JP2020089072A - Average current control system - Google Patents

Abstract

To provide an average current control system which is a system for reducing an electricity charge adaptable for a small customer for a main switch contraction.SOLUTION: An average current control system comprises: a circuit breaker for preventing an over current from flowing in a power load; current measurement means 26 of measuring a current flowing in the power load; movement average current calculation means 42 of calculating a movement average current value on the basis of the measurement current; average current comparison means 44 of comparing the movement average current value with a caution average current value set on the basis of a tripping current value in an over current operation characteristic of the circuit breaker; and partial stop signal generation means 46 of generating a partial stop signal for stopping a part of operations in an adjustment power load 18. When the movement average current value exceeds the caution average current value, the partial stop signal generation means generates the partial stop signal, and a part of operations in the adjustment power load is forcibly stopped.SELECTED DRAWING: Figure 3

Description

The present invention relates to an average current control system that suppresses power consumption by controlling an average current flowing through a circuit breaker for wiring.

A demand control system for controlling power supplied to a power load to suppress power consumption has been proposed (for example, see Patent Document 1). The demand control system includes a demand power monitoring system that monitors demand power, and operates a part or all of an adjustable adjustable power load among the power loads based on the demand power information from the demand power monitoring device. By stopping the operation, the maximum power consumption during the predetermined period is suppressed to reduce the power charge. In this demand power monitoring system, the predetermined period is divided into a plurality of partial periods, and part or all of the adjusted power load is adjusted based on the partial period demand power in these partial periods and the partial period target demand power corresponding to these partial periods. By stopping the operation as required and controlling in this way, the regulated power load is efficiently operated and the power consumption during the predetermined period is prevented from exceeding the demand power.

JP, 2008-11637, A

The power supply from the electric power company is a customer who receives high-voltage power (for example, a large customer such as a large factory or a large store) and a low-voltage customer (for example, a small or medium-sized factory or a small or medium-sized shop). The above demand control system can be conveniently applied to the large-scale consumer depending on the contract contents regarding the electricity rate with the electric power company, but it is applied to the small-scale consumer as it is. Can not do it.

To explain further, for small-lot consumers, the content of the contract regarding the electricity rate with the electric power company is to calculate the contract current by multiplying the total capacity of the load equipment by a coefficient (load equipment contract) and the rated current value of the main switch. There is a method of determining the contract current based on (main switch contract), and the basic rate of the electricity rate is determined by any of these contract contents.

For small-lot customers who have signed this main switch contract with an electric power company, the capacity of this main switch is set because the basic rate of electricity charges is determined by the capacity of the main switch installed in the customer. By making it the necessary minimum, the basic charge can be reduced, and it is desired to realize a system for reducing the electricity charge even for such a small consumer.

An object of the present invention is to provide an average current control system, which is a system for reducing electricity charges, which is suitable for small customers for main switch contracts.

The average current control system according to claim 1 of the present invention includes a wiring breaker for preventing an overcurrent from flowing in a power load, and a current measuring unit for measuring a current flowing in the power load. Moving average current calculating means for calculating a moving average current value based on the measured current measured by the current measuring means, the moving average current value calculated by the moving average current calculating means, and the overcurrent of the wiring breaker. Average current comparing means for comparing with the cautionary average current value set based on the tripping current value in the operating characteristics, and a partial stop for stopping the operation of a part of the adjusted power load whose operation can be adjusted among the power loads. A part stop signal generating means for generating a signal,
When the moving average current value exceeds the caution average current value, the partial stop signal generation means generates the partial stop signal, and based on the partial stop signal, a part of the adjusted power load is forced. It is characterized in that it is deactivated.

Further, in the average current control system according to claim 2 of the present invention, the moving average current calculation means is an overcurrent trip operation time corresponding to a trip current value in the overcurrent operation characteristic of the wiring breaker. The moving average current value in is calculated.

Further, in the average current control system according to claim 3 of the present invention, a warning average current value larger than the caution average current value is set based on the trip current value in the overcurrent operation characteristic of the wiring breaker, In relation to the warning average current value, an all-stop signal generating means for generating an all-stop signal for deactivating all of the regulated power loads is provided, and the average current comparing means is provided for the moving average current. The moving average current value calculated by the calculating means is compared with the warning average current value, and when the moving average current value exceeds the warning average current value, the all stop signal generating means generates the all stop signal. However, all of the regulated power loads are forcibly deactivated based on the all-stop signal.

Further, in the average current control system according to claim 4 of the present invention, the regulated power loads are divided into first to third power load groups, and in this connection, the caution average current value is low. An attention average current value and a high attention average current value larger than the low attention average current value are set, and the partial stop signal generation means is configured to generate a first partial stop signal corresponding to the low attention average current value and the partial stop signal. A second partial stop signal corresponding to a high-attention average current value is generated, and the average current comparison unit is configured to calculate the moving average current value calculated by the moving average current calculation unit, the low-attention average current value, and the high-attention average current value. The caution average current value and the warning average current value are compared, and when the moving average current value exceeds the low caution average current value, the partial stop signal generating means generates the first partial stop signal. , If the first power load group in the regulated power load is forcibly deactivated based on the first partial stop signal, and the moving average current exceeds the high caution average current value, The partial stop signal generation means generates the second partial stop signal, and the first and second electric power load groups in the regulated electric power load are forcibly stopped based on the second partial stop signal. Further, when the moving average current exceeds the warning average current value, the all stop signal generating means generates the all stop signal, and based on the all stop signal, the first to the first in the adjusted power load. 3 power load groups are forcibly deactivated.

Further, in the average current control system according to claim 5 of the present invention, the first and second tripping current values are set based on the overcurrent operation characteristic of the wiring breaker, and the moving average current calculating means is set. Calculates the first and second moving average current values during the first and second overcurrent trip operation times set based on the first and second trip current values, and the average current comparison means The first moving average current value is compared with a first attention average current value set based on the first tripping current value, and the second moving average current value and the second tripping current value are compared. The second moving average current value exceeds the first moving average current value, or the second moving average current value exceeds the second moving average current value. When it exceeds, the partial stop signal generation means generates the partial stop signal, and based on the partial stop signal, a part of the regulated power load is forcibly stopped.

Further, in the average current control system according to claim 6 of the present invention, a first larger average current value than the first caution average current value based on the first tripping current value in the overcurrent operation characteristic of the wiring breaker. A warning average current value is set, and a second closing average current value that is larger than the second attention average current value is set based on the second tripping current value, and the first and second warning average current values are set. Related to, all stop signal generating means for generating all stop signal for stopping all of the regulated power load is provided, and the average current comparing means is calculated by the moving average current calculating means. And comparing the first and second moving average current values with the first and second warning average current values, and the first moving average current value exceeds the first warning average current value, or the second moving average current value. When the average current value exceeds the second warning average current value, the all-stop signal generating means generates the all-stop signal, and based on the all-stop signal, all of the regulated power loads are forcibly stopped. It is characterized by being done.

According to the average current control system of the present invention, the moving average current calculating means calculates the moving average current value, and the average current comparing means calculates the moving average current value and the overcurrent operation of the circuit breaker for wiring. When the moving average current value exceeds the caution average current value, which is set based on the tripping current value in the characteristic, and the moving average current value exceeds the caution average current value, the partial stop signal generation means generates the partial stop signal generation signal. To do. Therefore, when the moving average current value approaches the tripping current value of the circuit breaker for wiring, a partial stop signal is generated, and based on this partial stop signal, part of the adjusted power load is forcibly stopped. It is possible to prevent the moving average current value from further approaching the tripping current value of the wiring breaker, and prevent current interruption of the wiring breaker. This means that even if a circuit breaker with a small capacity (for example, one with a smaller capacity) is used, the current interruption due to overcurrent is suppressed, and as a result, the basic rate of the electricity rate under the contract with the power company is reduced. It can be lowered to reduce the total electricity bill.

Further, according to the average current control system of the second aspect of the present invention, the moving average current calculation means is in the overcurrent trip operation time corresponding to the trip current value in the overcurrent operation characteristic of the circuit breaker for wiring. Since the moving average current value is calculated, this caution average current value takes into consideration the trip current value in the overcurrent operation characteristic, and the trip current value is, for example, about 70 to 80% (for example, about 75%). ) Can be.

According to the average current control system of claim 3 of the present invention, a warning average current value larger than the caution average current value is set based on the trip current value in the overcurrent operation characteristic of the wiring breaker, The average current comparing means compares the moving average current value calculated by the moving average current calculating means with the warning average current value, and when the moving average current value exceeds the warning average current value, all the stop signal generating means are operated. Generate a stop signal. Therefore, when the moving average current value further approaches the tripping current value of the circuit breaker for wiring, an all-stop signal is generated, and based on this all-stop signal, all of the regulated power loads are forcibly stopped. It is possible to prevent the moving average current value from rising to the tripping current value of the circuit breaker for wiring, and to reliably prevent current interruption of the circuit breaker for wiring. The warning average current value is set to a value larger than the caution average current in consideration of the trip current value in the overcurrent operation characteristic, and the trip current value is, for example, about 90 to 97% (for example, 95%). Degree).

Further, according to the average current control system of claim 4 of the present invention, the regulated power load is divided into the first to third power load groups, and in this connection, the caution average current value is low. When the average current value and the high-attention average current value are set and the moving average current value calculated by the moving average current calculation means exceeds the low attention average current value, the first power load group in the regulated power load is forcibly activated. When stopped and when the moving average current exceeds the high attention average current value, the first and second power load groups in the regulated power load are forcibly deactivated, and the moving average current exceeds the warning average current value. And the first to third power load groups in the regulated power load are forcibly deactivated, so that the regulated power load is deactivated in stages as the moving average current value approaches the tripping current value of the circuit breaker for wiring. As a result, it is possible to prevent the current from being interrupted by the circuit breaker for wiring, while suppressing the effect of the operation stop of the regulated power load.

Further, according to the average current control system of the fifth aspect of the present invention, the first and second tripping current values are set based on the overcurrent operation characteristics of the wiring breaker, and the moving average current calculating means , The first and second moving average current values during the first and second overcurrent trip operating times set based on the first and second trip current values are calculated, and the average current comparing means calculates the first moving value. A second caution that is set based on the second moving average current value and the second tripping current value while comparing the average current value and the first caution average current value that is set based on the first tripping current value Since the regulated current load is controlled by comparing it with the average current value, it is possible to control the current interruption by the wiring breaker based on the two tripping current values.

For example, when the rated current of the wiring breaker is 30 A or less, for example, 30 A, the first tripping current value is, for example, 125% of the rated current value of 37.5 A, and the operating time for the 125% current is Is within 1 hour, and the second tripping current value is 60 A of the current of, for example, 200% of the rated current value, and the operating time for the 200% current is within 2 minutes, for example.

Further, according to the average current control system of claim 6 of the present invention, the first warning average that is larger than the first caution average current value based on the first tripping current value in the overcurrent operation characteristic of the wiring breaker. Since the current value is set and the second warning average current value that is larger than the second caution average current value is set based on the second trip current value in this overcurrent operation characteristic, the first and second trip current values are set. It is possible to prevent the moving average current value from rising up to the first and second tripping current values with respect to the two tripping current values, and to reliably prevent the breaking of the current of the wiring breaker.

1 is an overall view schematically showing an embodiment of an average current control system according to the present invention. The figure which shows the relationship between the rated current of a circuit breaker for wiring, a trip current value, and an overcurrent trip operation time. The block diagram which shows briefly the control system of the average current control system of FIG. 4 is a flowchart showing the flow of control by the control system of FIG. The flowchart which shows the flow of control by the control system of a 1st modification. The flowchart which shows the flow of control by the control system of a 2nd modification.

Hereinafter, an embodiment of an average current control system according to the present invention will be described with reference to the accompanying drawings. The average current control system may be installed in a switchboard when a small or medium-sized factory, a small or medium-sized store, or the like is newly installed, or may be retrofitted to these existing switchboards.

In FIG. 1, a low-voltage power supply line 2 from an electric power company is led to a switchboard 6 of a small factory, for example, through an electric power meter 4. The switchboard 6 is provided with a circuit breaker 8 for wiring (a so-called breaker for pulling in) and a distribution board 10, and the distribution board 10 has a plurality of (three in the illustrated example) distribution breakers (a so-called breaker). , A distribution breaker), that is, first to third distribution breakers 12a, 12b, 12c (so-called distribution breakers) are provided, and power is supplied from the distribution board 10 to a power load 14. A power supply line 15 for extending is provided.

In this embodiment, the power load 14 includes a normal power load 16 such as a lighting device (not shown) and a regulated power load 18 such as an air conditioner, and the regulated power load 18 includes, for example, four air conditioners, that is, a fourth air conditioner. 1st-4th air conditioner 18a, 18b, 18c, 18d is included. The first supply line 15a from the first distribution breaker 12a of the distribution board 10 is electrically connected to the normal power load 16, and the current flowing through the first distribution breaker 12a is supplied to the normal power load 16. To be done. In addition, the second supply line 15b from the second circuit breaker 12b for electrical distribution is electrically connected to the first and second air conditioners 18a and 18b of the regulated power load 18 (which constitutes the first power load group 20). , The current flowing through the second circuit breaker 12b for power distribution is supplied to the first and second air conditioners 18a, 18b, and the third supply line 15c from the circuit breaker 12c for third power distribution is connected to the first Electric currents that are electrically connected to the third and fourth air conditioners 18c and 18d and that flow through the third power distribution breaker 12c are supplied to the third and fourth air conditioners 18a and 18b (constituting the second power load group 22). Supplied.

The distribution board 6 is further configured as follows. Referring to FIG. 3 together with FIG. 1, the power is supplied to a power supply line 24 connecting the circuit breaker 8 of the switchboard 6 and the distribution board 10 (first to third distribution breakers 12a to 12c). A current measuring unit 26 for measuring the current flowing through the load 14 is provided. In this embodiment, the current measuring means 24 is composed of a pair of current transformers (so-called CT), that is, first and second current transformers 28a and 28b, and one of the first current transformers 28a is a power supply line. The second current transformer 28b is disposed on one of the feeding lines 24a of 24 and the other second current transformer 28b is disposed on the other feeding line 24b of the power feeding line 24.

The average current control system 30 for controlling the operation of the regulated electric power load 18 (first to fourth air conditioners 18a to 18d) using the current measured by the current measuring means 26 includes a controller device 32 in addition to the current measuring means 26. A load control unit 34 for controlling the regulated power load 18 is included, in this form the controller device 32 and the load control unit 34 are made up of separate units, but should be made as an integrated unit. In this case, for example, the load control unit 34 can be incorporated in the controller device 32.

The wiring breaker 8 for preventing the overcurrent from flowing is generally configured to perform the current interruption, for example, in the following manner by utilizing the characteristic of the overcurrent operation characteristic. In FIG. 2, the relationship between the overcurrent trip current value of the wiring breaker 8 and the overcurrent trip operation time is set as shown in FIG. 2, for example. For example, when the rated current of the circuit breaker 8 for wiring is 30 A or less (or 30 to 50 A or less, 50 to 100 A or less, 100 to 225 A or less), 125% or more of the rated current is when the overcurrent is small. The overcurrent tripping current value becomes, and the overcurrent tripping operation time corresponding to this overcurrent tripping current value becomes 60 minutes (or 60 minutes, 120 minutes, 120 minutes), and the rated current of 200 % Current value becomes the overcurrent trip current value when the overcurrent is large, and the overcurrent trip operation time corresponding to this overcurrent trip current value is 2 minutes (or 4 minutes, 6 minutes). , 8 minutes).

For example, when the rated current of the circuit breaker 8 for wiring is 50 A, the overcurrent trip current value when the overcurrent is small is 62.5 A, and when the overcurrent is large, the overcurrent trip current value is 100 A. Therefore, the circuit breaker for wiring 8 cuts off the current when the overcurrent trip current value 62.5A flows within the overcurrent trip operation time of 60 minutes, and the overcurrent trip current value 100A exceeds the overcurrent trip current value. When the tripping operation time is less than 4 minutes, the current is cut off, and the current is cut off in this way to prevent an accident from an overcurrent.

Next, the control system of the average current control system 30 will be described. The controller 32 includes a moving average current calculating means 42, an average current comparing means 44, a partial stop signal generating means 46 and an all stop signal generating means 48. There is. The measured current from the current measuring means 26 (first and second current transformers 28a and 28b) is sent to the controller 32, and the moving average current calculating means 42 calculates the measured current from the current measuring means 26 to be described later. Of the moving average current (first moving average current D1 and second moving average current D2) are calculated, and the average current comparing means 44 moves the moving average current value D (first moving average current value D1 and second moving average current D1) as described later. 2 moving average current value D2), attention average current value T (first attention average current value V1 and second attention average current value T2), and warning average current value K (first warning average current value K1 and second warning average current) Compare with value K2). Further, the partial stop signal generating means 46 generates a partial stop signal as described later, and the total stop signal generating means 48 generates an all stop signal as described later.

The controller 32 further includes timing means 50 and memory means 52. The time measuring means 50 measures a period, for example, a time when calculating a moving average current. Further, the memory means 52 has a caution average current value T (first value) used when the average current comparison means 44 compares the moving average current value D (first moving average current value D1 and second moving average current value D2). The caution average current value T1 and the second caution average current value T2) and the warning average current value K (the first warning average current value K1 and the second warning average current value K2) are registered.

Here, the caution average current value T and the warning average current value K will be described. The caution average current value T (first and second caution average current values T1 and T2) is, for example, 70 based on the overcurrent trip current value. The value is set to about 80%, for example, about 75%, and when this overcurrent trip current value is, for example, 62.5 A (100 A), for example, the first attention average current value T1 (second attention average current value T2) is set to about 48A (75A).

Further, the warning average current value K (first and second warning average current values K1, K2) is set to a value of, for example, about 90 to 97%, for example, a value of about 95% based on the overcurrent tripping current value. When the overcurrent trip current value is, for example, 62.5 A (100 A), the first warning average current value K1 (second warning average current value K2) is set to about 58 A (95 A).

The caution average current value T and the warning average current value K are compared with the first caution average current value T1 and the first warning average current value K1 with respect to the first moving average current value D1 as described later in detail. The second moving current average value D2 is compared with the second caution average current value T2 and the second warning average current value K2. In this connection, the moving average of the first moving average current value D1 is equal to the overcurrent trip operating time (in this case, 60 minutes) corresponding to the overcurrent trip current value when the overcurrent is small. The second moving average current value D2 is the average current value during the moving time, and the second moving average current value D2 is the overcurrent tripping operation time (4 minutes in this case) corresponding to the overcurrent tripping current value when the overcurrent is large. It is the average current value during the moving time.

The load control unit 34 also includes operation control means 54 for controlling the operation of the regulated power load 18, and in this embodiment, when the partial stop signal generation means 46 generates a partial stop signal, this one A partial stop signal is sent from the controller 32 to the load control unit 34, and the operation control means 54 is based on this partial stop signal, the first electric power load group 20 of the regulated electric power loads 18, that is, the first and second air conditioners 18a. , 18b is forcibly deactivated. Further, when the all stop signal generating means 48 generates the all stop signal, this all stop signal is sent from the controller 32 to the load control unit 34, and the operation control means 54 of the regulated power load 18 is based on this all stop signal. The first and second power load groups 20 and 22, that is, all of the first to fourth air conditioners 18a to 18d are forcibly stopped.

Next, with reference to FIG. 4 together with FIGS. 1 and 3, a flow of control of the regulated power load 18 by the above-described average current control system 30 will be described. Mainly referring to FIG. 4, when controlling the regulated power load 18, first, the current flowing through the power supply line 24 (first and second supply lines 24a, 24b) is measured (step S1). That is, the current measuring means 26 (first and second current transformers 28a, 28b) measures the current flowing through the power supply line 24, and the measured current signal from the current measuring means 26 is sent to the controller 32.

When the measured current signal is sent in this way, the process proceeds to step 2, and the moving average current calculation means 42 corresponds to the trip current value of the overcurrent when the overcurrent is small based on the measured current signal. The moving average current (moving average current value for 60 minutes) during the current trip operation time (for example, 60 minutes), that is, the first moving average current D1 is calculated, and the process proceeds to step S3. , A moving average current (4 minutes moving average current value) at an overcurrent trip operating time (for example, 4 minutes) corresponding to the overcurrent trip current value when the overcurrent is large based on the measured current signal That is, the second moving average current D2 is calculated.

When the first moving average current D1 is calculated in step S2, steps S4 and thereafter are executed as follows. That is, the average current comparison means 44 compares the first moving average current value D1 calculated by the moving average current calculation means 42 with the first attention average current value T1 (step S4), and the first moving average current value D1. Exceeds the first caution average current value T1, the process proceeds from step S5 to step S6, and then the average current comparing means 44 compares the first moving average current value D1 with the first warning average current value K1. When the first moving average current value D1 is less than or equal to the first attention average current value T1, it is determined that an overcurrent for cutting off the current does not flow, and the process returns from step S5 to step S1.

If the first moving average current value D1 is less than or equal to the first warning average current value K1 (that is, the first caution average current value T1<first moving average current value D1≦first warning average current value K1), step S7. Then, the process proceeds to step S8, and the partial stop signal generation means 46 generates a partial stop signal based on the comparison result. Thus, this partial stop signal is sent from the controller 32 to the load control unit 34, and the operation control means 54 is based on this partial stop signal, a part of the regulated electric power load, in this embodiment the first electric power load group 20. (First and second air conditioners 18a, 18b) are forcibly stopped (step S9). When such a small overcurrent continues for a time close to the overcurrent tripping operation time (for example, 60 minutes), the first power load group 20 is deactivated, whereby the overcurrent flowing through the wiring breaker 8 is reduced. It is possible to prevent the current from being interrupted by the circuit breaker 8 for wiring due to the suppression of the flow of a small overcurrent.

When the first moving average current value D1 exceeds the first warning average current value K1 (that is, the first warning average current value K1<the first moving average current value D1), the process proceeds from step S7 to step S10. Based on the comparison result that the first warning average current value K1 is exceeded, the all stop signal generation means 48 generates all stop signals. Thus, the all-stop signal is sent from the controller 32 to the load control unit 34, and the operation control means 54 is based on the all-stop signal based on the all-stop signal to adjust all of the regulated power loads 18, in this embodiment the first and second power load groups. 20, 22 (first to fourth air conditioners 18a to 18d) are forcibly stopped (step S11). When such a small overcurrent lasts very close to the overcurrent trip time (eg, 60 minutes), both the first and second power load groups 20, 22 are deactivated, which causes the wiring The overcurrent flowing through the circuit breaker 8 can be greatly suppressed, and the current interruption by the wiring circuit breaker 8 due to the small overcurrent flowing can be reliably prevented.

When the second moving average current D2 is calculated in step S3, step S12 and subsequent steps are executed as follows. That is, the average current comparison means 44 compares the second moving average current value D2 calculated by the moving average current calculation means 42 with the second attention average current value T2 (step S12), and the second moving average current value D2. Exceeds the second caution average current value T2, the process proceeds from step S13 to step S14, and the average current comparing means 44 then proceeds to the second moving average current value D2 and the second warning average current in the same manner as described above. The value K2 is compared. When the second moving average current value D2 is equal to or less than the second attention average current value T2, it is determined that the overcurrent enough to interrupt the current does not flow, and the process returns from step S13 to step S1.

If this second moving average current value D2 is less than or equal to the second warning average current value K2 (that is, the second caution average current value T2<second moving average current value D2≦second warning average current value K2), step S15. Then, the process proceeds to step S16, and according to the comparison result, the partial stop signal generating means 46 generates a partial stop signal based on a large overcurrent at this time. Then, this partial stop signal is sent to the load control unit 34 in the same manner as described above, and the operation control means 54 is based on the partial stop signal, a part of the regulated power load 18, that is, the first power load group 20. Is forcibly stopped (step S17). When such a large overcurrent continues for a time close to the overcurrent tripping operation time (for example, 4 minutes), the first power load group 20 is deactivated, whereby the overcurrent flowing through the wiring breaker 8 is reduced. It is possible to prevent the current from being interrupted by the circuit breaker 8 for wiring due to the suppression of a large overcurrent.

When the second moving average current value D2 exceeds the second warning average current value K2 (that is, the second warning average current value K2<the second moving average current value D2), the process proceeds from step S15 to step S18. Based on the comparison result, the all stop signal generation means 48 generates the all stop signal. Thus, this all-stop signal is sent to the load control unit 34, and the operation control means 54 forces both the first and second power load groups 20, 22 of the regulated power load 18 based on the all-stop signal. The operation is stopped (step S19). When such a large overcurrent lasts very close to the overcurrent trip time (eg, 4 minutes), both the first and second power load groups 20, 22 are deactivated, which causes the wiring to The overcurrent flowing through the circuit breaker 8 can be greatly suppressed, and the current interruption by the wiring breaker 8 due to the large overcurrent flowing can be reliably prevented.

In the above-mentioned embodiment, the overcurrent operation characteristic of the circuit breaker 8 for wiring is used to apply the current interruption caused by a small overcurrent and the current interruption caused by a large overcurrent. The same can be applied to the current interruption due to the flow of three or more different overcurrents. For example, when applied to the current interruption by the circuit breaker 8 for wiring due to the flow of three overcurrents having different magnitudes, the following is obtained.

In this case, the first to third caution average current values T1 to T3 are registered as the caution average current value T in the memory means 52 of the controller 32, and the first to third warning average current values D1 to D3 are registered as the warning average current value. D3 is registered. The first caution average current value T1 and the first warning average current value D1 are the first tripping current value based on the overcurrent operation characteristic of the wiring breaker (for example, a current value of 125% of the rated current of the wiring breaker 8). ) In the same manner as described above, and the second caution average current value T2 and the second warning average current value K2 are the second tripping current value (wiring circuit breaker 8) based on this overcurrent operation characteristic. Is set in the same manner as described above on the basis of the rated current value of 150% of the rated current value), and the third caution average current value T3 and the third warning average current value K3 are set based on this overcurrent operation characteristic. It is set in the same manner as described above based on the tripping current value (for example, a current value of 200% of the rated current value of the circuit breaker 8 for wiring).

In connection with this, the moving average current calculating means 42 is configured to set the first to third overcurrent trip operating times set based on the first to third trip current values to the first to third moving average currents. The values D1 to D3 are calculated, and the average current comparing means 44 compares the first to third moving average current values D1 to D3 with the above-mentioned first to third attention average current values T1 to T3, and The first to third moving average current values D1 to D3 are compared with the above-mentioned first to third warning caution average current values.

Then, the first moving average current value D1 (or the second moving average current value D2, the third moving average current value D3) is the first attention average current value T1 (or the second attention average current value T2, the third attention average current). When the value T3) is exceeded, the partial stop signal generation means 46 generates a partial stop signal generation signal, and based on the partial stop signal, the first power load group 20 (first and second power load groups 20 of the regulated power load 18 is generated. 2 air conditioners 18a, 18b) are forcibly deactivated, and the first moving average current value D1 (or the second moving average current value D2, the third moving average current value D3) is the first warning average current value K1 ( Alternatively, when the second warning average current value K2 and the third warning average current value K3) are exceeded, the all-stop signal generating means 48 generates an all-stop signal, and based on the all-stop signal, the first of the regulated power loads 18 is generated. Also, the second power load groups 20, 22 (first to fourth air conditioners 18a to 18d) are forcibly deactivated.

The flow of control by the average current control system of the first modification is as shown in FIG. Referring to FIG. 5, when controlling the regulated power load 18 (first and second power load groups 20, 22), first, the current flowing through the power supply line 24 is measured (step S21), and the current is measured. The measured current signal from the measuring means 26 is sent to the controller 32.

When thus fed, the moving average current calculation means 42 corresponds to the trip current value of the first overcurrent (current value of 125% of the rated current, for example) when the overcurrent is small based on the measured current signal. The moving average current during the trip operation time of the overcurrent, that is, the first moving average current D1 is calculated (step S22), and the trip current value of the second overcurrent when the overcurrent is medium (the rated current For example, the moving average current during the trip operation time of the overcurrent corresponding to the current value of 150%), that is, the second moving average current D2 is calculated (step S23), and the third overcurrent is pulled when the overcurrent is large. The moving average current during the trip time of the overcurrent corresponding to the removal current value (for example, the current value of the rated current of 200%), that is, the third moving average current D3 is calculated (step S24).

When the first moving average current D1 is calculated in step S22, steps S25 to S28 are executed using the first moving average current value D1, and the second moving average current D2 is calculated in step S23. When calculated, steps S29 to S32 are executed using this second moving average current value D2, and when the third moving average current D3 is calculated in step S24, this third moving average current value D3. Are used to execute steps S33 to S36, and the operation contents of steps S25 to S28, steps S29 to S32, and steps S33 to S36 are substantially the same as described later.

When the first moving average current D1 (second moving average current D2, third moving average current D3) is calculated, the process proceeds from step S22 (step S23, step S24) to step S25 (step S29, step S33), and the average. The current comparison means 44 includes a first moving average current value D1 (second moving average current value D2, third moving average current value D3) and a first attention average current value T1 (second attention average current value, third attention average). Current value T3), the first moving average current value D1 (second moving average current value D2, third moving average current value D3) is compared with the first attention average current value T1 (second attention average current value T2, When the third attention average current value T3) is exceeded, the process proceeds from step S26 (step S30, step S34) to step S27 (step S31, step S35), and then the average current comparison means 44 uses the first moving average current value. D1 (second moving average current value D2, third moving average current value D3) and first warning average current value K1 (second warning average current value K2, third warning average current value K3) are compared, and then step In S28 (steps S32 and S36), control based on the comparison result is performed, and the control content is substantially the same as steps S7 to S11 (steps S15 to S19) in the flowchart of FIG.

The first moving average current value D1 (second moving average current value D2, third moving average current value D3) is the first warning average current value K1 (second warning average current value K2, third warning average current value K3). When the following is true, the partial stop signal generation means 46 generates a partial stop signal, and the operation control means 54 uses the partial stop signal based on the partial stop signal, as described above. (First and second air conditioners 18a, 18b) are forcibly stopped. The first moving average current value D1 (second moving average current value D2, third moving average current value D3) exceeds the first warning average current value K1 (second warning average current value K2, third warning average). Occasionally, as described above, the all-stop signal generating means 48 generates the all-stop signal, and the operation control means 54 determines the first and second power load groups 20, 22 of the regulated power load 18 based on the all-stop signal. Forcefully deactivate both.

In the above-described embodiment, the attention average current value T (the first attention average current value T1, the second attention average current value) is used for the current interruption due to the overcurrent flowing using the overcurrent operation characteristic of the wiring breaker 8. T2) and warning average current value K (first warning average current value K1 and second warning average current value K2) are set and controlled, but this caution average current value T is set to a low caution average current with a small current value. A value T01 (for example, a current value of, for example, about 65 to 75%, for example, about 70% of the trip current value in the overcurrent operation characteristic) (first low caution average current value T011, second low caution average current value T021) , A high caution average current value T01 larger than this low caution average current value (for example, a current value of, for example, about 75 to 85%, for example, about 80% of the trip current value in the overcurrent operation characteristic) (first high caution average It is also possible to set the current value T012 and the second high attention average current value T022) and control the attention average current value T01 in two steps, so that the attention average current value T is controlled in three or more steps. You can also do it.

In such a case, the regulated power load 18 is divided into three power load groups, that is, the first to third power load groups, and the overcurrent trip corresponding to the trip current value in the overcurrent operation characteristic of the wiring breaker 8 is drawn. With respect to the moving average current value D during the removal operation time, the operation control means 54 comes to control the operation of the first to third power load groups of the adjusted power load 18 as follows. When the moving average current value D exceeds the low attention average current value T01 (T01<D≦T02), the partial stop signal generation means 46 generates a first partial stop signal, and the first partial stop is generated. When the first power load group of the regulated power load 18 is forcibly deactivated by the signal and the moving average current value D exceeds the high caution average current value T02 (T02<D≦K), a part of the signal generating means is generated. 46 generates a second partial stop signal, which forces the first and second power load groups of the regulated power load 18 to be deactivated. Further, when the moving average current value D exceeds the warning average current value K (K<D), the all signal generation means 48 generates an all stop signal, and the all stop signal causes the first to the first of the regulated power loads 18 to be generated. All three power load groups are forced down.

The flow of control by the average current control system according to the second modification is as shown in FIG. With reference to FIG. 6, when controlling the regulated power load 18 (first to third power load groups), first, the current flowing through the power supply line 24 is measured (step S41), and the current measuring means 26. Is sent to the controller 32, and the moving average current calculating means 42 trips the overcurrent of the wiring breaker 8 based on the measured current signal. The moving average current in time is calculated (step S42), and the following control is performed using this moving average current value D.

The average current comparison means 44 first compares the moving average current value D and the low attention average current value T01 (step S43), and when the moving average current value D exceeds the low attention average current value T01, the steps from step S44 to step S44. Next, in S45, the average current comparison means 44 compares the moving average current value D with the high-attention average current value T02.

Then, when the moving average current value D is equal to or less than the high-attention average current value T02 (T01<D≦T02), the process proceeds from step S46 to step S47, and the partial stop signal generation means 46 causes the first partial stop signal. Is generated (step S47), and the first power load group of the regulated power load 18 is forcibly deactivated by this first partial stop signal (step S48).

When the moving average current value D exceeds the high-attention average current value T02 (T02<D), the process proceeds from step S46 to step S49, and the average current comparing unit 44 causes the moving average current value D and the warning average current value K to be obtained. If the moving average current value D is less than or equal to the warning average current value K (T02<D≦K), the process proceeds from step S50 to step S51, and the partial signal generation means 46 stops the second partial stop. A signal is generated, and the first and second power load groups of the regulated power load 18 are forcibly deactivated by the second partial stop signal (step S52).

When the moving average current value D exceeds the warning average current value K (K<D), the process proceeds from step S50 to step S53, the all signal generation means 48 generates all stop signals, and the all stop signals are used for adjustment. All of the first to third power load groups of the power load 18 are forcibly deactivated (step S54).

Although one embodiment of the average current control system according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. ..

6 Switchboard 8 Wiring Circuit Breaker 10 Distribution Board 14 Power Load 16 Normal Power Load 20 First Power Load Group 22 Second Power Load Group 26 Current Measuring Means 30 Average Current Control System 32 Controller 34 Load Control Unit 42 Moving Current Computing Means 44 Average Current Comparing Means 46 Partial Stop Signal Generating Means 48 All Stop Signal Generating Means 54 Operation Control Means

According to the average current control system of claim 1 of the present invention, the moving average current calculating means calculates the moving average current value, and the average current comparing means calculates the moving average current value and the overcurrent operation of the circuit breaker for wiring. When the moving average current value exceeds the caution average current value, which is set based on the tripping current value in the characteristic, and the moving average current value exceeds the caution average current value, the partial stop signal generation means generates the partial stop signal generation signal. To do. Therefore, when the moving average current value approaches the tripping current value of the circuit breaker for wiring, a partial stop signal is generated, and based on this partial stop signal, part of the regulated power load is forcibly stopped. It is possible to prevent the moving average current value from further approaching the tripping current value of the wiring breaker, and prevent current interruption of the wiring breaker.
In other words, the moving average current value is calculated by the moving average current calculating means based on the load measurement current value measured by the current measuring means, and the peak current value at the time of start-up of the adjusted power load such as the air conditioner is calculated as the adjusted power load. The leveling of the circuit breaker for wiring is made possible by controlling the operation of the power supply, and the level of the circuit breaker for wiring can be selected to be the minimum required. It is possible to reduce the total electricity bill by lowering .

Claims (6)

A circuit breaker for wiring for preventing an overcurrent from flowing in the power load, a current measuring unit for measuring the current flowing in the power load, and a moving average current based on the measured current measured by the current measuring unit. A moving average current calculating means for calculating a value, and a caution average current set based on the moving average current value calculated by the moving average current calculating means and the trip current value in the overcurrent operation characteristic of the wiring breaker. An average current comparing means for comparing the value with a value, and a partial stop signal generating means for stopping the operation of a part of the adjustable power load of the power load that is adjustable in operation,
When the moving average current value exceeds the caution average current value, the partial stop signal generation means generates the partial stop signal, and based on the partial stop signal, a part of the adjusted power load is forced. An average current control system characterized by being deactivated. 2. The moving average current calculating means calculates the moving average current value during an overcurrent trip operation time corresponding to the trip current value in the overcurrent operation characteristic of the wiring breaker. Average current control system according to. A warning average current value larger than the caution average current value is set based on the tripping current value in the overcurrent operation characteristic of the circuit breaker for wiring, and in relation to the warning average current value, all of the adjustment power loads are set. An all stop signal generating means for generating an all stop signal for stopping the operation is provided, and the average current comparing means is provided with the moving average current value and the warning average current value calculated by the moving average current calculating means. When the moving average current value exceeds the warning average current value, the all-stop signal generation means generates the all-stop signal, and based on the all-stop signal, all of the adjusted power loads are The average current control system according to claim 1, wherein the average current control system is forcibly deactivated. The regulated power loads are divided into first to third power load groups, and in this connection, the attention average current value is higher than the low attention average current value and the low attention average current value. A current value is set, and the partial stop signal generation means generates a first partial stop signal corresponding to the low attention average current value and a second partial stop signal corresponding to the high attention average current value. Then, the average current comparing means compares the moving average current value calculated by the moving average current calculating means with the low attention average current value, the high attention average current value, and the warning average current value, and moves the moving average current value. When the average current value exceeds the low caution average current value, the partial stop signal generation means generates the first partial stop signal, and based on the first partial stop signal, the adjusted power load. And the moving average current exceeds the high attention average current value, the partial stop signal generating means generates the second partial stop signal. When the first and second power load groups in the regulated power load are forcibly deactivated based on the second partial stop signal, and the moving average current exceeds the warning average current value, The all-stop signal generating means generates the all-stop signal, and the first to third power load groups in the regulated power load are forcibly deactivated based on the all-stop signal. The average current control system according to claim 3. First and second tripping current values are set based on the overcurrent operating characteristics of the circuit breaker, and the moving average current calculating means is set based on the first and second tripping current values. Calculating the first and second moving average current values during the first and second overcurrent trip operation times, and the average current comparing means is based on the first moving average current value and the first trip current value. And comparing the first moving average current value set according to the second moving average current value with the second moving average current value set based on the second tripping current value. When one moving average current value exceeds the first attention average current value, or when the second moving average current value exceeds the second attention average current value, the partial stop signal generation means outputs the partial stop signal. The average current control system according to claim 1, wherein a part of the regulated power load is forcibly deactivated based on the generated and partially stopped signal. A first warning average current value that is larger than the first caution average current value is set based on the first trip current value in the overcurrent operation characteristic of the wiring breaker, and the second trip current value is set. A second warning average current value that is greater than the second caution average current value is set based on the above, and a stop all signal that shuts down all of the adjusted power loads in relation to the first and second warning average current values. All-stop-signal generating means for generating, and the average current comparing means, the first and second moving average current values calculated by the moving average current calculating means, and the first and second moving average current values. If the first moving average current value exceeds the first warning average current value, or if the second moving average current value exceeds the second warning average current value, the whole is stopped. 6. The average current control system according to claim 5, wherein the signal generating means generates the all-stop signal, and based on the all-stop signal, all of the regulated power loads are forcibly deactivated.

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