KR20030017842A - System for analyzing failure of power line - Google Patents

Abstract

PURPOSE: A trouble diagnosis system of power lines is provided to output systematically analytic data on a screen by receiving analytic data about voltage/current of transmission lines and reception lines from a digital relay and diagnosing the analytic data. CONSTITUTION: A communication interface(10) receives analytic data from a digital protection relay. A keyboard(12) is used for operating input information for diagnosing a power system through an input port(16). A coordinate input portion(14) is used for composing coordinate input information through an input port(18). A hard disc drive(20) is used for storing an operating system and a trouble analysis program(22) for displaying the analytic data. A main board unit(24) has a CPU(Central Processing Unit)(26) for executing the trouble analysis program(22) and processing the analytic data. A memory(28) is used for storing the analytic data received from the digital protection relay and a data parameter value of a graphic image. A graphic processing portion(30) converts the analytic data to graphic data. A display portion(32) displays the analytic data.

Description

System for analyzing failure of power line

The present invention relates to a failure analysis system of a power system, and more particularly, by comprehensively displaying and displaying various analysis information on voltage / current data measured from a power transmission system and a distribution system, thereby causing an overall failure of the power system. The present invention relates to a failure analysis system of a power system that enables easy analysis.

In general, a digital protective relay is applied as a device for discriminating a failure state of a transmission line and a distribution line, which are complicatedly distributed by region, to cut off a fault line section at high speed.

The digital protection relay of the power system receives the voltage and current from the transmission system and the distribution line such as transmission line, transformer, bus, etc., respectively, and generates digital voltage / current data through high-speed sampling processing and analog / digital conversion. When the data of the digital voltage / current is analyzed by the protection algorithm and it is determined that the fault condition is caused by the occurrence of the accident, the breaker section can be blocked at high speed. It minimizes the risk of various safety accidents.

On the other hand, in the substations in charge of relaying electric power, digital protective relays for transmission lines, digital protective relays for distribution lines, bus protective relays, and protective relays for transformers are used. High-speed digital protection algorithm is applied, so that the data of voltage / current received before and after an accident can be stored in the internal memory.

However, these digital protection relays display such individual indications because the analysis data of the voltage / current for the failure state of the transmission line or the distribution line can be displayed individually according to an arbitrary operation by the operator of the power system. The state has a problem that it is difficult for the person in charge to comprehensively analyze the cause of the accident.

Accordingly, the present invention has been made in view of the above-described conventional circumstances, and an object thereof is to reproduce various analysis data obtained by analyzing voltage / current of a transmission line and a distribution line from a digital relay of a power system as a comprehensive data analysis screen. It is to provide a failure analysis system of a power system.

1 is a schematic diagram showing a state in which a failure analysis system of a power system is applied according to a first embodiment of the present invention;

2 is a block diagram showing the configuration of a failure analysis system of a power system according to a first embodiment of the present invention;

3 is a flowchart illustrating an operation of a failure analysis system of a power system according to a first embodiment of the present invention;

4 is a diagram illustrating an initial screen state of comprehensive analysis data for failure analysis of a power system according to a first embodiment of the present invention;

FIG. 5 is a diagram showing an analysis data screen in an area designated by a user according to the first embodiment of the present invention; FIG.

6 is a schematic diagram showing a state in which a failure analysis system of a power system is applied according to a second embodiment of the present invention;

7 is a diagram illustrating an example of a locus of impedance for failure analysis of a power system using a digital distance relay according to a second embodiment of the present invention;

8 is a schematic diagram showing a state in which a failure analysis system of a power system is applied according to a third embodiment of the present invention;

9 is a diagram illustrating a characteristic curve for failure analysis of a power system using a digital current differential relay according to a third embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: communication interface, 12: keyboard,

14: coordinate input unit, 16, 18: input port,

20: hard disk drive, 22: failure analysis program,

24: main board unit, 26: central processing unit (CPU),

28: memory, 30: graphics processing unit,

32: display unit, 100: digital protective relay,

200: computer terminal, 300: digital distance relay,

400a, 400b: Digital current differential relay.

In order to achieve the above object, according to the present invention, a failure analysis apparatus of a power system having a digital relay for determining the failure of the line by analyzing the voltage / current from the transmission line and the distribution line by high-speed sampling and digital conversion A communication means for receiving a plurality of types of analysis data on whether there is a failure of a transmission line and a distribution line by communication with the digital relay, and a function of designating a data area for inquiring detailed information about the analysis data. A program storage means for storing a failure analysis program driven for comprehensively displaying input data, multiple types of analysis data from the digital relay on a single display screen, and executing a failure analysis program from the program storage means The digital relay unit received through the communication means Data processing means for performing data processing according to a designated operation of the function input means, graphic processing means for performing graphic processing for displaying the analysis result data processed by the data processing means, and the graphic processing means Provided is a failure analysis system for a power system, characterized in that the display means for displaying the analysis result data from the digital relay processed by the means on a single display screen comprehensively.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 1 is a schematic diagram showing a state in which a failure analysis system of a power system is applied according to a first embodiment of the present invention.

As shown in FIG. 1, in the first embodiment of the present invention, digital data of voltage / current is generated through high-speed sampling and analog / digital conversion by applying voltage / current of a transmission line or a distribution line, and the digital The digital protection relay 100 is applied to analyze voltage / current data by a protection algorithm to determine a failure state of the power system.

When the digital protection relay 100 determines the failure state of the transmission line or the distribution line, the digital protection relay 100 operates the line protection relay 102 to block the transmission line or the distribution line.

On the other hand, the digital protection relay 100 by analyzing the voltage / current data from the transmission line or distribution line by a protection algorithm, the voltage / current data of the line, input / output contact state data, impedance analysis data, Various analysis data such as failure distance data and RMS data for each location are generated.

In the figure, the computer terminal 200 is wired by a communication cable of the communication method such as the digital protective relay 100 and RS-232C, and various analysis data generated from the digital protective relay 100 Each analysis data, i.e. line voltage / current data, input / output contact status data, impedance data, fault distance data for each position, and RMS data are inputted on a single display screen by driving the fault analysis program module. It will be displayed comprehensively.

2 is a block diagram showing a configuration of a failure analysis system of a power system according to a first embodiment of the present invention.

As shown in FIG. 2, the failure analysis system of the power system according to the first embodiment of the present invention includes a communication interface 10, a keyboard 12, a coordinate input unit 14, input ports 16, 18, And a hard disk drive 20, a motherboard unit 24 on which a central processing unit (CPU) 26 is mounted, a memory 28, a graphics processing unit 30, and a display unit 32.

In the figure, the communication interface 10 receives the analysis data from the digital protective relay 100 connected by a communication cable of a communication method such as RS-232C.

The keyboard 12 is operated to create input information for failure analysis of the power system through the input port 16, and the coordinate input unit 14 is used to analyze the failure of the power system through the input port 18. It is for creating necessary coordinate input information on the screen, which is called a "mouse device".

In addition, the hard disk drive 20 is a single display of the system operating program, such as Windows or Linux for the system operation of the computer terminal 200 and the analysis data of the power system received from the digital protection relay 100. The failure analysis program 22 for comprehensively displaying in graphic form on the screen is stored.

In the same figure, the main board unit 24 executes the failure analysis program 22 from the hard disk drive 20 under the arithmetic processing of the central processing unit 26 to receive the communication through the communication interface 10. Various analysis data from the digital protective relay 100 are processed as a comprehensive graphic screen which can be reproduced on a single display screen.

Here, in the main board unit 24, characteristic curves and analysis data for the voltage / current value and event data of the transmission line or the distribution line, and the data of the digital input / output contact state are comprehensively displayed on the display unit 32. In the state of processing data to be displayed on a single screen, when the area designation information for designating a predetermined analysis data area is received from the keyboard 12 or the coordinate input unit 14, voltage / current analysis of the designated data area is performed. The data, the vector diagram of the impedance value, and the phase angle data are processed so that they are collectively displayed on a single screen.

The memory 28 is for temporarily storing various analysis data values received from the digital protection relay 100 and data parameter values of a graphic screen calculated as a result of the data processing of the analysis data.

The graphic processor 30 is for graphic processing of various analysis data according to the data processing of the motherboard unit 24, the display unit 32 is a power transmission line of the power system under the graphic processing of the graphic processor 30 Voltage / current data, input / output contact status data (ie, digital input / output data), and event data of a furnace or a distribution line are collectively displayed on a single screen.

However, the event data is for displaying the status of the protection functions of the digital protective relay 100, the digital output data is actually output to the outside through the logical operation of the event data of the digital protective relay 100 Data indicating the state of the low point to send, the digital input data corresponds to the data indicating the state of the contacts input to the digital protective relay 100 from the outside.

As shown in FIG. 4, the display unit 32 collectively displays characteristic curves for voltage and current values, characteristic curves for digital input / output data, and event data as an initial screen for failure analysis. Done.

Further, the characteristic curve of the voltage / current value displayed on the display unit 32, the characteristic curve for the digital input / output data, and the event data are collectively displayed on the initial screen of the keyboard 12 or the coordinate input unit 14. When a specific characteristic curve region is designated by an input operation, as illustrated in FIG. 5, the voltage value and the current for the characteristic curve region designated by the keyboard 12 or the coordinate input unit 14 are displayed on the display unit 32. Value and digital input / output data are displayed in detail, as well as a vector diagram of the impedance as a frequency analysis value for the voltage / current value of the specified area on the corresponding display screen, and the phase for each phase in that area. The numerical values of the failure analysis data of the angles, RMS, impedance, and power values are displayed in a comprehensive manner.

In addition, in the state in which the numerical values of the voltage / current value and the digital input / output data, the vector diagram, and the failure analysis data of each phase are collectively displayed on a single screen of the display unit 32 in FIG. On the single screen of (32), the sample position at the time of event discrimination and the fault distance are displayed in detail, and the fault distance corresponds to the distance identified through the impedance ratio of the total line and the impedance at the time of the fault occurrence.

Next, an operation according to the first embodiment of the present invention made as described above will be described in detail with reference to the float of FIG. 3.

First, the digital protection relay 100 disposed on a predetermined transmission line or distribution line receives a voltage / current value from the transmission line or distribution line and performs analog / digital conversion through high-speed sampling, thereby performing digital voltage / Current data is generated and various analysis data are generated by analyzing the digital voltage / current data through its own protection algorithm.

In this state, the computer terminal 200 is connected to the digital protective relay 100 and a communication cable such as RS-232C, and the voltage / current data of the line and the input / output contact point from the digital protective relay 100. Status data, impedance analysis data, location-specific failure distance data, and RMS data are received (step S10).

The motherboard unit 24 of the computer terminal 200 executes the failure analysis program 22 stored in the hard disk drive 20 under the arithmetic processing of the central processing unit 26 to receive the input via the communication interface 10. By processing the analysis data from the digital protective relay 100, graphic processing is performed through the graphic processing unit 30 to display various analysis data on a single display screen as a whole (step) S11).

Accordingly, as shown in FIG. 4, the display unit 32 displays the voltage / current value, the event data, and the like on the single display screen driven by the graphics processing unit 30 according to the graphics processing. The data of the digital input / output contact states are collectively displayed (step S12).

In this state, the main board unit 24 specifies among analysis data displayed on the display unit 32 by input operation of the keyboard 12 or coordinate input unit 14 under execution of the failure analysis program 22. It is determined whether or not a data area is designated (step S13).

As a result of the determination, if it is determined by the keyboard 12 or the coordinate input unit 14 that a specific data area is designated among the analysis data of the display unit 32, the main board unit 24 analyzes the data area of the designated data area. As the data is processed, as shown in FIG. 5 on the display unit 32, the numerical value for the voltage / current value of the designated data area and the numerical value for the digital input / output data are displayed. A vector diagram of the magnitude of impedance in the data area is constructed and displayed, and phase angle, RMS, impedance, and power state are collectively displayed as the failure analysis data of the corresponding data area (step S14).

Accordingly, the failure analysis manager of the power system, through the display screen of the failure analysis state displayed on the display unit 32, the type of failure of the transmission line or the distribution line, the shape of the failure waveform, and the input of the protection relay at the time of the failure. It is possible to comprehensively determine the output contact status, fault location, and fault information for each data area.

In this state, the motherboard unit 24 judges whether the keyboard 12 or the coordinate input unit 14 performs an input operation for terminating the execution of the failure analysis program 22 (step S15).

As a result of the determination, when it is determined that the keyboard 12 or the coordinate input unit 14 is performing an input operation for terminating execution of the failure analysis program 22, the corresponding failure analysis program The execution of this is terminated (step S16).

Next, a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

That is, Figure 6 is a schematic diagram showing a state in which the failure analysis system of the power system is applied according to the second embodiment of the present invention.

As shown in FIG. 6, in the failure analysis system of the power system according to the second embodiment of the present invention, the digital distance relay 300 samples the voltage / current values from the transmission line or the distribution line at high speed, and performs analog / By digitally converting and generating digital voltage / current data, the impedance value for voltage / current at the time of failure is divided by the line impedance of the protection section, and the ratio between impedance according to the total line length and impedance at the time of accident The failure of the line is measured.

The digital distance relay 300 includes a function of metering voltage / current, a impedance, power, and the like on a transmission line or a distribution line, and a function of recording an event such as a trip state.

In the figure, the computer terminal 200 is wired to the digital distance relay 300 by a communication cable of a communication method such as RS-232C, and the like, and the digital voltage / current data from the digital distance relay 300; Analyze data such as input / output contact status data, impedance analysis data, location-specific fault distance data, RMS data, and input the voltage / current value, digital input / output data, and impedance trajectory through a single display screen. It provides a comprehensive display of diagrams, phase angles and failure analysis data such as RMS, impedance and power.

In addition, the computer terminal 200 incorporates a dedicated failure analysis program for failure analysis of a transmission line or a distribution line, and processes the analysis data from the digital distance relay 300 by driving the failure analysis program. Thus, various failure analysis information can be collectively displayed on a single display screen. The detailed configuration therein is applied in the same manner as the first embodiment of the present invention shown in FIG.

In the computer terminal 200, a characteristic curve of voltage and current values, digital input / output data, and event data are displayed as an initial screen on a single display screen. When the data area is designated, as shown in FIG. 7, the voltage and current values, the numerical values for the data area designated in the digital input / output data are displayed, and a vector diagram showing the impedance trajectory of the designated data area is displayed. In addition, failure analysis data of phase angle, RMS, impedance, and power in the corresponding data area are displayed, and numerical values of the failure distance are displayed in detail.

Here, the impedance trajectory corresponds to a characteristic curve of an algorithm that obtains an impedance by analyzing data of a frequency of voltage / current at the occurrence of an accident, and grasps the presence or absence of an accident through the real part and the imaginary part of the impedance.

Next, a third embodiment of the present invention will be described in detail with reference to the accompanying drawings.

That is, Figure 8 is a schematic diagram showing a state in which the failure analysis system of the power system is applied according to a third embodiment of the present invention.

As shown in FIG. 8, in the third embodiment of the present invention, each of the digital current differential relays 400a and 400b is provided at both ends of a protection section according to a transmission line or a distribution line, and the current differential relay 400a is provided. It is possible to determine whether there is a failure of the line according to the difference between the current value of the own end and the current value of the other end by high speed sampling and analog / digital conversion by receiving the current value through the remote communication between and 400b).

Each of the plurality of digital current differential relays 400a and 400b includes communication interface units 402a and 402b so that the magnitude and direction of current data can be compared by digital communication through a communication network. The network standard on the communication network to which the communication interface units 402a and 402b are applied is made by PCM communication such as the CCITT G.703 standard.

The specific digital current differential relay 400a among the plurality of digital current differential relays 400a and 400b is connected to the computer terminal 200 by wire through a communication cable according to a communication method such as RS-232C, and the computer terminal. Analysis data such as voltage / current data, input / output contact state data, location-specific failure distance data, and RMS data are transmitted to the 200.

The computer terminal 200 receives various analysis data from the digital current differential relay 400a, and displays characteristic curves of voltage / current values, digital input / output data, and current differential characteristics through a single display screen. The fault analysis data such as phase angle, RMS, impedance, and power are displayed in a comprehensive way.

In addition, the computer terminal 200 has a built-in failure analysis program for failure analysis of a transmission line or a distribution line, and the analysis data from the digital current differential relay 400a is driven by driving the failure analysis program. It is possible to collectively display various failure analysis information on a single display screen by processing, and the detailed configuration therein is applied in the same manner as the configuration according to the first embodiment of the present invention shown in FIG.

In the computer terminal 200, a characteristic curve of voltage and current values, digital input / output data, and event data are displayed as an initial screen on a single display screen. When the data area is designated, as shown in Fig. 9, the voltage and current values, the numerical values for the data area specified in the digital input / output data are displayed, and the characteristic curve for the current differential characteristics in the designated data area is displayed. The fault analysis data of phase angle, RMS, impedance, and power in the corresponding data area are displayed, while the numerical value of the fault distance is displayed in detail.

Here, the current differential characteristic curve corresponds to a characteristic curve of an algorithm for determining the presence or absence of an accident through the ratio of the vector component and the scalar component of the current and the relative current when the accident occurs in the transmission line or the distribution line.

It is a matter of course that the present invention having the above-described embodiments can be variously modified and implemented without departing from the technical spirit of the present invention without departing from the embodiments.

According to the present invention as described above, it is possible to display the analysis data from the various relays for analyzing the failure of the transmission line or distribution line on a single display screen using a computer terminal, so that the operation of the power system The person in charge has the effect of comprehensively and accurately analyzing the cause of the accident on the track.

Claims (7)

In the failure analysis device of the power system with a digital relay for determining the failure of the line by analyzing the voltage / current from the transmission line and the distribution line by high-speed sampling and digital conversion, Communication means for receiving a plurality of types of analysis data on the presence or absence of transmission line and distribution line failure by communication with the digital relay; Function input means for designating a data area for inquiring detailed information about the analysis data; Program storage means for storing a failure analysis program driven to collectively display a plurality of types of analysis data from the digital relay on a single display screen; Data processing means for executing a failure analysis program from the program storage means and processing data from the digital relay received through the communication means according to a designated operation of the function input means; Graphic processing means for performing graphic processing for displaying the analysis result data processed by the data processing means; And display means for comprehensively displaying analysis result data from the digital relay processed by the graphic processing means on a single display screen. The system of claim 1, wherein the digital relay for transmitting the analysis data to the communication means is any one of a digital protection relay, a digital distance relay, and a digital current differential relay. The power system failure of claim 1, wherein the plurality of types of analysis data are voltage / current data of a line, input / output contact state data, impedance analysis data, location-specific failure distance data, and RMS data. Analysis system. 2. The power system according to claim 1, wherein the data processing means performs data processing such that the voltage / current value of the line, the event data, and the digital input / output contact states are collectively displayed on the display means as an initial screen. Failure analysis system. The data processing means of claim 4, wherein the data processing means comprises: a vector diagram representing the magnitude and phase angle of the impedance with respect to the frequency analysis value of the data region designated by the function input means; A failure analysis system for a power system, characterized in that the data processing to be displayed on the means comprehensively. 5. The data processing means according to claim 4, wherein the data processing means comprises a vector diagram of impedance trajectories representing real and imaginary parts of impedance with respect to frequency analysis values of the data area designated by the function input means, fault analysis data for each item, and fault distance data. Data processing so that the display is comprehensively displayed on the display means. The data processing means according to claim 4, wherein the data processing means comprises: a current differential characteristic curve representing a ratio of the vector component and the scalar component of the magnetic current and the relative current in the data region designated by the function input means; And data processing so that the data of the distance is displayed on the display means in a comprehensive manner.