JPS6217897A - Power measuring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a power measuring device used for monitoring power in buildings and the like.

BACKGROUND ART A conventional power measuring device has a configuration as shown in FIG. That is, the electric current transformer 41 is provided with an instrument phase change IE device 41 that converts a high voltage to a voltage that is compatible with the power transducer 43, and an instrument current transformer 42 that converts current into a voltage that is compatible with the power transducer 43. The quadrature transducer 43 converts the voltage and current of the single-instrument HE transformer 41 and the instrument current transformer 42 into a DC voltage signal corresponding to electric power. This signal is then output to the terminal device 44. This terminal device 44 is composed of an A/D converter 46, a microcomputer 12, and a driver 13.
2 is a so-called one-chip microcomputer having a CPU, ROM, RAM, parallel input/output section, and serial input/output section. The terminal device 44 converts the DC voltage signal outputted from the electric quadrature transducer 43 into a parallel digital signal using an A/D converter 46 and inputs the parallel digital signal to the microcomputer 12. A parallel digital signal corresponding to the power input to the microcomputer 12 is converted into a serial signal and output to the driver 13. The driver 13 amplifies the serial signal from the microcomputer 12 and transmits it to the central device 1 through the entire transmission line 4 . This central device 1 is composed of a computer 14 and an input/output terminal R6232C port 15 of the computer 14, and the serial signal from the terminal 44 is connected to the R6232C port 15.
232C port 1-15 and read into the computer 14 as a power value.

Problems to be Solved by the Invention In such a conventional configuration, an instrument transformer that converts the voltage and current to be measured into a voltage and current that are compatible with the electroquadratic transducer, a single current transformer, and this voltage, An expensive power generator was required to convert the current into a DC voltage signal equivalent to electrical power.

The present invention solves these problems by remotely measuring power using a commonly used watt-hour meter without using a single transformer, an H1 current transformer, or a power transducer. The object of the present invention is to provide a power measuring device that can perform the following steps.

Means for solving the problem In order to solve this problem, the power measuring device of the present invention has the following features:
A power meter with a transmitting device that generates a pulse every time a certain amount of power is measured, a pulse measuring unit that opens the number of pulses,
A power calculation means that calculates the power from this number of pulses, a real communication means that converts this blue power value into a serial signal, and a terminal device equipped with a serial signal output section that outputs a serial signal. This terminal device transmits a serial signal to a central device via a transmission line, and this central device totalizes the power.

Operation With this configuration, the power calculation means calculates the power by subtracting the number of pulses corresponding to the wattmeter, and this value is converted into a serial signal by the serial communication means and sent from the serial signal output section via the transmission line. The data can now be transmitted to the central device.

EMBODIMENT F From the following, one embodiment of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, the terminal device 2 includes a pulse reduction section 5 that counts the pulses of the power meter 3 with a transmitting device, a power calculation means 6 that calculates power from the number of pulses, and a power calculation means 6 that serially outputs power values. It is composed of a serial communication means 7 that converts the serial signal into a signal, and a serial signal output section 8 that amplifies the serial signal.

This terminal device 2 uses a pulse measuring section 5 to measure the number of pulses generated within a certain period of time from a power meter 3 with a transmitting device.
and input it to the power calculation means 6. The power calculation means 6 calculates the power from the number of pulses generated within a certain period of time, the serial communication means 7 converts the power value into a serial signal, and the serial signal output section 8 sends the power to the center via the transmission line 7. transmitted to device 1;

The details will be explained in detail 1 from FIG. 2. In FIG. 2, the central device 1 is composed of a computer 14 and an input/output terminal R8232C port 16 equipped on the computer 14. The pulse measuring section 5 is composed of a counter 1o and a pulse oscillator 11. The serial output section 8 is composed of a driver 13. The microcomputer that inputs the signal from the pulse measuring section 5 and outputs the signal to the serial signal output section 8 includes a CPU and a ROM.

It is a so-called one-chip microcomputer that has R, AM, parallel input/output sections, and serial input/output sections. The power meter 3 with transmitter ff that inputs the signal from the pulse measuring section 5 is shown in FIG.
As shown in a), one pulse signal 21 is output every time a certain amount of electric power W (whl) is consumed.
The pulse oscillator 11 of the pulse measuring section 6 outputs one pulse signal 22 to the microcomputer 12 at fixed time intervals T[:h] as shown in FIG. 3(b). The microcomputer 12 receives the pulse i from the pulse oscillator 11.
At the rising edge of the pulse No. 22, the pulse signal 21 is input and the clear signal 24 shown in FIG. Start counting the number of pulses from 3.

At the next rising edge of the pulse from the pulse oscillator 11, the microcomputer 12 inputs the count value S of the counter 10 and returns the scoop counter to its initial state. From the input count value S and the oscillation period T [h:] of the pulse oscillator, the power P [w] is determined by equation (1) and outputted to the driver 13 as a so-real signal 25.

P = W - S/T [w:] - (1) The driver 13 amplifies the serial signal 25 from the microcomputer 12 and transmits it to the R8232C boat 15 via the transmission line 4. The computer 14 of the central unit is R
The power is read and collected from the serial signal input to the 8232C boat 16.

Effects of the Invention As described above, according to the present invention, since the pulses of the conventionally installed watt-hour meter are input, there is no need to provide a utility transformer, a power transformer, a power transformer, and a power meter. Without,
You can measure the amount of electricity used.

Further, it is possible to obtain the effect that measurement can be performed remotely from the location where the central device is installed without having to travel to the location where the watt-hour meter is installed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a power reduction measuring device according to an embodiment of the present invention, FIG. 2 is a detailed block diagram of the power meter 6111 device, FIG. 3 is a timing chart showing signals of each part, and FIG. 4 1 is a diagram of a conventional Fi power measurement device. 1... Central device, 2... Terminal device, 3... Energy meter with one source device, 4... ...Transmission line, 6...
... Pulse old part 4111, 6... Power calculation means, 7
... Serial communication means, 8... Serial signal output section.

Claims (1)

[Claims] A power meter with a transmitting device that generates pulses to measure a constant amount of power, a pulse measuring section that measures the number of output pulses, and a power calculation means that calculates power from the number of pulses.
A terminal device is provided that is equipped with a serial communication means that converts this calculated power value into a serial signal, and a serial signal output section that outputs this serial signal, and this terminal device sends the serial signal to the central device via a transmission line. A power metering device configured to transmit and aggregate the power by this central device.