JP5147864B2 - Load current monitoring device and load power monitoring device - Google Patents

Load current monitoring device and load power monitoring device Download PDF

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JP5147864B2
JP5147864B2 JP2009553326A JP2009553326A JP5147864B2 JP 5147864 B2 JP5147864 B2 JP 5147864B2 JP 2009553326 A JP2009553326 A JP 2009553326A JP 2009553326 A JP2009553326 A JP 2009553326A JP 5147864 B2 JP5147864 B2 JP 5147864B2
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JPWO2009101711A1 (en
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俊彦 宮内
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current

Description

この発明は、モーター等の負荷電流（又は負荷電力）を監視する負荷電流監視装置（又は負荷電力監視装置）に関し、設定時の実際の負荷電流値（又は負荷電力値）を設定ターゲット電流値（又は設定ターゲット電力値）として記憶し、設定ターゲット電流値（又は設定ターゲット電力値）と瞬時負荷電流値（又は瞬時負荷電力値）とを比較監視するものに係わる。   The present invention relates to a load current monitoring device (or load power monitoring device) for monitoring a load current (or load power) of a motor or the like, and an actual load current value (or load power value) at the time of setting is set as a set target current value ( Or a set target power value) and a comparative monitoring of the set target current value (or set target power value) and the instantaneous load current value (or instantaneous load power value).

従来、電気系統の引き込み主回路に接続されたモータとそのモータで駆動される機械設備において、プラントを管理しているメンテナンス員は、設備の安定した状態を管理する為に、設備の安定状態時の負荷電流値（設定ターゲット電流値）を表示したシール等を電流計測器の横に貼り付けていることが多い。メンテナンス員は巡回点検時に安定時に表示された設定ターゲット電流値と現在の瞬時負荷電流値が一致しているかどうかを確認している。なお、参考技術文献としては特許文献１がある。   Conventionally, in the motor connected to the main circuit of the electric system and the mechanical equipment driven by the motor, the maintenance staff managing the plant is in the stable state of the equipment in order to manage the stable state of the equipment. In many cases, a sticker or the like indicating the load current value (set target current value) is attached to the side of the current measuring instrument. The maintenance staff checks whether the set target current value displayed at the time of stability during the patrol inspection matches the current instantaneous load current value. As a reference technical document, there is Patent Document 1.

しかし、従来の装置では、負荷が多くなり、監視対象となる負荷電流が多くなるに従って、それらの作業と確認には非常に労力を要し、個々の負荷の瞬時負荷電流値を監視することは、限定されたメンテナンス員では実質上不可能となるため、監視できていないのが実情である。その結果、プラントに軽微な異常が発生していても、見過ごされ重要異常時に初めて異常が発覚し、場合によってはプラント連続運転に支障をきたす場合が発生するという問題点があった。   However, with conventional devices, as the load increases and the load current to be monitored increases, it is very labor intensive to perform such work and confirmation, and it is not possible to monitor the instantaneous load current value of each load. In fact, it is impossible to monitor because it is virtually impossible for limited maintenance personnel. As a result, even if a minor abnormality occurs in the plant, there is a problem that an abnormality is first detected when an important abnormality is overlooked, and in some cases, the continuous operation of the plant may be hindered.

特開平６−１８９５８７号公報Japanese Patent Laid-Open No. 6-1889587

この発明は、上記のような問題点を解消するためになされたもので、実際の負荷電流（又は負荷電力）を設定ターゲット電流値（又は設定ターゲット電力値）として容易に記憶し、瞬時負荷電流値（又は瞬時負荷電力値）との変化割合を表示する負荷電流監視装置（又は負荷電力監視装置）を得ることを目的とする。
また、実際の負荷電流（又は負荷電力）を設定ターゲット電流値（又は設定ターゲット電力値）として容易に記憶し、瞬時負荷電流値（又は瞬時負荷電力値）との変化割合が所定値以上の状態が所定時間以上継続するときに表示する負荷電流監視装置（又は負荷電力監視装置）を得ることを目的とする。The present invention has been made to solve the above-described problems, and can easily store an actual load current (or load power) as a set target current value (or set target power value) to instantaneous load current. An object of the present invention is to obtain a load current monitoring device (or load power monitoring device) that displays a rate of change from a value (or instantaneous load power value).
Also, the actual load current (or load power) is easily stored as the set target current value (or set target power value), and the rate of change from the instantaneous load current value (or instantaneous load power value) is greater than or equal to a predetermined value An object of the present invention is to obtain a load current monitoring device (or load power monitoring device) to be displayed when the power continues for a predetermined time or more.

この発明に係わる負荷電流監視装置は、監視対象となる負荷電流を検出する電流検出回路、前記電流検出回路で検出される負荷電流を設定ターゲット電流値として設定したいときに動作させるセットキーを有する設定回路、前記セットキーの動作に基づいて前記電流検出回路で検出される負荷電流を設定ターゲット電流値として記憶する記憶回路、前記記憶回路で記憶された設定ターゲット電流値と前記電流検出回路で検出される瞬時負荷電流値とを比較演算し、設定ターゲット電流値に対する瞬時負荷電流値の変化割合を出力する論理演算回路、及び前記論理演算回路による前記変化割合を表示する表示回路を備え、設定ターゲット電流値に対する瞬時負荷電流値の変化割合を表示すると共に、負荷の切替えに対しては、負荷の切替えに応じて前記論理演算回路に識別符号付トリガ信号を入力させ、前記論理演算回路はその識別符号付トリガ信号に基づいて前記電流検出回路で検出される負荷電流をそれぞれ識別符号付設定ターゲット電流値として前記記憶回路に記憶させるものである。 A load current monitoring device according to the present invention includes a current detection circuit that detects a load current to be monitored, and a setting key that is operated when it is desired to set the load current detected by the current detection circuit as a set target current value Circuit, a storage circuit for storing a load current detected by the current detection circuit based on the operation of the set key as a set target current value, a set target current value stored by the storage circuit and the current detection circuit A logical operation circuit that compares and calculates the instantaneous load current value and outputs a change rate of the instantaneous load current value with respect to the set target current value, and a display circuit that displays the change rate by the logical operation circuit. and displays the rate of change of the instantaneous load current value for a value for the switching of loads, respond to switching of the load The logic operation circuit inputs a trigger signal with an identification code, and the logic operation circuit uses the load current detected by the current detection circuit based on the trigger signal with the identification code as a set target current value with an identification code, respectively. The data is stored in a memory circuit .

また、この発明に係わる負荷電流監視装置は、監視対象となる負荷電流を検出する電流検出回路、前記電流検出回路で検出される負荷電流を設定ターゲット電流値として設定したいときに動作させるセットキーを有する設定回路、前記セットキーの動作に基づいて前記電流検出回路で検出される負荷電流を設定ターゲット電流値として記憶する記憶回路、前記記憶回路で記憶された設定ターゲット電流値と前記電流検出回路で検出される瞬時負荷電流値とを比較演算し、設定ターゲット電流値に対する瞬時負荷電流値の変化割合が所定値以上の状態が所定時間以上継続するときに異常信号を出力する論理演算回路、及び前記論理演算回路による前記異常信号を表示する表示回路を備え、負荷電流の異常状態を表示すると共に、負荷の切替えに対しては、負荷の切替えに応じて前記論理演算回路に識別符号付トリガ信号を入力させ、前記論理演算回路はその識別符号付トリガ信号に基づいて前記電流検出回路で検出される負荷電流をそれぞれ識別符号付設定ターゲット電流値として前記記憶回路に記憶させるものである。 The load current monitoring device according to the present invention includes a current detection circuit that detects a load current to be monitored, and a set key that is operated when it is desired to set the load current detected by the current detection circuit as a set target current value. A setting circuit having a setting circuit, a storage circuit for storing a load current detected by the current detection circuit based on an operation of the set key as a setting target current value, a setting target current value stored in the storage circuit and the current detection circuit; A logical operation circuit that compares and calculates the detected instantaneous load current value, and outputs an abnormal signal when a change rate of the instantaneous load current value with respect to the set target current value is equal to or greater than a predetermined value for a predetermined period of time; and comprising a display circuit for displaying the abnormal signal by a logic operation circuit, and displays an abnormal state of the load current, the switching of the load The trigger signal with identification code is input to the logic operation circuit according to the switching of the load, and the logic operation circuit receives the load current detected by the current detection circuit based on the trigger signal with the identification code, respectively. This is stored in the storage circuit as a set target current value with an identification code .

この発明の負荷電流監視装置によれば、電流検出回路で検出される負荷電流を設定ターゲット電流値として設定したいときに動作させるセットキーを有する設定回路、前記セットキーの動作に基づいて前記電流検出回路で検出される負荷電流を設定ターゲット電流値として記憶する記憶回路、前記記憶回路で記憶された設定ターゲット電流値と前記電流検出回路で検出される瞬時負荷電流値とを比較演算し、設定ターゲット電流値に対する瞬時負荷電流値の変化割合を出力する論理演算回路、及び前記論理演算回路による変化割合を表示する表示回路を備えたので、実際の負荷電流を設定ターゲット電流値として容易に記憶し、瞬時負荷電流値との変化割合を表示し監視できる。また、負荷の切替えに対しては、負荷の切替えに応じて前記論理演算回路に識別符号付トリガ信号を入力させ、前記論理演算回路はその識別符号付トリガ信号に基づいて前記電流検出回路で検出される負荷電流をそれぞれ識別符号付設定ターゲット電流値として前記記憶回路に記憶させるので、以後は繰り返される識別符号付トリガ信号に対しては、先に記録された識別符号付設定ターゲット電流値を呼び出して瞬時負荷電流値と比較演算できる。 According to the load current monitoring device of the present invention, the setting circuit having a set key that is operated when it is desired to set the load current detected by the current detection circuit as the set target current value, and the current detection based on the operation of the set key A storage circuit that stores a load current detected by the circuit as a set target current value, and compares and calculates a set target current value stored by the storage circuit and an instantaneous load current value detected by the current detection circuit; Since it has a logic operation circuit that outputs the change rate of the instantaneous load current value with respect to the current value and a display circuit that displays the change rate by the logic operation circuit, the actual load current is easily stored as the set target current value, The rate of change from the instantaneous load current value can be displayed and monitored. For load switching, a trigger signal with an identification code is input to the logic operation circuit in response to load switching, and the logic operation circuit is detected by the current detection circuit based on the trigger signal with the identification code. The stored load current is stored in the storage circuit as a set target current value with an identification code, so that the previously recorded set target current value with an identification code is called for a repeated trigger signal with an identification code. Can be compared with the instantaneous load current value.

また、この発明の負荷電流監視装置によれば、電流検出回路で検出される負荷電流を設定ターゲット電流値として設定したいときに動作させるセットキーを有する設定回路、前記セットキーの動作に基づいて前記電流検出回路で検出される負荷電流を設定ターゲット電流値として記憶する記憶回路、前記記憶回路で記憶された設定ターゲット電流値と前記電流検出回路で検出される瞬時負荷電流値とを比較演算し、設定ターゲット電流値に対する瞬時負荷電流値の変化割合が所定値以上の状態が所定時間以上継続するときに異常信号を出力する論理演算回路、及び前記論理演算回路による前記異常信号を表示する表示回路を備えたので、実際の負荷電流を設定ターゲット電流値として容易に記憶し、瞬時負荷電流値との変化割合が所定値以上の状態が所定時間以上継続するときに異常状態を表示し監視できる。また、負荷の切替えに対しては、負荷の切替えに応じて前記論理演算回路に識別符号付トリガ信号を入力させ、前記論理演算回路はその識別符号付トリガ信号に基づいて前記電流検出回路で検出される負荷電流をそれぞれ識別符号付設定ターゲット電流値として前記記憶回路に記憶させるので、以後は繰り返される識別符号付トリガ信号に対しては、先に記録された識別符号付設定ターゲット電流値を呼び出して瞬時負荷電流値と比較演算できる。 According to the load current monitoring device of the present invention, the setting circuit having a set key that is operated when it is desired to set the load current detected by the current detection circuit as the set target current value, based on the operation of the set key A storage circuit that stores the load current detected by the current detection circuit as a set target current value, and compares the set target current value stored by the storage circuit with the instantaneous load current value detected by the current detection circuit; A logical operation circuit that outputs an abnormal signal when a change rate of an instantaneous load current value with respect to a set target current value exceeds a predetermined value for a predetermined time or more, and a display circuit that displays the abnormal signal by the logical operation circuit Because it is provided, the actual load current can be easily stored as the set target current value, and the rate of change from the instantaneous load current value is greater than or equal to the predetermined value. State can be monitored by displaying the abnormal state when predetermined time or longer. For load switching, a trigger signal with an identification code is input to the logic operation circuit in response to load switching, and the logic operation circuit is detected by the current detection circuit based on the trigger signal with the identification code. The stored load current is stored in the storage circuit as a set target current value with an identification code, so that the previously recorded set target current value with an identification code is called for a repeated trigger signal with an identification code. Can be compared with the instantaneous load current value.

この発明の実施の形態１における負荷電流監視装置を示す構成回路図である。1 is a configuration circuit diagram showing a load current monitoring device according to Embodiment 1 of the present invention. 実施の形態１の負荷電流監視装置における動作を説明する波形図である。FIG. 6 is a waveform diagram for explaining the operation in the load current monitoring apparatus of the first embodiment. 実施の形態１の負荷電流監視装置における表示回路の画面例を示す図である。4 is a diagram illustrating a screen example of a display circuit in the load current monitoring apparatus according to Embodiment 1. FIG. 実施の形態２の負荷電流監視装置における動作を説明する波形図である。FIG. 10 is a waveform diagram for explaining an operation in the load current monitoring apparatus of the second embodiment. 実施の形態３の負荷電流監視装置における動作を説明する波形図である。FIG. 10 is a waveform diagram for explaining an operation in the load current monitoring apparatus according to the third embodiment. 実施の形態４の負荷電流監視装置における動作を説明する波形図である。FIG. 10 is a waveform diagram for explaining the operation in the load current monitoring apparatus of the fourth embodiment.

実施の形態１．
図１はこの発明の実施の形態１における負荷電流監視装置を示す構成回路図で、主に閉鎖配電盤であるコントロールセンタで使用されるものである。図において、電力系統から引き込まれた主回路１には、配線用遮断器２、電磁接触器３、主回路１の負荷電流を検出する計器用変成器４、主回路１の零相電流を検出する零相変流器５が設けられ、さらに、負荷であるモータ６が接続され、モータ１により機械設備が運転駆動される。電圧検出回路８は計器用変圧器９に接続され、主回路１の電圧を検出し所定の信号に変換し論理演算回路１０と記憶回路１１に出力する。電流検出回路１２は計器用変成器４に接続され、主回路１の負荷電流を検出し所定の信号に変換し、論理演算回路１０と記憶回路１１に出力する。電流検出回路１２はさらに零相変流器５に接続され、主回路１の地絡故障電流を検出し所定の信号に変換し論理演算回路１０に出力する。Embodiment 1 FIG.
1 is a configuration circuit diagram showing a load current monitoring apparatus according to Embodiment 1 of the present invention, which is mainly used in a control center which is a closed switchboard. In the figure, the main circuit 1 drawn from the power system includes a circuit breaker 2 for wiring, an electromagnetic contactor 3, an instrument transformer 4 for detecting the load current of the main circuit 1, and a zero-phase current of the main circuit 1. A zero-phase current transformer 5 is provided, and a motor 6 as a load is further connected. The voltage detection circuit 8 is connected to the instrument transformer 9, detects the voltage of the main circuit 1, converts it to a predetermined signal, and outputs it to the logic operation circuit 10 and the storage circuit 11. The current detection circuit 12 is connected to the instrument transformer 4, detects the load current of the main circuit 1, converts it into a predetermined signal, and outputs it to the logic operation circuit 10 and the storage circuit 11. The current detection circuit 12 is further connected to the zero-phase current transformer 5, detects a ground fault current in the main circuit 1, converts it into a predetermined signal, and outputs it to the logic operation circuit 10.

設定回路１３は、記憶回路１１に接続され、セットキーを有し、そのセットキーを押す（例えば長押しする）ことによって、その時点での主回路１の実際の負荷電流を記憶回路１１に記憶保持させる。又は、設定回路１３のセットキーを押すことによって、記憶させたい電流値をセットキーを介して入力することによって記憶させたい電流値を記憶回路１１に記憶保持させるようにしてもよい。伝送入出力回路１４は外部の伝送バスからの識別符号付トリガー信号（例えばトリガー１，トリガー２，トリガー３，トリガー４等）を受け入れ、これを論理演算回路１０に入力する。論理演算回路１０は識別符号付トリガー信号を受信すると、記憶回路１１に対して一定タイムラグ後の主回路１の実際の負荷電流を識別符号と共に記憶回路１１に記憶させる。さらに伝送入出力回路１４は論理演算回路１０からの信号を外部へ出力する。   The setting circuit 13 is connected to the storage circuit 11, has a set key, and stores the actual load current of the main circuit 1 at that time in the storage circuit 11 by pressing the set key (for example, long pressing). Hold. Alternatively, by pressing the set key of the setting circuit 13, the current value to be stored may be stored in the storage circuit 11 by inputting the current value to be stored through the set key. The transmission input / output circuit 14 receives a trigger signal with an identification code (for example, trigger 1, trigger 2, trigger 3, trigger 4, etc.) from an external transmission bus and inputs it to the logic operation circuit 10. When receiving the trigger signal with the identification code, the logical operation circuit 10 causes the memory circuit 11 to store the actual load current of the main circuit 1 after a certain time lag in the memory circuit 11 together with the identification code. Further, the transmission input / output circuit 14 outputs the signal from the logic operation circuit 10 to the outside.

表示回路１５は論理演算回路１０に接続され、負荷電流,異常状態や警告等を表示する
。駆動回路１６は論理演算回路１０に接続され、計器用変成器４や零相変流器５からの電流検出信号の演算による出力により電磁接触器３を開閉する。外部出力回路１７は論理演算回路１０からの異常状態や警告等を外部に出力する。The display circuit 15 is connected to the logic operation circuit 10 and displays a load current, an abnormal state, a warning, and the like. The drive circuit 16 is connected to the logic operation circuit 10, and opens and closes the electromagnetic contactor 3 by an output of a current detection signal from the instrument transformer 4 and the zero-phase current transformer 5. The external output circuit 17 outputs an abnormal state or a warning from the logic operation circuit 10 to the outside.

操作用変圧器２２が主回路１に接続されている。変圧器２２の二次巻線２３の出力電圧は配線２４に印加される。配線２４には電磁接触器３のコイル２５、補助接点２６、起動操作スイッチ２７、及び停止操作スイッチ２８の各一端が接続され、各他端は制御回路２１の操作信号出力回路２９、及び操作信号入力端子３０,３１，３２に接続される。さらに、モータ６の逆転操作スイッチを設けておくこともできる。制御回路２１の電源は変圧器２２の三次巻線３３から供給されている。制御回路２１は起動操作スイッチ２７からの起動信号及び停止操作スイッチ２８からの停止信号を受けて電磁接触器３のコイル２５の電流を通電遮断する。これにより電磁接触器３の開閉を行う。また、制御回路２１は計器用変成器４や零相変流器５からの電流検出信号に基づく論理演算回路１０の出力により駆動回路１６を介して電磁接触器３を開放し、モータ６の過負荷保護や地絡保護を行う。   An operation transformer 22 is connected to the main circuit 1. The output voltage of the secondary winding 23 of the transformer 22 is applied to the wiring 24. One end of the coil 25 of the electromagnetic contactor 3, the auxiliary contact 26, the start operation switch 27, and the stop operation switch 28 is connected to the wiring 24, and the other end is connected to the operation signal output circuit 29 of the control circuit 21 and the operation signal. Connected to input terminals 30, 31, and 32. Further, a reverse operation switch for the motor 6 can be provided. Power for the control circuit 21 is supplied from the tertiary winding 33 of the transformer 22. The control circuit 21 receives the start signal from the start operation switch 27 and the stop signal from the stop operation switch 28 and cuts off the current of the coil 25 of the electromagnetic contactor 3. Thereby, the electromagnetic contactor 3 is opened and closed. The control circuit 21 opens the electromagnetic contactor 3 via the drive circuit 16 by the output of the logic operation circuit 10 based on the current detection signals from the instrument transformer 4 and the zero-phase current transformer 5, and the motor 6 Perform load protection and ground fault protection.

図２は実施の形態１の負荷電流監視装置における動作を説明する波形図で、負荷であるモータ６を起動し機械設備７を運転駆動した場合の時間経過に対する実際の負荷電流の変化を示している。負荷電流は起動時に平常時より大でかつ変動する。そのため、起動電流キャンセル時間ｔ１を過ぎて、安定時期に到達した後、希望する時点（例えばプラントシステムが最も安定している状態だとメンテナンス員が判断した点）で設定回路１３が有するセットキーを例えば長押しして、その時点ｔｇで電流検出回路１２より得られた実際の負荷電流を記憶回路１１に設定ターゲット電流値Ｔａとして記憶する。   FIG. 2 is a waveform diagram for explaining the operation of the load current monitoring apparatus according to the first embodiment, showing the actual change in load current with time when the motor 6 as a load is started and the mechanical equipment 7 is driven to operate. Yes. The load current is larger and fluctuates during normal startup. Therefore, after the start-up current cancellation time t1 has passed and the stable time has been reached, the set key of the setting circuit 13 is held at a desired time (for example, a point where the maintenance staff has determined that the plant system is most stable). For example, when a long press is performed, the actual load current obtained from the current detection circuit 12 at the time tg is stored in the storage circuit 11 as the set target current value Ta.

論理演算回路１０は、その設定ターゲット電流値Ｔａを呼び出すと共に、電流検出回路１２から、時々刻々と変化する負荷電流を信号即ち瞬時負荷電流値Ｔａｘ（Ｔａ１，Ｔａ２，Ｔａ３，Ｔａ４---）として得る。論理演算回路１０では、式（１）によって
、設定ターゲット電流値Ｔａに対する瞬時負荷電流値Ｔａｘの変化割合（％）を得ている。
｛（Ｔａｘ−Ｔａ）／Ｔａ｝×１００％＝Ｗａ （１）
これにより設定ターゲット電流値からのバラツキ｛変化割合（％）｝、又は、その継続性による負荷の安定度を監視できる。The logical operation circuit 10 calls the set target current value Ta, and the load current that changes every moment from the current detection circuit 12 as a signal, that is, an instantaneous load current value Tax (Ta1, Ta2, Ta3, Ta4 ---). obtain. In the logical operation circuit 10, the change rate (%) of the instantaneous load current value Tax with respect to the set target current value Ta is obtained by the equation (1).
{(Tax−Ta) / Ta} × 100% = Wa (1)
Thereby, it is possible to monitor the variation {change ratio (%)} from the set target current value or the stability of the load due to the continuity thereof.

図３は実施の形態１の負荷電流監視装置における表示回路の画面例を示す図である。画面は、モータ６の正転（ＦＷＤ）時の瞬時負荷電流値（Ａ）４１を示すと共に、設定ターゲット電流値Ｔａに対する瞬時負荷電流値Ｔａｘの変化割合Ｗａ（％）４２を表している。さらに、例えば、振れ幅定格１０％を基準に、アナログバーグラフ（analog bar graph）表示している。図では１２％までのアナログバーグラフ４３で、現在の７％を７個の目盛り４４で表示している。   FIG. 3 is a diagram illustrating a screen example of the display circuit in the load current monitoring apparatus according to the first embodiment. The screen shows the instantaneous load current value (A) 41 during forward rotation (FWD) of the motor 6 and the change rate Wa (%) 42 of the instantaneous load current value Tax with respect to the set target current value Ta. Further, for example, an analog bar graph is displayed based on an amplitude rating of 10%. In the figure, the analog bar graph 43 up to 12% and the current 7% are displayed by seven scales 44.

このようにして、実施の形態１の負荷電流監視装置では、セットキーを押すことによりその時点の負荷電流を設定ターゲット電流値として容易に記憶でき、設定ターゲット電流値に対する瞬時負荷電流値の変化割合（％）を表示するので、負荷電流値の変化割合を常に監視できる。   In this way, in the load current monitoring apparatus of the first embodiment, the load current at that time can be easily stored as the set target current value by pressing the set key, and the change rate of the instantaneous load current value with respect to the set target current value Since (%) is displayed, the change rate of the load current value can always be monitored.

実施の形態２．
図４は実施の形態２の負荷電流監視装置における動作を説明する波形図である。論理演算回路１０には、設定ターゲット電流値Ｔａに対する瞬時負荷電流値Ｔａｘの所定の変化割合（±Ｂ％）を設定し、設定ゾーンＺとする。さらに、論理演算回路１０は、設定ターゲット電流値Ｔａに対する瞬時負荷電流値Ｔａｘが所定の変化割合以上で、それが所定時間ｔ２以上継続したときは異常信号を出力する。出力された異常信号は表示回路１５に異常表示され、負荷電流が異常であることを表示する。Embodiment 2. FIG.
FIG. 4 is a waveform diagram for explaining the operation of the load current monitoring apparatus according to the second embodiment. A predetermined change rate (± B%) of the instantaneous load current value Tax with respect to the set target current value Ta is set in the logic operation circuit 10 to be a setting zone Z. Further, the logical operation circuit 10 outputs an abnormal signal when the instantaneous load current value Tax with respect to the set target current value Ta is equal to or greater than a predetermined change rate and continues for a predetermined time t2. The output abnormal signal is displayed abnormally on the display circuit 15 to indicate that the load current is abnormal.

また、論理演算回路１０において、前記異常信号を発生する回数を積算し、その積算値を表示回路１５で表示させるようにすれば、前記異常信号の回数がどの程度であるかによって、負荷の安定度を監視することができる。   Further, when the number of times that the abnormal signal is generated is integrated in the logical operation circuit 10 and the integrated value is displayed on the display circuit 15, the load can be stabilized depending on how many times the abnormal signal is generated. The degree can be monitored.

実施の形態３．
図５は実施の形態３の負荷電流監視装置における動作を説明する波形図である。負荷が切り替わる場合又はサイクル負荷変動がある場合、設定ターゲット電流値を複数設定することが可能である。負荷変動の切替えタイミングは、トリガ電圧入力３４ａ,３４ｂ,３４ｃ,３４ｄ、又は伝送入出力回路１４を介して外部から識別符号付トリガ信号（トリガ１，トリガ２，トリガ３，トリガ４，トリガ１，---）として入力させると、論理演算回路１０は、識別符号付トリガ信号毎に一定タイムラグ後の負荷電流を識別符号付設定ターゲット電流値として記録回路１１に記録する。以後は繰り返される識別符号付トリガ信号に対しては、先に記録された識別符号付設定ターゲット電流値を呼び出して瞬時負荷電流値と比較演算する。比較演算は実施の形態１及び実施の形態２と同様である。Embodiment 3 FIG.
FIG. 5 is a waveform diagram for explaining the operation of the load current monitoring apparatus according to the third embodiment. When the load is switched or when there is a cycle load fluctuation, it is possible to set a plurality of set target current values. The load change switching timing is determined by using a trigger signal (trigger 1, trigger 2, trigger 3, trigger 4, trigger 1, trigger signal input 34a, 34b, 34c, 34d or the transmission input / output circuit 14 from the outside. When input as ---), the logic operation circuit 10 records the load current after a certain time lag in the recording circuit 11 as a set target current value with identification code for each trigger signal with identification code. Thereafter, for a trigger signal with identification code that is repeated thereafter, the previously set identification target value with identification code is called and compared with the instantaneous load current value. The comparison operation is the same as in the first and second embodiments.

実施の形態４．
図６は実施の形態４の負荷電流監視装置における動作を説明する波形図である。負荷電流を計測するに当たって、平均化処理機能を持たせることによって、脈動する負荷電流に対しても精度を上げることができる。時刻ｔｇ１〜ｔｇ２の時間Ｔｍにより検出される負荷電流を平均化処理し、その値によって、設定ターゲット電流値Ｔａを設定する。設定されたターゲット電流値Ｔａと瞬時負荷電流値との比較演算は実施の形態１〜実施の形態３と同様である。Embodiment 4 FIG.
FIG. 6 is a waveform diagram for explaining the operation of the load current monitoring apparatus according to the fourth embodiment. In measuring the load current, by providing an averaging processing function, it is possible to improve the accuracy with respect to the pulsating load current. The load current detected at time Tm from time tg1 to time tg2 is averaged, and the set target current value Ta is set according to the value. The comparison calculation between the set target current value Ta and the instantaneous load current value is the same as in the first to third embodiments.

実施の形態５．
また、実施の形態１〜実施の形態４において、負荷電流に電圧検出回路８で検出された電圧を乗算して電力とすることにより、負荷電力を設定ターゲット電力値として、瞬時負荷電力値と比較演算することにより、負荷電力値を監視できる。なお、電流検出回路と電圧検出回路から電力を検出しているが、両回路は電力検出回路と等価である。Embodiment 5 FIG.
In the first to fourth embodiments, the load current is multiplied by the voltage detected by the voltage detection circuit 8 to obtain power, thereby comparing the load power with the set target power value and the instantaneous load power value. By calculating, the load power value can be monitored. In addition, although electric power is detected from the current detection circuit and the voltage detection circuit, both circuits are equivalent to the power detection circuit.

実施の形態５の構成は次のとおりである。
負荷電力監視装置は、監視対象となる負荷電力を検出する電流検出回路と電圧検出回路、前記電流検出回路と前記電圧検出回路で検出される負荷電力を設定ターゲット電力値として設定したいときに動作させるセットキーを有する設定回路、前記セットキーの動作に基づいて前記電流検出回路と前記電圧検出回路で検出される負荷電力を設定ターゲット電力値として記憶する記憶回路、前記記憶回路で記憶された設定ターゲット電力値と前記電流検出回路と前記電圧検出回路で検出される瞬時負荷電力値とを比較演算し、設定ターゲット電力値に対する瞬時負荷電力値の変化割合を出力する論理演算回路、及び前記論理演算回路による前記変化割合を表示する表示回路を備え、設定ターゲット電力値に対する瞬時負荷電力値の変化割合を表示するものである。The configuration of the fifth embodiment is as follows.
The load power monitoring device is operated when it is desired to set the load power detected by the current detection circuit and the voltage detection circuit for detecting the load power to be monitored and the current detection circuit and the voltage detection circuit as the set target power value. A setting circuit having a set key, a storage circuit for storing load power detected by the current detection circuit and the voltage detection circuit based on the operation of the set key as a set target power value, and a setting target stored in the storage circuit A logical operation circuit that compares and calculates a power value, an instantaneous load power value detected by the current detection circuit and the voltage detection circuit, and outputs a change rate of the instantaneous load power value with respect to a set target power value, and the logical operation circuit A display circuit that displays the change rate according to, and displays the change rate of the instantaneous load power value relative to the set target power value Is shall.

また、負荷電力監視装置は、監視対象となる負荷電力を検出する電流検出回路と電圧検出回路、前記電流検出回路と前記電圧検出回路で検出される負荷電力を設定ターゲット電力値として設定したいときに動作させるセットキーを有する設定回路、前記セットキーの動作に基づいて前記電流検出回路と前記電圧検出回路で検出される負荷電力を設定ターゲット電力値として記憶する記憶回路、前記記憶回路で記憶された設定ターゲット電力値と前記電流検出回路と前記電圧検出回路で検出される瞬時負荷電力値とを比較演算し、設定ターゲット電力値に対する瞬時負荷電力値の変化割合が所定値以上の状態が所定時間以上継続するときに異常信号を出力する論理演算回路、及び前記論理演算回路による前記異常信号を表示する表示回路を備え、負荷電力の異常状態を表示するものである。   Further, the load power monitoring device is configured to set a current detection circuit and a voltage detection circuit for detecting load power to be monitored, and load power detected by the current detection circuit and the voltage detection circuit as a set target power value. A setting circuit having a set key to be operated, a storage circuit that stores load power detected by the current detection circuit and the voltage detection circuit based on the operation of the set key as a set target power value, and stored in the storage circuit Comparing and calculating the set target power value and the instantaneous load power value detected by the current detection circuit and the voltage detection circuit, and when the change rate of the instantaneous load power value with respect to the set target power value is equal to or greater than a predetermined value A logical operation circuit that outputs an abnormal signal when continuing, and a display circuit that displays the abnormal signal by the logical operation circuit It is for displaying an abnormal state of the load power.

Claims (3)

監視対象となる負荷電流を検出する電流検出回路、
前記電流検出回路で検出される負荷電流を設定ターゲット電流値として設定したいときに動作させるセットキーを有する設定回路、
前記セットキーの動作に基づいて前記電流検出回路で検出される負荷電流を設定ターゲット電流値として記憶する記憶回路、
前記記憶回路で記憶された設定ターゲット電流値と前記電流検出回路で検出される瞬時負荷電流値とを比較演算し、設定ターゲット電流値に対する瞬時負荷電流値の変化割合を出力する論理演算回路、
及び前記論理演算回路による前記変化割合を表示する表示回路を備え、
設定ターゲット電流値に対する瞬時負荷電流値の変化割合を表示すると共に、
負荷の切替えに対しては、負荷の切替えに応じて前記論理演算回路に識別符号付トリガ信号を入力させ、前記論理演算回路はその識別符号付トリガ信号に基づいて前記電流検出回路で検出される負荷電流をそれぞれ識別符号付設定ターゲット電流値として前記記憶回路に記憶させるようにした負荷電流監視装置。A current detection circuit for detecting a load current to be monitored;
A setting circuit having a set key that is operated when it is desired to set a load current detected by the current detection circuit as a setting target current value;
A storage circuit for storing a load current detected by the current detection circuit based on an operation of the set key as a set target current value;
A logical operation circuit that compares and calculates the set target current value stored in the storage circuit and the instantaneous load current value detected by the current detection circuit, and outputs a change rate of the instantaneous load current value with respect to the set target current value;
And a display circuit for displaying the change rate by the logical operation circuit,
In addition to displaying the change rate of the instantaneous load current value to the set target current value ,
In response to load switching, a trigger signal with an identification code is input to the logic operation circuit in response to load switching, and the logic operation circuit is detected by the current detection circuit based on the trigger signal with the identification code. A load current monitoring device in which each load current is stored in the storage circuit as a set target current value with an identification code . 監視対象となる負荷電流を検出する電流検出回路、
前記電流検出回路で検出される負荷電流を設定ターゲット電流値として設定したいときに動作させるセットキーを有する設定回路、
前記セットキーの動作に基づいて前記電流検出回路で検出される負荷電流を設定ターゲット電流値として記憶する記憶回路、
前記記憶回路で記憶された設定ターゲット電流値と前記電流検出回路で検出される瞬時負荷電流値とを比較演算し、設定ターゲット電流値に対する瞬時負荷電流値の変化割合が所定値以上の状態が所定時間以上継続するときに異常信号を出力する論理演算回路、
及び前記論理演算回路による前記異常信号を表示する表示回路を備え、
負荷電流の異常状態を表示すると共に、
負荷の切替えに対しては、負荷の切替えに応じて前記論理演算回路に識別符号付トリガ信号を入力させ、前記論理演算回路はその識別符号付トリガ信号に基づいて前記電流検出回路で検出される負荷電流をそれぞれ識別符号付設定ターゲット電流値として前記記憶回路に記憶させるようにした負荷電流監視装置。A current detection circuit for detecting a load current to be monitored;
A setting circuit having a set key that is operated when it is desired to set a load current detected by the current detection circuit as a setting target current value;
A storage circuit for storing a load current detected by the current detection circuit based on an operation of the set key as a set target current value;
The set target current value stored in the storage circuit and the instantaneous load current value detected by the current detection circuit are compared and calculated, and the change rate of the instantaneous load current value with respect to the set target current value is not less than a predetermined value. A logical operation circuit that outputs an abnormal signal when it continues for more than an hour,
And a display circuit for displaying the abnormal signal by the logic operation circuit,
While displaying the abnormal state of the load current ,
In response to load switching, a trigger signal with an identification code is input to the logic operation circuit in response to load switching, and the logic operation circuit is detected by the current detection circuit based on the trigger signal with the identification code. A load current monitoring device in which each load current is stored in the storage circuit as a set target current value with an identification code . 前記論理演算回路は、前記異常信号の回数を積算し、前記表示回路に前記異常信号の回数を表示させるようにした請求項２記載の負荷電流監視装置。  3. The load current monitoring device according to claim 2, wherein the logic operation circuit accumulates the number of abnormal signals and causes the display circuit to display the number of abnormal signals.
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KR101350619B1 (en) * 2012-10-05 2014-01-13 한국수력원자력 주식회사 Method for detecting false signal of power sistem
US9829542B2 (en) * 2014-05-15 2017-11-28 Microchip Technology Incorporated Circuit for measuring power violations using high side current sensing
JP6694517B2 (en) * 2016-10-26 2020-05-13 日立オートモティブシステムズ株式会社 In-vehicle control device
CN108879912B (en) * 2018-07-28 2021-08-10 安徽诚意电气科技有限公司 Intelligent regulation and control system of circuit breaker based on load current detection
JP7302518B2 (en) * 2020-03-31 2023-07-04 ブラザー工業株式会社 Numerical controller

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129813A (en) * 1973-04-18 1974-12-12
JPH0362107A (en) * 1989-07-31 1991-03-18 Toshiba Corp Power unit with overload detecting function
JPH07245987A (en) * 1994-03-04 1995-09-19 Tsubakimoto Chain Co Load monitoring apparatus
JPH09196987A (en) * 1996-01-18 1997-07-31 Nec Eng Ltd Method and apparatus for monitoring state of load
JP2004219171A (en) * 2003-01-10 2004-08-05 Matsushita Electric Works Ltd Information on equipment specifying device and characteristic amount detecting device for load equipment
JP2005034810A (en) * 2003-07-18 2005-02-10 Komatsu Denki Sangyo Kk Management system in water treatment plant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129813A (en) * 1973-04-18 1974-12-12
JPH0362107A (en) * 1989-07-31 1991-03-18 Toshiba Corp Power unit with overload detecting function
JPH07245987A (en) * 1994-03-04 1995-09-19 Tsubakimoto Chain Co Load monitoring apparatus
JPH09196987A (en) * 1996-01-18 1997-07-31 Nec Eng Ltd Method and apparatus for monitoring state of load
JP2004219171A (en) * 2003-01-10 2004-08-05 Matsushita Electric Works Ltd Information on equipment specifying device and characteristic amount detecting device for load equipment
JP2005034810A (en) * 2003-07-18 2005-02-10 Komatsu Denki Sangyo Kk Management system in water treatment plant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7432384B2 (en) 2020-02-05 2024-02-16 日本メクトロン株式会社 Printed board

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