JPH10123185A - Power consumption monitor - Google Patents

Abstract

(57) [Summary] [Problem] To obtain a power consumption monitor capable of displaying power in an effective form, and provide consumers with the status of power consumption to raise awareness of energy conservation and evoke action. Aim. SOLUTION: In a power consumption monitor 3, a current transformer 11 converts a current of a power supply line into a current proportional thereto.
Processing means for calculating the instantaneous power consumption and the integrated power consumption based on the detection signal of the current transformer 11 and storing the calculated value of the calculation means and the charge calculation information; A display unit for displaying a value calculated by the means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power consumption monitor for monitoring power consumption of houses, small and medium-sized shops, and the like.

[0002]

2. Description of the Related Art Conventionally, electric power of houses, small and medium-sized stores, etc.
In this system, a power supply company grasps the amount of power used, and the consumer pays an electricity fee according to the received power and the used amount. The power consumption is obtained by integrating the total amount of power consumption in a certain period by a watt hour meter. In general, a so-called induction type in which an aluminum disk is rotated at a speed proportional to electric power using a moving magnetic field is widely used as a watt hour meter. The watt hour meter is installed outdoors to ensure accessibility for measurement. Therefore, when the consumer wants to know the electricity charge using the watt hour meter, the integrated value (instruction number) at the start of the period is recorded, and this is subtracted from the integrated value at the end of the period, and the value is subtracted from the integrated value at the end of the period. By calculating the usage amount and multiplying it by the unit price of the power rate, the power usage rate in that period could be known.

[0003]

The growth of energy consumption in Japan is extremely high among OECD countries. It is said that Japan's energy system is more efficient and more energy efficient than other countries, but during the bubble period from the late 1980s, energy consumption for consumer use, that is, for improving comfort in life, increased. And that trend is still continuing. Electric power, gas, heat and the like are intangible resources, and water is a tangible resource but has a fast flow considering the time it is stocked in a building. Furthermore, unlike other furniture and products, they are sourced from building installed elements as building equipment. In addition to being invisible or having a strong flow-like element, the fact that there is almost no power outage or water cutoff due to lack of capacity, etc., tends to cause the illusion of infinity and consume it like hot water. In a culture premised on mass production and mass consumption, screaming for energy and resource savings would be futile. In order to give a feeling of consumption, it is important to visually present the actual state of the flow to the consumer. Electric power, gas, water supply, and heat (district cooling / heating, central cooling / heating, etc.) are the energy and resources supplied by building equipment. They have the same characteristics in that they are intangible or tangible, but their flow is extremely difficult to grasp. In particular, in the case of electric power that is particularly important and easy to measure, it is necessary to display this flow in a visible and effective form in order to achieve energy saving and resource saving. However, conventionally, in houses, small and medium-sized stores, etc.,
In most cases, the electricity supplier only installs a watt hour meter outdoors to keep track of the amount of electricity used. Even if only the integrated value is looked at, it is necessary to calculate the power consumption in a certain period, so that at present, the usage fee before the billing is actually not grasped. The present invention has been made in view of the above circumstances, and provides a power consumption monitor capable of displaying power in an effective form, thereby providing consumers with a status of power consumption, thereby contributing to energy saving. The purpose is to improve the quality of the information and to evoke action.

[0004]

In order to achieve the above object, a power consumption monitor according to the present invention comprises a current transformer for converting a current of a power supply line into a current proportional thereto, an arithmetic unit and a storage unit. Processing means for calculating the instantaneous power consumption and the integrated power consumption based on the detection signal of the current transformer, storing the calculated value of the calculating means and the charge calculation information, and displaying the calculated value of the processing means. And a display unit. Further, the power consumption monitor includes a switch for selecting an instantaneous power consumption, an integrated power consumption, or a charge, and the instantaneous power consumption,
One of the accumulated power consumption and the charge may be displayed on the display unit. Further, an outlet adapter is provided in place of the current transformer, and the outlet adapter has one end inserted into the outlet and the other end inserted with a power plug of the device to be measured, and supplies an electric current to be supplied to the device to be measured. A current transformer for converting the current into a current proportional to the current transformer may be provided.

In the power consumption monitor configured as described above, the current in the power supply line is converted into a detected current proportional to the current by the current transformer, and the processing means determines the instantaneous power consumption and the integrated power consumption based on the detected current. Is calculated, and the calculated value is displayed on the display unit, so that the consumer can routinely observe changes in power consumption according to various aspects of power consumption. In the power consumption monitor in which any one of the display information is displayed by the changeover switch, all the calculation information need not be displayed, and the power consumption of the power consumption monitor itself can be suppressed. Furthermore, in a power consumption monitor equipped with an outlet adapter, by temporarily supplying power through an outlet by supplying power to the device to be measured by relaying the outlet adapter,
The power consumption of the mobile type measurement target device can be easily observed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a power consumption monitor according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing a schematic configuration of a power consumption monitor according to the present invention. In order to feed back the actual state of power consumption to the user, it is necessary to provide an instantaneous wattmeter having an analog or digital output function separately from a conventional watt hour meter installed outdoors.

When measuring the total power consumption in a house, the power consumption is measured on a service line downstream of the power integrator (on the house side) or on a distribution board. At present, it is considered that electric power is drawn into a single-phase two-wire, single-phase three-wire, or three-phase three-wire. For example, in the case of a single-phase three-wire, it is necessary to measure two points of voltage and two points of current.
Assuming V, measurement is possible with two current transformers (CT). In the case of a three-phase three-wire system, measurement is performed by a two-current, two-voltage, two-power meter method or a three-current, three-voltage, three-power meter method.

[0008] As shown in the figure, for example, when power is supplied to the distribution board 1 by a single-phase three-wire, the power consumption monitor 3 monitors the middle of the three wires before being supplied to the distribution board 1. The CT and 11 are installed on the two wires 5 and 9 excluding the sex wire 7 and the measured data is led to the device main body 15. The measured current and voltage are shielded by a shield means 17 and the like so as to prevent noise from being introduced, and guided to a processing means (not shown) of the apparatus main body 15. The processing means is mainly composed of an arithmetic means (CPU) and a storage means (ROM). The processing means digitizes analog data of the measured current and voltage via an A / D converter.
The PU calculates the instantaneous power consumption and uses the information in the storage means to simultaneously convert useful information to the consumer.

The information calculated by this processing means includes, for example, an instantaneous value of power consumption, a daily integrated value, a monthly integrated value, a power cost corresponding to the monthly integrated value, an average power consumption of the same day or the same month of last year. It is useful information for self-evaluation of the power consumption at that time, such as the amount. Furthermore, by measuring outside temperature, outside air humidity, insolation, indoor temperature, indoor humidity, etc. as seasonal fluctuation factors of power consumption, and displaying them on the same device, it becomes information for essentially enlightening about energy saving. .

[0010] The power consumption monitor 3 is provided with a changeover switch 19 and a display information selection lamp 21. When the changeover switch 21 is depressed, the display information selection lamps 21 provided corresponding to the instantaneous value, the daily integrated value, the monthly integrated value, the fee, etc. are sequentially turned on, and the value of the information selected in conjunction with it is described later. Is displayed on the display unit.

In order to perform such processing, data such as a fee system (basic fee, metered fee), a calendar, and a meter reading date are stored in the storage means. Further, for these processes, a clock is required for the processing means. The charge information and the clock may need to be modified, so that they have a function of setting them. The setting function may be a function of a communication function or a function of changing stored contents by a storage unit such as a removable card type memory.

The power consumption monitor 3 requires a power supply 23. The power source 23 is a dry cell, a rechargeable battery, A
Electricity is supplied through a C adapter or from an outlet and converted by a transformer inside the device.

Further, the power consumption monitor 3 needs a display unit 25 for giving the calculated data to the consumer. As an inexpensive display, an LED display is conceivable, but a liquid crystal can be used although it is somewhat expensive to ensure good visibility. Since the power consumption monitor 3 is a device that supports the promotion of energy saving, it is not preferable to use energy for the draining of information. Therefore, the changeover switch 19 can be used to selectively display desired information or when not used (for example,
When the user goes out, goes to bed, etc.), it is preferable to hide the display.

If the power consumption monitor 3 is used for a house, the monitor is a main building of the building. In addition, they are integrated except for the measuring part, and they are installed in places that are easy to see and effective, such as near the entrance, living room, and kitchen.

The power consumption monitor 3 configured as described above
The operation of will be described. The power consumption monitor 3 digitizes the measured current and voltage analog data via an A / D converter, and calculates the power consumption by the CPU. In addition, the sum of the electric energy and the time is calculated for each appropriate time to calculate the integrated consumption, and the calculated integrated consumption is stored in the memory. This value is
In the case of one-day integration, for example, 0 is cleared at 24:00 at midnight, and in the case of month integration, for example, 0 is cleared at 0:00 on the first day of each month. Further, based on the monthly accumulated consumption and the cost data (basic charge, usage-based charge) of the storage means, the amount of power consumption up to that point in the month is calculated. These calculation results are transmitted to the consumer through the display unit 25.

[0016] Therefore, the consumer can determine how the instantaneous power consumption changes when, for example, the air conditioner is turned on or off, or when the refrigerator is opened and closed, or when the light is kept on. Can be monitored on a daily basis, and the lifestyle can be changed to a lifestyle that is empirically guided by cost awareness and leads to energy conservation.

The power consumption monitor 3 can be used not only as a main unit but also as a temporary or mobile type. For example, when purchasing home electric appliances such as televisions and air conditioners, it is necessary to demonstrate in a store how much power is consumed if energy saving awareness is improved in the future. At this time, it is possible to give the consumer a feeling of presenting the power cost instead of the power consumption. For this reason, in the temporary / mobile type, the structure of the measurement unit is important. In such a case, it is necessary to obtain data necessary for measuring the power consumption between the outlet and the device to be measured.
It is convenient to prepare a special throughput type as 7. In the case of a single phase, it can be constituted by branching two wires and providing one CT. On the other hand, in the case of a three-phase three-wire, as shown in FIG. 3, two or three CTs are provided by branching the three wires, and a voltage value is also required. Therefore, an adapter in consideration of safety is required. As described above, in the measurement unit, the voltage cannot be measured without directly touching the electric wire, but the current can be measured by CT. Both can be built into an adapter, the latter of which can also be accommodated by using a removable clamp type CT.

The power consumption monitor 3 can also be used for metering in the future with the consent of the power supply company, thereby avoiding double investment.

Furthermore, the power consumption monitor 3 can be expected to further increase the degree of use of the calculated data, such as transmission and reception of information by communication, by exchanging information with home automation or an information device such as a personal computer.

[0020]

As described above in detail, according to the power consumption monitor according to the present invention, changes in power consumption according to various aspects of power consumption can be observed on a daily basis. Energy awareness can be improved. In the power consumption monitor in which any one of the display information is displayed by the changeover switch, only the desired information is displayed from the plurality of calculated information, and the power consumption of the power consumption monitor itself can be reduced. Furthermore, in the power consumption monitor equipped with the outlet adapter,
By supplying power to the measurement target device via the outlet adapter, the power consumption of the temporary and mobile type measurement target device can be easily observed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a schematic configuration of a power consumption monitor according to the present invention.

FIG. 2 is an explanatory diagram of a single-phase outlet adapter used for a mobile-type power consumption monitor.

FIG. 3 is an explanatory diagram of a three-phase outlet adapter used for a mobile-type power consumption monitor.

[Explanation of symbols]

 3 Power consumption monitor 5, 7, 9 Power supply line 11 Current transformer 19 Changeover switch 25 Display unit 27 Outlet adapter

Claims (3)

[Claims] 1. A current transformer for converting a current of a power supply line into a current proportional to the current transformer, an arithmetic unit and a storage unit, and calculates an instantaneous power consumption and an integrated power consumption based on a detection signal of the current transformer. A power consumption monitor comprising: processing means for storing the calculated value of the calculating means and the charge calculation information; and a display unit for displaying the calculated value of the processing means. 2. A switch for selecting an instantaneous power consumption, an integrated power consumption, or a charge, and by selecting display information with the switch, the instantaneous power consumption, the integrated power consumption, or the charge is selected. 2. The method according to claim 1, further comprising: displaying one of the plurality of information on the display unit.
Power consumption monitor as described. 3. An outlet adapter is provided in place of the current transformer. The outlet adapter has one end inserted into an outlet and the other end inserted with a power plug of a device to be measured, and supplied to the device to be measured. 2. A current transformer for converting a changing current into a proportional current.
Or the power consumption monitor according to 2.