JPH056723A - Switch current reducing circuit for disconnector - Google Patents
Switch current reducing circuit for disconnectorInfo
- Publication number
- JPH056723A JPH056723A JP15668791A JP15668791A JPH056723A JP H056723 A JPH056723 A JP H056723A JP 15668791 A JP15668791 A JP 15668791A JP 15668791 A JP15668791 A JP 15668791A JP H056723 A JPH056723 A JP H056723A
- Authority
- JP
- Japan
- Prior art keywords
- disconnector
- circuit
- resistance element
- short
- ptc resistance
- 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
- 230000001629 suppression Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電路の開閉時に流れる
過大電流を低減してアークの発生を抑制する断路器の開
閉電流低減回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching current reduction circuit for a disconnector, which reduces an excessive current flowing when switching an electric circuit to suppress arc generation.
【０００２】[0002]
【従来の技術】断路器は、電力機器の点検修理等の際、
電源からの分離を確実に行うために使用される。図２は
断路器を電力機器に取り付けた場合の接続図である。図
２に示すように、断路器１０は、通常、電路中に遮断器
２０と隣接して取り付けられ、遮断器２０で大電流を遮
断した後に断路器１０で開成し、一方、断路器１０を閉
成した後に遮断器２０を投入している。近年は、ＳＦ6
ガス中に収容された断路器も広く使用されている。2. Description of the Related Art Disconnectors are used for inspection and repair of electric power equipment.
Used to ensure isolation from the power supply. FIG. 2 is a connection diagram when the disconnector is attached to a power device. As shown in FIG. 2, the disconnector 10 is normally installed adjacent to the circuit breaker 20 in an electric circuit, and interrupts a large current by the circuit breaker 20 before being opened by the disconnector 10, while the disconnector 10 is closed. The circuit breaker 20 is turned on after the circuit is closed. In recent years, SF 6
Disconnectors housed in gas are also widely used.
【０００３】[0003]
【発明が解決しようとする課題】ところで、遮断器２０
による遮断後であっても、電路にはケーブルやコンデン
サによる充電電流が流れている。したがって、断路器を
開成すると、この充電電流を急激に遮断することにな
り、開成直後に電極間にアークが発生してしまう。同様
に、断路器を閉成するときも、充電電流とともに過大な
突入電流が過渡的に流れるためアークが発生していま
う。このアークにより断路器の絶縁破壊が生じ、更に電
極の消耗も促進される問題があった。そのため、従来は
断路器の容積を増して絶縁を強化するとともに、その電
極に高価な合金電極材を使用せざるを得ず、断路器１０
の製造コストが極めて高くなる問題があった。By the way, the circuit breaker 20
Even after the interruption due to, the charging current due to the cable and capacitor still flows in the circuit. Therefore, when the disconnector is opened, this charging current is suddenly cut off, and an arc is generated between the electrodes immediately after the opening. Similarly, when the disconnector is closed, an excessive inrush current transiently flows with the charging current, and an arc is generated. This arc causes a dielectric breakdown of the disconnecting switch and further accelerates the consumption of the electrode. Therefore, conventionally, the volume of the disconnecting switch has been increased to strengthen the insulation, and an expensive alloy electrode material has to be used for the electrode.
There was a problem that the manufacturing cost of the
【０００４】また、特にＳＦ6ガス絶縁の断路器では、
アークにより発生する分解生成物（ガス）の雰囲気への
影響が重大となっており、そのため、水分管理、絶縁材
料、金属表面への十分な配慮を要するという問題もあっ
た。Also, especially in the case of SF 6 gas-insulated disconnectors,
The influence of the decomposition product (gas) generated by the arc on the atmosphere is significant, and there is also a problem that it is necessary to give sufficient consideration to moisture management, insulating materials, and metal surfaces.
【０００５】本発明はかかる問題点に鑑みて創案された
もので、その目的とするところは、電路の開閉時の過大
な充電電流および突入電流（以下、開閉電流と称する）
を低減させる断路器の開閉電流低減回路を提供すること
にある。The present invention has been made in view of the above problems, and an object thereof is an excessive charging current and inrush current (hereinafter referred to as switching current) when the electric circuit is opened and closed.
It is an object of the present invention to provide a switching current reduction circuit for a disconnecting switch that reduces the voltage.
【０００６】[0006]
【課題を解決するための手段】本発明による断路器の開
閉電流低減回路は、断路器と直列に電路に挿入接続され
たＰＴＣ（Positive Temperature Coefficient)抵抗素
子と、該ＰＴＣ抵抗素子と並列に前記電路に接続され、
その閉成時には前記ＰＴＣ抵抗素子を短絡させる短絡ス
イッチと、該短絡スイッチを開閉駆動する駆動手段とを
有し、前記短絡スイッチは、前記駆動手段により前記断
路器の開成に先立って開成し、一方、前記断路器の閉成
後に閉成して、開閉電流がＰＴＣ抵抗素子を流れるよう
にしたものである。A circuit for reducing the switching current of a disconnector according to the present invention comprises a PTC (Positive Temperature Coefficient) resistance element which is inserted and connected to a circuit in series with the disconnector, and the PTC resistance element connected in parallel with the PTC resistance element. Connected to the circuit,
When the switch is closed, it has a short-circuit switch for short-circuiting the PTC resistance element, and a drive means for driving the short-circuit switch to open and close. The short-circuit switch is opened by the drive means prior to the opening of the disconnector, and The switching device is closed after the disconnecting switch so that the switching current flows through the PTC resistance element.
【０００７】[0007]
【作用】断路器を開成して充電電流を遮断するときは、
まず短絡スイッチが断路器の開成に先立って開成する。
これにより、充電電流がＰＴＣ抵抗素子に流れる。ＰＴ
Ｃ抵抗素子に充電電流が流れると、ジュール熱によりそ
の抵抗値が急激に増加するので該充電電流の値が急激に
低減する。低減した時点で断路器が開成するので遮断時
の充電電流が極小となり、アークの発生が抑制される。[Function] When the disconnecting switch is opened to cut off the charging current,
First, the short circuit switch is opened prior to the opening of the disconnector.
As a result, the charging current flows through the PTC resistance element. PT
When the charging current flows through the C resistance element, its resistance value rapidly increases due to Joule heat, so that the value of the charging current sharply decreases. Since the disconnecting switch is opened at the time of reduction, the charging current at the time of interruption is minimized and the generation of arc is suppressed.
【０００８】一方、断路器を閉成するときは既に短絡ス
イッチが開成されているので、閉成直後の突入電流およ
び充電電流はＰＴＣ抵抗素子を流れ、急激に低減する。
これにより断路器を流れる電流が極小となり、アークの
発生が抑制される。その後、短絡スイッチが閉成してＰ
ＴＣ抵抗素子を短絡させ、定常状態となる。On the other hand, when the disconnector is closed, the short-circuit switch has already been opened. Therefore, the inrush current and the charging current immediately after the closing flow through the PTC resistance element and are rapidly reduced.
This minimizes the current flowing through the disconnector and suppresses arcing. After that, the short-circuit switch is closed and P
The TC resistance element is short-circuited to enter a steady state.
【０００９】[0009]
【実施例】以下、図面を参照して本発明の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１（ａ）（ｂ）は、各々本発明の一実施
例に係る開閉電流低減回路の構成図である。これらの図
において、１，１’は開閉電流低減回路、２はＰＴＣ抵
抗素子、３は短絡スイッチを示す。また、従来と同様、
１０は断路器、２０は遮断器を示す。1A and 1B are block diagrams of a switching current reduction circuit according to an embodiment of the present invention. In these figures, 1 and 1'indicate switching circuit reduction circuits, 2 are PTC resistance elements, and 3 is a short-circuit switch. Also, as before,
Reference numeral 10 is a disconnecting switch, and 20 is a circuit breaker.
【００１１】図１（ａ）を参照すると、開閉電流低減回
路１は、電路に断路器１０と直列に挿入接続されたＰＴ
Ｃ抵抗素子２と、該ＰＴＣ抵抗素子２と並列に電路に接
続された短絡スイッチ３と、図示を省略した駆動手段と
で構成されている。Referring to FIG. 1 (a), a switching current reduction circuit 1 has a PT which is inserted and connected in series with a disconnector 10 in an electric circuit.
It is composed of a C resistance element 2, a short-circuit switch 3 connected in parallel with the PTC resistance element 2 to an electric path, and a driving means (not shown).
【００１２】開閉電流の容量が大きいときは、図１
（ｂ）に示すように、複数のＰＴＣ抵抗素子２を並列接
続して開閉電流低減回路１’を構成する。When the capacity of the switching current is large, as shown in FIG.
As shown in (b), a plurality of PTC resistance elements 2 are connected in parallel to form a switching current reduction circuit 1 '.
【００１３】ＰＴＣ抵抗素子２は、低電流のときは低抵
抗値であるが、電流の増加によりジュール熱が発生して
その抵抗値が急激に増加する素子で、例えば（Ｖ1-XＣ
ｒX）2Ｏ3（但し、０≦Ｘ≦０.０１５）を１１００℃以
上で仮焼し、この仮焼物に焼結助剤としてＦｅを混合
し、更に、この混合物を１５３５℃以上の熱で焼成する
ことで得られるもの（本発明者らによる特願平２−１９
８４５３号明細書参照）を用いる。The PTC resistance element 2 has a low resistance value when the current is low, but Joule heat is generated by an increase in the current and the resistance value is rapidly increased. For example, (V 1 -X C
r X ) 2 O 3 (where 0 ≦ X ≦ 0.015) is calcined at 1100 ° C. or higher, Fe is mixed with this calcined product as a sintering aid, and the mixture is heated at 1535 ° C. or higher. What is obtained by firing at (Japanese Patent Application No. 2-19 of the present inventors)
8453).
【００１４】また、短絡スイッチ３はＰＴＣ抵抗素子２
と並列に前記電路に接続され、図示を省略した駆動手
段、例えばタイマ内蔵の電磁駆動回路により開閉駆動さ
れる。この短絡スイッチ３は、定常時には閉成してＰＴ
Ｃ抵抗素子２を短絡させているが、断路器１０が開閉す
るときは電磁駆動回路が作動してその開成に先立って開
成し、一方、断路器１０が閉成するときは電磁駆動回路
により断路器１０閉成後に閉成する。これにより、断路
器１０の開成直前および閉成直後の開閉電流がＰＴＣ抵
抗素子２を流れる。ＰＴＣ抵抗素子２に開閉電流が流れ
ると、ジュール熱によりその抵抗値が急激に増加し、電
流値が１／３〜１／４程度に低減する。Further, the short-circuit switch 3 is a PTC resistance element 2
Is connected in parallel to the electric circuit and is opened / closed by a driving means (not shown), for example, an electromagnetic driving circuit with a built-in timer. This short-circuit switch 3 is closed in the steady state and PT
Although the C resistance element 2 is short-circuited, when the disconnector 10 opens and closes, the electromagnetic drive circuit operates and opens prior to its opening, while when the disconnector 10 closes, the electromagnetic drive circuit disconnects. It closes after the container 10 is closed. As a result, the switching currents immediately before and after the disconnector 10 is opened flow through the PTC resistance element 2. When a switching current flows through the PTC resistance element 2, its resistance value increases rapidly due to Joule heat, and the current value decreases to about 1/3 to 1/4.
【００１５】したがって、電路の遮断時は、充電電流が
十分低減した時点で断路器１０が開成するので、アーク
の発生が著しく抑制されるとともに、電極の負担が断路
器１０単体の場合に比べて大幅に軽減され、その消耗が
緩和される。Therefore, when the electric circuit is cut off, the disconnecting switch 10 is opened when the charging current is sufficiently reduced, so that the generation of arc is remarkably suppressed, and the load on the electrode is greater than that of the disconnecting switch 10 alone. It is greatly reduced and its consumption is reduced.
【００１６】同様に、断路器１０の閉成直後は突入電流
および充電電流が急激に低減するので、断路器１０を流
れる電流が極小となり、アークの発生が著しく抑制され
る。また断路器１０の電極の消耗も大幅に緩和される。
また、定常電流に復帰した後、短絡スイッチが閉成して
ＰＴＣ抵抗素子を短絡させるので、その後の電力ロスが
なくなる。Similarly, immediately after the disconnecting switch 10 is closed, the inrush current and the charging current are drastically reduced, so that the current flowing through the disconnecting switch 10 is minimized and the arc generation is significantly suppressed. In addition, the consumption of the electrodes of the disconnector 10 is greatly reduced.
Further, after the normal current is restored, the short-circuit switch is closed to short-circuit the PTC resistance element, so that the power loss thereafter disappears.
【００１７】なお、開閉電流の低減量は、ＰＴＣ抵抗素
子２の数を増すことで更に増加させることができる。The reduction amount of the switching current can be further increased by increasing the number of PTC resistance elements 2.
【００１８】[0018]
【発明の効果】以上の説明のとおり、本発明に係る断路
器の開閉電流抑制回路は、短絡スイッチの切り替えによ
り、断路器の開成直前および閉成直後に流れる開閉電流
をＰＴＣ抵抗素子に流して急激に低減させるようにした
ので、断路器の開閉時のアーク発生が抑制されるととも
に、電極の消耗が従来に比べて大幅に緩和されるという
優れた効果を有する。特に、ＳＦ6絶縁による断路器で
は、分解生成物（ガス）の発生が抑制されるのでその効
果は絶大なものがある。As described above, in the switching current suppressing circuit for a disconnector according to the present invention, by switching the short-circuit switch, the switching current flowing immediately before and immediately after the disconnector is passed through the PTC resistance element. Since it is designed to be drastically reduced, it has an excellent effect that the arc generation at the time of opening and closing the disconnector is suppressed and the consumption of the electrode is significantly reduced as compared with the conventional case. In particular, in a disconnecting switch with SF 6 insulation, the generation of decomposition products (gas) is suppressed, so that its effect is great.
【００１９】また、断路器が小容量のもので済み、容積
を小型にすることができるとともに、他の使用素材も安
価なものとすることができるので、断路器のトータルコ
ストを低くすることができるという効果も有する。Further, since the disconnecting switch only needs to have a small capacity, the volume can be made small, and other materials can be made inexpensive, so that the total cost of the disconnecting switch can be reduced. It also has the effect of being able to.
【図１】本発明の一実施例に係る断路器の開閉電流低減
回路の構成図であり、（ａ）はＰＴＣ抵抗素子が一つの
場合、（ｂ）はＰＴＣ抵抗素子が二つの場合の構成図で
ある。FIG. 1 is a configuration diagram of a switching current reduction circuit for a disconnecting switch according to an embodiment of the present invention, where (a) is a configuration with one PTC resistance element and (b) is a configuration with two PTC resistance elements. It is a figure.
【図２】電力機器における従来の断路器の接続図であ
る。FIG. 2 is a connection diagram of a conventional disconnector in a power device.
１，１’…開閉電流低減回路、２…ＰＴＣ抵抗素子、３
…短絡スイッチ、１０…断路器、２０…遮断器。1, 1 '... Switching current reduction circuit, 2 ... PTC resistance element, 3
... short-circuit switch, 10 ... disconnector, 20 ... circuit breaker.
Claims (2)
に流れる開閉電流を低減する回路であって、前記断路器
と直列に前記電路に挿入接続されたＰＴＣ抵抗素子と、
該ＰＴＣ抵抗素子と並列に前記電路に接続され、その閉
成時には前記ＰＴＣ抵抗素子を短絡させる短絡スイッチ
と、該短絡スイッチを開閉駆動する駆動手段とを有し、
前記短絡スイッチは、前記駆動手段により前記断路器の
開成に先立って開成し、一方、前記断路器の閉成後に閉
成して、前記開閉電流がＰＴＣ抵抗素子を流れるように
したことを特徴とする断路器の開閉電流抑制回路。1. A circuit for reducing a switching current flowing in an electric circuit immediately before opening and immediately after closing the disconnector, the PTC resistance element being inserted and connected to the electric circuit in series with the disconnector,
A short-circuit switch that is connected to the electric circuit in parallel with the PTC resistance element and short-circuits the PTC resistance element when the PTC resistance element is closed; and driving means that opens and closes the short-circuit switch.
The short-circuit switch is opened by the driving means prior to the opening of the disconnecting switch, while it is closed after closing the disconnecting switch so that the switching current flows through the PTC resistance element. Switching circuit suppression circuit for disconnector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15668791A JPH056723A (en) | 1991-06-27 | 1991-06-27 | Switch current reducing circuit for disconnector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15668791A JPH056723A (en) | 1991-06-27 | 1991-06-27 | Switch current reducing circuit for disconnector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH056723A true JPH056723A (en) | 1993-01-14 |
Family
ID=15633135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15668791A Pending JPH056723A (en) | 1991-06-27 | 1991-06-27 | Switch current reducing circuit for disconnector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH056723A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666254A (en) * | 1995-09-14 | 1997-09-09 | Raychem Corporation | Voltage sensing overcurrent protection circuit |
| US5689395A (en) * | 1995-09-14 | 1997-11-18 | Raychem Corporation | Overcurrent protection circuit |
| US5737160A (en) * | 1995-09-14 | 1998-04-07 | Raychem Corporation | Electrical switches comprising arrangement of mechanical switches and PCT device |
| US5864458A (en) * | 1995-09-14 | 1999-01-26 | Raychem Corporation | Overcurrent protection circuits comprising combinations of PTC devices and switches |
-
1991
- 1991-06-27 JP JP15668791A patent/JPH056723A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666254A (en) * | 1995-09-14 | 1997-09-09 | Raychem Corporation | Voltage sensing overcurrent protection circuit |
| US5689395A (en) * | 1995-09-14 | 1997-11-18 | Raychem Corporation | Overcurrent protection circuit |
| US5737160A (en) * | 1995-09-14 | 1998-04-07 | Raychem Corporation | Electrical switches comprising arrangement of mechanical switches and PCT device |
| US5864458A (en) * | 1995-09-14 | 1999-01-26 | Raychem Corporation | Overcurrent protection circuits comprising combinations of PTC devices and switches |
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