JP5078858B2 - Three-phase collective circuit breaker - Google Patents
Three-phase collective circuit breaker Download PDFInfo
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- 230000007257 malfunction Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
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- 230000003111 delayed effect Effects 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012966 insertion method Methods 0.000 description 1
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Description
本発明は、１つの遮断器操作機構で３つの主接点を同時に操作して遮断／投入させる三相一括式遮断器に関し、特に、中性点が直接接地されていない変圧器に適用するのに好適な三相一括式遮断器に関する。 The present invention relates to a three-phase collective circuit breaker in which three main contacts are operated simultaneously by one circuit breaker operating mechanism, and is applied to a transformer whose neutral point is not directly grounded. The present invention relates to a suitable three-phase collective circuit breaker.
３相送電線用の変圧器を充電する際には、図１０に一例を示すように大きな励磁突入電流が発生することがある。
図１０は、３相送電線の第２相および第３相の電圧が小さい状況で三相一括式遮断器を投入したときの一試験結果を示しており、３相送電線の第１相には励磁突入電流は発生していないが、３相送電線の第２相および第３相には大きな励磁突入電流が発生している。なお、同様の投入状況であっても、変圧器が停電した電圧および電流の位相関係に応じて励磁突入電流の大きさは異なる。
When charging a transformer for a three-phase power transmission line, a large magnetizing inrush current may occur as shown in FIG.
FIG. 10 shows a test result when the three-phase collective circuit breaker is turned on in a situation where the voltages of the second phase and the third phase of the three-phase transmission line are small. In the first phase of the three-phase transmission line, No inrush current is generated, but a large inrush current is generated in the second phase and the third phase of the three-phase transmission line. Note that the magnitude of the magnetizing inrush current varies depending on the phase relationship between the voltage and current at which the transformer has lost power even in the same charging situation.
このような励磁突入電流は、瞬時電圧低下を発生させたり、大きさが定格電流の数十倍に達すると変圧器の絶縁、変圧器比率差動継電器の誤動作および電力用コンデンサの誤遮断などの不具合を発生させたりする。 Such an inrush current may cause an instantaneous voltage drop, or if the magnitude reaches several tens of times the rated current, transformer insulation, transformer ratio differential relay malfunction, and power capacitor malfunction It can cause problems.
そこで、励磁突入電流を抑制するために、直接接地系の三相一括式遮断器では、電源側の電圧位相情報から励磁突入電流が小さくなるタイミングを３相送電線の相ごとに検出して、検出したタイミングで三相一括式遮断器を投入する方法が採用されている。
しかし、このような方法は抵抗接地系などに使用される三相一括式遮断器には適用することができないため、抵抗投入方法、変圧器の残留磁束を低減する方法または残留磁束を考慮した遮断器投入方法などが採用されているのが現状である。
Therefore, in order to suppress the excitation inrush current, in the direct grounding type three-phase batch type circuit breaker, the timing at which the excitation inrush current becomes smaller is detected for each phase of the three-phase transmission line from the voltage phase information on the power source side. A method is adopted in which a three-phase collective circuit breaker is inserted at the detected timing.
However, such a method cannot be applied to a three-phase collective circuit breaker used for a resistance grounding system, etc., so a resistance injection method, a method for reducing the residual magnetic flux of the transformer, or a break in consideration of the residual magnetic flux The present situation is that a container charging method is adopted.
なお、下記の特許文献１には、過大な励磁突入電流の発生を防止するために、閉極第一相については、基準相の位相０度を基準点として閉極第一相の残留磁束並びに予め求められている三相遮断器のプレアーク特性および閉極時間ばらつき特性に基づいて投入点における定常磁束値と残留磁束値との最大誤差の絶対値である投入磁束誤差が最小となる閉極位相を算出して閉極第一相の目標閉極位相として設定し、残り二相については、基準相の位相０度を基準点として予め求められている三相遮断器のプレアーク特性および閉極時間ばらつき特性に基づいて残留磁束が“０”である場合に投入磁束誤差が最小となる閉極位相を算出して残り二相の目標閉極位相として設定し、基準点から残り二相の目標閉極位相までの時間と予め設定しておいた三相電源の周期の整数倍に相当する遅延時間とを合計した時間を残り二相の目標閉極時刻として設定するようにした変圧器励磁突入電流抑制装置が開示されている。 In Patent Document 1 below, in order to prevent the occurrence of an excessive magnetizing inrush current, with respect to the closed first phase, the residual magnetic flux of the closed first phase and the phase 0 degree of the reference phase as a reference point are described. The closing phase that minimizes the applied magnetic flux error, which is the absolute value of the maximum error between the steady magnetic flux value and the residual magnetic flux value at the applied point, based on the pre-arc characteristics and the closing time variation characteristics of the three-phase circuit breaker obtained in advance. Is calculated and set as the target closing phase of the first closing phase, and for the remaining two phases, the pre-arc characteristics and closing time of the three-phase circuit breaker that are obtained in advance with the reference phase of 0 degrees as the reference point Based on the variation characteristics, when the residual magnetic flux is “0”, the closing phase that minimizes the applied magnetic flux error is calculated and set as the remaining two-phase target closing phase, and the remaining two-phase target closing from the reference point Preset with time to polar phase And to set the time which is the sum of the delay time corresponding to an integral multiple of the period of the three-phase power supply as the target closing time of the remaining two phases transformer inrush current suppression apparatus is disclosed.
また、下記の特許文献２には、３相一括操作型遮断器で投入した際に生じる励磁突入電流を抵抗体付き遮断器などの設備を付加せずに抑制可能にするために、変圧器に３相交流電圧が定常状態で印加されたときの１次側、２次側または３次側の相電圧若しくは線間電圧を積分することにより変圧器各相の定常磁束を算出し、遮断器が変圧器を遮断した後の変圧器各相の残留磁束の極性および大きさを算出し、変圧器各相の定常磁束の極性と変圧器各相の残留磁束の極性とが同一となる位相が３相分重なる範囲内にあるときに３相の遮断器を同時に投入させるようにした変圧器の励磁突入電流抑制装置が開示されている。
しかしながら、従来の抵抗投入方法では、主接点とは別に抵抗接点が必要となるので、遮断器が高価になるという問題があった。
また、残留磁束を考慮した遮断器投入方法では、三相一括式遮断器では接点が３相一括で動作するため、各相の電流がすべて“０”になるタイミングが存在しないので、励磁突入抑制効果はあるが、実機へ適用すると安定しないという問題がある。
However, the conventional resistance throwing method requires a resistance contact in addition to the main contact, so that the circuit breaker is expensive.
In addition, in the circuit breaker insertion method that takes into account residual magnetic flux, since the contacts operate in a three-phase package in a three-phase package type circuit breaker, there is no timing for all the currents in each phase to be “0”. Although effective, there is a problem that it is not stable when applied to a real machine.
なお、残留磁束を低減する方法もあるが、装置が高額なこともあり、実用に至っていないという問題がある。 Although there is a method of reducing the residual magnetic flux, there is a problem that the apparatus is expensive and not practically used.
上記の特許文献１に開示された変圧器励磁突入電流抑制装置は、一次巻線が中性点接地された星形結線であり二次または三次巻線が三角結線である変圧器に適用するものであり、中性点が直接接地されていない変圧器には適用できないという問題がある。 The transformer magnetizing inrush current suppression device disclosed in Patent Document 1 is applied to a transformer in which the primary winding is a star connection with the neutral point grounded and the secondary or tertiary winding is a triangular connection. Therefore, there is a problem that it cannot be applied to a transformer whose neutral point is not directly grounded.
上記の特許文献２に開示された変圧器の励磁突入電流抑制装置では、変圧器各相の定常磁束と遮断器が変圧器を遮断した後の変圧器各相の残留磁束の極性および大きさとを算出しなければならないという問題がある。 In the transformer inrush current suppression device disclosed in Patent Document 2, the steady magnetic flux of each phase of the transformer and the polarity and magnitude of the residual magnetic flux of each phase of the transformer after the circuit breaker shuts off the transformer. There is a problem that it must be calculated.
本発明の目的は、簡単な構成の遮断器操作機構で励磁突入電流を抑制することができる三相一括式遮断器を提供することにある。 An object of the present invention is to provide a three-phase collective circuit breaker that can suppress an inrush current with a simple circuit breaker operating mechanism.
本発明の三相一括式遮断器は、１つの遮断器操作機構で３つの主接点を同時に操作して遮断／投入させる三相一括式遮断器（１０）であって、前記遮断器操作機構が、前記３つの主接点のうちの１つの主接点を他の２つの主接点よりも１／４サイクルだけ早めに遮断させるとともに、該１つの主接点を該他の２つの主接点よりも１／４サイクルだけ遅めに投入させる主接点遮断／投入手段を具備し、前記主接点遮断／投入手段が、３相送電線の前記１つの主接点に対応する相の電圧が最大になるタイミングで該１つの主接点を遮断させるとともに、該３相送電線の前記他の２つの主接点に対応する他の２つの相の線間電圧が最大になるタイミングで該他の２つの主接点を投入させ、前記主接点遮断／投入手段が、遮断器操作部（１１）と、該遮断器操作部によって上下方向に移動される連結シャフト（１２）と、該連結シャフトに直列に接続された、かつ、第１乃至第３の溝（１３ａ 1 〜１３ａ 3 ）がそれぞれ形成された第１乃至第３のカムプレート（１３ 1 〜１３ 3 ）と、第１乃至第３の連結具（１４ 1 〜１４ 3 ）と、該第１乃至第３の連結具を介して前記３つの主接点の第１乃至第３のシャフト（３ 1 〜３ 3 ）とそれぞれ連結された、かつ、前記連結シャフトが前記遮断器操作部によって上下方向に移動されると位置が前記第１乃至第３の溝に沿ってそれぞれ移る第１乃至第３のカムローラ（１３ｂ 1 〜１３ｂ 3 ）とを具備し、前記第１および第２の溝が、前記第１および第２のカムプレートの下端付近から上方に直線的に延びた第１および第２の直線部と、該第１および第２の直線部の上端から斜め上方に直線的に延びた第１および第２の斜線部とからなり、前記第３の溝が、前記第３のカムプレートの下端付近から前記斜め上方に直線的に延びた第３の斜線部と、該第３の斜線部の上端から上方に直線的に延びた第３の直線部とからなることを特徴とする。
ここで、前記第１乃至第３の溝の上下方向の長さが同じにされており、前記第１乃至第３の溝の前記第１乃至第３の直線部の上下方向の長さと該第１乃至第３の溝の前記第１乃至第３の斜線部の上下方向の長さとが同じにされていてもよい。
前記第１および第２の溝の前記第１および第２の直線部の上下方向の長さと前記第３の溝の前記第３の斜線部の上下方向の長さとが、前記第３のガイドローラの位置が該第３の斜線部の下端から上端まで移ると、該第３のガイドローラと前記第３の連結具を介して連結された前記第３のシャフトが該第３の斜線部の左右方向の長さ分だけ該左右方向の一方の方向に移動することにより前記１つの主接点が遮断される長さとされており、前記第１および第２の溝の前記第１および第２の斜線部の上下方向の長さと前記第３の溝の前記第３の直線部の上下方向の長さとが、前記第１および第２のガイドローラの位置が該第１および第２の斜線部の上端から下端までそれぞれ移ると、該第１および第２のガイドローラと前記第１および第２の連結具を介してそれぞれ連結された前記第１および第２のシャフトが該第１および第２の斜線部の左右方向の長さ分だけ該左右方向の他方の方向にそれぞれ移動することにより前記他の２つの主接点が投入される長さとされていてもよい。
前記遮断器操作部によって前記連結シャフトを下方に移動する速さが、前記第１乃至第３のガイドローラの位置が前記第１乃至第３の溝の下端から上端にそれぞれ移る間に前記１つの主接点が遮断されてから１／４サイクル経過後に前記他の２つの主接点が遮断されるように設定されており、前記遮断器操作部によって前記連結シャフトを上方に移動する速さが、前記第１乃至第３のガイドローラの位置が前記第１乃至第３の溝の上端から下端にそれぞれ移る間に前記他の２つの主接点が投入されてから１／４サイクル経過後に前記１つの主接点が投入されるように設定されていてもよい。
前記主接点遮断／投入手段が、外部から変圧器停止信号が入力されると、前記３相送電線の３つの相電圧（Ｖ1〜Ｖ3）のうち前記１つの主接点に対応する１つの相電圧が最大となるタイミングで該１つの主接点が遮断されるように前記連結シャフトを下方に移動させるよう指示する遮断指令信号を生成して、該生成した遮断指令信号を前記遮断器操作部に出力するとともに、外部から変圧器充電信号が入力されると、前記３つの相電圧のうち前記他の２つの主接点に対応する他の２つの相電圧の差電圧が最大となるタイミングで該他の２つの主接点が投入されるように前記連結シャフトを上方に移動させるよう指示する投入指令信号を生成して、該生成した投入指令信号を前記遮断器操作部に出力する操作制御部（１５）をさらに具備してもよい。
The three-phase collective circuit breaker of the present invention is a three-phase collective circuit breaker (10) that simultaneously operates and shuts off three main contacts with a single circuit breaker operating mechanism. , One main contact of the three main contacts is cut off by 1/4 cycle earlier than the other two main contacts, and the one main contact is cut off by 1 / of the other two main contacts. The main contact breaking / closing means is turned on late by 4 cycles, and the main contact breaking / closing means is at the timing when the voltage of the phase corresponding to the one main contact of the three-phase transmission line becomes maximum. One main contact is shut off, and the other two main contacts are turned on at the timing when the line voltage of the other two phases corresponding to the other two main contacts of the three-phase transmission line becomes maximum. The main contact breaking / closing means includes a circuit breaker operating section (11), A connecting shaft to be moved in the vertical direction by cross-actuating part (12), connected in series with said connecting shaft, and the first to third grooves (13a 1 ～13A 3) are formed respectively 1st to 3rd cam plates (13 1 to 13 3 ), 1st to 3rd connecting tools (14 1 to 14 3 ), and the three main contacts via the 1st to 3rd connecting tools The first to third shafts (3 1 to 3 3 ) are connected to each other, and when the connecting shaft is moved in the vertical direction by the circuit breaker operating portion, the position is changed to the first to third grooves. and a first to third cam roller moves respectively (13b 1 13 b 3) along said first and second grooves, straight upwards from the lower end vicinity of the first and second cam plates Extending first and second straight portions, and the first and second The first and second hatched portions linearly extend diagonally upward from the upper end of the linear portion, and the third groove extends linearly upward from the vicinity of the lower end of the third cam plate. The third oblique line portion and a third straight line portion linearly extending upward from the upper end of the third oblique line portion .
Here, the vertical lengths of the first to third grooves are the same, and the vertical lengths of the first to third straight portions of the first to third grooves are the same as the vertical lengths of the first to third grooves. The vertical lengths of the first to third hatched portions of the first to third grooves may be the same.
The length of the first and second straight portions of the first and second grooves in the vertical direction and the length of the third hatched portion of the third groove in the vertical direction are the third guide rollers. Is moved from the lower end to the upper end of the third hatched portion, the third shaft connected to the third guide roller via the third connector is moved to the left and right of the third hatched portion. The one main contact is blocked by moving in one of the left and right directions by the length of the direction, and the first and second diagonal lines of the first and second grooves The vertical length of the third groove and the vertical length of the third linear portion of the third groove are the upper ends of the first and second hatched portions. The first and second guide rollers and the first and second coupling members move from the first to the lower end respectively. The first and second shafts respectively connected through the first and second shafts move in the other direction of the left and right direction by the length of the left and right direction of the first and second hatched portions, respectively. It may be the length to which the main contact is inserted.
The speed at which the connection shaft is moved downward by the circuit breaker operating unit is such that the position of the first to third guide rollers moves from the lower end to the upper end of the first to third grooves, respectively. The other two main contacts are set to be cut off after a ¼ cycle has elapsed since the main contact was cut off, and the speed at which the connecting shaft is moved upward by the breaker operating unit is While the first to third guide rollers are moved from the upper end to the lower end of the first to third grooves, the one main main roller is inserted after ¼ cycle has elapsed since the other two main contacts are inserted. You may set so that a contact may be thrown in.
When the transformer contact signal is input from the outside, the main contact breaking / closing means outputs one of the three phase voltages (V 1 to V 3 ) corresponding to the one main contact. Generating a shut-off command signal instructing to move the connecting shaft downward so that the one main contact is shut off at a timing when the phase voltage becomes maximum, and the generated shut-off command signal is used as the breaker operation unit; When a transformer charging signal is input from the outside, the difference voltage between the other two phase voltages corresponding to the other two main contacts among the three phase voltages is maximized. An operation control unit that generates a closing command signal for instructing to move the connecting shaft upward so that the other two main contacts are switched on, and outputs the generated closing command signal to the circuit breaker operating unit ( 15) Good.
本発明の三相一括式遮断器は、以下に示す効果を奏する。
（１）３つの主接点のうちの１つの主接点を他の２つの主接点よりも１／４サイクルだけ早めに遮断させるとともに、当該１つの主接点を当該他の２つの主接点よりも１／４サイクルだけ遅めに投入させる主接点遮断／投入手段を遮断器操作機構に備えさせることにより、簡単な構成の遮断器操作機構で励磁突入電流を抑制することができる。
（２）励磁突入電流を抑制することができるため、主接点の磨耗を抑制することができるので、三相一括式遮断器の内部開放点検の延伸化が可能となり、コスト低減が図れる。
（３）励磁突入電流を抑制することができるため、瞬時電圧変動を抑制することができるので、顧客サービスの向上が図れる。
（４）短絡容量が小さい電力系統に比較的大容量の変圧器を設置することができる。
The three-phase collective circuit breaker of the present invention has the following effects.
(1) One main contact of the three main contacts is interrupted by 1/4 cycle earlier than the other two main contacts, and the one main contact is set to 1 more than the other two main contacts. By providing the circuit breaker operating mechanism with the main contact breaking / closing means that is turned on late by / 4 cycles, the magnetizing inrush current can be suppressed with a simple circuit breaker operating mechanism.
(2) Since the magnetizing inrush current can be suppressed, the wear of the main contact can be suppressed, so that the internal open inspection of the three-phase batch type circuit breaker can be extended and the cost can be reduced.
(3) Since the inrush current can be suppressed, the instantaneous voltage fluctuation can be suppressed, so that customer service can be improved.
(4) A relatively large-capacity transformer can be installed in an electric power system with a small short-circuit capacity.
上記の目的を、３つの主接点のうちの１つの主接点を他の２つの主接点よりも１／４サイクルだけ早めに遮断させるとともに、当該１つの主接点を当該他の２つの主接点よりも１／４サイクルだけ遅めに投入させる主接点遮断／投入手段を遮断器操作機構に備えさせることにより実現した。 For the above purpose, one main contact of the three main contacts is shut off by 1/4 cycle earlier than the other two main contacts, and the one main contact is disconnected from the other two main contacts. This is realized by providing the circuit breaker operating mechanism with a main contact breaking / closing means for making it delayed by 1/4 cycle later.
以下、本発明の三相一括式遮断器の実施例について図面を参照して説明する。
まず、本発明の三相一括式遮断器における励磁突入電流抑制の原理について説明する。
一般的に、変圧器を停止したタイミングで変圧器を充電すれば、変圧器の鉄心が飽和するような電流の流れにならないので、励磁突入電流を抑制することができる。しかし、実際には、遮断器は、主接点（主回路）が開放された時点ではなく、電流が“０”になった時点付近で遮断されることになる。また、変圧器励磁電流は電圧と９０度の位相差があるため、電圧が最大のタイミングで遮断器を遮断することが理想であるが、三相一括式遮断器では実現することができない。
そこで、三相一括式遮断器の３つの主接点のうち１つの主接点が他の２つの主接点に対して遮断時には先行して動作するとともに投入時には遅れて動作するように３つの主接点の動作タイミングに差を持たせて、電圧が最大のタイミングで三相一括式遮断器の遮断および投入を行えば、励磁突入電流を抑制することが可能になる。
Hereinafter, embodiments of the three-phase collective circuit breaker of the present invention will be described with reference to the drawings.
First, the principle of suppressing the magnetizing inrush current in the three-phase collective circuit breaker of the present invention will be described.
Generally, if the transformer is charged at the timing when the transformer is stopped, a current flow that saturates the iron core of the transformer does not occur, so that an inrush current can be suppressed. However, in actuality, the circuit breaker is not interrupted when the main contact (main circuit) is opened, but near the time when the current becomes “0”. Also, since the transformer excitation current has a phase difference of 90 degrees from the voltage, it is ideal to break the circuit breaker at the timing when the voltage is maximum, but this cannot be realized with a three-phase collective circuit breaker.
Therefore, of the three main contacts of the three-phase collective circuit breaker, one main contact operates before the other two main contacts at the time of interruption and operates at a delay when turned on. If the three-phase batch type circuit breaker is shut off and turned on at the timing when the voltage is maximum with a difference in operation timing, it is possible to suppress the magnetizing inrush current.
具体的には、三相一括式遮断器の３つの主接点のうち１つの主接点のみ１／４サイクルだけずれて動作する（遮断時は１／４サイクルだけ早めに遮断し、投入時には１／４サイクルだけ遅めに投入する）ように、遮断器操作機構リンク部に時間差（不揃い）を設ける。
すなわち、三相一括式遮断器の遮断時には、１／４サイクルだけ早めに遮断させる１つの主接点に対応する相の電圧が最大になるタイミングでこの１つの主接点が遮断されるように制御すれば、他の２つの主接点に対応する２つの相の線間電圧が最大になるタイミングでこの２つの主接点が遮断されることになるので、３相ともに電流が“０”付近で停電することになる。
また、三相一括式遮断器の投入時には、１／４サイクルだけ早めに投入される２つの主接点に対応する２つの相の線間電圧が最大になるタイミングでこの２つの主接点が投入されるように制御すれば、残りの１つの主接点に対応する相の電圧が最大になるタイミングでこの１つの主接点が投入されることになるので、励磁突入電流を完全に抑制することができる。
Specifically, only one main contact out of the three main contacts of the three-phase batch type circuit breaker operates with a shift of 1/4 cycle (when shutting off, it shuts off early by 1/4 cycle and when turned on, 1 / The circuit breaker operation mechanism link portion is provided with a time difference (unevenness) so that it is introduced later by 4 cycles.
That is, when the three-phase batch type circuit breaker is shut off, control is performed so that the one main contact is shut off at the timing when the voltage of the phase corresponding to one main contact that is shut off early by 1/4 cycle is maximized. For example, since the two main contacts are cut off at the timing when the line voltage of the two phases corresponding to the other two main contacts becomes maximum, the power outages occur near “0” in all three phases. It will be.
In addition, when the three-phase batch type circuit breaker is turned on, the two main contacts are turned on at the timing when the line voltage of the two phases corresponding to the two main contacts turned on earlier by 1/4 cycle becomes maximum. If this control is performed, this one main contact is turned on at the timing when the voltage of the phase corresponding to the remaining one main contact becomes maximum, so that the magnetizing inrush current can be completely suppressed. .
次に、上述した本発明の三相一括式遮断器における励磁突入電流抑制の原理についての実証試験について、図５乃至図９を参照して説明する。
なお、この実証試験は、図５に示すように、三相一括式遮断器の第３相の遮断器可動接点（以下、「第３の遮断器可動接点５１3」と称する。）の長さを三相一括式遮断器の第１相の遮断器可動接点（以下、「第１の遮断器可動接点５１1」と称する。）および三相一括式遮断器の第２相の遮断器可動接点（以下、「第２の遮断器可動接点５１2」と称する。）の長さよりも短くして行った。
Next, a verification test on the principle of suppressing the magnetizing inrush current in the above-described three-phase collective circuit breaker of the present invention will be described with reference to FIGS.
In this demonstration test, as shown in FIG. 5, the length of the third-phase circuit breaker movable contact (hereinafter referred to as “third circuit breaker movable contact 51 3 ”) of the three-phase collective circuit breaker. Are the first phase breaker movable contact (hereinafter referred to as “first breaker movable contact 51 1 ”) of the three-phase collective circuit breaker and the second phase breaker movable contact of the three-phase collective circuit breaker. (Hereinafter referred to as “second breaker movable contact 51 2 ”).
まず、変圧器停止時の実証試験について、図６および図７を参照して説明する。
この実証試験では、３相送電線の第１相の図６の（ａ）に示す電源電圧が最小になる時刻ｔ1において三相一括式遮断器の遮断動作を開始させ（図７（ａ）参照）、１／４サイクルだけ早めに遮断させる３相送電線の第３相の電源電圧が最大付近になる時刻ｔ2で第３の遮断器可動接点５１3の先端が第３の遮断器固定接点５２3から離れるようにしたのち（図７（ｂ）参照）、時刻ｔ2から１／４サイクル経過後の時刻ｔ3に第１および第２の遮断器可動接点５１1，５１2の先端が第１および第２の遮断器固定接点５２1，５２2からそれぞれ離れるようにした（図７（ｃ）参照）。
この実証試験では、図７の（ｅ）から（ｇ）に示すように、３相送電線の第１相、第２相および第３相のいずれにも励磁突入電流は発生しなかった。
First, a demonstration test when the transformer is stopped will be described with reference to FIGS. 6 and 7.
In this demonstration test, the breaking operation of the three-phase collective circuit breaker is started at time t 1 when the power supply voltage shown in FIG. 6 (a) of the first phase of the three-phase transmission line is minimized (FIG. 7 (a)). See), the tip of the third circuit breaker movable contact 51 3 is fixed to the third circuit breaker at time t 2 when the power supply voltage of the third phase of the three-phase transmission line to be shut off early by 1/4 cycle becomes near the maximum. after away from the contact 52 3 (see FIG. 7 (b)), the circuit breaker movable contact 51 of the first and second time t 3 after the time t 2 1/4 cycles elapsed, 51 2 of the tip Are separated from the first and second circuit breaker fixed contacts 52 1 and 52 2 (see FIG. 7C).
In this demonstration test, as shown in FIGS. 7E to 7G, no magnetizing inrush current occurred in any of the first phase, the second phase, and the third phase of the three-phase transmission line.
次に、変圧器充電時の実証試験について、図８および図９を参照して説明する。
この実証試験では、３相送電線の第１相の図８の（ａ）に示す電源電圧が“０”付近になる時刻ｔ1において三相一括式遮断器の投入動作を開始させ（図９（ａ）参照）、１／４サイクルだけ早めに投入させる３相送電線の第１相および第２相の線間電圧が最大になる時刻ｔ2で第１および第２の遮断器可動接点５１1，５１2の先端が第１および第２の遮断器固定接点５２1，５２2にそれぞれ接触するようにしたのち（図９（ｂ）参照）、時刻ｔ2から１／４サイクル経過後の時刻ｔ3に第３の遮断器可動接点５１3の先端が第３の遮断器固定接点５２3に接触するようにした（図９（ｃ）参照）。
この実証試験では、図９の（ｅ）から（ｇ）に示すように、３相送電線の第１相、第２相および第３相のいずれにも励磁突入電流は発生しなかった。
Next, a demonstration test at the time of charging the transformer will be described with reference to FIGS.
In this demonstration test, the operation of turning on the three-phase batch type circuit breaker is started at time t 1 when the power supply voltage shown in FIG. 8A of the first phase of the three-phase transmission line becomes near “0” (FIG. 9). (Refer to (a)), the first and second circuit breaker movable contacts 51 at time t 2 when the first-phase and second-phase line voltages of the three-phase transmission line to be input earlier by ¼ cycle become maximum. 1, 51 2 of the tip after into contact respectively with the first and second circuit breaker fixed contact 52 1, 52 2 (see FIG. 9 (b)), from the time t 2 after 1/4 cycle has elapsed At time t 3 a third tip of the breaker movable contact 51 3 is in contact with the third circuit breaker fixed contact 52 3 (see FIG. 9 (c)).
In this demonstration test, as shown in FIGS. 9E to 9G, no magnetizing inrush current was generated in any of the first phase, the second phase, and the third phase of the three-phase transmission line.
次に、本発明の一実施例による三相一括式遮断器１０について、図１乃至図４を参照して説明する。
本実施例による三相一括式遮断器１０は、図１に示すように、３相送電線の第３相の主接点（以下、「第３の主接点」と称する。）を３相送電線の第１相および第２相の主接点（以下、「第１および第２の主接点」と称する。）よりも１／４サイクルだけ早めに遮断させるとともに第１および第２の主接点を第３の主接点よりも１／４サイクルだけ早めに投入させる主接点遮断／投入手段として機能する遮断器操作部１１、連結シャフト１２、第１乃至第３のカムプレート１３1〜１３3（第１乃至第３の溝１３ａ1〜１３ａ3がそれぞれ形成されている）、第１乃至第３のカムローラ１３ｂ1〜１３ｂ3、第１乃至第３のガイドローラ１３ｃ1〜１３ｃ3、第１乃至第３の連結具１４1〜１４3および操作制御部１５を遮断器操作機構が具備する点で、従来の三相一括式遮断器と異なる。
Next, a three-phase collective circuit breaker 10 according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the three-phase collective circuit breaker 10 according to the present embodiment has a third-phase main contact (hereinafter referred to as “third main contact”) of the three-phase transmission line as a three-phase transmission line. The first and second phase main contacts (hereinafter referred to as “first and second main contacts”) are cut off by 1/4 cycle earlier and the first and second main contacts are Circuit breaker operating section 11, connecting shaft 12, first to third cam plates 13 1 to 13 3 (first) to third groove 13a 1 ～13A 3 are formed), the first to third cam rollers 13b 1 13 b 3, the first to third guide rollers 13c 1 ～13C 3, first to third The circuit breaker operating mechanism includes the couplers 14 1 to 14 3 and the operation control unit 15. This is different from the conventional three-phase circuit breaker.
ここで、第１乃至第３のカムプレート１３1〜１３3は、連結シャフト１２に直列に接続されている。これにより、第１乃至第３のカムプレート１３1〜１３3は、連結シャフト１２が遮断器操作部１１によって上下方向（すなわち、第１乃至第３の主接点の第１乃至第３のシャフト３1〜３3の軸方向と垂直な方向）に移動されると、遮断器操作部１１から連結シャフト１２を通じて動力が伝達されて上下方向に移動可能とされている。 Here, the first to third cam plates 13 1 to 13 3 are connected to the connecting shaft 12 in series. As a result, the first to third cam plates 13 1 to 13 3 have the connecting shaft 12 moved in the vertical direction by the circuit breaker operating portion 11 (that is, the first to third shafts 3 of the first to third main contacts). Once moved to the 1-3 third axis direction perpendicular), the power through the connection shaft 12 from the circuit breaker operating unit 11 is movable in the vertical direction is transmitted.
第１乃至第３のカムプレート１３1〜１３3の第１乃至第３のシャフト３1〜３3と反対側の側面（以下、「第１の側面」と称する。）には、第１乃至第３のガイドローラ１３ｃ1〜１３ｃ3が第１乃至第３のカムプレート１３1〜１３3の第１の側面と接触するように１個ずつそれぞれ取り付けられている。また、第１乃至第３のカムプレート１３1〜１３3の第１の側面と互いに対向する側面（以下、「第３の側面」と称する。）には、第１乃至第３のカムプレート１３1〜１３3の第３の側面と接触するように第１乃至第３のガイドローラ１３ｃ1〜１３ｃ3が２個ずつそれぞれ取り付けられている。 The first to third cam plates 13 1 to 13 3 have first to third shafts 1 1 to 3 3 opposite to the first to third shafts 3 1 to 3 3 (hereinafter referred to as “first side surfaces”). The third guide rollers 13c 1 to 13c 3 are attached one by one so as to come into contact with the first side surfaces of the first to third cam plates 13 1 to 13 3 . Further, the first to third cam plates 13 are provided on the side surfaces (hereinafter referred to as “third side surfaces”) opposite to the first side surfaces of the first to third cam plates 13 1 to 13 3 . Two each of first to third guide rollers 13c 1 to 13c 3 are attached so as to be in contact with the third side surfaces 1 to 13 3 .
第１乃至第３のカムプレート１３1〜１３3の第１および第３の側面以外の側面（以下、「第２および第４の側面」と称する。）には、第２の側面から第４の側面まで貫通する「く」の字状の第１乃至第３の溝１３ａ1〜１３ａ3がそれぞれ形成されている。また、第１乃至第３の溝１３ａ1〜１３ａ3内には、連結シャフト１２が遮断器操作機構１１によって上下方向に移動されると第１乃至第３の溝１３ａ1〜１３ａ3に沿って位置が上下方向にそれぞれ移る第１乃至第３のカムローラ１３ｂ1〜１３ｂ3がそれぞれ設けられている。 Side surfaces (hereinafter referred to as “second and fourth side surfaces”) of the first to third cam plates 13 1 to 13 3 other than the first and third side surfaces are referred to as “second and fourth side surfaces” from the second side surface to the fourth side surface. The first to third grooves 13a 1 to 13a 3 are formed so as to penetrate to the side surface. Further, in the first to third groove 13a 1 ～13A 3, the connecting shaft 12 along the groove 13a 1 ～13A 3 is as the first to third movable in the vertical direction by the circuit breaker operating mechanism 11 position is the first to third cam rollers 13b 1 13 b 3 moves respectively in the vertical direction are provided.
第１乃至第３のカムローラ１３ｂ1〜１３ｂ3は第１乃至第３の連結具１４1〜１４3を介して第１乃至第３のシャフト３1〜３3とそれぞれ連結されている。
第１乃至第３の連結具１４1〜１４3は、第１乃至第３のカムプレート１３1〜１３3の第３の側面とそれぞれ接触する２個ずつの第１乃至第３のガイドローラ１３ｃ1〜１３ｃ3に挟まれるようにそれぞれ設けられている。
The first to third cam rollers 13b 1 13 b 3 are connected respectively to the first to third shaft 3 1 to 3 3 through the first to third connector 14 1-14 3.
The first to third couplers 14 1 to 14 3 are respectively provided with two first to third guide rollers 13c that come into contact with the third side surfaces of the first to third cam plates 13 1 to 133, respectively. It is provided so as to be sandwiched 1 ~13c 3.
第１および第２の溝１３ａ1，１３ａ2は、第１および第２のカムプレート１３1，１３2の下端（すなわち、遮断器操作部１１側の端）付近から上方（すなわち、遮断器操作部１１と反対側）に直線的に延びた第１および第２の直線部と、第１および第２の直線部の上端から第１および第２のカムプレート１３1，１３2の第１の側面に向かって斜め上方に直線的に延びた第１および第２の斜線部とからなる。これに対して、第３の溝１３ａ3は、第３のカムプレート１３2の下端付近から第３のカムプレート１３3の第１の側面に向かって斜め上方に直線的に延びた第３の斜線部と、第３の斜線部の上端から上方に直線的に延びた第３の直線部とからなる。 The first and second grooves 13a 1 , 13a 2 are located above the lower ends of the first and second cam plates 13 1 , 13 2 (that is, the end on the circuit breaker operating portion 11 side) and above (that is, the circuit breaker is operated). First and second linear portions extending linearly to the opposite side of the portion 11, and the first and second cam plates 13 1 , 13 2 from the upper ends of the first and second linear portions. It consists of the 1st and 2nd oblique line part extended linearly diagonally upward toward the side surface. In contrast, the third groove 13a 3 of the third linearly extending obliquely upward toward the third cam plate 13 and second bottom around the third of the first side of the cam plate 13 3 It consists of a hatched portion and a third straight portion extending linearly upward from the upper end of the third shaded portion.
第１乃至第３の溝１３ａ1〜１３ａ3の上下方向の長さ（すなわち、連結シャフト１２の軸方向に沿った長さ）は同じにされており、第１乃至第３の溝１３ａ1〜１３ａ3の第１乃至第３の直線部の上下方向の長さと第１乃至第３の溝１３ａ1〜１３ａ3の第１乃至第３の斜線部の上下方向の長さとは同じにされている。 The first to third grooves 13a 1 to 13a 3 have the same vertical length (ie, the length along the axial direction of the connecting shaft 12), and the first to third grooves 13a 1 to 13a 1 The vertical length of the first to third linear portions 13a 3 and the vertical length of the first to third hatched portions of the first to third grooves 13a 1 to 13a 3 are the same. .
また、第１および第２の溝１３ａ1，１３ａ2の第１および第２の直線部の上下方向の長さと第３の溝１３ａ3の第３の斜線部の上下方向の長さとは、第３のガイドローラ１３ｂ3の位置が第３の斜線部の下端から上端まで移ると、第３のガイドローラ１３ｂ3と第３の連結具１４ｂ3を介して連結された第３のシャフト３3が第３の溝１３ａ3の第３の斜線部の左右方向の長さ（すなわち、連結シャフト１２の軸方向と垂直な方向に沿った長さ）分だけ左方向（すなわち、第３のカムプレート１３3側）に移動することにより第３の遮断器可動接点１3が第３の遮断器固定接点２3から完全に離れる（すなわち、第３の主接点が遮断される）長さとされている。 The vertical lengths of the first and second straight portions of the first and second grooves 13a 1 and 13a 2 and the vertical length of the third hatched portion of the third groove 13a 3 are defined as follows. When the position of the third guide roller 13b 3 moves to the upper end from the lower end of the third shaded area, the third guide roller 13b 3 and the third third shaft 3 3 connected through the connector 14b 3 of The left direction (that is, the third cam plate 13) by the length in the left-right direction of the third oblique line portion of the third groove 13a 3 (that is, the length along the direction perpendicular to the axial direction of the connecting shaft 12). by moving the 3 side) the third circuit breaker movable contact 1 3 completely away from the third circuit breaker fixed contact 2 3 (i.e., a third main contact is with to) a length cut off.
さらに、第１および第２の溝１３ａ1，１３ａ2の第１および第２の斜線部の上下方向の長さと第３の溝１３ａ3の第３の直線部の上下方向の長さとは、第１および第２のガイドローラ１３ｂ1，１３ｂ2の位置が第１および第２の斜線部の上端から下端までそれぞれ移ると、第１および第２のガイドローラ１３ｂ1，１３ｂ2と第１および第２の連結具１４ｂ1，１４ｂ2を介してそれぞれ連結された第１および第２のシャフト３1，３2が第１および第２の溝１３ａ1，１３ａ2の第１および第２の斜線部の左右方向の長さ分だけ右方向（すなわち、第１および第２のカムプレート１３1，１３2と反対側）にそれぞれ移動することにより第１および第２の遮断器可動接点１1，１2が第１および第２の遮断器固定接点２1，２2に完全にそれぞれ接触する（すなわち、第１および第２の主接点が投入される）長さとされている。 Further, the vertical lengths of the first and second hatched portions of the first and second grooves 13a 1 and 13a 2 and the vertical length of the third straight portion of the third groove 13a 3 are: When the positions of the first and second guide rollers 13b 1 and 13b 2 move from the upper end to the lower end of the first and second hatched portions, respectively, the first and second guide rollers 13b 1 and 13b 2 and the first and second guide rollers 13b 1 and 13b 2 move. The first and second shafts 3 1 , 3 2 connected via two connecting tools 14 b 1 , 14 b 2 respectively are the first and second hatched portions of the first and second grooves 13 a 1 , 13 a 2 . The first and second circuit breaker movable contacts 1 1 , 1 are moved rightward by the length in the left-right direction (that is, opposite to the first and second cam plates 13 1 , 13 2 ), respectively. 2 the first and second circuit breaker fixed contact 2 1, 2 2 completely it Are in contact there is a (i.e., first and second main contact is being turned) in length.
さらにまた、遮断器操作部１１によって連結シャフト１２を下方に移動する速さは、第１乃至第３のガイドローラ１３ｂ1〜１３ｂ3の位置が第１乃至第３の溝１３ａ1〜１３ａ3の下端から上端にそれぞれ移る間に第３の遮断器可動接点１3の先端が第３の遮断器固定接点２3から離れてから１／４サイクル経過後に第１および第２の遮断器可動接点１1，１2の先端が第１および第２の遮断器固定接点２1，２2からそれぞれ離れるように設定されている。
同様に、遮断器操作部１１によって連結シャフト１２を上方に移動する速さは、第１乃至第３のガイドローラ１３ｂ1〜１３ｂ3の位置が第１乃至第３の溝１３ａ1〜１３ａ3の上端から下端にそれぞれ移る間に第１および第２の遮断器可動接点１1，１2の先端が第１および第２の遮断器固定接点２1，２2にそれぞれ接触してから１／４サイクル経過後に第３の遮断器可動接点１3の先端が第３の遮断器固定接点２3に接触するように設定されている。
Furthermore, the speed at which the connecting shaft 12 is moved downward by the circuit breaker operation unit 11 is such that the positions of the first to third guide rollers 13b 1 to 13b 3 are the positions of the first to third grooves 13a 1 to 13a 3 . the third circuit breaker movable contact 1 3 of the tip is the third circuit breaker fixed contact 2 after 1/4 cycles elapsed since away from 3 first and second circuit breaker movable contact while moving each of the upper end from the lower end 1 1, 1 2 of the tip is set away from the first and second circuit breaker fixed contact 2 1, 2 2.
Similarly, the speed at which the connecting shaft 12 is moved upward by the circuit breaker operation unit 11 is such that the positions of the first to third guide rollers 13b 1 to 13b 3 are the positions of the first to third grooves 13a 1 to 13a 3 . 1/4 after the tips of the first and second circuit breaker movable contacts 1 1 and 1 2 contact the first and second circuit breaker fixed contacts 2 1 and 2 2 , respectively, while moving from the upper end to the lower end, respectively. the third tip of breaker movable contact 1 3 is configured to contact the third circuit breaker fixed contact 2 3 after cycles elapse.
操作制御部１５は、外部から変圧器停止信号または変圧器充電信号が入力されると、３相送電線の第１相、第２相および第３相にそれぞれ設置された第１乃至第３の計器用変圧器（不図示）からそれぞれ入力される３相送電線の第１相、第２相および第３相の電圧（以下、「第１乃至第３の相電圧Ｖ1〜Ｖ3」と称する。）に基づいて、以下のようにして遮断指令信号または投入指令信号を生成して、生成した遮断指令信号または投入指令信号を遮断器操作部１１に出力する。
（１）変圧器停止時には、第３の相電圧Ｖ3が最大となるタイミングで第３の主接点を遮断する（すなわち、第３の遮断器可動接点１3の先端が第３の遮断器固定接点２3から離れる）ように連結シャフト１２を下方に移動させるように指示する遮断指令信号を生成する。
（２）変圧器充電時には、第１および第２の相電圧Ｖ1，Ｖ2の差電圧（すなわち、３相送電線の第１相および第２相間の線間電圧）が最大となるタイミングで第１および第２の遮断部を投入する（すなわち、第１および第２の遮断器可動接点１1，１2の先端が第１および第２の遮断器固定接点２1，２2に接触する）ように連結シャフト１２を上方に移動させるように指示する投入指令信号を生成する。
When a transformer stop signal or a transformer charging signal is input from the outside, the operation control unit 15 is provided with first to third phases respectively installed in the first phase, the second phase, and the third phase of the three-phase transmission line. First-phase, second-phase and third-phase voltages (hereinafter referred to as “first to third phase voltages V 1 to V 3 ”) of a three-phase transmission line respectively input from an instrument transformer (not shown) Based on the above, the interrupt command signal or the input command signal is generated as follows, and the generated interrupt command signal or the input command signal is output to the circuit breaker operation unit 11.
(1) When a transformer is stopped, the third phase voltage V 3 blocks the third main contact at the timing when the maximum (i.e., the third tip of the breaker movable contact 1 3 of the third circuit breakers fixed generating a cutoff command signal instructing to move the contact 2 away from the 3) as the coupling shaft 12 downward.
(2) At the time of charging the transformer, the timing at which the differential voltage between the first and second phase voltages V 1 and V 2 (that is, the line voltage between the first phase and the second phase of the three-phase transmission line) is maximized. Insert the first and second circuit breakers (that is, the tips of the first and second circuit breaker movable contacts 1 1 and 1 2 are in contact with the first and second circuit breaker fixed contacts 2 1 and 2 2 ). ) To generate an input command signal for instructing to move the connecting shaft 12 upward.
次に、本実施例による三相一括式遮断器１０の変圧器停止時の動作について、図１乃至図４を参照して説明する。
なお、変圧器停止前においては、第１乃至第３のカムプレート１３1〜１３3の位置は、図１に示すように、第１乃至第３の溝１３ａ1〜１３ａ3の下端とされている。
Next, the operation | movement at the time of the transformer stop of the three-phase collective circuit breaker 10 by a present Example is demonstrated with reference to FIG.
Before the transformer stops, the positions of the first to third cam plates 13 1 to 13 3 are the lower ends of the first to third grooves 13a 1 to 13a 3 as shown in FIG. Yes.
操作制御部１５は、外部から変圧器停止信号が入力されると、遮断指令信号を生成して、生成した遮断指令信号を遮断器操作部１１に出力する。
遮断器操作部１１は、遮断指令信号が操作制御部１５から入力されると、連結シャフト１２を下方に移動させる。その結果、第１乃至第３のカムプレート１３1〜１３3も下方に移動する。
When the transformer stop signal is input from the outside, the operation control unit 15 generates a break command signal and outputs the generated break command signal to the breaker operation unit 11.
When the breaker command signal is input from the operation control unit 15, the breaker operation unit 11 moves the connecting shaft 12 downward. As a result, the first to third cam plates 13 1 to 13 3 also move downward.
第１乃至第３のカムプレート１３1〜１３3が下方に移動するに従って第３のカムローラ１３ｂ3の位置は第３の溝１３ａ3の第３の斜線部に沿って上方に移っていくので、第３の遮断器可動接点１3が第３の遮断器固定接点２3から離れる方向に移動して、第３の遮断器可動接点１3の先端が第３の遮断器固定接点２3から離れる（図２参照）。その後、第３の遮断器可動接点１3と第３の遮断器固定接点２3とが完全に離れる。
一方、第１および第２のカムローラ１３ｂ1，１３ｂ2の位置は第１および第２の溝１３ａ1，１３ａ2の第１および第２の直線部に沿って上方にそれぞれ移っていくだけであるので、第１および第２の遮断器可動接点１1，１2は移動せずに第１および第２の遮断器固定接点２1，２2と完全に接触したままとなる（図２参照）。
As the first to third cam plates 13 1 to 13 3 move downward, the position of the third cam roller 13b 3 moves upward along the third oblique line portion of the third groove 13a 3 . The third circuit breaker movable contact 1 3 moves away from the third circuit breaker fixed contact 2 3, and the tip of the third circuit breaker movable contact 1 3 moves away from the third circuit breaker fixed contact 2 3. (See FIG. 2). Thereafter, the third circuit breaker movable contact 1 3 and the third circuit breaker fixed contact 2 3 are completely separated.
On the other hand, the positions of the first and second cam rollers 13b 1 and 13b 2 only move upward along the first and second linear portions of the first and second grooves 13a 1 and 13a 2 , respectively. The first and second circuit breaker movable contacts 1 1 and 1 2 do not move and remain in full contact with the first and second circuit breaker fixed contacts 2 1 and 2 2 (see FIG. 2).
第１乃至第３のカムプレート１３1〜１３3が下方に更に移動すると、第１および第２のカムローラ１３ｂ1，１３ｂ2の位置が第１および第２の溝１３ａ1，１３ａ2の第１および第２の斜線部に沿って上方にそれぞれ移っていくことにより、第１および第２の遮断器可動接点１1，１2が第１および第２の遮断器固定接点２1，２2から離れる方向にそれぞれ移動して、第３の遮断器可動接点１3の先端が第３の遮断器固定接点２3から離れてから１／４サイクル経過後に、第１および第２の遮断器可動接点１1，１2の先端が第１および第２の遮断器固定接点２1，２2からそれぞれ離れる（図３参照）。その後、第１および第２の遮断器可動接点１1，１2と第１および第２の遮断器固定接点２1，２2とは完全に離れる（図４参照）。
一方、第３のカムローラ１３ｂ3の位置は第３の溝１３ａ3の第３の直線部に沿って上方に移っていくだけであるので、第３の遮断器可動接点１3は移動せずに第３の遮断器固定接点２３から完全に離れたままとなる。
When the first to third cam plates 13 1 to 13 3 are further moved downward, the positions of the first and second cam rollers 13b 1 and 13b 2 are changed to the positions of the first and second grooves 13a 1 and 13a 2 . The first and second circuit breaker movable contacts 1 1 and 1 2 are moved from the first and second circuit breaker fixed contacts 2 1 and 2 2 respectively by moving upward along the second shaded portion. move each away, the third tip of the breaker movable contact 1 3 of after 1/4 cycles elapsed since away from the third circuit breaker fixed contact 2 3, the first and second circuit breaker movable contact The tips of 1 1 and 1 2 are separated from the first and second circuit breaker fixed contacts 2 1 and 2 2 , respectively (see FIG. 3). Thereafter, the first and second circuit breaker movable contacts 1 1 and 1 2 are completely separated from the first and second circuit breaker fixed contacts 2 1 and 2 2 (see FIG. 4).
On the other hand, since the position of the third cam rollers 13b 3 is only gradually moved upwards along the third linear portion of the third groove 13a 3, a third circuit breaker movable contact 1 3 of the without moving 3 remains completely away from the circuit breaker fixed contact 2 3 .
次に、本実施例による三相一括式遮断器の変圧器充電時の動作について説明する。
なお、変圧器受電前においては、第１乃至第３のカムプレート１３1〜１３3の位置は、図４に示すように、第１乃至第３の溝１３ａ1〜１３ａ3の上端とされている。
Next, the operation | movement at the time of the transformer charge of the three-phase collective circuit breaker by a present Example is demonstrated.
Before receiving the transformer power, the positions of the first to third cam plates 13 1 to 13 3 are the upper ends of the first to third grooves 13a 1 to 13a 3 as shown in FIG. Yes.
操作制御部１５は、外部から変圧器充電信号が入力されると、投入指令信号を生成して、生成した投入指令信号を遮断器操作部１１に出力する。
遮断器操作部１１は、投入指令信号が操作制御部１５から入力されると、連結シャフト１２を上方に移動させる。その結果、第１乃至第３のカムプレート１３1〜１３3も上方に向かって移動する。
When a transformer charging signal is input from the outside, the operation control unit 15 generates a closing command signal and outputs the generated charging command signal to the circuit breaker operating unit 11.
When the closing command signal is input from the operation control unit 15, the circuit breaker operation unit 11 moves the connecting shaft 12 upward. As a result, the first to third cam plates 13 1 to 13 3 also move upward.
第１乃至第３のカムプレート１３1〜１３3が上方に移動するに従って第１および第２のカムローラ１３ｂ1，１３ｂ2の位置が第１および第２の溝１３ａ1，１３ａ2の第１および第２の斜線部に沿って下方にそれぞれ移っていくことにより、第１および第２の遮断器可動接点１1，１2が第１および第２の遮断器固定接点２1，２2に近付く方向にそれぞれ移動して、第１および第２の遮断器可動接点１1，１2の先端が第１および第２の遮断器固定接点２1，２2とそれぞれ接触する（図３参照）。その後、第１および第２の遮断器可動接点１1，１2と第１および第２の遮断器固定接点２1，２2とが完全にそれぞれ接触する。
一方、第３のカムローラ１３ｂ3の位置は第３の溝１３ａ3の第３の直線部に沿って下方に移っていくだけであるので、第３の遮断器可動接点１3は移動せずに第３の遮断器固定接点２３から完全に離れたままとなる。
As the first to third cam plates 13 1 to 13 3 move upward, the positions of the first and second cam rollers 13b 1 and 13b 2 change to the first and second grooves 13a 1 and 13a 2 . The first and second circuit breaker movable contacts 1 1 and 1 2 approach the first and second circuit breaker fixed contacts 2 1 and 2 2 by moving downward along the second shaded portion. The first and second circuit breaker movable contacts 1 1 and 1 2 are respectively brought into contact with the first and second circuit breaker fixed contacts 2 1 and 2 2 (see FIG. 3). Thereafter, the first and second circuit breaker movable contacts 1 1 , 1 2 and the first and second circuit breaker fixed contacts 2 1 , 2 2 are completely in contact with each other.
On the other hand, since the position of the third cam rollers 13b 3 is only gradually moved downward along the third linear portion of the third groove 13a 3, a third circuit breaker movable contact 1 3 of the without moving 3 remains completely away from the circuit breaker fixed contact 2 3 .
第１乃至第３のカムプレート１３1〜１３3が上方に更に移動すると、第３のカムローラ１３ｂ3の位置が第３の溝１３ａ3の第３の斜線部に沿って下方に移っていくことにより、第３の遮断器可動接点１3が第３の遮断器固定接点２3に近付く方向に移動して、第１および第２の遮断器可動接点１1，１2の先端が第１および第２の遮断器固定接点２1，２2と接触してから１／４サイクル経過後に、第３の遮断器可動接点１3の先端が第３の遮断器固定接点２3と接触する（図２参照）。その後、第３の遮断器可動接点１3と第３の遮断器固定接点２3とが完全に接触する（図１参照）。
一方、第１および第２のカムローラ１３ｂ1，１３ｂ2の位置は第１および第２の溝１３ａ1，１３ａ2の第１および第２の直線部に沿って下方にそれぞれ移っていくだけであるので、第１および第２の遮断器可動接点１1，１2は移動せずに第１および第２の遮断器固定接点２1，２2と完全に接触したままとなる。
When the first to third cam plates 13 1 to 13 3 further move upward, the position of the third cam roller 13b 3 moves downward along the third hatched portion of the third groove 13a 3 . , the third circuit breaker movable contact 1 3 is moved toward the third circuit breaker fixed contact 2 3, the first and second circuit breaker movable contact 1 1, 1 2 of the tip first and after 1/4 cycles elapsed since contact with the second circuit breaker fixed contact 2 1, 2 2, a third tip of the breaker movable contact 1 3 is in contact with the third circuit breaker fixed contact 2 3 (Figure 2). Thereafter, a third circuit breaker movable contact 1 3 of the third circuit breaker fixed contact 2 3 of full contact (see FIG. 1).
On the other hand, the positions of the first and second cam rollers 13b 1 and 13b 2 only move downward along the first and second straight portions of the first and second grooves 13a 1 and 13a 2 , respectively. The first and second circuit breaker movable contacts 1 1 and 1 2 do not move and remain in complete contact with the first and second circuit breaker fixed contacts 2 1 and 2 2 .
なお、本発明による三相一括式遮断器は、中性点が直接接地されていない変圧器用に限定されるが、中性点にリアクトルや抵抗が設置されている変圧器で変圧器保護継電器として地絡過電流継電器が用いられている場合には、誤動作の恐れがあるため、変圧器充電時の継電器一時ロック回路を設ける必要がある。 In addition, the three-phase collective circuit breaker according to the present invention is limited to a transformer whose neutral point is not directly grounded, but as a transformer protective relay in a transformer in which a reactor or resistor is installed at the neutral point. When a ground fault overcurrent relay is used, there is a risk of malfunction, so it is necessary to provide a relay temporary lock circuit during charging of the transformer.
また、遮断器の電流遮断は電流が“０”になる付近で実際の遮断となるが、本発明による三相一括式遮断器は、電流が“０”付近で三相一括式遮断器が開離するよう制御されるので、理想的な遮断となる。その結果、アーク接触子の消耗も少なくなるので、三相一括式遮断器の点検頻度の低減や延命化も図ることができる。 In addition, the circuit breaker's current interruption actually breaks when the current becomes “0”, but the three-phase collective circuit breaker according to the present invention opens the three-phase collective circuit breaker when the current is “0”. Since it is controlled to be separated, it is an ideal cutoff. As a result, the arc contact is also less consumed, so the inspection frequency of the three-phase batch type circuit breaker can be reduced and the life can be extended.
さらに、本発明による三相一括式遮断器では、事故時には位相制御されず通常遮断となるが、アーク消弧性能は通常の遮断器と大きな違いがないので、必要な事故遮断が可能である。 Furthermore, in the three-phase collective circuit breaker according to the present invention, the phase is not controlled in the event of an accident and the normal circuit breaker is performed. However, since the arc extinguishing performance is not significantly different from that of a normal circuit breaker, necessary accident circuit breaks are possible.
１1〜１3，５１1〜５１3 第１乃至第３の遮断器可動接点
２1〜２3，５２1〜５２3 第１乃至第３の遮断器固定接点
３1〜３3 第１乃至第３のシャフト
１０ 三相一括式遮断器
１１ 遮断器操作部
１２ 連結シャフト
１３1〜１３3 第１乃至第３のカムプレート
１３ａ1〜１３ａ3 第１乃至第３の溝
１３ｂ1〜１３ｂ3 第１乃至第３のカムローラ
１３ｃ1〜１３ｃ3 第１乃至第３のガイドローラ
１４1〜１４3 第１乃至第３の連結具
１５ 操作制御部
Ｖ1〜Ｖ3 第１乃至第３の相電圧
ｔ1〜ｔ3 時刻
1 1 to 1 3, 51 1 to 51 3 first to third circuit breaker movable contact 2 1 to 2 3, 52 1-52 3 first to third breaker fixed contact 3 1 to 3 3 first to the Third shaft 10 Three-phase collective circuit breaker 11 Circuit breaker operation unit 12 Connection shaft 13 1 to 13 3 First to third cam plates 13a 1 to 13a 3 First to third grooves 13b 1 to 13b 3 1st to 3rd cam rollers 13c 1 to 13c 3 1st to 3rd guide rollers 14 1 to 14 3 1st to 3rd coupler 15 Operation control units V 1 to V 3 1st to 3rd phase voltage t 1 ~t 3 time
Claims (5)
前記遮断器操作機構が、前記３つの主接点のうちの１つの主接点を他の２つの主接点よりも１／４サイクルだけ早めに遮断させるとともに、該１つの主接点を該他の２つの主接点よりも１／４サイクルだけ遅めに投入させる主接点遮断／投入手段を具備し、
前記主接点遮断／投入手段が、３相送電線の前記１つの主接点に対応する相の電圧が最大になるタイミングで該１つの主接点を遮断させるとともに、該３相送電線の前記他の２つの主接点に対応する他の２つの相の線間電圧が最大になるタイミングで該他の２つの主接点を投入させ、
前記主接点遮断／投入手段が、
遮断器操作部（１１）と、
該遮断器操作部によって上下方向に移動される連結シャフト（１２）と、
該連結シャフトに直列に接続された、かつ、第１乃至第３の溝（１３ａ 1 〜１３ａ 3 ）がそれぞれ形成された第１乃至第３のカムプレート（１３ 1 〜１３ 3 ）と、
第１乃至第３の連結具（１４ 1 〜１４ 3 ）と、
該第１乃至第３の連結具を介して前記３つの主接点の第１乃至第３のシャフト（３ 1 〜３ 3 ）とそれぞれ連結された、かつ、前記連結シャフトが前記遮断器操作部によって上下方向に移動されると位置が前記第１乃至第３の溝に沿ってそれぞれ移る第１乃至第３のカムローラ（１３ｂ 1 〜１３ｂ 3 ）とを具備し、
前記第１および第２の溝が、前記第１および第２のカムプレートの下端付近から上方に直線的に延びた第１および第２の直線部と、該第１および第２の直線部の上端から斜め上方に直線的に延びた第１および第２の斜線部とからなり、
前記第３の溝が、前記第３のカムプレートの下端付近から前記斜め上方に直線的に延びた第３の斜線部と、該第３の斜線部の上端から上方に直線的に延びた第３の直線部とからなる、
ことを特徴とする、三相一括式遮断器。 A three-phase collective circuit breaker (10) that simultaneously operates and breaks off three main contacts with one circuit breaker operating mechanism,
The circuit breaker operating mechanism shuts off one main contact of the three main contacts by 1/4 cycle earlier than the other two main contacts, and connects the one main contact to the other two main contacts. It has a main contact cut-off / release means that is turned on by 1/4 cycle later than the main contact,
The main contact breaking / closing means shuts off the one main contact at a timing when the voltage of the phase corresponding to the one main contact of the three-phase transmission line becomes maximum, and the other of the three-phase transmission line The other two main contacts are turned on when the line voltage of the other two phases corresponding to the two main contacts becomes maximum ,
The main contact breaking / closing means is
A circuit breaker operation section (11);
A connecting shaft (12) moved up and down by the circuit breaker operating section;
Connected in series to the connecting shaft, and the first to third cam plate first to third grooves (13a 1 ～13A 3) are formed respectively (131-134 3),
First to third connectors (14 1 to 14 3 );
The first to third shafts (3 1 to 3 3 ) of the three main contacts are connected to the first to third shafts via the first to third connectors, respectively. First to third cam rollers (13b 1 to 13b 3 ) whose positions move along the first to third grooves when moved in the vertical direction ,
The first and second grooves include first and second straight portions extending linearly upward from near lower ends of the first and second cam plates, and the first and second straight portions. The first and second oblique line portions that linearly extend obliquely upward from the upper end,
The third groove has a third diagonal line portion extending linearly upward from the vicinity of the lower end of the third cam plate, and a third linear line portion extending linearly upward from the upper end of the third diagonal line portion. Consisting of 3 straight sections,
A three-phase collective circuit breaker characterized by
前記第１乃至第３の溝の前記第１乃至第３の直線部の上下方向の長さと該第１乃至第３の溝の前記第１乃至第３の斜線部の上下方向の長さとが同じにされている、
ことを特徴とする、請求項１記載の三相一括式遮断器。 The vertical lengths of the first to third grooves are the same,
The vertical length of the first to third straight portions of the first to third grooves is the same as the vertical length of the first to third hatched portions of the first to third grooves. I have been in,
The three-phase collective circuit breaker according to claim 1, wherein:
前記第１および第２の溝の前記第１および第２の斜線部の上下方向の長さと前記第３の溝の前記第３の直線部の上下方向の長さとが、前記第１および第２のガイドローラの位置が該第１および第２の斜線部の上端から下端までそれぞれ移ると、該第１および第２のガイドローラと前記第１および第２の連結具を介してそれぞれ連結された前記第１および第２のシャフトが該第１および第２の斜線部の左右方向の長さ分だけ該左右方向の他方の方向にそれぞれ移動することにより前記他の２つの主接点が投入される長さとされている、
ことを特徴とする、請求項２記載の三相一括式遮断器。 The length of the first and second straight portions of the first and second grooves in the vertical direction and the length of the third hatched portion of the third groove in the vertical direction are the third guide rollers. Is moved from the lower end to the upper end of the third hatched portion, the third shaft connected to the third guide roller via the third connector is moved to the left and right of the third hatched portion. The one main contact is cut off by moving in one of the left and right directions by the length of the direction,
The vertical lengths of the first and second hatched portions of the first and second grooves and the vertical length of the third linear portion of the third groove are the first and second lengths. When the position of the first guide roller is shifted from the upper end to the lower end of the first and second hatched portions, the first and second guide rollers are connected to the first and second connection tools, respectively. The other two main contacts are inserted by moving the first and second shafts in the left-right direction by the length of the first and second hatched portions in the left-right direction, respectively. Length
The three-phase collective circuit breaker according to claim 2, wherein:
前記遮断器操作部によって前記連結シャフトを上方に移動する速さが、前記第１乃至第３のガイドローラの位置が前記第１乃至第３の溝の上端から下端にそれぞれ移る間に前記他の２つの主接点が投入されてから１／４サイクル経過後に前記１つの主接点が投入されるように設定されている、
ことを特徴とする、請求項１乃至３いずれかに記載の三相一括式遮断器。 The speed at which the connection shaft is moved downward by the circuit breaker operating unit is such that the position of the first to third guide rollers moves from the lower end to the upper end of the first to third grooves, respectively. The other two main contacts are set to be shut off after ¼ cycle has elapsed since the main contact was cut off,
The speed at which the connection shaft is moved upward by the circuit breaker operating unit is determined while the position of the first to third guide rollers is shifted from the upper end to the lower end of the first to third grooves, respectively. The one main contact is set to be turned on after ¼ cycle has elapsed since the two main contacts were turned on,
The three-phase collective circuit breaker according to any one of claims 1 to 3, wherein
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| JPS5549822A (en) * | 1978-10-03 | 1980-04-10 | Mitsubishi Electric Corp | Switching device |
| JPS5685323U (en) * | 1979-12-05 | 1981-07-09 | ||
| JPS58102423A (en) * | 1981-12-11 | 1983-06-18 | 株式会社日立製作所 | Power breaker |
| JPS6271128A (en) * | 1985-09-25 | 1987-04-01 | 株式会社明電舎 | Vacuum switch |
| JPH0419930A (en) * | 1990-05-14 | 1992-01-23 | Toshiba Corp | Operation system of vacuum circuit breaker |
| JP2818262B2 (en) * | 1990-06-27 | 1998-10-30 | 株式会社東芝 | Vacuum circuit breaker |
| JPH0652759A (en) * | 1992-07-31 | 1994-02-25 | Toshiba Corp | Non-effectively earthed system opening phase control device |
| JPH09147698A (en) * | 1995-11-27 | 1997-06-06 | Mitsubishi Electric Corp | Switch device |
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| JP2006012759A (en) * | 2004-06-29 | 2006-01-12 | Oaks:Kk | Device to suppress rush current of transformer |
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