WO2009101711A1 - 負荷電流監視装置及び負荷電力監視装置 - Google Patents
負荷電流監視装置及び負荷電力監視装置 Download PDFInfo
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- WO2009101711A1 WO2009101711A1 PCT/JP2008/058838 JP2008058838W WO2009101711A1 WO 2009101711 A1 WO2009101711 A1 WO 2009101711A1 JP 2008058838 W JP2008058838 W JP 2008058838W WO 2009101711 A1 WO2009101711 A1 WO 2009101711A1
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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
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- 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
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- 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).
- 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).
- 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.
- a load current monitoring device 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. The change rate of the instantaneous load current value with respect to the value is displayed.
- the load current monitoring device 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
- a display circuit for displaying the abnormal signal by a logic operation circuit is provided, and an abnormal state of the load current is displayed.
- the load power monitoring apparatus includes a current detection circuit and a voltage detection circuit for detecting a load power to be monitored, and a 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 that is operated when it is desired to set, 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 the storage circuit
- a logic operation circuit that compares and calculates the set target power value stored in step 1, the instantaneous load power value detected by the current detection circuit and the voltage detection circuit, and outputs the change rate of the instantaneous load power value with respect to the set target power value
- a display circuit for displaying the rate of change by the logic operation circuit, and an instantaneous negative with respect to a set target power value It is for displaying the rate of change of the power value.
- the load power monitoring device includes a current detection circuit and a voltage detection circuit for detecting the load power to be monitored, and the 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 that is operated when it is desired to set, 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 the storage circuit
- the set target power value stored in step S3 is compared with the instantaneous load power value detected by the current detection circuit and the voltage detection circuit, and the change rate of the instantaneous load power value with respect to the set target power value is a predetermined value or more.
- a logical operation circuit that outputs an abnormal signal when the signal continues for a predetermined time or more, and the abnormal signal by the logical operation circuit is displayed. It comprises a display circuit which is for displaying an abnormal state of the load power.
- 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.
- 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
- the actual load current is easily stored as the set target current value, and the rate of change from the instantaneous load current value is less than the predetermined value. Displaying monitor an abnormal state when the state continues for a predetermined time or more.
- the setting circuit having a set key that is operated when it is desired to set the load power detected by the current detection circuit and the voltage detection circuit as the set target power value, the operation of the set key
- a storage circuit that stores load power detected by the current detection circuit and the voltage detection circuit as a set target power value, a set target power value stored by the storage circuit, the current detection circuit, and the voltage detection circuit
- a logical operation circuit that compares and calculates the instantaneous load power value detected in step, outputs a change rate of the instantaneous load power value with respect to a set target power value, and a display circuit that displays the change rate by the logical operation circuit. Therefore, the actual load power can be easily stored as the set target power value, and the rate of change from the instantaneous load power value can be displayed and monitored. That.
- the current detection circuit and voltage detection circuit for detecting the load power to be monitored, the load power detected by the current detection circuit and the voltage detection circuit are set target power value A setting circuit having a set key that is operated when it is desired to be set, 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 the storage
- the set target power value stored in the circuit is compared with the instantaneous load power value detected by the current detection circuit and the voltage detection circuit, and 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 the state continues for a predetermined time or more, and displays the abnormal signal by the logical operation circuit
- the actual load power is easily stored as the set target power value, and an abnormal state is displayed when the rate of change from the instantaneous load power value is greater than or equal to the predetermined value for a predetermined time or longer. Can be monitored.
- FIG. 1 is a configuration circuit diagram showing a load current monitoring device according to Embodiment 1 of the present invention.
- FIG. 6 is a waveform diagram for explaining the operation in the load current monitoring apparatus of the first embodiment.
- 4 is a diagram illustrating a screen example of a display circuit in the load current monitoring apparatus according to Embodiment 1.
- FIG. FIG. 10 is a waveform diagram for explaining an operation in the load current monitoring apparatus of the second embodiment.
- FIG. 10 is a waveform diagram for explaining an operation in the load current monitoring apparatus according to the third embodiment.
- FIG. 10 is a waveform diagram for explaining the operation in the load current monitoring apparatus of the fourth embodiment.
- 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.
- 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.
- 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.
- an identification code for example, trigger 1, trigger 2, trigger 3, trigger 4, etc.
- 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.
- the 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.
- 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
- 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.
- 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.
- 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)
- FIG. 3 is a diagram showing a screen example of the display circuit in the load current monitoring apparatus of 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.
- an analog bar graph is displayed based on a swing rating of 10%. In the figure, up to 12% of the analog bar graph 43 is displayed, and the current 7% is displayed with seven scales 44.
- 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.
- 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.
- the load can be stabilized depending on how many times the abnormal signal is generated. The degree can be monitored.
- FIG. FIG. 5 is a waveform diagram for explaining the operation of the load current monitoring apparatus according to the third embodiment.
- 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.
- 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.
- FIG. FIG. 6 is a waveform diagram for explaining the operation of the load current monitoring apparatus according to the fourth embodiment.
- the load current detected at the time Tm between the times tg1 and 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.
- Embodiment 5 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.
- electric power is detected from the current detection circuit and the voltage detection circuit, both circuits are equivalent to the power detection circuit.
- 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.
- 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 logic operation circuit that outputs an abnormality signal when continuing, and a display circuit that displays the abnormality signal by the logic operation circuit , And displays the abnormal condition of the load power.
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Abstract
Description
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。
この発明の上記以外の目的、特徴、観点及び効果は、図面を参照する以下のこの発明の詳細な説明から、さらに明らかになるであろう。
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。
。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。
、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。
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。
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。
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。
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。
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。
Claims (7)
- 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ようにした負荷電流監視装置。 - 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ようにした負荷電流監視装置。 - 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。
- 負荷を切替えるときは、負荷の切替えに応じて設定ターゲット電流値をそれぞれ設定するようにした請求項1~請求項3のいずれか1項に記載の負荷電流監視装置。
- 設定ターゲット電流値として負荷電流の平均値を用いるようにした請求項1~請求項3のいずれか1項に記載の負荷電流監視装置。
- 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ようにした負荷電力監視装置。 - 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ようにした負荷電力監視装置。
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JP2009553326A JP5147864B2 (ja) | 2008-02-14 | 2008-05-14 | 負荷電流監視装置及び負荷電力監視装置 |
KR1020107009334A KR101156336B1 (ko) | 2008-02-14 | 2008-05-14 | 부하 전류 감시 장치 및 부하 전력 감시 장치 |
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JPH0362107A (ja) * | 1989-07-31 | 1991-03-18 | Toshiba Corp | 過負荷検出機能付電源装置 |
JPH07245987A (ja) * | 1994-03-04 | 1995-09-19 | Tsubakimoto Chain Co | 負荷監視装置 |
JPH09196987A (ja) * | 1996-01-18 | 1997-07-31 | Nec Eng Ltd | 負荷状態監視方法および装置 |
JP2004219171A (ja) * | 2003-01-10 | 2004-08-05 | Matsushita Electric Works Ltd | 機器情報特定装置及び負荷機器特徴量検出装置 |
JP2005034810A (ja) * | 2003-07-18 | 2005-02-10 | Komatsu Denki Sangyo Kk | 水処理施設の管理システム |
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JPS49129813A (ja) * | 1973-04-18 | 1974-12-12 | ||
JPH0362107A (ja) * | 1989-07-31 | 1991-03-18 | Toshiba Corp | 過負荷検出機能付電源装置 |
JPH07245987A (ja) * | 1994-03-04 | 1995-09-19 | Tsubakimoto Chain Co | 負荷監視装置 |
JPH09196987A (ja) * | 1996-01-18 | 1997-07-31 | Nec Eng Ltd | 負荷状態監視方法および装置 |
JP2004219171A (ja) * | 2003-01-10 | 2004-08-05 | Matsushita Electric Works Ltd | 機器情報特定装置及び負荷機器特徴量検出装置 |
JP2005034810A (ja) * | 2003-07-18 | 2005-02-10 | Komatsu Denki Sangyo Kk | 水処理施設の管理システム |
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CN101910851B (zh) | 2013-09-18 |
JPWO2009101711A1 (ja) | 2011-06-02 |
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CN101910851A (zh) | 2010-12-08 |
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