JPH0522839A - Ratio differential relay system - Google Patents
Ratio differential relay systemInfo
- Publication number
- JPH0522839A JPH0522839A JP3194832A JP19483291A JPH0522839A JP H0522839 A JPH0522839 A JP H0522839A JP 3194832 A JP3194832 A JP 3194832A JP 19483291 A JP19483291 A JP 19483291A JP H0522839 A JPH0522839 A JP H0522839A
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- Prior art keywords
- current
- output
- transformer
- relay device
- ratio
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電力系統における発電
機、変圧器、母線、送配電線の保護に用いられる比率差
動継電システムに関し、特に変流器が飽和した時の不要
動作防止対策に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ratio differential relay system used to protect generators, transformers, buses and distribution lines in a power system, and particularly to prevent unnecessary operation when a current transformer is saturated. Regarding measures.
【０００２】[0002]
【従来の技術】従来、この種の装置として図５ないし図
７に示すものがある。図５は発電機保護継電装置ＧＰの
外部継続図、図６は発電保護継電装置ＧＰに使用される
比率差動手段８７Ｇの内部ブロック図、図７は比率差動
手段８７Ｇの比率差動特性図を示し、図５において、Ｂ
ＵＳは電力系統の母線、Ｇは被保護発電機、ＴＲは被保
護発電機Ｇと同一の母線に接続された変圧器、Ｌは変圧
器ＴＲの負荷、ＣＢ１、ＣＢ２、ＣＢ３は遮断器、ＣＴ
１、ＣＴ２は変流器、ＧＰは発電機保護継電装置、ＩE
は変圧器ＴＲを遮断器ＣＢ２により無負荷投入した時の
インラッシュ電流、Ｉ1 、Ｉ2 は変流器ＣＴ１、ＣＴ２
の２次側電流である。また、図６において、Ｉd は差動
電流、Ｃ１、Ｃ２、Ｃ３は比率差動手段８７Ｇの入力端
子、ＴRCは抑制電流（Ｉ1 ＋Ｉ2 ）を導入する抑制入力
トランス、ＴOCは差動電流を導入する差動入力トラン
ス、ＣＭは比率差動特性を得るための比較手段で、抑制
電流に対する差動電流の比率が一定値以上の時、すなわ
ち Ｋ＝差動電流／抑制電流＝Ｉd ／（Ｉ1 ＋Ｉ2 ）＝（Ｉ1 −Ｉ2 ）／（Ｉ1 ＋ Ｉ2 ）＞ＫS （例えばＫS ＝０．１） で動作する。2. Description of the Related Art Conventionally, an apparatus of this type is shown in FIGS. 5 is an external continuation diagram of the generator protection relay device GP, FIG. 6 is an internal block diagram of the ratio differential means 87G used in the power generation protection relay device GP, and FIG. 7 is a ratio differential device of the ratio differential means 87G. A characteristic diagram is shown in FIG.
US is the bus of the power system, G is the protected generator, TR is the transformer connected to the same bus as the protected generator G, L is the load of the transformer TR, CB1, CB2 and CB3 are circuit breakers, CT
1, CT2 is a current transformer, GP is a generator protection relay device, IE
Is the inrush current when the transformer TR is turned on without load by the circuit breaker CB2, and I 1 and I 2 are the current transformers CT1 and CT2.
Is the secondary side current. In FIG. 6, I d is a differential current, C1, C2 and C3 are input terminals of the ratio differential means 87G, T RC is a suppression input transformer for introducing a suppression current (I 1 + I 2 ), and T OC is a difference. A differential input transformer for introducing a dynamic current, CM is a comparison means for obtaining a ratio differential characteristic, and when the ratio of the differential current to the suppression current is a certain value or more, that is, K = differential current / suppression current = I operating at d / (I 1 + I 2 ) = (I 1 -I 2) / (I 1 + I 2)> K S ( e.g. K S = 0.1).
【０００３】このように構成された従来の発電機保護継
電装置ＧＰの動作を説明する。 １）外部故障Ｆ２発生時（図７（ａ）、（ｂ）参照） 変流器ＣＴ１、変流器ＣＴ２の２次側電流において、流
入電流Ｉ1F2 ＝流出電流Ｉ2F2 とすると、抑制トランス
ＴRCの出力である抑制電流＝Ｉ1F2 ＋Ｉ2F2 と、差動ト
ランスＴOCの出力である差動電流Ｉd ＝Ｉ1F2 −Ｉ2F2
を比較手段ＣＭで比較し、 Ｋ2F＝差動電流／抑制電流＝（Ｉ1F2 −Ｉ2F2 ）／（Ｉ1F2 ＋Ｉ2F2 ） ＝０／Ｉ1F2 ＝０＜ＫS ＝０．１ で、比率差動手段８７Ｇは不動作となる。The operation of the conventional generator protection relay device GP thus configured will be described. 1) When an external failure F2 occurs (see FIGS. 7A and 7B) When the inflow current I 1F2 = outflow current I 2F2 in the secondary current of the current transformer CT1 and the current transformer CT2, the suppression transformer T and RC of which is the output suppressing current = I 1F2 + I 2F2, differential current I d = I 1F2 -I is the output of the differential transformer T OC 2F2
Are compared by the comparison means CM, and K 2F = differential current / suppression current = (I 1F2 −I 2F2 ) / (I 1F2 + I 2F2 ) = 0 / I 1F2 = 0 <K S = 0.1, and the ratio difference The moving means 87G becomes inoperative.
【０００４】 ２）内部故障Ｆ１発生時（図７（ｂ）、（ｃ）参照） 流入電流Ｉ1 ＝Ｉ1F1 、流出電流Ｉ2 ＝０とすると、抑
制電流＝差動電流Ｉd ＝Ｉ1F1 、 Ｋ1F＝差動電流／抑制電流＝（Ｉ1F1 −Ｉ2F1 ）／（Ｉ1F1 ＋Ｉ2F1 ） ＝Ｉ1F1 ／Ｉ1F1 ＝１＞ＫS ＝０．１ で、比率差動手段８７Ｇは動作する。2) When an internal failure F1 occurs (see FIGS. 7B and 7C) If inflow current I 1 = I 1F1 and outflow current I 2 = 0, suppression current = differential current I d = I 1F1 , K 1F = differential current / suppression current = (I 1F1 −I 2F1 ) / (I 1F1 + I 2F1 ) = I 1F1 / I 1F1 = 1> K S = 0.1, and the ratio differential means 87G operates. ..
【０００５】[0005]
【発明が解決しようとする課題】上記の如く構成におい
ては、図５に示す変圧器ＴＲを無負荷（遮断器ＣＢ３を
開放）でＣＢ２で投入すると、図８に図示の様な直流分
ＩDCを含む大きなインラッシュ電流ＩE が変流器ＣＴ
１、ＣＴ２、を貫通して流れるが、このとき、本来は変
流器ＣＴ１、ＣＴ２の２次側電流Ｉ1 ＝Ｉ2 で差動電流
Ｉd ＝０となるべきであるが、直流分による磁束が逐次
積分されて変流器ＣＴ１またはＣＴ２の少なくとも一
方、例えばＣＴ２が飽和して出力が低下し誤差電流が差
動電流Ｉd として流れた場合、即ち、図７（Ｃ）に変流
器ＣＴ２飽和時のインラッシュとして図示の様な領域の
電流が入力されると、比率差動手段８７Ｇが不要に動作
してＣＢ１トリップ出力が出力されると言う重大な不具
合があった。In the configuration described above, when the transformer TR shown in FIG. 5 is turned on with no load (the circuit breaker CB3 is opened) at CB2, the DC component I DC as shown in FIG. 8 is obtained. A large inrush current I E including the current transformer CT
1 and CT2, but at this time, originally, the secondary current I 1 = I 2 of the current transformers CT1 and CT2 should be the differential current I d = 0, but it depends on the DC component. When the magnetic flux is sequentially integrated and at least one of the current transformers CT1 and CT2, for example, CT2 is saturated and the output decreases and an error current flows as a differential current I d , that is, the current transformer in FIG. 7C. When a current in the area shown in the figure is input as an inrush when CT2 is saturated, there is a serious problem that the ratio differential means 87G operates unnecessarily and the CB1 trip output is output.
【０００６】この不具合を解決するためには、変流器を
大容量のものを使用することが望ましいが、大型化、高
コスト化で限界があり、現実的には直流分を含んだイン
ラッシュ電流の貫通時に完全に飽和しない充分な容量の
変流器を用意することは極めて困難である。In order to solve this inconvenience, it is desirable to use a current transformer having a large capacity, but there is a limit in increasing the size and cost, and in reality, the inrush including the DC component is limited. It is extremely difficult to prepare a current transformer with a sufficient capacity that does not completely saturate when a current passes through.
【０００７】本発明は、上記のような不具合を解決する
ためになされたもので、直流分を含んだ変圧器のインラ
ッシュ電流が変流器ＣＴ１、ＣＴ２を貫通し少なくとも
一方の変流器が飽和する場合でも不要動作のない信頼度
の高い比率差動継電システムを提供することを目的とす
る。The present invention has been made to solve the above-mentioned problems, and the inrush current of the transformer containing the direct current component penetrates the current transformers CT1 and CT2 and at least one of the current transformers is It is an object of the present invention to provide a highly reliable ratio differential relay system that does not cause unnecessary operation even when saturated.
【０００８】[0008]
【課題を解決するための手段】本発明に係る比率差動継
電システムは、発電機、母線、または送電線等の保護継
電装置と同一母線に接続された変圧器保護継電装置内
に、基本波に対する第２高調波の比率が一定値以上の時
出力を出すインラッシュ検出手段を備えると共に、各保
護継電装置内に、上記インラッシュ検出手段の出力がな
く比率差動手段の出力がある時トリップ出力を出すイン
ヒビット手段を備えたことを特徴とするものである。A ratio differential relay system according to the present invention is provided in a transformer protection relay device connected to the same bus as a protection relay device such as a generator, a bus bar, or a transmission line. , The inrush detection means for outputting an output when the ratio of the second harmonic to the fundamental wave is a certain value or more, and there is no output of the inrush detection means in each protective relay device, and the output of the ratio differential means It is characterized by comprising inhibit means for outputting a trip output at a certain time.
【０００９】[0009]
【作用】上記の様に構成された比率差動継電システムに
おいては、変圧器が無負荷投入されインラッシュ電流が
発生すれば、変圧器保護継電装置内のインラッシュ検出
手段がインラッシュを検出し出力を各保護継電装置のイ
ンヒビット手段に転送する。各保護継電装置の比率差動
手段は変流器の飽和による誤差差動電流により不要動作
するが、比率差動検出手段の動作よりも早く転送された
インラッシュ検出信号がインヒビット信号として作用す
るので不要にトリップ出力を出すことはない。In the ratio differential relay system configured as described above, if no load is applied to the transformer and an inrush current is generated, the inrush detection means in the transformer protective relay will detect an inrush. The detected output is transferred to the inhibit means of each protective relay device. The ratio differential means of each protection relay device operates unnecessarily due to the error differential current due to the saturation of the current transformer, but the inrush detection signal transferred earlier than the operation of the ratio differential detection means acts as an inhibit signal. Therefore, trip output is not output unnecessarily.
【００１０】[0010]
【実施例】実施例１．図１と図２は本発明の一実施例の
構成を示す。図５と同一部分は同一符号を付して示す図
１において、発電機Ｇを保護対象とする発電機保護継電
装置ＧＰ内には、比率差動手段８７Ｇの他に、この比率
差動手段８７Ｇの出力と後述する変圧器保護継電装置Ｔ
Ｐのインラッシュ検出手段Ｆ2Hからの信号を受信するた
めのインヒビット手段ＩＮG が備えられている。また、
変圧器ＴＲ側には変圧器保護継電装置ＴＰが設けられ、
変圧器保護継電装置ＴＰには、発電機保護継電装置ＧＰ
の比率差動手段８７Ｇと同様な比率差動手段８７Ｔと、
インラッシュ検出手段Ｆ2H及びインヒビット手段ＩＮT
が備えられている。なお、ＣＴ３、ＣＴ４は変流器を示
す。そして、上記インラッシュ検出手段Ｆ2Hは、図２に
示す様に、インラッシュ入力トランスＴF2、基本波パス
フィルタＦ1P、第２高調波パスフィルタＦ2P、及び第２
高調波比率検出手段ＣＭF2から構成されている。EXAMPLES Example 1. 1 and 2 show the configuration of an embodiment of the present invention. In FIG. 1 in which the same parts as those in FIG. 5 are denoted by the same reference numerals, in the generator protection relay device GP that protects the generator G, in addition to the ratio differential means 87G, this ratio differential means 87G output and transformer protection relay device T described later
Inhibit means IN G for receiving a signal from a P inrush detector F 2H is provided. Also,
A transformer protection relay device TP is provided on the transformer TR side,
The transformer protection relay device TP includes a generator protection relay device GP.
Ratio differential means 87T similar to the ratio differential means 87G,
Inrush detector F 2H and inhibit means IN T
Is provided. CT3 and CT4 are current transformers. The inrush detection means F 2H , as shown in FIG. 2, has an inrush input transformer T F2 , a fundamental wave pass filter F 1P , a second harmonic pass filter F 2P , and a second harmonic pass filter F 2P .
It is composed of the harmonic ratio detection means CM F2 .
【００１１】上記の様に構成された保護継電装置ＴＰ及
びＧＰの動作を説明する。 １）直流分を含んだインラッシュが変流器ＣＴ１、ＣＴ
２を貫通する場合 図３の各部波形図により説明する。変圧器保護継電装置
ＴＰ内の比率差動手段８７Ｔには変流器ＣＴ４の２次側
電流Ｉ4 のみしか流れないので差動電流＝抑制電流とな
り、比率差動手段８７Ｔは動作する。一方、インラッシ
ュ検出手段Ｆ2HにもＣＴ４の２次側電流Ｉ4 が差動電流
として流れる。この電流はインラッシュ電流特有の第２
高調波分を多く含んでおり（一般に基本波成分に対する
第２の高調波成分の比率は１２％以上）比率差動手段８
７Ｔの動作よりも早く、インラッシュ検出手段Ｆ2Hが動
作する。The operation of the protective relays TP and GP configured as above will be described. 1) The inrush including the DC component is the current transformer CT1, CT
Case of penetrating 2 will be described with reference to waveform charts of respective portions in FIG. Since only the secondary side current I 4 of the current transformer CT4 flows through the ratio differential means 87T in the transformer protection relay TP, the differential current = suppressing current, and the ratio differential means 87T operates. On the other hand, the secondary current I 4 of CT4 also flows as a differential current in the inrush detection means F 2H . This current is the second characteristic of inrush current.
It contains a large amount of harmonic components (generally, the ratio of the second harmonic component to the fundamental component is 12% or more). Ratio differential means 8
The inrush detection means F 2H operates earlier than the operation of 7T.
【００１２】従って、比率差動手段８７Ｔは出力を出す
が、インヒビット手段ＩＮT で阻止されるため、変圧器
保護継電装置ＴＰとしてのトリップ出力でない。また同
時に、インラッシュ検出手段Ｆ2Hの出力が発電機保護継
電装置ＧＰにインヒビット信号として比率差動手段８７
Ｇが動作するよりも早く転送されており、発電機保護継
電装置ＧＰの比率差動手段８７Ｇの出力も確実に阻止さ
れ、発電機保護継電装置ＧＰが不要に動作することはな
い。Accordingly, although the ratio differential means 87T issues an output, because it is blocked by the inhibit means IN T, non-trip output as transformer protective relay device TP. At the same time, the output of the inrush detection means F 2H is sent to the generator protection relay device GP as an inhibit signal and the ratio differential means 87.
Since it is transferred faster than G operates, the output of the ratio differential means 87G of the generator protection relay device GP is surely blocked, and the generator protection relay device GP does not operate unnecessarily.
【００１３】２）外部故障Ｆ２発生時 図７（ａ）の従来の場合と同様に、差動電流が流れない
ので、比率差動手段８７Ｇは不動作であり、従ってイン
ラッシュ検出手段Ｆ2Hの出力に拘わらず発電機保護継電
装置ＧＰから従来と同様にトリップ出力は出ない。 ３）内部故障Ｆ１発生時 図７（ｂ）の従来の場合と同様で、流入電流＝差動電流
で比率差動手段８７Ｇが動作、このときインラッシュ検
出手段Ｆ2Hは出力しないので当該発電機保護継電装置Ｇ
Ｐの出力としては、従来と同様にトリップ出力が出力さ
れる。2) When an external failure F2 occurs As in the conventional case of FIG. 7 (a), since no differential current flows, the ratio differential means 87G is inoperative, and therefore the inrush detection means F 2H does not operate. The trip output is not output from the generator protection relay device GP regardless of the output as in the conventional case. 3) When an internal fault F1 occurs As in the conventional case of FIG. 7B, the ratio differential means 87G operates at the inflow current = differential current. At this time, the inrush detection means F 2H does not output, so the generator concerned Protection relay device G
As the output of P, a trip output is output as in the conventional case.
【００１４】実施例２．以上の説明では、変圧器保護継
電装置ＴＰでインラッシュ検出して出力を発電機保護継
電装置ＧＰに転送する場合であったが、図４（ａ）のよ
うに、変圧器保護継電装置ＴＰのインラッシュ検出手段
Ｆ2Hの出力を送電線保護継電装置ＬＰに転送することに
より、直流分を含んだインラッシュ電流ＩE が変流器Ｃ
Ｔ５、ＣＴ６を貫通して送電線保護継電装置ＬＰが不要
動作するのを阻止でき、実施例１と同様の効果が得られ
る。なお、ＢＵＳ１、ＢＵＳ２は母線、ＴＬは被保護送
電線を示す。Example 2. In the above description, the transformer protection relay device TP detects inrush and transfers the output to the generator protection relay device GP. However, as shown in FIG. By transferring the output of the inrush detection means F 2H of the device TP to the transmission line protection relay device LP, the inrush current I E including the DC component is changed to the current transformer C.
Unnecessary operation of the power transmission line protection relay LP passing through T5 and CT6 can be prevented, and the same effect as that of the first embodiment can be obtained. In addition, BUS1 and BUS2 show a bus, and TL shows a protected transmission line.
【００１５】実施例３．図４（ｂ）において、ＢＵＳは
被保護母線、ＴＲ１、ＴＲ２変圧器、ＣＴ１１、ＣＴ１
２、ＣＴ２１、ＣＴ２２、ＣＴ３１、ＣＴ３２、ＣＴ４
１、ＣＴ４２は変流器、ＢＰは母線保護比率差動保護継
電装置を示し、この実施例では、変圧器保護継電装置Ｔ
Ｐ１、ＴＰ２のインラッシュ検出手段Ｆ2H1 、Ｆ2H2 の
出力を母線保護継電装置ＢＰに転送するようにしてい
る。この実施例は、複数のインラッシュ検出信号を一個
の母線保護継電装置に転送する方法であるが、この場合
も直流分を含んだインラッシュ電流ＩE が変流器ＣＴ１
１、ＣＴ１２を貫通して母線保護継電装置ＢＰが不要動
作するのを阻止して、上記各実施例と同様の効果が得ら
れる。Example 3. In FIG. 4B, BUS is a protected bus, TR1, TR2 transformer, CT11, CT1.
2, CT21, CT22, CT31, CT32, CT4
1, CT42 is a current transformer, BP is a busbar protection ratio differential protection relay device, and in this embodiment, a transformer protection relay device T.
The outputs of the inrush detection means F 2H1 and F 2H2 of P1 and TP2 are transferred to the busbar protection relay device BP. This embodiment is a method of transferring a plurality of inrush detection signals to one bus protection relay device. In this case as well, the inrush current I E including the DC component causes the current transformer CT1.
1, the busbar protection relay device BP is prevented from unnecessarily operating by penetrating the CT12, and the same effect as each of the above-described embodiments can be obtained.
【００１６】[0016]
【発明の効果】以上の様に、本発明によれば、変圧器保
護継電装置に設置したインラッシュ検出手段の出力によ
って各保護継電装置の比率差動手段の出力をインヒビッ
トするようにしたので、非常に簡単な機能の追加により
変流器ＣＴ１、ＣＴ２を直流分を含んだインラッシュが
貫通し少なくとも一方のＣＴが飽和する場合でも不要動
作することのない信頼度の高い継電装置を得ることのが
できる。As described above, according to the present invention, the output of the ratio differential means of each protection relay device is inhibited by the output of the inrush detection means installed in the transformer protection relay device. Therefore, by adding a very simple function, a highly reliable relay device that does not operate unnecessarily even when at least one CT is saturated due to the inrush containing the DC component penetrating the current transformers CT1 and CT2. You can get it.
【図１】本発明の実施例１を示す発電機保護継電装置Ｇ
Ｐの構成図である。FIG. 1 is a generator protection relay device G showing a first embodiment of the present invention.
It is a block diagram of P.
【図２】本発明の実施例１のインラッシュ検出手段Ｆ2H
の構成図である。FIG. 2 is an inrush detection means F 2H according to the first embodiment of the present invention.
It is a block diagram of.
【図３】図１と図２の動作を説明する各部の波形図であ
る。FIG. 3 is a waveform diagram of each part for explaining the operation of FIGS. 1 and 2.
【図４】本発明の実施例２と３の送電線保護継電装置Ｌ
Ｐ、母線保護継電装置ＢＰの構成図である。FIG. 4 is a transmission line protection relay device L according to the second and third embodiments of the present invention.
It is a block diagram of P and the busbar protection relay apparatus BP.
【図５】従来の発電機保護継電装置ＧＰの構成図であ
る。FIG. 5 is a configuration diagram of a conventional generator protection relay device GP.
【図６】従来の発電機保護継電装置ＧＰの比率差動手段
８７Ｇの構成図である。FIG. 6 is a configuration diagram of a ratio differential means 87G of a conventional generator protection relay device GP.
【図７】従来の発電機保護継電装置ＧＰの動作原理説明
図である。FIG. 7 is an explanatory diagram of an operation principle of a conventional generator protection relay device GP.
【図８】従来の発電機保護継電装置ＧＰの動作を説明す
る各部の波形図である。FIG. 8 is a waveform diagram of each part for explaining the operation of the conventional generator protection relay device GP.
Ｇ 被保護発電機 ＴＲ 変圧器 ＢＵＳ 母線 ＣＴ１、ＣＴ２、ＣＴ３、ＣＴ４ 変流器 Ｉ1 、Ｉ2 変流器２次側電流 ＩＥ 変圧器のインラッシュ電流 ＴＰ 変圧器保護継電装置 ＧＰ 発電機保護継電装置 ８７Ｇ 発電機保護比率差動手段 ８７Ｔ 変圧器保護比率差動手段 Ｆ2H インラッシュ検出手段 ＴF2 インラッシュ入力トランス Ｆ1P 基本波パスフィルタ Ｆ2P 第２高調波パスフィルタ ＣＭF2 第２高調波比率検出手段 ＩＮG 発電機保護インヒビット手段 ＩＮT 変圧器保護インヒビット手段G Protected generator TR Transformer BUS Bus bar CT1, CT2, CT3, CT4 Current transformer I 1 , I 2 Current transformer secondary side current IE Transformer inrush current TP Transformer protection relay device GP Generator protection Relay device 87G Generator protection ratio differential means 87T Transformer protection ratio differential means F 2H Inrush detection means T F2 Inrush input transformer F 1P fundamental wave pass filter F 2P 2nd harmonic pass filter CM F2 2nd harmonic wave ratio detector IN G generator protection inhibit means IN T transformer protection inhibit means
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【手続補正書】[Procedure amendment]
【提出日】平成３年１１月１日[Submission date] November 1, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００２[Name of item to be corrected] 0002
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００２】[0002]
【従来の技術】従来、この種の装置として図５ないし図
７に示すものがある。図５は発電機保護継電装置ＧＰの
外部接続図、図６は発電保護継電装置ＧＰに使用される
比率差動手段８７Ｇの内部ブロック図、図７は比率差動
手段８７Ｇの比率差動特性図を示し、図５において、Ｂ
ＵＳは電力系統の母線、Ｇは被保護発電機、ＴＲは被保
護発電機Ｇと同一の母線に接続された変圧器、Ｌは変圧
器ＴＲの負荷、ＣＢ１、ＣＢ２、ＣＢ３は遮断器、ＣＴ
１、ＣＴ２は変流器、ＧＰは発電機保護継電装置、ＩE
は変圧器ＴＲを遮断器ＣＢ２により無負荷投入した時の
インラッシュ電流、Ｉ1 、Ｉ2 は変流器ＣＴ１、ＣＴ２
の２次側電流である。また、図６において、Ｉd は差動
電流、Ｃ１、Ｃ２、Ｃ３は比率差動手段８７Ｇの入力端
子、ＴRCは抑制電流（Ｉ1 ＋Ｉ2 ）を導入する抑制入力
トランス、ＴOCは差動電流を導入する差動入力トラン
ス、ＣＭは比率差動特性を得るための比較手段で、抑制
電流に対する差動電流の比率が一定値以上の時、すなわ
ち Ｋ＝差動電流／抑制電流＝Ｉd ／（Ｉ1 ＋Ｉ2 ）＝（Ｉ1 −Ｉ2 ）／（Ｉ1 ＋ Ｉ2 ）＞ＫS （例えばＫS ＝０．１） で動作する。2. Description of the Related Art Conventionally, an apparatus of this type is shown in FIGS. Figure 5 is <br/> outer part connection diagram of the generator protective relay device GP, 6 internal block diagram of the ratio differential means 87G which is used for power generation protective relay device GP, 7 ratio differential means 87G shows a ratio differential characteristic diagram of 87G, and in FIG.
US is the bus of the power system, G is the protected generator, TR is the transformer connected to the same bus as the protected generator G, L is the load of the transformer TR, CB1, CB2 and CB3 are circuit breakers, CT
1, CT2 is a current transformer, GP is a generator protection relay device, IE
Is the inrush current when the transformer TR is turned on without load by the breaker CB2, and I 1 and I 2 are the current transformers CT1 and CT2.
Is the secondary side current. In FIG. 6, I d is a differential current, C1, C2 and C3 are input terminals of the ratio differential means 87G, T RC is a suppression input transformer for introducing a suppression current (I 1 + I 2 ), and T OC is a difference. A differential input transformer for introducing a dynamic current, CM is a comparison means for obtaining a ratio differential characteristic, and when the ratio of the differential current to the suppression current is a certain value or more, that is, K = differential current / suppression current = I operating at d / (I 1 + I 2 ) = (I 1 -I 2) / (I 1 + I 2)> K S ( e.g. K S = 0.1).
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１２】従って、比率差動手段８７Ｔは出力を出す
が、インヒビット手段ＩＮT で阻止されるため、変圧器
保護継電装置ＴＰとしてのトリップ出力は出ない。また
同時に、インラッシュ検出手段Ｆ2Hの出力が発電機保護
継電装置ＧＰにインヒビット信号として比率差動手段８
７Ｇが動作するよりも早く転送されており、発電機保護
継電装置ＧＰの比率差動手段８７Ｇの出力も確実に阻止
され、発電機保護継電装置ＧＰが不要に動作することは
ない。Accordingly, although the ratio differential means 87T issues an output, because it is blocked by the inhibit means IN T, have Na output is trip output as transformer protective relay device TP. At the same time, the output of the inrush detection means F 2H is sent to the generator protection relay device GP as an inhibit signal and the ratio differential means 8 is output.
Since the data is transferred earlier than the 7G operates, the output of the ratio differential means 87G of the generator protection relay GP is also reliably blocked, and the generator protection relay GP does not operate unnecessarily.
Claims (1)
は送電線等被保護対象の両端にそれぞれ少なくとも２個
の変流器を設置し、これら変流器による差動電流の抑制
電流に対する比率に基づきトリップ出力を送出する比率
差動手段を有する保護継電装置を被保護対象毎に備えた
比率差動継電システムにおいて、発電機、母線、または
送電線の保護継電装置と同一の母線に接続された変圧保
護継電装置内に、基本波に対する第２高調波成分の比率
が一定値以上の時出力を出すインラッシュ検出手段を設
けると共に、各保護継電装置に、上記変圧保護継電装置
内から転送されたインラッシュ検出手段の出力が無く、
当該保護継電装置内の比率差動手段の出力がある時トリ
ップ出力を出すインヒビット手段を備えたことを特徴と
する比率差動継電システム。Claims: 1. At least two current transformers are installed at both ends of a protected object such as a generator, a transformer, a bus bar, or a transmission line of a power system, and the difference caused by these current transformers is set. Protection of a generator, a bus bar, or a transmission line in a ratio differential relay system that includes a protection relay device having a ratio differential unit that outputs a trip output based on the ratio of the dynamic current to the suppression current In the transformer protection relay device connected to the same bus as the relay device, an inrush detection means for outputting an output when the ratio of the second harmonic component to the fundamental wave is equal to or more than a certain value is provided, and each protection relay device is provided. The device does not have the output of the inrush detection means transferred from within the transformer protection relay device,
A ratio differential relay system comprising inhibit means for outputting a trip output when an output of the ratio differential device in the protection relay device is present.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3194832A JP2675207B2 (en) | 1991-07-09 | 1991-07-09 | Ratio differential relay system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3194832A JP2675207B2 (en) | 1991-07-09 | 1991-07-09 | Ratio differential relay system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0522839A true JPH0522839A (en) | 1993-01-29 |
| JP2675207B2 JP2675207B2 (en) | 1997-11-12 |
Family
ID=16331006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3194832A Expired - Fee Related JP2675207B2 (en) | 1991-07-09 | 1991-07-09 | Ratio differential relay system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2675207B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170204868A1 (en) * | 2014-07-14 | 2017-07-20 | Kabushiki Kaisha Toyota Jidoshokki | Electric supercharger |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5839221A (en) * | 1981-09-01 | 1983-03-07 | 株式会社東芝 | Protective relay unit |
| JPS61173628A (en) * | 1985-01-28 | 1986-08-05 | 株式会社日立製作所 | Main circuit protector |
-
1991
- 1991-07-09 JP JP3194832A patent/JP2675207B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5839221A (en) * | 1981-09-01 | 1983-03-07 | 株式会社東芝 | Protective relay unit |
| JPS61173628A (en) * | 1985-01-28 | 1986-08-05 | 株式会社日立製作所 | Main circuit protector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170204868A1 (en) * | 2014-07-14 | 2017-07-20 | Kabushiki Kaisha Toyota Jidoshokki | Electric supercharger |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2675207B2 (en) | 1997-11-12 |
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