JP4999154B2 - Reduced voltage starting device - Google Patents

Reduced voltage starting device Download PDF

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JP4999154B2
JP4999154B2 JP2006317139A JP2006317139A JP4999154B2 JP 4999154 B2 JP4999154 B2 JP 4999154B2 JP 2006317139 A JP2006317139 A JP 2006317139A JP 2006317139 A JP2006317139 A JP 2006317139A JP 4999154 B2 JP4999154 B2 JP 4999154B2
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electric motor
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JP2008131825A (en
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龍伸 一柳
吉田　　誠
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Nihon University
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Description

本発明は、コンドルファ始動方式の減電圧始動装置に関するものである。   The present invention relates to a reduced voltage starting device of a condorfa starting type.

三相単巻変圧器を補償器として備え、この補償器で過渡的にリアクトル回路を形成することで、低電圧から全電圧へと移行する際に、突入電流のショックを緩和するコンドルファ始動方式が知られている（特許文献１参照）。
特開平６−２４５５５９号公報 Condorfa starter system that mitigates the shock of inrush current when transitioning from low voltage to full voltage by forming a three-phase autotransformer as a compensator and forming a transient reactor circuit with this compensator Is known (see Patent Document 1).
JP-A-6-245559

しかしながら、リアクトル回路を形成する前に、一旦、三相単巻変圧器をスター結線して分電圧供給状態にする必要があり、スター結線にするタイミングによっては、各相にアンバランスな電位差が生じ過大な突入電流が流れてしまうので、接点の焼損を招いたり、インバータ側の過電流継電器がトリップしたりする可能性があった。
特に、エンジン・ジェネレータを電源とする設備では、ジェネレータの小型化が望まれており、ジェネレータが低容量型になるほど、過電流継電器の動作電流を低く設定することになるので、トリップの問題は一層顕著になると考えられる。
本発明の課題は、コンドルファ始動において、三相単巻変圧器をスター結線するときの突入電流を抑制することである。 However, before forming the reactor circuit, it is necessary to star-connect the three-phase auto-transformer to make it a partial voltage supply state. Depending on the timing of star connection, an unbalanced potential difference occurs in each phase. Since an excessive inrush current flows, there is a possibility of causing contact burnout or tripping of the inverter overcurrent relay.
In particular, in equipment that uses an engine / generator as a power source, it is desired to reduce the size of the generator. The lower the capacity of the generator, the lower the operating current of the overcurrent relay. It will be noticeable.
An object of the present invention is to suppress an inrush current when star-connecting a three-phase auto-transformer in starting a condorfa.

上記課題を解決するために、本発明の請求項１に係る減電圧始動装置は、コンドルファ始動方式の減電圧始動装置において、電源及び電動機の間に介挿され、スター結線された三相単巻変圧器と、該三相単巻変圧器における各相のコイル及び中性点の間に介挿されたスター結線用接触器と、該スター結線用接触器と並列に接続された抵抗器と、前記スター結線用接触器と並列、且つ前記抵抗器と直列に接続された抵抗挿入用接触器と、前記電動機を始動する際、前記抵抗挿入用接触器を接続することで前記三相単巻変圧器における各相のコイル及び中性点の間に前記抵抗器を挿入した回路を形成してから、電源の投入、及び前記スター結線用接触器の接続を順に行い、前記電源を投入したときの突入電流を前記抵抗器で抑制した後に、前記抵抗挿入用接触器、及び前記スター結線用接触器を遮断する制御手段と、を備えたことを特徴とする。 In order to solve the above-mentioned problem, a reduced voltage starting device according to claim 1 of the present invention is a three-phase single-connected single-phased insertion device between a power source and an electric motor in a reduced voltage starting device of a condorfa starting type. A winding transformer, a star connection contactor interposed between a coil and a neutral point of each phase in the three-phase autotransformer, and a resistor connected in parallel with the star connection contactor The three-phase single winding by connecting the resistance insertion contactor in parallel with the star connection contactor and in series with the resistor and connecting the resistance insertion contactor when starting the motor after forming a circuit which included the resistor between each phase coil and the neutral point in the transformer, power cycle, and have sequentially line connection of the star connecting contactor, was charged with the power supply After the inrush current is suppressed by the resistor, the resistance Insertion contactor, and characterized by comprising a control means for interrupting the star connecting contactor.

また、本発明の請求項２に係る減電圧始動装置は、コンドルファ始動方式の減電圧始動装置において、電源及び電動機の間に介挿され、スター結線された三相単巻変圧器と、該三相単巻変圧器のコイル及び中性点の間に介挿されたスター結線用接触器と、前記電動機を始動する際、電源を投入してから突入電流が収束するまでの所定時間だけ前記スター結線用接触器の接続を遅延させることで前記電動機を抵抗器として作用させる制御手段と、を備えたことを特徴とする。
この所定時間とは、突入電流が収束するまでの時間に相当し、５０又は６０［Hz］の場合、０.０２〜０.１［sec］程度である。 A reduced voltage starting device according to claim 2 of the present invention is a reduced voltage starting device of a condorfa starting method, wherein the three-phase single-turn transformer inserted between a power source and an electric motor and star-connected, The star connection contactor inserted between the coil and the neutral point of the three-phase autotransformer, and when starting the motor, the predetermined time from when the power is turned on until the inrush current converges Control means for causing the electric motor to act as a resistor by delaying the connection of the contactor for star connection.
This predetermined time corresponds to the time until the inrush current converges, and is about 0.02 to 0.1 [sec] in the case of 50 or 60 [Hz].

請求項１に係る発明によれば、抵抗挿入用接触器を接続してから、電源の投入、及びスター結線用接触器の接続を順に行うので、抵抗器によって突入電流を確実に抑制することができる。
請求項２に係る発明によれば、電源を投入してから所定時間だけスター結線用接触器の接続を遅延させることで、このスター結線用接触器が接続されるまでは、電動機が無限大の抵抗器として作用するので、過大な突入電流を抑制することができる。 According to the first aspect of the invention, since the power supply and the star connection contactor are sequentially connected after connecting the resistor insertion contactor, the inrush current can be reliably suppressed by the resistor. it can.
According to the invention according to claim 2, by delaying the connection of the star connection contactor for a predetermined time after turning on the power, the motor is infinite until the star connection contactor is connected. Since it acts as a resistor, an excessive inrush current can be suppressed.

以下、本発明の実施形態を図面に基づいて説明する。
《第１実施形態》
図１は、第１実施形態におけるコンドルファ始動の概略構成と、そのシーケンス回路であり、電源と電動機との間に、スター結線された三相単巻変圧器を補償器ＫＣとして備えている。主接触器５２は電源を投入し、短絡用接触器４２は補償器ＫＣを短絡できる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< First Embodiment >>
FIG. 1 is a schematic configuration of a condorfa start in the first embodiment and its sequence circuit, and includes a star-connected three-phase single-turn transformer as a compensator KC between a power source and an electric motor. The main contactor 52 is turned on, and the short-circuit contactor 42 can short-circuit the compensator KC.

そして、補償器ＫＣにおける各相のコイル及び中性点の間には、スター結線用接触器６を介挿しており、このスター結線用接触器６を接続するときに、補償器ＫＣをスター結線できる。また、スター結線用接触器６と並列に抵抗器Ｒを接続すると共に、スター結線用接触器６と並列、且つ抵抗器Ｒと直列に抵抗挿入用接触器６Ｒを接続している。したがって、スター結線用接触器６を遮断している状態で、抵抗挿入用接触器６Ｒを接続すると、各相のコイルと中性点との間に抵抗器Ｒを挿入した回路となる。なお、抵抗器Ｒの抵抗値は、電動機の定格電流に応じて決定される。   A star connection contactor 6 is interposed between the coils and neutral points of each phase in the compensator KC, and when the star connection contactor 6 is connected, the compensator KC is connected to the star connection. it can. A resistor R is connected in parallel with the star connection contactor 6, and a resistance insertion contactor 6 R is connected in parallel with the star connection contactor 6 and in series with the resistor R. Therefore, when the resistance insertion contactor 6R is connected while the star connection contactor 6 is cut off, a circuit in which the resistor R is inserted between the coil of each phase and the neutral point is obtained. The resistance value of the resistor R is determined according to the rated current of the motor.

次に、第１実施形態の始動手順を説明する。
１．シーケンス回路の電源を投入する。
２．抵抗挿入用接触器６Ｒが接続され、各相のコイルと中性点との間に抵抗器Ｒを挿入した回路が形成される。
３．主接触器５２が投入される。
４．スター結線用接触器６が接続されることで、補償器ＫＣがスター結線され、補償器ＫＣを介した分電圧供給状態となる。
５．タイマーリレー２によって、シーケンス回路の電源が投入されてから所定時間（例えば０.２５［sec］）後に、抵抗挿入用接触器６Ｒ、及びスター結線用接触器６が遮断され、補償器ＫＣによってリアクトル回路が形成される。また、接触器４２Ｘが接続され、これは自己保持される。
６．短絡用接触器４２が接続され、全電圧へと移行する。 Next, the starting procedure of the first embodiment will be described.
1. Turn on the power to the sequence circuit.
2. A resistor insertion contactor 6R is connected to form a circuit in which the resistor R is inserted between the coil of each phase and the neutral point.
3. The main contactor 52 is turned on.
4). When the star connection contactor 6 is connected, the compensator KC is star-connected, and a voltage dividing state is provided via the compensator KC.
5. After a predetermined time (for example, 0.25 [sec]) after the sequence circuit is turned on by the timer relay 2, the resistance insertion contactor 6R and the star connection contactor 6 are cut off, and the reactor is operated by the compensator KC. A circuit is formed. A contactor 42X is connected and is self-held.
6). The short-circuit contactor 42 is connected and transitions to full voltage.

次に、第１実施形態の作用効果を説明する。
従来のコンドルファ始動方式では、補償器ＫＣをスター結線する際に、各相にアンバランスな電位差が生じ、図２に示すように、過大な突入電流が流れてしまう可能性があり、これは接点の焼損を招いたり、インバータ側の過電流継電器がトリップしたりする可能性があった。
本実施形態では、電動機を始動する際、抵抗挿入用接触器６Ｒを接続してから、電源の投入、及びスター結線用接触器６の接続を順に行うことにした。これにより、各相のコイルと中性点との間に抵抗器Ｒを挿入した回路が形成されるので、図３に示すように、突入電流を確実に抑制することができる。
したがって、接点の焼損や、過電流継電器のトリップを防止できる。 Next, the function and effect of the first embodiment will be described.
In the conventional condorfa starting method, when the compensator KC is star-connected, an unbalanced potential difference occurs in each phase, and an excessive inrush current may flow as shown in FIG. Contact burnout could occur, or the inverter overcurrent relay could trip.
In this embodiment, when the electric motor is started, the resistor insertion contactor 6R is connected, and then the power is turned on and the star connection contactor 6 is sequentially connected. As a result, a circuit in which the resistor R is inserted between the coil of each phase and the neutral point is formed, so that the inrush current can be reliably suppressed as shown in FIG.
Therefore, contact burnout and overcurrent relay trip can be prevented.

《第２実施形態》
図４は、第２実施形態におけるコンドルファ始動の概略構成と、そのシーケンス回路であり、構成については従来のコンドルファ始動と同一である。すなわち、第１実施形態における抵抗器Ｒ、及び抵抗挿入用接触器６Ｒを省略したものなので、図１との対応部分には同一符号を付し、詳細な説明は省略する。 << Second Embodiment >>
FIG. 4 is a schematic configuration of a condorfa start in the second embodiment and its sequence circuit, and the configuration is the same as that of a conventional condorfa start. That is, since the resistor R and the resistor insertion contactor 6R in the first embodiment are omitted, the same reference numerals are given to the corresponding parts to those in FIG. 1, and the detailed description is omitted.

次に、第２実施形態の始動手順を説明する。
１．電源を投入する。
２．接触器６Ｘが接続されてから、スター結線用接触器６が接続されることで、補償器ＫＣがスター結線され、補償器ＫＣを介した分電圧供給状態となる。このとき、先ず接触器６Ｘが接続されてから、スター結線用接触器６の接続が実行される、つまりスター結線用接触器６の接続が所定時間だけ遅延されるので、それまでは、電動機が無限大の抵抗器として作用する。この所定時間とは、突入電流が収束するまでの時間に相当し、５０又は６０［Hz］の場合、０.０２〜０.１［sec］程度である。
３．タイマーリレー２によって、シーケンス回路の電源が投入されてから所定時間（例えば０.２５［sec］）後に、スター結線用接触器６が遮断され、補償器ＫＣによってリアクトル回路が形成される。また、接触器４２Ｘが接続され、これは自己保持される。
４．短絡用接触器４２が接続され、全電圧へと移行する。 Next, the starting procedure of the second embodiment will be described.
1. Turn on the power.
2. When the star connection contactor 6 is connected after the contactor 6X is connected, the compensator KC is star-connected, and a voltage dividing state is provided via the compensator KC. At this time, the contactor 6X is first connected, and then the connection of the star connection contactor 6 is executed. That is, the connection of the star connection contactor 6 is delayed by a predetermined time. Acts as an infinite resistor. This predetermined time corresponds to the time until the inrush current converges, and is about 0.02 to 0.1 [sec] in the case of 50 or 60 [Hz].
3. After a predetermined time (for example, 0.25 [sec]) after the sequence circuit is turned on by the timer relay 2, the star connection contactor 6 is cut off, and a reactor circuit is formed by the compensator KC. A contactor 42X is connected and is self-held.
4). The short-circuit contactor 42 is connected and transitions to full voltage.

次に、第２実施形態の作用効果を説明する。
図２に示すように、実際に過大な突入電流が流れるのは１〜２周期の間で、それを過ぎれば収束することが分かる。
本実施形態では、電動機を始動する際、電源を投入してから所定時間が経過するまで、つまり突入電流が収束するまで、スター結線用接触器６の接続を遅延させることにした。これにより、スター結線用接触器６が接続されるまでは、電動機が無限大の抵抗器として作用し、前述した第１実施形態と同様に、過大な突入電流を抑制することができる。
したがって、接点の焼損や、過電流継電器のトリップを防止できる。
さらに、第１実施形態のように、電動機の定格電流に応じて、抵抗器Ｒの抵抗値を調整する過程を省略することができる。 Next, the function and effect of the second embodiment will be described.
As shown in FIG. 2, it can be seen that an excessive inrush current actually flows between 1 and 2 cycles, and then converges after that period.
In this embodiment, when starting the electric motor, the connection of the star connection contactor 6 is delayed until a predetermined time has elapsed since the power was turned on, that is, until the inrush current converges. Thereby, until the star connection contactor 6 is connected, the electric motor acts as an infinite resistor, and an excessive inrush current can be suppressed as in the first embodiment.
Therefore, contact burnout and overcurrent relay trip can be prevented.
Furthermore, the process of adjusting the resistance value of the resistor R according to the rated current of the electric motor as in the first embodiment can be omitted.

なお、第２実施形態では、スター結線用接触器６の接続を遅延させるために、接触器６Ｘの接続を経るだけの構成にしたが、勿論、タイマ回路によって遅延させてもよい。
また、第２実施形態では、補償器ＫＣにおける全ての相に、スター結線用接触器６を設けているが、これに限定されるものではない。要は、スター結線の中性点を接続／遮断できればよいので、少なくとも二相にスター結線用接触器６を設ければよい。つまり、これら二相のスター結線用接触器６を遮断すれば、必然的に残りの一相も中性点から遮断されることになるからである。 In the second embodiment, in order to delay the connection of the star connection contactor 6, only the contactor 6X is connected. However, of course, it may be delayed by a timer circuit.
In the second embodiment, the star connection contactor 6 is provided in all phases of the compensator KC. However, the present invention is not limited to this. In short, it is only necessary to connect / cut off the neutral point of the star connection. Therefore, the star connection contactor 6 may be provided in at least two phases. That is, if the two-phase star connection contactor 6 is cut off, the remaining one phase is inevitably cut off from the neutral point.

第１実施形態の概略構成とシーケンス回路である。It is a schematic structure and sequence circuit of 1st Embodiment. 従来の波形である。It is a conventional waveform. 突入電流を抑制した波形である。It is the waveform which suppressed inrush current. 第２実施形態の概略構成とシーケンス回路である。It is a schematic structure and sequence circuit of 2nd Embodiment.

符号の説明Explanation of symbols

ＫＣ 補償器（三相単巻変圧器）
５２ 主接触器
４２ 短絡用接触器
６ スター結線用接触器
Ｒ 抵抗器
６Ｒ 抵抗挿入用接触器 KC compensator (three-phase autotransformer)
52 Main contactor 42 Short contactor 6 Star connection contactor R Resistor 6R Resistor insertion contactor

Claims (2)

コンドルファ始動方式の減電圧始動装置において、
電源及び電動機の間に介挿され、スター結線された三相単巻変圧器と、該三相単巻変圧器における各相のコイル及び中性点の間に介挿されたスター結線用接触器と、該スター結線用接触器と並列に接続された抵抗器と、前記スター結線接触器と並列、且つ前記抵抗器と直列に接続された抵抗挿入用接触器と、
前記電動機を始動する際、前記抵抗挿入用接触器を接続することで前記三相単巻変圧器における各相のコイル及び中性点の間に前記抵抗器を挿入した回路を形成してから、電源の投入、及び前記スター結線用接触器の接続を順に行い、前記電源を投入したときの突入電流を前記抵抗器で抑制した後に、前記抵抗挿入用接触器、及び前記スター結線用接触器を遮断する制御手段と、を備えたことを特徴とする減電圧始動装置。 In the condorfa starting type reduced voltage starting device,
A three-phase autotransformer inserted between a power source and an electric motor and star-connected, and a contactor for star connection inserted between a coil and a neutral point of each phase in the three-phase autotransformer A resistor connected in parallel with the star connection contactor; a resistor insertion contactor connected in parallel with the star connection contactor and in series with the resistor;
When starting the electric motor, by forming a circuit in which the resistor is inserted between the coil and the neutral point of each phase in the three-phase autotransformer by connecting the resistor insertion contactor, power on, and the have sequentially line connections star connecting contactor, a rush current when charged with the power supply after suppression by the resistor, the resistor insertion contactor, and the star connecting contactor And a control means for cutting off the low voltage starting device. コンドルファ始動方式の減電圧始動装置において、
電源及び電動機の間に介挿され、スター結線された三相単巻変圧器と、該三相単巻変圧器のコイル及び中性点の間に介挿されたスター結線用接触器と、
前記電動機を始動する際、電源を投入してから突入電流が収束するまでの所定時間だけ前記スター結線用接触器の接続を遅延させることで前記電動機を抵抗器として作用させる制御手段と、を備えたことを特徴とする減電圧始動装置。 In the condorfa starting type reduced voltage starting device,
A three-phase autotransformer inserted between a power source and an electric motor and star-connected, and a star-connection contactor inserted between a coil and a neutral point of the three-phase autotransformer;
Control means for causing the electric motor to act as a resistor by delaying the connection of the star connection contactor for a predetermined time from when the power is turned on until the inrush current converges when starting the electric motor. A reduced voltage starting device characterized by that.
JP2006317139A 2006-11-24 2006-11-24 Reduced voltage starting device Expired - Fee Related JP4999154B2 (en)

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JP2011109858A (en) * 2009-11-19 2011-06-02 Denkoh Co Ltd Induction motor controller
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CN103296938B (en) * 2013-05-17 2016-09-28 兰州电机股份有限公司 Limited capacity power sources starts reactive power compensator and the using method of high power motor
CN104954000A (en) * 2015-04-14 2015-09-30 汪水仿 Method for using multiple relays to replace contactor
CN106452196B (en) * 2016-10-31 2018-07-17 中国核动力研究设计院 Motor start control circuit and control method
CN111371344A (en) * 2020-03-13 2020-07-03 上海外高桥造船有限公司 Starting circuit for autotransformer of three-phase motor

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