JPS58103895A - Protecting device for variable speed rotary electric machine - Google Patents
Protecting device for variable speed rotary electric machineInfo
- Publication number
- JPS58103895A JPS58103895A JP56202933A JP20293381A JPS58103895A JP S58103895 A JPS58103895 A JP S58103895A JP 56202933 A JP56202933 A JP 56202933A JP 20293381 A JP20293381 A JP 20293381A JP S58103895 A JPS58103895 A JP S58103895A
- Authority
- JP
- Japan
- Prior art keywords
- load current
- variable speed
- current
- allowable
- generator
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
Abstract
Description
【発明の詳細な説明】
この発明は、５Ｉ変速回転電機が低回転領域で過負荷状
態になった場合に、コイルなどの焼損を防止する可変速
回転電機の保護装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection device for a variable speed rotating electrical machine that prevents coils and the like from being burnt out when the 5I variable speed rotating electrical machine is overloaded in a low rotation range.
従来この種の装置として牙１図に示すものがあった。図
シ：おいて、（１１は電源、（２）はこの電源１１１に
接続され、電力の入切をする開閉器、（３１はこの開閉
器（２）を通して上記電源１１１に接続された磁力変換
装置であって、供給された電力をサイリスタなどを応用
した可変周波数、可変゛罐圧の磁力に変換する。（４）
は上記電力変換装置（３）にて変換された磁力により駆
動される可変速回転電機である可変速゛電動機、（５１
はこの可変速゛峨動機（４）によって運転される負荷装
置、（６）は上記電源＋１１から上記可変速電動機（４
）へ接続される主回路に挿入された°電流検出器である
変流器、（７）はこの変流器（６）の２次側に接続され
た保護継゛題器であって、上記可変速電動＄ １４１の
負荷電流が所定値を越えると動作して上記開閉器（２）
および（または）上記磁力変換装置（３）をトリップさ
せる。A conventional device of this type is shown in Fig. 1. In the figure, (11 is a power supply, (2) is a switch connected to this power supply 111 and turns on/off the power, (31 is a magnetic force converter connected to the above power supply 111 through this switch (2)) It is a device that converts the supplied electric power into a variable frequency, variable cylinder pressure magnetic force using a thyristor, etc. (4)
is a variable speed electric motor (51) which is a variable speed rotating electric machine driven by the magnetic force converted by the power conversion device (3).
is a load device operated by this variable speed motor (4), and (6) is a load device that is operated by the variable speed motor (4) from the power supply +11.
) is a current transformer which is a current detector inserted in the main circuit connected to When the load current of the variable speed electric motor $141 exceeds a predetermined value, it operates and the above switch (2)
and/or trip the magnetic force conversion device (3).
次に動作について説明する。電力変換装置（３）は電源
（ｌ、）から供給される定電圧、定周波数の電力を可変
周波数、？８１変電圧へ変換して可変速磯動機（４）へ
供給する。可変速電動機（４）はこの磁力の供給な受け
て回転するが、その回転数は負荷装置（５）の負荷に応
じて任意Ｃ二設定されて運転される。このような可変速
電動機（４）の運転時の過負荷保護装置としては、変流
器（６）により検出される負荷電流−を入力と凡て動作
する保護継電器（７）−が設けられてし）る。そして、
保護線ａｍ＋ｑｒは、その入力された負荷電流が所定値
を越えれば瞬時に、あるいは限時動作をもって動作し、
Ｎ閉器（２１および（または）電力変換装置（３）をト
リップさせて、可変速電動機（４）を保護している。Next, the operation will be explained. The power conversion device (3) converts the constant voltage, constant frequency power supplied from the power source (l,) into variable frequency, ? The voltage is converted to 81 variable voltage and supplied to the variable speed isomotor (4). The variable speed electric motor (4) rotates in response to the supply of this magnetic force, and its rotational speed is set to an arbitrary value C2 depending on the load of the load device (5). As an overload protection device during operation of such a variable speed motor (4), a protective relay (7) is provided which operates whenever the load current detected by the current transformer (6) is input. ). and,
The protection wire am+qr operates instantly or with a limited time operation when the input load current exceeds a predetermined value.
The variable speed electric motor (4) is protected by tripping the N-closer (21) and/or the power converter (3).
しかるに、この可変速電動機（４１におし）ては、負荷
のトルク特性が２乗トルク特性等の場合は、負荷トルク
が回転数の２乗に比例するので１例えば５０％の回転数
では（０，５” ＝ ０．２５となるように）２５％の
負荷磁流しか流れないから、特別に冷却用の他力ファン
は設けないのが普通である。However, in this variable speed electric motor (41), if the torque characteristic of the load is a square torque characteristic, the load torque is proportional to the square of the rotation speed, so at 1, for example, 50% rotation speed ( Since only 25% of the load magnetic current flows (so that 0.5" = 0.25), no external cooling fan is normally provided.
牙２図は、上記負荷トルク特性が２乗トルク特性の、場
合の回転数と電流（温度）に、対する冷却能力（イ）、
許容、負荷゛磁流（ロ）、負荷電流４／）の関係を示し
たもので、縦軸に電流（温Ｉｔ）、横軸に回転数をとっ
た場合１回転数に比例して冷却能力１イ）は上昇し、こ
れと同様に上記可変速電動機（４）の負荷電流し→、許
容負荷電流（ロ）すなわち許容温度もおおよそ比例関係
にある。Figure 2 shows the cooling capacity (a) versus rotation speed and current (temperature) when the above load torque characteristic is a squared torque characteristic.
It shows the relationship between allowable load, magnetic current (B), and load current 4/), where the vertical axis is the current (temperature It) and the horizontal axis is the number of revolutions.The cooling capacity is proportional to the number of revolutions. 1) increases, and in the same way, the load current of the variable speed motor (4) → and the allowable load current (b), that is, the allowable temperature, are approximately proportional to each other.
このよう瀝関係にあるとき、たとえば矛２図で 。When there is a relationship like this, for example, in Figure 2.
、向転数Ａ点で運転中、負荷装置１５）（送風機など）
が何か異物などを噛み込んで急に負荷ａｔｍが８点まで
上昇したとする。すると、それにつれて可変速電動機（
４）のコイルなどの温度も上昇するが。, while operating at rotation speed A point, load device 15) (air blower, etc.)
Suppose that the load atm suddenly rises to 8 points due to some foreign object being caught in the atm. Then, the variable speed electric motor (
4) The temperature of the coil etc. will also rise.
冷知能力が不足するためコイルなどを焼損から防止する
ことができない。また、保護線（器（７）は通常、矛２
図にも示すとおり、０点、つまり最高回転数の１５０％
程度に設定されている。従ってこれでも保護することが
できない。Due to insufficient cooling capacity, it is not possible to prevent coils from burning out. In addition, the protective wire (vessel (7) is usually
As shown in the figure, the 0 point is 150% of the maximum rotation speed.
It is set to about. Therefore, even this cannot be protected.
従来の可変速回転電機の保護装置はａｈのように構成さ
れているので、０Ｔ変速回転電機が低回転数領域で、負
荷装置に異物などが混入して、負荷トルクが回転数の２
乗に比例しない高負荷が生じた場合、それに相応する負
荷磁流が可変速回転電機（磁流れて、コイルなどの温度
が上昇するが、（５０％の回転数の場合、２５％のトル
クであればよいが、それ以上となると）回転数に相応し
た冷却能力（自己ファンは設けであるが、他力ファンが
ないため）では冷却することができないし、また可変速
回転電機用の保護継電器の電流設定値も、第２図で示し
たように最高の回転数を基準にその値がきめられている
ため、これを保護することができず、０］変速回転電機
のコイルが焼損するなどの欠点があった。Conventional protection devices for variable speed rotating electrical machines are configured as shown in ah, so when a 0T variable speed rotating electrical machine is in a low rotational speed region, foreign objects may get into the load device, causing the load torque to drop to 2 times the rotational speed.
When a high load that is not proportional to the power of It would be nice to have one, but if it is higher than that, it will not be possible to cool it with the cooling capacity commensurate with the rotation speed (it has a self-powered fan, but there is no externally powered fan), and it will not be possible to cool the machine with a protective relay for variable speed rotating electric machines. As shown in Figure 2, the current setting value for 0] is determined based on the highest rotational speed, so it cannot be protected and the coil of the variable speed rotating electric machine may burn out. There was a drawback.
この発明は、上記のような従来のものの欠点を除去する
ためになされたもので、可変速回転電機の回転数に応じ
た許容負荷電流値を導出し、この題流値を運転中の負荷
電流値と比較して、運転中の負荷電流値が許容負荷゛罐
流値を越えると主回路な１断することｇ二よって０回転
数制御範囲の全域で可変速回転電機の過負荷保護を確実
に行なわしめるようにできる可変速回転電機の保護装置
を提供することを目的としている。This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it derives an allowable load current value according to the rotation speed of a variable speed rotating electrical machine, and uses this current value as the load current during operation. If the load current value during operation exceeds the permissible load current value, the main circuit will be disconnected. Therefore, overload protection of the variable speed rotating electric machine is ensured throughout the 0 rotation speed control range. It is an object of the present invention to provide a protection device for a variable speed rotating electric machine that can be used to protect a variable speed rotating electrical machine.
以下、この発明の一実施例を図について説明する。矛２
図において、（８）は可変速電動機（４）に接続された
検出装置である指速発電機であって、可変速電動機１４
）の回転数を取り出して１圧、ＩＥ流などに変換する。An embodiment of the present invention will be described below with reference to the drawings. spear 2
In the figure, (8) is a finger speed generator which is a detection device connected to the variable speed motor (4), and the variable speed motor 14
) is extracted and converted to 1 pressure, IE flow, etc.
１９３は上記指速発電機（８）の出力信号を人力とし、
その時々の入力値に対し、可変速電動機（４）に対する
許容負荷電流値を出力する関数発生器、 ＩｌＧは変流
器（６１で検出した負荷磁流値と上記関数発生器（９）
から出力された許容負荷電流値とを入力し、これら両者
を比較する比較器であって、負荷電流値が許容負荷電流
値を越えると信号を導出するうａυは上記比較器が信号
を導出するとこれを入力し動作する出力装置であって、
瞬時あるいは所定時限によって開閉器１２）および（ま
たは）電力変換装置（３）をトリップして主回路を１断
させる。193 uses the output signal of the finger speed generator (8) as human power,
A function generator that outputs an allowable load current value for the variable speed motor (4) in response to the input value at that time, IIG is a current transformer (load magnetic current value detected at 61 and the function generator (9)
It is a comparator that inputs the allowable load current value outputted from and compares the two, and when the load current value exceeds the allowable load current value, a signal is derived. An output device that operates by inputting this,
The switch 12) and/or the power converter (3) are tripped instantaneously or within a predetermined time period to interrupt the main circuit.
なお、その他の構成については、従来と同様につき説明
を省略する。Note that the other configurations are the same as those of the prior art, so explanations will be omitted.
次に動作について説明する。、指速発電機（８）で。Next, the operation will be explained. , with a finger speed generator (8).
可変速電動機（４）の時々刻々の回転数が電圧、電流に
変換されて関数発生器１９１へ送り込まれる。これによ
り関数発生器＋９３は可変速電動機（４）の時ｑ刻々の
負荷磁流に対応する許容負荷４流を出力する。The momentary rotational speed of the variable speed electric motor (4) is converted into voltage and current and sent to the function generator 191. As a result, the function generator +93 outputs an allowable load current of 4 corresponding to the load magnetic current of the variable speed motor (4) every time q.
この許容負荷゛電流は可変速電動機（４）の回転数領域
に対する冷却能力とその温間上昇値から設定されるもの
である。（矛２１＆）
比較器ｔｌＱでは、関数発生器＋９１と変流器（６）か
らの許容負荷電流および負荷電流を入力し、これらを比
較してその時々刻々の回転数に対する負荷電流が、その
許容負荷電流を越えると動作してその出力が出力装置α
υへ伝達される。そして、出力装置０υが動作すること
により主回路が切断されることによって、可変速電動機
ｆ４１のコイル焼損などを未然に保゛護している。This allowable load current is set based on the cooling capacity for the rotation speed range of the variable speed motor (4) and its warm rise value. (Year 21 &) Comparator tlQ inputs the allowable load current and load current from function generator +91 and current transformer (6), and compares them to determine the load current for each momentary rotation speed. When the load current is exceeded, it operates and its output is sent to the output device α.
transmitted to υ. By operating the output device 0υ, the main circuit is disconnected, thereby preventing coil burnout of the variable speed motor f41.
このようにして、可変速電動機（４）はその運転される
回転数の全域で安全に過負荷から保護されることになる
。In this way, the variable speed electric motor (4) is safely protected from overloading over the entire range of its operating speeds.
なお、上記実施例では変流器（６１を電力変換装置に引
の入力側に設けたものを示したが、出力側に変流４（６
ｊを設けてもよい。In addition, in the above embodiment, a current transformer (61) was provided on the input side of the power converter, but a current transformer 4 (61) was provided on the output side.
j may be provided.
また、上記実施例では可変速電動機（４１の負荷電流を
検出するのに変流器（６）を設けたものを示したが、負
荷電流を検出できるものなら変流器１６）でなくてもよ
い。Further, in the above embodiment, the variable speed motor (41) is provided with a current transformer (6) to detect the load current, but if the load current can be detected, the current transformer (16) may not be used. good.
さらにまた、上記実施例では可変速′鑞動機（４）の回
転数を取出すのに指速発電機（８）を設けたものを示し
たが、可変速電動機（４）の速度相当のものが検出でき
れば、指速発電機（８１，でなくても、パルスでも端子
磁圧でも入力周波数でもよく、上記実権例が運転される
その時々の回転数における負荷電流値を検出し、これら
に対応する許容負荷電流値と比較して、負荷゛電流値が
許容負荷゛電流値を越えると主回路を切断させるように
構成したので、可変速回転４ａｌｌのコイル焼損などを
防止できる効果がある。Furthermore, in the above embodiment, a finger speed generator (8) is provided to extract the rotation speed of the variable speed electric motor (4), but a generator corresponding to the speed of the variable speed electric motor (4) is used. If it can be detected, it may be a finger speed generator (81), it may be a pulse, a terminal magnetic pressure, or an input frequency. Compared to the allowable load current value, the main circuit is disconnected when the load current value exceeds the allowable load current value, which has the effect of preventing coil burnout of the variable speed rotation 4all.
矛１図は従来の可変速回転電機の保護装置を示すシステ
ム系統図１才２図は可変速回転電機の回転数と電流（温
度）に対する冷却能カ、許容負荷電流、負荷電流の関係
図、矛３図はこの発明の一実施例による可変速回転電機
の保護装置を示すシステム系統図である。
図において、【１）は電源、（２）は開閉器、（３１は
鑞カ変換器、１４）は可変速回転電機、（６）は磁流検
出器。
（８）は検出装置、１９Ｊは関数発生器、 ＋１（ｌは
比較器、Ｕυは出力装置である。
なお１図中同一行号は同一、又は相当部分を示Ｃ１
代理人 搗 野 信 −
第１図
第２図
第３図Figure 1 is a system diagram showing a conventional protection device for a variable speed rotating electrical machine.Figure 1 is a diagram showing the relationship between cooling capacity, allowable load current, and load current for the rotation speed and current (temperature) of a variable speed rotating electrical machine. Figure 3 is a system diagram showing a protection device for a variable speed rotating electric machine according to an embodiment of the present invention. In the figure, [1] is a power supply, (2) is a switch, (31 is a soldering force converter, 14) is a variable speed rotating electric machine, and (6) is a magnetic current detector. (8) is a detection device, 19J is a function generator, +1 (l is a comparator, and Uυ is an output device. Note that the same line numbers in Figure 1 indicate the same or corresponding parts. Figure 1 Figure 2 Figure 3
Claims (1)
変速回転電機、この可変速回転電機と上記電源との間の
主回路に挿入され負荷電流を検出する電流検出器、上記
可変速回転゛電機の回転数に応じた信号を導出する検出
装置、この検出装置からの信号を入力としそれに応じた
許容負荷電流を出力する関数発生器、この関数発生器か
らの信号と上記電流検出器で検出した負荷電流を入力し
両者を比較する比較器、この比較器により負荷電流が許
容負荷゛電流を越えると動作し上記主回路を切る出力装
置を備えた可変速回転電機の保護装置。A variable speed rotating electrical machine connected to a power source via a magnetic force converter and a switch, a current detector inserted into the main circuit between the variable speed rotating electrical machine and the power source to detect the load current, and the variable speed rotating electrical machine connected to the power source through a magnetic force converter and a switch. A detection device that derives a signal according to the rotation speed of the electrical machine, a function generator that receives the signal from this detection device and outputs the allowable load current accordingly, and detects the signal from this function generator and the above current detector. A protection device for a variable speed rotating electrical machine, comprising a comparator that inputs a load current and compares the two, and an output device that operates when the comparator causes the load current to exceed the allowable load current and cuts off the main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56202933A JPS58103895A (en) | 1981-12-15 | 1981-12-15 | Protecting device for variable speed rotary electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56202933A JPS58103895A (en) | 1981-12-15 | 1981-12-15 | Protecting device for variable speed rotary electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58103895A true JPS58103895A (en) | 1983-06-21 |
Family
ID=16465559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56202933A Pending JPS58103895A (en) | 1981-12-15 | 1981-12-15 | Protecting device for variable speed rotary electric machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58103895A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115018A (en) * | 1984-07-02 | 1986-01-23 | Hanshin Electric Co Ltd | Method of detecting abnormality of fan motor for combustion control system |
| JPS6469281A (en) * | 1987-09-09 | 1989-03-15 | Mitsubishi Electric Corp | Inverter controller |
| JPH0311918A (en) * | 1989-06-08 | 1991-01-21 | Mitsubishi Electric Corp | Overcurrent protective relay |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5145250A (en) * | 1974-10-16 | 1976-04-17 | Hitachi Ltd | KAITENDENKINOHOGOSOCHI |
-
1981
- 1981-12-15 JP JP56202933A patent/JPS58103895A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5145250A (en) * | 1974-10-16 | 1976-04-17 | Hitachi Ltd | KAITENDENKINOHOGOSOCHI |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115018A (en) * | 1984-07-02 | 1986-01-23 | Hanshin Electric Co Ltd | Method of detecting abnormality of fan motor for combustion control system |
| JPH0158415B2 (en) * | 1984-07-02 | 1989-12-12 | Hanshin Electrics | |
| JPS6469281A (en) * | 1987-09-09 | 1989-03-15 | Mitsubishi Electric Corp | Inverter controller |
| JPH0311918A (en) * | 1989-06-08 | 1991-01-21 | Mitsubishi Electric Corp | Overcurrent protective relay |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5436784A (en) | Motor protection relay using thermal models | |
| US3803455A (en) | Electric circuit breaker static trip unit with thermal override | |
| US3727103A (en) | Three phase system monitoring and control circuit | |
| US4647825A (en) | Up-to-speed enable for jam under load and phase loss | |
| US3633073A (en) | Overload and overcurrent regulation and protection system | |
| JPS605155B2 (en) | Brushless synchronous machine protection device | |
| US4060843A (en) | Protection circuit for multiple phase power systems | |
| EP0007617B1 (en) | Disconnect and overload bypass arrangement for a portable tool | |
| EP0469207A2 (en) | Solid state overload relay | |
| CN113454866A (en) | Method and apparatus for controlling power supply to protected electrical loads | |
| US4509088A (en) | Motor protector relay with memory of overload | |
| EP0546981A2 (en) | Three phase compressor over temperature protection | |
| US4246622A (en) | Overload protective device of electric motors | |
| US6201369B1 (en) | SCR protection from stalled motor without current sensing | |
| JPS58103895A (en) | Protecting device for variable speed rotary electric machine | |
| US3036242A (en) | Overtemperature protected apparatus | |
| US3942074A (en) | Static overcurrent relay | |
| US4486803A (en) | Electronic system for high amperage circuit interruption apparatus | |
| US3465206A (en) | Time delay circuit breaker with short-circuit bypass | |
| US3646396A (en) | Overload protection system for dc motors | |
| US4739435A (en) | Safety device for an electric power tool | |
| US4858053A (en) | Operational amplifier having an improved feedback system including an integrator having a hurry-up circuit, and an electric motor control using the same for inverse trip selection | |
| NZ194200A (en) | Three phase circuit breaker tripped by single phase fault | |
| Sudha et al. | A novel protecting method for induction motor against faults due to voltage unbalance and single phasing | |
| DeCastro et al. | Stall protection of large induction motors |