点検用入力変換器11に逆極性の点
検電流を夫々流す。ここで入力変換器1に流す点検電流
を点検用入力変換器11に流す点検電流よシ十分大きく
することにより0点相当を模擬し電流差動リレー3の動
作を確認する。(2) The normally open contact 5 is closed regardless of the system conditions, and inspection currents of opposite polarity are passed through the input converter 1 and the inspection input converter 11, respectively. Here, the operation of the current differential relay 3 is confirmed by making the inspection current flowing through the input converter 1 sufficiently larger than the inspection current flowing through the inspection input converter 11 to simulate the 0 point.
■ 点検用入力変換器11に流す点検電流を上記0項記
載のものよυ大きくすることによりd点相当を模擬し、
電流差動リレー3の復帰を確認する。■ Simulate the equivalent of point d by increasing the inspection current flowing through the inspection input converter 11 compared to the one described in item 0 above,
Check that the current differential relay 3 has returned.
■ 入力変換器1及び点検用入力変換器11の各点検電
流を断つと共に、常開接点5を開路させ、電流差動リレ
ー3を無人力の状態に戻す。(2) Cut off each inspection current of the input converter 1 and inspection input converter 11, open the normally open contact 5, and return the current differential relay 3 to the unmanned state.
■ 次に常開接点7を閉路させると共に、入力変換器2
と点検用入力変換器11との組合せにより上記0〜0項
と同様な操作を行なう。■ Next, the normally open contact 7 is closed, and the input converter 2
The same operation as in the above items 0 to 0 is performed by combining the input converter 11 for inspection.
以下順次図示していない他の送電線、変圧器について同
様な操作を繰返す。Similar operations are repeated for other power transmission lines and transformers (not shown).
■ 母線BUS −A側、即ち電流差動リレー3の点検
が終了したら、母線BUS −B側、即ち電流差動リレ
ー4と各入力変換器についても同様な操作を繰返す。(2) After completing the inspection of the bus BUS-A side, that is, the current differential relay 3, repeat the same operation for the bus BUS-B side, that is, the current differential relay 4 and each input converter.
■ 最後の入力変換器まで終了したら点検終了となるの
で、常開接点5,6,7.8を系統状態に合せて開路又
は閉路させ系統条件に対応させる。- When the inspection is completed up to the last input converter, the normally open contacts 5, 6, 7.8 are opened or closed according to the system condition to correspond to the system condition.
ここで点検電流の印加方法について第11図によシ説明
する。Here, the method of applying the inspection current will be explained with reference to FIG.
図は入力変換器1及び点検用入力変換器11について示
すが、1−1.11−1は実巻線と称するものでCT2
次電流電流入される。但しこの場合11−1は使用しな
い。1−2.11−2は点検巻線、”−C111−0は
夫々入力変換器及び点検用入力変換器の2次側巻線であ
り、実際には、リレーの動作式によシ第9図のような構
成となる。The figure shows the input converter 1 and the input converter 11 for inspection, but 1-1.11-1 is called the actual winding, and CT2
The next current is applied. However, in this case, 11-1 is not used. 1-2.11-2 is the inspection winding, and ``-C111-0 is the secondary winding of the input converter and input converter for inspection, respectively. The configuration is as shown in the figure.
この回路において上記■のステップにおける点検電流エ
アが印加されると2次電流iTはそのまま電流差動リレ
ー3に印加される。即ち、2次電流iTと電流差動リレ
ー3の入力電流’RYとは等しい。In this circuit, when the inspection current air in step (2) above is applied, the secondary current iT is directly applied to the current differential relay 3. That is, the secondary current iT and the input current 'RY of the current differential relay 3 are equal.
ここで前記iTの大きさをa点相当の電流となるよう調
整することによりミ流差動リレー3が動作する。同様に
ステップ■では点検電流iTの大きさをb点相当の大き
さに減少すればよい。Here, by adjusting the magnitude of the iT so that the current corresponds to point a, the differential relay 3 operates. Similarly, in step (2), the magnitude of the inspection current iT may be reduced to a magnitude corresponding to point b.
次にステップ■では常開接点5を閉路させると共に、各
点検巻線1−2及び11−2に点検電流Il及び■7を
印加する。従って電流差動リレー3の入力電流’RYは
それぞれの2次電流i1とiTの和電流となる。なおi
lとiTの位相を全く逆にすることにより一方は流入電
流、他方は流出電流を模擬することが可能である。ここ
で11を流入側、i、を流出側とし、かつI ’ lI
> 21 s T Iとなるようにそれぞれの電流の
大きさを調整することにより第8図図示C点相当を模擬
することができ、更にステップ■では2+”rDl<1
1となるようにそれぞれの電流の大きさを調整すること
により第8図図示d点相当を模擬することが可能である
。Next, in step (2), the normally open contact 5 is closed, and the inspection currents Il and (7) are applied to each inspection winding 1-2 and 11-2. Therefore, the input current 'RY of the current differential relay 3 becomes the sum of the respective secondary currents i1 and iT. Furthermore, i
By completely reversing the phases of l and iT, one can simulate an inflow current and the other can simulate an outflow current. Here, 11 is the inflow side, i is the outflow side, and I' lI
By adjusting the magnitude of each current so that
By adjusting the magnitude of each current so that the current is 1, it is possible to simulate the point corresponding to point d shown in FIG.
以下ステップ■以降も同様である。The same applies to steps after step ①.
上記構成を有する従来装置ではa点、b点の模擬は点検
専用の入力変換器11によって行なうために前記潮流に
よる影響はない。しかし0点、d点については各回線に
よる入力変換器1,2等を介して潮流が入力され、点検
電流に重畳することになるが、リレー特性を飛び出さな
いように点検電流を定格潮流に比して十分大きくしてお
けば、たとえ点検ポイントC及び点検ポイントdがリレ
ー特性に近づいたとしても問題はないが不良の発見精度
は低下する。また、このような模擬が困難な場合や、点
検での検出精度を高めるためには、入力変換器1,2の
それぞれに潮流キャン、セル回路を設けることが必要で
ある。In the conventional device having the above configuration, since the simulation of points a and b is performed by the input converter 11 exclusively for inspection, there is no influence from the power flow. However, for points 0 and d, the power flow is input via input converters 1 and 2 for each line, and is superimposed on the inspection current, but in order to avoid changing the relay characteristics, the inspection current is adjusted to the rated power flow. If it is made sufficiently larger than that, there will be no problem even if the inspection point C and the inspection point d approach the relay characteristics, but the accuracy of detecting defects will decrease. Furthermore, in cases where such simulation is difficult or in order to improve detection accuracy during inspection, it is necessary to provide a power flow canceling and celling circuit in each of the input converters 1 and 2.
上記、従来方式によれば入力変換部及び動作判定部の点
検を全て洩れなく行なうことが可能であるが、これらの
方法は各入力変換器毎に1個ずつシリーズに点検を行な
うようにしているため、当該母線に接続される送電線が
多くなれば、それだけ回路構成が複雑になって1回に要
する所要時間が増加する欠点を有している。更に点検回
路の増加分だけ盤面が増加することと、1回の点検時間
が長くなることによって点検中の系統事故に遭遇する確
率が増加すること、従って点検中の事故の場合は事故除
去が遅れるという保護機能上の問題点が発生する。According to the above-mentioned conventional method, it is possible to inspect all input converters and operation determination sections without omission, but in these methods, each input converter is inspected one by one in series. Therefore, as the number of power transmission lines connected to the bus increases, the circuit configuration becomes more complicated and the time required for one operation increases. Furthermore, the panel surface increases due to the increase in the number of inspection circuits, and the time required for one inspection increases, so the probability of encountering a system fault during inspection increases, and therefore, in the case of an accident during inspection, the removal of the fault will be delayed. This causes a problem regarding the protection function.
前述のような従来の点検方法による効果を要約すると、
電流差動リレーの単なる動作、不動作の確認の他に、
(、) 電流差動リレーの特性変化を検出できる。To summarize the effects of conventional inspection methods as mentioned above,
In addition to simply confirming whether a current differential relay is operating or not, it is also possible to detect changes in the characteristics of a current differential relay.
(b) 入力変換器と電流差動リレー間の導通がある
ことを確認できる。(b) It can be confirmed that there is continuity between the input converter and the current differential relay.
ということであるが、これらを同一の方法で点検してい
る為、(a)については潮流の影響を避ける必要がある
ことから点検精度の低下をきたし、(b)については各
回線毎に行なう為、回路が複雑になると共に点検時間が
長くなるという欠点を生じている。However, since these are inspected using the same method, the accuracy of inspection will decrease due to the need to avoid the influence of tidal currents for (a), and the inspection accuracy will be reduced for (b) for each line. Therefore, the disadvantage is that the circuit becomes complicated and the inspection time becomes longer.
〔発明の目的〕
本発明は上記問題点を解決するためになされたものであ
シ、従来の不良の検出機能を低下させることなく、回路
構成が簡単でかつ点検時間の短縮をはかるようにした電
流差動リレーの不良検出を常時監視及び自動点検で実現
し得る電流差動保護継電装置を提供することを目的とし
ている。[Object of the Invention] The present invention has been made to solve the above problems, and it is possible to simplify the circuit configuration and shorten the inspection time without degrading the conventional defect detection function. The object of the present invention is to provide a current differential protective relay device that can detect defects in current differential relays through constant monitoring and automatic inspection.
本発明の狙いを第12図により、整理して説明する。第
8図と同一部分には同一符号を付してあシ、リレー特性
(ハツチング下側が動作域)をはさんでC点で動作域、
d点で不動作側の点検を行なっても、従来の方法では潮
流の影響でC点、d点が各々、破線で囲んだ範囲に移る
ことを示している。つまシ、リレー特性の近傍で検出精
度の高い点検を行なうには潮流をキャンセルして行なう
必要があることを意味する。これは前述(a)に関係す
る内容である。The aim of the present invention will be summarized and explained with reference to FIG. The same parts as in Fig. 8 are given the same symbols, and the operating range is at point C across the relay characteristics (the operating range is below the hatching).
Even if the non-operating side is inspected at point d, in the conventional method, points C and d each move to the range surrounded by the broken line due to the influence of the current. This means that in order to perform inspections with high detection accuracy in the vicinity of the pick and relay characteristics, it is necessary to cancel the current flow. This is related to the above (a).
第12図のe点の模擬をした場合、潮流の影響は受ける
ものの、それは07点又はe”点に移るのみであシ、常
に+45°即ち図で原点を通る破線上を外れることはな
い。これは前述(b)に関係するもので本発明の着目し
た点である。When point e in Fig. 12 is simulated, although it is affected by the current, it only moves to point 07 or point e'', and it never deviates from +45°, that is, on the broken line passing through the origin in the figure. This is related to the above-mentioned (b) and is the focus of the present invention.
前述した(、)に対しては第9図において入力変換器2
次側の常開接点を全て「開」にすることにより潮流分の
入力が阻止され、上記C点、d点の模擬は第11図に示
した点検用の入力変換器を2個用いて行なうか、図示し
ていないが電流差動リレーの入力部に直流レベルで直接
点検入力を印加することでリレー特性の近傍を高精度に
模擬することが可能である。For the above-mentioned (,), input converter 2 is shown in FIG.
By opening all the normally open contacts on the next side, the input of the power flow is blocked, and the above points C and d are simulated using two input converters for inspection as shown in Figure 11. Alternatively, although not shown, it is possible to simulate the vicinity of the relay characteristics with high precision by directly applying a direct current level inspection input to the input section of the current differential relay.
一方前記した(b)に対してはその目的からして潮流を
キャンセルすることができないので、逆にこれを積極的
に活用する方法を考案した。っ′1.シ、第12図の+
45°線上は、流入−流出の点であり、潮流の場合でも
、点検電流印加の場合でも、流入=流出の関係が成立す
るならばこの線上を外れることはない。従ってこの線上
から外れた場合を検出することにより、入力変換器から
電流差動リレーの入力部を含めた不良を発見できること
になる。On the other hand, regarding (b) mentioned above, since it is not possible to cancel the current due to its purpose, we devised a method to actively utilize this. t'1. + in Figure 12
The point on the 45° line is the inflow-outflow point, and whether in the case of a tidal current or in the case of applying a check current, if the relationship of inflow=outflow is established, the point will not deviate from this line. Therefore, by detecting a deviation from this line, it is possible to discover defects in the input converter, including the input section of the current differential relay.
以下、図面を参照して本発明にょる一実施例について説
明する。第1図は本発明による電流差動リレー装置の一
実施例構成図を示すもので、第9図と同一部分には同一
符号を付している。Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration diagram of an embodiment of a current differential relay device according to the present invention, and the same parts as in FIG. 9 are given the same reference numerals.
図において12.13は加算回路であシ、夫々、電流差
動リレー3,4に入力するΣI+とΣI−を424,1
ヵ1x、、!。、□ヵ、t−1ttヮ□あ (るとき
夫々の出力12A、13Aを生じる構成となっている。In the figure, 12.13 is an adder circuit, and 424 and 1
Ka1x,,! . , □ka, t-1ttヮ□a (The configuration is such that outputs of 12A and 13A are produced, respectively.
ここで設定するレベルは常時の誤差分で動作しないレベ
ルとする。図では、説明を容易にするため、電流差動リ
レー3,4とは別の構成として表現したが、これは電流
差動リレー3の中に加算回路12を、同じく4の中に1
3を夫々状 ′納し、極力電流差動リレーと加算回路の
同一の回路は共用するように構成した方が望ましい。The level set here is a level that does not operate due to the constant error. In the figure, for ease of explanation, the current differential relays 3 and 4 are shown as having a separate configuration.
It is preferable that the circuits 3 are housed in separate configurations, and that the same circuits of the current differential relay and the adder circuit are shared as much as possible.
かかる構成において、断路器と連動する常開接点5,7
が「閉」の場合、即ち送電線が全てBUS−人に接続さ
れている場合、入力変換器の出力は全て電流差動リレー
3に導入される。ここで、入力変換器1に潮流■L1、
入力変換器2にIL2が流れている場合、母線全体では
流入=流出の関係が成立するので、潮流IL1と工り、
は大きさが等しく向きが逆の関係になる。従って、入力
変換器が正常であれば電流差動リレー3及び加算回路1
2に導入される電気量Σ1+、ΣI−、I、は第10図
6)に示す状態と同様であシ、加算回路12の出力12
Aは出力されない。In such a configuration, the normally open contacts 5, 7 that operate in conjunction with the disconnector
When is "closed", that is, when all transmission lines are connected to BUS-P, the outputs of the input converters are all introduced into the current differential relay 3. Here, the input converter 1 has a current ■L1,
When IL2 is flowing to the input converter 2, the relationship of inflow = outflow is established for the entire bus bar, so the current is
are equal in magnitude and opposite in direction. Therefore, if the input converter is normal, the current differential relay 3 and the adder circuit 1
The electrical quantities Σ1+, ΣI−, I introduced into the circuit 2 are similar to the state shown in FIG.
A is not output.
ここで、何らかの原因によシ入力変換器又は入力変換器
と電流差動リレー間の回路が不良となり、電気量Σ■−
の全部又は一部が電流差動リレー3及び加算回路12に
導入されなかった場合、Σ■+とΣI−に差が生じるの
で、加算回路12の出力12Aが出力され、これを常時
監視することによりネ良を検出できる。Here, due to some reason, the input converter or the circuit between the input converter and the current differential relay becomes defective, and the electrical quantity Σ■-
If all or part of the current is not introduced into the current differential relay 3 and the adder circuit 12, a difference will occur between Σ■+ and ΣI−, so an output of 12A from the adder circuit 12 is output, and this must be constantly monitored. It is possible to detect sluggishness.
潮流がない場合、不良があっても検出しえないが、この
場合は点検を行なうことによυ改善される。即ち第1図
に示すように入力変換器の点検巻線に入力変換器1と2
に点検電流Itを逆極性で印加することにより潮流の場
合と同等の効果を得ることができる。If there is no current, it will not be possible to detect any defects, but in this case it can be improved by inspection. That is, as shown in FIG.
By applying the inspection current It with opposite polarity to the current, it is possible to obtain the same effect as in the case of tidal current.
なお、点検時に潮流があった場合の影響を第12図を用
いて説明する。この場合、点検電流、潮流の夫々に流入
=流出の関係が成立するので、これらの電流軌跡は図で
原点を通る+45° 線上から外れることはない。従っ
て点検電流によシ模擬した点をe点とするならば、点検
電流と潮流の合成値が小さくなる場合(例えば両者が逆
位相)・は07点に、合成値が大きくなる場合(両者が
同位相)はe“点に移るのみであシ、第1図に示す本発
明の構成によれば、潮流の影響を受けない点検方式を供
給できる。The influence of tidal currents during inspection will be explained using FIG. 12. In this case, since an inflow=outflow relationship is established for each of the inspection current and the tidal current, these current trajectories do not deviate from the +45° line passing through the origin in the figure. Therefore, if the point simulated by the inspection current is point e, when the composite value of the inspection current and power flow becomes small (for example, they are in opposite phase), it is at point 07, and when the composite value becomes large (for example, when both are in opposite phase), it is at point 07. (the same phase) only moves to point e'', and according to the configuration of the present invention shown in FIG. 1, it is possible to provide an inspection method that is not affected by the power flow.
これらの関係を正常の場合と不良の場合に分けて整理し
た図を第2図に示す。不良の場合の波形は不良内容によ
シ種々変ってくるが図はその1例を示す。なお本発明で
付加した加算回路]、 2 、13自体の機能は点検時
に流入のケースを模擬(これは第2図の不良の場合を模
擬することに相当する)することにより確認できるので
、本発明の効果を懸念することはない。FIG. 2 shows a diagram in which these relationships are classified into normal cases and defective cases. The waveform in the case of a defect varies depending on the content of the defect, and the figure shows one example. Note that the function of the adder circuit added in the present invention], 2, and 13 itself can be confirmed by simulating the case of inflow (this corresponds to simulating the case of failure shown in Fig. 2) during inspection. There is no need to worry about the effectiveness of the invention.
以上の説明は送電線が2つで母線BUS −A側に接続
されている場合であるが、母線BUS −Hに接続され
ている場合、更に送電線が3つ以上の場合でも夫々のケ
ースでは流入−流出の関係が成立しておシ、本発明の構
成をそのまま適用しうるのは明らかである。The above explanation is for the case where two power transmission lines are connected to the bus BUS-A side, but even if there are three or more power transmission lines connected to the bus BUS-H, each case will be different. It is obvious that the structure of the present invention can be applied as is if the inflow-outflow relationship is established.
特に送電線が多回線の場合で自動点検を行なう場合に、
本発明の効果が顕著になる。即ち送電線の数が偶数の場
合、入力変換器を2つのグループに分は第3図のように
夫々のグループの入力変換器の点検巻線を直列に接続し
、夫々のグループの点検巻線に逆極性の点検電流を印加
することにより流入−流出の関係のまま点検電流を与え
ることになる。これは第12図の特性図で0点が+45
゜の線上をe“よシ遠方つまシ原点から更に遠ざかる方
向に移るのみであシ、正常であればこの線上から外れる
ことはない。仮にいずれかの入力変換器が不良の場合は
第2図に示した不良の場合の様相を呈するのでその差を
判別するのは容易である。Especially when performing automatic inspections when the power transmission line has multiple circuits,
The effect of the present invention becomes remarkable. In other words, when the number of transmission lines is even, the input converters can be divided into two groups by connecting the check windings of the input converters of each group in series as shown in Figure 3, and connecting the check windings of the input converters of each group in series. By applying a check current of opposite polarity to the inflow-outflow relationship, the check current is applied to the inflow-outflow relationship. This is the characteristic diagram in Figure 12 where the 0 point is +45
The far end only moves further away from the origin on the line ``e'', and if it is normal, it will not deviate from this line.If any of the input converters is defective, as shown in Figure 2. It is easy to tell the difference because it exhibits the appearance of the defect shown in the figure below.
一方回線数が奇数の場合でも、端数分を第4図に示すよ
うにいずれかのグループの入力変換器の1個と並列に接
続することにより、流入−流出の関係を成立できるので
偶数の場合と同等に扱える。On the other hand, even if the number of lines is odd, an inflow-outflow relationship can be established by connecting the fractional number in parallel with one of the input converters of either group, as shown in Figure 4. can be treated equally as
このように多回線の場合、本発明の方法によれば従来容
入力変換器ごとに点検を行なっていたのが1回の点検で
済むので回路構成の簡略化と点検時間の大幅な短縮が実
現できるのでその効果は非常に犬である。In the case of multiple circuits, the method of the present invention allows only one inspection instead of the conventional inspection for each input converter, which simplifies the circuit configuration and significantly shortens inspection time. Its effects are very canine.
次に本発明の他の実施例について説明する。前述の構成
例は1相分の回路について説明したが第1図の加算回路
の導入量を第5図に示すように3相分の全ての電気量Σ
工+、Σニーを導入し、これを一括して加算しても本発
明の目的を達成することができる。Next, other embodiments of the present invention will be described. Although the above configuration example was explained for a circuit for one phase, the amount of electricity introduced in the adder circuit in FIG.
The object of the present invention can also be achieved by introducing the + and Σ knees and adding them all at once.
第5図において、14−1.14−2.14−3は電流
差動リレーであり、本図では各相ごとに分けて表現した
がこれは一括構成でも良い。15は本実施例を構成する
加算回路で各相似の電気量Σ1+、ΣI−1つまシロつ
の電気量をベクトル的に合成する加算回路で合成値が一
定値以上あった時に出力15Aが生じる構成になってい
る。In FIG. 5, reference numerals 14-1, 14-2, and 14-3 are current differential relays, and although they are shown separately for each phase in this diagram, they may be configured as one unit. Reference numeral 15 denotes an adder circuit constituting this embodiment, which vectorially combines two similar electric quantities Σ1+ and ΣI−1, and is configured to generate an output of 15 A when the combined value is above a certain value. It has become.
この回路の作用は入力量が2つから6つに増えたことを
除けば第1図の場合と全く同様であるが代表例を第6図
に示す。第2図に比し、3相の合成のため、波形は複雑
であるが結果的には全体が正常ならばトータルの加算値
が一定レベル以下であり、不良が′あると正の半波と負
の半波がアンバランスとなることによシ図のように加算
値Ikが生じる。The operation of this circuit is exactly the same as that shown in FIG. 1 except that the number of inputs is increased from two to six, but a typical example is shown in FIG. Compared to Figure 2, the waveform is complicated because it is a combination of three phases, but if the whole is normal, the total added value will be below a certain level, and if there is a defect, it will be a positive half wave. When the negative half-wave becomes unbalanced, an additional value Ik is generated as shown in the figure.
このように3相の波形を加算する場合でも1相の場合と
同様の効果を得ることができる。また点検を行なう場合
でも3相一括でかつ流入−流出の関係を保ちながら点検
電流を印加することで同様の効果が得られる。Even when three-phase waveforms are added in this way, the same effect as in the one-phase case can be obtained. Also, when performing inspection, the same effect can be obtained by applying inspection current to all three phases at once while maintaining the inflow-outflow relationship.
以上説明したように本発明の電流差動リレー装置によれ
ば、電流差動リレーの入力部に正の半波の合成量Σ工+
と負の半波の合成量Σニーを加算する回路を設け、この
回路を監視することにより、潮流をキャンセルすること
なく、入力変換器及びその出力から電流差動リレーの入
力部に至る回路の不良を常時監視又は自動点検で検出す
ることが可能である。As explained above, according to the current differential relay device of the present invention, the positive half-wave composite amount Σ +
By providing a circuit that adds the negative half-wave composite amount Σ knee, and monitoring this circuit, the circuit from the input converter and its output to the input section of the current differential relay can be adjusted without canceling the power flow. It is possible to detect defects through constant monitoring or automatic inspection.
特に自動点検の場合、従来の方法によれば入力変換器に
1個ずつ点検入力を印加し、全部の入力変換器をシリー
ズに点検していたのに対し、本発明の場合1回の点検で
全ての入力変換器をチェックできるので、回路構成を簡
略化できると共に点検時間の大幅な短縮が可能でアシ、
従来よ多機能的に向上し、縮小化された装置を低コスト
で実現できるものである。In particular, in the case of automatic inspection, the conventional method applies inspection input to input converters one by one and inspects all input converters in series, whereas with the present invention, inspection is performed only once. Since all input converters can be checked, the circuit configuration can be simplified and inspection time can be significantly shortened.
It is possible to realize a miniaturized device with improved multi-functionality compared to the conventional device at a low cost.
第1図は本発明による電流差動保護継電装置の一実施例
を示す構成図、第2図は本発明の詳細な説明するだめの
相関図、第3図は入力変換器が偶数の場合の点検電流の
印加方法、第4図は入力変換器が奇数の場合の点検電流
の印加方法、第5図は本発明の他の実施例を示す構成図
、第6図は本発明の他の実施例の効果を説明するだめの
相関図、第7図は従来の電流差動リレーを適用した場合
の構成図、第8図は電流差動リレーの特性図、第9図は
入力変換回路の具体例を示す詳細図、第10図(、)〜
(C)は電動差動リレーに導入する電流を示す波形図、
第11図は点検電流の印加方法を示す回路図、第12図
は点検ポイントを示す特性図である。
11・・・点検入力変換器 12,13.15・・・加
算回路ビの卜
第10
T21)
<C)
(lI+l>lhl)Fig. 1 is a configuration diagram showing an embodiment of the current differential protection relay device according to the present invention, Fig. 2 is a correlation diagram for explaining the present invention in detail, and Fig. 3 is a case where the number of input converters is even. Fig. 4 shows a method of applying a test current when the number of input converters is an odd number, Fig. 5 is a block diagram showing another embodiment of the present invention, and Fig. 6 shows another example of the present invention. A correlation diagram to explain the effects of the embodiment, Fig. 7 is a configuration diagram when a conventional current differential relay is applied, Fig. 8 is a characteristic diagram of the current differential relay, and Fig. 9 is a diagram of the input conversion circuit. Detailed drawing showing a specific example, Fig. 10(,)~
(C) is a waveform diagram showing the current introduced into the electric differential relay,
FIG. 11 is a circuit diagram showing a method of applying a check current, and FIG. 12 is a characteristic diagram showing check points. 11...Inspection input converter 12,13.15...Addition circuit Bi No. 10 T21) <C) (lI+l>lhl)
Claims (1)
象からの入力電流量を正の半波と負の半波に変換するこ
とにより対応する電流差動リレーに導入し、前記電流差
動リレー出力が所定値以上であるとき動作出力を導出す
る電流差動保護継電装置において、各電流差動リレーに
は入力電流量の正の半波の総和と負の半波の総和を加算
する回路を夫々もうけ、前記加算回路の出力が一定レベ
ル以下であるとき、正常と判定する回路をもうけて、入
力変換器及び電流差動リレーの不良を検出することを特
徴とする電流差動保護継電装置。The amount of input current from each protected object is converted into a positive half-wave and a negative half-wave through an input converter provided for each protected object, and introduced into the corresponding current differential relay. In a current differential protection relay device that derives an operating output when the differential relay output is equal to or higher than a predetermined value, each current differential relay has a sum of the positive half-wave and a sum of the negative half-wave of the input current. A current differential system characterized in that a circuit for adding is provided, and a circuit for determining normality when the output of the adding circuit is below a certain level is provided to detect a defect in the input converter and the current differential relay. Protective relay device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27471084A JPS61157222A (en) | 1984-12-28 | 1984-12-28 | Current differential protective relay device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27471084A JPS61157222A (en) | 1984-12-28 | 1984-12-28 | Current differential protective relay device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61157222A true JPS61157222A (en) | 1986-07-16 |
Family
ID=17545484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27471084A Pending JPS61157222A (en) | 1984-12-28 | 1984-12-28 | Current differential protective relay device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61157222A (en) |
-
1984
- 1984-12-28 JP JP27471084A patent/JPS61157222A/en active Pending
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