JPH079104Y2 - Electricity meter with transmitter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention provides a signal proportional to electric energy, which is used for remotely monitoring the measured value of an electric energy meter or for automatically reading the measured value of an electric energy meter. The present invention relates to an improvement of a watt hour meter with a transmitting device.

[0002]

2. Description of the Related Art In recent years, in order to improve efficiency in power management and rationalize power supply and demand, the amount of power used by a customer is remotely monitored or the amount of power used is automatically read. A watt-hour meter provided with a transmitter for sending an electric signal proportional to the amount of electric power measured by the watt-hour meter has been put into practical use.

In the watt hour meter with the transmitter, the meter constant of the watt hour meter (the number of revolutions per 1 kWh of the watt hour meter) varies depending on the rating, the number of phases, and the line type.
Since the composite transformation ratio varies depending on the voltage / current to be measured, in order to output a signal proportional to the amount of power with an integer power of 10 (10 ⁿ times), the transmitter must have a unique power meter in advance. It is necessary to set the transmission constant, which is information. In order to realize this need, the present applicant, by another application on the same day as the present application, provides a transmitter with a control circuit by a microcomputer, a constant storage circuit, and a transmission constant input terminal. Equipped with an external transmission constant setting means connected to the transmission constant input terminal, the power transmission meter's unique information (meter constant, number of signal disk slits, composite transformation) Ratio, pulse weight, and pulse width) are input, the transmission constant data necessary for the target watt-hour meter is processed beforehand, and this data is written from the transmission constant input terminal to the constant storage circuit of the transmission device. We have proposed a watt-hour meter with a transmitter.

[0004]

In the transmitter of an ordinary watt-hour meter with a transmitter, since each circuit of the transmitter is operated only by the stabilized DC power source of the transmitter obtained from the commercial frequency power. , If the electricity meter is unwired,
When commercial frequency power is not applied to the electricity meter,
It is not possible to write the transmission constant data into the constant storage circuit via the control circuit of the transmission device, and the necessary preparatory work must be done before the start of the power system's use so that it can be used by consumers at the same time as power supply. It becomes inconvenient for convenience.

An object of the present invention is to solve the above-mentioned problems and to provide a transmitter with a transmitter capable of writing transmission constant data of the wattmeter even when commercial frequency power is not supplied to the transmitter with a transmitter. It is to provide an electricity meter.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, an oscillation constant input terminal to which a data output terminal of an external oscillation constant setting means having a DC power source is connected, and a DC power source output terminal of the oscillation constant setting means are connected. An auxiliary power supply terminal, a constant storage circuit for storing the transmission constant input from the transmission constant input terminal, and an arithmetic processing of the output of a transmission pulse signal for each predetermined weighing value according to the transmission constant stored in the constant storage circuit. And a power supply circuit for receiving the DC power supplied from the auxiliary power supply terminal.

[0007]

When the commercial frequency power is not supplied to the watt hour meter, the DC power source for operation is sent from the DC power source output terminal of the external transmission constant setting means to the transmitter through the auxiliary power source terminal of the watt hour meter. Supply power.

[0008]

1 is a block diagram of a transmitter of an electric energy meter with a transmitter including an external transmission constant setting means, which is an embodiment of the present invention. FIG. 2 is a circuit diagram of the transmitter including the transmitter constant of the transmitter-equipped electric energy meter. The configurations of the transmitter and the external transmission constant setting means will be described with reference to FIGS.

The optocoupler circuit 1 is arranged 2 adjacently.
The light receiving elements PI1b and PI of the two optical coupling elements PI1 and PI2 are formed by rotation of a rotor (not shown) of the watthour meter.
Two-phase pulse signals having different phases are output from 2b and input to the central control circuit 3 of the transmitter 2.

The central control circuit 3 includes a semiconductor integrated circuit IC1 for arithmetic processing, capacitors C6 and C7, and a resistor R5.
It is composed of R6 and performs the following control operation. (1) The phase relationship between the two-phase signals (metering pulse signals) from the optical coupling elements PI1 and PI2 is detected, and the normal rotation and the reverse rotation of the rotor are discriminated. (2) The two-phase signals from the optical coupling elements PI1 and PI2 are counted, and the electric energy is integrated and measured. (3) The transmission pulse signal proportional to the integrated and metered electric energy is output to the transmission pulse output circuit 4 by a preset transmission constant such as a meter constant and a pulse width. (4) The transmission constant data is written in and read from the constant storage circuit 6 by externally connecting a transmission constant setting means described later to the transmission constant input terminal t.

The transmission pulse output circuit 4 includes a transistor Q.
2. A mercury contact relay RY and a diode D2, which output non-voltage contact signals from the output terminals O1 and O2.

The oscillation constant input / output circuit 5 includes a transistor Q
1 and resistors R2, R3 and R4, and by connecting a transmission constant setting means described later from the outside,
Transmission constant data such as instrument constants and pulse widths are written and read in the constant storage circuit 6 via the central control circuit 3.

The constant storage circuit 6 comprises a semiconductor integrated circuit IC2 for non-volatile memory and a capacitor C8, and stores the set transmission constant of the transmission pulse signal.

The crystal oscillating circuit 7 oscillates a system clock signal and a timer clock signal by the crystal oscillator XTAL.

The power failure detection circuit 8 includes a voltage detector IC4, a diode D3, a capacitor C9, and resistors R7 and R.
A voltage comparison circuit composed of 8 detects a power failure and a power recovery state and outputs a reset signal to the central control circuit 3.

The protection circuit 9 is composed of a filter coil L, a surge absorber SA, and a capacitor C1, and protects each circuit from an abnormal voltage that enters the power supply terminals P1 and P2.

The voltage dividing circuit 10 is composed of a resistor R1 and a capacitor C2, and divides the input voltage to the rectifying circuit 11. The AC voltage applied to the power supply terminals P1 and P2 is 1
Capacitor C2 depending on whether it is 00V or 200V
Change the capacity of and change the voltage division ratio.

The rectifier circuit 11 full-wave rectifies the AC input voltage by the rectifier D1, the Zener diode ZD, and the capacitor C3, and supplies it to the constant voltage circuit 12.

The constant voltage circuit 12 stabilizes the DC voltage that is full-wave rectified by the constant voltage element IC3 and the capacitors C4 and C5.

The optical coupling element circuit 1 is constructed on one printed wiring board, the rest of the circuit of the transmitter 2 is constructed on another printed wiring board different from that, and a jumper is provided between these two printed wiring boards. It is fixedly connected by the wire J.

The external transmission constant setting means 13 is
Control circuit (CONT in FIG. 2) 14, DC power supply (P in FIG. 2)
W) 15 and a reverse current blocking diode D, and a data output terminal S and a DC power supply output terminal Q thereof are connected by a modular cable 16 to a transmission constant input terminal t of the transmitter 2 and an auxiliary power supply terminal X (the connector of FIG. 2). CN).

FIG. 3 is a diagram showing the connection of the external transmission constant setting means and the watt-hour meter of the watt-hour meter with a transmitter, which is an embodiment of the present invention, and FIG. Fig. 3 shows the connection when using a personal computer.
(B) shows a connection by a portable transmission constant setting device.

FIG. 4 is a block diagram of an external transmission constant setting means of the electric energy meter with a transmission device.

In the transmission constant setting means constituted by combining the existing personal computer 17 and the writer 18 for interface conversion as shown in FIG. 3A, first, the personal computer 17 is targeted. The specific information of the watt-hour meter 19 (instrument constant, number of slits on the signal disk, composite transformation ratio, pulse weight, and pulse width) is input. With the personal computer 17,
By the logic programmed in advance, these input information are arithmetically processed into transmission constant data required inside the watthour meter 19 which is the target.

The arithmetically processed transmission constant data is converted from the interface of the personal computer 17 into the interface of the electric energy meter by the interface 20 and I / O 21 of the writing device 18, and the modular cable 16 causes the writing device 18 to make the electric energy meter. 19 are connected to the oscillator 2 (see FIGS. 1 and 2) at the oscillation constant input terminal t and the auxiliary power supply terminal X (see FIG. 1), and are transmitted to the central control circuit 3 via the oscillation constant input / output circuit 5. The transmission constant data is transmitted and received, and the central control circuit 3 writes the data in the nonvolatile constant storage circuit 6.

The writer 18 is a DC power source 2 using a battery.
2 is mounted, and the DC power supply 22 supplies the operating DC power to the interface 20 and the I / O 21 of the writing device 18, and operates the transmitter 2 of the watt-hour meter 19 through the modular cable 16. Supply DC power. In this case, the personal computer 17 also operates by the battery.

Further, in the portable oscillation constant setting device 23 as shown in FIG. 3B, when the unique information of the target electric energy meter 19 is inputted by the attached ten key 24,
These are displayed on the display 25. Transmission constant setting device 23
The microcomputer 26 of the above-mentioned calculates and processes the input information into necessary transmission constant data inside the watt-hour meter 19 which is a target by the pre-programmed logic, and from the I / O 27 through the modular cable 16 of the transmission device 2. Transmission constant input t (see FIG. 1, connector C in FIG. 2)
N), and exchanges data with the central control circuit 3 via the transmission constant input / output circuit 5. The central control circuit is
The transmission constant data is written in the nonvolatile constant storage circuit 6.

The transmission constant setting device 23 is equipped with a DC power supply 28 using a battery. The DC power supply 28 is used for operating the display 25 of the transmission constant setting device 23, the microcomputer 26, and each circuit of the I / O 27. DC power source for the power meter and power meter 1 via modular cable 16
A DC power supply for operation is supplied to the transmitter 2 of FIG.

The personal computer 17 and the interface 20 shown in FIG. 4A and the FIG.
The numeric keypad 24 and the microcomputer 26 of the transmission constant setting device 23 in FIG.
(CONT in FIG. 2).

Further, the reverse current blocking diode 29 in the writer 18 of FIG. 4A and the reverse current blocking diode 30 in the oscillation constant setting device 23 of FIG. 4B.
In both cases, when the external transmission constant setting means is used while being connected to the transmission device 2 in the watt-hour meter 19, the distribution system restores power from the power failure state again, and This is for preventing the inflow of a DC current from the transmitter 2 side to the external transmission constant setting means even when the commercial frequency power is supplied.

The transmission constant is externally written into the constant storage circuit 6 of the transmission device 2 by an external transmission constant setting means, and the central control unit 3 of the transmission device 2 reads it to count and calculate a two-phase signal and set it. By outputting the transmission pulse signal according to the specified transmission constant, it is possible to set the transmission constant quickly and easily even when the rating, the number of phases, and the line type of the watt-hour meter are different, and to Although it is not necessary to individually provide a transmission constant setting means in the transmitters 2 provided inside the watt-hour meters installed in many homes, it is possible to reduce the cost of the transmitters 2.
Further, by making it possible to supply the DC power for the operation of the electronic circuit of the transmitter 2 of the watt-hour meter 19 from the external transmission constant setting means, the transmitter 2 is simply assembled on the printed wiring board. Status, when the watt-hour meter 19 is in an unwired state, when the power distribution system has finished construction and is unpowered, or when commercial frequency power is not being applied to the power distribution system due to a power outage, etc. In addition, it becomes possible to write or read the transmission constant of the watt-hour meter 19 to the transmitter 2 of the watt-hour meter 1.
It is possible to improve the efficiency of the manufacturing of 9 and the construction of the distribution system.

[0032]

As described above, according to the present invention,
From the transmission constant input terminal to which the data output terminal of the external transmission constant setting means having a DC power source is connected, the auxiliary power supply terminal connected to the DC power supply output terminal of the transmission constant setting means, and the transmission constant input terminal A constant storage circuit for storing the input transmission constant, a control circuit for processing the output of a transmission pulse signal for each predetermined weighing value in accordance with the transmission constant stored in the constant storage circuit, and the auxiliary power supply terminal. When the watt-hour meter is not supplied with commercial-frequency power, the power supply circuit that receives the DC power supply is provided, so that the DC power supply output terminal of the external transmission constant setting means is connected to the auxiliary power supply terminal of the watt-hour meter. Since the DC power for operation is supplied to the transmitter via the power supply, even if the commercial frequency power is not supplied to the transmitter-equipped watt-hour meter, the watt-hour meter transmission constant data It can be written.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmitter including an external transmitter constant setting means transmitter of a power meter with a transmitter according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a transmitter of the watt-hour meter with a transmitter including an external transmission constant setting means.

FIG. 3 is a diagram showing a connection between an external transmission constant setting means and an electric energy meter of the electric energy meter with the transmitter.

FIG. 4 is a block diagram of an external transmission constant setting means of the electric energy meter with a transmission device.

[Explanation of symbols]

1 Optical Coupling Element Circuit 2 Transmission Device 3 Central Control Circuit 4 Transmission Pulse Output Circuit 5 Transmission Constant Input / Output Circuit 6 Constant Storage Circuit 7 Crystal Oscillation Circuit 8 Power Failure Detection Circuit 9 Protection Circuit 10 Voltage Divider 11 Rectifier Circuit 12 Constant Voltage Circuit 13 Transmission constant setting means 14 Control circuit 15 DC power supply 16 Modular cable 17 Personal computer 18 Writing device 19 Electricity meter 20 Interface 21 I / O 22 DC power supply 23 Transmission constant setting device 24 Numeric keypad 25 Indicator 26 Microcomputer 27 I / O 28 DC power supply 29 Reverse flow blocking diode 30 Reverse flow blocking diode t Transmission constant input terminal X Auxiliary power supply terminal S Data output terminal Q DC power supply output terminal C1, C2, C3, C4, C5, C6, C7, C8, C
9 Capacitor CN Connector CONT Control Circuit D Backflow Prevention Diode D1, D2, D3 Diode IC1, IC2, IC3, IC4 Semiconductor Integrated Circuit J Jumper Wire L Filter Coil O1, O2 Output Terminal P1, P2 Power Supply Terminal PI1, PI2 Optical Coupling Element PW DC power supply Q1, Q2 Transistors R1, R2, R3, R4, R5, R6, R7, R8 Resistance RY Relay SA Surge absorber XTAL Crystal oscillator ZD Zener diode

Continuation of the front page (56) Reference JP 59-180368 (JP, A) JP 55-147354 (JP, A) JP 63-238468 (JP, A) Actual development JP 62-20377 (JP , U) Actually open 54-148156 (JP, U) Actually open 6-33079 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A two-phase signal is generated by rotation of a rotor of a watt-hour meter, the two-phase signal is counted as a measured value, and a transmission pulse signal is output for each predetermined measured value according to a set predetermined transmission constant. In a watt-hour meter with a transmitter, a transmission constant input terminal to which a data output terminal of an external transmission constant setting means having a DC power source is connected, and an auxiliary power source connected to a DC power supply output terminal of the transmission constant setting means A terminal, a constant storage circuit that stores the transmission constant input from the transmission constant input terminal, and a control circuit that processes the output of the transmission pulse signal for each of the predetermined measured values according to the transmission constant stored in the constant storage circuit. And a power supply circuit for receiving a DC power supply supplied from the auxiliary power supply terminal. 2. The oscillation constant input terminal is connected to a data output terminal of an oscillation constant setting means for setting, calculating, and outputting an oscillation constant, and the auxiliary power source terminal supplies a DC power source to the outside. The watt hour meter with a transmitter according to claim 1, wherein a DC power output terminal of the setting means is connected.