KR20150022200A - System and method for monitoring and diagnosis of power device - Google Patents

Abstract

Provided are an electric power facility diagnosing system and a method thereof. The electric power facility diagnosing system comprises a database storing a plurality of ultrasonic signals classified by fault type such that the ultrasonic signals are matched to hashing values, respectively; an ultrasonic wave sensor unit receiving a first ultrasonic wave signal generated in an electric power facility; and a control unit obtaining a hashing value of the first ultrasonic wave signal by applying a hashing function to a plurality of frequency components extracted from the first ultrasonic wave signal, and diagnosing, when a second ultrasonic wave signal having the hashing value as that of the first ultrasonic wave signal is searched from the database, the electric facility on the basis of a fault type corresponding to the second ultrasonic wave signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power equipment diagnosis system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power equipment diagnosis system and method thereof, and more particularly, to a system and method for diagnosing an ultrasonic power facility by a hashing technique.

During the power transfer process, a high-pressure wave (60 Hz) energy passes through the power plant. In this process, insulation resistance of electric equipment such as electric wire, switch, and loosening of connection point can cause electric power leakage of power equipment. In addition, a power leakage phenomenon may cause a slight vibration in a power plant. Such microvibration occurs in various bands ranging from the voice band to the high-frequency band, and particularly, it occurs in the ultrasonic band (20 KHz to 200 KHz).

Accordingly, in order to diagnose a faulty facility that causes a power leakage phenomenon in a power facility, a technique using an ultrasonic signal generated in a power facility has been proposed.

For example, it is proposed to convert an ultrasonic signal generated from a power facility into an audible frequency that can be heard by a user and transmit the ultrasonic signal to a head set of the operator so that the operator can manually diagnose the equipment fault using his / .

However, this method depends entirely on the operator's five senses and on-site experience. Even ultrasonic signals generated by the same cause can be interpreted differently depending on the equipment that converts the ultrasonic signals into the audible frequency band. In addition, if the diagnosis is continued for a long period of time, there is a danger of causing industrial accidents such as hearing loss to the operator, and safety improvement is also required.

SUMMARY OF THE INVENTION The present invention is directed to a power system diagnosis system and method for minimizing diagnostic errors and real-time system diagnosis.

According to an embodiment of the present invention, a power equipment diagnosis system includes a database for storing hash values corresponding to a plurality of ultrasonic signals classified by a failure type, an ultrasonic sensor for receiving a first ultrasonic signal generated in a power facility, A second hash value of the first ultrasonic signal is obtained by applying a hashing function to a plurality of frequency components extracted from the first ultrasonic signal, and a second ultrasonic signal having a hashing value equal to the hash value of the first ultrasonic signal And a controller for diagnosing the power plant based on a failure type corresponding to the second ultrasound signal when it is retrieved from the database.

According to an embodiment of the present invention, there is provided a method of diagnosing a power equipment, comprising: receiving a first ultrasonic signal generated in a power facility; applying a hashing function to a plurality of frequency components extracted from the first ultrasonic signal, Acquiring a hashing value, retrieving a second ultrasound signal having a hashing value equal to a hashed value of the first ultrasound signal from a database storing a plurality of hash values corresponding to a plurality of ultrasound signals classified by a failure type, And diagnosing the power plant based on a fault type corresponding to the second ultrasonic signal when the second ultrasonic signal is detected.

The power equipment diagnosis system and method disclosed in this document is a system in which ultrasound signals corresponding to each type of failure are converted into a database and the diagnosis of the ultrasound signals generated in the power facility is automatically performed using the database, There is an effect of lowering the diagnostic error probability as compared with the conventional diagnostic method which is dependent on the diagnosis method.

In addition, in the case of an operator having a weak hearing function, safety is secured as compared with the prior art, which is likely to cause industrial disasters such as hearing loss due to continuous diagnosis.

In addition, in the process of database conversion of ultrasound signals as a reference for failure diagnosis, by storing the hashing values of ultrasonic signals as key values, it is possible to reduce the computational complexity in the search process and to enable quick search.

Further, when a new ultrasonic signal is received, it is added to a new database and used for the next diagnosis. As the diagnosis progresses, information as a reference of diagnosis accumulates, and as the diagnosis progresses, the diagnostic accuracy increases.

1 is a structural diagram showing a power equipment diagnosis system according to an embodiment of the present invention.
2 is a diagram for explaining a method of separating a frequency component from an ultrasonic signal.
3 is a diagram for explaining a hashed value obtained from an ultrasonic signal.
4 is a flowchart illustrating a method of diagnosing power equipment according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, the suffix "module" and " part "for constituent elements used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a structural diagram showing a power equipment diagnosis system according to an embodiment of the present invention. FIG. 2 is a view for explaining a method of separating a frequency component from an ultrasonic signal, and FIG. 3 is a diagram for explaining a hashing value obtained from an ultrasonic signal.

Referring to FIG. 1, the power equipment diagnosis system 10 may include a database 11, an ultrasonic sensor unit 12, an input unit 13, an output unit 14, a controller 15, and the like. The components shown in FIG. 1 are not essential, so that the power plant diagnostic system 10 may be implemented to have more or fewer components.

The database 11 can store and manage corresponding ultrasound signals for each failure type. Here, the ultrasonic signal is quantized at a predetermined sampling period (for example, 192 kHz or more), and the data obtained through quantization can be stored in the database 11 as original data corresponding to the ultrasonic signal.

In addition, the database 11 can store and manage the hashed values of the ultrasound signals classified and classified according to the failure type for each ultrasound signal.

In this document, the hashing value of the ultrasonic signal can be obtained by applying a hashing function to a plurality of frequency components constituting the ultrasonic signal.

Hashing is a type of data structure used to store and retrieve data. It means to retrieve the position of data by hashing value obtained by processing the data to be retrieved with a specific function (hashing function).

Hereinafter, a method of acquiring a hashing value from an ultrasonic signal by applying a hashing technique will be described in detail.

Referring to FIG. 2, the power facility diagnosis system 10 may be configured to perform the steps of: extracting frequency components from an ultrasonic signal h (t) expressed in a time domain as shown in FIG. 2 (a) And can be transformed into the frequency domain by applying Fast Fourier Transform (FFT). Through the conversion into the frequency domain, the ultrasonic signal can be represented by a frequency spectrum including a plurality of frequency components f0, fn as shown in FIG. 2 (b).

Then, the power equipment diagnosis system 10 uses the frequency spectrum of the ultrasonic signal to separate the ultrasonic signal into a plurality of frequency signals as shown in FIG. 2 (c), and extracts a plurality of frequency components based on the frequency signals .

Meanwhile, the power equipment diagnosis system 10 may calculate a hashing value by applying a hashing function to a plurality of frequency components extracted from the ultrasonic signal, and use the hashing value as identification information of the ultrasonic signal.

3, the power facility diagnosis system 10 divides the frequency band (20 Hz to 200 KHz) of the ultrasonic signal into a plurality of frequency bands and allocates one or more bits to the divided frequency bands Allocates a memory to the hashing value 101 in the manner described above.

The hashing value can be generated by determining the bit value (0 or 1) allocated to each frequency band depending on whether the ultrasonic signal includes frequency components included in each frequency band.

According to an embodiment of the present invention, the power equipment diagnosis system 10 divides the entire frequency band of the ultrasonic signal into a predetermined number or more of frequency bands, and stores the memory in a hash value corresponding to the number of divided frequency bands It is possible to minimize a collision phenomenon in which identification information of different ultrasonic signals are overlapped. For example, the entire frequency band of the ultrasonic signal can be divided into 256 frequency bands so that the size of a memory (hereinafter referred to as a 'bucket') storing identification information is 32 bytes (256 bits).

According to an embodiment of the present invention, the power equipment diagnosis system 10 includes an upper sideband and a lower sideband among a plurality of frequency components extracted from an ultrasonic signal, It is possible to reduce the memory allocated to the hash value by calculating the hash value using only the frequency components corresponding to either side. In general, original restoration is possible only by the components corresponding to the upper band or lower band among a plurality of frequency components constituting the frequency spectrum. Therefore, the power facility diagnosis system 10 can configure the hashing value using only the frequency components on either side, thereby reducing the memory allocated to the hashing value while minimizing the collision of the hashing value.

Referring again to FIG. 1, the database 11 may store and manage failure type information corresponding to each ultrasonic signal and a guidance message guiding each type of failure.

Table 1 to Table 3 show examples of tables of the hash value, the original data, and the failure type guidance message stored in the database 11, respectively.

Table 1. Bucket Tables

Referring to Table 1, the bucket table may include a SID, a hash value, a description, a message ID, and the like where identification information is stored.

The SID is information indicating a storage location in the table, and is a value indicating where the hashing value of each ultrasonic signal is stored in the table.

The hashing value may be obtained by applying a hashing technique to a plurality of frequency components constituting the ultrasonic signal, which is identification information used for searching each ultrasonic signal.

The description is information on the type of failure of each ultrasonic signal, and may include information as to which fault in each power equipment the ultrasonic signal is generated. For example, it may contain information on the faulty type of power equipment and type of fault, such as faulty insulation of insulators, deterioration of switches, deterioration of electric transformers and transformers .

The message ID may be identification information of a message for guiding a failure content corresponding to each ultrasonic signal, and may include location information indicating where the guidance messages are stored in the message table of Table 3 described later.

Meanwhile, in Table 1, the case where the position information of the guidance message corresponding to each ultrasonic signal is stored in the prefix field of the bucket table has been described as an example, but the present invention is not limited thereto.

Table 2. Original data table

Referring to Table 2, the original data table of each ultrasonic signal may include SID, sampling period, pattern type, pattern data, and the like.

The SID is information indicating the storage position in the table, and is a value indicating in which position in the table the original data of each ultrasonic signal is stored. The SIDs in the original data table of Table 2 can be stored so as to correspond one-to-one with the SIDs of the bucket table of Table 1. [

The sampling period represents a sampling period for obtaining original data from each ultrasonic signal and can be set to include voice bands such as 8 KHz, 16 KHz, 32 KHz, 64 KHz, 128 KHz, 192 KHz, and 384 KHz. In addition, the pattern type represents a pattern type of an ultrasonic signal and can be classified into mechanical, electrical, biological, and chemical pattern types.

The pattern data may include original data obtained by quantizing the ultrasonic signal.

Table 3. Guide Message Table

Referring to Table 3, the guidance message table may include a message ID, a registration date, a registration operator, a message, and the like.

The message ID is information indicating the storage location in the table, and is a value indicating where each guidance message is stored in the message table. The message ID in the message table of Table 3 can be stored so as to correspond one-to-one with the message ID of the bucket table of Table 1. [ Therefore, the power facility diagnosis system 10 can refer to the message ID stored in the bucket table, and it is possible to confirm the position of the message that guides the failure type.

On the other hand, the database 11 is initially set by using ultrasonic signals acquired in advance for each type of failure in the manufacturing process of the power equipment diagnosis system 10, and then the database 11 acquires ultrasound signals newly obtained in the facility diagnosis process Can be updated continuously.

The ultrasonic sensor unit 12 performs a function of receiving an ultrasonic signal from a power facility serving as the target 20.

The input unit 13 receives input data for controlling the operation of the power diagnosis system 10 from an operator. The input unit 13 may include a key pad, a touch pad, a dome switch, a jog wheel, a jog switch, and the like.

The output unit 14 may include display means such as a display and sound output means such as a speaker and a headset as means for generating an output related to visual, auditory, tactile or the like.

The control unit 15 can determine that an abnormality has occurred in the power equipment when an ultrasonic signal of a predetermined gain or higher is inputted through the ultrasonic sensor unit 12. [ In an ideal case, ultrasonic signals do not occur in a power plant operating normally. Accordingly, when an ultrasonic signal smaller than a predetermined gain is input, the controller 15 determines that the power facility is operating normally, and stops the facility diagnosis.

The control unit 15 calculates a hashing value from the ultrasonic signal input through the ultrasonic sensor unit 12 when an abnormality is recognized. Here, the hash value is a value calculated by applying a hashing function to a plurality of frequency components constituting the ultrasonic signal, and is obtained by the method described above with reference to FIG. 2 and FIG.

When the hash value is calculated, the control unit 15 searches the database 11 for a hash value that matches the calculated hash value. That is, the controller 15 searches for an ultrasonic signal having the same hashing value as the ultrasonic signal input from the electric power facility among the ultrasonic signals stored in the database 11.

When the ultrasonic signal having the same hashing value as that of the ultrasonic signal inputted from the electric power facility is retrieved from the database 11, the control unit 15 can check the failure type information corresponding to the retrieved ultrasonic signal from the database 11. Then, based on this, the state of the power equipment is diagnosed. Further, based on the identified fault type information, information for guiding the failure of the electric power facility can be output through the output unit 14. [

The control unit 15 may display a message for guiding the failure and the failure type of the electric power facility on the display or may call the TTS (Text to Speaker) function and output it as a voice signal. The control unit 15 can confirm the storage location of the guidance message from the bucket table in Table 1 described above, read the guidance message from the database 11, and output the guidance message through the output unit 14.

On the other hand, when an ultrasonic signal having the same hashing value as the ultrasonic signal input from the database 11 is not found, the controller 15 converts the inputted ultrasonic signal into an acoustic signal of an audible frequency band. Then, the converted sound signal can be output through the output unit 14. Accordingly, the operator who has confirmed the output sound signal can determine the failure type, input the failure type information and a message for guiding the failure type through the input unit 13.

The controller 15 receiving the failure type information and the guidance message through the input unit 13 newly adds the original data and the hashing value of the ultrasonic signal inputted from the electric power facility to the database 11, Information is stored in association with the newly added ultrasonic signal.

4 is a flowchart illustrating a method of diagnosing power equipment according to an embodiment of the present invention.

Referring to FIG. 4, the power equipment diagnosis system 10 receives an ultrasonic signal generated at a power facility that becomes the target 20 through the ultrasonic sensor unit 12 (S101).

Thereafter, the power equipment diagnosis system 10 calculates a hashing value of the ultrasonic signal received in the step S101 by applying the hashing technique through the control unit 15 (S102). The hash value can be calculated by applying a hashing function to a plurality of frequency components included in the ultrasonic signal, as described above with reference to FIGS.

When the hashed value is calculated, the power facility diagnosis system 10 performs the search of the database 11 using the hash value through the control unit 15. [ That is, the ultrasonic signal having the same hashing value as the ultrasonic signal received in step S101 is retrieved from the database 11 (S103).

If the ultrasound signal having the same hashing value is found in step S103, the power facility diagnosis system 10 reads the failure type information corresponding to the ultrasound signal retrieved from the database 11. [ Then, based on this, the type of failure of the power equipment is determined (S104).

In addition, a guidance message corresponding to the retrieved ultrasonic signal is read from the database 11 and is provided to the operator through the output unit 14 (S105).

If the ultrasonic signal having the same hashing value is not found in step S103, the power equipment diagnosis system 10 transmits the ultrasonic signal received in step S101 through the controller 15 as an acoustic signal of an audible frequency band Conversion. Then, the sound signal of the audible frequency band is output through the output unit 14 (S106).

The operator who confirms the fault type determines the fault type of the electric power facility and inputs a message describing the fault type and fault type to the electric power facility diagnosis system 10 through the input unit 13. Accordingly, the power equipment diagnosis system 10 receives the failure type information and the message of the ultrasonic signal through the input unit 13 (S107).

In addition, the power facility diagnosis system 10 newly adds the ultrasonic signal received in step S101 and the hashed value obtained from the ultrasonic signal to the database 11 (S108). In addition, the failure type information and the message received through step S107 are stored in the database 11 in correspondence with the newly added ultrasonic signal.

According to the embodiment of the present invention described above, the power facility diagnosis system 10 converts the ultrasound signal corresponding to each failure type into a database, and automatically diagnoses the ultrasound signal generated in the power facility using the database , There is an effect of lowering the diagnostic error probability as compared with the conventional diagnostic method which depends entirely on the operator's experience.

In addition, in the case of an operator having a weak hearing function, safety is secured as compared with the prior art, which is likely to cause industrial disasters such as hearing loss due to continuous diagnosis.

In addition, in the process of database conversion of ultrasound signals as a reference for failure diagnosis, by storing the hashing values of ultrasonic signals as key values, it is possible to reduce the computational complexity in the search process and to enable quick search.

Further, when a new ultrasonic signal is received, it is added to a new database and used for the next diagnosis. As the diagnosis progresses, information as a reference of diagnosis accumulates, and as the diagnosis progresses, the diagnostic accuracy increases.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable recording medium and may be configured to play back one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (16)

A database for storing a plurality of hash values corresponding to a plurality of ultrasonic signals classified by the type of failure,
An ultrasonic sensor part for receiving the first ultrasonic signal generated in the electric power facility, and
A second hash value of the first ultrasonic signal is obtained by applying a hashing function to a plurality of frequency components extracted from the first ultrasonic signal, and a second ultrasonic signal having a hashing value equal to the hash value of the first ultrasonic signal, A controller for diagnosing the power plant based on a failure type corresponding to the second ultrasonic signal,
The power plant diagnosis system comprising: The method according to claim 1,
Wherein the control unit allocates at least one bit to a plurality of frequency bands obtained by dividing the entire frequency band of the ultrasonic signal,
And obtains a hashed value of the first ultrasonic signal by setting a value of a bit allocated to the plurality of frequency bands based on the plurality of frequency components. 3. The method of claim 2,
Wherein the hash value of the first ultrasonic signal is obtained by setting an allocated bit to a preset value for a frequency band including a frequency component extracted from the first ultrasonic signal among the plurality of frequency bands. The method of claim 3,
Wherein the plurality of frequency components are frequency components corresponding to upper side bands among frequency components included in the first ultrasonic signal. The method according to claim 1,
Wherein the database stores a plurality of ultrasonic signals corresponding to messages corresponding to the plurality of ultrasonic signals in association with each other. 6. The method of claim 5,
And an output unit for outputting a sound signal,
Wherein the control unit reads a guidance message corresponding to the second ultrasonic signal from the database, converts the guidance message into an acoustic signal, and outputs the acoustic signal through the output unit. The method according to claim 1,
Wherein the control unit adds the hashing value of the first ultrasonic signal and the first ultrasonic signal to the database if an ultrasonic signal having the same hashing value as the first ultrasonic signal is not found. 8. The method of claim 7,
Inputs, and
Further comprising an output unit for outputting the acoustic signal,
Wherein the controller converts the first ultrasonic signal into an acoustic signal of an audible frequency band and outputs the acoustic signal through the output unit when the ultrasonic signal having the same hashing value as the first ultrasonic signal is not detected, And stores the failure type information of the first ultrasonic signal in the database in association with the first ultrasonic signal. A method for diagnosing power equipment of a power equipment diagnosis system,
Receiving a first ultrasonic signal generated in a power facility,
Obtaining a hashing value of the first ultrasonic signal by applying a hashing function to a plurality of frequency components extracted from the first ultrasonic signal,
Retrieving a second ultrasound signal having a hashing value equal to a hashed value of the first ultrasound signal from a database storing a plurality of hash values corresponding to a plurality of ultrasound signals classified by a failure type,
And diagnosing the power plant based on a failure type corresponding to the second ultrasonic signal when the second ultrasonic signal is detected
Lt; / RTI > 10. The method of claim 9,
Wherein the obtaining of the hashing value comprises:
Allocating at least one bit to a plurality of frequency bands that divide the entire frequency band of the ultrasonic signal, and
Acquiring a hashing value of the first ultrasonic signal by setting a value of a bit allocated to the plurality of frequency bands based on the plurality of frequency components
Lt; / RTI > 11. The method of claim 10,
Wherein the hash value of the first ultrasonic signal is obtained by setting an allocated bit to a predetermined value for a frequency band including a frequency component extracted from the first ultrasonic signal among the plurality of frequency bands. 12. The method of claim 11,
Wherein the plurality of frequency components are frequency components corresponding to upper-side bands among frequency components included in the first ultrasonic signal. 10. The method of claim 9,
Reading a guidance message for guiding a failure type corresponding to the second ultrasonic signal from the database, and
Converting the guide message into an acoustic signal and outputting
≪ / RTI > 10. The method of claim 9,
Adding the hashing value of the first ultrasonic signal and the first ultrasonic signal to the database if the second ultrasonic signal is not searched;
≪ / RTI > 15. The method of claim 14,
Wherein the adding comprises:
Converting the first ultrasonic signal into an acoustic signal of an audible frequency band and outputting the acoustic signal,
Receiving the failure type information of the first ultrasonic signal, and
Storing the failure type information of the first ultrasound signal input to the database in association with the first ultrasound signal
≪ / RTI > A recording medium storing a program for executing the method according to any one of claims 9 to 15.

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