RU2786779C1 - Electricity meter with data logging - Google Patents

Abstract

FIELD: metrology.

SUBSTANCE: invention relates to metrology. The electricity meter contains a digital wattmeter with a built-in power supply, a real-time clock, the first input of the digital wattmeter is configured to be connected to a current transformer, and the second input is configured to be connected to a 220 V voltage network, equipped with a programmable microcontroller, a card reader with the ability to record information on Micro-SD and a light signaling device, while the first input of the microcontroller is connected to the output of a digital wattmeter, the second input is connected to a real time clock, the third input is configured to connect to the programmer, the first output of the microcontroller is connected to the card reader, and the second output is connected to the alarm device , and the microcontroller is configured to change the interval for recording power consumption readings and the value of maximum power consumption.

EFFECT: expanding the functionality and scope of the electronic meter.

1 cl, 2 dwg, 1 tbl

Description

The invention relates to electrical engineering, namely, to measuring equipment, and can be used to analyze and account for the electricity consumed by household receivers (air conditioners, electric stoves, electric heaters, electric underfloor heating, etc.) for a certain period of time.

A known electricity meter and an adapter module for it (patent RU No. 2714858, publ. 02/19/2020, IPC G01R 22/06, H04V 3/54), containing a measuring unit, a communication unit for transmitting data signals in the communication band over a power cable, a unit processing to control the measuring unit and the communication unit. The communication unit is adapted to adapt the communication band to the communication environment and comprises a signal processing unit, a switch connected to the signal processing unit, and a control module for controlling the switch.

The disadvantages of this technical solution are the narrow scope and low functionality due to the registration of power consumption only active power and the impossibility of using this device to analyze the power consumption of home electrical receivers.

The closest in technical essence to the proposed invention is a device for measuring electrical energy (patent RU No. 2661673, publ. 07/18/2018, IPC G01R 22/10), containing a current sensor, a voltage sensor, a converter of electrical power into pulse frequency, a deviation detector of the root mean square value voltage from GOST requirements, summing device, processing module, encoder, removable storage, real time clock, indicator, data transfer interface.

The disadvantages of this technical solution are the narrow scope and low functionality due to the binding of the summation of electricity consumption to the quality of electricity and the assessment of power consumption only active power, which makes it impossible to use this device to measure the power consumption of household electrical receivers.

The technical objective of the proposed invention is the ability to measure and record the history of electricity consumption by household consumers for any period of time.

The technical result consists in expanding the functionality and scope of the electronic meter.

This is achieved by the fact that the well-known electricity meter containing a digital wattmeter with a built-in power supply, a real-time clock, with the first input of the digital wattmeter configured to connect to a current transformer, and the second input configured to connect to a 220 V voltage network, is equipped with a programmable microcontroller , a card reader with the ability to record information on Micro-SD and a light signaling device, while the first input of the microcontroller is connected to the output of a digital wattmeter, the second input is connected to a real-time clock, the third input is configured to connect to the programmer, the first output of the microcontroller is connected to the card reader, and the second output is connected to the alarm device, and the microcontroller is configured to change the interval for recording power consumption readings and the value of the maximum power consumption.

The essence of the invention is illustrated by drawings, where in Fig. one

the general circuit diagram of the meter is presented

electricity with data logging, in Fig. 2 is an example

building a graph of power consumption with a selected averaging period for a specified date.

The electricity meter with data logging contains a digital wattmeter 1 with a built-in power supply, the first input of which is configured to be connected to a current transformer 2, and the second input is capable of being connected to a 220 V voltage network 3.

The output of the digital wattmeter 1 is connected to the first input of the microcontroller 4, the first output of which is connected to the card reader 5. The real time clock 6 is connected to the second input of the microcontroller 4, and the light signaling device 7 is connected to the second output. The third input of the microcontroller 4 is configured to be connected to the programmer eight.

The microcontroller is made programmable with the possibility of changing the interval for recording power consumption readings and the value of maximum power consumption.

The electricity meter with data logging works as follows.

The programming of the microcontroller 4 is carried out using an external programmer 8, connected by its output to the communication interface associated with the third input of the microcontroller 4.

The microcontroller 4, the card reader 5, the real time clock 6, the light signaling device 7 receive power from the power supply built into the digital wattmeter 1. In this case, the digital wattmeter 1, using the current transformer 2 connected to its inputs and the voltage network 220 V 3, analyzes the flowing power in the circuit, calculating the total power consumed by the household appliance connected to the device, and stores this information in the internal memory.

When loading and initializing, the microcontroller 4 receives the current time and date from the real time clock 6, after which every minute, due to the signaling to its first input through interrupts generated by the real time clock 6, it keeps track of the current time. Each time such an interrupt is triggered, the remainder of the integer division of the current time by the averaging interval specified in the program of the microcontroller 4 is found.

If this value is equal to zero, then the microcontroller 4 requests the current readings of power consumption from the digital wattmeter 1, which, in response to this request, provides an array of data, including:

- current time and date;

- network voltage;

- instantaneous full current;

- instantaneous active power;

- instantaneous power factor;

- total electricity consumption for the current day.

The microcontroller 4 writes this data to the Micro-SD card using the card reader 5. If the microcontroller 4 cannot communicate with the digital wattmeter 1, if the microcontroller 4 does not receive a signal about the current time from the real time clock 6, or if it is impossible to write data to the Micro-SD card using the card reader 5, output information about the error through the alarm device 7. When specifying the maximum allowable power consumption when programming the microcontroller 4, it is possible to indicate the excess of this parameter by means of the alarm device 7. It is carried out by comparing the value specified in the program of the microcontroller 4 and the value obtained by polling the digital wattmeter 1 by the microcontroller 4 .

Thus, unlike the prototype device (where the electricity meter can calculate and transmit the total power consumed from the moment it is turned on via its own communication line), in the proposed invention, the microcontroller 4 communicates with the real-time clock 6 and the card reader 5, polls the digital wattmeter 1 and conducts independent data logging. Also, the programmability of the microcontroller 4 allows you to select the period for recording power consumption readings, setting the value of the maximum power consumption, upon reaching which the alarm device 7 will work. Real time clock 6 allows you to know the exact current time, and based on this information, the microcontroller 4 decides at what point to take readings power consumption. Card reader 5 allows you to save the received data on a Micro-SD memory card for further processing of the received information on a computer. All these aspects make it possible to obtain additional extended functionality of the electricity meter in the form of the possibility of data logging.

As a result of the operation of the device, data is saved to the Micro-SD card in the following format, shown in Table 1:

Thanks to the specified tabular form of the output data, the microcontroller 4 subsequently calculates the power P _i using the formula:

Where T _ocp is the specified averaging time, P _summ(i) is the total electricity consumed to date, P _summ(i-1) is the total electricity consumed by the last reading moment.

Based on the calculated data, it is possible to plot power consumption graphs with a selected averaging period for a specified date (figure 2).

Thus, the proposed invention implements the recording of data on power consumption with a given averaging period, which makes it possible to keep a history of power consumption, analyze it, find the maximum and minimum consumption, plot its graphs and general control over power consumption, which allows updating methodological data on the calculated loads of modern household appliances. power receivers to clarify the calculated power consumption of the domestic sector and reduce the discrepancy between the calculated and actual values of power consumption. The device can be used to signal the excess of the installed power consumption and control household electrical receivers to reduce the peak value of the apartment's power consumption.

The use of the invention allows expanding the functionality and scope of the electricity meter by periodically recording the power consumption readings of household receivers to analyze power consumption and refine their calculated power, which improves the accuracy of calculations of electrical loads in the domestic sector.

Claims (1)

Electricity meter with data logging, containing a digital wattmeter with a built-in power supply, a real-time clock, the first input of the digital wattmeter is configured to be connected to a current transformer, and the second input is configured to be connected to a 220 V voltage network, characterized in that it is equipped with a programmable microcontroller, a card reader with the ability to record information on Micro-SD and a light signaling device, while the first input of the microcontroller is connected to the output of a digital wattmeter, the second input is connected to a real time clock, the third input is configured to connect to the programmer, the first output of the microcontroller is connected to card reader, and the second output is connected to the alarm device, and the microcontroller is configured to change the recording interval of power consumption readings and the maximum power consumption value.

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