KR102088740B1 - An artificial intelligence-based parameter setting value automatic calculation protection relays - Google Patents

Abstract

The present invention discloses an artificial intelligence based automatic calculation protection relay device. The device includes an input converter that receives input information from a current transformer for an instrument and a transformer for an instrument and converts the data into a plurality of protective relays; An input unit for receiving the converted data for the plurality of protective relays, filtering and encoding, and temporarily storing the encoded data; A data processing unit that analyzes a power system accident of the corresponding device by referring to the temporarily stored data as a failure event case waveform data for a device in which a power system accident occurs among a plurality of devices; A setting unit that is equipped with an automatic calculation program for correcting the protective relay, receives data about the collected equipment to be protected, automatically sets the setting parameter value, and determines in real time whether or not the automatically set setting parameter value is appropriate when operating the power facility. ; An output interface for receiving a contact from the outside or outputting a blocking signal by configuring a protection element operation output as logic; And a communication unit that communicates with the plurality of protection relays and transmits the automatically set setting parameter value.

Description

An artificial intelligence-based parameter setting value automatic calculation protection relays

The present invention relates to a protective relay device, in particular, when the user inputs only the data necessary for correcting the protective relay, the artificial intelligence unit automatically calculates the protection relay setting and automatically sets it, and protects smart system failures against various power system accidents By performing management, the present invention relates to an artificial intelligence-based correction value automatic calculation protection relay device capable of minimizing a protection relay correction error and preventing malfunction of the protection relay.

The power system often changes its configuration due to section switching and restoration due to failure, and inspection of equipment and facilities.

In this case, factors necessary for correcting the protective relay, such as a fault current, can be changed.

Therefore, it is necessary to change the correction values of the protective relays according to the changed system configuration for proper protection when the system configuration is changed.

However, the correction task is one of the most difficult tasks, and it is difficult to respond to frequent system configuration changes in real time because it is currently performed manually by a correction expert.

The automatic reclose circuit breaker detects a fault current when a load side failure occurs at the installation point, cuts off the overcurrent at a high speed by itself at a specified time, and automatically recloses to re-pressurize the fault section.

In the event of an instantaneous failure, the circuit breaker can prevent an outage of the line by providing an opportunity to eliminate the instantaneous failure by repeating the operation of blocking-reclosing.

In addition, the circuit breaker is the most ideal current-sensing and current protection device capable of separating the failure section and minimizing the power failure area by permanently opening the circuit breaker after a certain number of times of operation in the event of a temporary failure.

It is possible to increase the use efficiency of the circuit breaker in a long line in an outdoor area where a large number of instantaneous failures occur, such as a foreign object contact failure such as tree contact.

The power system has a very complex structure that includes elements such as numerous power plants, substations, and transmission and distribution lines.

These power systems must have a constant voltage and frequency, and must be reliably operated to supply power to meet demand.

However, according to the consumer's intention, the ever-changing power demand and natural failures affect voltage, frequency, etc., making it difficult to supply reliable power.

In particular, when a failure occurs in the power system, a very large current is generated at the point of failure, which may cause a large power outage as well as damage to humans and numerous property.

The relay detects such abnormal system conditions and reacts as quickly as possible to return the system to a normal state.

Such a relay is also called a protective relay, and a system designed and installed to perform this role is called a protective relay system.

However, most of the non-experts are embarrassed when operating the protective relay of the switchgear, and even experts who are familiar with the product manual may not be able to adequately respond to emergency measures. There is this.

In constructing the protective relay system, a suitable protective relay is adopted for each facility, a protection section is determined, and they are well cooperated with each other (Relay Coordination) to ensure optimum operation characteristics and reliability.

Suitable relay system and protection for each facility, such as generator, transformer protection, bus, transmission and distribution lines, and motors, for reliable operation and rapid failure selection Should have scope.

In addition, the above protection ranges are configured to overlap with each other in order to prevent a ripple caused by malfunction or non-operation of reliable operation and protection relays, and primary protection can be selected and blocked by detecting the failure within the protection range first. The protection relay is operated so as to be able to operate, and the backup protection refers to a protection relay that is operated to prevent the expansion and ripple when the main protection fails.

That is, based on the information (voltage, current, frequency, phase, etc.) detected by the protective relay, a document necessary to input various parameters required for the protective relay to accurately determine whether or not the power facility is abnormal can be prepared. The series of tasks is called Protection Relay Setting Study.

Particularly, since the protection relay is a device that judges only based on the parameters set in the protection relay, there is a problem that it can be expanded to a big accident due to malfunction or non-operation in the case of a correction error.

In addition, since the correction task is one of the most difficult tasks, it is currently performed manually by a correction expert, and it is practically impossible to respond to frequent system changes in real time.

On the other hand, since the overcurrent cutoff protection relay system serves as the main protection for the normal child section and the rear end protection for the adjacent section, coordination with the relay in the adjacent section must be sufficiently considered.

Therefore, correction for the system change can be considered by dividing it into correction of pickup current and correction of operating time.

First, looking at the correction of the pickup current, the protection relay operation threshold value, the pickup current, must be able to completely protect not only accidents in the magnetic domain but also protection in the adjacent segment.

The pickup current is determined by tap, which must be greater than the maximum load current and less than the minimum fault current to avoid malfunction and increase sensitivity.

It is usually set at 125 to 150% of the maximum load, and the minimum fault current is calculated by assuming a 2-wire short circuit or 2-wire ground fault depending on the type of the overcurrent relay.

Next, looking at the correction of the operation time, when the correction of the pickup current by the tap is finished, the operation time is determined by a time dial or a time lever in order to cooperate with the overcurrent relay period of the adjacent section. .

The protective relay should operate as soon as possible in the case of a fault in its own section, and with a cooperative time for a fault in the adjacent section.

1 is a conceptual diagram showing a distribution system showing the necessity of redefining an overcurrent relay in the prior art.

Power systems can often be changed due to load transfer and recovery, and inspection of equipment or equipment, and in particular, distribution system changes frequently.

Referring to FIG. 1, in the initial state of the system, the circuit breakers on the C and G relays are open, and power is supplied from the first substation to the first load.

Therefore, the short-circuit impedance for obtaining the pickup currents of the relays E and F is a value including the line impedance to the relay installation point including the front system of the first substation, respectively.

Next, when the breaker on the A side is opened for reasons such as repair of the power distribution system, and when the breaker on the C side is closed, power is supplied to the load 1 from the second substation.

Therefore, the short circuit impedances of relays B, E, and F are changed.

In addition, the fluctuation of the load may always be fluid with the input and opening of the G-side breaker.

For proper protection in this situation, all relays that are affected by the correction value for the situation of a system that can be variably changed need to change the correction value of the relay flexibly.

However, in the related art, it is quite difficult to change the corrected value of the relay, and it is performed manually by a correction expert. Therefore, even if such a system change occurs, realignment of the equipment to be protected has not been actually performed.

In addition, the conventional distribution system protection coordination correcting device was required to manually calculate the setting parameters required for each manufacturer and model of the protective relay, and to type and document the calculation process and results, and thus the possibility of an error in the process was very high.

As described above, since it is not easy to correct the protection relay according to a change in the system, the sensitivity of detecting a failure in the protection relay is taken as low as possible, and as a result, there is a limitation that it is difficult to detect a high-sensitivity failure.

The general operating task of the overcurrent protection relay is to determine the load current and the fault current, and in the event of a fault, cooperate with the surrounding protection relay and eliminate the fault as soon as possible.

The protection method by the overcurrent relay is the most basic method among the protection relay methods of the transmission and distribution lines, and is simple and has economic advantages.

Currently, the main protection path is limited to the protection of relatively low-voltage radioactive transmission and distribution lines and on-board circuits of substations, and is generally used as a back-end protection.

However, as described above, since it is not easy to correct the protective relay according to a change in the system, there is a limit to take the sensitivity to detect the failure as low as possible, such as setting the value of the minimum failure current high.

The basic principle of the overcurrent relay is to detect that an accident current greater than the load current always flows when an accident occurs in the transmission and distribution lines, and operate to issue a cut-off signal at a time inversely proportional to the accident current so that it operates quickly at a large accident current.

That is, a value greater than the maximum load current and less than the minimum fault current is set as a pickup current, which is an operation threshold value of the protective relay, and when more than this current flows into the system, it is determined as an accident and operates in time cooperation with the surrounding protective relay.

On the other hand, artificial intelligence (AI) mimics the human brain and neuronal neural networks, so that computers or robots someday think and act like humans.

For example, we can distinguish dogs and cats very easily from pictures alone, but not computers.

To this end, the “Machine Learning (ML)” technique was devised, which is a technique that inputs a lot of data into a computer and classifies the similar ones. The computer is sorting.

Depending on how you classify your data, many machine learning algorithms, such as decision trees, Bayesian networks, support vector machines (SVMs), and artificial neural networks, appear. did.

Among them, deep learning (DL) derived from an artificial neural network algorithm is a technique used to cluster or classify data using an artificial neural network.

Artificial neural networks in machine learning and cognitive science are statistical learning algorithms inspired by biological neural networks (the animal's central nervous system).

The artificial neural network refers to an overall model having a problem-solving ability by changing the strength of synaptic binding through learning of artificial neurons that form a network through the combination of synapses.

The key to deep learning using artificial neural networks is prediction through classification.

Computers share data just as humans distinguish objects by discovering patterns among numerous data.

This type of discrimination includes instruction (director / teacher) learning that is optimized for the problem by inputting the signal (correct answer) from the leader (supervisor / teacher) and unsupervised (director / teacher) learning that does not require the teacher's signal. have.

In general, it is expressed as an interconnection of neuron systems that calculate values from inputs, and is adaptable to perform machine learning such as pattern recognition.

Like other machine learning learning from data, neural networks are commonly used to solve a wide range of problems, such as computer vision or speech recognition, which are difficult to solve with rule-based programming.

That is, when there is any data, many studies have been conducted to express it in a form that a computer can recognize (for example, a tool that expresses pixel information as a column vector in the case of an image) and apply it to learning. As a result, various deep learning techniques such as deep neural networks, convolutional neural networks, and recurrent neural networks are used in areas such as computer vision, speech recognition, natural language processing, and speech / signal processing. Application programs with excellent performance are being developed.

On the other hand, the Internet of Things (IOT) method refers to communication for providing object information to a person or an intelligent device using a communication network, or for a person or an intelligent device to control the state of an object.

In the past, the Internet of Things in the early and early 1990s meant one-to-one or one-to-many communication for simple P2P (Point-to-Point) connection, and ultimately, the goal of IoT communication is location awareness, situational awareness, and augmented reality. It aims to improve the quality and stability of Internet of Things (IoT) communication services by automatically operating without human control or with minimal human intervention tailored to the individual or situation.

Currently, a wide variety of services, such as remote meter reading, building or facility management, vending machine management, indoor lighting control service, traffic information and vehicle control, emergency dispatch, fire alarm, security alarm devices, telematics, wireless payment service, etc. Is being provided.

Internet of things communication is a communication between devices, and it shows a difference in many characteristics from the existing human-centered human-to-human (H2H) communication.

From these differences in characteristics, technically necessary technologies may vary, and required characteristics may vary slightly depending on the application field using IoT communication.

Accordingly, the present inventors, when the user inputs only the data necessary for correcting the protective relay, the artificial intelligence unit and the big database automatically set the protection relay setting internally by using machine learning techniques, and detect the failure for various power system accidents. We would like to propose an artificial intelligence-based automatic correction protection relay device that can perform smart power system failure protection management for IoT devices without lowering.

KR 10-1030986 B1

The object of the present invention is that when the user inputs only the data necessary for correcting the protective relay, the artificial intelligence unit automatically calculates and sets the protective relay internally and automatically manages the smart system fault protection management by utilizing the big database of various power system accidents. It is to provide an automatic artificial intelligence-based correction value protection relay device to perform.

The artificial intelligence-based correction value automatic calculation protection relay device of the present invention for achieving the above object is an input conversion unit that receives input information from the current transformer and the transformer for the instrument and converts it into a plurality of protection relay data; An input unit for receiving the converted data for the plurality of protective relays, filtering and encoding, and temporarily storing the encoded data; A data processing unit that analyzes a power system accident of the corresponding device by referring to the temporarily stored data as a failure event case waveform data for a device in which a power system accident occurs among a plurality of devices; A setting unit that is equipped with an automatic calculation program for correcting the protective relay, receives data about the collected equipment to be protected, automatically sets the setting parameter value, and determines in real time whether or not the automatically set setting parameter value is appropriate when operating the power facility. ; An output interface for receiving a contact from the outside or outputting a blocking signal by configuring a protection element operation output as logic; And a communication unit that communicates with the plurality of protection relays and transmits the automatically set setting parameter value.

The input unit of the artificial intelligence-based correction value automatic calculation protection relay device of the present invention for achieving the above object is a plurality of filters for receiving the converted data for the plurality of protection relays and low-pass filtering; A plurality of sampling holders receiving the filtered data for a plurality of protective relays and dispensing in synchronization with a sampling pulse clock; A multiplexer for receiving and encoding the divided plurality of protective relay data; An AD converter that receives the encoded protective relay data and converts it into digital data; And a buffer for receiving and temporarily storing the converted digital data.

The data processing unit of the artificial intelligence-based correction value automatic calculation protection relay device of the present invention for achieving the above object receives the temporarily stored data and interlocks with the big database to store the failure accident case waveform as big data; And a failure analysis unit that analyzes the power system accident of the corresponding device by referring to the stored fault incident case waveform data for the corresponding device where the power system accident has occurred.

The input unit of the artificial intelligence-based correction value automatic calculation protection relay device of the present invention for achieving the above object receives the contact input and transmits it to the output interface for the device having the power system accident and generates the blocking signal It characterized in that it further comprises an input interface;

Automatic calculation of artificial intelligence based correction value of the present invention for achieving the above object The artificial intelligence unit of the relay device checks the setting parameter value of the selected protected device in real time, and automatically protects it when it is determined that a change is necessary It is characterized by changing the setting value of the protective element of the relay.

To achieve the above object, the artificial intelligence part of the artificial intelligence-based correction value automatic calculation protection relay device of the present invention uses the actual failure waveform or the electromagnetic transient analysis program to simulate the failure current for each failure case. It is characterized in that it is stored in the ROM, and is recognized as the same accident when a failure accident waveform having a pattern similar to the stored failure accident waveform is detected when power equipment is operated.

The plurality of elements of the artificial intelligence-based correction value automatic calculation protection relay device of the present invention for achieving the above object is characterized by including a rear system, a transmission line, a distribution line, a transformer, a synchronous generator, an electric motor, and a busbar.

Automatic setting of artificial intelligence-based correction value of the present invention for achieving the above object.When the setting unit of the protective relay device collects data on the device to be protected, data is drawn by drawing a power system in the automatic calculation program for correcting the protective relay. A data input unit; A fault current calculation unit that calculates a fault current by executing the automatic calculation program for correcting the protection relay; And a protection relay correcting unit that corrects a protection relay parameter according to a preset correction criterion and the calculated fault current, and prepares a protection cooperation curve and a protection relay correction table, wherein the protection relay correction automatic calculation program comprises the drawing When the protection relay is added to the power system at the corresponding location, the device around the protection relay is recognized to automatically determine the device to be protected.

The artificial intelligence-based correction value automatic calculation of the present invention for achieving the above object The data input part of the protection relay device executes the protection relay correction automatic calculation program to arrange and draw the plurality of elements according to the power system situation and connect them to each other Let the power system drawing unit; And a simulation data input unit for inputting simulation data required for a fault current simulation to each of the plurality of devices.

Automatic calculation of correction value based on artificial intelligence of the present invention for achieving the above object. The fault current calculation unit of the protection relay device receives the simulation data and automatically calculates the protection relay correction program according to the selected setting parameter value of the device to be protected. A fault current simulator that executes to calculate the fault current; And a result value output unit for outputting a fault current distribution for the calculated fault current.

Automatic calculation of artificial intelligence-based correction value of the present invention for achieving the above object The protection relay correction unit of the protective relay device receives data about the collected equipment to be protected and organizes the data into data for correction of the protection relay; A correction criterion setting unit that receives the summarized data and sets the correction criterion of parameters for calculating settings for each correction type of the protective relay; A protection disconnection diagram preparation unit for drawing the installation position, device rating and protection element of the protection relay device for each correction type by receiving the set correction criteria; A protection relay parameter calculator configured to receive the created drawings and automatically set each correction type according to a manual of a protection relay to calculate a value of the protection relay parameter; A protection cooperation review unit for extracting the protection cooperation curve by using the calculated value of the protection relay parameter of the protection relay selected from the protection relays; And a protection relay correction table preparation unit for preparing the protection relay correction table by tabulating parameters required for setting based on the calculated protection relay parameter values.

Automatic calculation of artificial intelligence based correction value of the present invention for achieving the above object The protection relay correction unit of the protection relay device includes the data organizing unit, the correction standard setting unit, the protection disconnection diagram preparation unit, the protection relay parameter calculation unit, the It characterized in that it further comprises; a final book preparation unit for collecting and documenting the results generated by the protection cooperation review unit and the protection relay correction table preparation unit.

The artificial intelligence-based correction value automatic calculation protection relay device of the present invention for achieving the above object is an input conversion unit that receives input information from the current transformer and the transformer for the instrument and converts it into a plurality of protection relay data; An input unit for receiving the converted data for the plurality of protective relays, filtering and encoding, and temporarily storing the encoded data; A data processing unit that analyzes a power system accident of the corresponding device by referring to the temporarily stored data as a failure event case waveform data for a device in which a power system accident occurs among a plurality of devices; A setting unit that is equipped with an automatic calculation program for correcting the protective relay, receives data about the collected equipment to be protected, automatically sets the setting parameter value, and determines in real time whether or not the automatically set setting parameter value is appropriate when operating the power facility. ; An output interface for receiving a contact from the outside or outputting a blocking signal by configuring a protection element operation output as logic; And a communication unit that communicates with the plurality of protection relays or portable terminal devices and transmits the automatically set setting parameter value, and utilizes the Internet of Things to acquire real-time power system status information of the plurality of devices. It is characterized by controlling the power system state of the device.

The specific details of the other embodiments are included in the "specific contents for carrying out the invention" and the attached "drawings".

Advantages and / or features of the present invention and methods for achieving them will be made clear by referring to various embodiments described below in detail together with the accompanying drawings.

However, the present invention is not limited to the configuration of each embodiment disclosed below, but may also be implemented in various different forms. Each embodiment disclosed in the present specification makes the disclosure of the present invention complete, and It is to be understood that the scope of the present invention is provided to those of ordinary skill in the art to which the invention pertains, and the present invention is only defined by the scope of each claim of the claims.

According to the present invention, the artificial intelligence unit internally calculates and automatically sets the data necessary for the correction of the protective relay input by the user, and checks in real time the adequacy of the setting value for each protected device, thereby minimizing the correction error of the protective relay. , It is possible to prevent malfunction of the protective relay.

In addition, when a power system accident occurs in a predetermined device among a plurality of power devices, the power system accident of the corresponding device is analyzed and a big database is monitored and controlled by referring to the data on the failure event case waveform in conjunction with the big database. Therefore, it is possible to prevent various power system accidents.

1 is a conceptual diagram showing a protection scheme of an overcurrent relay that forms a protection cooperation with each other in the prior art.
2 is a block diagram of an artificial intelligence-based automatic correction protection relay device according to the present invention.
3 is a block diagram showing the internal components of the setting unit 540 in the protective relay device shown in FIG. 2.
FIG. 4 is a block diagram showing the internal components of the protection relay correction unit 400 in the protection relay device shown in FIG. 3.
5 is a flowchart illustrating the overall operation of the setting unit 540 in the protective relay device shown in FIG. 2.
FIG. 6 is a table of data items and parameters of the device to be protected collected in operation S100 during operation of the protection relay device shown in FIG. 5.
7 is a distribution diagram of the fault current calculated in step S400 during operation of the protective relay device shown in FIG. 5.
8 is a graph of the protection coordination curve created in step S600 during operation of the protection relay device shown in FIG. 5.
9 is a protection relay correction table prepared in operation S600 during operation of the protection relay device shown in FIG. 5.
FIG. 10 is a table showing the results of the first embodiment of the simulation of calculating the fault current during operation of the protective relay device shown in FIG. 5.
11 is a table showing the results of the second embodiment of the simulation of calculating the fault current during operation of the protective relay device shown in FIG. 5.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention in detail, the terms or words used in this specification should not be interpreted as being unconditionally limited in a conventional or lexical sense, and the inventor of the present invention may explain his or her invention in the best way. It should be understood that the concept of various terms can be properly defined and used, and furthermore, these terms or words should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

That is, the terms used in this specification are only used to describe preferred embodiments of the present invention, and are not intended to specifically limit the contents of the present invention, and these terms are used to describe various possibilities of the present invention. It should be understood that this is a term defined in consideration.

In addition, in this specification, it should be understood that a singular expression may include a plurality of expressions, unless similarly indicated in a different meaning in the context, and similarly, even if expressed in plural, may include the meaning of the singular. do.

When describing a component as "comprising" another component throughout this specification, the component is further excluded from any other component unless specifically stated to the contrary. It could mean you can do it.

Furthermore, when a component is described as being "existing in or connected to another component", the component may be installed directly connected to or in contact with another component, and may be It may be installed spaced apart from a distance, and when installed spaced apart from a certain distance, there may be a third component or means for fixing or connecting the component to other components. It should be understood that the description of the components or means of 3 may be omitted.

On the other hand, if a component is described as being “directly connected” or “directly connected” to another component, it should be understood that the third component or means does not exist.

Similarly, other expressions describing the relationship between each component, such as "between" and "immediately between", or "neighboring to" and "directly neighboring to", have the same effect. It should be interpreted as.

In addition, in this specification, the terms "one side", "other side", "one side", "other side", "first", "second", etc., if used, this one component for one component It is used to clearly distinguish from other components, and it should be noted that the meanings of the components are not limited by these terms.

In addition, in the present specification, terms related to positions such as “upper”, “lower”, “left”, and “right”, if used, should be understood as indicating relative positions in corresponding drawings with respect to corresponding components, Unless an absolute position is specified for their position, these position-related terms should not be understood as referring to an absolute position.

Moreover, in the specification of the present invention, terms such as “… unit”, “… group”, “module”, and “device”, if used, refer to a unit capable of processing one or more functions or operations, which are hardware. Or it should be understood that it can be implemented in software, or a combination of hardware and software.

In addition, in this specification, in designating reference numerals for each component in each drawing, for the same component, the component has the same reference number even though it is displayed in different drawings, that is, the same reference throughout the specification. Reference numerals denote the same components.

In the drawings attached to the present specification, the size, position, and coupling relationship of each component constituting the present invention are partially exaggerated, reduced, or omitted in order to sufficiently convey the spirit of the present invention or for convenience of explanation. It may be described, so the proportion or scale may not be strict.

In addition, in the following, in describing the present invention, a detailed description of a configuration determined to unnecessarily obscure the subject matter of the present invention, for example, a known technology including the conventional technology may be omitted.

Figure 2 is a block diagram showing the internal components of the artificial intelligence-based correction value automatic calculation protection relay device according to the present invention, the input conversion unit 510, input unit 520, data processing unit 530, setting unit 540 , An output interface 550, a communication unit 560, an artificial intelligence unit 600 and a big database 700.

The input unit 520 includes a plurality of filters 521, a plurality of sampling holders 522, a multiplexer 523, an AD converter 524, a buffer 525 and an input interface 526, and a data processing unit 530 Has a ROM 532 and a failure analysis unit 534.

The configuration and function of the artificial intelligence-based automatic calculation protection relay device according to the present invention will be described with reference to FIG. 2 as follows.

The input converter 510 receives input information such as voltage and current from external CTs (transformers for instruments), PTs (transformers for instruments), and converts them into data for a plurality of protective relays that are easy to process in a protective relay.

The plurality of filters 521 receives a plurality of protection relay data converted from the input conversion unit 510 and performs low-band filtering.

The plurality of sampling holders 522 receive data for a plurality of protection relays filtered by a low band from the plurality of filters 521 and distribute them in synchronization with the sampling pulse clock.

The multiplexer 523 receives data for a plurality of protective relays distributed from the plurality of sampling holders 522, encodes them, and outputs them.

The AD converter 524 receives the encoded protective relay data from the multiplexer 523 and converts it into digital data.

The buffer 525 receives the digital data converted from the AD converter 524 and temporarily stores it.

The ROM (Read Only Memory, ROM, 532) receives the temporarily stored data from the buffer 525 and works with the big database 700 to store the failure event waveform as big data.

Here, the big database 700 prevents electric power accidents for monitoring power facilities in normal times, and is used for fault reading in the event of an accident.

The setting unit 540 is equipped with a protection relay correction automatic calculation program 100, and when data about the device to be protected is input by the user, it is received and calculated internally to automatically set the setting parameter value.

In addition, it is determined by monitoring in real time whether the setting value is appropriate when power equipment is in operation.

When a power system accident occurs in a predetermined device among a plurality of devices (not shown), the failure analysis unit 534 works with the artificial intelligence unit 600 to refer to the data on the waveform of the case of the failure, thereby powering the device. Analyze systematic accidents and generate accident analysis reports on them.

If the analyzed accident is a new accident type, it is additionally stored in the big database 700 as a failure case.

The input interface 526 receives a contact input from the outside and transmits it to the output interface 550 for a corresponding device having a power system accident, thereby generating a trip signal.

At this time, the output interface 550 may output a blocking signal by configuring a protection element operation output by logic by a user.

The communication unit 560 basically monitors a power system failure by communicating with a plurality of protective relays and / or portable terminals using a communication protocol standardized by the International Electrotechnical Commission (IEC), and remotely checks and changes the setting value. Enable monitoring control.

In addition, the communication using the Internet of Things technology of the power device monitoring sensor has a built-in communication function to enable monitoring in a protective relay.

That is, the application of the portable terminal can be implemented so that the user can check the setting value of the protection relay for the Internet of Things device and monitor in real time.

At this time, the artificial intelligence-based correction value automatic calculation protection relay device of the present invention utilizes the Internet of Things to acquire real-time grid condition information, and utilizes the IEC-61850-based protocol, so that it not only protects and controls the power system, but also prevents inspection. It becomes possible.

FIG. 3 is a block diagram of the setting unit 540 in the protective relay device shown in FIG. 2, the automatic calculation of the protective relay correction program 100, the data input unit 200, the fault current calculation unit 300 and the protective relay correction unit (400).

The data input unit 200 includes a power system drawing unit 220 and a simulation data input unit 240, and the fault current calculation unit 300 includes a fault current simulator 320 and a result value output unit 330.

5 is a flowchart illustrating the overall operation of the setting unit 540 in the protective relay device shown in FIG. 2.

The overall operation of the setting unit 540 in the artificial intelligence-based automatic calculation protection relay device according to the present invention will be briefly described with reference to FIGS. 3 and 5 as follows.

When data on the device to be protected is collected (S100), the data input unit 200 draws a power system to the automatic calculation program 100 for correcting the protection relay and inputs the data (S200).

When a protection relay is added to the drawn power system at the corresponding position (S220), the protection relay correction automatic calculation program 100 recognizes the power element around the protection relay and automatically determines the device to be protected (S240).

The fault current calculation unit 300 executes the protection relay correction automatic calculation program 100 (S300) to calculate the fault current and derive a result value (S400).

The protection relay correction unit 400 corrects the protection relay parameters according to the preset correction criteria and the fault current calculated by the failure current calculation unit 300 (S500), and prepares a protection cooperation curve and a protection relay correction table (S600). .

The setting unit 540 is equipped with a protection relay correction automatic calculation program 100 to automatically set the setting parameter value (S700), and if there is a power system accident among a plurality of devices (not shown) (S800), It analyzes the accident in conjunction with the artificial intelligence unit 600 and generates a trip signal to the circuit breaker of the corresponding device (S900).

FIG. 4 is a block diagram showing the internal components of the protection relay correction unit 400 in the protection relay device shown in FIG. 3, a data organizing unit 410, a correction reference setting unit 420, and a protection disconnection diagram preparation unit 430 ), A protection relay parameter calculation unit 440, a protection cooperation review unit 450, a protection relay correction table preparation unit 460, and a final book preparation unit 470.

The configuration and function of the protection relay correction unit 400 in the protection relay device for automatic calculation of artificial intelligence-based correction values according to the present invention will be described with reference to FIGS. 3 and 4 as follows.

The data organizer 410 receives the data collected by the user and organizes it into data for correcting the protective relay.

The correction standard setting unit 420 receives the summarized data from the data organizing unit 410 and sets correction criteria of parameters for calculating settings for each correction type of the protection relay.

The protection disconnection diagram preparation unit 430 receives the correction criteria set by the correction reference setting unit 420 and prepares the installation position, equipment rating, and protection element of the protection relay device for each correction type of the protection relay in a drawing.

The protection relay parameter calculation unit 440 receives the drawings created by the protection single-line diagram creation unit 430 and automatically sets the correction relay parameter values according to the correction type according to the manual of the protection relay.

The protection cooperation review unit 450 extracts the protection cooperation curve using the protection relay parameter value calculated by the protection relay parameter calculation unit 440 of the protection relay selected from the protection relays.

The protection relay correction table preparation unit 460 creates a document by tabulating parameters required for setting based on the protection relay parameter values calculated by the protection relay parameter calculation unit 440.

FIG. 6 is a table of data items and parameters of the device to be protected collected in operation S100 during operation of the protection relay device shown in FIG. 5.

7 is a distribution diagram of the fault current calculated in step S400 during operation of the protective relay device shown in FIG. 5.

The operation of the artificial intelligence-based automatic calculation protection relay device according to the present invention will be described in detail with reference to FIGS. 2 to 7 as follows.

During the protection relay correction procedure, data acquired through data collection is arranged, and data is input by drawing a power system in the automatic calculation program 100 for correcting the protection relay.

When the protection relay correction automatic calculation program 100 is executed, the optimal parameter setting value is selected by self-calculation inside the program, and a protection relay correction calculation document is produced.

The algorithm of the automatic calculation of the protection relay correction program 100 is as follows.

First, in the program input method, a plurality of elements (not shown) of the power system (back system, power transmission line, power distribution line, transformer, synchronous generator, electric motor, bus, etc.) are symbolized graphically.

In addition, after the user clicks the required symbol and moves it into the schematic window area, the devices are connected to each other by lines by self-performance of the automatic correction program for the protection relay correction (S330), CT (current transformer for the instrument) In this case, it is connected so that polarity determination can be recognized.

Click on each power system element on the screen to input or select the required power system data.

At this time, the power system data includes a system configuration state, a transformer capacity, a transformer wiring method, a transformer specification and grounding method, a generator specification and grounding method, and a system operating method.

Configure the setup window to include “Settings required for calculating the fault current” and “Settings required for calculating the protective relay correction”.

The fault current calculation is based on IEC 60909 and ANSI C37 Std. By selecting one of the specifications, the equation of the fault current calculation process applied according to the selected specification is algorithmized internally in the program and calculated by itself.

For example, according to the duration of the failure, “one-line ground fault / line-to-line short-circuit / three-phase short-circuit fault current”.

For each selected protective relay, the required value of the setting parameter, that is, the optimum value is derived.

That is, according to the protection relay model, the setting parameters are classified, the setting parameters are calculated internally by algorithmizing the equation of the calculation process internally in the program, and the optimal setting value is derived by comparing and analyzing the protection curve.

As an embodiment, a detailed description of a process for deriving setting parameters for overcurrent protection of a low voltage power system and setting parameters for impedance type power system protection of a generator protection relay will be described later.

The protective relay correction statement document includes the protective relay correction criteria, the protection disconnection diagram, the detailed calculation details of the protective relay setting parameters, the protection relay correction table, the protection cooperation curve, and the fault current statement.

As an embodiment, a detailed description of the protection relay correction table, the protection cooperation curve, and the fault current calculation will be described later.

8 is a graph of the protection coordination curve created in step S600 during operation of the protection relay device shown in FIG. 5.

9 is a protection relay correction table prepared in operation S600 during operation of the protection relay device shown in FIG. 5.

The operation of the artificial intelligence-based automatic calculation protection relay device according to the present invention will be described in detail with reference to FIGS. 2 to 9 as follows.

1. Data collection

Data is collected by the user for fault current calculation of the equipment to be protected and correction of the protective relay.

The items of data necessary for calculating the fault current and correcting the protective relay are the back grid bus impedance, the transmission (distribution) line impedance, the transformer, and the synchronous generator, and the parameters for these are shown in the table in FIG. 6.

2. Fault current calculation

The fault current calculation is performed by simulating the power system data acquired in the data collection step using a commercial simulation program widely used at present.

The fault current calculation is performed in the order of “Power system drawing” → “Data input” → “Failure current simulation” → “Acquisition of result value”.

The power system drawing unit executes the program to arrange each individual element according to the power system situation, i.e., various operating conditions of the power system including power generation and substation, transmission and distribution facilities, and then connects them to each other.The protection relay and CT (current transformer for the instrument) ) And PT (instrument transformer) are also drawn.

The simulation data input unit 240 inputs various simulation data necessary for simulation of a fault current to each of a plurality of devices (not shown).

When the user selects the selection function of the program setup window as needed, the fault current simulator 320 executes the program to calculate the fault current by itself.

When the fault current simulation is completed in the fault current simulator 320, the result value output unit 330 outputs various reports and fault current distribution maps according to user requirements.

The result of the fault current required for correcting the protective relay needs separate data arrangement to be described later.

3. Prepare a protective relay correction statement

The task of preparing the protective relay correction statement is “organization of data” → “preparation of corrective criteria” → “preparation of protection disconnection diagrams” → “calculation of protection relay parameters” → “preparation of protection cooperation curve and review of protection cooperation” → “preparation of protection relay correction table” → Proceeds in the order of “writing and reviewing the final book”.

The data organizing step is the first step for correcting the protective relay, and the data organizing unit 410 organizes data on the device to be protected provided by the user as necessary data for correcting the protective relay.

At this time, the data to be sorted are the data necessary for correcting the protective relay for each device to be protected, the result of fault current calculation, the manufacturer and model data of the protective relay, the current transformer (CT) and the transformer (potention transformer, PT). Information, etc.

Here, the current transformer for the instrument converts a large current of high voltage into a small current of 1A or 5A required by the instrument or relay, and the instrument transformer has a large capacity and is unlike a typical transformer used for power in power or equipment. The capacity is small because it is used only as a power source for instruments and relays.

The correction reference setting unit 420 sets correction criteria of main parameters for calculating settings for each correction type of the protective relay.

In particular, regarding the overcurrent relay and ground fault overcurrent relay, the protection cooperation time is selected in consideration of the upper and lower protection cooperation.

The protection single-line drawing unit 430 allows the user to easily understand the protection relay device for each protection relay correction type (type), such as a bus, a current transformer (CT), a transformer (PT), and a circuit breaker ( CB), the installation location of the equipment to be protected, the equipment rating, and the protection elements shall be prepared in the drawings.

Since the setting parameters required for each manufacturer and model of the protective relay are all different, the protective relay parameter calculating unit 440 automatically sets each type according to the manual of the protective relay to calculate the protective relay parameter value.

However, this process was a process in which a power system technician had to manually perform a manual calculation using a calculator and typed the calculation process and results, so that there was a high possibility of errors in the process.

However, the artificial intelligence-based correction value automatic calculation protection relay device according to the present invention minimizes correction errors since the program performs itself when the user correctly checks only the data input to the protection relay correction automatic calculation program 100. It becomes possible.

The protection cooperation review unit 450 uses the protection relay parameter result values calculated by the CT and PT ratios and the protection relay parameter calculation unit 440 according to the manufacturer and model of the protection relay selected from among the protection relays. Extract the cooperative curve.

Since this process also requires that the power system engineer manually input the calculation result calculated in the detailed calculation step of the protection relay parameter into the program manually and extract the necessary protection coordination curve, there is a high possibility of an error in the manual input process. It was a process that required a high degree of professionalism that a technician performing protection cooperation should have extensive knowledge of the dynamic characteristics of the power system as well as deep expertise on the operating characteristics of each protective relay.

However, the artificial intelligence-based correction value automatic calculation protection relay device according to the present invention, when the user inputs only the data necessary for the correction of the protection relay, the artificial intelligence unit 600 automatically calculates the protection relay setting and automatically sets it.

In addition, the artificial intelligence unit 600 checks the adequacy of the setting value by securing real-time data for each device to be protected, thereby preventing malfunction of the protection relay.

For example, when the protection relay is a transformer protection relay, the artificial intelligence unit 600 analyzes the characteristic of the inrush current generated during pressurization to determine the appropriateness of the setting value of the protection element.

If, when the artificial intelligence unit 600 refers to the big database and determines that the setting value of the corresponding protection element generated during pressurization in the transformer protection relay is not appropriate, it is necessary to automatically change the setting value of the protection element internally. Change it to notify the user.

Here, the exciting inrush current means a large shock current that flows instantaneously when one of the primary and secondary terminals of the transformer is opened (no load) and a voltage is applied to the other terminal, whose magnitude is the applied voltage. It depends on the phase and the residual magnetic flux of the transformer core, and sometimes a current that is 8-10 times larger than the rated current flows.

When the protective relay is a motor protective relay, the starting characteristics are analyzed at every start of the motor to determine the appropriateness of the setting value of the corresponding protection element.

If, when the artificial intelligence unit 600 refers to the big database and determines that the setting value of the corresponding protection element generated at each start-up in the motor protection relay is not appropriate, it is necessary to change the internally automatically. Change it to notify the user.

As described above, the artificial intelligence-based correction value automatic calculation protection relay device of the present invention minimizes the possibility of malfunction of the protection relay through real-time setting value adequacy check.

On the other hand, the artificial intelligence based automatic calculation protection relay device of the present invention performs smart system failure protection management by utilizing the big database 700 of various system accidents.

That is, by using the actual failure waveform and the electromagnetic transient analysis program (Electro-Magnetic Transients Program, EMTP), the failure current is simulated to obtain the failure accident waveform for each failure case.

Here, the electromagnetic transient analysis program is a simulation program for mathematical calculations developed to analyze the transients of the power system, and it is also possible to analyze the steady state and harmonics, and characterize the equipment and equipment.

The acquired accident waveform is stored in the non-volatile storage device of the protective relay in the ROM 532 (ROM), and the failure analysis unit 534 utilizes the accident waveform when an accident occurs in the protective relay stored in the ROM 532 (ROM). Failure analysis is performed automatically.

That is, when operating a power facility based on the stored fault accident waveform, when detecting a fault accident waveform of a similar pattern, it is recognized as the same accident using big data and recognized as an accident regardless of the setting value and generates a trip signal. .

On the other hand, if a failure occurs, a large voltage drop occurs at the busbar connected to the failure point due to the inflow of large current, so the operation time must be determined so that the effect of the equipment in operation is minimized.

In addition, conventionally, "overcurrent (50/51) / ground fault overcurrent (50G / 51G or 50N / 51N) / 49 / 51LR / 48" may be graphed using a commercial program, but the remaining protection elements (21 / 24/40/46/78/81/87, etc.) If a protection coordination curve is required, the engineer should design and express the graph.

However, the artificial intelligence-based correction value automatic calculation protection relay device according to the present invention includes not only the "overcurrent (50/51) / ground fault overcurrent (50G / 51G or 50N / 51N) / 49 / 51LR / 48" protection element, Even the rest of the protection elements (21/24/40/46/78/81/87, etc.) can be graphed using the protection relay correction value automatic calculation program (100) and artificial intelligence (600) when a protection coordination curve is required. There will be.

The protection relay correction table preparation unit 460 creates a document by tabulating the parameters required for setting based on the protection relay parameter values calculated by the protection relay parameter calculation unit 440.

The final book preparation unit 470 collects and outputs all the results generated while proceeding from the data arrangement step to the protection relay correction table preparation step.

As described above, conventional procedures require a lot of effort, cost, and time of the technical personnel of the electric power system because it requires many procedures as described above for data collection, fault current calculation, and protection relay correction calculation to set the protective relay. Did.

However, when the artificial intelligence-based correction value automatic calculation protection relay device according to the present invention is used, the protection relay correction value automatic calculation program 100 and the artificial intelligence unit 600 perform the protection relay correction calculation and correction calculation work. Not only can the time and cost be drastically reduced, but it is also possible to minimize protection relay correction errors, prevent malfunction of the protection relay, and prevent various power system accidents.

Derivation of setting parameters for overcurrent protection of low voltage power systems

Referring to Figures 2 to 9 will be described in detail the partial operation in one embodiment of the process for deriving the setting parameters for the over-current protection of the low-voltage power system in the artificial intelligence-based automatic correction protection relay device according to the present invention in detail As follows.

First, the basic information of the main protection (Incoming Protection) is as follows.

The user enters the rated capacity, rated voltage and angular displacement of the transformer.

As the lower relay correction data, the current transformer is input by the user, and the threshold current, characteristic curve type and time dial are automatically calculated or input by the user.

The current ratio of the current transformer can be input by the user or automatically calculated.

For example, for a bus three-phase short-circuit fault current, Ik = 37.870 [kA] is obtained at a simulation result of 0.46 [kV].

The settings for overcurrent protection are as follows.

The detection method of overcurrent protection is automatically selected or input by the user, and is corrected by a fundamental component as a factor for setting the current detection method as a correction criterion.

The threshold current setting is automatically calculated, and is corrected to 125% of the rated current of the transformer as a correction standard.

For example, if the rated current of the transformer is 3,137.8 [A], the threshold current is corrected to 3,137.8 x 1.25 x 5 / 4,000 = 4.90 [A] as a correction criterion.

The protection coordination curve setting is automatically selected or input by the user. As the correction standard, the curve that is most suitable for coordination with the upper and lower protection relays is selected.

For example, it is automatically selected or input by the international electronical committee (IEC) as an extraordinarily inverse as a protection coordination curve, and the reset setting is automatically selected. Drop-out Type) is set to 'instantaneous' to return to instantaneous.

The time dial (TD) setting is automatically calculated or input by the user, and as a reference for correction, it cooperates with the potential and the lower protection relay in the three-phase short circuit current value of the busbar.

이며, 시간 다이얼은 다음과 같은 수학식 1을 이용하여 정정한다.For example, when correcting the three-phase short circuit current (Ik) to operate at 0.7sec at 37.87 [kA], as a correction criterion

The time dial is corrected using Equation 1 below.

[Equation 1]

The protection coordination time verification is automatically calculated or input by the user. As a correction standard, verify that the minimum protection coordination time of the upper and lower protection relays is 0.25 [Sec] or higher in the three-phase short-circuit current value of the busbar.

이며, 하위 보호 계전기의 동작 시간은 다음과 같은 수학식 2를 이용하여 정정한다.For example, as a correction criterion for a lower protective relay

Is, and the operation time of the lower protection relay is corrected using Equation 2 below.

[Equation 2]

Here, TD means a time dial that is automatically calculated or input by a user in the time dial current setting step.

이며, 현재 보호 계전기 동작 시간은 다음과 같은 수학식 3을 이용하여 정정한다.In addition, as a correction standard for current protective relays

The current protection relay operating time is corrected using Equation 3 below.

[Equation 3]

Here, TD means a time dial that is automatically calculated or input by a user in the time dial current setting step.

As shown in Equation 3, the time coordination of the current protection relay and the lower protection relay is the operating time (0.3985 sec) of the lower protection relay calculated by Equation 2 and the current protection relay operating time calculated by Equation 3 ( It was confirmed that the protection coordination is sufficient as the minimum protection coordination time of the upper and lower protection relays is 0.25 [Sec] or more, as a difference value of 0.6946 (sec.

Generator protection relay Impedance power system setting protection parameters

Partial operation in one embodiment of the process of deriving setting parameters for the generator protection relay impedance type power system rear protection in the automatic relay for artificial intelligence-based correction value protection relay device according to the present invention with reference to FIGS. 2 to 7 and 9 The details are as follows.

First, the basic information of generator protection is as follows.

The user inputs the generator's rated voltage, rated apparent power, allowable current, power factor, rated frequency and reactance.

The generator neutral side current transformer of the current transformer and the transformer for the instrument side of the generator circuit breaker are input by the user or automatically calculated.

, 0.3-W, X, Y로 입력된다.For example, the generator neutral side current transformer of the current transformer is input to 13,000 / 5 [A], C400, and the generator side instrument transformer of the generator breaker is

, 0.3-W, X, Y.

Generator protection relay The settings for the protection of the impedance type power system are as follows.

The loop selection setting is automatically selected or input by the user, and is used to protect the short circuit after the generator as a correction criterion, so it is corrected to the recommended value of the relay manufacturer.

 The over current limit setting is automatically calculated or input by the user, and is corrected to 125% of the rated current of the generator as a correction standard.

For example, when the rated current of the generator is 11,098 [A], the overcurrent limit value is corrected as 11,098 x 1.25 x 5 / 13,000 = 5.335 [A] as the correction standard.

The undervoltage sealing setting is automatically calculated or input by the user, and is corrected to 80% of the rated voltage of the generator as a correction standard.

For example, when the rated voltage of the generator is 18 [kV], the sealing voltage is corrected using Equation 4 below as a correction criterion.

[Equation 4]

The undervoltage duration setting is automatically calculated or input by the user, and is corrected to operate later than the maximum operating time (Zone-2) as a correction criterion.

For example, when the maximum operation time (Zone-2) is 2.5 [sec], the sealing duration as a correction criterion is corrected to the area (Zone-2) operation time (2.5 sec) + 0.5 sec = 3.00 [sec] .

The Zone-1 reactance reach (Ph-Ph) setting is automatically calculated or entered by the user, and is corrected to 70% of the main transformer impedance as a correction criterion.

For example, when the main transformer impedance is 27% based on 540 MVA, correction is made using Equation 5 below.

[Equation 5]

Here, in order to convert to the secondary side of the transformer and current transformer for the instrument, it is corrected by using the following equation (6).

[Equation 6]

Where Z _prim is the primary impedance of the instrument transformer and current transformer.

The Zone-1 resistance reach (Ph-Ph) setting is automatically calculated or input by the user, and is corrected to 50% of the reactance reaching value as a correction criterion.

The reference resistance of the secondary side of the transformer and current transformer for the instrument is corrected by using Equation 7 below.

[Equation 7]

Where Z _sec is the secondary impedance of the instrument transformer and current transformer.

The Zone-1 directional mode setting is automatically selected or input by the user, and is corrected to a non-directional type recommended by the relay manufacturer as a correction standard.

The Zone-1 operating time delay setting is automatically calculated or input by the user. Since Zone-1 is for generator back protection, correct the operating time delay to operate at 0.3 sec.

On the other hand, the setting of the Zone-2 reactance reach (Ph-Ph) is automatically calculated or input by the user. As a correction standard, the impedance value corresponding to 150% of the generator output and the main transformer (Main step-up) TR) Impedance x 100% + Next longest line impedance x Correct it to the smaller of the apparent coefficient values.

For example, the impedance value corresponding to 150% of the rated power of the generator is corrected using Equation 8 below.

[Equation 8]

In addition, the main transformer impedance x 100% + the next longest line impedance x apparent coefficient value is corrected by using Equation (9) below.

[Equation 9]

Here, Z _L is the next longest line impedance, and is calculated using Equation 10 below.

[Equation 10]

Z _L = 0.1358 x 0.43 x (18/345) ²

In addition, K is an apparent coefficient, calculated with reference to the fault current distribution diagram shown in FIG. 7, and calculated using Equation 11 as follows.

[Equation 11]

A detailed description will be given with reference to a part (A) of the fault current distribution diagram shown in FIG. 7 as follows.

The fault current distribution is a fault current distribution obtained after simulation of a fault current by using a commercial program E-TAP, and the part indicated by “A” will be described as an example.

“Bus12” indicates a point of failure and indicates a virtual accident point, and “345 kV” indicates the rated voltage of the busbar.

When a three-phase short circuit accident occurs at Bus 12, “↓ 27.485 kA” indicates the fault current contributing from the system (KEPCO S / S), and “↑ 2.928kA” contributes from the generators (GT4, ST2) installed in the premises of the power plant. Indicates the fault current.

In addition, 30.413 kA is the fault current, which is the sum of the power system contribution and the power generation contribution installed in the premises of the power plant, that is, "↓ 27.485 kA + ↑ 2.928 kA = 30.413 kA".

On the other hand, the main transformer impedance x 100% + the next longest line impedance x apparent coefficient value is corrected using Equation 12 below.

[Equation 12]

Accordingly, the correction criterion for the Zone-2 reactance reach (Ph-Ph) setting is the main step-up TR impedance less than the impedance value corresponding to 150% of the generator output x 100 % + Next longest line impedance x apparent coefficient is applied and corrected using Equation 13 below.

[Equation 13]

The Zone-2 resistance reach (Ph-Ph) setting is automatically calculated or input by the user, and is corrected to 50% of the reactance arrival value as a correction criterion.

The secondary resistance value of the transformer and current transformer for the instrument is corrected by using Equation 14 below.

[Equation 14]

Where Z _sec is the secondary impedance of the instrument transformer and current transformer.

The Zone-2 directional mode setting is automatically selected or input by the user, and is corrected to a non-directional type recommended by the relay manufacturer as a correction standard.

Zone-2 operating time delay setting is automatically calculated or input by the user. Since Zone-2 is for protecting the transmission system after transmission, it is more than 100 cycles (1.667sec), which is the operating time of Zone-3 of the transmission line protection relay. Correct the operation time delay to operate at 2.5 sec.

8 is a graph of the protection coordination curve created in step S600 during operation of the protection relay device shown in FIG. 5.

The protection coordination curve illustrated in FIG. 8 will be described in detail as follows.

The protection coordination curve of FIG. 8 is an example in which the overcurrent protection element 50/51 is prepared by utilizing the PTM commercial program of SKM, and the horizontal axis of the graph represents the current value and the vertical axis represents time.

① shows the protection disconnection diagram that is displayed so that the user can easily understand and judge the protection cooperation curve.

② indicates the thermal limit curve of the transformer. An example of protection coordination is the “L / C TR-01” transformer.

③ indicates the maximum fault current at the point where the protective relay is installed, and the fault current calculation result is used.

④ is the protection coordination curve based on the 50/51 factor setting value of each protection relay. Currently, the result of the correction calculation of the protection relay (pickup value, curve type, time multiplier, etc.) must be input to the commercial program. The protection coordination curve is displayed.

In addition, for each protection relay, the contents of the square box of the left arrow indicate CT (current transformer current) rating information, the manufacturer and model name of the protection relay, and the set value of each protection relay.

Table 1 below shows the IEC protection coordination curve applied in general.

IEC curve types Characteristic formula Normal Inverse (Type A)

Very Inverse (Type B)

Extremely Inverse (Type C)

Long Inverse (Type D)

In the characteristic formula of Table 1, t is the operating time [sec], T _P is the time multiplier setting value, I is the fault current [A], and I _P is the pickup current setting value.

9 is a protection relay correction table prepared in operation S600 during operation of the protection relay device shown in FIG. 5.

A brief description of a part of the protection relay correction table shown in FIG. 9 is as follows.

Based on the result of the correction calculation or the rating and connection information of the CT (instrument current transformer) and PT (instrument transformer), power system information, etc., a professional technician selects and records the value corresponding to the “Value” column of the correction table.

Fault current calculation

FIG. 10 is a table showing the results of the first embodiment of the simulation of calculating the fault current during operation of the protective relay device shown in FIG. 5.

11 is a table showing the results of the second embodiment of the simulation of calculating the fault current during operation of the protective relay device shown in FIG. 5.

Calculation of the fault current is simulated in consideration of various situations in which the power system can be operated, and then tabulation is performed so that the obtained results can be applied for correction of the protective relay.

Because the power system is complex, a commercial program is used to simulate the fault current to obtain the result.

When calculating the protective relay correction value, the 50/51 element uses the 3-phase short-circuit current result, and the 51G element uses the 1-line ground-current result.

In general, the 3-phase short-circuit current result and the 1-line ground-fault current result of the power system are calculated and utilized in the following matters.

These include circuit breaker breaking capacity, mechanical strength and rating determination of power equipment, protection relay correction and protection coordination, communication induction disturbance, system configuration, and effective grounding conditions, and operation of the Y connection neutral point on the primary side of the transformer.

The first embodiment of the fault current calculation simulation is for normal operation of a commercial generator, and the simulation conditions are as follows.

The generator is in normal operation at 13.8 kV, 37 MW, and the internal load is supplied to the secondary auxiliary transformer.

In addition, in the 6.6 kV power system, the bus-tie circuit breaker is in the 'closed' state, the 154 kV breaker for the starting transformer load is in the 'open' state, and the 'system is disconnected'.

The tap positions of all step-up and step-down transformers are applied to the 'middle position', so all 6.6 Kv high-voltage motors are in full load operation except for standby.

For the pre-fault voltage factor, the Cmax value suggested in the IEC_60909 standard was applied.

Based on the simulation conditions, the simulation results of failure current calculation for normal operation of a commercial generator are shown in FIG. 10.

The second embodiment of the fault current calculation simulation relates to the power supply by the starting transformer when the commercial generator is stopped, and the simulation conditions are as follows.

The generator is 13.8 kV, 37 MW, and the operation is stopped, and the internal load is supplied to the starting transformer.

In addition, in the 6.6 kV power system, the bus-tie circuit breaker is in the 'closed' state, and the main transformer for boosting is 154 kV, the circuit breaker is 'open', and the main transformer for boosting, commercial generators, and auxiliary transformers for all components are 'system'. Separated.

The tap positions of all step-up and step-down transformers are applied to the 'middle position', so all 6.6 Kv high-voltage motors are in full load operation except for standby.

For the pre-fault voltage factor, the Cmax value suggested in the IEC_60909 standard was applied.

Based on the simulation conditions, the simulation result of the fault current calculation for the power supply by the starting transformer when the commercial generator is stopped is shown in FIG. 11.

As described above, the present invention automatically controls the artificial intelligence unit to process the protection relay setting and automatically sets it when the user inputs only the necessary data to correct the protection relay, and manages smart system failure protection by utilizing a big database of various power system accidents. It provides an artificial intelligence-based correction value automatic calculation protection relay device to perform the.

Through this, the artificial intelligence unit internally calculates and processes the data necessary for correcting the protective relay input by the user, and automatically checks the adequacy of the setting values for each protected device, minimizing the error in correcting the protective relay, It is possible to prevent malfunction.

In addition, when a power system accident occurs in a predetermined device among a plurality of power devices, the power system accident of the corresponding device is analyzed and a big database is monitored and controlled by referring to the data on the failure event case waveform in conjunction with the big database. Therefore, it is possible to prevent various power system accidents.

As described above, although various preferred embodiments of the present invention have been described with some examples, descriptions of various various embodiments described in the “Details for Carrying Out the Invention” section are merely illustrative, and the present invention Those of ordinary skill in the art to which they belong will understand well that from the above description, various modifications of the present invention can be carried out or equivalent practice of the present invention.

In addition, since the present invention can be implemented in various other forms, the present invention is not limited by the above description, and the above description is intended to make the disclosure of the present invention complete, and it is common in the technical field to which the present invention pertains. It should be understood that the present invention is only provided to those who have knowledge of the present invention, and the present invention is only defined by each claim of the claims.

100: Automatic calculation program for the protection relay correction
200: data input unit
220: power system drawing unit
240: simulated data input unit
300: fault current calculation unit
320: fault current simulator
330: result output unit
400: protection relay correction unit
600: artificial intelligence
700: Big database

Claims (13)

An input converting unit that receives input information from the instrument current transformer and the instrument transformer and converts the data into a plurality of protective relay data;
An input unit for receiving the converted data for the plurality of protective relays, filtering and encoding, and temporarily storing the encoded data;
A data processing unit that analyzes a power system accident of the corresponding device by referring to the temporarily stored data as a failure event case waveform data for a device in which a power system accident occurs among a plurality of devices;
A setting unit that is equipped with an automatic calculation program for the correction of the protective relay, automatically receives the data about the collected equipment to be protected, and automatically sets the setting parameter value, and determines in real time whether the automatic setting parameter value is appropriate when the power facility is operated. ;
An output interface for receiving a contact from the outside or outputting a blocking signal by configuring a protection element operation output as logic; And
A communication unit communicating with the plurality of protection relays and transmitting the automatically set setting parameter value;
Equipped with,
The plurality of elements
Characterized in that it includes a rear system, a transmission line, a distribution line, a transformer, a synchronous generator, an electric motor and a busbar,
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 1,
The input unit
A plurality of filters for receiving low-pass filtering by receiving the converted data for the protective relays;
A plurality of sampling holders receiving the filtered data for a plurality of protective relays and dispensing in synchronization with a sampling pulse clock;
A multiplexer for receiving and encoding the divided plurality of protective relay data;
An AD converter that receives the encoded protective relay data and converts it into digital data; And
A buffer for receiving and temporarily storing the converted digital data;
Characterized in that it comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
According to claim 2,
The data processing unit
A ROM that receives the temporarily stored data and interoperates with a big database to store failure event case waveforms as big data; And
A failure analysis unit that analyzes the power system accident of the corresponding device with reference to the stored failure event case waveform data in conjunction with an artificial intelligence unit for the corresponding device where the power system accident has occurred;
Characterized in that it comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
According to claim 2,
The input unit
An input interface receiving the contact input and transmitting the corresponding device having the power system accident to the output interface to generate the blocking signal;
Characterized in that it further comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 3,
The artificial intelligence unit
Characterized in that, by determining the setting parameter value of the selected device to be protected in real time, if it is determined that a change is necessary, the protection element setting value of the corresponding protection relay is automatically changed.
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 3,
The artificial intelligence unit
The actual failure waveform or the result of the simulation of the fault current using an electromagnetic transient analysis program stores the failure accident waveform for each failure case in the ROM, and when the power equipment is operated, a failure accident waveform having a pattern similar to the stored failure accident waveform is generated. Characterized in that when recognized, characterized by the same accident,
Artificial intelligence-based correction value automatic calculation protection relay device.
delete According to claim 1,
The setting part
A data input unit that inputs data by drawing single-line diagrams for a plurality of elements of a power system in the automatic calculation program for correcting the protection relay when data on the device to be protected is collected;
A fault current calculation unit that calculates a fault current by executing the automatic calculation program for correcting the protection relay; And
A protection relay correction unit for correcting a protection relay parameter according to a preset correction criterion and the calculated fault current, and preparing a protection cooperation curve and a protection relay correction table;
Equipped with,
The protection relay correction automatic calculation program is characterized in that when the protection relay is added to the corresponding position in the drawn single-line diagram, the device around the protection relay is recognized to automatically determine the device to be protected.
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 8,
The data input unit
A power system drawing unit that executes the automatic calculation of the correction of the protective relay to arrange the plurality of elements according to the operation state of the power system, draws the single-line diagram, and connects the plurality of elements with lines; And
A simulation data input unit for inputting simulation data necessary for a fault current simulation to each of the plurality of devices;
Characterized in that it comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 9,
The fault current calculation unit
A fault current simulator that receives the simulation data and executes the automatic calculation program for correcting the protection relay according to a selected setting parameter value of the device to be protected to calculate the fault current; And
A result value output unit for outputting a fault current distribution for the calculated fault current;
Characterized in that it comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 8,
The protection relay correction unit
A data arranging unit that receives data on the collected equipment to be protected and organizes the data for correction of the protective relay;
A correction criterion setting unit that receives the summarized data and sets the correction criterion of parameters for calculating settings for each correction type of the protective relay;
A protection disconnection diagram preparation unit for drawing the installation position, device rating and protection element of the protection relay device for each correction type by receiving the set correction criteria;
A protection relay parameter calculator configured to receive the created drawings and automatically set each correction type according to a manual of a protection relay to calculate a value of the protection relay parameter;
A protection cooperation review unit for extracting the protection cooperation curve by using the calculated value of the protection relay parameter of the protection relay selected from the protection relays; And
A protection relay correction table preparation unit for preparing the protection relay correction table by tabulating parameters necessary for setting based on the calculated protection relay parameter value;
Characterized in that it comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
The method of claim 11,
The protection relay correction unit
Create a final book that collects, documents and prints out the results generated by the data organizer, the correction criteria setting unit, the protection disconnection diagram preparation unit, the protection relay parameter calculation unit, the protection cooperation review unit, and the protection relay correction table preparation unit part;
Characterized in that it further comprises,
Artificial intelligence-based correction value automatic calculation protection relay device.
An input converting unit that receives input information from the instrument current transformer and the instrument transformer and converts the data into a plurality of protective relay data;
An input unit for receiving the converted data for a plurality of protective relays, filtering and encoding, and temporarily storing the encoded data;
A data processing unit that analyzes a power system accident of a corresponding device by referring to the temporarily stored data as a failure event case waveform data for a device in which a power system accident occurs among a plurality of devices;
A setting unit that is equipped with an automatic calculation program for correcting the protective relay, receives data about the collected equipment to be protected, automatically sets the setting parameter value, and determines in real time whether or not the automatically set setting parameter value is appropriate when the power facility is operated. ;
An output interface for receiving a contact from the outside or outputting a blocking signal by configuring a protection element operation output as logic; And
A communication unit communicating with the plurality of protection relays or portable terminal devices and transmitting the automatically set setting parameter value;
Equipped with,
Using the Internet of Things to obtain the operation status information of the real-time power system of the plurality of devices to control the operation state of the power system of the plurality of devices,
The plurality of devices
Characterized in that it includes a rear system, a transmission line, a distribution line, a transformer, a synchronous generator, an electric motor and a busbar,
Artificial intelligence-based correction value automatic calculation protection relay device.

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