KR20010020018A - A system for collecting and transmitting a fault information of a power system - Google Patents

Abstract

PURPOSE: A system for collecting and transmitting an information and a data for a power system is provided to store and store an information about a fault by various digital guarding relays and a fault recording device and to enable an electric company or an electric management center to monitor or to analysis the information. CONSTITUTION: In a system(310) for collecting/transmitting a data, multiple digital relays(301-303) and a fault recording device(304) installed in a substation are connected in serial to multiple serial communication end-connection parts(311-314) which are connected to a main control part(316) through a data bus(315). A data about a fault transmitted from the multiple relays and the fault recording device is sent to the main control part(316) which controls the multiple digital relays and the fault recording device(301-304), and a remote communication connection part(318) connected to the main control part(316) and a modem(340). The data is also stored in a memory part(317) connected to the main control part(316) and transmitted to an electric company or an electric management center through the remote communication connection part(318) and the modem(340) to enable the company or the center to monitor the fault based on the transmitted data.

Description

A system for collecting and transmitting a fault information of a power system

The present invention relates to a state information collection and data transmission system of a power system, and more specifically, fault information of a power system is collected through various types of digital protection relays and fault recording devices installed in each substation. The present invention relates to a power system state information collection and data transmission system that stores and stores and transmits the collected fault information to a higher power company or a power management center for monitoring and analysis.

In general, in the substations 10a, 10b, 10c, and 10d, which are in charge of controlling and protecting the power transmission system of the electric power company, as shown in FIG. Digital Protection Relay (13) to cut off the circuit and Fault Recorder (14) to record and store necessary data before and after faults in each power system. It is provided on the power system transmission line 12 of the liver.

In particular, since the digital protective relay 13 internally stores information such as the operation status of the relay associated with the failure, the task of quickly collecting, identifying, and analyzing the stored information is to prevent accidents and recover from damage caused by the power system. This is a very important task.

However, digital protection relays and fault recording devices installed in power plants and / or substations of electric power companies are various, and are manufactured by different manufacturers and supplied to each substation for communication connection for transmitting fault data. Since the method and transmission method is different for each product, it is a situation to collect failure data by securing a separate communication transmission line for each type.

Due to the lack of a standardized interface for transmitting and receiving data, it is cumbersome to manually collect and acquire fault information of substation units one by one in the remote host system in the event of a fault in the power system, and even individual communication transmission lines From the unobtained digital protection relay and fault recorder, there was a need to collect fault data remotely and collect it on site.

2 illustrates an example of a state information collection and data transmission system of a conventional power system, and different types of digital protection relays 21, 22, and 23 installed in a substation 20 and a fault recording device ( 24); A plurality of modems (21a, 22a, 23a, 24a) respectively installed in the digital protective relays (21, 22, 23) and the fault recording device (24) so as to meet the communication connection specifications of the respective models; A remote failure analysis personal computer (25) installed at a remote location from the substation (20) to acquire and analyze various failure information of the power system from the digital protection relays (21, 22, 23) and the failure recording device (24); Telephone switching network for communication connection between the modem 25a of the personal computer device 25, the digital protective relays 21, 22, 23, and the modems 21a, 22a, 23a, 24a of the fault recording device 24, or It consists of the dedicated communication network 26.

As described above, the digital protection relays 21, 22, and 23 and the fault recording devices (hereinafter, referred to as “field devices”) 24 installed and operated in the substation 20 of the power company are separately communicated by models. Since it has a transmission / reception connection specification, it communicates with the upper personal computer 25 through the corresponding modems 21a, 22a, 23a, 24a and the communication network 26 installed according to each model. The upper personal computer 25b should be provided with software for monitoring and interpreting the data transmitted from the field devices 21 to 24. Since the software is different for each manufacturer, the field devices 21 to 24 are different. ) Must have all software provided by the manufacturer.

The personal computer 25b monitors or analyzes data transmitted from each field apparatus 21 to 24 using software of each manufacturer. Therefore, the remote upper control office is provided with a personal computer 25b and a modem 25a to operate the personal computer 25b and then refer to a desired field device among the plurality of lower field devices 21 to 24, for example. By executing the software corresponding to the number 21 digital protection relay and selecting the corresponding menu, data is acquired through the modem 21a, the communication network 26, and the modem 25a. The personal computer 25b monitors or analyzes the obtained data according to a predetermined menu using a corresponding analysis software.

Subsequently, when the personal computer 25b is to obtain data by accessing another type of field device installed in the same substation 20, for example, a digital protective relay of reference numeral 22, the previous software is terminated. The software corresponding to the digital protection relay 22 is executed to acquire data through the modem 22a, the communication network 26, and the modem 25a as described above, and monitor or analyze the obtained data.

On the other hand, when the digital protective relays are selected by the same communication connection specifications of the same manufacturer and installed in the substation unit, by connecting each installed digital protective relay to the mutual communication network and concentrating the data, the data is transferred to the upper level through one modem. Although it is possible to transmit to the personal computer device 25, the digital protective relay manufacturers do not manufacture a failure recording device, and also because the current replacement and / or new work of each field device cannot always be uniform, the field device of the substation unit It is very difficult to replace them and / or install new ones with the same model of the same company.

The present invention was created to solve the above problems, the object of which is composed of a single device, and collects and stores the fault information of the power system from different types of digital protection relay and fault recording device of different types, the collection The purpose of the present invention is to provide a system for collecting status information and data transmission system of a power system that can transmit and monitor fault information to a higher power company or a power management center for monitoring and analysis.

1 is an overall configuration diagram of a power system showing the installation and operation of the digital protection relay and fault recording device for the protection and control of the power system and fault recording;

2 is a diagram illustrating an example of a configuration of a state information collection and data transmission system of a conventional power system;

3 is a block diagram showing the overall communication network status of the power system state information collection and data transmission system according to an embodiment of the present invention;

4 is a block diagram of the data collection / transmission apparatus of FIG. 3;

5 is a configuration diagram according to the function of the remote failure analysis personal computer device of FIG. 3 installed in a remote or upper power management unit or a head office control place;

FIG. 6 is a diagram illustrating an example of a configuration of a serial communication terminal connection unit with a field apparatus in the data collection / transmission apparatus of FIG. 3.

※ Explanation of code for main part of drawing

300: substation 301-303: digital protective relay or protective relay

304: fault recording device 310: data acquisition / transmission device

311-314: Serial communication terminal connection unit 315: Data bus unit

316: main control unit 317: data storage unit

318: remote communication connection unit 319: digital data input unit

320: display / alarm section 321: field controller communication connection

322: SCADA communication connection 330: control unit of the substation field control room

340,410: modem 400: remote personal computer

420: Personal computer 401,501: Telephone switching network or dedicated communication network

500: SCADA system of upper power management department

In order to achieve the above object, the system for collecting and analyzing state information of a power system according to the present invention transmits power generated from a power plant through a power transmission line connecting a plurality of substations and substations, and the power transmission lines of the substations. The furnace is equipped with multiple types of digital protection relays that detect faults in the transmission system quickly and automatically shut off the system lines, and multiple types of fault recording devices for recording and storing necessary data before and after failures in each power system. A power system in which a plurality of digital protection relays and the fault recorder obtains, manages, and stores a variety of information data relating to a power system state, and a single communication network (e.g., Data collection / transmission to remotely transmit the acquired data through KEPCO communication network Feeding device; A modem connecting the data collection / transmission device to the communication network; And receiving the transmitted data through the modem connected to the communication network, executing a software program corresponding to the corresponding field device to analyze and display the received data, and to communicate with the data collection / transmission device. It is configured to include the parent personal device.

In particular, the data collecting / transmitting apparatus includes: a plurality of serial communication terminal connection units each connected in series communication in a communication connection method corresponding to each of the plurality of digital protection relays and the fault recording apparatus; A data bus unit for connecting data between the main control unit and the serial communication terminal connection unit; Send and receive communication data with the serial communication terminal connection unit via the data BUS unit, control the serial communication terminal connection unit to acquire data from the field device, store the data obtained from the field device, and further differentiate the obtained data. And a main control unit for controlling a remote communication connection unit for driving a modem for remote communication with a personal computer,

Each serial communication terminal connection unit includes a serial terminal control unit for converting parallel data received from the data BUS unit into a serial unit according to a command of the main control unit and performing reverse conversion thereto; In addition, the serial communication terminal selector for selecting a communication channel because each of the serial communication terminal connection unit has two channels for serial communication connection with two field devices; A data storage unit for storing the various types of information data inputted to the main control unit; And converting the parallel data signal obtained from the field apparatus into serial and remotely transmitting the serial data, and receiving the serial data remotely transmitted from the personal computer through a modem to convert the parallel data signal into a parallel data signal and providing the same to the main controller. Communication connection unit; It is configured to include a SCADA communication connection for transmitting data to SCADA in a power management center.

Hereinafter, a state information collection and data transmission system of a power system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the overall communication network status of the power system state information collection and data transmission system according to an embodiment of the present invention, the field apparatus (digital protective relay (301-303)) largely located in the unit substation 300 And a telephone exchange network or a dedicated communication network (401, 501) between the fault recording device 304 and the data collection / transmission device 310 and the SCADA 500 of the upper remote failure analysis personal computer 400 and the upper power management station (power station). It is connected to the network to communicate with each other.

In the unit substation 300, a plurality of digital protection relays 301, 302, 303 and a plurality of power system systems which quickly detect a failure of a transmission system on a transmission line of the substation 300 and automatically shut off the system line. A failure recording device 304 is provided for recording and storing necessary data before and after failure; Acquire, manage, and store various types of information data related to a power system state from the plurality of digital protection relays 301, 302, 303 and the fault recorder 304, and the upper remote personal device 400 or the SCADA 500. A data collection / transmission device 310 for remotely transmitting the acquired information data through a modem 340 and the communication networks 401 and 501, and an external control device 330 such as a computer. It is provided to enable serial data communication with the data collection / transmission apparatus 310.

The upper remote personal device 400 is a modem 410 and a printer 430 for data communication between the personal computer 420 and the personal computer 420 and the data collecting / transmitting device 310 through the communication network 401. ).

FIG. 4 is a block diagram of the data collecting / transmitting apparatus 310 of FIG. 3, which is connected in series communication with the plurality of digital protection relays 301, 302, 303 and the fault recording apparatus 304, respectively. A plurality of serial communication terminal connections 311, 312, 313, 314; A data BUS unit 315 for connecting data between the serial communication terminal connection units 311, 312, 313, 314 and the main control unit; A main control unit (316) for exchanging communication data with the serial communication terminal connection unit via the data BUS unit and controlling the serial communication terminal connection unit to obtain data from the field apparatus; A data storage unit 317 for storing data acquired from the field devices 301, 302, 303, 304 and data received from the digital data receiver 319; In addition, the data is remotely transmitted to the upper personal computer device 400, and receives the data from the personal computer device 400 is provided with a remote communication connection unit 318 to provide to the main control unit 316. The remote communication connection unit 318 of the data collecting / transmitting apparatus 310 converts the parallel data signals acquired from the field apparatuses 301, 302, 303, and 304 into serial and remotely transmits them to the personal computer 400. Serial data transmitted remotely from 400 is received through the modem 340 and converted into a parallel data signal and provided to the main controller 316.

In addition, the data collection / transmission device 310, the digital data receiver 319 for receiving the various digital data provided from the digital protective relay of each field device, the digital data input through the digital data receiver 319 It is configured to further include a display / alarm unit 320 for performing the display and alarm based on.

In addition, the data collection / transmission device 310, the controller communication connection unit 321 for serial data communication between the main control unit 316 and the external control unit 330 consisting of a personal computer in the substation, and the power SCADA communication connection unit 322 for communicating information with the SCADA system 500 installed and operated in a management center (power station, etc.) is configured to further include, where the main of the data collection / transmission device 310 The control unit 316 provides a list of all field devices 301, 302, 303, and 304 installed in each substation 300 through the remote communication connection unit 318 according to a request from the remotely located personal computer 400. According to the request from the external controller 330, through the controller communication connection unit 321 provides a list of all the field devices (301, 302, 303, 304) installed in each substation, and the personal device 400 or When the selection command data signal for selecting one of the provided field device lists is transmitted from the external controller 330, the serial communication terminal connection unit (300) is connected through the data bus unit 315 based on the transmitted selection signal. 311, 312, 313, 314 to control through the communication channel selector 73 in the corresponding serial communication terminal connection portion characterized in that to control the communication channel selection with the field device.

In addition, the control unit 316 of the field data collection / transmission device 310, the selected field device selected from the remote controller 330 installed in the remote control unit 400 or substation control room located remotely. After completing the communication connection with the remote control unit 318 or the control unit communication connection unit 321 by acquiring data from the field device in accordance with the request of the personal computer device 400 and the external controller 330, respectively. Each of the personal computer 400 or the external controller 330 transmits the data acquired from the field device, and stores the acquired data in the data storage unit 317.

5 is a configuration diagram according to the function of the remote failure analysis personal computer 420 of FIG. 3 installed at a remote or upper power management unit or a headquarters control site. The basic operation program is a window, but the serial communication connection routine and substation state are illustrated in FIG. It is equipped with a fault display and connection program that can perform functions such as display and installed relay display, information storage, and driver analysis driver starting by manufacturer. In addition, there is a manufacturer-specific remote failure analysis program performed by the manufacturer-specific failure analysis tool start driver, so that manufacturers (#A, #B, #C ... #D company, etc.) different field devices of different types It is possible to analyze the operating state of the (301, 302, 303, 304) respectively.

Next, the operation of the present invention will be described by classification by function.

First, the data collection / transmission apparatus 310 has a serial communication connection function with digital protection relays 301, 302, 303 and fault recording apparatuses 30, which are different types of field devices. That is, since the physical protection standard of serial communication is different for each manufacturer, such as RS232C, RS422C / RS485, etc., each serial manufacturer has a plurality of serial communication terminal connection parts 311,312,313,314 provided in the data collection / transmission apparatus 310. Provides all the above communication standards so that all field devices 301-304 can be connected for communication.

The serial communication function between the data collecting / transmitting apparatus 310 and the field apparatuses 301 to 304 will be described in more detail with reference to FIG. 6 as follows.

In FIG. 6, the main controller 316 transmits a command and a data signal for the serial communication terminal connection unit 311, 312, 313, 314 through parallel data through the data BUS unit 315. 71) A signal comes in. The parallel data is converted into serial data according to a predetermined format programmed in the main controller 316 in advance by the serial terminal controller 72 and provided to the communication channel selector 315. When a channel of the communication channel selector 315 is selected to select a communication channel connected to the corresponding field device under the control of the main controller 316 and the serial terminal controller 72, The converted serial data is transmitted through a corresponding serial communication terminal connection part 311, 312, 313 or 314 having a connection standard such as RS232C or RS422C / RS485, and power separation is performed by the isolation module 74 at this time. The serial data converted in accordance with the communication standard in the serial communication terminal connection unit 311,312,313 or 314 is transmitted to the field device (301,301,303 or 304) via the external interface (75) to the corresponding field devices Requires data transfer

On the other hand, the serial communication data of the field devices (301 to 304) coming through the external interface 75 through the isolation module 74 in the serial communication terminal connection parts 311-314 opposite to the above path, The serial data is converted into parallel data through the serial terminal controller 72 and transmitted to the main controller 316 through the BUS interface 71. The data of the field devices 301 to 304 transmitted to the main control unit 316 are controlled by the main control unit 316, the external control device 330 in the substation, and the upper personal computer device 400 located remotely. And the SCADA system 500 in the power management office (power station, etc.) to process the necessary data in accordance with the situation. In addition, the main controller 316 stores the data received from the field devices 301 to 304 in the data storage unit 317.

Second, there is a recognition function of field devices.

The main control unit 316 according to the present invention can automatically recognize the manufacturer and model name of the digital protective relay and the fault recording device based on the communication data transmitted from the field devices (301 to 304), This is to recognize and control the format and form of the communication data coming from the field device by comparing with the field device model data previously stored in the data storage unit 317.

Third, the desired connection target can be set among the field digital protection relays 301-303 and the fault recording device 314 using the personal computer 420 of the remote upper personal computer 400 or the field controller 330. Bar, it will be described in detail as follows.

First, the fault analysis personal computer 400 located in the upper part of the remote office (headquarters or the power management office) communicates with the corresponding digital protection relay 301, 302 or 303 or the fault recording device 304 of the substation to access the data. When you want to receive, when the substation 300 is set in the personal computer 420 of the failure analysis personal computer device 400, the setting signal is the modem 410, the communication network 401, the modem 340 and the remote communication connection unit ( 318 is transmitted to the main control unit 316, the main control unit 316 of the substation 300 is a list of the field devices (301 to 304) stored in the data storage unit 317 of the set signal The personal computer is provided to the personal computer 420 through a reverse path. When one field apparatus (one of 301-304) is selected from the provided list through the personal computer 420, the selection signal is transmitted to the main controller 316 through the transmission path of the setting signal. The main control unit 316 controls the serial communication terminal connection unit 311, 312, 313, 314 connected to the field device on the basis of the transmitted selection signal, so that communication connection between the field device and the remote personal computer 420 is established. Will be done. When the communication connection is made, the remote personal computer 420 receives the necessary field device data.

In order to connect to the field apparatus in the remote home 420 as described above, selecting a target substation from a plurality of substation list → accepts a list of system lines and buses of the selected target substation to select the desired system line and busbar → Receive the list of the field devices installed on the selected system line and bus and select the desired digital protection relay and fault recording device. → The communication with the personal computer 420 and the selected field device (301, 302, 303 or 304) is performed. Tree) connection structure, and the communication connection between the controller 330 of the field substation control room and the desired field device is also connected by the tree connection method as described above to receive necessary failure data. .

Fourth, the data collecting / transmitting apparatus 310 has a function of acquiring and storing data from the field apparatuses 301-304. First, contents of data acquired through communication with the digital protection relays 301-303. Fault information including fault time, fault location and fault type, 3-phase voltage / current sampling data before and after fixed fault, relay output state information before and after fault occurrence, relay operation state information by relay check and monitoring, This includes all data provided by the relay through communication.

The contents of the data acquired through communication with the fault recording device 304 include three-phase voltage / current sampling data before and after the fault occurrence stored in the fault recording device, various state information data stored by the fault recording device, and the like. do.

Therefore, in order to receive the failure data of the field devices 301 to 303 and 304 of the substation 300 in which the failure analysis personal computer 420 in the far field is transmitted, it is necessary to connect communication to the field device to receive the data. There is no need to receive the failure data of the previously generated field device stored in the data storage unit 317 in the data collection / transmission device 310 can be received.

In addition, the acquired various data are stored in the data storage unit 317 under the control of the main control unit 316, the storage method is as follows.

① Index the breakdown history and current / current data for each digital protection relay and fault recorder by fault occurrence time and store them in the data storage unit 317.

② It is divided into three categories: fault history management data including status information on various faults such as fault occurrence time, fault location, fault type, three phase voltage / current sampling data before and after fault and other information.

③ The storage in the data storage unit 317 is stored sequentially, and when the storage capacity of the data storage unit 317 of the data acquisition / transmission device 310 is insufficient, the oldest data is automatically deleted first to overwrite (Over Write). )box. The data overwritten at this time is three-phase voltage / current sampling data.

④ Three-phase voltage / current sampling of the data stored in the storage of the data storage unit 317 of the data acquisition / transmission device 310 through the remote personal 420 or the field controller 330 The automatic / manual deletion function for data is used. When the storage capacity of the data storage unit 317 is insufficient, the three-phase voltage / current sampling data is deleted by overwriting the data. In this case, automatic / manual The data is deleted according to the setting, but the history management data such as the occurrence time of the failure information and the type of failure are always stored so that the history management of the failure information is possible. In addition, the history management data for the failure information can not be arbitrarily deleted by the user, and only when the storage capacity is insufficient to perform a separate alarm through the display / alarm unit 320, and to the remote personal device 400 of the far To delete the data stored by the user manually.

Fifth, as described above, the communication function between the data collection / transmission apparatus 310 in the field and the upper personal computer 400 in the far is provided, which will be described in detail as follows.

① Install a high-speed dual-up modem 340 in the data collecting / transmitting device 310 to be connected to a dedicated general telephone network of KEPCO, and the personal 420 of the remote upper personal comb device 400. In addition, the high-speed dual-up modem 410 is used.

② One telephone number is assigned to the data collection / transmission apparatus 310.

③ The data collection / transmission apparatus 310 is provided with an automatic adjustment of the communication data transmission speed with the far-end so that the communication speed is adjusted according to the state of the corresponding communication line.

④ Each address number is assigned to each data collecting / transmitting apparatus 310, and a password and a user name are added by a password and a user name at the time of communication connection from a remote upper personal 420. The person cannot communicate through the personal computer 420, thereby ensuring the confidentiality of the communication.

⑤ The data collecting / transmitting apparatus 310 automatically dials the remote personal computer 420 through the high-speed dual-up modem 340 to enable communication connection. This means that when the field apparatuses 301-303 and 304 of the substation operate and have fault data, the above-mentioned upper part which is registered and approved in advance through the main control unit 316 of the data collecting / transmitting apparatus 310. In order to transmit the failure data to the personal computer 420, the data collection / transmission device 310 automatically dials the remotely approved personal computer 420 to establish a communication connection with the personal computer 420. Attempt to transmit failure data of the field devices (301-303, 304).

⑥ The fault analysis personal computer 420 in the far field collects the data through the high speed dual-up modem 340 in order to receive fault data of the corresponding field devices 301-303, 304 of the substation 300. By dialing the transmission device 310, a communication connection can be made at any time to receive failure data of the field device.

Sixth, the data acquisition / transmission device 310 is provided with a digital DC data input unit, the field devices (301-304) is provided with a communication port for transmitting fault data to the outside, the field device Since the data collecting / transmitting device 310 may not know when 301-304 has stored the data most recently, the field device 301-304 is a digital output signal informing of the data storage point for failure. Since the data acquisition / transmission device 310 can receive the digital output signal and receive the latest failure data after the digital signal in the field apparatus by communication. Of course, if data is transmitted to the outside through the external communication port of the field device as soon as the fault data is stored in the communication function itself of the field devices (301-304), it is not necessary to do so, but the data collection / A digital DC data input unit is provided in the transmission device 310 to always receive the fault data storage set point of the field device 301-304. In addition, in the case of the protective relays 301, 302 and 303 which do not have an external communication port, the data collection / transmitting apparatus 310 may acquire the operation states of the fault information and the alarms of the digital protective relays 301, 302 and 303. A digital DC data input unit for fault data input is provided. At this time, the information that can be obtained from the above-mentioned protective relays 301, 302, and 303, which are not provided with an external communication port, includes fault information data such as ground fault, short circuit, Main / Backup, Z1 / Z2 / Z3, line breakage, and voltage fuse failure. There are various operational status information such as synchronous stop detection, DC power failure, carrier reception, automatic reclosing operation, transmission signal blocking, breaker pressure drop, etc.

Lastly, the data collection / transmission apparatus 310 is provided with a function (providing a local monitoring port) that enables failure analysis through the controller 330 in the field, and the access communication method is RS232C, the external control. The PC environment used as the device 330 is an IBM-compatible 486 or more notebook PC / OS environment, a window, and the controller 330 can print data processed and processed by the controller through a local PC printer.

As described in detail above, according to the state information collection and analysis system of the power system according to the present invention, fault information of the power system is collected and stored from different types of digital protection relays and fault recording devices, and the collected fault information By transmitting the data to a central power company or a power management center for monitoring and analysis, it is effective to monitor and analyze the desired power system in remote or field by applying this device regardless of the type of field device.

Claims (8)

The power generated from the power plant is transmitted through a plurality of substations and transmission lines connecting the substations, and a plurality of multiple types of multiple circuits automatically detect a failure in the transmission system on the transmission lines of each substation and automatically cut off the corresponding system lines. A power system provided with a plurality of types of fault recorders for recording and storing necessary data before and after faults in each power system. Acquire, manage, and store a variety of information data on power system status from the plurality of digital protection relays and the fault recorder, and remotely transmit the acquired data through a single communication network via a single modem. A data collection / transmission device; And And a personal computer that receives the transmitted data, executes a corresponding software program corresponding to the received data, analyzes and displays the received data, and communicates with the data collection / transmission device. System for collecting state information and data transmission of the power system. The method of claim 1, The data collection / transmission apparatus includes: a plurality of serial communication terminal connection portions each connected in series communication in a communication connection scheme corresponding to each of the plurality of digital protection relays and the fault recording apparatus; A data bus unit for connecting data between the main control unit and the serial communication terminal connection unit; And exchange communication data with a serial communication terminal connection through the data bus unit, control the serial communication terminal connection to acquire data from the digital protection relay and the fault recording apparatus, and store the acquired data in a storage means. And a main control unit for controlling a remote communication connection unit for driving a modem to remotely communicate with a higher personal computer. The method of claim 2, The serial communication terminal connection unit, A serial terminal control unit for converting parallel data received from the data BUS unit into serial and performing reverse conversion thereto according to a command of the main control unit; A communication channel selection unit for selecting a communication channel having a plurality of channels; A data storage unit for storing the various pieces of information data input to the main control unit; And Converts the parallel data signal obtained from the digital protection relay and the fault recording device into serial and remotely transmits the serial data, and receives the serial data remotely transmitted from the personal computer through a modem and converts the parallel data signal into a parallel data signal. Providing a remote communication connection; And System information collection and data transmission system of the power system, characterized in that configured to include a SCADA communication connection for transmitting data to the SCADA (SCADA) in the power management center. The method of claim 3, wherein The data collection / transmission apparatus may include: a digital data receiver configured to receive digital data provided from each of the digital protection relay and the fault recording apparatus; And And a display / alarm unit configured to display and alarm based on the received digital data. The method of claim 4, wherein And the main controller controls the communication channel selection of the communication channel selector based on the digital data received from the digital data receiver. The method of claim 2, The data collecting / transmitting apparatus further comprises a communication connection unit for serial data communication between the main control unit and an external controller period. The method of claim 6, And the main controller controls the communication channel selection of the communication channel selector based on command data input from the external controller. The method according to claim 2 or 5, The main controller provides a list of all digital protection relays and fault recording devices installed in each substation according to a request from the personal computer or the external controller, and the list provided from the personal computer or the external controller. And when a selection signal for selecting one of the transmission signals is transmitted, controlling the communication channel selection of the communication channel selection unit based on the transmitted selection signal.