KR100443825B1 - Electronic watt-hour meter that having perceiving function of surreptitious use of electricity - Google Patents

Abstract

PURPOSE: An electronic watt-hour meter that having perceiving function of surreptitious use of electricity is provided to prevent power loss due to the surreptitious use of electricity of an electric power company or leakage. CONSTITUTION: An image current transformer(3) is installed on a low voltage power line(1) to detect a leakage current and is connected to a leakage current/surreptitious use of electricity detector of a signal detection unit(10). A current transformer(2) is connected to a current detector of the signal detection unit. The signal detection unit detects electric signals from the current transformer and the image current transformer. A controller(20) includes an A/D conversion unit converting signals from the signal detection unit into digital signals, and a calculation and memory unit calculating and storing converted data, and a serial communication interface. A micro processor unit(40) controls a system with an embedded data communication program, and controls to display data by being connected to a display unit(50). The display unit displays data to the external. And a power line communication modem unit(30) transmits and receives a transmission command and the stored data through the low voltage power line by power line communication.

Description

Electronic watt-hour meter that having perceiving function of surreptitious use of electricity}

The present invention is an electronic watt-hour meter installed in a consumer, usually displays data on various meter readings, and transmits the data to a remote location by using a built-in power line communication modem, if a challenge occurs, using a video current transformer The present invention relates to an electronic electricity meter having a conduction detection function that detects a signal and transmits data about a challenge to a remote site through a powerline communication modem.

Typically, the electricity supplier installs a electricity meter in the customer's building, connects the wires and completes the installation of the instrument.

However, in spite of such sealing, some electric users are unjustly inadequate by removing the sealing of the electricity meter terminal cover installed in the customer, opening the terminal cover and changing the wiring or not connecting any wires. The occasional use of electricity has led to disputes over electricity rates between utilities and customers.

As a method of verifying the above-mentioned challenge, when the meter of the electricity supplier periodically reads the electricity meter, it was checked visually whether the seal was damaged and judged whether there was any trace of the challenge.

However, in such a case, a seal similar to a seal installed by a conventional electricity supplier may be used to subtly hide traces of challenge.

Therefore, in order to solve the above problems, an electronic wattmeter having an anti-conduction device as shown in FIG. 1 has been proposed.

The configuration and operation of the electronic wattmeter provided with the anti-conduction device will be described in detail with reference to FIG. 1 as follows.

The electronic watt-hour meter detects the presence or absence of the terminal cover, generates an alarm to notify the user when the terminal cover is open, records the data indicating the challenge in the memory, and indicates the challenge to the remote site by using a telecommunication device. Send it.

The electronic electricity meter is largely comprised of a power circuit unit 120, a power / frequency conversion unit 130, a digital circuit unit 140, an external output unit 150.

The power circuit unit 120 includes a power transformer 121, a power circuit 122, and an electrostatic compensator 123, and rectifies AC voltages output from the power transformer 121 to rectify various kinds of voltages. It converts into direct current (DC) power for driving an electronic circuit and supplies the direct current power to each electronic circuit.

The power / frequency converter 130 includes a voltage signal converter 131, a current signal converter 132, a multiplier 133, and a frequency converter 134. Detects the voltage and the current through the multiplier 133 and the frequency converter 134 and converts it into an electrical signal that can be used in the central processing unit 141.

The digital circuit 140 includes a central processing unit 141, an oscillating circuit 142, an EEPROM 143, a key input unit 144, a power monitoring circuit 145, and an external communication unit 146. ) And the conductive sensing unit 147, and outputs an alarm indicating the challenge to the external output unit 150 when an opening of the terminal cover is detected through the conductive sensing unit 147. Control of the operation of recording to the remote control, an operation of remotely transmitting an alarm indicating the challenge, and the like.

The external output unit 150 includes a liquid crystal display (LCD) 151, an alarm indicator 152, and a buzzer generator 153. The external output unit 150 is controlled by the central processing unit 141. It displays the operation status and metering data of the electricity meter and outputs an alarm indication to the outside when the opening of the terminal cover is detected.

However, the electronic watt-hour meter is connected to a wired or wireless communication network by communication devices such as a LAN card or a wireless communication terminal used by an external communication unit 146 for transmitting various meter reading data to a remote place in addition to a power facility. Since the transmission, the installation of communication lines for communication devices is inevitable, and the installation cost of the communication lines is excessively consumed, making it difficult to be practical.

In addition, when the data indicating the challenge is stored in the memory because of the problems described above, when the meter reader periodically reads the electricity meter, it checks the stored data to determine whether there is a challenge, the waste of manpower and cost of the power company There is this.

In particular, since it is judged that the sensing of the conductor is merely the opening of the terminal cover, there is a problem that the determination can be determined even if the terminal cover is opened due to an accident or natural disaster.

Accordingly, the present invention has been proposed to solve the problems of the prior art described above, and it is possible to reinforce the function of the electronic wattmeter which includes a power line communication modem and use electricity in an illegal manner such as a challenge. An object of the present invention is to provide an electronic electricity meter that detects and notifies a remote power company.

In particular, the present invention is further provided with an image converter in an electronic wattmeter, which has a built-in power line communication modem, can be easily installed and used, and is characterized by low additional cost.

In addition, the present invention improves the economics and safety of the power supply by reducing the line management cost of the power company and the prevention of transformer accidents, and by detecting the location of the accident in real time in real time, mutual reliability between the power supply company and the customer It is to provide a device for improving the.

1 is a block diagram of an electronic wattmeter having a conventional anti-conduction device.

Figure 2 is a block diagram of an electronic power meter capable of detecting a challenge with a built-in power line communication modem to which the present invention is applied.

※ Explanation of code about main part of drawing ※

1: low voltage power line 2: current transformer

3: video current transformer 4: switching power unit

10: signal detector 11: leakage / conduction detector

12 current detector 13 voltage detector

14 zero cross detector 20 control unit

21: A / D converter 22: operation and memory

23: central processing unit 24: serial communication interface

30: power line communication modem unit 31: line coupler

32: power amplifier 33: carrier amplifier

34: Carrier Controller 35: Filter and Amplifier

40: microprocessor unit 41: central processing unit

42 carrier oscillator 43 serial communication interface

50: display unit 51: LCD driver

52 LCD display 120 power circuit

130: power / frequency converter 140: digital circuit

150: external output unit

In order to solve the above technical problem, the present invention provides an electronic wattmeter with a built-in power line communication modem, and the integrated meter reading data is transmitted to the supplier through regular checks, and a challenge is detected using an image current transformer. In this case, the present invention relates to an electronic wattmeter having a conduction detection function for quickly responding by transmitting data representing a challenge to a remote place.

The present invention is installed on a low-voltage power line to detect the leakage current and connected to the leakage / conduction detector of the signal detection unit, a current transformer is installed on the low-voltage power line and connected to the current detector of the signal detection unit, the current transformer and the image transformer A signal detector which detects various electrical signals from the digital camera, a control unit connected to a microprocessor unit and a serial communication interface by converting the signal value output from the signal detector into a digital signal, calculating, calculating and storing the converted data; And a microprocessor unit for bidirectionally communicating with the control unit and a data communication program for data communication to control a system and to display data in connection with a display unit, and externally process data processed by the microprocessor unit. Display and display on It is configured for sending a command and the stored data in the data collection portion shorthand power line communication modem for receiving and transmitting a power line communication through the power line to the low pressure characterized.

In particular, the core of the present invention is to install a video current transformer in a low-voltage power line to detect the electrical signal flowing to the video current transformer, convert and calculate it into a digital signal, to store and transmit the calculated data, and to remotely And a power line communication modem for transmitting data.

The current transformer accurately detects a very small leakage current, and in a state in which there is no short circuit or conduction in the low voltage power line, the current flowing through the current transformer and the return current are the same. Since there is a difference in the current flowing through it, and the magnetic flux is generated in the image current transformer by the current difference, the image current transformer sees that a conduction or a short circuit has occurred at this time, and sends a signal to the earth leakage / conduction detector.

According to the present invention, a signal required by a power meter is detected using a signal detector, and then the signal detected by the signal detector is input to an A / D converter of the controller, converted into a digital signal, and then calculated through the serial communication interface of the controller. The memory unit calculates and calculates and stores the operation data of the low voltage power line and the transformer using the received signals.

In this case, the calculated data includes the magnitude and rate of change of the current flowing through the image current transformer, the amount of power and the duration.

The data calculated by the operation and memory unit is transmitted to the central processing unit of the microprocessor unit through the serial communication interface, and the microprocessor unit transmits the data to the display unit, and also makes data suitable for data communication to the power line communication modem unit. do.

The display unit displays data so that the state of the electricity meter can be recognized from the outside, and the power line communication modem unit is configured to transmit data received from the microprocessor unit by a transmission command of the upper data concentrator. .

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention configured and operated as described above are as follows.

FIG. 2 is a block diagram of an electronic power meter capable of detecting a conductivity to which the present invention is applied.

The present invention includes a current transformer 2 and an image current transformer 3 installed on the low voltage power line 1 to measure a signal, a signal detector 10 to detect a signal measured on the low voltage power line, and the signal detector 10. A control unit 20 for calculating, storing, and reading the meter reading data and the data generated by leakage / challenge by transmitting the signal value outputted from the control unit; and sending commands to the microprocessor unit 40; The power line communication modem unit 30 and the power line communication modem unit 30 and the control unit 20 transmit and receive data to and from the power line communication through the low voltage power line 1 so as to exchange data with each other. A microprocessor unit 40 connected to the microprocessor unit 40 having a built-in communication program for data communication by processing integrated meter reading data and other data, and connected to the microprocessor unit 40 It is composed of a display unit 50 for display to confirm the meter data in the unit.

The low voltage power line 1 is provided with a current transformer 2 for measuring a current and an image current transformer 3 for detecting a change in the value of the current due to a short circuit and a conduction.

The signal detector 10 includes a current detector 12 for detecting a current from the current transformer 2, a voltage detector 13 for detecting a voltage in the low voltage power line 1, and a short circuit from the image current transformer 3. And a leakage / conduction detector 11 for detecting a signal that a conduction is occurring, and a zero cross detector 14 connected to a low voltage power line and detecting a zero cross point by detecting a phase difference between a voltage and a current.

The control unit 20 and the A / D conversion unit 21 for converting the analog signal output from the signal detector 10 into a digital signal that can be used in the serial communication interface 24 and the calculation and memory unit 22 and And a serial communication interface 24 for transmitting data between the A / D converter 21 and the calculation and memory unit 22, and an operation of calculating, calculating and storing operating data of the transformer by calculating an input digital signal. And a memory unit 22 and a serial communication interface 24 which is a communication port for transmitting these data.

The A / D conversion unit 21 and the operation and memory unit 22 are bundled to form a central processing unit 23 of the control unit 20.

The microprocessor unit 40 includes a carrier oscillator 42 generating a synchronization signal for transmitting various types of information to the power line communication modem unit 30, and a data communication program for data communication. And a central processing unit 41 for driving the LCD driving unit 51 to output various information from the display unit 50 to the outside, and communicating with the control unit 20 in both directions, and transmitting data to the central processing unit 41. It consists of a serial communication interface 43 to play a role.

The power line communication modem unit 30 is a carrier controller 34 and a carrier amplifier 33 for controlling and transmitting various metering data output on the oscillation frequency of the carrier oscillator 42 of the microprocessor unit 40. Power amplifier 32 to amplify the carrier signal output from the power transmission line to the line coupler 31 connected to the low-voltage power line 1, and receives from a data concentrator (not shown) connected to the low-voltage power line (1) The control signal is configured to be transmitted to the serial communication interface 43 of the microprocessor unit 40 through the line coupler 31, the filter and the amplifier 35.

The display unit 50 is operated by the LCD driver 51 and the LCD driver 51 operating by receiving a drive signal from the microprocessor unit 40 so that the external state of the electricity meter can be known from the outside. LCD display unit 52 that outputs.

Referring to the operation of the electronic wattmeter with a conductive sensing function using the above-configured device as follows.

The electrical signals generated from the current transformer 2 and the image current transformer 3 installed in the low voltage power line 1 supplied to the customer are input to the detectors 11, 12, 13, 14 corresponding to the signals. The analog signal output through the detection unit is input to the A / D conversion unit 21 of the central processing unit 23 of the control unit 20, converted into a digital signal, and then the serial communication interface of the control unit 20. It is transferred to the operation unit of the control unit 20 and the memory unit 22 via the operation 24, and the operation unit and the memory unit 22 perform calculations such as the previous month's instructions, the present guidelines, the effective power amount, the reactive power amount, the power factor, and the like by the set program. After the process, the calculated data is stored, and the stored data is transmitted to the micro processor 40 through the serial communication interface 24.

The data calculated by the calculation and memory unit 22 is not only the reading data such as voltage, current and the month and month reading, the current guide, and the operating data of the transformer such as voltage, current, power factor, abnormal voltage, etc. The data includes data on the magnitude and rate of change of the current flowing from the image current transformer 3 to the image, the amount of power and the duration.

In addition, when a ground fault occurs, the magnitude of each image current detected from an adjacent wattmeter may be compared to detect an accident occurrence location.

The data stored in the operation and memory unit 22 of the control unit 20 is transmitted to the microprocessor unit 40 and combined with the unique number of the facility, the data including the unique number of the facility is a low-voltage power line The transmission command transmitted from a data concentrator (not shown) connected to the furnace 1 transmits to the remote place through the power line communication modem unit 30.

In addition, the microprocessor unit 40 operates to drive the LCD driver 51 to display the data received from the controller 20 on the LCD display device 50.

In the process of transmitting data by the power line communication modem unit 30, when a command for transmitting data stored in the microprocessor unit 40 is received from a data concentrator (not shown) connected to the low voltage power line 1, the power line communication modem unit 30 receives the data. As power line communication is performed between the data concentrator (not shown) and the electronic electricity meter, the transmission command is received by the line coupler 31 of the power line communication modem unit 30 through the low voltage power line 1 to the transmission command. Only the corresponding communication signal is extracted, and the extracted communication signal passes through the filter and the amplifier 35 to filter only a specific frequency band, and to co-amplify and filter the filtered signal. The serial communication interface 43 of the microprocessor unit 40 is extracted. ), And the received transmission command is transmitted to the CPU 41.

When the data transmission command is received from the power line communication modem unit 30, the data stored by the program set in the central processing unit 41 of the microprocessor unit 40 is transmitted.

As the data is applied to the carrier controller 34 of the power line communication modem unit 30, data information is loaded on the carrier signal generated by the carrier oscillator 42, and the signal is output to the carrier amplifier 33. The voltage and power amplification are performed through the power amplifier 32 and then transmitted to the low voltage power line 1 through the line coupler 31, and the data information transmitted through the low voltage power line 1 is a power line communication. It is transmitted to a data collector (not shown).

As described above, the present invention is provided with an image current transformer in addition to the electronic wattmeter embedded with a conventional power line communication modem to detect the use of electrical power, such as conduction or short-circuit to prevent power loss due to the challenge of the utility company It works.

In addition, the present invention can be used to determine the presence of integrated meter reading and challenge or short-circuit by transmitting a variety of data to a remote site using a power line communication modem without the meter reader of the utility company visits the customer periodically and read the meter Therefore, there is an effect that can reduce the manpower and cost of the utility company.

In particular, the present invention can reduce the line management cost of the power company, prevent the transformer accident, the location of the accident, such as the accident location information can reduce the dispute caused by the power bill between the power company and the customer, the effect of improving the trust You can expect.

Claims (3)

An image transformer installed in the low voltage power line to detect a leakage current and connected to an earth leakage / conduction detector of the signal detector; a current transformer installed in the low voltage power line and connected to the current detector of the signal detector; A signal detector which detects various electrical signals from the current transformer and the image current transformer; An A / D converter for converting the signal value output from the signal detector into a digital signal, an arithmetic and memory unit for calculating, calculating and storing the converted data, and a controller including a serial communication interface; A microprocessor unit which bidirectionally communicates with the control unit and includes a data communication program for data communication to control a system, and to connect to a display unit to display data; A display unit which displays data processed by the microprocessor unit to the outside; An electric power meter having a conduction detection function comprising a power line communication modem unit for transmitting and receiving a command of an upper data concentrator and the stored data in power line communication through a low voltage power line. The method of claim 1, The microprocessor unit includes a central processing unit which drives an LCD driving unit for displaying data and controls a system by incorporating a program for data communication; A carrier oscillator for generating a synchronization signal for transmitting information transmitted from the power line communication modem unit; Electronic electricity meter with a conductivity detection function, characterized in that consisting of a serial communication interface that can exchange data with the control unit. The apparatus of claim 1 or 2, wherein the power line communication modem unit comprises: a carrier controller for controlling and transmitting various data; A carrier amplifier using the output of the carrier controller as an input signal; A power amplifier for amplifying a carrier signal output from the carrier amplifier and transmitting the power to a line coupler connected to the low voltage power line; A line coupler for receiving a control signal from a data concentrator connected to the low voltage power line; An electronic power meter having a conduction sensing function comprising a filter and an amplifier receiving an output signal of a line coupler and transmitting the serial signal to a serial communication interface of a microprocessor unit.