JP2777266B2 - Ratio differential relay - Google Patents
Ratio differential relayInfo
- Publication number
- JP2777266B2 JP2777266B2 JP2132687A JP13268790A JP2777266B2 JP 2777266 B2 JP2777266 B2 JP 2777266B2 JP 2132687 A JP2132687 A JP 2132687A JP 13268790 A JP13268790 A JP 13268790A JP 2777266 B2 JP2777266 B2 JP 2777266B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- difference
- ratio
- detection
- phase difference
- 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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- Protection Of Transformers (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、電力系統における変圧器の内部短絡事故の
検出などに用いる比率差動継電装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a ratio differential relay device used for detecting an internal short-circuit accident of a transformer in an electric power system.
（従来の技術） 従来、電力系統における変圧器の内部短絡事故を検出
して回路を保護する装置として、第９図に示すような比
率差動保護継電装置が用いられている。(Prior Art) Conventionally, a ratio differential protection relay device as shown in FIG. 9 has been used as a device for detecting an internal short circuit accident of a transformer in a power system and protecting the circuit.
この比率差動保護継電装置は、変圧器１の一次側に計
器用変流器２と遮断器３を設けると共に、二次側に計器
用変流器４と遮断器５を設け、両側の計器用変流器2,4
の電流出力を比率差動継電器６に接続した構成となって
おり、変圧器１の内部短絡事故などによって計器用変流
器２および４に流れる電流I1およびI2間の不平衡率が設
定値以上になると比率差動継電器６が作動し、遮断器３
および５を遮断させて回路の保護を行う。In this ratio differential protection relay, an instrument current transformer 2 and a circuit breaker 3 are provided on a primary side of a transformer 1, and an instrument current transformer 4 and a circuit breaker 5 are provided on a secondary side. Instrument current transformers 2,4
It has a configuration in which connecting current outputs of the ratio differential relay 6, imbalance ratio between the currents I 1 and I 2 flowing in the current transformer 2 and 4 meter, such as by an internal short circuit of the transformer 1 is set When the value exceeds the value, the ratio differential relay 6 operates and the circuit breaker 3
And 5 are cut off to protect the circuit.
（発明が解決しようとする課題） しかしながら、このような従来の比率差動保護継電装
置では変圧器１の一次、二次変圧比および計器用変流器
2,4の変流比に基づく比率差動継電器６への入力電流比
を補正する整合係数の設定誤りや、計器用変流器2,4の
接続誤りなどによる誤動作を防止するために、実負荷運
転状態で比率差動継電器６の入力電流特性試験を行う必
要がある。(Problems to be Solved by the Invention) However, in such a conventional ratio differential protection relay device, the primary and secondary transformer ratios of the transformer 1 and the current transformer for the instrument are used.
In order to prevent a malfunction due to a setting error of a matching coefficient for correcting an input current ratio to the differential relay 6 or an incorrect connection of the current transformers 2 and 4 based on the current transformation ratios of 2 and 4, It is necessary to perform an input current characteristic test of the ratio differential relay 6 in a load operation state.
この入力電流特性試験では第10図に示すように計器用
変流器2,4の電流回路に計測器7,8を接続し、電流I1,I2
の電流値や位相を計測して比率差動継電器６の動作特性
を人為的に比較判断しており、この特性試験に誤りがあ
ると通常運転中における比率差動継電器６の入力電流の
差電流、位相差の異常を判別することができず、保護動
作ができないという問題を生ずる。In this input current characteristic test, as shown in FIG. 10, measuring instruments 7 and 8 were connected to the current circuits of the current transformers 2 and 4, and the currents I 1 and I 2
The current value and phase of the ratio differential relay 6 are measured and the operation characteristics of the ratio differential relay 6 are artificially compared and judged. If there is an error in this characteristic test, the difference current of the input current of the ratio differential relay 6 during normal operation is determined. In addition, there is a problem that the abnormality of the phase difference cannot be determined and the protection operation cannot be performed.
本発明は、このような従来の問題を考慮してなされた
もので、外部に計測器を接続することなく直接的に比率
差動継電器の入力電流状態を表示すると共に、比率差動
継電装置の動作特性に対して入力電流の状態が異常であ
ることをいち早く検出して警報できる比率差動継電装置
を提供することを目的としている。The present invention has been made in consideration of such a conventional problem, and directly displays the input current state of the ratio differential relay without connecting an external measuring instrument, and further includes a ratio differential relay device. It is an object of the present invention to provide a ratio differential relay device capable of quickly detecting that the state of the input current is abnormal with respect to the operation characteristics of the above, and issuing an alarm.
（課題を解決するための手段と作用） 上記目的を達成するために、本発明は、電力系統に配
設された変圧器の内部事故を検出する比率差動継電装置
において、予め設定した整合係数を乗算して補正された
上記変圧器の一次二次電流間の差電流比率を求め、この
差電流比率が設定値以上になったとき動作する差電流比
率検出手段と、上記補正された一次二次電流間の差を求
め、この差電流が設定値以上になったとき動作する差電
流検出手段と、上記一次二次電流比と上記整合係数との
間の不平衡率を求め、この不平衡率が設定値以上になっ
たとき動作する不平衡率検出手段と、上記一次二次電流
間の位相差を求め、この位相差が設定値以上になったと
き動作する位相検出手段と、前記各検出手段の少なくと
も一つが、設定時間以上検出動作したことを条件に、上
記検出動作した検出手段を含む複数の検出手段の検出値
をそれぞれ表示する表示手段を備えたことを特徴とする
比率差動継電装置であり、入力電流に整合係数を乗じた
補正後の入力電流に対して従来と同様に、差電流の大き
さが設定値以上であり、かつ、補正後の入力電流の差電
流比率も設定値以上である場合に比率差動継電装置の動
作信号を出力すると共に、入力電流の比と整合係数との
間の不平衡率を求めてこの値を表示すると共に、不平衡
率が一定値以上となったときに入力電流の異常として警
報を出力し、また入力電流の位相差を検出すると共にこ
の位相差を表示し、この位相差が一定値以上となったと
きに入力電流の異常として警報を出力し、さらに差電流
検出、差電流比率検出、不平衡率検出、位相差検出が行
われたときには入力電流比、差電流値、差電流比率、入
力電流と整合係数間の不平衡率、入力電流位相の検出値
を記憶して表示するものである。(Means and Actions for Solving the Problems) In order to achieve the above object, the present invention relates to a ratio differential relay device for detecting an internal fault of a transformer arranged in an electric power system. A difference current ratio between the primary and secondary currents of the transformer corrected by multiplying by a coefficient, and a difference current ratio detection means that operates when the difference current ratio is equal to or greater than a set value; The difference between the secondary currents is determined, and the difference current detection means that operates when the difference current is equal to or greater than a set value, and the unbalance ratio between the primary secondary current ratio and the matching coefficient are determined. An unbalance rate detecting means that operates when the balance rate is equal to or more than a set value, a phase difference between the primary and secondary currents is obtained, and the phase detection means that operates when the phase difference is equal to or more than a set value; At least one of the detection means has performed the detection operation for the set time or more. A ratio differential relay device characterized by comprising display means for respectively displaying detection values of a plurality of detection means including the detection means which has performed the detection operation, wherein the ratio is obtained by multiplying an input current by a matching coefficient. In the same manner as in the past, the ratio of the differential current when the magnitude of the difference current is equal to or greater than the set value and the difference current ratio of the corrected input current is equal to or greater than the set value. Outputs the operation signal of the device, calculates the unbalance rate between the ratio of the input current and the matching coefficient, and displays this value. Outputs an alarm, detects the phase difference of the input current and displays this phase difference, and when this phase difference exceeds a certain value, outputs an alarm as an abnormality of the input current. Current ratio detection, unbalance rate detection, phase difference detection Input current ratio when it is, the difference between the current value, the difference current rate, the input current unbalanced ratio between matching coefficients, is to store and display the detected value of the input current phase.
（実施例） 本発明の一実施例を第１図に示す。(Embodiment) An embodiment of the present invention is shown in FIG.
第１図において、入力電流I1,I2は入力絶縁変換器９
およびアナログ／ディジタル変換器10を介してそれぞれ
ディジタル量の電流値Id1,Id2および位相角φ1,φ２に
変換され、変換された電流値Id1,Id2および位相角φ1,
φ２が入力データとしてシステムバスを介して各検出要
素に送られる。In FIG. 1, the input currents I 1 and I 2 are
And the current values I d1 and I d2 and the phase angles φ 1 and φ 2 of the digital quantities via the analog / digital converter 10, respectively, and the converted current values I d1 and I d2 and the phase angles φ 1 and φ 1 ,
phi 2 is sent via the system bus as input data to each detection element.
差電流検出要素11では入力電流I1に対応する電流値I
d1と位相角データφ１および入力電流I2に対応する電流
値データId2と位相角データφ２、さらに予じめ設定デ
ータ要素15に設定されている整合係数Ｋおよび差電流動
作値SETΔＩとをシステムバスから取り出すと共に、例
えば下式に従って差電流値ΔＩを算出し、両者を比較し
て異常判定を行う。In the difference current detecting element 11, the current value I corresponding to the input current I 1
d1 and current value data I d2 and phase angle data phi 2 corresponding to the phase angle data phi 1 and the input current I 2, and further matching coefficient K and the difference current operating values are set to pre Ji order setting data element 15 SETderutaI Is taken out from the system bus, the difference current value ΔI is calculated according to, for example, the following equation, and the two are compared to determine an abnormality.
差電流ΔＩのベクトル図の一例を第２図に示す。 FIG. 2 shows an example of a vector diagram of the difference current ΔI.
差電流比率検出要素12では上記の変換データId1,Id2,
φ1,φ２、および予じめ設定データ要素15に設定されて
いる差電流比率動作値SETΔＩ（％）をシステムバスか
ら取り出すと共に、例えば下式に従って差電流比率ΔＩ
（％）を算出し、両者を比較して異常判定を行う。In the difference current ratio detecting element 12, the conversion data I d1 , I d2 ,
φ 1 , φ 2 , and the difference current ratio operation value SETΔI (%) set in the preset setting data element 15 are taken out from the system bus, and the difference current ratio ΔI is calculated according to the following equation, for example.
(%) Is calculated, and an abnormality is determined by comparing the two.
さらに不平衡率ERR（％）検出要素13では上記変換デ
ータId1,Id2と予じめ入力設定データ要素15設定されて
いる整合係数Ｋと不平衡率動作値SETEER（％）をシステ
ムバスから取り出すと共に、例えば下式に従って不平衡
率ERR（％）を算出し、両者を比較して異常判定を行
う。 Further, in the unbalance rate ERR (%) detection element 13, the conversion data I d1 and I d2 and the matching coefficient K and the unbalance rate operation value SETEER (%) set in advance in the input setting data element 15 are transmitted from the system bus. At the same time, the unbalance rate ERR (%) is calculated according to, for example, the following equation, and the two are compared to determine an abnormality.
また入力電流位相差検出要素14では上記の変換データ
φ1,φ２と予じめ設定データ要素15に設定されている位
相差異常動作値SETφとをシステムバスから取り出すと
共に、例えば下式に従って位相差φを算出し、両者を比
較して位相差異常判定を行う。 The input current phase difference detecting element 14 extracts the above-mentioned conversion data φ 1 , φ 2 and the phase difference abnormal operation value SETφ set in the preset setting data element 15 from the system bus, and obtains the position according to the following equation, for example. The phase difference φ is calculated, and the two are compared to determine a phase difference abnormality.
位相差φ＝｜φ２−φ1| 位相差異常判定｜φ−π｜≧SETφのとき異常。Phase difference φ = | φ 2 −φ 1 | Phase difference abnormality judgment Abnormal when | φ−π | ≧ SETφ.
正常時の入力電流I1,I2は逆極性電流（π＝180゜の位
相差）であり、第３図のベクトル図に示すようになる。The normal input currents I 1 and I 2 are reverse polarity currents (phase difference of π = 180 °), as shown in the vector diagram of FIG.
第３図のベクトル図において検出される位相差φは、 φ＝φ２−φ１＝180゜（＝π） であり、位相差異常判定はφ−π＝０となり、 ｜φ−π｜≧SETφ が不成立となって異常判定されない。The phase difference φ detected in the vector diagram of FIG. 3 is φ = φ 2 −φ 1 = 180 ° (= π), the phase difference abnormality determination is φ−π = 0, and | φ−π | ≧ SETφ is not satisfied and no abnormality is determined.
また計器用変流器二次の接続誤りなどのために入力電
流相が違っていたり、CT二次の電流極性が違っていた場
合の一例を第４図および第５図に示し、この場合の位相
差異常動作値SETφを例えば５゜としている。FIGS. 4 and 5 show examples of the case where the input current phase is different due to an error in connection of the secondary of the current transformer for the instrument or the current polarity of the CT secondary is different. The abnormal phase difference operation value SETφ is, for example, 5 °.
第４図は、Ｒ相電流入力をすべきところI2にＴ相電流
を入力した場合のベクトル図であり、 位相差φ＝φ２−φ１＝240゜ 位相差異常判定では｜φ−π｜≧SETφ ｜φ−π｜＝|240゜−180゜｜＝60゜＞SETφ＝５゜ となり位相差異常が検出される。Figure 4 is a vector diagram in the case of inputting the R-phase current inputs the T phase current I 2 when it should be, is a decision phase difference φ = φ 2 -φ 1 = 240 ° phase difference abnormality | phi-[pi | ≧ SETφ | φ−π | = | 240 ° −180 ° | = 60 °> SETφ = 5 ° and an abnormal phase difference is detected.
第５図は同相入力ではあるがCT二次の電流極性が違っ
ている場合のベクトル図であり、 位相差φ＝φ２−φ１＝０ 位相差異常判定では｜φ−π｜≧SETφ ｜φ−π｜＝|0゜−180゜｜＝180゜＞SETφ＝５゜ となり、位相差異常が検出される。FIG. 5 is a vector diagram in the case of the same-phase input but different CT secondary current polarities. Phase difference φ = φ 2 −φ 1 = 0 | φ-π | ≧ SETφ | φ−π | = | 0 ° −180 ° | = 180 °> SETφ = 5 °, and the phase difference abnormality is detected.
さらに出力処理要素17では上記差電流検要素11、差電
流比率検出要素12、不平衡率検出要素13、および入力電
流位相差検出要素14のそれぞれの処理で検出された各動
作信号を読み込み、出力インタフェース18を介して出力
し、比率差動継電装置の動作信号の出力処理を一定周期
で実行する。Further, the output processing element 17 reads and outputs each operation signal detected in the processing of each of the difference current detection element 11, the difference current ratio detection element 12, the unbalance rate detection element 13, and the input current phase difference detection element 14. Output is performed via the interface 18, and output processing of the operation signal of the ratio differential relay device is executed at a constant cycle.
すなわち例えば第６図のフローチャートに示すよう
に、先ず差電流検出要素11からの差電流動作判定信号と
差電流比率検出要素12からの差電流比率動作判定信号の
読み込み処理S1を実行する。That is, as shown in, for example, the flowchart of FIG. 6, first, a reading process S1 of a difference current operation determination signal from the difference current detection element 11 and a difference current ratio operation determination signal from the difference current ratio detection element 12 is executed.
次に読み込み処理S1の結果、上記差電流動判定信号と
差電流比率動作判定信号が共に動作しているか否かの判
定処理S2を実行し、共に動作している場合は比率差動継
電装置の動作信号の出力処理S3を実行して出力インタフ
ェース18を介して外部へ出力すると共に、そうでない場
合には動作出力処理を終了する。Next, as a result of the reading process S1, a determination process S2 is performed to determine whether or not the difference current motion determination signal and the difference current ratio operation determination signal are operating together. The output processing S3 of the operation signal is executed and output to the outside via the output interface 18, and if not, the operation output processing ends.
さらに動作出力処理実行の次に、上記差電流検出要素
11、差電流比率検出要素12、不平衡率検出要素13、およ
び入力電流位相差検出要素14からの各データΔI,ΔＩ
％、ERR％、およびφをそれぞれ記憶テーブルに格納
し、表示処理要素16を介して表示処理S4を実行し、動作
出力処理を終了する。Further, after execution of the operation output processing, the difference current detection element
11, data ΔI, ΔI from the difference current ratio detection element 12, the unbalance rate detection element 13, and the input current phase difference detection element 14.
%, ERR%, and φ are respectively stored in the storage table, the display processing S4 is executed via the display processing element 16, and the operation output processing ends.
出力処理要素17はさらに、例えば第７図に示すような
入力電流異常検出処理も一定周期で実行する。The output processing element 17 also executes, for example, an input current abnormality detection process as shown in FIG.
すなわち、先ず上記の差電流検出要素11、差電流比率
検出要素12、不平衡率検出要素13、および入力電流位相
差検出要素14からの各動作判定信号の読み込み処理S11
を実行する。That is, first, the reading process S11 of each operation determination signal from the above-described difference current detection element 11, difference current ratio detection element 12, unbalance rate detection element 13, and input current phase difference detection element 14
Execute
次に読み込み処理S11で読み込んだ各動作判定信号す
なわち差電流動作判定信号、差電流比率動作判定信号、
不平衡率動作判定信号および位相差動作判定信号のいず
れかが動作しているか否かの判定処理S12を実行し、上
記各動作判定信号が何れも動作していない場合は入力電
流異常検出処理を終了し、上記各動作判定信号の少くと
も１つが動作している場合は動作継続時間のカウント処
理S13を実行し、次に所定時間以上継続したか否かの判
定処理S14を実行する。Next, each operation determination signal read in the reading process S11, that is, a difference current operation determination signal, a difference current ratio operation determination signal,
Execute the determination process S12 of whether any of the unbalance rate operation determination signal and the phase difference operation determination signal is operating, and if none of the above operation determination signals are operating, perform the input current abnormality detection process When at least one of the above-mentioned operation determination signals is operating, an operation continuation time counting process S13 is performed, and then a determination process S14 of whether or not the operation has continued for a predetermined time is performed.
所定時間継続判定処理14で所定時間以上継続していな
いと判定された場合は処理を終了し、所定時間以上継続
したと判定された場合は入力電流異常警報信号の出力処
理S15を実行し、出力インタフェース18を介して外部へ
入力電流異常警報を出力する。If it is determined in the predetermined time continuation determination processing 14 that the processing has not continued for the predetermined time or more, the processing is terminated.If it is determined that the processing has continued for the predetermined time or more, the input current abnormality alarm signal output processing S15 is executed, and the output is performed. An input current abnormality alarm is output to the outside via the interface 18.
さらに上記差電流検出要素11、差電流比率検出要素1
2、不平衡率検出要素13、および入力電流位相差検出要
素14からの各検出データΔI,ΔＩ％、ERR％、およびφ
を記憶テーブルに格納し、表示処理要素16を介して、格
納データの表示処理S16を実行し、これによって入力電
流異常検出処理を終了する。Further, the difference current detecting element 11, the difference current ratio detecting element 1
2. Each detection data ΔI, ΔI%, ERR%, and φ from the unbalance rate detecting element 13 and the input current phase difference detecting element 14.
Is stored in the storage table, and the stored data display processing S16 is executed via the display processing element 16, thereby ending the input current abnormality detection processing.
また第１図に示す設定要素15へデータ表示要求信号を
入力することによって、その時の入力電流状況に応じた
各検出データΔI,ΔＩ％、ERR％およびφを随時表示す
ることも可能である。By inputting a data display request signal to the setting element 15 shown in FIG. 1, it is also possible to display the detected data .DELTA.I, .DELTA.I%, ERR% and .phi. According to the input current condition at that time.
さらに入力電流に含有される高調成分の検出やフィル
タ処理なども従来と同様に付加することが可能である。Further, detection of a harmonic component contained in the input current, filtering, and the like can be added as in the conventional case.
次に上記の構成による比率差動継電装置の動作につい
て説明する。Next, the operation of the ratio differential relay device having the above configuration will be described.
この比率差動継電装置19は、第８図に示すように、変
圧器１の一次側に計器用変流器２と遮断器３を設けると
共に二次側に計器用変流器４と遮断器５を設け、計器用
変流器2,4の出力電流が互に180゜の位相差をもった入力
電流I1,I2となるように接続して使用される。As shown in FIG. 8, this ratio differential relay device 19 is provided with an instrument current transformer 2 and a circuit breaker 3 on the primary side of a transformer 1 and cuts off the instrument current transformer 4 on the secondary side. The current transformers 2 and 4 are connected so that the output currents of the current transformers 2 and 4 become input currents I 1 and I 2 having a phase difference of 180 ° from each other.
上記の構成を用いることによって、変圧器１の内部短
絡事故などによって過大な電流が流れると、計器用変流
器2,4からの電流I1,I2の間に大きな不平衡が生じ、この
不平衡電流の入力によって比率差動継電装置19が作動し
て遮断器2,5に対してトリップ信号を出力する。By using the above configuration, when an excessive current flows due to an internal short-circuit accident of the transformer 1 or the like, a large imbalance occurs between the currents I 1 and I 2 from the current transformers 2 and 4 for the instrument. The input of the unbalanced current activates the ratio differential relay 19 to output a trip signal to the circuit breakers 2 and 5.
この場合、正常状態においては入力電流I1とI2は逆位
相であり、アナログ／ディジタル変換要素10でそれぞれ
Id1,Id2に変換された後、Id1が整合係数Ｋで補正されて
Id1・Ｋ＝Id2となり差電流値ΔＩは前述のように下式で
求められる。In this case, in the normal state, the input currents I 1 and I 2 are in opposite phases, and the analog / digital conversion elements 10 respectively
After being converted to I d1 and I d2 , I d1 is corrected by the matching coefficient K and
I d1 · K = I d2 , and the difference current value ΔI is obtained by the following equation as described above.
ここでφ２−φ１＝180゜（π）、Id1・Ｋ＝Id2であ
り、Id1・Ｋ＝Id2＝ａとすると となり、また差電流比率もΔＩ％＝０となる。 Here, φ 2 −φ 1 = 180 ゜ (π), I d1 · K = I d2 , and I d1 · K = I d2 = a And the difference current ratio is also ΔI% = 0.
また不平衡率ERR％も、Id1・Ｋ＝Id2であることから となる。The unbalance rate ERR% is also Id1 · K = Id2. Becomes
さらに、入力電流位相差φは、φ＝φ２−φ１＝180
゜であり、位相差異常判定では｜φ−π｜＝０゜とな
る。Further, the input current phase difference φ is φ = φ 2 −φ 1 = 180
で は, and | φ−π | = 0} in the phase difference abnormality determination.
上述のように計器用変流器2,4の一次側の接続が正常
で、かつ変圧器１の変圧比と計器用変流器2,4の変流比
による入力電流比が、整合係数Ｋによって適正に補正さ
れていれば、ΔI,ΔＩ％,ERR％，φのいずれも不動作で
ある。As described above, the primary-side connection of the current transformers 2 and 4 is normal, and the input current ratio based on the transformer ratio of the transformer 1 and the current transformer ratio of the current transformers 2 and 4 is equal to the matching coefficient K. If they are properly corrected by, all of ΔI, ΔI%, ERR%, and φ do not operate.
一方計器用変流器の接続誤りなどがあって入力電流が
逆位相極性となったり、他相の電流が取り込まれたりし
た場合には、上記の判定式から分るように位相差と入力
電流の大きさに応じた差電流ΔＩと、位相差に応じた差
電流比率ΔＩ％が検出され、さらに位相差分の位相差異
常角が検出される。On the other hand, if the input current has an opposite phase polarity due to an incorrect connection of the current transformer for the instrument or the current of another phase is taken in, the phase difference and the input current , A difference current ratio ΔI% according to the phase difference, and an abnormal phase difference angle of the phase difference are detected.
また、整合係数Ｋが適正な値に設定されていないとき
は、差電流ΔI,差電流比率ΔＩ％および不平衡率ERR％
が検出される。従って不平衡率ERR％の検出設定値SETER
R（％）と位相差異常検出設定値SETφの値を可能な限り
小さく設定することにより比較的軽い負荷で系統が運用
中であれば比率差動継電装置が誤って動作する前に上記
の誤りに起因する異常状態を発見できると共に、比率差
動継電装置自体の特性試験も容易に行うことができる。When the matching coefficient K is not set to an appropriate value, the difference current ΔI, the difference current ratio ΔI%, and the unbalance rate ERR%
Is detected. Therefore, the unbalance rate ERR% detection set value SETER
By setting the value of R (%) and the phase difference abnormality detection set value SETφ as small as possible, if the system is operating with a relatively light load, the above-mentioned ratio differential relay device will An abnormal state due to an error can be found, and a characteristic test of the ratio differential relay device itself can be easily performed.
以上説明したように本発明による比率差動継電装置
は、入力電流に対する差電流および差電流比率の検出手
段とその表示手段、入力電流比と整合係数の不平衡率の
検出手段とその表示手段、および位相差検出手段とその
表示手段を備えているので、特性試験のために別途計測
器を接続する必要がなく、変圧器運転中の比率差動保護
継電装置の入力電流特性を表示手段の表示を通して常時
監視することができ、これによって計器変流器自体の不
良または入力電流線路断線や短絡などによる電流入力の
異常を検出することが可能となり、さらにシステムの改
造や変更などで結線誤りを生じた場合にもその異常状態
を容易に検出することが可能となる。As described above, the ratio differential relay device according to the present invention includes: a difference current with respect to an input current; a difference current ratio detection means and a display means thereof; an input current ratio and a matching coefficient unbalance rate detection means and a display means thereof , And phase difference detection means and display means thereof, so that there is no need to connect a separate measuring instrument for the characteristic test, and the input current characteristics of the ratio differential protection relay during the operation of the transformer are displayed. Can be monitored at any time through the display, which makes it possible to detect faults in the current transformer itself or abnormalities in the current input due to disconnection or short circuit of the input current line. , The abnormal state can be easily detected.
第１図は本発明による比率差動継電装置の一実施例を示
す構成図、第２図〜第５図はそれぞれ本発明の動作を説
明するためのベクトル図、第６図および第７図はそれぞ
れ本発明の動作処理を示すフローチャート、第８図は本
発明を変圧器の保護継電装置として用いた場合の系統
図、第９図および第10図はそれぞれ従来の比率差動継電
器を変圧器の保護に用いた場合の系統図および試験回路
図である。 １……変圧器、2,4……計器用変流器 3,5……遮断器、６……比率差動継電器 7,8……計測器、９……入力絶縁変換器 10……アナログ／ディジタル変換器 11……差電流検出要素 12……差電流比率検出要素 13……不平衡率検出要素、14……位相差検出要素 15……設定処理要素、16……表示処理要素 17……出力処理要素 18……出力インタフェース 19……比率差動継電装置FIG. 1 is a block diagram showing one embodiment of a ratio differential relay device according to the present invention, and FIGS. 2 to 5 are vector diagrams for explaining the operation of the present invention, respectively, and FIGS. Is a flow chart showing the operation process of the present invention, FIG. 8 is a system diagram when the present invention is used as a protection relay device of a transformer, and FIGS. 9 and 10 each show a conventional ratio differential relay. FIG. 3 is a system diagram and a test circuit diagram when used for protection of a container. 1… Transformer, 2,4… Current transformer for instrument 3,5… Circuit breaker, 6… Ratio differential relay 7,8… Measurement instrument, 9 …… Input isolation converter 10 …… Analog / Digital converter 11… Difference current detection element 12… Difference current ratio detection element 13… Unbalance rate detection element 14… Phase difference detection element 15… Setting processing element 16… Display processing element 17… … Output processing element 18… Output interface 19… Ratio differential relay
Claims (1)
検出する比率差動継電装置において、予め設定した整合
係数を乗算して補正された上記変圧器の一次二次電流間
の差電流比率を求め、この差電流比率が設定値以上にな
ったとき動作する差電流比率検出手段と、上記補正され
た一次二次電流間の差を求め、この差電流が設定値以上
になったとき動作する差電流検出手段と、上記一次二次
電流比と上記整合係数との間の不平衡率を求め、この不
平衡率が設定値以上になったとき動作する不平衡率検出
手段と、上記一次二次電流間の位相差を求め、この位相
差が設定値以上になったとき動作する位相検出手段と、
前記各検出手段の少なくとも一つが、設定時間以上検出
動作したことを条件に、上記検出動作した検出手段を含
む複数の検出手段の検出値をそれぞれ表示する表示手段
を備えたことを特徴する比率差動継電装置。1. A ratio differential relay for detecting an internal fault in a transformer disposed in an electric power system, wherein the primary and secondary currents of the transformer are corrected by multiplying by a preset matching coefficient. The difference current ratio is obtained, and the difference between the difference current ratio detection means that operates when the difference current ratio becomes equal to or more than the set value and the corrected primary and secondary currents is obtained, and the difference current becomes equal to or more than the set value. Differential current detection means that operates when the unbalance rate between the primary and secondary current ratio and the matching coefficient is determined, and the unbalance rate detection means that operates when the unbalance rate is equal to or greater than a set value. Determining a phase difference between the primary and secondary currents, and a phase detection unit that operates when the phase difference is equal to or greater than a set value;
A ratio difference comprising: a display unit for displaying detection values of a plurality of detection units including the detection unit that has performed the detection operation, on condition that at least one of the detection units has performed the detection operation for a set time or more. Motion relay device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2132687A JP2777266B2 (en) | 1990-05-24 | 1990-05-24 | Ratio differential relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2132687A JP2777266B2 (en) | 1990-05-24 | 1990-05-24 | Ratio differential relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0429516A JPH0429516A (en) | 1992-01-31 |
| JP2777266B2 true JP2777266B2 (en) | 1998-07-16 |
Family
ID=15087184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2132687A Expired - Fee Related JP2777266B2 (en) | 1990-05-24 | 1990-05-24 | Ratio differential relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2777266B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413640B (en) * | 2020-04-03 | 2022-04-19 | 国网甘肃省电力公司建设分公司 | Differential protection wiring detection method and device of high-impedance transformer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63186525A (en) * | 1987-01-28 | 1988-08-02 | 株式会社東芝 | Digital differential relay |
| JPH01174219A (en) * | 1987-12-28 | 1989-07-10 | Toshiba Corp | Ratio-differential protective-relay |
-
1990
- 1990-05-24 JP JP2132687A patent/JP2777266B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0429516A (en) | 1992-01-31 |
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