JP2000066739A - Voltage adjustment device - Google Patents
Voltage adjustment deviceInfo
- Publication number
- JP2000066739A JP2000066739A JP10237886A JP23788698A JP2000066739A JP 2000066739 A JP2000066739 A JP 2000066739A JP 10237886 A JP10237886 A JP 10237886A JP 23788698 A JP23788698 A JP 23788698A JP 2000066739 A JP2000066739 A JP 2000066739A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transformer
- secondary winding
- current
- tap
- 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.)
- Granted
Links
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は配電線や負荷の電源
線に設けられる電圧調整装置の改良に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a voltage regulator provided on a power line of a distribution line or a load.
【０００２】[0002]
【従来の技術】一般に配電線などの電源線には、負荷の
増大による電圧降下や、負荷を切離した後、残ったコン
デンサによる電圧上昇などの電圧変動に対応するため電
源線の途中に電圧調整装置が設けられている。2. Description of the Related Art Generally, a power supply line such as a distribution line has a voltage adjustment in the middle of the power supply line in order to cope with a voltage drop due to an increase in a load or a voltage change such as a voltage increase due to a remaining capacitor after the load is disconnected. A device is provided.
【０００３】従来の電圧調整装置３（１相分）は、図３
に示すように電源線１、２の間に設けられている。電圧
調整装置３の構成は電源線１に直列的に直列変圧器４が
接続され、また電源線１、２間に並列的に励磁変圧器５
が接続されている。励磁変圧器５の二次巻線５ｂはタッ
プＡ、Ｂ、Ｃが設けられ、この端子と前記直列変圧器４
の二次巻線４ｂとは、それぞれ交流スイッチ１１、１
２、１３、１４、１５、１６を介して接続され、これら
の交流スイッチ１１〜１６は、逆並列接続された逆阻止
３端子型サイリスタが用いられている。A conventional voltage regulator 3 (for one phase) is shown in FIG.
Are provided between the power supply lines 1 and 2 as shown in FIG. The voltage regulator 3 has a configuration in which a series transformer 4 is connected in series to a power line 1, and an exciting transformer 5 is connected in parallel between the power lines 1 and 2.
Is connected. The secondary winding 5b of the exciting transformer 5 is provided with taps A, B, and C.
And the secondary winding 4b of the AC switch 11, 1
2, 13, 14, 15, and 16, and these AC switches 11 to 16 use reverse-blocking three-terminal thyristors connected in anti-parallel.
【０００４】またこれら交流スイッチ１１〜１６と並列
に、抵抗器７と交流スイッチ１７とで構成されたバイパ
ス回路６が接続されている。８は直列変圧器４の二次巻
線４ｂに直列に接続された限流リアクトルである。また
９は検出用変圧器で、これは制御装置１０に接続されて
いる。この制御装置１０は、前記検出用変圧器９に接続
された電圧検出部２０、基準電圧部２１、これらに接続
された電圧比較器２２、およびタイマを内蔵したタップ
選択器２３とから構成されている。[0004] A bypass circuit 6 composed of a resistor 7 and an AC switch 17 is connected in parallel with the AC switches 11 to 16. Reference numeral 8 denotes a current limiting reactor connected in series to the secondary winding 4b of the series transformer 4. Reference numeral 9 denotes a detection transformer, which is connected to the control device 10. The control device 10 includes a voltage detection unit 20, a reference voltage unit 21, a voltage comparator 22 connected thereto, and a tap selector 23 having a built-in timer connected to the detection transformer 9. I have.
【０００５】この電圧調整装置３において、電源線１、
２間の電圧を６．６ｋＶ、直列変圧器４の一次側と二次
側の巻数比を１、励磁変圧器５の二次巻線５ｂのタップ
ＡＢ間電圧１００Ｖ、タップＢＣ間電圧を２００Ｖとす
る。この状態で電圧を上げる場合には、交流スイッチ１
２、１６の対をオンして、残りの交流スイッチ１１、１
３〜１５はオフのままにすると、直列変圧器４の二次巻
線４ｂには、励磁変圧器５のタップＢＣ間電圧の電圧２
００Ｖが印加され、これが６．６ｋＶに加算されて電源
線１の出側電圧は６．８ｋＶとなる。In this voltage regulator 3, the power supply lines 1,
The voltage between 6.6 kV, the turns ratio between the primary side and the secondary side of the series transformer 4 is 1, the voltage between the taps AB of the secondary winding 5b of the exciting transformer 5 is 100V, and the voltage between the taps BC is 200V. I do. When increasing the voltage in this state, the AC switch 1
Turn on the pairs 2 and 16 and switch the remaining AC switches 11 and 1
When 3 to 15 are kept off, the secondary winding 4 b of the series transformer 4 has the voltage 2 between the tap BC and the voltage of the exciting transformer 5.
00V is applied, which is added to 6.6 kV, and the output voltage of the power supply line 1 becomes 6.8 kV.
【０００６】次に出側電圧を６．９ｋＶに上げる場合に
は、交流スイッチ１１、１６をオンし、残りの交流スイ
ッチ１２〜１５をオフにするとタップＡＣ間電圧は３０
０Ｖなので、直列変圧器４の二次巻線４ｂには、励磁変
圧器５の二次巻線５ｂの電圧３００Ｖが加算されて電源
線１の出側電圧は６．９ｋＶに上がる。When the output voltage is increased to 6.9 kV, the AC switches 11 and 16 are turned on, and the remaining AC switches 12 to 15 are turned off.
Since the voltage is 0 V, the voltage 300V of the secondary winding 5b of the exciting transformer 5 is added to the secondary winding 4b of the series transformer 4, and the output voltage of the power supply line 1 rises to 6.9 kV.
【０００７】電圧調整装置は、交流スイッチ１１〜１６
の半導体デバイスとして逆阻止三端子型サイリスタを逆
並列接続して使用しているので、サイリスタの特性とし
てターンオフ（オンからオフへの切換え）から完全にオ
フ能力を回復させるのは、サイリスタを流れる電流が０
になってから、ある時間（百マイクロ秒〜数百マイクロ
秒）逆電圧を印加することが必要である。これはもし交
流スイッチ１５と１６が同時にオン状態になると、タッ
プＢＣ間が短絡されてサイリスタが破損するおそれがあ
るからである。このタップ間短絡を防止するためにタッ
プ切換時には一旦、交流スイッチに流れている電流をバ
イパス回路６に移して交流スイッチがオフするのに十分
な時間を経てから、次に選択された交流スイッチに電流
を流すようにしている。[0007] The voltage adjusting device comprises AC switches 11 to 16
Because a reverse blocking three-terminal thyristor is connected in anti-parallel as a semiconductor device of the type described above, the characteristic of the thyristor is that the current that flows through the thyristor completely recovers the off-capability from turn-off (switching from on to off). Is 0
After that, it is necessary to apply a reverse voltage for a certain time (one hundred microseconds to several hundred microseconds). This is because if the AC switches 15 and 16 are turned on at the same time, the tap BC may be short-circuited and the thyristor may be damaged. In order to prevent the short circuit between taps, at the time of tap switching, a current flowing in the AC switch is temporarily transferred to the bypass circuit 6 and a sufficient time has elapsed for the AC switch to be turned off. The current flows.
【０００８】この１過程を図４に基づいて説明すると、
交流スイッチ１２と交流スイッチ１６がオンして直列変
圧器４の二次巻線４ｂと励磁変圧器５の二次巻線５ｂが
接続されている状態で、直列変圧器４の一次巻線４ａ側
に負荷電流ＩＬが流れていると、その二次巻線４ｂ側に
は一次電流による磁束を打ち消す向きに電流ＩＬ2 が流
れる。従ってこの電流ＩＬ2 は励磁変圧器５の二次巻線
５ｂと交流スイッチ１２、１６にも流れる。この状態で
バイパス回路６の交流スイッチ１７のゲートに制御装置
１０から制御信号を時刻ｔ1 で与えると交流スイッチ１
７がオンする。この後、やや遅れて時刻ｔ2 で交流スイ
ッチ１２と１６のゲート信号を停止する。This one process will be described with reference to FIG.
When the AC switch 12 and the AC switch 16 are turned on and the secondary winding 4b of the series transformer 4 and the secondary winding 5b of the exciting transformer 5 are connected, the primary winding 4a side of the series transformer 4 When a load current IL flows through the secondary winding 4b, a current IL2 flows in a direction to cancel the magnetic flux due to the primary current. Therefore, this current IL2 also flows through the secondary winding 5b of the exciting transformer 5 and the AC switches 12 and 16. In this state, when a control signal is applied from the control device 10 to the gate of the AC switch 17 of the bypass circuit 6 at time t1, the AC switch 1
7 turns on. Thereafter, the gate signals of the AC switches 12 and 16 are stopped at time t2 with a slight delay.
【０００９】交流スイッチ１２、１６が導通している状
態では、直列変圧器４の二次巻線４ｂには２００Ｖが印
加されているので、バイパス回路６の交流スイッチ１７
がオンすると抵抗器７にも２００Ｖが印加される。この
結果、抵抗器７にはＩｒ＝２００／Ｒ（但しＲは抵抗器
７の抵抗値）の電流が流れ、励磁変圧器５にはＩＬ2＋
Ｉｒの電流が流れる。交流スイッチ１２、１６は時刻ｔ
2 以降にその電流が０になった時点ｔ3 でオフに転じ
る。その後、直列変圧器４の二次電流ＩＬ2 はバイパス
回路６を介して流れる。When the AC switches 12 and 16 are conducting, since 200 V is applied to the secondary winding 4b of the series transformer 4, the AC switch 17 of the bypass circuit 6 is turned on.
Is turned on, 200 V is also applied to the resistor 7. As a result, a current of Ir = 200 / R (where R is the resistance value of the resistor 7) flows through the resistor 7, and IL2 + flows through the exciting transformer 5.
Ir current flows. AC switches 12 and 16 are at time t
After that, the current turns off at time t3 when the current becomes zero. Thereafter, the secondary current IL2 of the series transformer 4 flows through the bypass circuit 6.
【００１０】次に選択する交流スイッチ１１、１６に時
刻ｔ4 でゲート信号を与えた後、バイパス回路６の交流
スイッチ１７のゲート信号を時刻ｔ5 で止める。この交
流スイッチ１７はそのゲート信号を止めた直後に電流が
０となる時刻ｔ6 でオフする。それ以降、負荷電流ＩＬ
2 は、交流スイッチ１１、１６を経て励磁変圧器５に流
れる。交流スイッチ１１、１６が導通することにより直
列変圧器４の二次巻線４ｂには３００Ｖが印加されて電
源線１、２の出側電圧は６．９ｋＶに上がる。After a gate signal is supplied to the selected AC switches 11 and 16 at time t4, the gate signal of the AC switch 17 of the bypass circuit 6 is stopped at time t5. The AC switch 17 is turned off at time t6 when the current becomes 0 immediately after the gate signal is stopped. Thereafter, the load current IL
2 flows to the exciting transformer 5 via the AC switches 11 and 16. When the AC switches 11 and 16 conduct, 300 V is applied to the secondary winding 4 b of the series transformer 4, and the output voltages of the power lines 1 and 2 rise to 6.9 kV.
【００１１】このように、タップ切換えを行なう場合に
は、サイリスタで形成された交流スイッチ１１〜１６の
うちオンしている２つの交流スイッチを流れる電流をバ
イパス回路６に一旦移して、全ての交流スイッチ１１〜
１６をオフした後、次に選択された２つの交流スイッチ
をオンにするという過程を経ることによりタップの切換
を確実に行なうようになっている。As described above, when the tap switching is performed, the current flowing through the two AC switches that are turned on among the AC switches 11 to 16 formed by the thyristors is temporarily transferred to the bypass circuit 6, and all the AC currents are switched. Switches 11 to
After turning off the switch 16, the two selected AC switches are turned on, so that the taps can be reliably switched.
【００１２】ここでタップ切換え時の限流リアクトル８
の作用を考える。バイパス回路６に電流が流れている際
には、直列変圧器４の二次巻線４ｂにはＩＬ2 ・Ｚs の
電圧が印加される。ここでＺs は直列変圧器４の二次巻
線４ｂ、限流リアクトル８およびバイパス回路６の内部
の合成インピーダンスである。この場合、図４に矢印で
示すように次の交流スイッチ１１、１６がオンすると、
直列変圧器４の二次巻線４ｂには再び同一方向の電圧が
印加されることがある。Here, the current limiting reactor 8 at the time of tap switching
Consider the action of When a current flows through the bypass circuit 6, a voltage of IL2.Zs is applied to the secondary winding 4b of the series transformer 4. Here, Zs is a combined impedance inside the secondary winding 4b of the series transformer 4, the current limiting reactor 8, and the bypass circuit 6. In this case, when the next AC switches 11 and 16 are turned on as indicated by arrows in FIG.
A voltage in the same direction may be applied to the secondary winding 4b of the series transformer 4 again.
【００１３】直列変圧器４はタップ電圧の最高値（この
場合は３００Ｖ）に合わせて鉄心のサイズを決めている
ので、続けて同一方向の電圧が印加されると鉄心は飽和
する。そのため、励磁変圧器５の二次巻線５ｂから見た
インピーダンスが低下し、交流スイッチ、限流リアクト
ル８および直列変圧器４の二次巻線４ｂを通る電流はＩ
Ｌ2 よりはるかに大きな電流が流れる可能性があり、そ
の電流を制御するのが限流リアクトル８の役割である。Since the size of the core of the series transformer 4 is determined in accordance with the maximum value of the tap voltage (300 V in this case), the core is saturated when a voltage is continuously applied in the same direction. Therefore, the impedance seen from the secondary winding 5b of the exciting transformer 5 decreases, and the current passing through the AC switch, the current limiting reactor 8, and the secondary winding 4b of the series transformer 4 becomes I
A current much larger than L2 may flow, and the role of the current limiting reactor 8 is to control the current.
【００１４】限流リアクトル８は、大電流が流れる際に
飽和してインピーダンスが低下することがないように、
通常は空心リアクトルを使用している。このため必然的
に外形は大きく、巻線長は増大し、電圧調整装置全体の
外形が大きくなり、コストアップや損失増加の要因とな
っていた。The current limiting reactor 8 is designed to prevent the impedance from lowering due to saturation when a large current flows.
Usually, an air-core reactor is used. For this reason, the outer shape is inevitably large, the winding length is increased, and the outer shape of the entire voltage regulator is increased, resulting in an increase in cost and loss.
【００１５】[0015]
【発明が解決しようとする課題】本発明は上記欠点を除
去し、装置の小型化、低コスト化を図ることができる電
圧調整装置を提供するものである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a voltage regulator capable of eliminating the above-mentioned disadvantages and reducing the size and cost of the device.
【００１６】[0016]
【課題を解決するための手段】本発明の請求項１記載の
電圧調整装置は、電源線に直列的に接続された直列変圧
器の二次巻線と、電源線間に並列的に接続された励磁変
圧器のタップ付き二次巻線とを、サイリスタで形成され
た複数の交流スイッチを介して接続し、これら交流スイ
ッチにバイパス回路を並列に接続して、タップ切換え時
にタップ選択器から切換信号を出力して交流スイッチに
流れる電流を、一旦、バイパス回路に流してから次に選
択される交流スイッチをオンさせてタップの切換えを行
なう電圧調整装置において、前記励磁変圧器の二次巻線
最大タップ電圧Ｖを，前記直列変圧器二次巻線側短絡イ
ンピーダンスＺｓ２と励磁変圧器最大タップ間短絡イン
ピーダンスＺｅとの和で除した値（Ｖ／（Ｚｓ２＋Ｚ
ｅ) ）が、交流電源の少なくとも数サイクル以内におけ
るサイリスタ許容サージオン電流ＩＴＨ、ヒューズ溶断
電流ＩＦまたは配線用遮断器トリップ電流ＩＣＢのいず
れよりも十分小さくなるように、直列変圧器二次巻線側
短絡インピーダンスＺｓ２と励磁変圧器最大タップ間短
絡インピーダンスＺｅを選定したことを特徴とするもの
である。According to a first aspect of the present invention, there is provided a voltage regulator connected in parallel between a power supply line and a secondary winding of a series transformer connected in series to a power supply line. Connected to the secondary winding with a tap of the exciting transformer via a plurality of AC switches formed of thyristors, and a bypass circuit is connected in parallel to these AC switches, and the tap is switched from the tap selector when switching taps. In a voltage regulator for outputting a signal and flowing a current flowing through an AC switch to a bypass circuit, and then switching on a tap by turning on a next selected AC switch, a secondary winding of the exciting transformer is provided. The value (V / (Zs2 + Z) obtained by dividing the maximum tap voltage V by the sum of the series transformer secondary winding side short-circuit impedance Zs2 and the exciting transformer maximum inter-tap short-circuit impedance Ze.
e) The series transformer secondary winding side short circuit so that) is sufficiently smaller than the thyristor allowable surge-on current ITH, the fuse blowing current IF or the wiring breaker trip current ICB within at least several cycles of the AC power supply. An impedance Zs2 and a short-circuit impedance Ze between the maximum taps of the exciting transformer are selected.
【００１７】また請求項２記載の電圧調整装置は、前記
励磁変圧器二次巻線の中間タップ部に短絡電流制御リア
クトルを挿入したことを特徴とするものである。According to a second aspect of the present invention, a short-circuit current control reactor is inserted into an intermediate tap portion of the secondary winding of the exciting transformer.
【００１８】[0018]
【発明の実施の形態】以下本発明の実施の一形態を図１
を参照して詳細に説明する。図１において４０は直列変
圧器、４０ｂはその二次巻線、５０は励磁変圧器、５０
ｂはその二次巻線である。励磁変圧器５０と直列変圧器
４０は、それぞれ図３に示す従来の励磁変圧器５と直列
変圧器４の漏れインダクタンスより大きくして、短絡イ
ンピーダンスを大としたものである。また図３に示す装
置では限流リアクトル８が直列変圧器４の飽和時に交流
スイッチに流れる過電流値を規定しているが、図１の装
置ではこの限流リアクトル８を除いた構成となってい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described in detail with reference to FIG. In FIG. 1, 40 is a series transformer, 40b is its secondary winding, 50 is an exciting transformer, 50
b is the secondary winding. The exciting transformer 50 and the series transformer 40 are respectively larger than the leakage inductance of the conventional exciting transformer 5 and the series transformer 4 shown in FIG. Further, in the device shown in FIG. 3, the current limiting reactor 8 regulates an overcurrent value flowing through the AC switch when the series transformer 4 is saturated, but the device of FIG. 1 has a configuration excluding the current limiting reactor 8. I have.
【００１９】前記励磁変圧器二次巻線５０ｂの最大タッ
プ電圧Ｖとし、前記直列変圧器二次巻線４０ｂの短絡イ
ンピーダンスＺｓ２とし、励磁変圧器５０の最大タップ
間短絡インピーダンスＺｅとすると、最大タップ電圧Ｖ
を短絡インピーダンスＺｓ２と最大タップ間短絡インピ
ーダンスＺｅの和で除した値（Ｖ／（Ｚｓ２＋Ｚｅ)）
が、交流電源の少なくとも数サイクル以内におけるサイ
リスタ許容サージオン電流ＩＴＨまたはヒューズ３１、
３２の溶断電流ＩＦのいずれよりも十分小さくなるよう
に、直列変圧器二次巻線４０ｂ側の短絡インピーダンス
Ｚｓ２と励磁変圧器５０の最大タップ間短絡インピーダ
ンスＺｅが選定されている。Assuming that the maximum tap voltage V of the exciting transformer secondary winding 50b, the short-circuit impedance Zs2 of the series transformer secondary winding 40b, and the maximum inter-tap short-circuit impedance Ze of the exciting transformer 50, Voltage V
Divided by the sum of short-circuit impedance Zs2 and maximum short-circuit impedance Ze between taps (V / (Zs2 + Ze))
Is the thyristor allowable surge-on current ITH or fuse 31 within at least several cycles of the AC power supply.
The short-circuit impedance Zs2 on the series transformer secondary winding 40b side and the maximum inter-tap short-circuit impedance Ze of the exciting transformer 50 are selected so as to be sufficiently smaller than any of the fusing currents IF of the 32.
【００２０】直列変圧器４０と励磁変圧器５０の漏れイ
ンダクタンスは、一次巻線と二次巻線の磁束が互いに相
手側の巻線に鎖交しないことから生ずるものであり、例
えばコイル間の距離を大きく離すことにより、漏れイン
ダクタンスを増加させて短絡インピーダンスＺｓ２＋Ｚ
ｅを大きく形成し、この結果、交流スイッチ１１〜１６
に流れる短絡電流を小さくすることができる。なお電圧
調整装置の他の構成は図３に示す従来のものと同じであ
るため説明は省略する。The leakage inductance of the series transformer 40 and the exciting transformer 50 is caused by the fact that the magnetic fluxes of the primary winding and the secondary winding do not interlink with each other's windings. Greatly increases the leakage inductance to increase the short-circuit impedance Zs2 + Z
e is formed large, and as a result, the AC switches 11 to 16
The short-circuit current flowing through the circuit can be reduced. The other configuration of the voltage regulator is the same as the conventional one shown in FIG.
【００２１】従って上記構成をなす電圧調整装置は、直
列変圧器二次巻線４０ｂと励磁変圧器５０の短絡インダ
クタンスＺｓ２、Ｚｅを増やすことにより、二つの変圧
器は多少大型化するが、従来の限流リアクトル８を省略
できるため、全体として装置が小型化され経済的効果も
得られる。Therefore, in the voltage regulator having the above configuration, the two transformers are slightly enlarged by increasing the short-circuit inductances Zs2 and Ze of the series transformer secondary winding 40b and the exciting transformer 50. Since the current limiting reactor 8 can be omitted, the size of the apparatus can be reduced as a whole, and an economic effect can be obtained.
【００２２】なお上記説明では直列変圧器４０の二次巻
線４０ｂと励磁変圧器５０の短絡インピーダンスの和を
規定したが、励磁変圧器５０の短絡インピーダンスＺｅ
の方を最初に規定し、残りのインピーダンスを直列変圧
器４０の二次巻線４０ｂに分担させても良い。この理由
は、交流スイッチ１１〜１６のうち交流スイッチ１１と
１３が誤って同時にオンしたとする。その場合は、励磁
変圧器２次巻線のＡＣ間が短絡されたことになり、大電
流が交流スイッチ１１と１３に流れる。In the above description, the sum of the short-circuit impedance of the secondary winding 40b of the series transformer 40 and the short-circuit impedance of the exciting transformer 50 is specified.
May be defined first, and the remaining impedance may be shared by the secondary winding 40b of the series transformer 40. The reason is that the AC switches 11 and 13 among the AC switches 11 to 16 are erroneously turned on at the same time. In this case, the AC between the secondary windings of the exciting transformer is short-circuited, and a large current flows through the AC switches 11 and 13.
【００２３】これによる過電流で交流スイッチ１１と１
３のサイリスタが破損することがないように、励磁変圧
器５０の短絡インピーダンスの割合を更に高くして、短
絡電流をサージオン電流以下に下げれば、交流スイッチ
１１と１３の誤ターンオンなどで短絡が生じた場合に保
護することができる。As a result, the AC switches 11 and 1
If the ratio of the short-circuit impedance of the exciting transformer 50 is further increased and the short-circuit current is reduced to the surge-on current or less so that the thyristor No. 3 is not damaged, a short-circuit occurs due to erroneous turn-on of the AC switches 11 and 13. Can be protected.
【００２４】図２は本発明の他の実施の形態を示すもの
で、励磁変圧器５０の二次巻線タップのＢ点に短絡電流
制御リアクトル５１を挿入したものである。これは励磁
変圧器５０の各タップ間から見た短絡インピーダンスは
最大タップＡＣ間のインピーダンスＺｅが最大になり、
ＡＢ間の短絡インピーダンスＺＡＢは最小になるのが普
通である。そのため、直列変圧器４０の二次巻線４０ｂ
側のインピーダンスＺｓ２で定まる電流値よりも、タッ
プＡＢ間あるいはタップＢＣ間を介して流れる電流が大
きくなる場合は、励磁変圧器の外に短絡電流制御リアク
トル５１を追加するのが効果的である。FIG. 2 shows another embodiment of the present invention, in which a short-circuit current control reactor 51 is inserted at a point B of a secondary winding tap of an exciting transformer 50. This means that the short circuit impedance viewed from between the taps of the exciting transformer 50 is such that the impedance Ze between the maximum taps AC becomes maximum,
Normally, the short-circuit impedance ZAB between AB is minimized. Therefore, the secondary winding 40b of the series transformer 40
If the current flowing between the taps AB and between the taps BC becomes larger than the current value determined by the impedance Zs2 on the side, it is effective to add the short-circuit current control reactor 51 outside the excitation transformer.
【００２５】この際、必要な短絡電流制御リアクトル５
１の大きさは、限流リアクトル８の１／１０ないし１／
２０程度の小さなリアクトルでよい。なお、サイリスタ
の保護用に１０μＨ前後のリアクトルを入れることがあ
る。これはサイリスタのスナバ用として用いるので、本
発明が目的とするタップ切換え時の過電流抑制としては
実質的な効果はない。At this time, the necessary short-circuit current control reactor 5
The size of 1 is 1/10 to 1 / of the current limiting reactor 8
A small reactor of about 20 is sufficient. In some cases, a reactor of about 10 μH may be inserted to protect the thyristor. Since this is used for a snubber of a thyristor, it has no substantial effect as an object of the present invention to suppress overcurrent at the time of tap switching.
【００２６】なお上記説明では励磁変圧器５０の二次巻
線タップにヒューズ３１、３２を接続した場合について
示したが、この代わりに配線用遮断器を取付けても良
い。この場合、最大タップ電圧Ｖを短絡インピーダンス
Ｚｓ２と最大タップ間短絡インピーダンスＺｅの和で除
した値（Ｖ／（Ｚｓ２＋Ｚｅ) ）より、数サイクル以内
における配線用遮断器のトリップ電流ＩＣＢが十分に小
さくなるように選定する。In the above description, the case where the fuses 31 and 32 are connected to the secondary winding tap of the exciting transformer 50 has been described. However, a wiring breaker may be attached instead. In this case, the trip current ICB of the circuit breaker within several cycles is sufficiently smaller than a value (V / (Zs2 + Ze)) obtained by dividing the maximum tap voltage V by the sum of the short-circuit impedance Zs2 and the maximum inter-tap short-circuit impedance Ze. Select as follows.
【００２７】上記図面では単相回路の場合について説明
したが、３相などの多相回路にも適用できることは明ら
かである。また励磁変圧器５０は配電線１、２の入り側
１ａに設ける必要はなく、出側１ｂに設けてもよい。更
に本発明は配電線の電圧調整装置に適用した例で説明し
ているが、一般の負荷を対象とした電源において、電源
または負荷電圧の調整用にも広く適用することができ
る。In the above drawings, the case of a single-phase circuit has been described, but it is clear that the present invention can be applied to a multi-phase circuit such as a three-phase circuit. Excitation transformer 50 does not need to be provided on entrance side 1a of distribution lines 1 and 2, and may be provided on exit side 1b. Furthermore, although the present invention has been described with reference to an example in which the present invention is applied to a voltage adjusting device for a distribution line, the present invention can be widely applied to power supply or load voltage adjustment in power supplies for general loads.
【００２８】[0028]
【発明の効果】以上説明した如く本発明の請求項１記載
の電圧調整装置によれば、限流リアクトルを省くことが
できるので装置全体を小形化、低コスト化することがで
きる。また請求項２記載の電圧調整装置は、励磁変圧器
の二次巻線タップに短絡電流制御リアクトルを挿入する
ことにより、タップ間を流れる電流が大きい場合に効果
的である。As described above, according to the voltage regulator according to the first aspect of the present invention, since the current limiting reactor can be omitted, the entire device can be reduced in size and cost. The voltage regulator according to claim 2 is effective when a current flowing between the taps is large by inserting a short-circuit current control reactor into the secondary winding tap of the exciting transformer.
【図１】本発明の実施の一形態による単相回路で示した
電圧調整装置の回路図である。FIG. 1 is a circuit diagram of a voltage regulator shown as a single-phase circuit according to an embodiment of the present invention.
【図２】本発明の他の実施の形態による短絡電流制御リ
アクトルを設けた電圧調整装置の回路図である。FIG. 2 is a circuit diagram of a voltage regulator provided with a short-circuit current control reactor according to another embodiment of the present invention.
【図３】従来使用されている配電線用の電圧調整装置の
回路例である。FIG. 3 is a circuit example of a conventionally used voltage adjusting device for distribution lines.
【図４】タップ切換え時の各部波形の１例を示す波形図
である。FIG. 4 is a waveform chart showing one example of waveforms of respective parts at the time of tap switching.
１ 電源線 ３ 電圧調整装置 ４ 直列変圧器 ４ｂ 二次巻線 ５ 励磁変圧器 ５ｂ 二次巻線 ６ バイパス回路 ７ 抵抗器 ８ 限流リアクトル １０ 制御装置 １１ 交流スイッチ ２０ 電圧検出部 ２１ 基準電圧部 ２３ タップ選択器 ３１ ヒューズ ３３ 非線形抵抗器 ４０ 直列変圧器 ４０ｂ 二次巻線 ５０ 励磁変圧器 ５０ｂ 二次巻線 ５１ 短絡電流制御リアクトル DESCRIPTION OF SYMBOLS 1 Power supply line 3 Voltage regulator 4 Series transformer 4b Secondary winding 5 Exciting transformer 5b Secondary winding 6 Bypass circuit 7 Resistor 8 Current limiting reactor 10 Controller 11 AC switch 20 Voltage detector 21 Reference voltage unit 23 Tap selector 31 Fuse 33 Non-linear resistor 40 Series transformer 40b Secondary winding 50 Exciting transformer 50b Secondary winding 51 Short-circuit current control reactor
Claims (2)
の二次巻線と、電源線間に並列的に接続された励磁変圧
器のタップ付き二次巻線とを、サイリスタで形成された
複数の交流スイッチを介して接続し、これら交流スイッ
チにバイパス回路を並列に接続して、タップ切換え時に
タップ選択器から切換信号を出力して交流スイッチに流
れる電流を、一旦、バイパス回路に流してから次に選択
される交流スイッチをオンさせてタップの切換えを行な
う電圧調整装置において、前記励磁変圧器の二次巻線最
大タップ電圧Ｖを，前記直列変圧器二次巻線側短絡イン
ピーダンスＺｓ２と励磁変圧器最大タップ間短絡インピ
ーダンスＺｅとの和で除した値（Ｖ／（Ｚｓ２＋Ｚｅ)
）が、交流電源の少なくとも数サイクル以内における
サイリスタ許容サージオン電流ＩＴＨ、ヒューズ溶断電
流ＩＦまたは配線用遮断器トリップ電流ＩＣＢのいずれ
よりも十分小さくなるように、直列変圧器二次巻線側短
絡インピーダンスＺｓ２と励磁変圧器最大タップ間短絡
インピーダンスＺｅを選定したことを特徴とする電圧調
整装置。1. A thyristor forms a secondary winding of a series transformer connected in series to a power supply line and a tapped secondary winding of an excitation transformer connected in parallel between the power supply lines. Connected through a plurality of AC switches, a bypass circuit is connected to these AC switches in parallel, a switching signal is output from the tap selector at the time of tap switching, and a current flowing through the AC switch is once passed to the bypass circuit. In the voltage regulator for switching the tap by turning on an AC switch selected next after flowing, the maximum tap voltage V of the secondary winding of the exciting transformer is changed to the short-circuit impedance on the secondary winding side of the series transformer. The value (V / (Zs2 + Ze) divided by the sum of Zs2 and the short-circuit impedance Ze between the exciting transformer and the maximum tap.
) Is sufficiently smaller than any of the thyristor allowable surge-on current ITH, the fuse blowing current IF and the circuit breaker trip current ICB within at least several cycles of the AC power supply, and the short-circuit impedance Zs2 on the secondary winding of the series transformer. And a maximum impedance short-circuit impedance Ze between the transformer and the exciting transformer.
絡電流制御リアクトルを挿入したことを特徴とする請求
項１記載の電圧調整装置。2. The voltage adjusting device according to claim 1, wherein a short-circuit current control reactor is inserted into an intermediate tap portion of the exciting transformer secondary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23788698A JP3338655B2 (en) | 1998-08-25 | 1998-08-25 | Voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23788698A JP3338655B2 (en) | 1998-08-25 | 1998-08-25 | Voltage regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000066739A true JP2000066739A (en) | 2000-03-03 |
| JP3338655B2 JP3338655B2 (en) | 2002-10-28 |
Family
ID=17021887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23788698A Expired - Lifetime JP3338655B2 (en) | 1998-08-25 | 1998-08-25 | Voltage regulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3338655B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012165638A (en) * | 2011-02-08 | 2012-08-30 | General Electric Co <Ge> | Dynamic voltage restoration system and method |
| CN104124691A (en) * | 2013-08-20 | 2014-10-29 | 朱晓云 | System electricity saving optimization, electric energy automatic adjustment and voltage stabilization device and device group thereof |
-
1998
- 1998-08-25 JP JP23788698A patent/JP3338655B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012165638A (en) * | 2011-02-08 | 2012-08-30 | General Electric Co <Ge> | Dynamic voltage restoration system and method |
| US9634490B2 (en) | 2011-02-08 | 2017-04-25 | General Electric Company | Dynamic voltage restoration system and method |
| CN104124691A (en) * | 2013-08-20 | 2014-10-29 | 朱晓云 | System electricity saving optimization, electric energy automatic adjustment and voltage stabilization device and device group thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3338655B2 (en) | 2002-10-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6075684A (en) | Method and arrangement for direct current circuit interruption | |
| Dubey | Thyristorised power controllers | |
| US8830647B2 (en) | Fault current limiter | |
| US3600664A (en) | Overcurrent protection for solid-state voltage regulator | |
| JP4756046B2 (en) | Voltage control device | |
| US3959695A (en) | Circuit interrupter with ground fault trip control | |
| US6104106A (en) | Solid state circuit breaker | |
| US8207716B2 (en) | Useful improvements in the art of 3-phase electronic tap changer commutation device | |
| US5786684A (en) | Apparatus and methods for minimizing over voltage in a voltage regulator | |
| US4686618A (en) | Fault protection for GTO voltage-source inverters | |
| JPH1195846A (en) | Voltage regulator | |
| JPH05176445A (en) | Three-phase short circuit suppressor | |
| CA2106504C (en) | Conversion apparatus | |
| KR20220069116A (en) | transformer device | |
| JP3338655B2 (en) | Voltage regulator | |
| US7737667B2 (en) | 3-phase electronic tap changer commutation and device | |
| GB2307803A (en) | Static VAR compensator with capacitor energy dissipation | |
| JP3338656B2 (en) | Voltage regulator | |
| Wang et al. | Low-loss bidirectional solid-state circuit breakers with reliable breaking capability for protecting DC microgrids | |
| JP2002165454A (en) | Ac voltage regulator | |
| JP2000164441A (en) | Potential transformer device | |
| KR20040005462A (en) | Apparatus for generating voltage sag and voltage swell | |
| JP2003050638A (en) | Voltage controller | |
| JP3231374B2 (en) | Earth leakage breaker | |
| SU845219A1 (en) | Controllable reactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070809 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080809 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080809 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090809 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090809 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100809 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100809 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110809 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110809 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120809 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120809 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130809 Year of fee payment: 11 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |