JPS58172923A - Current unbalance detector - Google Patents
Current unbalance detectorInfo
- Publication number
- JPS58172923A JPS58172923A JP5104482A JP5104482A JPS58172923A JP S58172923 A JPS58172923 A JP S58172923A JP 5104482 A JP5104482 A JP 5104482A JP 5104482 A JP5104482 A JP 5104482A JP S58172923 A JPS58172923 A JP S58172923A
- Authority
- JP
- Japan
- Prior art keywords
- current
- phase
- power supply
- voltage signal
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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】
本発明は３相交流電源の各相の電流の不平衡量を検出し
、欠相又は負荷の単相運転を検知して、電′ｓＥＬび負
荷の焼損等を防止する電流不平衡検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention detects the unbalanced amount of current in each phase of a three-phase AC power supply, detects an open phase or single-phase operation of the load, and prevents burnout of the load, etc. This invention relates to a current imbalance detection device.
一般に電動機保護用に従来から３相平鞠電ｄＬＫ対して
は、始動電流で動作しないような限時動作の過負ｍ検出
要素と、欠相運転を検出する欠相構出要素から構成され
る２Ｅ形、更に相回転が逆接続されるのを検出する反相
要素を有する３Ｅ形継電器等が使用されている。In general, for three-phase flat electric dLK for motor protection, the 2E consists of an overload detection element with a time-limited operation that does not operate with the starting current, and an open-phase configuration element that detects open-phase operation. Type 3E relays, etc., are used, which have an anti-phase element that detects when the phase rotation is reversely connected.
しかしながら、各相の電ｆｌｌＫいちじるしい不平衡を
生じた場合、２Ｅ、３Ｅ形継電器ではこれら各相の電流
の不平衡を検出できず、電源や負荷の焼損を防止できな
いといりた欠点を有していた。However, if there is a significant unbalance in the currents in each phase, the 2E and 3E relays have the disadvantage that they cannot detect the unbalance in the currents in each phase and cannot prevent burnout of the power supply or load. Ta.
本発明は上記欠点を除去するため、３相交流電確と負荷
との闇で各相の電流の不平衡量を検出し、この不平１１
ｉＩ鰍があらかじめ設定された値以上になりた場合ｖ＠
＠ｖ５にしたり、電源を遣欧させる信号を出力する電流
不平ｌｉ検出装置を提供することを目的とするものであ
る。In order to eliminate the above-mentioned drawbacks, the present invention detects the unbalanced amount of current in each phase between the three-phase AC power supply and the load.
If iI is equal to or higher than the preset value v@
The object of the present invention is to provide a current fault detection device that outputs a signal that causes the power supply to change to @v5 or to change the power supply to Europe.
以下１本発明の一実施例を図面な参関して説明する。An embodiment of the present invention will be described below with reference to the drawings.
図ｒおいて、ｌは３相交流電諒、２は３相交流電源１の
各相の電流を検知する電流交換器、３は３相交流電−Ｉ
Ｋ接続された負荷である。４，５．６は一端が電流変換
器２に接続され他端は短絡されていて、各相の電流を交
流電圧信号に変換する検出用抵抗、７．８．９は、それ
ぞれ検出用抵抗４，５．６と電流変換器２との接続側に
接続され、検出用抵抗４，５．６から交流電圧信号を入
力し整流と増幅を行ない整流回路１３に整流された信号
を出力する整流増幅回路である。１０，１１゜１２は、
整流増幅回路７，８．９の出力＠にそれぞれ接続され整
流増幅回路ｙ、ｓ、ｓよりの整流された信号を平滑する
コンデンサである。ｘ３＋！９１流回路で並列に検出用
抵抗１４が接続されていて。In figure R, l is a three-phase AC power supply, 2 is a current exchanger that detects the current of each phase of the three-phase AC power supply 1, and 3 is a three-phase AC power supply I.
K is a connected load. 4, 5.6 are connected to the current converter 2 at one end and short-circuited at the other end, and are used to convert the current of each phase into an AC voltage signal. 7.8.9 are each a detection resistor 4. , 5.6 and the current converter 2, and inputs the AC voltage signal from the detection resistors 4 and 5.6, rectifies and amplifies it, and outputs the rectified signal to the rectifier circuit 13. It is a circuit. 10,11°12 is
These capacitors are connected to the outputs of the rectifier amplifier circuits 7, 8, and 9, respectively, and smooth the rectified signals from the rectifier amplifier circuits y, s, and s. x3+! A detection resistor 14 is connected in parallel with the 91 current circuit.
コンデンサ１０ 、１１ 、１２より入力する直流電圧
に不平衡ある場合に検出用紙１ｔ４Ｋｔｉｔを流す、検
出用抵抗１４の両端には差動増幅器ＩｓがｉＩ妖されて
いて、検出用抵抗１４の両端の電圧差を増幅する。 １
（１は比較器で差動増幅器ＩＳで増幅された電圧と、設
定器１７にあらかじめ不平衡の許容値として設定された
値を比較し、差動増幅器１ｓよりの出力が大の１１
場合、電流不平衡が許蓉値を超えたと見なし、警報回路
１８を作動させたり、電源をし中断させる信号を出力す
る。A differential amplifier Is is connected to both ends of the detection resistor 14, which flows the detection paper 1t4Ktit when there is unbalance in the DC voltage input from the capacitors 10, 11, and 12, and the voltage across the detection resistor 14 is Amplify the difference. 1
(1 is a comparator that compares the voltage amplified by the differential amplifier IS with the value set in advance as an unbalance tolerance value in the setting device 17, and if the output from the differential amplifier 1s is large, the current It is assumed that the unbalance exceeds the permissible value, and a signal is output to activate the alarm circuit 18 or turn on and interrupt the power supply.
次に以上の構成を有する電流不平衡検出１ｋｌｆの作用
について説明する。Next, the operation of the current imbalance detection 1klf having the above configuration will be explained.
３相交流劃１と負荷１の中間に位置した電流変換Ｗｈ２
で検知した相電流は検出用抵抗４，５゜６で交流電圧信
号に変換され、整流槽ｍ回路７゜！１，９１１ｒより整
流と増幅を行う、！ｌｆｉ増幅回路７．８．９により整
流された信号（電流値）はコンデンサ１０ 、１１ 、
１１ Ｋよりそれぞれ平滑され整流回路１３ｆｆ出力さ
れる。整流回路１３はコンデンサ１０、１１ 、１２か
ら［？ＩＬ電圧を入力し、この［ｆｉ電圧に不平衡ある
場合に横出用抵抗１４に電流を流す。Current conversion Wh2 located between 3-phase AC field 1 and load 1
The phase current detected by is converted into an AC voltage signal by the detection resistor 4,5゜6, and the rectifier tank m circuit 7゜! Rectification and amplification are performed from 1,911r! The signal (current value) rectified by the lfi amplifier circuit 7.8.9 is sent to the capacitors 10, 11,
11K and are smoothed and outputted from the rectifier circuit 13ff. The rectifier circuit 13 is connected to capacitors 10, 11, and 12 [? The IL voltage is input, and if the [fi voltage is unbalanced, current is passed through the side output resistor 14.
４峡出用抵抗１４に電流が流れると差動増幅器Ｉｓが検
出用抵抗１４の一端の電圧差を増幅する。比較器１６で
は、差動増−６１１で増幅された電圧と設定器１７にあ
らかじめ不平衡の許１！１１として設定された値を比較
し、差動増ｆｓ＠ｔｓよりの出力の方が大きくなった時
、電流不平衡が許！Ｖ値を超えたと見なし、警４１回路
１８を作動させたり、電源をし中断させる信号を出力す
る。When a current flows through the four-way output resistor 14, the differential amplifier Is amplifies the voltage difference at one end of the detection resistor 14. The comparator 16 compares the voltage amplified by the differential amplifier 611 with the value preset in the setting device 17 as an unbalance allowance of 1!11, and determines that the output from the differential amplifier fs@ts is larger. When , current unbalance is allowed! It is assumed that the V value has been exceeded, and a signal is output to activate the alarm 41 circuit 18 or turn on and interrupt the power supply.
なお、本発明の電流不平実検出ｉ＊は、整流増幅回路７
，８．９の増幅度を調整することによってあらかじめ電
流不平衡のある負４ｉ９にも使用できることは自明であ
る。Note that the current imbalance actual detection i* of the present invention is performed by the rectifier amplifier circuit 7.
, 8.9, it is obvious that it can also be used for a negative 4i9 with current imbalance in advance.
本発明は以上のように、３相交流電源と負荷との闇で、
各相の電流を検知して交流電圧信号に変換し、この交流
電圧信号を整流、平滑して［＋１電圧信号に変換し、こ
の直流電圧信号に変換された各相の電流値の不平衡量を
検出し、この検出“された不平衡量があらかじめ設定さ
れた許容値以上になりた場合に警報を発したり、電源を
しゃ断するよ５Ｋしているので、電源や負荷の焼損を防
止できる等その産業上の効果は大である。As described above, the present invention works in the dark between the three-phase AC power supply and the load.
The current in each phase is detected and converted into an AC voltage signal, and this AC voltage signal is rectified and smoothed to convert it into a +1 voltage signal, and the unbalance amount of the current value of each phase converted to this DC voltage signal is If the detected unbalance amount exceeds a preset allowable value, an alarm will be issued and the power will be cut off. This prevents burnout of the power supply and load, etc. The above effect is significant.
図は本５ｉ＠の一実施例を示す回路図である。
ｌ・・・３相交流電源、２・・・電流変換器、３・・・
負荷、４．５，１ｉ−−・検出用抵抗、？、８．９・・
・整流増幅回路、１０ 、１１．１２・・−コンデンサ
、１３・−！１１ｆＩＬ回路、１４・・・検出用抵抗、
１５・・・差動増幅器、１６・・・比較器。
１７・・・設定器、１８・・・警報回路。
特許出願人
株式会社 芝浦製作所The figure is a circuit diagram showing an embodiment of Book 5i@. l... 3-phase AC power supply, 2... current converter, 3...
Load, 4.5, 1i--Detection resistor, ? , 8.9...
・Rectifier amplifier circuit, 10, 11.12...-Capacitor, 13...! 11fIL circuit, 14... detection resistor,
15... Differential amplifier, 16... Comparator. 17... Setting device, 18... Alarm circuit. Patent applicant Shibaura Seisakusho Co., Ltd.
Claims (1)
電圧信号に変換する手段と、この交流電圧信号を整流、
平滑して直流電圧信号に変換する手段と、この［ｍ電圧
信号に変換された各相の電流値の不平淘量を検出する手
段と、この検出された不平衡量があらかじめ設定された
値以上になった場合に警報を発するか又は電源を遣欧さ
せる信号を出力する手段よりなる電流不平衡検出装置。A means for detecting the current of each phase between the three-phase AC power supply and the load and converting it into an AC voltage signal, rectifying the AC voltage signal,
means for smoothing and converting it into a DC voltage signal; means for detecting the unbalance amount of the current value of each phase converted into the [m voltage signal; A current unbalance detection device comprising means for issuing a warning or outputting a signal to switch the power supply when the current imbalance occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5104482A JPS58172923A (en) | 1982-03-31 | 1982-03-31 | Current unbalance detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5104482A JPS58172923A (en) | 1982-03-31 | 1982-03-31 | Current unbalance detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58172923A true JPS58172923A (en) | 1983-10-11 |
Family
ID=12875797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5104482A Pending JPS58172923A (en) | 1982-03-31 | 1982-03-31 | Current unbalance detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58172923A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5287135A (en) * | 1987-01-13 | 1994-02-15 | Asahi Kogaku Kogyo K.K. | Built-in flash system |
| JP2017135969A (en) * | 2016-01-26 | 2017-08-03 | エルエス産電株式会社Lsis Co., Ltd. | Control apparatus in static var compensator system, and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540849U (en) * | 1978-09-09 | 1980-03-15 |
-
1982
- 1982-03-31 JP JP5104482A patent/JPS58172923A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540849U (en) * | 1978-09-09 | 1980-03-15 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5287135A (en) * | 1987-01-13 | 1994-02-15 | Asahi Kogaku Kogyo K.K. | Built-in flash system |
| JP2017135969A (en) * | 2016-01-26 | 2017-08-03 | エルエス産電株式会社Lsis Co., Ltd. | Control apparatus in static var compensator system, and control method thereof |
| US10056825B2 (en) | 2016-01-26 | 2018-08-21 | Lsis Co., Ltd. | Control apparatus and method in static VAR compensator system |
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