KR102486100B1 - Diagnostic apparatus for protection and distribution board - Google Patents

Abstract

Disclosed is a protective switchgear diagnostic device. An apparatus for diagnosing a protection switchboard of the present invention includes an input/output module providing an interface with a protection switchboard; Through the input/output module, at least one of the circuit breakers or disconnectors in the standard single-line diagram of the protection switchgear is operated to determine whether it is under normal system operation conditions, and if it is under normal system operation conditions, a fault signal is transmitted to the protection switchgear, and the transmitted from the protection switchgear It is characterized in that it includes a control unit for displaying operation state information of the protection switchgear through a display unit.

Description

Protection switchgear diagnostic device {DIAGNOSTIC APPARATUS FOR PROTECTION AND DISTRIBUTION BOARD}

The present invention relates to a protection switchboard diagnosis device, and more particularly, to a protection switchboard diagnosis device for verifying the performance state of a protection switchboard through simulation.

Typically, a protective switchgear is a device used to directly monitor and control transmission and substation facilities. The protection switchboard is provided with a protection relay that commands to separate the fault section in response to a fault occurring in a transmission and substation facility through inputs of a current transformer (CT), a potential transformer (PT) and other contact elements.

The protection switchgear stably supplies power to various transmission and substation facilities, and prevents damage to various power facilities connected to the protection switchgear by cutting off the supplied power when abnormal conditions such as surge, overvoltage or overcurrent occur.

As described above, the protection switchgear has the advantage of always detecting whether or not there is an abnormality in the power system of power generation/substations and transmission/reception facilities so that when an abnormality occurs in the power system within the power generation/substation or transmission/reception facility, it can immediately take action. However, if the monitoring operation is not performed properly due to the occurrence of defects in the protective switchboard itself, it may provide a cause for more serious problems. Therefore, it is necessary to periodically check whether the protection switchgear is operating normally.

Conventionally, the normal operation of the protection switchboard is checked frequently by performing regular and temporary operation inspection tests to maintain its own performance, such as changing the characteristics of the protection switchboard once a quarter or at any time for each power plant/substation or power system facility.

The background art of the present invention is disclosed in 'Protection switchgear diagnosis system and method' of Korean Patent Registration No. 10-2053540 (2019.12.02).

Conventionally, during the completion test of the protective switchgear, first, an individual test (performance test) is conducted to see if the protective relay operates properly at an appropriate value, and after connecting the GIS facility (breaker) and control circuit, an interlock test is conducted to trip the related circuit breaker in the event of a failure It is finally verified whether it operates according to a sequence such as , re-closing, etc.

However, in the prior art, there was a problem in that manpower was operated inefficiently because it took a long time from the completion of the individual test of the protection switchboard to the interlock test.

In addition, in the prior art, during an interlock test according to various operating conditions such as a 345kV transmission line reclosing test or a busbar protection panel test, several to dozens of operation commands are repeatedly transmitted to the circuit breaker in a short time, so the life of the substation equipment (breaker) is shortened , there is always a possibility of damage to the operating mechanism (damage to the 345kV GIS Control Block), and there is a problem that the number of noise complaints due to the continuous operation of the facility increases.

The present invention has been devised to improve the above problems, and an object according to an aspect of the present invention is to provide a protection switchboard diagnosis device for verifying the performance state of a protection switchboard through simulation.

An apparatus for diagnosing a protection switchboard according to an aspect of the present invention includes an input/output module providing an interface with a protection switchboard; an interface unit connected to each input/output contact point of the protection switchboard; And by operating at least one of the circuit breaker or disconnector in the standard single line diagram of the protection switchboard through the input/output module, it is determined whether it is in a normal system operation condition state, and if it is in the normal system operation condition state, a fault signal is transmitted to the protection switchboard, A control unit displaying information on the operating state of the protection switchboard transmitted from the protection switchboard through a display unit, the standard single-line diagram is registered for each protection switchboard, and the input/output module is connected to the circuit breaker and the disconnector in the protection switchboard. DO (Digital Output) module for transmitting at least one of the state information; and a digital input (DI) module that receives operation state information of the protection switchboard from the protection switchboard. and transmits state information of each of the circuit breaker and the disconnector to the protection switchboard to confirm whether or not it is in a normal system operating condition through the protection switchboard.

The protective switchgear diagnostic device according to one aspect of the present invention reduces the power outage work time by minimizing the time for the power outage performed when new power facilities such as lines and transformers are newly installed, expanded, or replaced, and the protective switchboard interlock test time implemented after installation of the facility. and enable efficient manpower operation according to the new installation of protective switchgear and the increase in the quantity of old replacements.

The protective switchgear diagnosis device according to another aspect of the present invention minimizes damage and life span of the protective switchgear due to mechanical stress of substation facilities (breakers) caused by repetitive circuit breaker operation tests, and strengthens interlocking tests (preliminary simulation, actual system facilities) It is possible to improve the operation reliability of the protection switchgear.

A protection switchgear diagnosis device according to another aspect of the present invention can perform a protection switchgear simulation interlock test using a diagnostic device without actual equipment, so that job capabilities can be strengthened by improving understanding of system protection facilities.

1 is a block configuration diagram of a protection switchgear diagnosis device according to an embodiment of the present invention.
2 is a test configuration diagram of a protection switchgear diagnostic device according to an embodiment of the present invention.
3 is a diagram showing a test subject selection screen according to an embodiment of the present invention.
4 is a diagram showing a 154kV transformer protection board selection screen according to an embodiment of the present invention.
5 is a diagram showing a 154kV transmission line protection panel selection screen according to an embodiment of the present invention.
6A to 6C are views showing a 154kV busbar protection panel selection screen according to an embodiment of the present invention.
7a to 7b are diagrams showing a 345kV transformer protection board selection screen according to an embodiment of the present invention.
8A to 8C are views showing a 3454kV transmission line protection panel selection screen according to an embodiment of the present invention.
9A to 9C are views showing a 345kV busbar protection panel selection screen according to an embodiment of the present invention.
10 is a diagram showing a screen of a user setting mode according to an embodiment of the present invention.

Hereinafter, an apparatus for diagnosing a protection switchgear according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

Implementations described herein may be embodied in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Even if discussed only in the context of a single form of implementation (eg, discussed only as a method), the implementation of features discussed may also be implemented in other forms (eg, an apparatus or program). The device may be implemented in suitable hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which is generally referred to as a processing device including, for example, a computer, microprocessor, integrated circuit or programmable logic device or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

1 is a block configuration diagram of a protection switchgear diagnosis device according to an embodiment of the present invention, and FIG. 2 is a test configuration diagram of a protection switchgear diagnosis device according to an embodiment of the present invention.

Referring to FIGS. 1 and 2 , an apparatus for diagnosing a protection switchgear according to an embodiment of the present invention includes a diagnostic device 30 and a user terminal 20 .

The protection switchgear 10 monitors the power system of transmission/distribution lines and power generation/substations connected to busbars and circuit breakers, checks the operation status and measured values of various devices used on transmission/distribution lines, and detects faulty sections of lines in the event of an error. is controlled on/off to prevent the spread of abnormalities.

The user terminal 20 is connected to the diagnostic device 30 through a wired/wireless communication network, receives and transmits various control commands from the user to the diagnostic device 30, and receives and outputs various information transmitted from the diagnostic device 30. do.

For example, the user terminal 20 transmits, to the diagnostic device 30, an operation command for each circuit breaker and disconnector for controlling the operation of the protection switchgear 10 to the diagnostic device 30.

In addition, the user terminal 20 receives operation state information of the protection switchgear 10 from the diagnostic device 30 and displays it.

That is, the user performs a simulated diagnosis on the protection switchboard 10 by controlling the diagnosis device 30 through the user terminal 20 when diagnosing the protection switchboard 10 .

The user terminal 20 may be a notebook computer, a personal computer, a laptop computer, a smart terminal, a personal assistant digital (PDA), etc., but is not limited thereto. The user terminal 20 may be employed as long as it has various communication devices and processors and can transmit/receive various types of information and process information with the diagnosis device 30 through a wired/wireless communication network.

As a wired/wireless communication network between the user terminal 20 and the diagnostic device 30, a local area network (LAN) or serial communication may be employed, and various Internet communication networks or short-distance wireless communication networks may be employed. A wired/wireless communication network may be selected according to a user's communication environment or diagnosis environment.

The diagnosis device 30 operates at least one of the circuit breakers or disconnectors in the standard single-line diagram of the protection switchboard 10 through the input/output module 30 to check whether it is in a normal system operation condition, and if it is in a normal system operation condition, the protection switchboard After transmitting the fault signal to (10), the fault signal is sent out through the internal operation of the protection switchgear 10, and the circuit breaker is opened by the sent signal. Operation state information of the circuit breaker is displayed through the display unit 32.

The standard single-line diagram is a system diagram that generally shows power facilities such as 345/154kV transmission lines and transformer busbars. In addition, at least one circuit breaker or disconnector may be provided in order to prevent the ripple of the abnormality by controlling the fault section line on/off when an error occurs in various devices used on the transmission/distribution line.

In this embodiment, the protection switchboard 10 can select any one of a 154kV transformer protection board, a 154kV transmission line protection board, a 154kV bus protection board, a 345kV transformer protection board, a 3454kV transmission line protection board, and a 345kV bus protection board, , standard single-line diagrams can be registered for each of these protection switchboards (10).

In addition, the standard single-line diagram may be newly created by the user. That is, when a user selects and arbitrarily produces a standard single-line diagram, this newly produced standard single-line diagram can be registered in the same way as the existing protection switchgear 10 . Therefore, when the protection switchgear 10 is newly installed or for education on the protection switchboard, a standard single-line diagram is newly produced, and based on this newly produced standard single-line diagram, a simulated diagnosis is made like the above-mentioned existing protection switchgear 10. can be done

The diagnostic device 30 includes an input/output module 30, a display unit 32, a user setting unit 33 and a control unit 34.

The input/output module 30 provides an interface with the protection switchgear 10 and may be manufactured based on a programmable logic controller (PLC). The input/output module 30 includes a digital input (DI) module 312 and a digital output (DO) module 311 .

The DI module 312 is electrically connected to the protection switchboard 10, receives operation state information of the protection switchboard 10 from the protection switchboard 10, converts it through a PLC, and inputs it to the control unit 34.

Operation state information of the protection switchboard 10 may include trip information and Breaker Failure Initiate (BFI) information of the protection switchboard 10 .

The DO module 311 is electrically connected to the protection switchboard 10 and converts at least one status information (DS status and CB status) of the circuit breaker and disconnector to the protection switchboard 10 input from the control unit 34 through PLC and transmitted to the protection switchgear (10).

The state information of circuit breakers and disconnectors is information about the state of circuit breakers and disconnectors in the protection switchgear 10, and the protection switchboard 10 determines whether normal system operation conditions are satisfied according to the state information of the breakers and disconnectors.

The interface unit is connected to each input/output contact point of the protection switchboard (10).

That is, the protection switchboard 10 and the diagnosis device 30 may be connected through the above-described input/output module 30 and the interface unit as shown in FIG. 2 .

* The display unit 32 displays various types of information for simulated diagnosis of the protection switchboard 10 . For example, the display unit 32 displays a standard single-line diagram of the protection switchboard 10 and displays operation state information of the protection switchboard 10 . Also, the display unit 32 may display the current operating state of the protection switchgear 10 .

That is, the display unit 32 displays the information required for the simulated diagnosis of the protection switchboard 10 and the result of the simulation according to the control signal of the control unit 34 so that the user can diagnose the protection switchboard 10. there will be

The user setting unit 33 newly creates a standard single-line diagram according to a control command input from the user terminal 20, and newly registers the newly created standard single-line diagram as one of the standard single-line diagrams.

The controller 34 operates at least one of the circuit breaker or disconnector in the standard single-line diagram of the protection switchgear 10 through the input/output module 30 to determine whether it is in a normal system operation condition, and if it is in a normal system operation condition, the protection switchboard ( After the failure signal is transmitted to 10), the operation state information of the protection switchboard 10 transmitted from the protection switchboard 10 is displayed through the display unit 32.

The operation process of the controller 34 will be described with reference to FIGS. 3 to 10 .

3 is a diagram showing a test subject selection screen according to an embodiment of the present invention, FIG. 4 is a diagram showing a 154kV transformer protection board selection screen according to an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention A diagram showing a 154kV transmission line protection panel selection screen according to an example, FIGS. 6A to 6C are views showing a 154kV bus protection panel selection screen according to an embodiment of the present invention, and FIGS. 8a to 8c are views showing a 3454kV transmission line protection panel selection screen according to an embodiment of the present invention, and FIGS. It is a view showing a 345kV busbar protection panel selection screen according to an embodiment, and FIG. 10 is a view showing a user setting mode screen according to an embodiment of the present invention.

First, the user terminal 20 displays the protection switchgear 10 capable of a simulated test and allows the user to select it. At this time, the user selects the protection switchgear 10 to be the subject of the simulation test.

FIG. 3 shows a screen listing protective switchboards 10 capable of simulated diagnosis through the user terminal 20 . The protection switchboard 10 may be any one of a 154kV transformer protection board, a 154kV transmission line protection board, a 154kV bus protection board, a 345kV transformer protection board, a 3454kV transmission line protection board, and a 345kV bus protection board.

At this time, the user can select the protection switchgear 10 to perform the simulated diagnosis.

The control unit 34 selects the protection switchboard 10 to be subjected to simulated diagnosis according to a control command from the user terminal 20 . When the protection switchboard 10 is selected, the control unit 34 displays a standard single-line diagram of the corresponding protection switchboard 10 through the display unit 32 .

Next, the control unit 34 may receive an operation command for each circuit breaker or disconnector on the standard single-line diagram from the user terminal 20, and executes the circuit breaker or disconnector according to the corresponding operation command.

Subsequently, the controller 34 transfers the state information of each circuit breaker or disconnector to the protection switchgear 10 through the DO module 311 .

In this case, the protection switchgear 10 determines whether a normal system operation condition is satisfied based on the input state information of each circuit breaker or disconnector. At this time, if it is confirmed that the normal system operation condition is satisfied, the control unit 34 transmits a failure signal to the protection switchgear 10 .

Accordingly, in the protection switchboard 10, the trip output contact operates according to the fault signal transmitted from the control unit 34, and information on the operating state of the protection switchboard 10, for example, trip information or BFI information, is transmitted through the DI module 312. convey

The DI module 312 inputs trip information or BFI information to the control unit 34, and the control unit 34 displays the state of the corresponding protection switchgear 10 through a standard single line diagram according to the corresponding trip information or BFI information.

That is, as shown in FIGS. 4 to 9, the control unit 34 is a standard single-line diagram for each of the 154kV transmission line protection half, the 154kV bus protection half, the 345kV transformer protection half, the 3454kV transmission line protection half, and the 345kV bus protection half. Based on this, a simulated diagnosis of the corresponding protection switchgear 10 can be performed.

In addition, the control unit 34 may perform a simulated diagnosis on the corresponding protection switchgear 10 based on a standard single-line diagram newly created by the user as shown in FIG. 10 .

As described above, the protective switchgear diagnostic device according to an embodiment of the present invention minimizes the time required for interlocking test of the protective switchgear, which is performed when constructing, expanding, or replacing power facilities such as corresponding lines and transformers, thereby shortening the power failure work time, and reducing the power failure work time and protecting the switchgear. Efficient manpower management is made possible according to the increase in new establishments and replacements for old ones.

In addition, the protective switchgear diagnosis device according to an embodiment of the present invention minimizes damage and life span of the protective switchgear 10 due to mechanical stress of substation facilities (breakers) according to repetitive circuit breaker operation tests, and strengthens interlocking tests (previously It is possible to improve the reliability of protection switchgear operation through simulated and real system facilities).

In addition, the protective switchgear diagnosis device according to an embodiment of the present invention can perform a simulated interlocking test for the protective switchgear using the diagnostic device 30 without actual equipment, so as to strengthen job capabilities through improved understanding of system protection facilities. do.

Implementations described herein may be embodied in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Even if discussed only in the context of a single form of implementation (eg, discussed only as a method), the implementation of features discussed may also be implemented in other forms (eg, an apparatus or program). The device may be implemented in suitable hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which is generally referred to as a processing device including, for example, a computer, microprocessor, integrated circuit or programmable logic device or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

Although the present invention has been described with reference to the embodiments shown in the drawings, it should be noted that this is only exemplary and various modifications and equivalent other embodiments are possible from those skilled in the art to which the technology pertains. will understand Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: protection switchboard 20: user terminal
30: diagnostic device 30: input/output module
311: DO module 312: DI module
32: display unit 33: user setting unit
34: control unit

Claims (1)

An input/output module providing an interface with the protection switchgear;
an interface unit connected to each input/output contact point of the protection switchboard; and
Through the input/output module, at least one of the circuit breaker or disconnector in the standard single-line diagram of the protection switchgear is operated to determine whether it is in a normal system operation condition state, and if it is in the normal system operation condition state, after transmitting a fault signal to the protection switchboard, And a control unit for displaying information on the operating state of the protection switchboard transmitted from the protection switchboard through a display unit,
The standard single-line diagram is registered for each protection switchgear,
The input/output module includes a digital output (DO) module for transmitting state information of at least one of the circuit breaker and the disconnector to the protection switchgear; and a DI (Digital Input) module that receives operation state information of the protection switchboard from the protection switchboard.
The control unit receives and executes an operation command for each of the circuit breakers or disconnectors on the standard single-line diagram from the user terminal, and transfers state information of the circuit breakers and disconnectors to the protection switchgear to activate the normal system through the protection switchgear. A protective switchgear diagnostic device characterized in that it checks whether it is in an operating condition.

Images