Measurement device, measurement method, and program

Abstract

To continue measurement of integral power consumption even when supply of power is stopped.SOLUTION: A measurement device comprises: a measurement unit that measures the amount of power supplied from a predetermined power supply; a volatile first storage unit; a non-volatile second storage unit; and a control unit that sequentially stores integral power consumption obtained by integrating the amounts of power measured by the measurement unit in the first storage unit, and stores the integral power consumption stored in the first storage unit in the second storage unit at a predetermined interval.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a measurement device, a measurement method, and a program. [Background technology]

[0002] Conventionally, the amount of power supplied from a power source to a load is measured by a measuring device, and the accumulated amount of power since the start of power supply is transmitted to a server at regular intervals. The server calculates the electricity usage fee from the received accumulated amount of power. Patent Document 1 discloses a power monitoring device that displays the accumulated amount of power. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-264369 Summary of the Invention [Problem to be solved by the invention]

[0004] The integrated amount of power being measured is typically stored in a volatile memory. If the supply of power to the volatile memory is stopped, the stored integrated amount of power is lost. For this reason, measuring devices are typically equipped with a battery so that they can continue measuring the amount of power even if the power supply from the power source is stopped due to a power outage or other reason. However, some measuring devices do not have a battery, which reduces the cost of the measuring device. With such measuring devices that do not have a battery, if the power supply from the power source is stopped, the integrated amount of power being measured is lost, making it difficult to continue measuring the integrated amount of power. The power usage fee for the lost integrated amount of power is borne by the equipment installer.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a technology that makes it possible to continue measuring the accumulated amount of power even when the power supply is stopped. [Means for solving the problem]

[0006] A measuring device according to one aspect of the present invention includes a measuring unit that measures the amount of power supplied from a predetermined power source, a volatile first storage unit, a nonvolatile second storage unit, and a control unit that sequentially stores an integrated amount of power obtained by integrating the amounts of power measured by the measuring unit in the first storage unit and stores the integrated amount of power stored in the first storage unit in the second storage unit at predetermined intervals. When the supply of power from the predetermined power source is stopped, the integrated amount of power stored in the volatile first storage unit is lost, but the integrated amount of power stored in the nonvolatile second storage unit is not lost. By storing the integrated amount of power stored in the first storage unit in the second storage unit at predetermined intervals, it is possible to continue measuring the integrated amount of power even when the supply of power from the predetermined power source is stopped.

[0007] When the supply of power from the predetermined power source is started after the supply of power from the predetermined power source is stopped, the control unit stores the integrated amount of power stored in the second storage unit in the first storage unit. By writing the integrated amount of power stored in the second storage unit to the first storage unit, it is possible to restore the integrated amount of power stored in the first storage unit.

[0008] The second storage unit stores a plurality of the integrated amounts of power, and when the supply of power from the predetermined power source is stopped, the control unit calculates an estimated integrated amount of power at the time of the stop based on the plurality of integrated amounts of power stored in the second storage unit and the time of the stop of the supply of power from the predetermined power source, and the control unit calculates an estimated integrated amount of power at the time of the stop of the supply of power from the predetermined power source. When the estimated integrated amount of power is exceeded, the estimated integrated amount of power is stored in the first storage unit. By writing the estimated integrated amount of power to the first storage unit, it is possible to restore the integrated amount of power stored in the first storage unit.

[0009] The predetermined interval is set based on parameters related to rewriting of the second storage unit. This makes it possible to set the predetermined interval appropriately. The parameters include a guaranteed number of rewrites and a guaranteed number of years. The guaranteed number of rewrites is, for example, the number of times data can be rewritten normally. The guaranteed number of years is, for example, the number of years for which the performance of the second storage unit is guaranteed. The above measuring device does not have a battery. It is possible to continue measuring the integrated power amount in a measuring device that does not have a battery.

[0010] The present invention can be understood as a measurement method including at least a part of the above-described processing, a program for causing a computer to execute at least a part of the above-described processing, or a computer-readable recording medium on which such a program is non-temporarily recorded. It can also be understood as a measurement system including at least a part of the above-described processing. The above configurations and processing can be combined to constitute the present invention as long as no technical contradictions arise. [Effects of the Invention]

[0011] According to the present invention, even if the supply of power is stopped, it is possible to continue measuring the integrated amount of power. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing the configuration of a measurement system. [Figure 2] FIG. 2 is a diagram illustrating the operation of the measuring device under normal conditions. [Figure 3] FIG. 3 is a diagram illustrating the operation of the measuring device when an abnormality occurs. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments will be described with reference to the drawings. The embodiment described below is one aspect of the present application and does not limit the scope of the present application.

[0014] FIG. 1 is a diagram showing the configuration of a measurement system. The measurement system includes a measurement device (power measurement device) 1 and a management server 2. The measurement device 1 includes a connection unit 11, a control unit 12, a measurement unit 13, a first memory unit 14, a second memory unit 15, and a communication unit 16. The connection unit 11 includes at least a plug 21 to be inserted into a socket provided in a structure such as a wall or building, a socket 22 into which the plug of a load 3 such as an electrical device can be inserted, and a relay 23. The measurement device 1 can be electrically connected to a commercial power source (electric power system) 4 via the socket in the structure. The commercial power source 4 is an example of a predetermined power source. The management server 2 may be, for example, an information processing device having a communication function.

[0015] The measuring device 1 does not include a battery (storage battery), and power for driving the measuring device 1 is supplied from the commercial power source 4. Therefore, the measuring device 1 is driven by power supplied from the commercial power source 4. The measuring device 1 also operates to start (permit) or stop (block) the supply of power from the commercial power source 4 to the load 3. The relay 23 is a switch component that can switch between a conductive state and a non-conductive state. The operation of the relay 23 is controlled by the control unit 12. When the relay 23 switches from a non-conductive state to a conductive state, i.e., when the relay 23 is in the ON state (conductive state), power supplied from the commercial power source 4 is supplied to the load 3 via the relay 23. When the relay 23 switches from a conductive state to a non-conductive state, i.e., when the relay 23 is in the OFF state (non-conductive state), the power supply from the commercial power source 4 is blocked, and the power supply to the load 3 is terminated.

[0016] The control unit 12 is a controller that controls each part of the measuring device 1, processes signals, performs calculations, etc. The control unit 12 may be configured by a computer having, for example, a processor, a storage device such as a memory, an I / O, etc. The processor is, for example, a CPU (Central Processing Unit). The storage device is, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, etc. For example, the control unit 12 may be configured by a computer having, for example, a processor, a storage device such as a memory, an I / O, etc. The control unit 12 executes each process by expanding the program and executing the program. The measurement unit 13 measures the amount of power supplied from the commercial power supply 4. Specifically, the measurement unit 13 measures the instantaneous amount of power supplied from the commercial power supply 4. The measurement unit 13 measures the instantaneous amount of power at a first predetermined interval. The first predetermined interval is, for example, one minute, but is not limited to this. The control unit 12 integrates the instantaneous amount of power measured by the measurement unit 13 to calculate the integrated amount of power, and stores the integrated amount of power (power amount data) in the first storage unit 14. Because the measurement unit 13 measures the instantaneous amount of power at the first predetermined interval, the control unit 12 updates the integrated amount of power in the first storage unit 14 by adding the instantaneous amount of power to the integrated amount of power stored in the first storage unit 14 every time the measurement unit 13 measures the instantaneous amount of power.

[0017] The first storage unit 14 is a volatile memory (volatile storage device), such as a RAM. When the supply of power from the commercial power source 4 to the measuring device 1 is stopped, the integrated power amount stored in the first storage unit 14 is lost. The control unit 12 stores the integrated power amount stored in the first storage unit 14 in the second storage unit 15 at a predetermined timing. The control unit 12 may store the integrated power amount stored in the first storage unit 14 in the second storage unit 15 at a second predetermined interval. The second predetermined interval is longer than the first predetermined interval. The second predetermined interval is an example of a predetermined interval. The second predetermined interval is, for example, 5 minutes, but is not limited to this. The second storage unit 15 is a non-volatile memory (non-volatile storage device), such as a flash memory. Even when the supply of power from the commercial power source 4 to the measuring device 1 is stopped, the integrated power amount (retained integrated power amount) stored in the second storage unit 15 is not lost.

[0018] The communication unit 16 is an interface for communicating with external devices such as the management server 2. The communication unit 16 communicates with the management server 2 wirelessly or via a wired connection. The control unit 12 receives a relay ON instruction or a relay OFF instruction from the management server 2 via the communication unit 16. The relay ON instruction is an instruction (operation signal) for switching the relay 23 to a conductive state. The relay OFF instruction is an instruction (stop signal) for switching the relay 23 to a non-conductive state. The control unit 12 switches the relay 23 from an OFF state to an ON state based on the relay ON instruction. The control unit 12 switches the relay 23 from an ON state to an OFF state based on the relay OFF instruction. The control unit 12 may send the integrated energy of power stored in the first storage unit 14 to the management server 2 via the communication unit 16 at a predetermined timing. The control unit 12 may send the integrated energy of power stored in the second storage unit 15 to the management server 2 via the communication unit 16 at a predetermined timing. The management server 2 may calculate the electricity usage fee based on the received integrated amount of electricity.

[0019] 1 are not all essential components of the measuring device 1, and components may be added or removed as appropriate. For example, the measuring device 1 may include a display device such as a display that displays the measured cumulative power consumption, or an input device such as a touch panel that accepts input operations. The display device and the input device may be configured as an integrated unit, or may be configured separately.

[0020] Fig. 2 is an explanatory diagram of the operation of the measuring device 1 under normal conditions. The power [W] shown in Fig. 2 is the instantaneous power measured by the measuring unit 13. The integrated power amount [kWh] shown in Fig. 2 is the integrated power amount accumulated by the control unit 12 and is the integrated power amount held in the first memory unit 14. The retained integrated power amount [kWh] shown in Fig. 2 is the integrated power amount held in the second memory unit 15.

[0021] At time T1, the control unit 12 receives a relay ON instruction. At time T2, the control unit 12 switches the relay 23 to the ON state. The relay ON count shown in FIG. 2 is the number of times the relay 23 has transitioned to the ON state. As shown in FIG. 2, the power [W] increases to a constant value, and the integrated energy [kWh] increases continuously. The control unit 12 stores the integrated energy [kWh] in the second memory unit 15 at second predetermined intervals, so the retained integrated energy [kWh] increases stepwise. In FIG. 2, the interval D1 corresponds to the second predetermined interval.

[0022] At time T3, the control unit 12 receives a relay OFF command and switches the relay 23 to the OFF state. Because the relay 23 is in the OFF state, the power [W] becomes 0 [W] and the integrated energy [kWh] stops increasing. Because the integrated energy [kWh] does not increase, there is no change in the retained integrated energy [kWh] stored in the second memory unit 15. At time T4, the control unit 12 receives a relay ON command. At time T5, the control unit 12 switches the relay 23 to the ON state. As shown in FIG. 2, the power [W] increases to a constant value and the integrated energy [kWh] increases continuously. Because the control unit 12 stores the integrated energy [kWh] in the second memory unit 15 at second predetermined intervals, the retained integrated energy [kWh] increases stepwise.

[0023] At time T6, control unit 12 receives a relay OFF command and switches relay 23 to the OFF state. Because relay 23 is in the OFF state, the power [W] becomes 0 [W] and the integrated energy [kWh] stops increasing. Because the integrated energy [kWh] does not increase, there is no change in the retained integrated energy [kWh] retained in second storage unit 15.

[0024] A1 to A11 shown in FIG. 2 are timings (storage timings) at which the control unit 12 writes the integrated energy [kWh] to the second storage unit 15. When the relay 23 is in the ON state, the control unit 12 writes the integrated energy [kWh] to the second storage unit 15 at a second predetermined interval. When the control unit 12 receives a relay OFF instruction or when the control unit 12 switches the relay 23 to the OFF state, the control unit 12 writes the integrated energy [kWh] to the second storage unit 15. For example, since there is a limit (upper limit) on the number of times that nonvolatile memory can be rewritten, it is preferable to reduce the number of times that nonvolatile memory is written. The control unit 12 stores the integrated energy [kWh] in the second storage unit 15 at predetermined timings, so that the number of times that nonvolatile memory is written to the second storage unit 15 can be reduced.

[0025] 3 is a diagram illustrating the operation of the measuring device 1 in an abnormal state. Here, the operation of the measuring device 1 when the supply of power from the commercial power source 4 is stopped while the relay 23 is in the ON state will be described. The integrated power amount [kWh] shown in FIG. 3 is the integrated power amount accumulated by the control unit 12, and is the integrated power amount held in the first memory unit 14. The retained integrated power amount [kWh] shown in FIG. 3 is the integrated power amount held in the second memory unit 15.

[0026] At time T11, the control unit 12 receives a relay ON instruction. At time T12, the control unit 12 switches the relay 23 to the ON state. The relay ON count shown in FIG. 3 is the number of times the relay 23 has transitioned to the ON state. As shown in FIG. 3, the power [W] increases to a constant value, and the integrated energy [kWh] increases continuously. The control unit 12 stores the integrated energy [kWh] in the second memory unit 15 at second predetermined intervals, so the retained integrated energy [kWh] increases stepwise. In FIG. 3, the interval D1 corresponds to the second predetermined interval.

[0027] At time T13, a power outage occurs, the supply of power from the commercial power source 4 to the measuring device 1 is stopped, and the relay 23 is switched to the OFF state. As a result, the power [W] becomes 0 [W], and the integrated power amount [kWh] stops increasing. Since the first storage unit 14 is volatile, the integrated power amount stored in the first storage unit 14 is lost when the supply of power from the commercial power source 4 to the measuring device 1 is stopped. On the other hand, since the second storage unit 15 is non-volatile, the integrated power amount stored in the first storage unit 14 is lost when the power supply from the commercial power source 4 is stopped. Even if the supply of power to the measurement device 1 is stopped, the integrated amount of power stored in the second storage unit 15 is not lost.

[0028] At time T14, the power outage is resolved, and power begins to be supplied from the commercial power source 4 to the measuring device 1. The relay 23 is in the OFF state, and the power [W] is 0 [W]. The control unit 12 stores the integrated power amount stored in the second storage unit 15 in the first storage unit 14. Because the integrated power amount stored in the first storage unit 14 has been lost due to the power outage, the control unit 12 writes the integrated power amount stored in the second storage unit 15 to the first storage unit 14, thereby restoring the integrated power amount in the first storage unit 14.

[0029] At time T15, the control unit 12 receives a relay OFF instruction. The relay 23 is in the OFF state, and the control unit 12 maintains the relay 23 in the OFF state. At time T16, the control unit 12 receives a relay ON instruction. At time T17, the control unit 12 switches the relay 23 to the ON state. As shown in FIG. 3, the power [W] increases to a constant value, and the integrated energy [kWh] increases continuously. The control unit 12 stores the integrated energy [kWh] in the second memory unit 15 at second predetermined intervals, so the retained integrated energy [kWh] increases stepwise.

[0030] At time T18, control unit 12 receives a relay OFF command and switches relay 23 to the OFF state. Because relay 23 is in the OFF state, the power [W] becomes 0 [W] and the integrated energy [kWh] stops increasing. Because the integrated energy [kWh] does not increase, there is no change in the retained integrated energy [kWh] retained in second storage unit 15.

[0031] B1 to B7 shown in Fig. 3 are timings (storage timings) at which the control unit 12 writes the integrated energy [kWh] to the second storage unit 15. When the relay 23 is in the ON state, the control unit 12 writes the integrated energy [kWh] to the second storage unit 15 at a second predetermined interval. When the control unit 12 receives a relay OFF instruction or when the relay 23 is switched to the OFF state, the control unit 12 writes the integrated energy [kWh] to the second storage unit 15. Because the control unit 12 stores the integrated energy [kWh] in the second storage unit 15 at predetermined timings, it is possible to reduce the number of times data is written to the second storage unit 15, which is a non-volatile memory.

[0032] The integrated energy stored in the first storage unit 14 is stored in the second storage unit 15 at a second predetermined interval. Even if a power outage occurs and the supply of power from the commercial power source 4 to the measurement device 1 is stopped, the integrated energy before the power outage, which is the integrated energy for a predetermined time period from the time of the power outage, is stored in the second storage unit 15. When the power outage is resolved and the supply of power from the commercial power source 4 to the measurement device 1 is started, the control unit 12 restores the integrated energy stored in the first storage unit 14 by writing the integrated energy stored in the second storage unit 15 to the first storage unit 14. When the relay 23 is turned ON, the control unit 12 updates the integrated energy stored in the first storage unit 14 by adding the instantaneous energy to the restored integrated energy stored in the first storage unit 14. In this way, it is possible to continue measuring the integrated energy even if the supply of power from the commercial power source 4 is stopped. Furthermore, even if a power outage occurs and the power is turned off, it is possible to prevent the integrated power amount held by the measuring device 1 from being completely lost, and it is possible to suppress the loss of the integrated power amount. The measuring device 1 does not have a battery. It is possible to continue measuring the integrated power amount in the measuring device 1 that does not have a battery. Furthermore, even if a power outage occurs and the power is turned off, it is possible to prevent the integrated power amount held by the measuring device 1 that does not have a battery from being completely lost, and it is possible to suppress the loss of the integrated power amount.

[0033] The second storage unit 15 may store a plurality of integrated amounts of power. The second storage unit 15 may store the latest integrated amount of power and the past integrated amounts of power. For example, the latest integrated amount of power is 3, the accumulated amount of electric power for the past two times is the accumulated amount of electric power written to the second storage unit 15 at timing B3 in Fig. 3 and the accumulated amount of electric power written to the second storage unit 15 at timing B2 in Fig. 3. When the supply of electric power from the commercial power source 4 is stopped, the control unit 12 may estimate the accumulated amount of electric power at the time when the supply of electric power from the commercial power source 4 was stopped (the time when the power outage occurred) based on the latest accumulated amount of electric power, the past accumulated amount of electric power, and the time when the power outage occurred, and calculate the estimated accumulated amount of electric power.

[0034] The control unit 12 calculates the difference (power amount) between the integrated power amount written to the second storage unit 15 at timing B4 in Fig. 3 and the integrated power amount written to the second storage unit 15 at timing B3 in Fig. 3. The control unit 12 calculates the ratio (hereinafter referred to as ratio A) of the time from timing B4 in Fig. 3 to the time when the power outage occurs to the predetermined interval (D1). The control unit 12 calculates the power amount A by multiplying the difference (power amount) by ratio A. The control unit 12 may calculate the estimated integrated power amount by adding the power amount A to the held integrated power amount.

[0035] The control unit 12 calculates a first difference (power amount) between the integrated power amount written to the second storage unit 15 at timing B4 in FIG. 3 and the integrated power amount written to the second storage unit 15 at timing B3 in FIG. 3. The control unit 12 calculates a second difference (power amount) between the integrated power amount written to the second storage unit 15 at timing B3 in FIG. 3 and the integrated power amount written to the second storage unit 15 at timing B2 in FIG. 3. The control unit 12 calculates an average power amount of the first difference (power amount) and the second difference (power amount). The control unit 12 calculates a ratio A and calculates a power amount B by multiplying the average power amount by the ratio A. The control unit 12 may calculate an estimated integrated power amount by adding the power amount B to the held integrated power amount.

[0036] When the supply of power from the commercial power source 4 starts, the control unit 12 may store the estimated integrated amount of power in the first storage unit 14. That is, the control unit 12 may restore the integrated amount of power in the first storage unit 14 by writing the estimated integrated amount of power to the first storage unit 14. The control unit 12 may obtain the time of the power outage from the management server 2.

[0037] If the second predetermined interval is set too short, the time required for the number of rewrites of the second storage unit 15 to reach the guaranteed number of rewrites (number of possible rewrites) will be shortened. The guaranteed number of rewrites is, for example, the number of times data can be rewritten normally. On the other hand, if the second predetermined interval is set too long, the accumulated amount of power lost when the power is turned off will increase, and the accumulated error specification will no longer be satisfied. Therefore, it is preferable to set the second predetermined interval appropriately, taking into account the guaranteed number of rewrites and the accumulated amount of power lost.

[0038] The second predetermined interval may be set based on parameters related to rewriting of the second storage unit 15. The parameters related to rewriting of the second storage unit 15 may be stored in a storage device of the control unit 12. The parameters related to rewriting of the second storage unit 15 include, but are not limited to, for example, the guaranteed number of rewrites (number of times rewriting is possible), the guaranteed number of years, and the relay ON rate. The guaranteed number of years is, for example, the number of years for which the performance of the second storage unit 15 is guaranteed. The relay ON rate is the percentage (%) of time that the relay 23 is in the ON state. For example, if the guaranteed number of years of the second storage unit 15 is 10 years, the integrated amount of power is measured over 43,800 hours (h) according to the following formula (1). 50% in the following formula (1) is the relay ON rate. 24 hours x 365 (days) x 10 (years) x 50% = 43,800 hours (Equation 1)

[0039] For example, if the guaranteed number of rewrites is 600,000, dividing 600,000 by 43,800 hours gives approximately 13.7 times / hour, meaning that approximately 13.7 rewrites are possible in one hour. If 12 rewrites are performed in one hour, the second predetermined interval can be set to 5 minutes (60 minutes / 12 times). If the second predetermined interval is 5 minutes, the accumulated power consumption will not be saved in the second storage unit 15 for a maximum of 5 minutes in the event of a power outage. However, this accumulated power consumption will be This is within the acceptable range in the event of a power outage.

[0040] In the above, the relay ON rate is set to 50%, but the relay ON rate is not limited to 50% and may be other values. Also, the relay ON rate may be omitted. In this case, the relay ON rate may be set to 100% in the above (Equation 1).

[0041] The present invention can also be understood as a measurement method including at least a part of the above-described processing, a program for causing a computer to execute at least a part of the above-described processing, or a computer-readable recording medium on which such a program is non-temporarily recorded. The above-described configurations and processing can be combined with each other to constitute the present invention as long as no technical contradiction occurs.

[0042] <Appendix 1> a measuring unit (13) that measures the amount of power supplied from a predetermined power source (4); a volatile first memory unit (14); a non-volatile second storage unit (15); a control unit (12) that sequentially stores an integrated amount of electric power obtained by integrating the amount of electric power measured by the measurement unit (14) in the first storage unit (14) and stores the integrated amount of electric power stored in the first storage unit (14) in the second storage unit (15) at predetermined intervals; Equipped with Measuring equipment (1). <Appendix 2> When the supply of power from the predetermined power source (4) is started after the supply of power from the predetermined power source (4) is stopped, the control unit (12) stores the integrated amount of power stored in the second storage unit (15) in the first storage unit (14). 1. The measuring device (1) according to appendix 1. <Appendix 3> The second storage unit (15) stores a plurality of the integrated amounts of power; When the supply of power from the predetermined power source (4) is stopped, the control unit (12) calculates an estimated integrated amount of power at the time of the stop based on the multiple integrated amounts of power stored in the second storage unit (15) and the time of the stop of the supply of power from the predetermined power source (4); When the supply of power from the predetermined power source (4) starts, the control unit (12) stores the estimated integrated amount of power in the first storage unit (14). 1. The measuring device (1) according to appendix 1. <Appendix 4> The predetermined interval is set based on a parameter related to rewriting of the second storage unit (15). 1. The measuring device (1) according to appendix 1. <Appendix 5> The parameters include the number of guaranteed rewrites and the number of years guaranteed. Attachment 4. The measuring device (1). <Appendix 6> No battery, A measuring device (1) according to any one of appendices 1 to 5. <Appendix 7> A measurement method for a measurement device (1) having a volatile first storage unit (14) and a non-volatile second storage unit (15), comprising: a measuring step of measuring the amount of power supplied from a predetermined power source (4); The integrated amount of electric power measured in the measuring step is stored in the first storage unit ( 14) a first storage step of sequentially storing the data; a second storage step of storing the integrated amount of power stored in the first storage unit (14) in the second storage unit (15) at predetermined intervals; A measurement method having the following characteristics. <Appendix 8> A computer of a measuring device (1) having a volatile first storage unit (14) and a nonvolatile second storage unit (15) a measuring step of measuring the amount of power supplied from a predetermined power source (4); a first storage step of sequentially storing an integrated amount of electric power obtained by integrating the amount of electric power measured in the measurement step in the first storage unit (14); a second storage step of storing the integrated amount of power stored in the first storage unit (14) in the second storage unit (15) at predetermined intervals; A program to execute. [Explanation of symbols]

[0043] 1: Measuring equipment 2: Management server 3: Load 4:Commercial power supply 11: Connection 12: Control unit 13: Measurement section 14: 1st memory section 15:Second memory section 16: Communications Department

Claims

1. a measuring unit that measures the amount of power supplied from a predetermined power source; a volatile first storage unit; a non-volatile second storage unit; a control unit that sequentially stores an integrated amount of power obtained by integrating the amount of power measured by the measurement unit in the first storage unit, and stores the integrated amount of power stored in the first storage unit in the second storage unit at predetermined intervals; A measuring device comprising:

2. the control unit stores the integrated power amount stored in the second storage unit in the first storage unit when the supply of power from the predetermined power source is started after the supply of power from the predetermined power source is stopped; The measurement device according to claim 1 .

3. the second storage unit stores a plurality of the integrated amounts of power; when the supply of power from the predetermined power source is stopped, the control unit calculates an estimated integrated amount of power at the stop time based on the plurality of integrated amounts of power stored in the second storage unit and a stop time when the supply of power from the predetermined power source was stopped; the control unit stores the estimated integrated amount of power in the first storage unit when the supply of power from the predetermined power source starts. The measurement device according to claim 1 .

4. the predetermined interval is set based on a parameter related to rewriting of the second storage unit. The measurement device according to claim 1 .

5. The parameters include the number of guaranteed rewrites and the number of years guaranteed. The measurement device according to claim 4.

6. No battery, The measuring device according to any one of claims 1 to 5.

7. A measurement method for a measurement device including a volatile first storage unit and a non-volatile second storage unit, a measuring step of measuring the amount of power supplied from a predetermined power source; a first storage step of sequentially storing an integrated amount of electric power measured in the measuring step in the first storage unit; a second storage step of storing the integrated power amount stored in the first storage unit in the second storage unit at predetermined intervals; A measurement method having the following characteristics.

8. A computer of a measuring device having a volatile first storage unit and a non-volatile second storage unit, a measuring step of measuring the amount of power supplied from a predetermined power source; a first storage step of sequentially storing an integrated amount of electric power measured in the measuring step in the first storage unit; a second storage step of storing the integrated power amount stored in the first storage unit in the second storage unit at predetermined intervals; A program to execute.

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