JPS62189920A - Protective device of electric equipment - Google Patents
Protective device of electric equipmentInfo
- Publication number
- JPS62189920A JPS62189920A JP2989486A JP2989486A JPS62189920A JP S62189920 A JPS62189920 A JP S62189920A JP 2989486 A JP2989486 A JP 2989486A JP 2989486 A JP2989486 A JP 2989486A JP S62189920 A JPS62189920 A JP S62189920A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- protection device
- capacitor
- electrical equipment
- surge absorber
- 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
- 230000001681 protective effect Effects 0.000 title description 2
- 239000003990 capacitor Substances 0.000 claims description 29
- 239000006096 absorbing agent Substances 0.000 description 25
- 230000006698 induction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 241001494479 Pecora Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、電源の遮断或は欠相時に生ずる過電圧から
電気機器馨保護する、電気機器の保護装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a protection device for electrical equipment that protects the electrical equipment from overvoltage that occurs when a power supply is cut off or an open phase occurs.
〈従来の技術〉
遅れ力率の負荷に対する電力回路の力率改善のために、
電力回路に進相コンデンサが接続されろことがある。こ
の場合、電力回路に線形の負荷が接続されれば問題はな
いが、非線形の遅れ力率負荷、例えば単相トランスのよ
うに過電圧時に非線形インダクタンスを有する低力率負
荷が接続されると、電源の遮断或は欠相時に鉄共振現象
Ｙ生ずることがある。<Prior art> To improve the power factor of a power circuit for a load with a lagging power factor,
A phase advance capacitor may be connected to the power circuit. In this case, there is no problem if a linear load is connected to the power circuit, but if a nonlinear lagging power factor load, such as a single-phase transformer with a low power factor load that has nonlinear inductance during overvoltage, is connected, the power supply Ferro-resonance phenomenon Y may occur when the phase is interrupted or the phase is open.
鉄共振現象が生じると、進相コンデンサや負荷に太ぎた
電圧が印加され、機器が損傷し場合によっては焼損によ
り火災が発生するおそれもある。When a fero-resonance phenomenon occurs, a large voltage is applied to the phase-advance capacitor and the load, which can damage equipment and even cause a fire due to burnout.
この鉄共振による過電圧乞吸収するために、低力率負荷
が接続されている電力回路に、過電圧保護装置所領サー
ジアブソーバが接続され、このサージアブソーバで鉄共
振による過電圧乞吸収する方式が採用されている。In order to absorb the overvoltage caused by this iron resonance, a surge absorber equipped with an overvoltage protection device is connected to the power circuit to which the low power factor load is connected, and a method is adopted in which this surge absorber absorbs the overvoltage caused by the iron resonance. There is.
しかし、この方式Ｙ採用しても、鉄共振が太きがったり
或は短時間に断続して鉄共振が発生すると、サージアブ
ソーバのエネルギ耐量を越えて、サージアブソーバが破
壊されることがある。However, even if this method Y is adopted, if the ferro-resonance becomes thick or ferro-resonance occurs intermittently in a short period of time, the energy capacity of the surge absorber may be exceeded and the surge absorber may be destroyed. .
このため忙、特開昭５８−１０７０２０号公報に開示さ
れているように、開閉装置をサージアブソーバ釦並列に
接続した方式のものが提案されている。この方式では、
サージアブソーバに流れる電流馨検出し、この電流値が
所定値乞越えると開閉袋ｒＩｔ′ｌ￥閉路し、サージア
ブソーバ側にエネルギ耐量の電流が流れないようにする
ことが出来ろ。For this reason, a system has been proposed in which a switchgear is connected in parallel to a surge absorber button, as disclosed in Japanese Patent Application Laid-Open No. 58-107020. In this method,
It is possible to detect the current value flowing in the surge absorber, and when this current value exceeds a predetermined value, the opening/closing bag rIt'l\\circuit is closed to prevent the current withstand energy from flowing to the surge absorber side.
〈発明が解決しようとする問題点〉
しかし、この提案されている方式では、進相コンデンサ
と低力率負荷による鉄共振現象の過電圧が、サージアブ
ソーバ以外の電気機器に及ぼす悪影響については、何ら
の配慮もされていない。このために、鉄共振現象で生じ
る過電圧がサージアブソーバで吸収されずに、他の電気
機器に与えられて電気機器が損傷したり、場合によって
は焼損事故による火災発生が誘起されることがある。<Problems to be Solved by the Invention> However, in this proposed method, there is no possibility that overvoltage caused by the ferroresonance phenomenon caused by the phase advance capacitor and the low power factor load will have any adverse effects on electrical equipment other than the surge absorber. No consideration was given. For this reason, the overvoltage generated by the fero-resonance phenomenon is not absorbed by the surge absorber and is applied to other electrical equipment, causing damage to the electrical equipment or, in some cases, inducing a fire due to a burnout accident.
この発明は、このような従来の電気機器の保護袋！ｔに
おける現状に鑑みてなされたものであり、その目的は電
源の遮断或は欠相時に生ずる鉄共振現象により、電気機
器が破壊するのを防止可能な、電気機器の保護装置を提
供することにある。This invention is a protective bag for conventional electrical equipment! The purpose was to provide a protection device for electrical equipment that can prevent electrical equipment from being destroyed due to the ferro-resonance phenomenon that occurs when the power is cut off or when a phase is lost. be.
〈問題点を解決するための手段〉
この発明の電気機器の保護装置は、三相交流電源に接続
された進相コンデンサと三相交流電源に接続され非線形
インダクタンスを有する低力率負荷と低力率負荷に対す
る過電圧保護装置とを具備している。この発明では、計
測手段が設けられ、この計測手段によって過電圧保護装
置に流れる電流が計測される。一方、計測手段の出力に
基づいて過電圧保護装置のエネルギ耐量を演算する演算
処理装置が設けられ、計測手段の出力がエネルギ耐量に
達すると遮断信号を出力する遮断信号発生手段が、演算
処理装置（設けられている。<Means for Solving the Problems> The electrical equipment protection device of the present invention has a phase advance capacitor connected to a three-phase AC power supply, a low power factor load connected to the three-phase AC power supply and having a nonlinear inductance, and a low power It is equipped with an overvoltage protection device for high load. In this invention, a measuring means is provided, and the current flowing through the overvoltage protection device is measured by the measuring means. On the other hand, an arithmetic processing device is provided which calculates the energy withstand capacity of the overvoltage protection device based on the output of the measuring means, and a cut-off signal generating means which outputs a cut-off signal when the output of the measuring means reaches the energy withstand capacity is provided with the arithmetic processing device ( It is provided.
また、この発明では遮断信号発生手段の遮断信号で、進
相コンデンサを三相交流電源から切離す切離手段が設け
られる。Further, in the present invention, a disconnection means is provided for disconnecting the phase advancing capacitor from the three-phase AC power supply in response to a cutoff signal from the cutoff signal generating means.
〈作 用〉
この発明の電気機器の保護装置では、過電圧保護装置に
流れる電流が計測手段で計測され、演算処理装置が、計
測電流値が過電圧保護装置の設定されたエネルギ耐量で
あるか否かを演算し、判定する。計測手段で計測される
電流が過電圧保護装置のエネルギ耐量に達すると、遮断
信号発生手段が作動し、遮断信号が発生し切離手段が作
動して、進相コンデンサが三相交流電源から切離される
。<Function> In the electrical equipment protection device of the present invention, the current flowing through the overvoltage protection device is measured by the measuring means, and the arithmetic processing device determines whether the measured current value is within the set energy withstand capacity of the overvoltage protection device. Calculate and judge. When the current measured by the measuring means reaches the energy withstand capacity of the overvoltage protection device, the cutoff signal generation means is activated, a cutoff signal is generated, the disconnection means is activated, and the phase advance capacitor is disconnected from the three-phase AC power supply. It will be done.
従って、進相コンデンサと低力率負荷による鉄共振現象
が阻止され、この鉄共振現象による過電圧が、電気機器
に印加されて電気機器が損傷し又焼損する事故が防止さ
れる。Therefore, the ferro-resonance phenomenon caused by the phase advance capacitor and the low power factor load is prevented, and an accident in which overvoltage due to the ferro-resonance phenomenon is applied to the electrical equipment and causes damage or burnout of the electrical equipment is prevented.
〈実施例〉
以下この発明の電気機器の保護装置を、その実施例（基
づき図面を使用して詳細に説明する。<Example> Hereinafter, the protection device for electrical equipment of the present invention will be described in detail based on the example (based on the drawings).
第１図は、この発明の実施例の構成を示すもので、実施
例は非線形インダクタンスを有する低力率負荷として、
サイリスタレオナード方式エレベータが接続された場合
である。FIG. 1 shows the configuration of an embodiment of the present invention, in which the embodiment is a low power factor load having nonlinear inductance.
This is the case when a thyristor Leonard type elevator is connected.
三相交流電源の各相線Ｕ、Ｖ、Ｗが、それぞれ遮断器！
−１，１−２，１−３を介して、導出される。相線Ｕは
、サイリスタ２−１の陽極側とサイリスタ２−２の陰極
側との接続点に接続される。Each phase line U, V, and W of a three-phase AC power supply is a circuit breaker!
-1, 1-2, 1-3. The phase wire U is connected to a connection point between the anode side of the thyristor 2-1 and the cathode side of the thyristor 2-2.
同様にして、相線■はサイリスタ２−３とサイリスタ２
−４との接続点に、相線Ｗはサイリスタ２−５とサイリ
スタ２−６との接続点に接続される。Similarly, phase wire ■ connects thyristor 2-3 and thyristor 2.
-4, and the phase wire W is connected to the connection point between thyristor 2-5 and thyristor 2-6.
サイリスタ２−１．２−３及び２−５の陰極側が互に接
続されて制御装置２の一端とされる。同様にして、サイ
リスタ２−２．２−４及び２−６の陽極側が互に接続さ
れて制御装置２の他端とされる。The cathode sides of the thyristors 2-1, 2-3 and 2-5 are connected to each other to form one end of the control device 2. Similarly, the anode sides of the thyristors 2-2, 2-4 and 2-6 are connected to each other to form the other end of the control device 2.
制御装置２の一端と他端間に、誘導電動機３が接続され
る。この誘導電動機３に対して、両端に重り５と乗かご
６とが連結されたローブ２０が巻装されたシープ４が、
電気的（接続されている。An induction motor 3 is connected between one end and the other end of the control device 2 . A sheep 4 is wrapped around the induction motor 3 with a lobe 20 having a weight 5 and a car 6 connected to both ends.
electrically (connected)
従って、制御装置２のサイリスタを位相制御し、誘導電
動機３の固定子巻線に流れる電流を制御することにより
、シープ４を回転させて乗かご６を運転させることが出
来る。Therefore, by controlling the phase of the thyristor of the control device 2 and controlling the current flowing through the stator winding of the induction motor 3, the sheep 4 can be rotated and the car 6 can be driven.
遮断器１−１．１−□２．１−３の後段において、各相
線Ｕ、Ｖ、Ｗは、それぞれ遮断器１０−１゜１０−２．
１０−３を介して、高調波抑制用のりアクドル９−１．
９−２． ９−３の一端に接続される。リアクトル９
−１及び９−２の他端間に、力率改善用の進相コンデン
サ８−１が接続される。At the subsequent stage of circuit breaker 1-1.1-□2.1-3, each phase line U, V, W is connected to circuit breaker 10-1°10-2.
10-3, a harmonic suppression glue handle 9-1.
9-2. Connected to one end of 9-3. Reactor 9
A phase advancing capacitor 8-1 for power factor improvement is connected between the other ends of -1 and 9-2.
同様にして、リアクトル９−１及び９−３間に、力率改
善用の進相コンデンサ８−２が、またリアクトル９−２
及び９−３間に、力率改善用の進相コンデンサ８−３が
接続される。Similarly, a phase advancing capacitor 8-2 for power factor improvement is connected between reactors 9-1 and 9-3.
A phase advancing capacitor 8-3 for power factor improvement is connected between and 9-3.
遮断器１−１及び１０−１の接続点と遮断器１−２及び
】０−２の接続点間に、サージアブソーバ７−１が接続
される。遮断器１−１及び１〇−１の接続点と遮断器１
−３及び１０−３の接続点間に、サージアブソーバ７−
２が接続される。また、遮断器１−２及び１０−２の接
続点と遮断器１−３及び１０−３の接続点間に、サージ
アブソーバ７−３が接続される。A surge absorber 7-1 is connected between the connection point of the circuit breakers 1-1 and 10-1 and the connection point of the circuit breakers 1-2 and 0-2. Connection point of circuit breaker 1-1 and 10-1 and circuit breaker 1
- between the connection points of 3 and 10-3, surge absorber 7-
2 is connected. Further, a surge absorber 7-3 is connected between the connection point between the circuit breakers 1-2 and 10-2 and the connection point between the circuit breakers 1-3 and 10-3.
サージアブソーバ７−１． ７−２． ７−３に流れる
電流を検出する変流器１１が設けられ、変流器１１の出
力端子（演算処理袋！ｔ１２が接続される。実施例では
、サージアブソーバ７−１．７−２．７−３が過電圧保
護装置を構成し、変流器１１が計測手段を構成している
。Surge absorber 7-1. 7-2. A current transformer 11 is provided to detect the current flowing through the current transformer 7-3, and the output terminal (operation processing bag!t12) of the current transformer 11 is connected. In the embodiment, the surge absorber 7-1.7-2.7 -3 constitutes an overvoltage protection device, and current transformer 11 constitutes a measuring means.
演算処理装置ｌ１２の出力端子には、変流器１１で計測
される電流値が、サージアブソーバ７−１゜７−２．
７−３のエネルギ耐量に達すると作動する切離手段で励
起する引きはずしコイル１４が接続されている。The current value measured by the current transformer 11 is transmitted to the output terminal of the arithmetic processing unit l12 from the surge absorber 7-1, 7-2.
A trip coil 14 is connected which is excited by a disconnection means which is activated when the energy withstand capacity of 7-3 is reached.
第２図は演算処理装置１１２の一例を示し、演算処理袋
＃１２の入力端子１１．１２間にインピーダンス素子２
１が接続され、インピーダンス素子２１０両端がダイオ
ードブリッジ１２ａの入力端に接続される。ダイオード
ブリッジ１２ａの出力端は、抵抗１２ｂ及び１２ｃの接
続点に接続され、抵抗１２ｂの他端はアースされる。FIG. 2 shows an example of the arithmetic processing unit 112, and an impedance element 2 is connected between the input terminals 11 and 12 of the arithmetic processing bag #12.
1 is connected, and both ends of the impedance element 210 are connected to the input end of the diode bridge 12a. The output end of the diode bridge 12a is connected to the connection point of the resistors 12b and 12c, and the other end of the resistor 12b is grounded.
抵抗１２Ｃの他端と大地間に、コンデンサ１２ｄが接続
され、抵抗１２Ｃとコンデンサ１２ｄとの接続点にダイ
オード２２の陰極側が接続され、ダイオード２２の陽極
側はアースされる。A capacitor 12d is connected between the other end of the resistor 12C and the ground, the cathode side of the diode 22 is connected to the connection point between the resistor 12C and the capacitor 12d, and the anode side of the diode 22 is grounded.
コンデンサ！２ｄとダイオード２２との接続点に、ダイ
オード２３の陽極側が接続され、ダイオード２３の陰極
側は抵抗２４を介して、比較器１２ｆの一方の入力端子
に接続される。比較器１２ｆの一方の入力端子に、抵抗
２５及び可変抵抗器１２ｅの一端が接続される。Capacitor! The anode side of the diode 23 is connected to the connection point between the diode 2d and the diode 22, and the cathode side of the diode 23 is connected via a resistor 24 to one input terminal of the comparator 12f. A resistor 25 and one end of a variable resistor 12e are connected to one input terminal of the comparator 12f.
抵抗２５の他端は、所定のバイアス電圧端子に接続され
、可変抵抗器１２ｅの他端はアースされる。可変抵抗器
１２ｅの摺動端子が、比較器１２ｆの他の入力端子に接
続される。比較器１２ｆの一方の入力端子と比較器１２
ｆの出力端子間に、インピーダンス素子２６が接続さ
れる。The other end of the resistor 25 is connected to a predetermined bias voltage terminal, and the other end of the variable resistor 12e is grounded. A sliding terminal of variable resistor 12e is connected to the other input terminal of comparator 12f. One input terminal of the comparator 12f and the comparator 12
An impedance element 26 is connected between the output terminals of f.
比較器１２ｆの出力端子に抵抗２７の一端が接続され、
抵抗２７の他端と大地間に抵抗２８が接続され、抵抗２
８と並列にコンデンサ２９が接続される。コンデンサ２
９と抵抗２７との接続点に、トランジスタ１２ｇのペー
スが接続され、トランジスタ１２ｇのエミッタはアース
される。One end of a resistor 27 is connected to the output terminal of the comparator 12f,
A resistor 28 is connected between the other end of the resistor 27 and the ground, and the resistor 28
A capacitor 29 is connected in parallel with 8. capacitor 2
The conductor of the transistor 12g is connected to the connection point between the transistor 9 and the resistor 27, and the emitter of the transistor 12g is grounded.
トランジスタ１２ｇのコレクタにリレー１２ｈの一端が
接続され、リレー１２ｈの他端には所定のバイアス電源
からの電圧が印加さねている。リレーの接点１２にで生
ずる信号により、引きはずしコイル１４が作動するよう
に構成される。One end of a relay 12h is connected to the collector of the transistor 12g, and a voltage from a predetermined bias power source is not applied to the other end of the relay 12h. A trip coil 14 is arranged to be actuated by a signal produced at the relay contacts 12.
エレベータの運転状態において、何らかの原因で遮断器
１−１． １−２． １−３が遮断した場合。During the operation of the elevator, for some reason the circuit breaker 1-1. 1-2. When 1-3 is cut off.
成り三相交流電源の一相又は二相が欠相になった場合に
は、非線形インダクタンスと進相コンデンサ８−１．
８−２． ８−３間で鉄共振が発生する。If one or two phases of the three-phase AC power supply become open-phase, the nonlinear inductance and the phase advance capacitor 8-1.
8-2. Ferro resonance occurs between 8 and 3.
非線形インダクタンスなＬｒ、進相コンデンサの容量な
ｃｒとすると、ｆｒ＝ｌ／２ｒｕなる周波数で過電圧が
連続的に発生する。もし、抵抗などのエネルギ消費源が
存在しないと、この過電圧により周波数ｆｒの振動が永
久に持続する。When Lr is a nonlinear inductance and cr is a capacitance of a phase advancing capacitor, an overvoltage occurs continuously at a frequency of fr=l/2ru. If an energy consumption source such as a resistor were not present, this overvoltage would cause the oscillation at frequency fr to continue forever.
サージアブソーバが接続されていると、サージアブソー
バによって成る程度の電圧は吸収されるが、過電圧が大
きく又は連続的に継続すると、サージアブソーバのエネ
ルギ耐量以上の過電圧エネルギとなり、サージアブソー
バが破壊することがある。When a surge absorber is connected, the surge absorber absorbs a certain amount of voltage, but if the overvoltage is large or continues continuously, the overvoltage energy will exceed the surge absorber's energy withstand capacity, and the surge absorber may be destroyed. be.
この発明では第２図に構成を示す演算処理装置１２に、
第１図に示す変流器１１に流れる電源Ｉｉが入力され、
ダイオードブリッジ１２ａで電圧信号に変換され、抵抗
１２ｃとコンデンサ１２ｄが構成する積分回路で積分さ
れる。In this invention, the arithmetic processing device 12 whose configuration is shown in FIG.
Power supply Ii flowing into the current transformer 11 shown in FIG. 1 is input,
The voltage signal is converted into a voltage signal by the diode bridge 12a, and integrated by an integrating circuit constituted by a resistor 12c and a capacitor 12d.
コンデンサ１２ｄは充電され、その放電の時定数は抵抗
１２ｃと１２ｂＫより大きな値に設定されているので、
充電電圧が保持される。このような状態で、変流器１１
がさらに電流Ｉｉを検出し、この電流Ｉｉが演算処理袋
ｆｆ１ｌ１２に入力すると。Since the capacitor 12d is charged and its discharge time constant is set to a larger value than the resistors 12c and 12bK,
Charging voltage is maintained. In this state, the current transformer 11
further detects the current Ii, and this current Ii is input to the arithmetic processing bag ff1l12.
コンデンサ１２ｄの充電電圧が増大して行く。The charging voltage of the capacitor 12d increases.
可変抵抗器１２ｅの摺動端子により、所定の基準電圧が
設定されて比較器１２ｆの他の入力端子に与えられてい
る。A predetermined reference voltage is set by the sliding terminal of the variable resistor 12e and applied to the other input terminal of the comparator 12f.
この基準電圧は、サージアブソーバ７−１．７−２．７
−３のエネルギ耐量に対応した値となるように、予め設
定されている。This reference voltage is the surge absorber 7-1.7-2.7
The value is set in advance to correspond to the energy tolerance of −3.
コンデンサ１２ｄの充電電圧が、この基準電圧を越える
と比較器１２ｆの出力端子に遮断信号が発生する。即ち
実施例では、比較器１２ｆで遮断信号発生手段が構成さ
れている。比較器１２ｆの出力端子に得られた遮断信号
がトランジスタ１２ｇのペースに与えられ、トランジス
タ１２ｇが導通してリレー１２ｈが作動する。When the charging voltage of capacitor 12d exceeds this reference voltage, a cutoff signal is generated at the output terminal of comparator 12f. That is, in the embodiment, the comparator 12f constitutes a cutoff signal generating means. The cutoff signal obtained at the output terminal of comparator 12f is applied to the pace of transistor 12g, transistor 12g becomes conductive, and relay 12h is activated.
実施例においては、リレー１２ｈが切離手段を構成し、
リレー１２ｈが作動することによって接点１２Ｋが閉じ
、接点１２Ｋが閉じることによって生ずる電気信号で引
きはずしコイル１４が作動する。引きはずしコイル１４
が作動すると、遮断器１０−１．１０−２．１０−３が
遮断動作を行ない、進相コンデンサ８−１． ８−２．
８−３が三相交流電源から切離される。In the embodiment, the relay 12h constitutes the disconnection means,
When the relay 12h is activated, the contact 12K is closed, and the trip coil 14 is activated by the electric signal generated by the closing of the contact 12K. Tripping coil 14
When activated, the circuit breakers 10-1.10-2.10-3 perform a breaking operation, and the phase advance capacitors 8-1. 8-2.
8-3 is disconnected from the three-phase AC power supply.
このようにして、鉄共振現象で生じる過電圧がサージア
ブソーバのエネルギ耐量を越えると、進相コンデンサが
三相交流電源から切離されるので、サージアブソーバで
吸収されない過電圧が他の電気機器を損傷したり、或は
焼損したりする事故が防止される。即ち、演算処理装置
によって、サージアブソーバに流れる電流と継続時間の
積が所定値を越えるか、所定レベルの電流が所定時間継
続して流れるか、或は断続的九発生した電流とその継続
時間の積の総合が所定値を越えると、進相コンデンサが
三相交流電源から切離される。In this way, when the overvoltage generated by the ferroresonance phenomenon exceeds the energy withstand capacity of the surge absorber, the phase advance capacitor is disconnected from the three-phase AC power supply, so the overvoltage that is not absorbed by the surge absorber can damage other electrical equipment. , or accidents such as burnout are prevented. That is, the arithmetic processing unit determines whether the product of the current flowing through the surge absorber and its duration exceeds a predetermined value, or whether a current at a predetermined level continues to flow for a predetermined time, or whether the product of the current that flows intermittently and its duration exceeds a predetermined value. When the sum of the products exceeds a predetermined value, the phase advance capacitor is disconnected from the three-phase AC power supply.
〈発明の効果〉
以上詳細に説明したよう罠、この発明によると進相コン
デンサと非線形インダクタンスを有し、低力率負荷が接
続された三相交流電源回路で、電源遮断や欠相で生じる
鉄共振現象による過電圧が、サージアブソーバのエネル
ギ耐量を越えると進相コンデンサが電源から遮断され、
電気機器に対する損傷や焼損事故の発生を防止すること
が可能な。<Effects of the Invention> As explained in detail above, according to the present invention, in a three-phase AC power supply circuit that has a phase advance capacitor and a nonlinear inductance and is connected to a low power factor load, it is possible to reduce the When the overvoltage caused by the resonance phenomenon exceeds the energy withstand capacity of the surge absorber, the phase advance capacitor is cut off from the power supply.
It is possible to prevent damage to electrical equipment and burnout accidents.
電気機器の保護装置を提供することが出来る。It is possible to provide a protection device for electrical equipment.
第１図は、この発明の実施例の構成を示す回路図、第２
図は、この発明の実施例における演算処理装置の構成を
示す回路図である。
１−ｔ、 １−２． １−３・・・・・・遮断器、２
・・・・・・制御装置、２−１〜２−６・・・・・・サ
イリスタ、３・・・・・・誘導電動機、７−１． ７−
２．７−３・・・用サージアブソーバ、８−１．８−２
．８−３・・・・・・進相コンデンサ、１０−１．１０
−２．１０−３・・・・・・遮断器、１１・・・・・・
変流器、１２・・・・・・演算処理装置。FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a circuit diagram showing the configuration of an arithmetic processing device in an embodiment of the present invention. 1-t, 1-2. 1-3...Breaker, 2
...Control device, 2-1 to 2-6...Thyristor, 3...Induction motor, 7-1. 7-
Surge absorber for 2.7-3..., 8-1.8-2
．． 8-3... Phase advance capacitor, 10-1.10
-2.10-3... Breaker, 11...
Current transformer, 12... Arithmetic processing unit.
Claims (1)
交流電源に接続され、非線形インダクタンスを有する低
力率負荷と、この低力率負荷に対する過電圧保護装置と
を有する電気機器の保護装置において、前記過電圧保護
装置に流れる電流を計測する計測手段と、この計測手段
の出力に基づき、前記過電圧保護装置のエネルギ耐量を
演算する演算処理装置と、この演算処理装置に設けられ
、前記計測手段の出力が前記エネルギ耐量に達すると、
遮断信号を出力する遮断信号発生手段と、この遮断信号
発生手段の遮断信号で前記進相コンデンサを前記三相交
流電源から切離す切離手段とを有することを特徴とする
電気機器の保護装置。In a protection device for electrical equipment, which includes a phase advance capacitor connected to a three-phase AC power supply, a low power factor load connected to the three-phase AC power supply and having a nonlinear inductance, and an overvoltage protection device for the low power factor load. , a measuring means for measuring the current flowing through the overvoltage protection device; a processing device for calculating the energy withstand capacity of the overvoltage protection device based on the output of the measuring device; When the output reaches the energy tolerance,
1. A protection device for electrical equipment, comprising: a cutoff signal generating means for outputting a cutoff signal; and a disconnection means for separating the phase advancing capacitor from the three-phase AC power source using the cutoff signal from the cutoff signal generating means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2989486A JPS62189920A (en) | 1986-02-15 | 1986-02-15 | Protective device of electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2989486A JPS62189920A (en) | 1986-02-15 | 1986-02-15 | Protective device of electric equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62189920A true JPS62189920A (en) | 1987-08-19 |
| JPH0318413B2 JPH0318413B2 (en) | 1991-03-12 |
Family
ID=12288678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2989486A Granted JPS62189920A (en) | 1986-02-15 | 1986-02-15 | Protective device of electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62189920A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017085805A (en) * | 2015-10-29 | 2017-05-18 | 株式会社富士通ゼネラル | Air conditioner |
-
1986
- 1986-02-15 JP JP2989486A patent/JPS62189920A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017085805A (en) * | 2015-10-29 | 2017-05-18 | 株式会社富士通ゼネラル | Air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0318413B2 (en) | 1991-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7035066B2 (en) | Arc-default detecting circuit breaker system | |
| US3619721A (en) | Triggered vacuum gap keep-alive circuit | |
| CA2178862C (en) | Power converter protective apparatus using mechanical and semiconductor bypass means | |
| JPH05501043A (en) | Loss of neutral or ground protection circuit | |
| US5453901A (en) | Detection and protection of excitation system from diode failure | |
| US4922364A (en) | Series capacitor equipment | |
| JP3455797B2 (en) | Power converter | |
| US4855859A (en) | Detection device for detecting transitions to the normal state in a superconducting winding, in particular for generating electricity, and a protection device for protecting such a winding | |
| WO2011070235A1 (en) | Electronic protection circuit and protection device | |
| JPS62189920A (en) | Protective device of electric equipment | |
| RU2284083C2 (en) | Device for compensation of one-phased capacity closing currents and for limiting internal overvoltages in high-voltage networks | |
| JPS63290122A (en) | Overcurrent releasing device for breaker | |
| JPH11275872A (en) | Overvoltage protective device for capacitor of power conversion circuit | |
| CN219979307U (en) | Leakage transformer and circuit breaker | |
| US3614532A (en) | Triggered vacuum gap keep-alive circuit | |
| JPS6321152Y2 (en) | ||
| SU107164A1 (en) | Device for the protection of asynchronous electric motors | |
| SU1136251A1 (en) | Device for earthing neutral in system with low fault-to-earth current | |
| CN2313320Y (en) | Electronic over-current protector | |
| RU2204878C1 (en) | Electric motor phase-failure and supply-voltage unbalance protective device | |
| SU982137A1 (en) | Device for protection of three-phase electric motor | |
| JPS6344909Y2 (en) | ||
| JPH0582124B2 (en) | ||
| SU1116490A1 (en) | Device for protective de-energization of three-phase a.c.installation | |
| JP3248154B2 (en) | DC high-speed vacuum circuit breaker |