JP5765736B2 - Current limiter current indicator - Google Patents

Description

  The present invention measures the current used downstream of the current limiter, displays the amount of current (load current) applied to the current limiter, and the load current (overcurrent) exceeds the rated current (contract capacity). The present invention relates to a current indicator capable of notifying that, if present, storing the value of the load current and the like on the time axis, and displaying and processing the average value and the like as necessary.

  The electric power supplied from the electric power company is supplied to customers such as general houses and business establishments through the outdoor power transmission network. Then, the electric power supplied to the customer is fed from the outdoor power transmission network to the customer's demand facility after passing through the current limiter inside the customer. The current limiter is provided so that the electric power supplied from the electric power company does not exceed the contract amount (ampere value) determined by the contract concluded in advance between the electric power company and the customer. is there.

  Therefore, the current limiter operates so as to cut off the supply of power when the amount of power demand of the consumer increases and exceeds the contracted contract amount.

  However, when such power interruption occurs, the supply of power to all of the customer's power demanding facilities is suddenly cut off, which has the adverse effect of increasing the impact on the consumer.

  For example, when OA equipment such as a computer is used in an office or the like, data may be damaged or lost due to a sudden stop of power supply, and unexpected damage may occur. In addition, when using medical equipment or the like in a medical institution or general household, there is a possibility that life and health may be impaired due to a sudden stop of power supply. Also, even in ordinary households, all the operating electrical devices are stopped, which may cause problems in daily life.

  Conventionally, it has been possible to respond to such a sudden stop of power supply by adopting an uninterruptible power supply, a private power generation device, or the like.

  In addition, the current limiter does not immediately operate when the rated current exceeds the contracted amount and stops the power supply, but it depends on the value of the overcurrent until it operates after exceeding the rated current. A time delay is provided as a standard.

  As a means for preventing a sudden stop of power supply by using this grace time, in Japanese Patent Laid-Open No. 7-230590 (Patent Document 1), the current flowing through the indoor trunk circuit is in an overcurrent state. At the same time, an overcurrent state informing device and a distribution board have been proposed that allow the user to perceive the overcurrent state.

  Similarly, in Japanese Utility Model Publication No. 8-4626 (Patent Document 2), the amount of current flowing through the load is displayed in stages, and the region of the load current exceeding the rated current value of the current limiter is determined by the current limiter. There has been proposed a load current indicator which is divided into a warning area one step before current interruption and an overload area where the current limiter cuts off, and the display form is different for each division.

Japanese Patent Laid-Open No. 7-230590 No. 8-4626

  Sudden stoppage of power supply due to the operation of the current limiter is very harmful as described above, but as a countermeasure against it, it is expensive to install an uninterruptible power supply or a private power generator in advance. In particular, it was difficult to deal with ordinary households.

  In addition, the invention described in Japanese Patent Application Laid-Open No. 7-230590 is for notifying when the current flowing through the main circuit becomes an overcurrent state, but is incorporated into the main circuit and is simple. In addition, it did not have a notification function corresponding to the degree of the overcurrent state.

  In addition, the invention described in Japanese Utility Model Publication No. 8-4626 is capable of displaying to some extent according to the degree of the overcurrent state, but is supplied with power from a commercial power source and lacks simplicity. In addition, the current measurement results in real time are basically displayed as they are, and the measurement data has not been fully utilized.

  Moreover, there are many cases where the electricity usage contract between the consumer and the electric power company is made before the consumer uses the electrical equipment, and in particular, it is often difficult to predict the amount of power consumed in a general house. Therefore, if you have previously signed a usage contract that is larger than the actual power consumption, the amount paid to the power company will be excessive, while a contract that is smaller than the actual power consumption will be signed. If this is the case, the power supply is frequently cut off.

  Therefore, in consumers, knowing the peak of the current consumption of their own electricity demand equipment, preventing sudden interruption of power supply, and trying to use appropriate electricity through leveling the power used, etc. At the same time, in order to conclude an appropriate electricity usage contract, it was necessary to know the amount of electric power that it always uses. On the other hand, monitoring the amount of power that is always used has a large monitoring burden, and it would be beneficial if there was a simpler means.

  In addition, in the prior art, the load current measurement data is used for display as it is, and there is no calculation of the average value of the load current or measurement of the rate of change over time. Insufficient use as a means.

  The present invention has been made to solve these problems, and an object of the present invention is to activate the current limiter when the current applied to the current limiter is excessive or likely. Notifying customers before power interruption occurs, and knowing whether or not the contract amount currently contracted for lighting in ordinary households is appropriate by installing a simple device without knowledge of electricity An object of the present invention is to provide a current alarm device for a current limiter that can simulate whether or not the current limiter does not operate with a contract amount.

In order to solve the above problems, the present invention is an apparatus for measuring a current applied to a current limiter of a power line for indoor power feeding and notifying a use state of the current, and detecting a current of an output line of the current limiter Detection means, setting means for setting a time for obtaining an average value of the rated current of the current limiter and the current limiter, a current value detected by the current detection means, and the current limit set by the setting means The average current value within the time set by the setting means based on the current value detected by the comparative evaluation means and the current detection means for comparing and evaluating the rated current value of the measuring device and generating a necessary output signal according to the evaluation An average value calculating means for calculating the output signal, and an informing means for receiving the output signal from the comparative evaluation means and the output signal from the average value calculating means and notifying the same, for indoor power supply Operated by the internal power without the need for power supply from the power line, the comparison evaluation unit measures a temporal change in current according to said current limiter, from the result, the transition of the current according to said current limiter Predicting and evaluating whether or not there is a high probability that current will be interrupted by the current limiter, it is possible to change the output signal to the notification means according to the evaluation and perform more appropriate notification It is characterized by that.

  Further, according to the present invention, a storage means is connected to the comparative evaluation means, and when the current value detected by the current detection means exceeds the current value preset by the setting means, the storage means Read the time until the current is interrupted by the current limiter with reference to the stored current limiter specification table, and notify by the notification means according to the time until the current is interrupted by the current limiter The content can be selected.

  In the current alarm of the current limiter according to the present invention, it is possible to always display the magnitude of the load current or the ratio of the load current to the rated current, and the load current approaches the rated current of the current limiter. If it exceeds or exceeds this, it has a function of comparing and evaluating the degree of approach, etc., and notifying this according to the evaluation. For this reason, the consumer can always know the size of the load current used by the customer or the ratio of the load current to the rated current, and the load on the current limiter becomes excessive, and the current limiter is activated to supply power. When there is a high possibility of being cut off, it is possible to prevent the interruption of the power supply in advance by knowing this quickly and taking necessary measures such as reducing the amount of power used.

  In addition, the current alarm of the current limiter according to the present invention is operated by an internal power supply, and the load current can be easily read from the downstream of the current limiter regardless of a power failure, so that it can be easily installed and removed. is there. Therefore, the consumer can easily know the usage state of his / her power, and can be prepared for a sudden stop of power supply.

  In addition, since the present invention has a function of calculating and displaying the average value of the load current, the consumer can grasp the past power usage state. Therefore, based on this information, the consumer can use the power appropriately through leveling of the electricity usage, etc., and can also conclude an appropriate electricity usage contract, which has a great energy saving effect.

  Furthermore, in the present invention, it is possible to measure a temporal change of the load current and evaluate it, predict a transition of the load current in the future, and perform necessary notification based on the prediction. Therefore, for example, even when the load current is lower than the rated current of the current limiter, when the time change of the load current is measured and it is evaluated that the probability of power interruption due to the operation of the current limiter is high This can be notified. Therefore, when the rate of increase in the load current is large and the load applied to the current limiter exceeds 100%, this is notified, and in response to this, the customer has taken countermeasures. Even when there is not enough time, it is possible to secure a sufficient response time.

It is a front view of the current alarm of the current limiter which shows one Example of this invention. It is a block diagram which shows the internal structural example of the current alarm device which concerns on this invention. It is a conceptual diagram which shows an example of the future transition of the load current by the time transition of the load current and its extrapolation.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a front view of a current alarm 100 of a current limiter according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of its internal configuration. As shown in FIG. 1, a power switch 102, a set current change switch 103, a display change switch 104, a display means 105 using a plurality of display elements, a speaker 106, and the like are disposed on the front of the current alarm device 100. Yes.

  A current alarm 100 shown in FIG. 1 is connected to a power line downstream of the current limiter 555 shown in FIG. The current detection unit 201 uses a non-contact current transformer (CT) that can be easily attached to and detached from existing equipment, such as a split type or clamp type AC current sensor, and is downstream of the current limiter 555. On the side, the current (load current) IR applied to the current limiter 555 is detected.

  The power switch 102 switches on or off the power supply 301 (see FIG. 2) for operating the current alarm 100. In the current alarm 100, the power from the power line is used as the power source for operation. Is used, and an internal power source such as a storage battery disposed in the current alarm device 100 is used. Therefore, attachment and removal of the current alarm 100 are easy, and a consumer can easily use the current alarm 100.

  The setting current changeover switch 103 corresponds to one of the operation means 302 for performing setting in the setting means 202 (see FIG. 2). The rated current of the current limiter used in the comparative evaluation means 203 (see FIG. 2) is adjusted according to the rated current ISB of the current limiter 555 connected to the current alarm device 100 by the operation of the set current changeover switch 103. Set the current value IS.

  In this embodiment, a rotary switch is used as the set current changeover switch element, and a scale is displayed in a semicircular arc shape around the operation axis of the rotary switch. This scale represents the IS to be set by the current alarm 100, and is “10”, “15”, “20”, “30”, “40”, “50”, Each numerical value corresponding to the amperage of “60” is displayed.

  Therefore, when using this current alarm 100, the consumer, in principle, adjusts the set current to the numerical value of the corresponding amperage in accordance with the rated current ISB of the current limiter 555 connected to his / her demand facility. An operation for adjusting the changeover switch 103 is performed.

  When a current value is selected by the set current changeover switch 103, the selected rated current value IS is sent to the comparative evaluation means 203 shown in FIG. In the comparative evaluation means 203, based on the value of the rated current value IS, a current limit having a rated current corresponding to the rated current value IS from a storage means (not shown) provided in the current alarm device 100. The data DIS of the device specification table is read out. And in the said comparative evaluation means 203, after processing the electric current detected through the electric current detection means 201 with cheap and simple CT converter, AD converter, etc., the value of load current IR is calculated, and as described later, Comparison and evaluation of the value of the load current IR and the data DIS described in the standard table are performed. Based on the result, data HDI used in the notification means drive circuit 205 is generated, and the data HDI is sent to the notification means drive circuit 205, and the notification means 206 is operated in the notification means drive circuit 205. Signal HDS is output and displayed by the notification means 206 or an alarm sound is generated.

  At this time, if the rated current value IS is set to be lower than the rated current ISB of the current limiter 555 connected to the current alarm device 100, the consumer temporarily has a contract current lower than the current value. In this case, it is possible to perform a simulation as to whether or not power interruption occurs. That is, even if the current alarm 100 is operated based on the rated current value IS set lower than the rated current ISB of the current limiter 555, the load current IR is higher than the rated current value IS in a normal use state. If it does not become excessive, the alarm by the notification means 206 of the current alarm 100 is not made. Therefore, it is possible for a consumer to confirm that there is no problem even if the contract amount is lower than the contract amount currently contracted with the electric power company.

  Further, the display changeover switch 104 in FIG. 1 corresponds to one of the operation means 302 for performing setting in the setting means 202 (see FIG. 2), and the display contents by the display means 105 constituting the notification means 206 are displayed. It is a switch to switch.

  The display means 105 displays the approximate ratio of the current load current IR to the rated current value IS set by the current alarm 100 (RT display) or the rated current value IS set by the current alarm 100. The display of the approximate ratio (HA display) of the average value IA of the past load current IRL with respect to can be selected.

A slide switch element is used for the main display changeover switch 104, and the selection positions of the RT display and the HA display are assigned in order from the left to the right. Further, in the HA display selection part, numbers “6”, “12”, and “24” for selecting the time for the HA display to be traced back to the past from the present time are displayed. It is displayed. (Note that FIG. 1 shows a state where RT display is selected.)
When RT display is selected by the display changeover switch 104, what percentage of the rated current value IS selected by the setting means 202 corresponds to the current load current IR detected by the current detection means 201, Based on the result calculated by the comparison and evaluation means 203, data HDI used in the notification means drive circuit 205 is generated, and the data HDI is sent to the notification means drive circuit 205. Then, a signal HDS for operating the notification means 206 is output and displayed by the notification means 206 or an alarm sound is generated.

  When the HA display time is selected by the display changeover switch 104, the average value calculation means 204 shown in FIG. 2 calculates the average value IA of the past load current IRL based on the selected time. . That is, the average value calculation means 204 reads the value of the past load current IRL stored in the storage means (not shown) at an appropriate sampling interval, and goes back to the past by an amount corresponding to the selected time, The average value IA of the past load current IRL is calculated. Then, the calculated average value IA is compared with the rated current value IS set through the set current changeover switch 103 in the comparative evaluation means 203, and the percentage of the average value IA of the load current IRL with respect to the rated current value IS is obtained. Based on the calculation result, the display means 105 as one of the notification means 206 is driven. As a result, the consumer displays the approximate ratio of the average value IA of the past load current IRL to the rated current value IS by going back to the past by the amount corresponding to the selected time from the present. It can be known by means 105.

  The display means 105 using a plurality of display elements displays the results of the comparative evaluation means 203 to the average value calculation means 204, and together with the speaker 106 provided in the current alarm device 100, the notification means of FIG. 206 is configured.

  In the display means 105 of the present embodiment, the RT display described above, that is, the display of the approximate ratio of the current load current IR to the rated current value IS set by the current alarm 100, or the HA display, that is, the current The approximate ratio of the average value IA of the past load current IRL to the rated current value IS set by the alarm 100 is displayed in five stages. The display means 105 has five LEDs arranged in a horizontal row. In the vicinity of each LED, “10”, “25”, “50”, “75”, “100” are sequentially arranged from left to right. "Is written. These numbers represent the current load current IR applied to the current limiter 555 or the average value IA of the past negative overcurrent IRL as a percentage of the rated current value IS set by the current alarm 100. A number indicating whether it falls under is displayed.

Basic data to be used for display is generated by the comparative evaluation means 202 when performing the RT display, and is generated by the average value calculating means 204 and the comparative evaluation means 202 when performing the HA display. When performing the RT display, the comparison / evaluation unit 202 uses the load current IR obtained from the current detection unit 201 and the rated current value IS obtained from the setting unit 202 to determine the ratio of the current load current IR to the rated current value IS. Is determined as K ₁ = (IR / IS) × 100. When performing HA display, the average value calculation means 204 calculates the average value IA of the past load current IRL and sends the result to the comparison evaluation means 202. The comparison evaluation means 202 evaluates the rating of the IA. The ratio with respect to the current value IS is determined as K ₂ = (IA / IS) × 100. Then, in the comparative evaluation means 202, when collectively the K ₁ and K ₂ and expressed as K, depending on the value of K, for example, the evaluation and decision as follows performed.
When K ≦ 10% is evaluated, turn on the LED with “10”.
When it is evaluated that 10% <K ≦ 25%, an LED with a display of “25” is turned on, or an LED with an indication of “10” and “25” is turned on,
When it is evaluated that 25% <K ≦ 50%, turn on the LED with the display of “50” or turn on all the LEDs with the display of “50” or less.
When it is evaluated that 50% <K ≦ 75%, the LED with the display of “75” is turned on, or all the LEDs with the display of “75” or less are turned on.
When it is evaluated that 75% <K ≦ 100%, the LED having the display of “100” is turned on, or all the LEDs having the display of “100” or less are turned on.

  Then, the comparison evaluation unit 203 generates data HDI used in the notification unit drive circuit 205 according to the evaluation and determination, and the data HDI is sent to the notification unit drive circuit 205, and the notification unit drive circuit 205 Then, a signal HDS for operating the display means 105 which is one of the notification means 206 is output, and the display by the display means 105 is performed.

  Note that the LED used as the display element of the display means 105 can be selected to blink instead of lighting. Especially when an overcurrent occurs, the LED blinking speed, brightness, etc. are notified together with the notification by the speaker 106. It is also possible to change and notify the customer. It is also possible to provide a separate lighting switch so that only when the lighting switch is pressed, display by the LED of the display means 105 constituting the notification means 206 is performed. For example, when it is not necessary to constantly view the display by the display means 105, the power consumption of the current alarm device 100 can be saved by operating the lighting switch only when necessary. Is possible.

  The speaker 106, together with the display unit 105 described above, constitutes the notification unit 206 shown in FIG. 2, and is mainly activated when the load current IR exceeds the rated current value IS set by the setting unit 202. To do. The notification by the speaker 106 can have different contents depending on how much the load current IR exceeds the rated current value IS set by the current alarm 100 by a percentage.

  Here, as an example of the operating characteristics of a general single-phase three-wire current limiter, when the load current applied to the current limiter is IF and the rated current of the current limiter is I, L = (IF / I) × 100, the operation of the current limiter is, for example, as shown in the following Table 1 according to the value of L.

(Table 1)
L <120% Non-operation 120% <L <150% Operation in 55 minutes 150% <L <190% Operation in 30 minutes 190% <L <400% Operation in 1 minute 50 seconds 400% <L <600% 25 seconds Operates at 600% <L 3 seconds

When this is applied to the current alarm 100, the load current IR corresponds to the load current IF, and the rated current value IS corresponds to the rated current I. Therefore, the above L corresponds to the value of K ₁ described above, and the above operating characteristic example can be read as it is as the operating characteristic of the current limiter having the rated current value IS set by the current alarm 100. I can do it. Therefore, the comparison and evaluation means 203 of the current alarm device 100 measures and calculates how much the load current IR exceeds the rated current value IS set by the current alarm device 100 in terms of percentage, and this is 100%. If it exceeds, it is applied to the above L for comparative evaluation, the content of notification by the speaker 106 is determined, data HDI used for the notification means driving circuit 205 is generated, and the data is driven by the notification means. The signal HD is sent to the circuit 205, and the notification means drive circuit 205 outputs a signal HD for operating the notification means 206 to drive the speaker 106 as the notification means 206.

  Any notification content by the speaker 106 may be used. For example, when L <120%, the current limiter 555 is not activated immediately and the power supply is not stopped. Is possible. In addition, even when current use continues as in the case of 120% <L <190%, there is a margin of 10 minutes or more after L enters the range until the current limiter 555 is activated. The evaluation and evaluation means 203 evaluates how much time is available until the current limiter 555 operates, and according to this, the time until the power supply is cut off is intermittently determined by the speaker 106. It is also possible to notify by. In the case of 190% <L, since the time until the power supply is stopped is short, a warning sound such as a buzzer sound is notified together with the notification by the speaker 106 in order to notify the consumer that the emergency response is necessary. Combined use is also possible.

  Note that a buzzer or the like may be provided instead of the speaker 106. In that case, depending on the range to which L belongs, the volume of the buzzer, the buzzer ringing time, the interval thereof, and the like can be made different, thereby notifying the consumer of the overcurrent state.

  In this embodiment, the HA display and the RT display are performed by the notification means 206. However, according to the present invention, the contents to be specifically notified and the specific notification means are not limited to this embodiment. Absent. For example, the contents to be specifically notified include comparative evaluation such as the average value of the past used current, in addition to the numerical value of the load current IR and the average value IA sent from the comparative evaluation means 203 and the average value calculation means 204. It is possible to arbitrarily select from data generated by means 203, average value calculation means 204, etc., alarms, etc. as required.

  In addition, as the notification means 206, there is mainly visual or auditory means, but it is also possible to use olfactory means such as spraying different fragrances depending on the contents of the notice, corresponding to the visually impaired. is there. Specifically, a speaker, a buzzer, or the like can be provided as in this embodiment to provide an audible notification means. In addition, as a visual notification means, a plurality of elements such as LEDs can be provided as in this embodiment, and they can be turned on or blinked, and display by a level meter or a liquid crystal display device is arbitrarily selected. Is possible. Further, it is possible to use both visual and auditory informing means and olfactory informing means. In addition, in the visual method, the number of lighting of a display element such as an LED used as the notification unit 206 is proportionally increased according to the magnitude of the load current or the like, or a level meter or a liquid crystal display is used. There is a notification method for changing the display content of an element. In addition, in the notification method using the auditory sense by the speaker or the like, in addition to transmitting the voice guidance set in advance by the speaker, the buzzer is operated continuously or intermittently, and the duration, the intermittent time or the volume is set. The method of changing can be selected.

  In addition, since the current alarm device 100 is installed in the vicinity of the current limiter 555, if the consumer is not near the current current alarm device 100, even if the occurrence of overcurrent is notified, Sudden interruption of power may occur because the customer cannot take appropriate measures. For this reason, the notification means 206 can be configured to be separable from the current notification device 100, or can be configured separately from the current notification device 100 and controlled from the current notification device 100 wirelessly or by wire. It is. Thereby, even if the consumer is at a place away from the current alarm device 100, the consumer can receive the notification from the current alarm device 100 and take necessary measures to prevent sudden interruption of the power supply.

  When the notification unit 206 is configured to be separable from the current notification unit 100, in the normal state, the notification unit 206 is integrated with the current notification unit 100 via a connector provided for connection. However, it is also possible to configure so that the notification means 206 can be separated from the current notification device 100 when the connector is released. At this time, the connector may be mechanical or may also serve as an electrical connection terminal.

  The notifying unit 206 separated from the current notifying device 100 can be configured to receive information from the current notifying device 100 wirelessly or by wire. A signal HDS for operating the notifying means 206 from the means driving circuit 205 is transmitted by a transmitter built in the current notifying device 100, received by a receiver provided in the notifying means 206, and is sent to the notifying means 206. Operate. Further, when using a cable for controlling the notification means 206, in addition to directly connecting a cable that directly sends the signal from the notification means drive circuit 205 to the notification means 206, an external device that sends the signal from the notification means drive circuit 205 to the outside. It is also possible to control the notification means 206 by providing a connection terminal in the current alarm 100 and connecting it to a connector provided in the notification means 206 via an extension cord or the like.

  Further, the notification means 206 is not configured so as to be separable from the current notification device 100, but when the configuration provided separately from the current notification device 100 is adopted, the notification means 206 from the current notification device 100 by radio or wire can be used. Control can be possible. When controlling the notification means 206 by wire, as in the case where the notification means 206 is configured to be separable from the current notification device 100, an external connection terminal for sending a signal from the notification means drive circuit 205 to the outside is used. It is also possible to use a means for controlling the notifying unit 206 by connecting to the notifying unit 206 provided separately from the main body of the current notifying unit 100 via the current notifying unit 100. Further, when controlling the notification means 206 by radio, a signal for operating the notification means from the notification means drive circuit 205 is provided, as in the case where the notification means 206 is configured to be separable from the current notification device 100. The HDS is transmitted by a transmitter built in the current alarm device 100 and is received by a receiver provided in the notification device 206 to activate the notification device 206.

  In this embodiment, the comparison / evaluation unit 203 mainly compares and evaluates the current or past load current IR and the rated current value IS, but the comparison / evaluation unit 203 uses the current detection unit 201. It is also possible to measure the temporal change of the current value measured by the above and to evaluate it. That is, by measuring the change between the measured current value and the current value measured immediately before it, the result is stored in the storage means and used for evaluation, thereby predicting future fluctuations in the load current IR. It can be used for notification based on the prediction. This will be specifically described below with reference to FIG.

  (A) to (c) of FIG. 3 extrapolate and display the temporal transition of the future load current IR based on the temporal transition of the load current IR and the temporal transition of the past load current IR at a certain time. It is the conceptual diagram of the future prediction of the load current IR. In the figure, the horizontal axis represents time (T), the vertical axis represents the value of the load current IR (IR), and the AL indicated on the vertical axis indicates that the load current IR exceeds the rated current value IS and an alarm is started by the notification means 206. NA is an upper limit value of the non-operation current of the current limiter 555, and SD is a current value at which current is immediately interrupted by the operation of the current limiter 555. The solid line in the figure represents the actually measured value of the load current IR, and the alternate long and short dash line represents the extrapolated value.

  Of these, FIG. 3 (a) shows that the measured load current IR was greatly lower than the rated current value IS, but the amount of the load current IR increased from a certain point in time, and the load current IR increased with time. This is a case where the rate is large and it is determined from the extrapolated value of the load current IR that the probability of exceeding the operating current SD of the current limiter 555 is high within a short time. Here, the time point t1 indicates the time when the extrapolated value is calculated (the same applies to FIGS. 3B and 3C), and the time point t2 becomes the AL value when the load current IR value changes with the extrapolated value. The time t3 indicates the time when the value of SD is reached when the value of the load current IR changes with the extrapolated value. In such a case, if the temporal variation of the load current IR changes according to the predicted extrapolation value, in a normal case, even if the temporal increase rate of the load current IR is large, the customer is not No notification is given, and a warning is issued to the consumer at time t2, and the consumer takes measures to prevent current interruption due to the operation of the current limiter 555 in a short time (t3-t2). Therefore, sufficient measures may not be taken when the time increase rate of the load current IR is large. On the other hand, in the case of the current alarm device 100, it is possible to predict the future transition of the load current IR from the change of the load current IR temporal variation at the time t1, and an alarm is given at the time t1. By issuing, the consumer can obtain a sufficient response time of (t3-t1) in order to prevent current interruption due to the operation of the current limiter 555.

  In FIG. 3B, the load current IR value exceeds AL, but the rate of increase of the load current IR decreases thereafter, and there is a temporal variation between the load current value AL and the load current value NA. There are few cases where a stable transition is predicted even with the extrapolated value calculated at time t1. In this case, although the value of the load current IR exceeds the rated current value IS, since it is within the range of the non-operation current value of the current limiter 555, the operation by the current limiter 555 does not occur immediately. Therefore, the notifying means 205 can notify the consumer that the power supply is not immediately interrupted even with the current power usage, and the consumer can effectively use the power.

  In FIG. 3C, the value of the load current IR exceeds NA and is closer to SD. However, the time reduction rate of the load current value IR increases due to the customer's response and the like, and the time t1 According to the extrapolated value calculated in step 1, if the rate of decrease is as it is, it is predicted that it will fall below the value of the load current AL, or will remain in the region between the load current AL and the load current NA. It is. In this case, even if the notification (warning) is performed by the notification unit 206, the content of the notification by the notification unit 206 is changed so that the supply of power is not immediately cut off even with the current power use. You can inform the house. Therefore, even if the consumer has taken action to suppress power consumption by the notification by the notification means 206, the power consumption is suppressed more than necessary because the negative overcurrent IR exceeds the rated current IS. This can be avoided, and the effective use of power can be achieved.

  In order to improve the prediction accuracy based on the extrapolated value, the comparative evaluation unit 203 stores the extrapolated value of the predicted load current IR in the storage unit, and the predicted extrapolated value and the subsequent extrapolated value are stored. It is also possible to make a configuration in which an actual measurement value of the load current IR is compared and evaluated, and the result is stored and used for prediction of the next load current IR.

  Although not shown in the present embodiment, the current alarm 100 can be provided with an interface for external input / output. The external input / output interface is a device for inputting / outputting information between the current alarm 100 and an external home energy management system, home automation system, or personal computer. With this device, the value of the load current IR measured or processed by the current alarm device 100 or the average value IA of the past load current can be used by a device connected to the outside of the current alarm device 100. Data for this can be generated and converted by the comparative evaluation means 203 or the average value calculation means 204. In addition, with this device, remote operation for setting the current alarm 100 or changing the standard content of the current limiter 555 stored in the storage means is possible without operating the current alarm 100 main body. Is possible. When operating the current alarm 100 from a remote location, it is possible to prioritize external operation over direct operation by the current alarm 100 main body. In this case, it is possible to return to the setting that gives priority to the operation by the main body of the current alarm device 100 by the return command by the operation from the outside or the operation of the return switch provided in the main body of the current alarm device 100. It can also be set as the structure to do. It is also possible to set an appropriate password for using the external input / output interface of the current alarm 100.

  The current alarm of the current limiter according to the present invention can be easily installed in front of power distribution facilities of electric power consumers including ordinary households, and can prevent electric power outages due to excessive use of electric power, Useful for saving usage.

DESCRIPTION OF SYMBOLS 100 Current alarm device 102 Power switch 103 Setting current changeover switch 104 Display changeover switch 105 Display means 106 Speaker 201 Current detection means 202 Setting means 203 Comparison evaluation means 204 Average value calculation means 205 Notification means drive circuit 206 Notification means 301 Power supply 555 Current limiter 666 Distribution panel AL Current value when load current exceeds rated current and alarm is started by notification means NA Upper limit value SD of current limiter inoperable current Current value at which current is immediately interrupted by current limiter operation t1 Time when extrapolated value is calculated t2 Time when the load current value changes with the extrapolated value t3 Time when the load current value changes with the extrapolated value Time when reaching the SD value
IR load current ISB Rated current IS of current limiter 555 Rated current value DIS of current limiter used in comparison and evaluation means 203 Data of current limiter specification table HDI Data used in notification means drive circuit 205 Activate HDS notification means 206 Signal IRL for past load current IA Average value of past load current IF Load current applied to a general single-phase three-wire current limiter I Rated current of a general single-phase three-wire current limiter

Claims (2)

A device that measures the current applied to the current limiter of the power line for indoor power supply and informs the current usage state,
Current detection means for detecting the current of the output line of the current limiter;
Setting means for setting a time for obtaining a rated current of the current limiter and an average value of current applied to the current limiter, a current value detected by the current detection means, and a rated current of the current limiter set by the setting means An average for calculating an average current value within a time set by the setting means based on a current value detected by the comparison evaluation means and the current detection means for generating a required output signal according to the evaluation. Value calculation means,
Receiving means capable of receiving an output signal from the comparative evaluation means and an output signal from the average value calculating means and notifying the same;
Operates with an internal power supply without the need for power from the indoor power line .
In the comparative evaluation means, the temporal change of the current applied to the current limiter is measured, and the transition of the current applied to the current limiter is predicted from the result, and the current is likely to be interrupted by the current limiter. It is possible to evaluate whether or not is high, change the output signal to the notification means according to the evaluation, it is possible to perform more appropriate notification ,
Current limiter current indicator. A storage means is connected to the comparison evaluation means, and a current limiter stored in the storage means when the current value detected in the current detection means exceeds a current value preset in the setting means. The time until the current is interrupted by the current limiter is read with reference to the standard table, and the notification content by the notification means is selected according to the time until the current is interrupted by the current limiter. The current alarm of the current limiter according to 1.

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