JPH0764236B2 - Relay for detecting changes in DC electricity - Google Patents
Relay for detecting changes in DC electricityInfo
- Publication number
- JPH0764236B2 JPH0764236B2 JP60267161A JP26716185A JPH0764236B2 JP H0764236 B2 JPH0764236 B2 JP H0764236B2 JP 60267161 A JP60267161 A JP 60267161A JP 26716185 A JP26716185 A JP 26716185A JP H0764236 B2 JPH0764236 B2 JP H0764236B2
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- current
- value
- comparator
- circuit
- output
- 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
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Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は、電鉄用直流き電線の保護など直流電力回路の
保護に関し、特に負荷電流と事故電流が単にその絶対値
のみでは判定できない様な直流き電回路の保護に関す
る。Description: FIELD OF THE INVENTION The present invention relates to protection of DC power circuits such as protection of DC feeders for electric railways, and in particular to DC where load current and fault current cannot be determined only by their absolute values. Regarding the protection of feeder circuits.
一般に電鉄用直流き電回路においては、第３図に示すよ
うに、き電セクシヨン19によつて区分された１つのき電
区間に対して、各変電所の直流母線18から、直流高速度
遮断器１を介して給電することにより、き電線の保護を
行つている。１つのき電区間の中で複数の電車20がレー
ル21上を同時に運行している状態で、変電所近くで電車
が起動すると、変電所のき電回路を流れる電流ｉは第４
図（ａ）のように変化する。一方、電車負荷がないとき
に変電所から遠く離れた地点で短絡故障が発生すると、
第４図（ｂ）のような電流が流れ、故障電流ifがピーク
運転電流irmより小さい場合があり、従来の高速度遮断
器１だけでは保護できない。Generally, in the DC feeding circuit for electric railways, as shown in FIG. 3, for one feeding section divided by the feeding section 19, the DC high speed cutoff is made from the DC bus 18 of each substation. By feeding power through the device 1, the feeder is protected. When multiple trains 20 are simultaneously operating on the rail 21 in one feeder section and the trains are started near the substation, the current i flowing in the feeder circuit of the substation is the fourth.
It changes as shown in FIG. On the other hand, if there is a short circuit fault at a point far away from the substation when there is no train load,
Figure 4 current flows, such as in (b), however, the fault current i f is sometimes peak operating current i rm smaller, it can not be protected only conventional high-speed circuit breaker 1.
しかし、第４図に示すように運転電流は電車のノツチ制
御等により小刻みに電流が増加Δi1，Δi2するが、故障
電流23は一度に電流が増加し、電流増加量Δｉは故障電
流の方が一般的に大きいという関係がある。従つて、電
流増加量Δｉの大きさを抽出し、これが所定値を越えた
ことにより故障電流と判断することにより、絶対値がピ
ーク運転電流より小さな故障電流についても、故障と負
荷を選択できることになる。However, as shown in FIG. 4, the operating current increases in small increments Δi 1 and Δi 2 due to the notch control of the train, but the fault current 23 increases at a time, and the current increase amount Δi is the fault current. There is a relationship that is generally larger. Therefore, by extracting the magnitude of the current increase amount Δi and judging that it is a fault current when it exceeds a predetermined value, it is possible to select a fault and a load even for a fault current whose absolute value is smaller than the peak operating current. Become.
従来は、この機能を第５図に示すような装置により実現
していた。以下第６図の各部信号波形と共にその動作を
説明する。き電線27に故障電流ｉが流れると、磁路の一
部にギヤツプを有する一次貫通形の不飽和変成器24の２
次側には、故障電流ｉの微分波形に相当する電圧v1が発
生する。電圧v1は、抵抗25a,25bとコンデンサ25cにより
構成される一次遅れ積分回路25に入力され、出力として
電圧v2を発生する。電圧v2は比較器11に印加され、整定
値電圧26より大きくなると比較器11は、出力電圧v3を出
力する。出力電圧v3は単安定マルチバイブレータ13を駆
動し、単安定マルチバイブレータの出力v4により電磁リ
レー14を動作させ、この電磁リレー14の接点により、高
速度遮断器１をトリツプさせている。Conventionally, this function has been realized by a device as shown in FIG. The operation will be described below with reference to the signal waveforms of the respective parts in FIG. When a fault current i flows through the feeder 27, 2 of the primary through-type unsaturated transformer 24 having a gear tap in a part of the magnetic path.
On the next side, a voltage v 1 corresponding to the differential waveform of the fault current i is generated. The voltage v 1 is input to the first-order delay integration circuit 25 composed of the resistors 25a and 25b and the capacitor 25c, and the voltage v 2 is generated as an output. The voltage v 2 is applied to the comparator 11, and when it becomes larger than the set value voltage 26, the comparator 11 outputs the output voltage v 3 . The output voltage v 3 drives the monostable multivibrator 13, the output v 4 of the monostable multivibrator causes the electromagnetic relay 14 to operate, and the contacts of the electromagnetic relay 14 cause the high speed circuit breaker 1 to trip.
この装置では、１つのき電区間内で、２台の電車が時間
的に極めて接近して起動すると、起動電流と故障電流と
を区別することができず、誤動作する欠点があつた。こ
れは一次遅れ積分回路25のコンデンサ25cは、起動する
電車の負荷電流によるギヤツプ付変流器24の２次側出力
電圧v1により充電される。通常、充電電荷は抵抗25bに
より徐々に放電する。しかし、２台の電車20の起動が時
間的に極めて接近して行なわれると、最初の電車の起動
時に充電されたコンデンサ25cの電荷が放電しきらない
うちに、後発電車の起動電流による充電がなされるた
め、結果的に２台分の電車の起動電流を一度に検出した
のと同じ結果となつて、誤動作してしまうことになる。
尚、電気鉄道用き電区分回路としては特開昭60−33134
号公報を挙げることができる。In this device, when two electric trains start up very close in time within one feeding section, the starting current and the fault current cannot be distinguished, and there is a drawback that a malfunction occurs. This is because the capacitor 25c of the first-order delay integration circuit 25 is charged by the secondary side output voltage v 1 of the current transformer 24 with a gear due to the load current of the train to be activated. Normally, the charge is gradually discharged by the resistor 25b. However, if the two trains 20 are started very closely in time, the charge by the starting current of the rear power generation car will be charged before the electric charge of the capacitor 25c charged at the start of the first train is completely discharged. As a result, the starting currents of two trains are detected at the same time, resulting in a malfunction.
Incidentally, as a feeder division circuit for electric railways, it is disclosed in JP-A-60-33134.
The gazette can be mentioned.
本発明の目的は、誤動作を防止した直流電気量の変化分
検出継電器を提供することにある。An object of the present invention is to provide a relay for detecting a change in the amount of direct current electricity that prevents malfunction.
本発明の直流電気量の変化分検出継電器は、直流回路に
流れる負荷電流を検出するサンプラと、ランプラの検出
値をデジタル値に変換するA/D変換器と、A/D変換器の出
力値を電流変化分として出力する減算器と、減算器の出
力信号と負荷起動電流値と比較し、負荷起動電流値より
大きい値のみ出力する比較器と、比較器からの出力信号
により電流変化分が増加している時に積算し、電流変化
分が減少，停帯した時にカウンタを零値とする積算カウ
ンタと、積算カウンタの出力信号が事故電流を示す時に
リレーを作動し、しや断器をしや断する比較器と、から
構成することにより、上述の目的を達成することにあ
る。The change detection relay of the DC electricity quantity of the present invention is a sampler for detecting the load current flowing in the DC circuit, an A / D converter for converting the detected value of the lampra into a digital value, and an output value of the A / D converter. Is output as the current change amount, the output signal of the subtractor is compared with the load starting current value, and the output signal from the comparator outputs only the value larger than the load starting current value. Integrates when the current is increasing, decreases the current, and sets the counter to zero when the current stops, and when the output signal of the integrating counter indicates a fault current, activates the relay to break or break the circuit. It is to achieve the above-mentioned object by being configured with a comparator that disconnects.
以下、本発明の実施例を第１図に示す電鉄用直流き電保
護回路により説明する。An embodiment of the present invention will be described below with reference to a DC feeder protection circuit for electric railway shown in FIG.
分流器２は直流き電線１に流れるき電電流に比例した電
圧を発生し、電圧は絶縁増幅器３により高圧直流回路と
絶縁された電圧としてサンプラ４に入力された後に、A/
D変換器５によりデイジタル信号に変換される。一連の
デイジタル信号は遅延レジスタ６と減算器７により単位
時間内の電流変化分が計算される。単位時間内電流変化
分は比較器８により基準変化分メモリ９の内容と比較さ
れる。基準変化分メモリ９は電車の起動電流により大き
い値つまり故障電流、事故電流時のみ比較器８により出
力するが、それより小さい時に比較器８の出力がオンと
なる様に構成されている。比較器８の出力がオンの時に
は、これが積算カウンタ10の零リセツト端子Ｒを駆動す
るので、積算カウンタ10の値は、零をとり続ける。The shunt 2 generates a voltage proportional to the feeding current flowing through the DC feeder 1, and the voltage is input to the sampler 4 as a voltage insulated from the high-voltage DC circuit by the insulation amplifier 3 and then the A /
It is converted into a digital signal by the D converter 5. A delay register 6 and a subtracter 7 calculate a current change amount in a unit time of a series of digital signals. The current change amount per unit time is compared with the contents of the reference change amount memory 9 by the comparator 8. The reference change memory 9 outputs the electric current to the starting current of the train by the comparator 8 only when it has a larger value, that is, a fault current or an accident current. When the output of the comparator 8 is on, it drives the zero reset terminal R of the integrating counter 10, so that the value of the integrating counter 10 continues to be zero.
これに対して、直流き電線27の電流が急激に増加を始め
ると、これに伴つて減算器７の出力であるサンプルタイ
ム内の変化分の大きさが基準変化分メモリ９の内容より
大きくなる。すると比較器８の出力がオフとなつて、積
算カウンタ10の零リセツト端子Ｒが駆動されなくなるた
め、積算カウンタ10の変化分が増加を続ける間にサンプ
ルタイム内の変化分を積算してゆく。積算カウンタ10の
積算値は比較器11により整定値メモリ12の内容と比較さ
れ、その値より大きい時に比較器11の出力がオンとな
る。この出力は単安定マルチバイブレータ13により一定
時間引き延ばされ、電磁リレー14を駆動し高速度しや断
器１にトリツプ指令を出力して、高速度しや断器１をし
や断する。また、電流変化分メモリが減少又は停滞し、
基準変化分メモリ９の設定値以下になれば、積算零リセ
ツト端子Ｒは駆動されて、積算カウンタ10の値は零をと
り続ける。On the other hand, when the current of the DC feeder 27 suddenly starts to increase, the magnitude of the change in the sample time, which is the output of the subtractor 7, becomes larger than the content of the reference change memory 9 accordingly. . Then, the output of the comparator 8 is turned off, and the zero reset terminal R of the integrating counter 10 is no longer driven. Therefore, while the changing amount of the integrating counter 10 continues to increase, the changing amount within the sample time is integrated. The integrated value of the integration counter 10 is compared with the contents of the set value memory 12 by the comparator 11, and when it is larger than that value, the output of the comparator 11 is turned on. This output is extended by the monostable multivibrator 13 for a certain period of time to drive the electromagnetic relay 14 to increase the speed and output a trip command to the breaker 1 to increase the speed or break the breaker 1. In addition, the current change memory decreases or stagnates,
When the value becomes equal to or less than the set value of the reference change amount memory 9, the integrated zero reset terminal R is driven and the value of the integrated counter 10 continues to take zero.
この結果、１台目の電車の起動時の起動電流が積算カウ
ンタ10で積算を開始しても、起動電流を整定値メモリ12
の値に達する前に減少するので、積算カウンタ10が零リ
セツトされると共に、起動電流が減少している途中で、
２台目の電車が起動されれば、再び積算カウンタ10は積
算を開始するが、整定値メモリ12の値に達する前に減少
し、積算カウンタ10をリセツトされる。つまり、２つ以
上の起動電流は重畳することがなく、トリツプ指令は出
力されないが、事故電流・故障電流等の電流変化分は大
きく、整定値メモリ12の値を越えて、トリツプ指令を出
力して、高速度しや断器１をしや断する。したがつて、
２編成以上の電車が時間的に接近して起動しても、電車
の起動電流と事故電流とが誤動作することなく、判別で
き、直流き電線を保護することができると共に、電車を
支障なく運行できる。As a result, even if the start-up current at the time of starting the first train is integrated by the integration counter 10, the start-up current is set to the set value memory 12
Since it decreases before reaching the value of, the integration counter 10 is reset to zero and the starting current is decreasing,
When the second train is activated, the integrating counter 10 starts integrating again, but it decreases before reaching the value in the set value memory 12, and the integrating counter 10 is reset. In other words, two or more start-up currents do not overlap and the trip command is not output, but the current change amount such as the accident current / fault current is large, and the trip command is output when the set value memory 12 value is exceeded. Then, the breaker 1 is cut off at a high speed. Therefore,
Even when trains of two or more trains come close to each other in time, the starting current and accident current of the trains can be distinguished without malfunctioning, the DC feeder can be protected, and the train can be operated without trouble. it can.
次に、本発明の他の実施例を第２図により説明する。Next, another embodiment of the present invention will be described with reference to FIG.
電流検出器16はき電電流に比例した電圧を発生し、この
電圧は主回路と絶縁されており、サンプラ４によりサン
プリングされた後、A/D変換器５によりデイジタル信号
に変換される。一連のデイジタル信号は遅延レジスタ６
と減算器７によりサンプルタイム内の変化分が計算され
る。この変化分は比較器８により基準変化分メモリ９の
内容と比較され、それより小さい時に比較器８の出力が
オンとなる様に構成されている。比較器８の出力がオン
の時はオンデイレータイマ17の入力端子Ｃが駆動され、
規定クロツク回数遅れて出力端子Ｕもオンとなる。この
出力は積算カウンタ10の零リセツト端子Ｒを駆動するの
で、積算カウンタ10の値は零をとり続ける。The current detector 16 generates a voltage proportional to the feeding current, which is insulated from the main circuit, is sampled by the sampler 4, and then converted into a digital signal by the A / D converter 5. The series of digital signals is the delay register 6
And the subtractor 7 calculates the amount of change within the sample time. This change amount is compared with the contents of the reference change amount memory 9 by the comparator 8, and when the change amount is smaller than that, the output of the comparator 8 is turned on. When the output of the comparator 8 is on, the input terminal C of the on-delay timer 17 is driven,
The output terminal U is turned on after the specified number of clock delays. Since this output drives the zero reset terminal R of the integrating counter 10, the value of the integrating counter 10 continues to be zero.
一方、直流き電線27の電流が急激に増加を始めると、こ
れに伴つて減算器７の出力であるサンプルタイム内の変
化分の大きさが基準変化分メモリ９の内容より大きくな
る。すると比較器８の出力がオフとなつて、オンデイレ
ータイマ17の入力がオフとなるので、出力もすぐにオフ
となり、以後第１図と同様な動作を行い、直流き電線を
保護することができる。On the other hand, when the current of the DC feeder 27 suddenly starts to increase, the magnitude of the change in the sample time, which is the output of the subtractor 7, becomes larger than the content of the reference change memory 9 accordingly. Then, the output of the comparator 8 is turned off and the input of the on-delay timer 17 is turned off. Therefore, the output is also turned off immediately, and thereafter the same operation as in FIG. 1 is performed to protect the DC feeder. You can
尚、本発明では、電鉄用直流き電線の保護に適用した場
合について述べたが、本発明は直流回路の電流変化を検
出・計測する場合たとえば圧延機の制御回路にも適用す
ることが出来る。Although the present invention has been described in the case of being applied to the protection of the DC feeder for electric railway, the present invention can be applied to the case of detecting and measuring the current change of the DC circuit, for example, the control circuit of the rolling mill.
以上のように本発明の直流電気量の変化分検出継電器に
よれば、２以上の起動電流が重畳することなく、起動電
流と故障電流とを判別できるようになり、誤動作を防止
できるので、直流回路を保護することができる。As described above, according to the change detection relay of the change in the amount of direct current electricity of the present invention, it becomes possible to distinguish the starting current and the fault current without superimposing two or more starting currents, and it is possible to prevent malfunctions. The circuit can be protected.
第１図，第２図は本発明の実施例である電鉄用直流き電
線の変化分検出継電器の保護回路、第３図は電鉄用き電
区間の回路図、第４図（ａ），（ｂ）は電鉄用直流き電
回路に流れる電車の運転電流と故障電流とを示す電流波
形図、第５図は従来の電鉄用直流き電線の変化分検出継
電器の保護回路、第６図は第５図の回路の動作を説明す
るための信号波形図である。 １……高速度しや断器、４……サンプラ、５……A/D変
換器、７……減算器、8,11……比較器、９……基準変化
分メモリ、10……積算カウンタ、12……整定値メモリ。1 and 2 are protection circuits for a variation detecting relay of a DC feeder for electric railway which is an embodiment of the present invention, FIG. 3 is a circuit diagram of a feeder section for electric railway, and FIGS. b) is a current waveform diagram showing an operating current and a fault current of a train flowing in a DC feeding circuit for electric railway, FIG. 5 is a protection circuit for a change detecting relay of a conventional DC feeding line for electric railway, and FIG. 5 is a signal waveform diagram for explaining the operation of the circuit of FIG. 1 ... High speed breaker, 4 ... sampler, 5 ... A / D converter, 7 ... subtractor, 8,11 ... comparator, 9 ... reference change memory, 10 ... integration Counter, 12 ... Set value memory.
Claims (1)
し、事故電流を検出してリレーを動作させて、しゃ断器
をしゃ断するものにおいて、直流回路に流れる電流を検
出するサンプラと、サンプラの検出値をデジタル値に変
換するA/D変換器と、A/D変換器の出力値を電流変化分と
して出力する減算器と、減算器の出力信号と負荷起動電
流値とを比較し、負荷起動電流値より大きい値のみ出力
する比較器と、比較器からの出力信号により電流変化分
が増加している時に積算し、かつ電流変化分が減少、停
滞した時に積算値を零値にする積算カウンタと、積算カ
ウンタの出力信号が起動電流か事故電流かを比較し、事
故電流の時のみ出力する比較器と、から成ることを特徴
とする直流電気量の変化分検出継電器。1. A sampler, which installs a circuit breaker in a DC circuit to which a load is connected, detects a fault current and activates a relay to interrupt the circuit breaker, and a sampler which detects a current flowing in the DC circuit. A / D converter that converts the detected value of to a digital value, a subtractor that outputs the output value of the A / D converter as a current change amount, and compare the output signal of the subtractor and the load starting current value, A comparator that outputs only a value that is larger than the load start-up current value, and integrates when the current change is increasing due to the output signal from the comparator, and sets the integrated value to zero when the current change decreases or stagnates. A relay for detecting a change in the amount of direct current electricity, comprising: an integrating counter and a comparator that compares the output signal of the integrating counter with a starting current or a fault current and outputs only when the fault current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60267161A JPH0764236B2 (en) | 1985-11-29 | 1985-11-29 | Relay for detecting changes in DC electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60267161A JPH0764236B2 (en) | 1985-11-29 | 1985-11-29 | Relay for detecting changes in DC electricity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62128838A JPS62128838A (en) | 1987-06-11 |
| JPH0764236B2 true JPH0764236B2 (en) | 1995-07-12 |
Family
ID=17440940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60267161A Expired - Lifetime JPH0764236B2 (en) | 1985-11-29 | 1985-11-29 | Relay for detecting changes in DC electricity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0764236B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2637097B2 (en) * | 1987-05-21 | 1997-08-06 | 株式会社東芝 | DC current change detection relay |
| RU2695043C1 (en) * | 2018-05-07 | 2019-07-18 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" | Method of instant automatic reclosure for feeders of dc contact network at traction substations and sectioning stations |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6174836U (en) * | 1984-10-22 | 1986-05-20 |
-
1985
- 1985-11-29 JP JP60267161A patent/JPH0764236B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62128838A (en) | 1987-06-11 |
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