KR20060083367A - Multi function data gathering device of automatic meter reading system - Google Patents

Abstract

The present invention relates to a data collection device of a remote meter reading system, comprising: a three-phase voltage current sensor unit for measuring voltage and current of a transformer secondary side; A power line communication modem unit which transmits data on power consumption measured by an electronic electricity meter; An input / output interface unit controlling data flow with a remote meter reading control server; A central processing unit for processing the collected data into predetermined data and monitoring a state of supply of electricity to a transformer and each customer; And a memory unit for temporarily storing the data.

Data Acquisition Device, Remote Metering Device, HFC

Description

Multi Function Data Gathering Device of Automatic Meter Reading System             

1 is a block diagram of a remote meter reading system according to an embodiment of the present invention.

2 is a block diagram of a data collection device according to an embodiment of the present invention.

3 is a configuration diagram showing a state in which the meter reading pro part is provided in the columnar transformer according to an embodiment of the present invention.

4 is an exploded view of a pro part according to an embodiment of the present invention.

{Description of symbols for main parts of the drawing}

201: clock 202: reset

203: central processing unit 204: RS-232C driver

205, 206: interface 207: status display

208: DIP switch unit 209: external display unit

210: memory 211: backup battery

212: input and output interface unit 213: signal level conversion unit

214: server communication unit 215: three-phase voltage current sensor

216: protection circuit 217: voltage and current transformer

218: analog-to-digital converter 219: N-phase connector

220: internal power supply unit 221: PLC modem unit

The present invention relates to a data collection device of a remote meter reading system, and in particular, it is possible to know the power quality state of electricity used in each household based on this by acquiring various metering data of the electronic wattmeter installed in each household. The present invention relates to a multifunctional data collection device capable of managing power state of a transformer capable of monitoring overload.

In general, a remote meter reading system or a telemetry system or an automatic meter reading system (AMR) is a method of converting a measurement result into an electrical signal from a distant object and transmitting data through a communication network. The processing of data on a computer. Remote meter reading is being developed as a new information and communication service with the development of communication technology, sensing technology, and computer technology, and recently, it is widely used in pollution monitoring, crime prevention, disaster prevention, power, water supply, and gas system.

These remote meter reading systems are classified into a wireless method without a communication line and a wired method with a communication line according to the communication method used. Wired type is classified into power line type, CATV cable type, dedicated line type and telephone line type according to the type of communication line used.

Among the wired methods, the power line method is a method using power line communication (PLC), which uses a power line used to supply electricity to a home, a factory, and an office in a power company as a signal transmission line. .

Power line communication is a method of communicating data through a power line using a commercial AC signal as a transmission medium. Since a sinusoidal wave of 60 Hz, which is a commercial AC power source, and a communication signal (for example, several tens of KHz) are multiplexed and transmitted simultaneously, power is supplied through a power line. Wherever this is available, communication is possible.

The remote meter reading / control server and a plurality of data collection devices through a data communication network (eg, a backbone network, a private network, and an Internet network) provided to perform data communication based on a Transmission Control Protocol / Internet Protocol (TCP / IP). Interconnected. The remote meter reading / control server performs data transmission and reception with a data collection device in real time through a data communication network, and thus, it is possible to monitor the power state of each consumer in real time.

In addition, the remote meter reading / control server receives the real-time meter reading data of each consumer from the data collection device. Based on the meter reading data, the power state of each customer, such as power failure, idle (vacant house), challenge, and leakage state, is analyzed and provided to the manager. Here, the meter reading data may be the sum of the amount of power used per month, weekly, night, date, and time of every customer assigned to one data centralization device, the amount of power used by each customer, and the instantaneous power. In addition, all data can be included to determine the power quality of each consumer.

However, the data collecting device of the conventional remote meter reading system was a system that only reads the amount of power of each customer and then sends the metered data to the data collector at a high speed and transmits it to the remote metering server using a cable network. Therefore, there was no way to detect anomalies of cables and transformers coming into the track or home.

Disclosure of Invention An object of the present invention is to solve the above problems, and to provide a data collection device capable of acquiring information such as efficient over-the-counter use including remote metering and failure information acquisition of low voltage lines, and transformer overload. have.

The data collection device of the remote meter reading system of the present invention comprises a three-phase voltage current sensor unit for measuring the voltage and current applied to the transformer; A power line communication modem unit for transmitting data on power consumption measured by an electronic electricity meter, and an input / output interface unit for controlling data flow with a remote metering control server; A central processing unit for processing the collected data into predetermined data and monitoring a state of supply of electricity to a transformer and each customer; And a memory unit for temporarily storing the data.

In the present invention, the CPU further includes a clock for operating the CPU and a reset unit for initializing the CPU.

In the present invention, it is preferable to further include a status display unit for displaying the status of the data collection device.

In the present invention, it is preferable that the status display unit further includes a light emitting device for visually recognizing the state of the data collecting device from outside and a dip switch for recognizing a device number of the data collecting device.

In the present invention, the central processing unit further comprises a serial communication unit for communicating with a device for upgrading the firmware (firmware) and the like from the outside.

In the present invention, the memory unit is preferably powered by a backup battery.

In the present invention, the input / output interface unit preferably further includes a signal level converting unit for changing the signal transmitted from the remote metering control server to match the signal level in the data collection device.

In the present invention, the voltage and current values input from the three-phase voltage and current sensor unit are dropped to a predetermined voltage and current value by a voltage and current transformer, and digitally processed by an analog-digital converter.

In the present invention, it is preferable to further include an internal power supply for converting the current applied to the three-phase voltage current sensor to an internal power source.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

1 is a block diagram of a remote meter reading system equipped with a data collection device according to an embodiment of the present invention.

In the above embodiment, the data collecting device 105 schematically shows the position where the data collecting device 105 is installed on the electric pole 103 and how the data collecting device 105 is connected to each communication module.

Referring to FIG. 1, the electronic wattmeter 108 provided at each customer 107 reads the amount of power used by each customer 107, and uses a PLC modem using a power line connected to each customer 107. By using a wired communication method through 201) or a wireless communication method using an RF modem, data about the amount of power is transmitted to the data collection device 105 provided in each transformer.

The data collecting device 105 not only functions to transmit various meter reading data of the electronic electricity meter 108 installed in each home to the upper system, but also obtains the transformer state data per displacement, and compares it with the measurement information of the electronic electricity meter 108. Based on the analysis, it is possible to know the power quality status of electricity used in each household and to manage the power status per transformer.

The data collection device is a hybrid fiber coax (hereinafter referred to as 'HFC') for low-voltage line operation, overload condition and failure information as well as transmission of meter reading data as a main function for efficient system operation. It transmits it to the meter reading server, and it has the self-diagnosis function of the system. It monitors the power status of each customer and transmits the customer power status information to the operation system server.

In addition, the rapid increase in power demand due to the rapid increase in devices such as cooling equipment and information equipment with high power consumption may lead to problems such as power demand prediction and voltage management for each transformer, and to detect abnormal conditions in which the transformer burns out due to overload. Power efficiency is applied to power management system by using power measuring device per transformer and various sensors (temperature sensor, transformer vibration sensor, etc.).

The data collection device measures the three-phase voltage and current applied from the transformer, and communicates with the PLC modem connected to the electronic electricity meter of each home.

2 is a block diagram of a data collection device according to an embodiment of the present invention.

In the above embodiment, the data collection device is largely divided into a central processing unit 203, a status display unit 207, a memory unit 210, an external input / output interface unit 212, a three-phase voltage current sensor 215 and analog-digital conversion. Part 218 is included.

The embodiment schematically shows each component of the data collection device.

Referring to FIG. 2, the electricity applied from the columnar transformer is input to the three-phase voltage current sensor 215. The three-phase voltage and current sensor 215 is a place where the voltage and current of the three-phase electricity is input, it is preferable to measure each of the A phase, B phase, C phase.

Since the input voltage and current are very large, they may affect the circuit. Therefore, it is preferable to be input through the protection circuit 216 rather than being directly input. The protection circuit 216 changes the voltage applied from the column transformer to an abnormal voltage and effectively blocks noise such as surge and burst.

The method of measuring the three-phase voltage and current in the column transformer is based on the method as shown in FIG. 3, which is a data collection device according to an embodiment of the present invention to check the voltage and current state of the column transformer It shows schematically how to do it.

Referring to FIG. 3, the data collection device reads voltage and current of each phase by using a meter reading pro. The detailed structure of the meter reading pro part is shown in FIG. 4. Details of the pro part are determined to depart from the gist of the present invention, and thus description of the details will be omitted.

The three-phase voltage and current passing through the protection circuit 216 are input to the voltage transformer and the current transformer 217, respectively. The transformer is a device for converting a high voltage and a high current which cannot be directly measured into a voltage and a current which is easy to measure, and is necessary for measuring a high voltage and a high current. The basic structure of all of these is like a transformer. In general, the voltage and current to be converted are set to 110 V in the instrument transformer and 1 A or 5 A in the current transformer so as to be easy to measure. However, in the present invention, the value is preferably set within 0 to 200 mV.

The voltage and current values dropped by the voltage and current transformer 217 are changed into digital values by the analog-digital converter 218.

The changed digital value is temporarily stored in the memory unit 210 for processing into predetermined data. The memory unit 210 may be formed of a combination of a ROM and a RAM. The memory may be variously implemented according to the level of those skilled in the art, but in the present invention, it is preferable to use EEPROM and SRAM.

Data stored in the memory unit 210 is moved to the central processing unit 203 to be processed into predetermined data. The central processing unit 203 converts various data of electric power currently supplied to a transformer and a home, and a predetermined clock 201 is provided for synchronized operation, and a reset 202 is provided for resetting the system. do. The clock frequency is preferably 25Mhz.

The central processing unit 203 may be provided with a module 204 for predetermined serial communication. The module 204 for serial communication is to upgrade firmware or software inside the system, and the present invention uses RS-232C. Of course, it is obvious that it is not limited to said structure.

The CPU 203 is connected to the external input / output interface 212. The external input / output interface unit 212 is connected to an external communication module to enable the transmission and reception of data with the outside. The input / output interface unit is provided with two channels, one channel for data communication with a remote meter reading control server, and the other channel for transmitting and receiving data with a PLC modem unit communicating with a home electricity meter.

The central processing unit 203 monitors the state of the transformer by using the data collected from each communication module and the data read by the measurement to efficiently operate the data processing line, acquire fault information of the low voltage line, and acquire overload information. do.

The server communication unit 214 is connected to the remote metering control server and transmits and receives the result of the metered data and the processed data to the remote metering control server. The transmitted data is provided to the administrator of the remote meter reading system and used for control of each system.

The external input / output interface unit 212 is connected to a PLC modem unit 221, which includes a three-phase coupler and a PLC communication module (not shown). The three-phase coupler multiplexes three-phase electricity input from a transformer into a single signal and transmits it to each customer through a PLC communication module, and the PLC communication module receives data transmitted from an electronic electricity meter installed in a home.

An internal power supply unit 22 is connected to one of each of the input phases. The internal power supply unit 220 changes the input AC current into a DC current and uses the internal power supply of the data reading device. The internal power supply is preferably about 5V.

A signal level converter 213 for converting a signal into a predetermined value is preferably provided between the server communication unit 214 and the input / output interface 212.

The CPU 203 is connected to the status display unit 207. The status display unit 207 is a device for displaying the status of each phase of the PLC, ADC, HFC, transformer, the external display 209 for visual display to the outside and the dip switch 208 for setting the address of the device Is provided. The external display unit 209 is preferably made of a light emitting element.

The light emitting device is preferably provided according to the number of states desired to know, but in the present invention, the transmission and reception details of data through the PLC modem unit, the connection status and data transmission and reception details of the server through the HFC, whether to initialize the system, the power state It is desirable to obtain a light emitting device that indicates whether data is transmitted or received while the device and firmware are being downloaded.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

As described above, according to the present invention, a meter having a data collection device as well as a function of remotely reading the metering data of each customer's electronic electricity meter through a power line communication modem and transmitting the metering data to the metering server using the HFC network. In order to monitor the abnormal condition of the main transformer, the transformer's usage information data can be transmitted to the remote metering server, so that information such as efficient loading and failure information of low voltage line and overload can be obtained.

Claims (9)

Three-phase voltage current sensor unit for measuring the voltage and current applied to the transformer; An input / output interface unit for controlling data flow between a power line communication modem unit and a remote metering control server for transmitting data on power consumption of a consumer measured in an electronic electricity meter; A central processing unit for processing the collected data into predetermined data and monitoring a state of supply of electricity to a transformer and each customer; And a memory unit for temporarily storing the data. The apparatus of claim 1, wherein the central processing unit further comprises a clock for operating the central processing unit and a reset unit for initializing the central processing unit. The apparatus of claim 1, further comprising a status display unit for displaying a status of the data collection device. The remote meter reading system of claim 3, wherein the status display unit further comprises a light emitting device for visually recognizing a state of the data collecting device and a dip switch for recognizing a device number of the data collecting device. Data collection device. The apparatus of claim 1, wherein the central processing unit further comprises a serial communication unit for communicating with an apparatus for upgrading firmware in the data collecting unit from the outside. The data collection apparatus of claim 1, wherein the memory unit is powered by a backup battery. The apparatus of claim 1, wherein the input / output interface unit further comprises a signal level converting unit configured to change a signal transmitted from a remote meter reading control server to match a signal level inside the data collecting device. . According to claim 1, wherein the voltage and current values input from the three-phase voltage and current sensor unit is lowered to a predetermined voltage and current value by the voltage and current transformer, the digital data is processed by the analog-to-digital conversion unit A data collection device for a remote meter reading system. The data collection apparatus of claim 1, further comprising an internal power supply configured to digitally convert current applied to the three-phase voltage current sensor to an internal power source.

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