JPS605731A - Internal shortcircuit protecting device of transformer - Google Patents
Internal shortcircuit protecting device of transformerInfo
- Publication number
- JPS605731A JPS605731A JP11461983A JP11461983A JPS605731A JP S605731 A JPS605731 A JP S605731A JP 11461983 A JP11461983 A JP 11461983A JP 11461983 A JP11461983 A JP 11461983A JP S605731 A JPS605731 A JP S605731A
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- current
- tap
- internal short
- differential relay
- 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.)
- Pending
Links
Landscapes
- Protection Of Transformers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明はタップ切換可能な変圧器の内部が短絡した場合
の保護装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection device in the event of an internal short circuit in a tap-changeable transformer.
変圧器の内部短絡保護装置は、第1図に示すように、電
力供給線1と負荷線2との間に遮断器3.4を介して接
続されたタップ切換可能な変圧器5の一次側と二次側と
に夫々接続された変流器6.7と、この夫々の変流器6
.7により得られた電流を入力され、変圧器5の内部が
短絡すると一次側と二次側を流れる電流により遮断器3
を開放して変圧器5の焼損を防止する比率差動継電器8
とにより構成されるのが一般的である。The internal short-circuit protection device of the transformer is provided on the primary side of the tap-changeable transformer 5 connected between the power supply line 1 and the load line 2 via a circuit breaker 3.4, as shown in FIG. and a current transformer 6.7 connected to the secondary side and the current transformer 6.
.. 7 is input, and when the inside of the transformer 5 is short-circuited, the current flowing through the primary and secondary sides causes the circuit breaker 3 to
A ratio differential relay 8 that opens the transformer 5 to prevent burnout of the transformer 5.
Generally, it consists of:
ところが、変圧器5の電圧タップ切換を行うと、上記構
成では比率差動継電器8の動作点が変るので、これを防
止するには比率差動継電器8に電流タップ切換機構を備
えさせるか、又は変流器6 (電圧タップが一次側にあ
る場合)又は7(電圧タップが二次側にある場合)を電
圧タップ切換に応じて取り替えなければならなかった。However, when the voltage tap of the transformer 5 is switched, the operating point of the ratio differential relay 8 changes in the above configuration, so in order to prevent this, the ratio differential relay 8 must be equipped with a current tap switching mechanism, or Current transformer 6 (if the voltage tap is on the primary side) or 7 (if the voltage tap is on the secondary side) had to be replaced depending on the voltage tap change.
本発明は上記の点に鑑み為されたもので、タップ切換可
能な変圧器の一次側と二次側を流れる夫々の電流を、夫
々変流器を介して比率差動継電器に入力し、前記変圧器
の内部短絡による比率差動継電器の動作により該変圧器
への電力供給を遮断するようにした変圧器の内部短絡保
護装置において、前記変圧器のタップ切換側に配設され
た変流器に、変流比切換手段を設ける構成とすることに
より、特殊な構成の比率差動継電器を用いることなく、
更にわざわざ変流器を交換することなく、上記不都合を
解消した変圧器の内部短絡保護装置を提供するものであ
る。The present invention has been made in view of the above points, and the currents flowing through the primary and secondary sides of a tap-switchable transformer are respectively input to a ratio differential relay via a current transformer. In the internal short-circuit protection device for a transformer, which cuts off power supply to the transformer by operating a ratio differential relay due to an internal short-circuit in the transformer, the current transformer is disposed on the tap switching side of the transformer. By providing a current transformation ratio switching means, it is possible to eliminate the need for a ratio differential relay with a special configuration.
Furthermore, it is an object of the present invention to provide an internal short-circuit protection device for a transformer that eliminates the above-mentioned disadvantages without having to take the trouble to replace the current transformer.
以下本発明の一実施例を第F図を参照しつつ第2図と第
3図に基づいて説明する。An embodiment of the present invention will be described below with reference to FIGS. 2 and 3 while referring to FIG. F.
A、B、Cは変圧器5の一相分の一次側巻線11の中途
の複数個所から日出線を出して形成された電圧タップ、
12は変圧器5の電圧タップA−Cを選択する選択スイ
ッチ、13は変流器6の二次側巻線、142〜14Cは
二次側巻線13の中途の複数個所即ち変圧器5のタップ
数と同数の個所から日出線を出して形成された電流タッ
プ、A′、B′、Cは変圧器5の電圧タップA、B、C
,を選択スイッチ12により選択すると連動して閉成す
るリミットスイッチで、A′は電圧タップAに、B′は
電圧タップBに、C′は電圧タップCに夫々対応する。A, B, and C are voltage taps formed by extending Hiji wires from multiple locations in the middle of the primary winding 11 for one phase of the transformer 5;
12 is a selection switch for selecting voltage taps A to C of the transformer 5; 13 is a secondary winding of the current transformer 6; 142 to 14C are multiple points in the middle of the secondary winding 13, that is, the selection switch of the transformer 5; Current taps A', B', and C are formed by extending the Hiji wires from the same number of points as the number of taps, and A', B', and C are voltage taps A, B, and C of the transformer 5.
, are limit switches that are closed in conjunction with selection by the selection switch 12, and A' corresponds to voltage tap A, B' corresponds to voltage tap B, and C' corresponds to voltage tap C, respectively.
尚、電流タップ14a〜14C並びにリミットスイッチ
A′、B′、C′は変圧器5の電圧タップ切換側に配設
された変流器6の変流比を変圧器5の電圧タップ切換に
連動して切換える変流比切換手段として機能する。Note that the current taps 14a to 14C and limit switches A', B', and C' link the current transformation ratio of the current transformer 6 disposed on the voltage tap switching side of the transformer 5 to the voltage tap switching of the transformer 5. It functions as a current conversion ratio switching means.
次に作用を説明する。Next, the effect will be explained.
変圧器5の一次側に設けられた電圧タップA、B、Cを
適宜切換えると、例えば電圧タップAとすると、この切
換動作に連動してリミットスイッチA′が閉成し、変流
器6の二次側が電流タップ14cに切換わる。従って、
変圧器5の一次側電圧タッブAへの切換により、変圧器
5の巻数比が変化して変圧器5の一次側並びに二次側の
電流が変化しようとも、−次側に配設された変流器6の
選択された変流比が切換ねった前記巻数比のほぼ逆数値
となるように変流器6の二次側の電流タップ位置を設定
しであるので、比率差動継電器8の動作点を電圧タップ
切換前とほぼ同一とすることができる。これにより、変
圧器5の一次側電圧タツブを任意の位置に切換しても、
変圧器5の内部が短絡すれば、従来の如く変流器を交換
或いは電流タップ切換機構を備えた特殊な比率差動継電
器を用いることなく、確実に比率差動継電器8により遮
断器3を開放でき、変圧器5の焼損事故を防止できる。When voltage taps A, B, and C provided on the primary side of the transformer 5 are switched appropriately, for example, when voltage tap A is selected, limit switch A' is closed in conjunction with this switching operation, and the current transformer 6 is switched. The secondary side is switched to the current tap 14c. Therefore,
By switching to the primary side voltage tab A of the transformer 5, even if the turns ratio of the transformer 5 changes and the currents on the primary and secondary sides of the transformer 5 change, the voltage of the transformer disposed on the negative side changes. Since the current tap position on the secondary side of the current transformer 6 is set so that the selected current transformation ratio of the current transformer 6 is approximately the reciprocal of the turned ratio, the ratio of the ratio differential relay 8 is set. The operating point can be made almost the same as before the voltage tap switching. As a result, even if the primary side voltage tab of the transformer 5 is switched to any position,
If there is a short circuit inside the transformer 5, the circuit breaker 3 can be reliably opened by the ratio differential relay 8 without replacing the current transformer or using a special ratio differential relay equipped with a current tap switching mechanism as in the past. Therefore, burnout accidents of the transformer 5 can be prevented.
尚、上記実施例ではりミントスイッチA′、〜C′によ
り変圧器5の電圧タップ切換に連動して変流器6の変流
比を自動的に切換えるようにしたが、リミットスイッチ
以外のスイッチング手段でもよいし、又は、手動により
切換える構成でもよい。In the above embodiment, the current transformation ratio of the current transformer 6 is automatically switched in conjunction with the switching of the voltage tap of the transformer 5 using the limit switches A', to C'. Alternatively, it may be configured to switch manually.
以上説明したように、本発明によれば、タップ切換可能
な変圧器の一次側と二次側を流れる夫々の電流を、夫々
変流器を介して比率差動継電器に入力し、前記変圧器の
内部短絡による該比率差動継電器の動作により該変圧器
への電力供給を遮断するようにした変圧器内部短絡保護
装置において、前記変圧器のタップ切換側に配設された
変流器に、変流比切換手段を設ける構成としたから、比
率差動継電器の動作点を変圧器の電圧タップ切換にかか
わらずほぼ一定とすることができる。従って、変圧器の
電流タップを切換えたとしても、変圧器の内部が短絡す
れば、従来の如く変流器を交換或いは電流タップ切換機
構を備えた特殊な比率差動継電器を用いることなく、確
実に変圧器への電力供給を遮断でき、変圧器の焼損事故
を防止できる。As explained above, according to the present invention, the currents flowing through the primary and secondary sides of a tap-switchable transformer are respectively input to a ratio differential relay via a current transformer, In the transformer internal short circuit protection device, the power supply to the transformer is cut off by the operation of the ratio differential relay due to an internal short circuit of the transformer, the current transformer disposed on the tap switching side of the transformer, Since the current transformation ratio switching means is provided, the operating point of the ratio differential relay can be kept substantially constant regardless of voltage tap switching of the transformer. Therefore, even if the current tap of the transformer is changed, if a short circuit occurs inside the transformer, it can be reliably fixed without replacing the current transformer or using a special ratio differential relay equipped with a current tap switching mechanism as in the past. The power supply to the transformer can be cut off immediately, preventing transformer burnout accidents.
第1図は変圧器の内部短絡保護装置の概略全体図、第2
図は同上変圧器の一次側の巻線構成図、第3図は本発明
の一実施例である変流器の二次側巻線構成図である。
3.4・・・遮断器 5・・・変圧器 6,7・・・比
率差動継電器 】1・・・変圧器の一次側巻線 12・
・・選択スイッチ 13・・・変流器の二次側巻線14
a 、 14 b 、 14 c−電流タップ A、
B、C・・・電圧タップ A’、B’、C′・・・リミ
ットスイッチ
代理人 大音 増雄(ほか2名)Figure 1 is a schematic overall diagram of the internal short-circuit protection device of a transformer, Figure 2
The figure is a diagram of the primary winding configuration of the transformer, and FIG. 3 is a diagram of the secondary winding configuration of a current transformer according to an embodiment of the present invention. 3.4... Breaker 5... Transformer 6,7... Ratio differential relay ]1... Primary winding of transformer 12.
... Selection switch 13 ... Secondary winding of current transformer 14
a, 14 b, 14 c - current tap A,
B, C... Voltage taps A', B', C'... Limit switch agent Masuo Oone (and 2 others)
Claims (2)
る夫々の電流を、夫々変流器を介して比率差動継電器に
入力し、前記変圧器の内部短絡による該比率差動継電器
の動作により該変圧器への電力供給を遮断するようにし
た変圧器の内部短絡保護装置において、前記変圧器のタ
ップ切換側に配設された変流器に、変流比切換手段を設
けたことを特徴とする変圧器の内部短絡保護装置。(1) The currents flowing through the primary and secondary sides of a transformer capable of switching the taps are respectively input to a ratio differential relay via a current transformer, and the ratio differential relay is activated by an internal short circuit in the transformer. In the internal short-circuit protection device for a transformer, which cuts off the power supply to the transformer by the operation of An internal short-circuit protection device for a transformer, characterized by:
切換ねることを特徴とする特許請求の範囲第1項記載の
変圧器の内部短絡保護装置。(2) The internal short-circuit protection device for a transformer according to claim 1, wherein the current transformation ratio switching means is switched in conjunction with the tap switching of the transformer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11461983A JPS605731A (en) | 1983-06-24 | 1983-06-24 | Internal shortcircuit protecting device of transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11461983A JPS605731A (en) | 1983-06-24 | 1983-06-24 | Internal shortcircuit protecting device of transformer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS605731A true JPS605731A (en) | 1985-01-12 |
Family
ID=14642386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11461983A Pending JPS605731A (en) | 1983-06-24 | 1983-06-24 | Internal shortcircuit protecting device of transformer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS605731A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62196019A (en) * | 1986-02-24 | 1987-08-29 | 三菱電機株式会社 | Differential relay for transformer protection |
JPS62196018A (en) * | 1986-02-24 | 1987-08-29 | 三菱電機株式会社 | Differential relay for transformer protection |
JPS62207125A (en) * | 1986-03-05 | 1987-09-11 | 三菱電機株式会社 | Differential relay for protecting transformer |
-
1983
- 1983-06-24 JP JP11461983A patent/JPS605731A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62196019A (en) * | 1986-02-24 | 1987-08-29 | 三菱電機株式会社 | Differential relay for transformer protection |
JPS62196018A (en) * | 1986-02-24 | 1987-08-29 | 三菱電機株式会社 | Differential relay for transformer protection |
JPH0546774B2 (en) * | 1986-02-24 | 1993-07-14 | Mitsubishi Electric Corp | |
JPH0546775B2 (en) * | 1986-02-24 | 1993-07-14 | Mitsubishi Electric Corp | |
JPS62207125A (en) * | 1986-03-05 | 1987-09-11 | 三菱電機株式会社 | Differential relay for protecting transformer |
JPH0546776B2 (en) * | 1986-03-05 | 1993-07-14 | Mitsubishi Electric Corp |
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