JPH0715863A - Transformer protective relay device - Google Patents
Transformer protective relay deviceInfo
- Publication number
- JPH0715863A JPH0715863A JP5266780A JP26678093A JPH0715863A JP H0715863 A JPH0715863 A JP H0715863A JP 5266780 A JP5266780 A JP 5266780A JP 26678093 A JP26678093 A JP 26678093A JP H0715863 A JPH0715863 A JP H0715863A
- Authority
- JP
- Japan
- Prior art keywords
- ratio
- current
- phases
- transformer
- relay element
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は比率差動継電器等を用い
て変圧器の保護を行う変圧器保護継電装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer protection relay device for protecting a transformer by using a ratio differential relay or the like.
【０００２】[0002]
【従来の技術】従来の変圧器保護継電装置は例えば図４
のように構成されていた。図４において１，２，３は３
相各相毎に設けられた比率差動継電要素であり、差電流
１ｄと抑制電流Ｉｒの比によって動作する。これら比率
差動継電要素１，２，３の出力信号は反転入力端子付ア
ンド回路４，５，６の非反転入力端子に各々供給され
る。７，８，９は３相各相毎に設けられた第２高調波ロ
ック要素であり、差電流１ｄに含まれる基本波分電流と
第２高調波分電流の比によって動作する。これら第２高
調波ロック要素７，８，９の出力信号は前記アンド回路
４，５，６の反転入力端子に供給される。前記アンド回
路４，５，６の出力はオア回路１０を介して、変圧器と
電力系統を結ぶ電路に介挿された図示しないしゃ断器の
トリップ信号となる。尚図中の（ ）内の文字は３相の
相別を示している。2. Description of the Related Art A conventional transformer protection relay device is shown in FIG.
Was configured like. In FIG. 4, 1, 2, 3 is 3
It is a ratio differential relay element provided for each phase and operates according to the ratio between the difference current 1d and the suppression current Ir. The output signals of these ratio differential relay elements 1, 2 and 3 are supplied to the non-inverting input terminals of the AND circuits 4, 5 and 6 with inverting input terminals, respectively. Reference numerals 7, 8 and 9 denote second harmonic lock elements provided for each of the three phases, and operate according to the ratio of the fundamental wave component current and the second harmonic component current included in the difference current 1d. The output signals of these second harmonic lock elements 7, 8 and 9 are supplied to the inverting input terminals of the AND circuits 4, 5 and 6. The outputs of the AND circuits 4, 5, 6 become trip signals of a circuit breaker (not shown) inserted in an electric circuit connecting the transformer and the electric power system via the OR circuit 10. The characters in parentheses in the figure indicate the three phases.
【０００３】図４のように構成された装置において、差
電流１ｄは変圧器に流入する電流と流出する電流の差電
流であり、常時はほぼ零となる。また抑制電流Ｉｒは変
圧器各端子のスラカー和を使用するのが一般的である。
比率差動継電要素１，２，３は図５（ａ）の動作特性の
ようにＩｄ／Ｉｒが所定の値以上になったときに動作す
る。第２高調波ロック要素７，８，９は図５（ｂ）の動
作特性のように例えば差電流Ｉｄに含まれる第２高調波
分電流Ｉｆ2と基本波分電流Ｉｆ1の比Ｉｆ2／Ｉｆ1が
０．１３以上になった時に動作する。In the device constructed as shown in FIG. 4, the difference current 1d is the difference current between the current flowing into the transformer and the current flowing out of the transformer, and is almost zero at all times. Further, the suppression current Ir generally uses the slacker sum of each terminal of the transformer.
The ratio differential relay elements 1, 2 and 3 operate when Id / Ir exceeds a predetermined value as shown in the operating characteristic of FIG. The second harmonic locking element 7, 8, 9 5 second harmonic Namibun current included in the example differential current Id as the operating characteristics of (b) the If 2 basic Namibun current the If 1 ratio the If 2 / It operates when If 1 exceeds 0.13.
【０００４】変圧器内部事故時は、差電流Ｉｄが増加し
て該当する相の比率差動継電要素が動作し、該当する相
のアンド回路の比反転入力端子がハイレベルとなる。一
方このとき全てのＩｆ2／Ｉｆ1が０．１３以上になるこ
とはないので、第２高調波ロック要素（７，８，９）が
不動作となり前記アンド回路（４，５，６）の反転入力
端子はローレベルとなる。このためアンド回路（４，
５，６）のアンド条件が成立し、トリップロックがかか
ることなくしゃ断器のトリップが行われる。In the event of an internal failure of the transformer, the differential current Id increases, the ratio differential relay element of the corresponding phase operates, and the ratio inverting input terminal of the AND circuit of the corresponding phase becomes high level. On the other hand, at this time, all If 2 / If 1 never exceed 0.13, so the second harmonic lock element (7,8,9) becomes inoperative and the AND circuit (4,5,6) The inverting input terminal becomes low level. Therefore, the AND circuit (4,
The AND conditions of 5 and 6) are satisfied, and the circuit breaker trips without trip lock.
【０００５】また変圧器投入時には励磁突入電流が差電
流Ｉｄとして流れるが、この突入電流には第２高調波分
電流Ｉｆ2が多く含まれているので、Ｉｆ2／Ｉｆ1＞
０．１３なる条件が成立する。このため第２高調波ロッ
ク要素（７，８，９）が動作して前記アンド回路４，
５，６のアンド条件を不成立とし、トリップ出力をロッ
クする。尚、このトリップロックがかかる前に比率差動
継電要素１，２，３が動作するとミストリップ信号を出
力してしまうので、比率差動継電要素１，２，３の動作
時間を遅らせることによってミストリップ信号が出ない
ように時限協調をとっている。When the transformer is turned on, the exciting inrush current flows as a difference current Id. Since this inrush current contains a large amount of the second harmonic component current If 2 , If 2 / If 1 >
The condition of 0.13 is satisfied. Therefore, the second harmonic lock element (7, 8, 9) operates to operate the AND circuit 4,
The AND conditions of 5 and 6 are not satisfied and the trip output is locked. If the ratio differential relay elements 1, 2 and 3 operate before the trip lock is applied, a mistrip signal is output. Therefore, the operation time of the ratio differential relay elements 1, 2, and 3 should be delayed. The time coordination is done so that the missrip signal is not output.
【０００６】[0006]
【発明が解決しようとする課題】（１）励磁突入電流に
含まれるＩｆ2分は残留磁気、投入位相、鉄心の構造
等、様々な要因によって変化するので、あらゆるケース
で３相とも第２高調波ロック要素（７，８，９）の動作
条件（Ｉｆ2／Ｉｆ1＞０．１３）を満足するとは限らな
い。特に最近は第２高調波分電流Ｉｆ2の含有率が小さ
くなってきており、図４に示す外相ロック方式では、動
作条件をＩｆ2／Ｉｆ1＞０．１程度にしないと、励磁突
入電流により不要トリップ出力を出すケースもある。(1) If 2 contained in the magnetizing inrush current varies depending on various factors such as remanent magnetism, closing phase, iron core structure, etc. Therefore, in all cases, all three phases have the second harmonic. The operating condition (If 2 / If 1 > 0.13) of the wave locking element (7, 8, 9) is not always satisfied. In particular, recently, the content rate of the second harmonic component current If 2 has become smaller, and in the external phase lock method shown in FIG. 4, unless the operating conditions are set to If 2 / If 1 > 0.1, the exciting inrush current is increased. In some cases, unnecessary trip output is output.
【０００７】しかしながら上記のように第２高調波ロッ
ク要素（７，８，９）のＩｆ2／Ｉｆ1検出の値を低く設
定していくと、比率差動継電要素（１，２，３）の保護
領域である変圧器内部事故時に過渡的に含まれるＩｆ2
分により、比率差動継電要素の動作が一時的にロックさ
れる危険性が増大する。このため比率差動継電要素の動
作時間が遅れてしまい、事故除去時間が長くなるという
問題がある。However, if the value of the If 2 / If 1 detection of the second harmonic lock element (7,8,9) is set low as described above, the ratio differential relay element (1,2,3) is set. ) is a protected area of the If 2 included in transient during transformer internal fault
This increases the risk of temporarily locking the operation of the ratio differential relay element. Therefore, there is a problem that the operating time of the ratio differential relay element is delayed and the accident elimination time becomes long.
【０００８】（２）図４の方式はＩｆ2／Ｉｆ1が所定値
以上になった時に比率差動継電要素の出力をロックする
という方式をとっているので、励磁突入のあらゆるケー
スで第２高調波ロック要素よりも比率差動継電要素の方
が遅く動作するという時間協調をとる必要がある。(2) Since the system of FIG. 4 employs a system of locking the output of the ratio differential relay element when If 2 / If 1 exceeds a predetermined value, it is the first method in all cases of inrush of excitation. It is necessary to coordinate the time that the ratio differential relay element operates slower than the two-harmonic lock element.
【０００９】ところが励磁突入電流は様々な要因によっ
て変化し、更にＩｆ2分が少なくなってＩｆ2／Ｉｆ1が
設定値に近いケースでは第２高調波ロック要素の動作時
間がますます遅くなってくるので、比率差動継電要素の
動作時間をさらに遅らせる必要があり事故除去時間が長
くなってしまう。However, the exciting inrush current changes due to various factors, and if If 2 is further reduced and If 2 / If 1 is close to the set value, the operating time of the second harmonic lock element is further delayed. Therefore, it is necessary to further delay the operation time of the ratio differential relay element, which increases the accident elimination time.
【００１０】本発明は上記の点に鑑みてなされたもので
その目的は、事故除去時間の遅れがなく、保護の信頼性
の高い変圧器保護継電装置を提供することにある。The present invention has been made in view of the above points, and an object thereof is to provide a transformer protection relay device with high reliability of protection without delay in accident elimination time.
【００１１】[0011]
【課題を解決するための手段】本発明は、保護対象変圧
器に流入流出する電流の差電流と抑制電流の比が所定値
以上のときに動作する比率差動継電要素を有し、該比率
差動継電要素の動作出力によって、前記変圧器に接続さ
れたしゃ断器をトリップして保護を行う変圧器保護継電
装置において、（１）保護対象変圧器が接続される３相
各相に各々設けられ、前記差電流と抑制電流の比が所定
値以上のときに動作する比率差動継電要素と、前記差電
流中の基本波成分の３相分の合計値と、前記差電流中の
第２高調波成分の３相分の合計値との比が所定値以下で
あり、且つ前記基本波成分の３相分の合計値が設定電流
値以上であるときに動作する第２高調波抑制機能付３相
過電流継電要素と、前記第２高調波抑制機能付３相過電
流継電要素の動作出力と、前記３相各相の比率差動継電
要素の動作出力との論理積を各々求めるアンド回路とを
備え、前記各アンド回路のうち少なくともいずれか１個
のアンド回路のアンド条件が成立したときに前記しゃ断
器をトリップすることを特徴とし、（２）保護対象変圧
器が接続される３相各相に各々設けられ、前記差電流と
抑制電流の比が所定値以上のときに動作する比率差動継
電要素と、前記差電流中の基本波成分であって、３相各
相を２乗したものの合計値の平方根と、前記差電流中の
第２高調波成分であって、３相各相を２乗したものの合
計値の平方根との比が所定値以下であり、且つ前記基本
波成分の３相分の合計値が設定電流値以上であるときに
動作する第２高調波抑制機能付３相過電流継電要素と、
前記第２高調波抑制機能付３相過電流継電要素の動作出
力と、前記３相各相の比率差動継電要素の動作出力との
論理積を各々求めるアンド回路とを備え、前記各アンド
回路のうち少なくともいずれか１個のアンド回路のアン
ド条件が成立したときに前記しゃ断器をトリップするこ
とを特徴としている。SUMMARY OF THE INVENTION The present invention has a ratio differential relay element which operates when the ratio of the difference current between the current flowing in and out of the transformer to be protected and the suppression current is equal to or greater than a predetermined value. In a transformer protection relay device for tripping and protecting a circuit breaker connected to the transformer according to an operation output of a ratio differential relay element, (1) each of three phases to which a transformer to be protected is connected And a differential differential relay element that is operated when the ratio of the differential current and the suppression current is equal to or greater than a predetermined value, a total value of three phases of the fundamental wave component in the differential current, and the differential current. The second harmonic that operates when the ratio of the second harmonic component in the three phases to the total value for the three phases is less than or equal to a predetermined value and the total value for the three phases of the fundamental wave component is greater than or equal to the set current value. Operation of 3-phase overcurrent relay element with wave suppression function and the above-mentioned 3-phase overcurrent relay element with second harmonic suppression function And an AND circuit for obtaining a logical product of the operation output of the ratio differential relay element of each of the three phases, and the AND condition of at least one AND circuit of the AND circuits is satisfied. (2) is provided in each of the three phases to which the transformer to be protected is connected, and operates when the ratio of the differential current to the suppression current is a predetermined value or more. A ratio differential relay element, a fundamental wave component in the difference current, which is a square root of a sum of squared phases of three phases, and a second harmonic component in the difference current, The second harmonic that operates when the ratio of the square value of the sum of the squares of the three phases to the square root is less than or equal to a predetermined value, and the total value of the three phases of the fundamental wave component is greater than or equal to the set current value. 3-phase overcurrent relay element with suppression function,
And an AND circuit for obtaining a logical product of the operation output of the three-phase overcurrent relay element with the second harmonic suppression function and the operation output of the ratio differential relay element of each of the three phases. The circuit breaker is tripped when the AND condition of at least one of the AND circuits is satisfied.
【００１２】[0012]
【作用】（１）請求項１の発明において、通常時は保護
対象変圧器に流入流出する電流の差はほぼ零であるの
で、比率差動継電要素は動作しない。(1) In the invention of claim 1, since the difference between the currents flowing into and out of the transformer to be protected is almost zero in the normal state, the ratio differential relay element does not operate.
【００１３】変圧器内部事故時は、差電流と抑制電流の
比が所定値以上になって当該事故相に設けられた比率差
動継電要素が動作する。このとき差電流に含まれる基本
波成分が多くなって、その３相分の合計値と第２高調波
成分の３相分の合計値との比が所定値以下となるので、
第２高調波抑制機能付３相過電流継電要素が動作して事
故相のアンド回路のアンド条件が成立する。このためし
ゃ断器がトリップされ、事故区間は速やかに切り離され
る。In the case of an internal failure of the transformer, the ratio of the differential current and the suppression current becomes a predetermined value or more, and the ratio differential relay element provided in the accident phase operates. At this time, the fundamental wave component contained in the difference current increases, and the ratio of the total value of the three phases and the total value of the three phases of the second harmonic component becomes less than or equal to a predetermined value.
The three-phase overcurrent relay element with the second harmonic suppression function operates to satisfy the AND condition of the AND circuit in the accident phase. For this reason, the circuit breaker is tripped, and the accident area is promptly disconnected.
【００１４】尚変圧器内部事故時に過渡的に一方の相で
第２高調波成分が多くなっても、第２高調波成分の３相
分の合計値はそれほど大きくならないので、該合計値と
基本波成分の３相分の合計値との比は所定値以下とな
る。このため第２高調波抑制機能付３相過電流継電要素
は確実に動作するので、前記過渡的な第２高調波成分に
よってしゃ断器のトリップがロックされることはない。Even if the second harmonic component transiently increases in one phase in the case of an internal fault of the transformer, the total value of the second harmonic component for three phases does not become so large. The ratio of the wave component to the total value of the three phases is less than or equal to a predetermined value. Therefore, the three-phase overcurrent relay element with the second harmonic suppression function operates reliably, so that the trip of the breaker is not locked by the transient second harmonic component.
【００１５】また内部事故のある変圧器を投入した時
も、当該事故相の差電流中の基本波成分が大きくなって
比率差動継電要素および第２高調波抑制機能付３相過電
流継電要素が動作し、事故相のアンド回路のアンド条件
が成立してしゃ断器がトリップされる。Further, even when a transformer having an internal accident is turned on, the fundamental wave component in the difference current of the accident phase becomes large and the ratio differential relay element and the three-phase overcurrent relay with the second harmonic suppression function. The electric element operates, and the AND condition of the AND circuit in the accident phase is established and the breaker is tripped.
【００１６】変圧器投入時は励磁突入電流が差電流とし
て流れる。この励磁突入電流中の第２高調波成分は、残
留磁気、投入位相の関係で一方の相で少なくても、他の
相に多く含まれるので、３相分の合計値はかなり大きく
なる。このため該合計値と基本波成分の３相分の合計値
との比は所定値以上となり、第２高調波抑制機能付３相
過電流継電要素は動作せず、各アンド回路のアンド条件
は不成立となる。したがって前記のように一方の相で第
２高調波成分が少ない場合であっても、励磁突入電流に
対して不要トリップ出力を出すことはない。When the transformer is turned on, the exciting inrush current flows as a difference current. The second harmonic component in the exciting inrush current is contained in a large amount in one phase even if it is small in one phase due to the relationship between the residual magnetism and the input phase, so that the total value of the three phases is considerably large. Therefore, the ratio of the total value and the total value of the three fundamental wave components is equal to or greater than a predetermined value, the three-phase overcurrent relay element with the second harmonic suppression function does not operate, and the AND condition of each AND circuit is not operated. Is not established. Therefore, even if the second harmonic component is small in one phase as described above, an unnecessary trip output is not output for the exciting inrush current.
【００１７】比率差動継電要素と第２高調波抑制機能付
３相過電流継電要素のアンド条件によりトリップ出力を
出しているので、両要素の時間協調の必要がなく、事故
除去時間が短縮される。Since the trip output is output depending on the AND condition of the ratio differential relay element and the three-phase overcurrent relay element with the second harmonic suppression function, there is no need for time coordination of both elements, and the fault clearance time is eliminated. Shortened.
【００１８】（２）請求項２の発明において、通常時は
保護対象変圧器に流入流出する電流の差はほぼ零である
ので、比率差動継電要素は動作しない。(2) In the invention of claim 2, since the difference between the currents flowing into and out of the transformer to be protected is almost zero in the normal state, the ratio differential relay element does not operate.
【００１９】変圧器内部事故時は、差電流と抑制電流の
比が所定値以上になって当該事故相に設けられた比率差
動継電要素が動作する。このとき基本波成分の３相各相
を２乗したものの合計値の平方根が大きくなるので、第
２高調波抑制機能付３相過電流継電要素が動作し、事故
相のアンド回路のアンド条件が成立する。このためしゃ
断器がトリップされ、事故区間は速やかに切り離され
る。In the event of an internal failure of the transformer, the ratio of the differential current to the suppression current exceeds a predetermined value, and the ratio differential relay element provided in the accident phase operates. At this time, the square root of the sum of squares of each of the three phases of the fundamental wave component becomes large, so the three-phase overcurrent relay element with the second harmonic suppression function operates, and the AND condition of the AND circuit of the accident phase Is established. For this reason, the circuit breaker is tripped, and the accident area is promptly disconnected.
【００２０】尚変圧器内部事故時に過渡的に一方の相で
第２高調波成分が多くなっても、基本波成分が大きいの
で、第２高調波成分の３相各相を２乗したものの合計値
の平方根と基本波成分の３相各相を２乗したものの合計
値の平方根との比は所定値以下となる。このため第２高
調波抑制機能付３相過電流継電要素が確実に動作するの
で、前記過渡的な第２高調波成分によってしゃ断器のト
リップがロックされることはない。Even if the second harmonic component transiently increases in one phase during an internal transformer accident, the fundamental component is large, so the sum of the squares of the three phases of the second harmonic component. The ratio between the square root of the value and the square root of the total value of the squares of the three phases of the fundamental wave component is less than or equal to a predetermined value. Therefore, since the three-phase overcurrent relay element with the second harmonic suppression function operates reliably, the trip of the breaker is not locked by the transient second harmonic component.
【００２１】また内部事故のある変圧器を投入した時
も、当該事故相の差電流中の基本波成分が大きくなって
比率差動継電要素および第２高調波抑制機能付３相過電
流継電要素が動作し、事故相のアンド回路のアンド条件
が成立してしゃ断器がトリップされる。この場合故障相
の入力の基本波分は２乗しない場合よりも大きくなるの
で、比率差動リレーのロックがより早く解除され、故障
除去時間が短縮される。Even when a transformer having an internal accident is turned on, the fundamental wave component in the difference current of the accident phase becomes large, and the ratio differential relay element and the three-phase overcurrent relay with the second harmonic suppression function. The electric element operates, and the AND condition of the AND circuit in the accident phase is established and the breaker is tripped. In this case, the fundamental wave component of the input of the failure phase becomes larger than that in the case where it is not squared, so that the lock of the ratio differential relay is released earlier and the failure removal time is shortened.
【００２２】変圧器投入時は励磁突入電流が差電流とし
て流れる。この励磁突入電流中の第２高調波成分は、残
留磁気、投入位相の関係で一方の相で少なくても、他の
相に多く含まれるので、３相各相を２乗したものの合計
値の平方根はかなり大きくなる。このため第２高調波抑
制機能付３相過電流継電要素は動作せず、各アンド回路
のアンド条件は不成立となる。したがって前記のように
一方の相で第２高調波成分が少ない場合であっても、励
磁突入電流に対して不要トリップ出力を出すことはな
い。When the transformer is turned on, the exciting inrush current flows as a difference current. The second harmonic component in the exciting inrush current is contained in a large amount in one phase even if it is small in one phase due to the relationship between the residual magnetism and the applied phase. Therefore, the sum of the squared values of the three phases is calculated. The square root will be quite large. Therefore, the three-phase overcurrent relay element with the second harmonic suppression function does not operate, and the AND condition of each AND circuit is not satisfied. Therefore, even if the second harmonic component is small in one phase as described above, an unnecessary trip output is not output for the exciting inrush current.
【００２３】比率差動継電要素と第２高調波抑制機能付
３相過電流継電要素のアンド条件によりトリップ出力を
出しているので、両要素の時間協調の必要がなく、事故
除去時間が短縮される。Since the trip output is output depending on the AND condition of the ratio differential relay element and the three-phase overcurrent relay element with the second harmonic suppression function, there is no need for time coordination of both elements, and the fault clearance time is eliminated. Shortened.
【００２４】積形の演算方式を採用している一般的なデ
ィジタルリレーでは、前記３相各入力の２乗値は直接求
められるので、前記第２高調波抑制機能付３相過電流継
電要素の演算時間は著しく短縮される。これによって保
護リレーとしての動作時間も早くなる。In a general digital relay adopting the product type operation method, the square value of each input of the three phases is directly obtained, so that the three-phase overcurrent relay element with the second harmonic suppression function is provided. The calculation time of is significantly reduced. As a result, the operation time as a protection relay is shortened.
【００２５】[0025]
【実施例】以下、図面を参照しながら請求項１に記載の
発明の実施例を説明する。図１において図４と同一部分
は同一符号を以て示し、その説明は省略する。図１にお
いて図４と異なる点は、第２高調波抑制機能付３相過電
流継電要素１７を設け、該継電要素１７の動作出力と前
記比率差動継電要素１，２，３の動作出力との論理積を
アンド回路１４，１５，１６で求め、アンド回路１４，
１５，１６の出力をオア回路１０に入力し、オア回路１
０の出力をしゃ断器トリップ出力としたことにある。比
率差動継電要素１，２，３の動作特性は図５（ａ）と同
一である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described below with reference to the drawings. 1, the same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. 1 is different from FIG. 4 in that a third-phase overcurrent relay element 17 with a second harmonic suppression function is provided, and the operation output of the relay element 17 and the ratio differential relay elements 1, 2, 3 An AND circuit 14, 15, 16 calculates the logical product with the operation output.
The outputs of 15 and 16 are input to the OR circuit 10, and the OR circuit 1
The output of 0 is the breaker trip output. The operating characteristics of the ratio differential relay elements 1, 2 and 3 are the same as those in FIG.
【００２６】前記第２高調波抑制機能付３相過電流継電
要素１７は次の条件式が成立したときに動作する。The three-phase overcurrent relay element 17 with the second harmonic suppression function operates when the following conditional expression is satisfied.
【００２７】[0027]
【数１】 [Equation 1]
【００２８】[0028]
【数２】 [Equation 2]
【００２９】前記（１）式のαを０．１５に設定したと
きの第２高調波抑制機能付３相過電流継電要素１７の特
性は図２のように示される。The characteristics of the three-phase overcurrent relay element 17 with the second harmonic suppression function when α in the equation (1) is set to 0.15 is shown in FIG.
【００３０】上記のように構成された装置において、変
圧器投入時に励磁突入電流が流れた場合、残留磁気、投
入位相の関係で、一方の相の第２高調波成分Ｉｆ2が小
さくても、他の相にはその分Ｉｆ2成分が多く含まれて
くる。このため前記（１）式のように３相の平均値を求
めればΣＩｆ2／ΣＩｆ1はほぼ平均してかなり高い値と
なり、第２高調波抑制機能付３相過電流継電要素１７は
動作しない。これによってアンド回路１４，１５，１６
の各アンド条件は不成立となりトリップ出力は出されな
い。このように前記（１）式のαの値を極端に小さくし
なくても励磁突入電流に対してはΣＩｆ2／ΣＩｆ1≦α
が成立せず、不要トリップ出力を出すことはない。In the device configured as described above, when an exciting inrush current flows when the transformer is turned on, even if the second harmonic component If 2 of one phase is small due to the relationship between the residual magnetism and the making phase, The other phase contains a large amount of If 2 component. Therefore, if the average value of the three phases is calculated as in the equation (1), ΣIf 2 / ΣIf 1 will be a substantially high value on average, and the three-phase overcurrent relay element 17 with the second harmonic suppression function will operate. do not do. By this, the AND circuits 14, 15, 16
Each AND condition of is not satisfied and the trip output is not output. As described above, ΣIf 2 / ΣIf 1 ≤α for the exciting inrush current even if the value of α in the equation (1) is not extremely reduced.
Is not established and unnecessary trip output is not output.
【００３１】また変圧器内部事故時は、当該事故相に設
けられた比率差動継電要素（１，２，３）が動作すると
ともに、差電流中の基本波成分Ｉｆ1が大きくなってΣ
Ｉｆ2／ΣＩｆ1≦αが成立し、第２高調波抑制機能付３
相過電流継電要素１７が動作する。このため事故相側の
アンド回路（１４，１５，１６）のアンド条件が成立し
てトリップ出力が出される。Further, at the time of an internal fault of the transformer, the ratio differential relay elements (1, 2, 3) provided in the fault phase operate and the fundamental wave component If 1 in the differential current becomes large.
If 2 / ΣIf 1 ≦ α is established, and the second harmonic suppression function is provided 3
The phase overcurrent relay element 17 operates. Therefore, the AND condition of the AND circuit (14, 15, 16) on the accident phase side is satisfied, and the trip output is output.
【００３２】さらに内部事故のある変圧器を投入した場
合も事故相のＩｆ1が大きくなりΣＩｆ2／ΣＩｆ1≦α
が成立し、前記同様にトリップ出力が出される。Furthermore, if a transformer with an internal accident is turned on, If 1 of the accident phase increases, and ΣIf 2 / ΣIf 1 ≤α
Is satisfied, and the trip output is output as described above.
【００３３】図１の装置では比率差動継電要素１，２，
３と第２高調波抑制機能付３相過電流継電要素１７の動
作のアンド条件成立によりトリップ出力を出しているの
で、過渡時も考慮して比率差動継電要素の動作時間を第
２高調波抑制機能付３相過電流継電要素の動作時間より
も長く設定する必要がなくなる。これによって総合的に
事故除去時間を短くすることができる。In the apparatus of FIG. 1, the ratio differential relay elements 1, 2,
3 and the trip output is generated when the AND condition of the operation of the three-phase overcurrent relay element 17 with the second harmonic suppression function is satisfied, the operation time of the ratio differential relay element is set to the second value in consideration of the transient time. It is not necessary to set it longer than the operating time of the three-phase overcurrent relay element with harmonic suppression function. This makes it possible to shorten the accident elimination time as a whole.
【００３４】次に請求項２に記載の発明の実施例を説明
する。図１の第２高調波抑制機能付３相過電流要素１７
をディジタルリレーで実現しようとするとき、ＣＰＵの
演算処理時間が若干長くなり、保護リレーとしての動作
時間を早くすることができない場合がある。Next, an embodiment of the invention described in claim 2 will be described. Three-phase overcurrent element 17 with second harmonic suppression function in FIG.
In order to realize the above with a digital relay, the arithmetic processing time of the CPU becomes slightly longer, and it may not be possible to shorten the operation time as a protection relay.
【００３５】ディジタルリレーの振幅値演算方式として
大きく分けると加算形と積形に分けられるが、加算形の
場合、サンプリング点数が多くなって演算時間が長くな
り、且つ精度が悪いという理由で、ディジタルリレーと
しては積形が広く用いられている。The method of calculating the amplitude value of a digital relay can be roughly divided into an addition type and a product type. However, in the addition type, the number of sampling points is large, the calculation time is long, and the accuracy is poor, so that the digital type is used. The product type is widely used as a relay.
【００３６】しかし積形の場合、交流入力の２乗値が直
接出ててくるので、これの平方根をとって交流入力を求
めるのにかなりの処理時間を必要とする。そこで本実施
例では図１の第２高調波抑制機能付３相過電流要素１７
の動作特性を図３に示すように設定し、前記（２）式と
下記（３）式の条件式が成立したときに動作するように
した。However, in the case of the product form, since the square value of the AC input directly comes out, it takes a considerable processing time to obtain the AC input by taking the square root of this. Therefore, in this embodiment, the three-phase overcurrent element 17 with the second harmonic suppression function of FIG. 1 is used.
The operating characteristics of No. 2 are set as shown in FIG. 3, and the operation is performed when the conditional expressions of the above-mentioned Expression (2) and the following Expression (3) are satisfied.
【００３７】[0037]
【数３】 [Equation 3]
【００３８】前記（３）式の両辺を２乗すれば次式に変
換される。If both sides of the equation (3) are squared, it is converted into the following equation.
【００３９】[0039]
【数４】 [Equation 4]
【００４０】積形の演算方式を採用している一般的なデ
ィジタルリレーでは前記（４）式の中の各相入力の２乗
値は直接求められるので、（４）式全体の演算時間は非
常に短くすることができる。これによって保護リレーと
しての動作時間も早くすることができる。In a general digital relay adopting the product type operation method, the squared value of each phase input in the equation (4) is directly obtained, so that the operation time of the entire equation (4) is extremely short. Can be shortened to As a result, the operation time as a protection relay can be shortened.
【００４１】上記のように構成された装置において、変
圧器投入時に励磁突入電流が流れた場合、残留磁気、投
入位相の関係で、一方の相の第２高調波成分Ｉｆ2が小
さくても、他の相にはその分Ｉｆ2成分が多く含まれて
くる。このため前記（３）式のように３相各相を２乗し
たものの合計値の平方根を求めればＩｆ2／Ｉｆ1はかな
り高い値となり、第２高調波抑制機能付３相過電流継電
要素１７は動作しない。これによってアンド回路１４，
１５，１６の各アンド条件は不成立となりトリップ出力
は出されない。このように前記（３）式のαの値を極端
に小さくしなくても、励磁突入電流に対して（３）式は
成立せず、不要トリップ出力を出すことはない。In the device configured as described above, when an exciting inrush current flows when the transformer is turned on, even if the second harmonic component If 2 of one phase is small due to the relationship between the residual magnetism and the making phase, The other phase contains a large amount of If 2 component. Therefore, if the square root of the sum of squared values of each of the three phases is calculated as in equation (3) above, If 2 / If 1 becomes a considerably high value, and the three-phase overcurrent relay with the second harmonic suppression function is obtained. Element 17 does not work. As a result, the AND circuit 14,
Since the AND conditions of 15 and 16 are not satisfied, the trip output is not output. As described above, even if the value of α in the equation (3) is not extremely reduced, the equation (3) does not hold for the exciting inrush current and the unnecessary trip output is not output.
【００４２】また変圧器内部事故時は、当該事故相に設
けられた比率差動継電要素（１，２，３）が動作すると
ともに、差電流中の基本波成分Ｉｆ1が大きくなって
（３）式が成立し、第２高調波抑制機能付３相過電流継
電要素１７が動作する。このため事故相側のアンド回路
（１４，１５，１６）のアンド条件が成立してトリップ
出力が出される。When an internal fault occurs in the transformer, the ratio differential relay elements (1, 2, 3) provided in the fault phase operate and the fundamental wave component If 1 in the differential current becomes large ( Formula 3) is established and the three-phase overcurrent relay element 17 with the second harmonic suppression function operates. Therefore, the AND condition of the AND circuit (14, 15, 16) on the accident phase side is satisfied, and the trip output is output.
【００４３】さらに内部事故のある変圧器を投入した場
合も事故相のＩｆ1が大きくなって（３）式が成立し、
前記同様にトリップ出力が出される。Further, when a transformer with an internal accident is turned on, If 1 of the accident phase increases and the equation (3) holds,
The trip output is output as described above.
【００４４】[0044]
【発明の効果】以上のように請求項１、２に記載の発明
によれば、前記（１），（２）式又は（３）式の条件成
立時に動作する第２高調波抑制機能付３相過電流継電要
素の動作出力と、比率差動継電要素の動作出力とのアン
ドをとってトリップ出力を出すように構成したので、次
のような優れた効果が得られる。As described above, according to the first and second aspects of the present invention, the third harmonic wave suppression function 3 which operates when the condition of the formula (1), (2) or (3) is satisfied is provided. Since the trip output is obtained by ANDing the operation output of the phase overcurrent relay element and the operation output of the ratio differential relay element, the following excellent effects can be obtained.
【００４５】（１）第２高調波成分による抑制率を極端
に高めなくても励磁突入電流による不要出力が出ないの
で、第２高調波抑制機能付３相過電流継電要素の動作設
定値αを大きく設定することができる。このため変圧器
内部事故時の過渡的な第２高調波分電流Ｉｆ2によって
ロックされたり、比率差動継電要素のトリップ出力が遅
れることはない。このため事故除去時間が短くなる。(1) Since the unnecessary output due to the excitation inrush current does not occur even if the suppression rate due to the second harmonic component is not extremely increased, the operation set value of the three-phase overcurrent relay element with the second harmonic suppression function α can be set large. Therefore, the transient second harmonic component current If 2 at the time of an internal accident of the transformer is not locked, and the trip output of the ratio differential relay element is not delayed. Therefore, the time required for clearing the accident is shortened.
【００４６】（２）比率差動継電要素と第２高調波抑制
機能付３相過電流継電要素のアンドによりトリップ出力
を出しているので両継電要素間の時間協調をとる必要が
なく、事故除去時間を短くすることができる。(2) Since trip output is output by ANDing the ratio differential relay element and the three-phase overcurrent relay element with the second harmonic suppression function, there is no need to coordinate the two relay elements in time. , The accident removal time can be shortened.
【００４７】（３）前記（１），（２）項に記載の効果
があるにもかかわらず、内部事故のある変圧器を投入し
た場合にもトリップロックがかかることがない。(3) Despite the effects described in the above items (1) and (2), trip lock is not applied even when a transformer having an internal accident is turned on.
【００４８】（４）ＣＰＵの演算処理時間を短くするこ
とができ、保護リレーの動作時間を早くでき、故障除去
時間を短くすることができる。逆に同じ動作時間であれ
ば同一ＣＰＵで処理できるリレー要素の数を多くするこ
とができ、経済的な効果も大きい。(4) The calculation processing time of the CPU can be shortened, the operation time of the protection relay can be shortened, and the failure elimination time can be shortened. On the contrary, if the operation time is the same, the number of relay elements that can be processed by the same CPU can be increased, and the economical effect is large.
【００４９】さらに請求項２に記載の発明によれば各相
入力を２乗しているので、次のような効果が得られる。Further, according to the invention described in claim 2, since each phase input is squared, the following effects can be obtained.
【００５０】（１）変圧器励磁突入電流で、ある相で第
２高調波分が極端に小さくても他の相で第２高調波分が
大きいと、その大きい相の分が、２乗しない場合よりも
大きく影響してくるので、励磁突入時のロックがより確
実となる。(1) In transformer inrush current, if the second harmonic component is extremely small in a certain phase but the second harmonic component is large in another phase, the large phase component is not squared. Since it has a greater influence than in the case, the lock at the time of magnetizing inrush becomes more reliable.
【００５１】（２）すでに内部故障のある変圧器を投入
した場合、故障相の基本波成分が大きくなり、２乗しな
い場合に比べて基本波分の和が大きくなり、比率差動リ
レーのロックがより早く解除され、故障除去時間が短く
なる。(2) When a transformer already having an internal fault is turned on, the fundamental wave component of the faulty phase becomes large, and the sum of the fundamental waves becomes large as compared with the case where it is not squared, and the ratio differential relay locks. Will be released sooner and the fault clearing time will be shorter.
【図１】本発明の一実施例を示す回路図。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図２】請求項１の発明を適用した第２高調波抑制機能
付３相過電流継電要素の動作特性図。FIG. 2 is an operation characteristic diagram of a three-phase overcurrent relay element with a second harmonic suppression function to which the invention of claim 1 is applied.
【図３】請求項２の発明を適用した第２高調波抑制機能
付３相過電流継電要素の動作特性図。FIG. 3 is an operational characteristic diagram of a three-phase overcurrent relay element with a second harmonic suppression function to which the invention of claim 2 is applied.
【図４】従来の変圧器保護継電装置の一例を示す回路
図。FIG. 4 is a circuit diagram showing an example of a conventional transformer protection relay device.
【図５】図４の各要素の動作特性を示し、図５（ａ）は
比率差動継電要素の動作特性図、図５（ｂ）は第２高調
波ロック要素の動作特性図。5A and 5B show operating characteristics of each element of FIG. 4, FIG. 5A is an operating characteristic diagram of a ratio differential relay element, and FIG. 5B is an operating characteristic diagram of a second harmonic locking element.
１，２，３…比率差動継電要素 ７，８，９…第２高調波ロック要素 １０…オア回路 １４，１５，１６…アンド回路 １７…第２高調波抑制機能付３相過電流継電要素 1, 2, 3 ... Ratio differential relay element 7, 8, 9 ... Second harmonic locking element 10 ... OR circuit 14, 15, 16 ... AND circuit 17 ... Three-phase overcurrent relay with second harmonic suppression function Electric element
Claims (2)
電流と抑制電流の比が所定値以上のときに動作する比率
差動継電要素を有し、該比率差動継電要素の動作出力に
よって、前記変圧器に接続されたしゃ断器をトリップし
て保護を行う変圧器保護継電装置において、 保護対象変圧器が接続される３相各相に各々設けられ、
前記差電流と抑制電流の比が所定値以上のときに動作す
る比率差動継電要素と、 前記差電流中の基本波成分の３相分の合計値と、前記差
電流中の第２高調波成分の３相分の合計値との比が所定
値以下であり、且つ前記基本波成分の３相分の合計値が
設定電流値以上であるときに動作する第２高調波抑制機
能付３相過電流継電要素と、 前記第２高調波抑制機能付３相過電流継電要素の動作出
力と、前記３相各相の比率差動継電要素の動作出力との
論理積を各々求めるアンド回路とを備え、 前記各アンド回路のうち少なくともいずれか１個のアン
ド回路のアンド条件が成立したときに前記しゃ断器をト
リップすることを特徴とする変圧器保護継電装置。1. A ratio differential relay element, which operates when a ratio of a difference current between currents flowing into and out of a protection target transformer and a suppression current is a predetermined value or more, and the operation of the ratio differential relay element. In a transformer protection relay device that trips and protects a circuit breaker connected to the transformer according to the output, each of the three phases to which the transformer to be protected is connected is provided,
A ratio differential relay element that operates when the ratio of the difference current to the suppression current is a predetermined value or more, a total value of three phases of the fundamental wave component in the difference current, and a second harmonic in the difference current. Second harmonic suppression function 3 which operates when the ratio of the wave component to the total value of the three phases is less than a predetermined value and the total value of the fundamental wave component of the three phases is equal to or more than the set current value The logical product of the phase overcurrent relay element, the operation output of the three-phase overcurrent relay element with the second harmonic suppression function, and the operation output of the ratio differential relay element of each of the three phases is obtained. An AND circuit, wherein the breaker is tripped when the AND condition of at least one of the AND circuits is satisfied.
電流と抑制電流の比が所定値以上のときに動作する比率
差動継電要素を有し、該比率差動継電要素の動作出力に
よって、前記変圧器に接続されたしゃ断器をトリップし
て保護を行う変圧器保護継電装置において、 保護対象変圧器が接続される３相各相に各々設けられ、
前記差電流と抑制電流の比が所定値以上のときに動作す
る比率差動継電要素と、 前記差電流中の基本波成分であって、３相各相を２乗し
たものの合計値の平方根と、前記差電流中の第２高調波
成分であって、３相各相を２乗したものの合計値の平方
根との比が所定値以下であり、且つ前記基本波成分の３
相分の合計値が設定電流値以上であるときに動作する第
２高調波抑制機能付３相過電流継電要素と、 前記第２高調波抑制機能付３相過電流継電要素の動作出
力と、前記３相各相の比率差動継電要素の動作出力との
論理積を各々求めるアンド回路とを備え、 前記各アンド回路のうち少なくともいずれか１個のアン
ド回路のアンド条件が成立したときに前記しゃ断器をト
リップすることを特徴とする変圧器保護継電装置。2. A ratio differential relay element that operates when a ratio of a difference current of currents flowing into and out of a protection target transformer and a suppression current is equal to or greater than a predetermined value, and the operation of the ratio differential relay element. In a transformer protection relay device that trips and protects a circuit breaker connected to the transformer according to the output, each of the three phases to which the transformer to be protected is connected is provided,
A ratio differential relay element that operates when the ratio of the difference current to the suppression current is a predetermined value or more, and the square root of the sum of squared three-phase phases of the fundamental wave component in the difference current. And the ratio of the second harmonic component in the difference current, which is the square root of the sum of the squares of each of the three phases, to a predetermined value or less, and 3 of the fundamental wave component.
A three-phase overcurrent relay element with a second harmonic suppression function that operates when the total value of the phases is greater than or equal to a set current value, and an operation output of the three-phase overcurrent relay element with a second harmonic suppression function And an AND circuit that respectively obtains a logical product with the operation output of the ratio differential relay element of each of the three phases, and the AND condition of at least one of the AND circuits is satisfied. A transformer protection relay device, which trips the breaker at times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26678093A JP3269220B2 (en) | 1993-04-28 | 1993-10-26 | Transformer protection relay |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-102078 | 1993-04-28 | ||
| JP10207893 | 1993-04-28 | ||
| JP26678093A JP3269220B2 (en) | 1993-04-28 | 1993-10-26 | Transformer protection relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0715863A true JPH0715863A (en) | 1995-01-17 |
| JP3269220B2 JP3269220B2 (en) | 2002-03-25 |
Family
ID=26442819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26678093A Expired - Lifetime JP3269220B2 (en) | 1993-04-28 | 1993-10-26 | Transformer protection relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3269220B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452601C (en) * | 2006-08-17 | 2009-01-14 | 江苏省电力试验研究院有限公司 | New magneting inrush current recognition method adapted for large-scale power transformer additional with phase discrimination |
| CN102035178A (en) * | 2010-12-29 | 2011-04-27 | 许继集团有限公司 | Method for transformer excitation surge current latching |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101774245B1 (en) | 2013-02-18 | 2017-09-19 | 엘에스산전 주식회사 | Root-mean square detector and circuit breaker thereof |
-
1993
- 1993-10-26 JP JP26678093A patent/JP3269220B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452601C (en) * | 2006-08-17 | 2009-01-14 | 江苏省电力试验研究院有限公司 | New magneting inrush current recognition method adapted for large-scale power transformer additional with phase discrimination |
| CN102035178A (en) * | 2010-12-29 | 2011-04-27 | 许继集团有限公司 | Method for transformer excitation surge current latching |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3269220B2 (en) | 2002-03-25 |
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