JPH0232852B2 - - Google Patents
Info
- Publication number
- JPH0232852B2 JPH0232852B2 JP56199668A JP19966881A JPH0232852B2 JP H0232852 B2 JPH0232852 B2 JP H0232852B2 JP 56199668 A JP56199668 A JP 56199668A JP 19966881 A JP19966881 A JP 19966881A JP H0232852 B2 JPH0232852 B2 JP H0232852B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- voltage
- relay
- saturable reactor
- overcurrent
- 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.)
- Expired - Lifetime
Links
- 230000004907 flux Effects 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
この発明は、電力系統の母線等を事故から保護
するための差動保護継電装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a differential protection relay device for protecting bus bars and the like of a power system from accidents.
従来、この種の装置として第１図に示すものが
あつた。１は保護対象の母線、２−１〜２−ｎは
母線１に接続された回線、３−１〜３−ｎは回線
２−１〜２−ｎ上に設けられた変流器、４は変流
器３−１〜３−ｎの２次側に接続された電圧差動
リレー、５は過電流リレー、６は過電流リレー５
を介して電圧差動リレー４に並列に接続された抵
抗素子で、印加される電圧が所定値以上となると
抵抗値を減少させる非直線性特性を有し、例えば
バリスターの名で販売されている。 Conventionally, there has been a device of this type as shown in FIG. 1 is the bus to be protected, 2-1 to 2-n are the lines connected to bus 1, 3-1 to 3-n are current transformers installed on the lines 2-1 to 2-n, and 4 is the current transformer installed on the lines 2-1 to 2-n. Voltage differential relays connected to the secondary sides of current transformers 3-1 to 3-n, 5 is an overcurrent relay, 6 is an overcurrent relay 5
A resistive element connected in parallel to the voltage differential relay 4 through There is.
次に動作について説明する。変流器３−１〜３
−ｎの２次側の電流I2から分流された電流IRは高
入力インピーダンスをもつ電圧差動リレー４に導
かれる。母線１の外部事故時は母線１に流入する
電流の和と、母線１から事故点に向つて流出する
電流の和が等しいため、電圧差動リレー４に導か
れた電流IRはその応動レベル以下にある。 Next, the operation will be explained. Current transformer 3-1~3
The current I R shunted from the current I 2 on the secondary side of -n is led to a voltage differential relay 4 with a high input impedance. When an external fault occurs on the bus 1, the sum of the current flowing into the bus 1 and the sum of the current flowing out from the bus 1 toward the fault point are equal, so the current I R led to the voltage differential relay 4 is at its response level. It's below.
しかし、母線１の内部事故時は母線１から流出
する電流がないので、電圧差動リレー４に導かれ
る電流IRのレベルが応動レベル以上となり、これ
が応動する。電圧差動リレー４の入力インピーダ
ンスは非常に高いため、その入力端に発生する電
圧V2も相当に高いレベルに達する。 However, in the event of an internal fault in the bus bar 1, no current flows out from the bus bar 1, so the level of the current I R led to the voltage differential relay 4 becomes equal to or higher than the response level, and this reacts. Since the input impedance of the voltage differential relay 4 is very high, the voltage V 2 generated at its input terminal also reaches a fairly high level.
このような状態になると、抵抗素子６の抵抗値
が減少し、これに流れ込む電流IVが増大し、この
電流IVが所定レベル以上となると、過電流リレー
５が動作する。このようにして過電流リレー５は
電圧差動リレー４のバツクアツプ動作をする。 In such a state, the resistance value of the resistance element 6 decreases, and the current IV flowing into it increases. When this current IV exceeds a predetermined level, the overcurrent relay 5 is activated. In this manner, overcurrent relay 5 performs a backup operation of voltage differential relay 4.
変流器３−１〜３−ｎの２次励磁インピーダン
ス７−１〜７−ｎには電流Iex1〜Iexoが流れる。
母線１の内部事故時に変流器３−１より事故電流
Ｉが供給されると、この事故電流Ｉは２次励磁イ
ンピーダンス７−１〜７−ｎ、電圧差動リレー４
及び抵抗素子６に流れる電流Iex1〜Iexo、I2（IR及
びIV）に分流される。 Currents I ex1 to I exo flow through the secondary excitation impedances 7-1 to 7-n of the current transformers 3-1 to 3-n.
When a fault current I is supplied from the current transformer 3-1 at the time of an internal fault in the bus 1, this fault current I flows through the secondary excitation impedances 7-1 to 7-n and the voltage differential relay 4.
The currents I ex1 to I exo and I 2 (I R and I V ) flowing through the resistance element 6 are shunted.
第３図において、φは変流器３−１〜３−ｎの
磁束である。磁束φと変流器の２次誘起電圧E2
との間には、周知のようにE2＝N2dφ／dt（N2は変
流器３−１〜３−ｎの２次巻線数）の関係があ
る。E2＝R2I（R2は変流器３−１〜３−ｎの２次
側の負荷）であるため、φ＝K∫Idtとなるが、電
圧V2が大きいため、磁束φはすぐに飽村して磁
束φsとなり、dφ／dtは零となる。 In FIG. 3, φ is the magnetic flux of current transformers 3-1 to 3-n. Magnetic flux φ and secondary induced voltage of current transformer E 2
As is well known, there is a relationship of E 2 =N 2 dφ/dt (N 2 is the number of secondary windings of current transformers 3-1 to 3-n). Since E 2 = R 2 I (R 2 is the load on the secondary side of current transformers 3-1 to 3-n), φ = K∫Idt, but since the voltage V 2 is large, the magnetic flux φ is It soon becomes saturated and becomes magnetic flux φs, and dφ/dt becomes zero.
したがつて、２次誘起電圧E2及び電圧V2も零
になり、電流I2は事故電流Ｉに比例しないものと
なり、電流Iex1〜Iexoがその分だけ大きくなる。 Therefore, the secondary induced voltage E 2 and the voltage V 2 also become zero, the current I 2 becomes not proportional to the fault current I, and the currents I ex1 to I exo increase accordingly.
以上の説明から明らかなように、電圧差動リレ
ー４に印加される電圧V2は、事故電流Ｉが０の
時点から磁束φが飽和するまでの期間のものであ
る。また、過電流リレー５に流れる電流IVは、抵
抗素子６が飽和した時点から磁束φが飽和するま
でのものである。 As is clear from the above description, the voltage V 2 applied to the voltage differential relay 4 is for the period from when the fault current I is 0 until the magnetic flux φ is saturated. Further, the current IV flowing through the overcurrent relay 5 is from the time when the resistive element 6 is saturated until the magnetic flux φ is saturated.
このような電圧V2及び電流IVは電圧差動リレ
ー４及び過電流リレー５の応動レベルに達してい
ても、これらが応動し得ない短期間のものとなる
危険性がある。 Even if such voltage V 2 and current I V reach the response level of voltage differential relay 4 and overcurrent relay 5, there is a risk that these will be short-lived and cannot respond.
なお、過電流リレー５に流れる電流IVは第３図
からも明らかなように、電圧V2が一定値以上と
なつた時にのみに生じるものであるため、電圧差
動リレー４に印加される入力より条件は悪く、過
電流リレー５は動作しにくいので、電圧差動リレ
ー４の動作信頼度をカバーする目的としては不充
分である。 Note that, as is clear from FIG. 3, the current I V flowing through the overcurrent relay 5 is generated only when the voltage V 2 exceeds a certain value; Since the conditions are worse than the input, and the overcurrent relay 5 is difficult to operate, it is insufficient for the purpose of covering the operational reliability of the voltage differential relay 4.
従来の差動継電装置は以上のように構成を有す
るので、電圧差動リレーと過電流リレーとの協働
が容易でなく、過電流リレー５を設けた効果が低
いものであつた。 Since the conventional differential relay device has the configuration as described above, it is not easy for the voltage differential relay and the overcurrent relay to work together, and the effect of providing the overcurrent relay 5 is low.
この発明は、上記のような従来の欠点を解消す
るためになされたもので、可飽和リアクトルとこ
れに流れる電流を検出する過電流リレーを設ける
ことにより、電圧差動リレー用入力が消滅する飽
和期間でも確実に動作信号が得られる信頼性の高
い差動保護継電装置を得ることを目的とする。 This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.By providing a saturable reactor and an overcurrent relay that detects the current flowing through the reactor, the input for the voltage differential relay disappears. It is an object of the present invention to provide a highly reliable differential protection relay device that can reliably obtain an operating signal even during periods.
以下、この発明の一実施例を図について説明す
る。第２図において、８は可飽和リアクトルであ
り、過電流リレー５を介して電圧差動リレー４の
入力端に並列接続され、抵抗素子６もこれに並列
接続され、飽和電圧値が変流器３−１〜３−ｎの
ものよりも低く、かつ電圧差動リレー４の動作値
より高い特性をもつ。 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, 8 is a saturable reactor, which is connected in parallel to the input terminal of the voltage differential relay 4 via an overcurrent relay 5, and a resistance element 6 is also connected in parallel to this, so that the saturation voltage value is equal to the current transformer. It has characteristics lower than those of 3-1 to 3-n and higher than the operating value of the voltage differential relay 4.
次に動作について説明する。母線１の外部事故
のときは、第１図で説明した従来装置と同じよう
に、事故電流Ｉは変流器３−１〜３−ｎ間を環流
し電圧Ｖはほとんど発生しないため、電圧差動リ
レー４及び過電流リレー５は動作しない。 Next, the operation will be explained. In the event of an external fault on the bus 1, the fault current I circulates between the current transformers 3-1 to 3-n and almost no voltage V is generated, as in the conventional device explained in Fig. 1, so the voltage difference is dynamic relay 4 and overcurrent relay 5 do not operate.
母線１の内部事故のときは次のようになる。電
源端の変流器３−１から流入する事故電流Ｉは、
電圧差動リレー４に流れる電流IR、抵抗素子６に
流れる電流IV、可飽和リアクトル８に流れる電流
IL（第３図参照）及び２次励磁インピーダンス７
−１〜７−ｎを流れる電流Iex1〜Iexoに分流され、
これらの電流の値は変流器２次回路の電圧Ｖ（第
３図の電圧V2に対応する）で決定される。 In the event of an internal accident on bus 1, the following will occur. The fault current I flowing from the current transformer 3-1 at the power supply end is:
Current I R flowing through voltage differential relay 4, current I V flowing through resistance element 6, and current flowing through saturable reactor 8.
I L (see Figure 3) and secondary excitation impedance 7
The current flowing through -1 to 7-n is shunted into I ex1 to I exo ,
The values of these currents are determined by the voltage V (corresponding to voltage V 2 in FIG. 3) of the current transformer secondary circuit.
可飽和リアクトル８に流れる電流ILは電流Iex1
〜Iexoと同じような特性を有する。即つ、可飽和
リアクトル８を設けたことは、特性の異なる変流
器を１次追加したことと同じことになる。それら
の間の相違点は、可飽和リアクトル８の飽和電圧
値が変流器３−１のものよりも低いということだ
けである。 The current I L flowing through the saturable reactor 8 is the current I ex1
~I Has similar properties to exo . That is, providing the saturable reactor 8 is equivalent to adding a primary current transformer with different characteristics. The only difference between them is that the saturation voltage value of the saturable reactor 8 is lower than that of the current transformer 3-1.
このような相違により、電圧Ｖの発生期間Ｔは
可飽和リアクトル８の不飽和期間で決定される。
電圧差動リレー４は抵抗素子６の特性と可飽和リ
アクトル８の特性で決定される電圧Ｖを検出する
ことになり、過電流リレー５は可飽村リアクトル
８に印加される電圧Ｖが飽和電圧に達した時から
急激に流れ始める電流LLを検出するものである。 Due to such a difference, the generation period T of the voltage V is determined by the unsaturated period of the saturable reactor 8.
The voltage differential relay 4 detects the voltage V determined by the characteristics of the resistive element 6 and the saturable reactor 8, and the overcurrent relay 5 detects the voltage V applied to the saturable reactor 8 so that the voltage V is the saturation voltage. This is to detect the current L L that starts flowing rapidly when the current L L is reached.
即ち、可飽和リアクトル８が飽和すると、事故
電流Ｉはほぼその全てが可飽和リアクトル８に流
れ込み、ＩILとなり、過電流リレー５は十分に
応動可能となる。 That is, when the saturable reactor 8 is saturated, almost all of the fault current I flows into the saturable reactor 8, becoming II L , and the overcurrent relay 5 can sufficiently respond.
第３図の波形から明らかなように、電圧Ｖと電
流IL（本発明によれば、この時IL≫ΣIex）との発
生時間は互に相関しているので、可飽和リアクト
ル８の不飽和期間は電流ILが小さく、過電流リレ
ー５は動作していないが、電圧Ｖは大きいため電
圧差動リレー４が確実に動作し、可飽和リアクト
ル８が飽和し始めて電圧Ｖが小さくなれが、電流
ILが大きくなるため、過電流リレー５が確実に動
作する。したがつて、電圧差動リレー４の出力と
過電流リレー５の出力を並列使用すれば、出力が
途切れることなく確実に動作出力を発生させるこ
とができる。 As is clear from the waveforms in FIG. 3, the generation times of the voltage V and the current I L (according to the present invention, at this time I L ≫ΣIex) are correlated with each other, so the saturable reactor 8 is During the saturation period, the current I L is small and the overcurrent relay 5 is not operating, but since the voltage V is large, the voltage differential relay 4 operates reliably, and the saturable reactor 8 begins to saturate, causing the voltage V to become small. , current
Since I L becomes large, the overcurrent relay 5 operates reliably. Therefore, by using the output of the voltage differential relay 4 and the output of the overcurrent relay 5 in parallel, it is possible to reliably generate an operating output without interruption of the output.
なお、抵抗素子６を可飽和リアクトル８に並列
接続し、両者の合成電流が過電流リレー５に流れ
るようにしても上記実施例と同様な効果を奏す
る。 Note that even if the resistance element 6 is connected in parallel to the saturable reactor 8 and the combined current of both flows to the overcurrent relay 5, the same effect as in the above embodiment can be obtained.
以上のように、この発明によれば、内部事故時
に電圧差動リレー入力が消滅し始める飽和域にお
いても、過電流リレーが引続き動作してきて、電
圧差動リレーの出力を補償できる構成としたの
で、確実な動作出力が得られ差動保護継電装置の
信頼性を高める効果がある。 As described above, according to the present invention, even in the saturation region where the voltage differential relay input begins to disappear in the event of an internal fault, the overcurrent relay continues to operate and the output of the voltage differential relay can be compensated. This has the effect of providing a reliable operating output and increasing the reliability of the differential protection relay device.
第１図は従来の差動保護継電装置の回路図、第
２図はこの発明の一実施例による差動保護継電装
置の回路図、第３図は第１図及び第２図に示す差
動保護継電装置の動作を説明する波形図である。
１……母線、３−１〜３−ｎ……変流器、４…
…電圧差動リレー、５……過電流リレー、６……
抵抗素子、８……可飽和リアクトル。なお、図
中、同一符号は同一、又は相当部分を示す。
Fig. 1 is a circuit diagram of a conventional differential protection relay device, Fig. 2 is a circuit diagram of a differential protection relay device according to an embodiment of the present invention, and Fig. 3 is shown in Figs. 1 and 2. FIG. 3 is a waveform diagram illustrating the operation of the differential protection relay device. 1...Bus bar, 3-1 to 3-n...Current transformer, 4...
...Voltage differential relay, 5... Overcurrent relay, 6...
Resistance element, 8...Saturable reactor. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
互に並列接続した複数の変流器と、高入力インピ
ーダンスを有し上記変流器の２次側に接続された
電圧差動リレーと、流入する電流が所定値以上と
なつたときに応動する過電流リレーと、上記変流
器の飽和電圧より低く、かつ、上記差動電圧リレ
ーが応動する電圧より高い値の飽和電圧を有する
可飽和リアクトルとを備え、上記の過電流リレー
と可飽和リアクトルを直列に接続して上記差動電
圧リレーと並列に接続したことを特徴とする差動
保護継電装置。1. A plurality of current transformers installed in each line connected to the busbar and having their secondary sides connected in parallel to each other, and a voltage differential relay having high input impedance and connected to the secondary side of the current transformer. , an overcurrent relay that responds when the inflow current exceeds a predetermined value, and a saturation voltage that is lower than the saturation voltage of the current transformer and higher than the voltage that the differential voltage relay responds to. a saturable reactor, the overcurrent relay and the saturable reactor are connected in series and connected in parallel to the differential voltage relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56199668A JPS5899219A (en) | 1981-12-09 | 1981-12-09 | Differential protecting relay unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56199668A JPS5899219A (en) | 1981-12-09 | 1981-12-09 | Differential protecting relay unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5899219A JPS5899219A (en) | 1983-06-13 |
| JPH0232852B2 true JPH0232852B2 (en) | 1990-07-24 |
Family
ID=16411632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56199668A Granted JPS5899219A (en) | 1981-12-09 | 1981-12-09 | Differential protecting relay unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5899219A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5239150A (en) * | 1975-09-22 | 1977-03-26 | Mitsubishi Electric Corp | Voltage differential protection relay |
-
1981
- 1981-12-09 JP JP56199668A patent/JPS5899219A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5239150A (en) * | 1975-09-22 | 1977-03-26 | Mitsubishi Electric Corp | Voltage differential protection relay |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5899219A (en) | 1983-06-13 |
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