KR20240040676A - Diagnosis apparatus using composite sensor for sensing internal abnormal of power equipment - Google Patents

Abstract

The present invention relates to a diagnostic device using a complex sensor for measuring internal abnormalities in power equipment, and includes sensors that measure and image process visual and thermal images of the interior of power equipment, and measure and process arc signals and UHF signals. Complex sensors for complex configuration; And an internal abnormality diagnosis unit for diagnosing and determining an internal abnormality of the power device using the processing result transmitted from the complex sensor and finally transmitting only an abnormal signal; wherein the complex sensor includes left/right A visible image measuring unit to monitor foreign substances and abnormal phenomena occurring inside the power device using a visible image camera capable of monitoring; Abnormal state according to a temperature rise occurring inside the power device using a thermal image camera A thermal imaging unit to check; An arc signal measuring unit for measuring the number of arc occurrences by detecting light generated during partial discharge inside the power device, accumulating it and expressing it as a quantitative value; A UHF signal measurement unit for measuring a UHF signal inside the power device using a UHF sensor; And a main body manufactured in a form that can be sealed and assembled in the inspection window of the power device, and orienting the visible image measurement unit, the thermal image measurement unit, the arc signal measurement unit, and the UHF signal measurement unit toward the inside of the power device; Includes, the visible image camera is a fisheye lens or wide-angle lens capable of monitoring 180 degrees to the left and right, and generates a real image of 180 degrees to the left and right, and the thermal image camera detects heat using infrared rays. It generates a thermal image expressed in different colors depending on the temperature, and the internal abnormality diagnosis unit uses the left and right real images to detect signs of internal abnormality in the power equipment through augmented reality by detecting arc signals and UHF, which are indirect measurement elements. After primary confirmation through band electromagnetic waves, when signs of internal abnormality of the power device are detected, the internal abnormality of the power device can be secondarily confirmed by complex determination of the indirect measurement element and visual confirmation, which is the direct measurement element. Provides status to administrator.

Description

Diagnostic device using a composite sensor for measuring internal abnormalities in power equipment {DIAGNOSIS APPARATUS USING COMPOSITE SENSOR FOR SENSING INTERNAL ABNORMAL OF POWER EQUIPMENT}

The present invention relates to a diagnostic device using a complex sensor for measuring internal abnormalities in power equipment. More specifically, the present invention relates to a diagnostic device that measures and processes visual and thermal images of the interior of power equipment, and measures and processes arc signals and UHF signals. By diagnosing and determining the internal abnormality of a power device using a composite sensor that consists of a complex sensor that processes signals, a complex sensor for measuring the internal abnormality of a power device is used to reliably and quickly determine the internal abnormality of the power device. It concerns diagnostic devices.

Ultra-high voltage power equipment includes gas insulated switchgear (GIS), main transformer (M.Tr), etc., and it is necessary to check for internal abnormalities.

Since these power devices are sealed, any abnormalities are diagnosed through partial discharge and ultrasonic measurements caused by electromagnetic waves in the UHF (500-1500 MHz) band generated by internal coupling. Also, as a sensor for diagnosing partial discharge, internal/external electromagnetic wave sensors, noise sensors, etc. may be used.

In general, the determination of abnormality based on electromagnetic wave (single element) measurement results inside power equipment is mainly based on four types of partial discharge patterns.

Figure 1 is a diagram showing reference patterns for each type of partial discharge. In Figure 1, (a) represents a free conductor discharge, (b) represents a floating electrode discharge, (c) represents an insulator defect discharge, and (d) represents a protruding electrode discharge.

On the other hand, if an abnormality is determined as a result of partial discharge measurement waveform analysis, follow-up diagnosis is performed for more accurate diagnosis, or an oscilloscope is used to measure the time difference between electromagnetic waves for each generated waveform and determine the location of partial discharge occurrence based on the distance calculation formula. After making the estimate, the power equipment is turned off and any abnormalities inside the facility are checked through disassembly and inspection of the relevant location.

Figure 2 is a diagram explaining the estimation of the location of partial discharge occurrence. Referring to FIG. 2, the location of partial discharge occurrence can be estimated as shown in Equation 1 below.

Here, 'l ₁ ' is the distance (cm) from sensor 1 to the location of partial discharge, 'l ₂ ' is the distance (cm) from sensor 2 to the location of partial discharge, and 'L' is the distance from sensor 1 to the location of partial discharge. It is the distance to 2 (cm). 'C' is the electromagnetic wave speed (speed of light), which is 3×10 ¹⁰ cm/s. 'Dt' represents the time difference (㎱) between the waveforms of sensor 1 and sensor 2. For reference, light propagates 30cm for 1㎱.

However, when determining whether a power device is defective using an indirect diagnosis method that relies on electromagnetic wave measurement data in the UHF (500~1500 MHz) band, which is the partial discharge measurement range, there is a lack of basis for determining the presence or absence of an abnormality and the inflow of external noise, etc. Diagnosis reliability and efficiency may be reduced due to inherent misjudgment factors.

For example, if excessive external noise, such as a partial discharge-like signal, is introduced, it may act as an obstacle to determining whether a partial discharge has occurred due to an internal defect in the power device.

As such, the types of external noise that can affect partial discharge judgment are listed in Table 1 below.

In this way, when the occurrence of an abnormal signal as a result of measuring partial discharge inside a power device is uncertain (intermittent signal generation, etc.), it is difficult to quickly determine whether there is an abnormality in the equipment condition and take action, and even if it is determined that the partial discharge occurred due to an internal defect, separate equipment is required. There is a limitation in that time efficiency is reduced when tracking the defect location using an oscilloscope, etc. and another diagnosis is unavoidable.

In addition, since power equipment is structurally sealed, there may be a need to check for abnormalities over a long period of time through facility power outages, device disassembly, and internal inspection due to limitations in checking for internal defects.

When an abnormality occurs as a result of partial discharge measurement in power equipment, it is inevitable that it will take time to track and conduct precise diagnosis.

For example, in the case of partial discharge, which is a representative signal caused by an insulation defect inside a power device, it has the characteristic of not occurring stably and continuously for a long time except in special cases, so it is continuously performed over a long period of time to check for abnormalities. This results in time constraints for performing the diagnosis.

Therefore, since ultra-high voltage power equipment relies only on an indirect method of measuring internal defects to diagnose abnormalities, there are various limitations, so a method that can provide reliability and speed of confirmation of abnormalities is needed.

Republic of Korea Patent Publication No. 10-1207493 (registered on November 27, 2012) Republic of Korea Patent Publication No. 10-0577347 (registered on April 28, 2006)

The purpose of the present invention is to measure and process visual and thermal images of the inside of a power device, and to detect internal abnormalities in a power device by using a complex sensor that combines sensors that measure and process arc signals and UHF signals. The aim is to provide a diagnostic device using a complex sensor for measuring internal abnormalities in power equipment to reliably and quickly determine internal abnormalities in power equipment by diagnosing and determining them.

A diagnostic device using a complex sensor for measuring internal abnormalities in power devices according to an embodiment of the present invention measures and processes visual and thermal images of the inside of the power device, and measures and processes arc signals and UHF signals. Complex sensor for configuring sensors in a complex manner; And an internal abnormality diagnosis unit for diagnosing and determining an internal abnormality of the power device using the processing result transmitted from the complex sensor and finally transmitting only an abnormal signal.

The complex sensor is a visible image measuring unit for monitoring foreign substances and abnormal phenomena occurring inside the power device using a visible image camera capable of monitoring left and right; A thermal image measuring unit to check abnormal conditions according to the temperature rise that occurs; An arc signal measuring unit for measuring the number of arc occurrences by detecting light generated during partial discharge inside the power device, accumulating it and expressing it as a quantitative value; A UHF signal measurement unit for measuring a UHF signal inside the power device using a UHF sensor; And a main body manufactured in a form that can be sealed and assembled in the inspection window of the power device, and orienting the visible image measurement unit, the thermal image measurement unit, the arc signal measurement unit, and the UHF signal measurement unit toward the inside of the power device; Including,

The visible image camera is a fisheye lens or wide-angle lens capable of monitoring 180 degrees to the left and right, and generates a real image of 180 degrees to the left and right,

The thermal imaging camera detects heat using infrared rays and generates thermal images expressed in different colors depending on temperature,

The internal abnormality diagnosis unit primarily confirms signs of internal abnormality of the power device through augmented reality using the left and right real images through arc signals and UHF band electromagnetic waves, which are indirect measurement elements, and then detects the internal abnormality of the power device. When an abnormality is detected, a complex sensor for measuring internal abnormalities in power equipment is provided to the manager by making a combined determination of the indirect measurement elements and visual confirmation, which are direct measurement elements, and provides the manager with a secondary confirmation status of the internal abnormalities of the power equipment. Diagnostic device used.

The present invention measures and image-processes visual and thermal images of the interior of power equipment, and diagnoses internal problems in power equipment using a complex sensor that combines sensors to measure and process arc signals and UHF signals. and determination, internal abnormalities in power equipment can be determined reliably and quickly.

In addition, since the present invention allows the internal state of power equipment to be checked with the naked eye, the inside of the GIS can be directly checked through AR techniques.

In addition, the present invention can reduce failure recovery costs, power outage losses, and social costs through GIS failure prevention. In other words, the present invention is expected to save approximately 1.5 billion won per bay through reduction of material costs, restoration costs, power outage costs, diagnosis and inspection costs, etc.

In addition, the present invention can improve diagnostic efficiency by installing sensors (simultaneous use of existing UHF sensors) without affecting the UHF measurement system operating inside the GIS (inspection window).

In addition, the present invention is used for internal diagnosis of GIS facilities of 154kV or higher (345kV, 765kV, etc.). It is used for on-site failure prevention diagnosis, maintenance, and repair-related inspection work, and can be used remotely by adding IEC61850 and optical communication. It can be monitored.

In addition, the present invention can also be used for internal diagnosis of M.Tr (gas type, inflow type, etc.), and can improve the reliability of substation facility diagnosis through linkage with the substation comprehensive preventive diagnosis system.

1 is a diagram showing reference patterns for each type of partial discharge;
2 is a diagram illustrating the estimation of the location of partial discharge occurrence;
Figure 3 is a diagram of a complex sensor for measuring internal abnormalities in power equipment according to an embodiment of the present invention;
Figure 4 is a diagram showing a diagnostic device using the complex sensor of Figure 3;
Figure 5 is a diagram showing a case where a diagnostic device using a complex sensor for measuring internal abnormalities in power equipment is installed in a GIS.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, detailed descriptions of known functions or configurations that may obscure the gist of the present invention are omitted in the following description and attached drawings. Additionally, it should be noted that the same components throughout the drawings are indicated by the same reference numerals whenever possible.

Terms or words used in the specification and claims described below should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately define the term to explain his or her invention in the best way. It must be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

Therefore, the embodiments described in this specification and the configuration shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent the entire technical idea of the present invention, so at the time of filing the present application, various alternatives may be used to replace them. It should be understood that equivalents and variations may exist.

In the accompanying drawings, some components are exaggerated, omitted, or schematically shown, and the size of each component does not entirely reflect the actual size. The present invention is not limited by the relative sizes or spacing depicted in the accompanying drawings.

When it is said that a part "includes" a certain element throughout the specification, this means that, unless specifically stated to the contrary, it does not exclude other elements but may further include other elements. Additionally, when a part is said to be “connected” to another part, this includes not only cases where it is “directly connected,” but also cases where it is “electrically connected” with another element in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise. Terms such as “include” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but do not include one or more other features, numbers, or steps. , it should be understood that this does not exclude in advance the possibility of the presence or addition of operations, components, parts, or combinations thereof.

Additionally, the term “unit” used in the specification refers to a hardware component such as software, FPGA, or ASIC, and the “unit” performs certain roles. However, “wealth” is not limited to software or hardware. The “copy” may be configured to reside on an addressable storage medium and may be configured to run on one or more processors. Thus, as an example, “part” refers to software components, such as object-oriented software components, class components, and task components, processes, functions, properties, procedures, Includes subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and “parts” may be combined into smaller numbers of components and “parts” or may be further separated into additional components and “parts”.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

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

FIG. 3 is a diagram of a composite sensor for measuring internal abnormalities in power equipment according to an embodiment of the present invention, and FIG. 4 is a diagram showing a diagnostic device using the composite sensor of FIG. 3.

Referring to Figures 3 and 4, the composite sensor (hereinafter referred to as 'composite sensor', 110) for measuring internal abnormalities in power equipment according to an embodiment of the present invention can be used not only through indirect measurement but also through direct measurement (visual confirmation, etc.). By combining sensors that can measure internal problems in power devices, internal problems in power devices can be diagnosed reliably and quickly.

This complex sensor 110 is equipped with a visible image measurement unit 111 and a thermal image measurement unit 112 for direct measurement, and an arc signal measurement unit 113 and a UHF signal measurement unit 114 for indirect measurement. Equipped with

Specifically, the visible image measurement unit 111 uses a fish-eye lens or a fish-eye lens capable of 180° monitoring to the left and right in order to directly monitor foreign substances and abnormal phenomena occurring inside the sealed power equipment with the naked eye. Using two high-resolution visible cameras with wide-angle lenses, the internal condition of power equipment can be monitored from the outside.

Here, the real image camera is capable of monitoring 180 degrees to the left and right, so it generates real images of 180 degrees to the left and right, and the left and right real images show the internal state of the power equipment for Augmented Reality (AR) from the outside. It can be confirmed. In other words, the power equipment manager can visually check the internal status of the power equipment using VR-Glass from the outside.

Next, the thermal image measurement unit 112 allows the status of the power device to be monitored from the outside using a high-resolution thermal imaging camera in order to check for abnormalities in temperature rise due to concentration of current generated inside the power device. .

Here, the thermal imaging camera detects heat using infrared rays and displays it in different colors depending on the temperature, allowing the internal temperature of the power device to be confirmed from the outside.

Next, the arc signal measurement unit 113 uses a highly sensitive arc detection element to check partial discharge signals (e.g., arc light in the 830 nm band) that occur intermittently due to internal abnormalities in power equipment. The number of arc occurrences is measured by detecting the light generated during partial discharge and accumulating and expressing it as a quantitative value.

The UHF signal measurement unit 114 detects existing electromagnetic waves using a UHF sensor.

In this way, the composite sensor 110 can improve the reliability and efficiency of diagnosing internal problems in power equipment by increasing the technical compatibility of existing sensors and adding the functions of composite elements.

This complex sensor 110 includes a visible image measurement unit 111, a thermal image measurement unit 112, and an arc signal measurement unit 113 in a main body 115 that is manufactured in a form that can be sealed and assembled in the inspection window of an existing power device. ) and a UHF signal measurement unit 114 is formed (see Figure 5). Figure 5 is a diagram showing a case where a diagnostic device using a complex sensor for measuring internal abnormalities in power equipment is installed in a GIS.

Here, the visible image measurement unit 111, the thermal image measurement unit 112, the arc signal measurement unit 113, and the UHF signal measurement unit 114 are installed inside the power device when the main body 115 is assembled into the power device. heading towards

Referring to FIG. 4, the diagnostic device using the composite sensor 110 includes a composite sensor 110, a visible image processor 121, a thermal image processor 122, an arc signal processor 123, and a UHF signal processor ( 124), and includes an internal abnormality diagnosis unit 130.

The complex sensor 110 is a component for image processing or signal processing and includes a visible image processing unit 121, a thermal image processing unit 122, an arc signal processing unit 123, and a UHF signal processing unit 124. However, here, for convenience of explanation, it will be described as a separate component.

The real image processing unit 121 processes the left and right real images obtained through the real image measuring unit 111 and provides them as three-dimensional real images.

The thermal image processing unit 122 provides the thermal image acquired through the thermal image measurement unit 112 as a two-dimensional thermal image through infrared image processing.

The arc signal processing unit 123 detects a valid signal for the arc signal measured through the arc signal measuring unit 113 and accumulates it in a metered form to generate a digital hold signal.

The UHF signal processing unit 124 processes the capacitance of the UHF signal measured through the UHF signal measurement unit 114 to generate an N-type analog signal.

The internal abnormality diagnosis unit 130 uses the results transmitted through the visible image processing unit 121, the thermal image processing unit 122, the arc signal processing unit 123, and the UHF signal processing unit 124 to determine the internal abnormality of the power equipment. is diagnosed and judged first. That is, the internal abnormality diagnosis unit 130 first diagnoses and determines the internal abnormality of the power device, and then finally transmits only the abnormal signal to the upper level. This is to reduce errors in determining internal problems in power devices due to external noise and improve the diagnostic ability for internal problems in power devices to minimize the impact of traffic on the communication network.

In this case, the internal abnormality diagnosis unit 130 is equipped with an artificial intelligence algorithm and can primarily determine the internal abnormality of the power device based on the self-learning function.

The internal error diagnosis unit 130 is capable of communicating with the outside wired or wirelessly using an IEC61850-based communication method. That is, the internal error diagnosis unit 130 can provide a status that can be remotely monitored through IEC61850 and optical communication.

In addition, the internal abnormality diagnosis unit 130 can use the left and right real images transmitted through the real image image processing unit 121 to check the internal state of the power device from the outside through augmented reality.

That is, the internal abnormality diagnosis unit 130 displays thermal images and visible images on the screen so that the manager can directly check foreign substances with the naked eye, and in the case of arc signals, accumulated data read from the complex sensor 110 It provides trends in the number and frequency of occurrences of abnormal signals, making it possible to diagnose internal abnormalities.

In this way, the internal abnormality diagnosis unit 130 is not only a structure that cannot be opened in the operating state because the power equipment is sealed, but also because the manager cannot monitor the internal abnormality 24 hours a day, the complex sensor 110 is used. Therefore, it is necessary to diagnose internal abnormalities in a complex manner.

That is, the internal abnormality diagnosis unit 130 first checks the internal abnormality signs of the power device through indirect measurement elements (arc signals, UHF band electromagnetic waves), and then, when the internal abnormality signs of the power device are detected, the indirect measurement element In addition, by complexly judging direct measurement elements, it provides managers with a secondary confirmation of internal abnormalities in power equipment.

Although the above description focuses on the novel features of the invention as applied to various embodiments, those skilled in the art will appreciate the apparatus and methods described above without departing from the scope of the invention. It will be understood that various deletions, substitutions, and changes may be made in the form and details of . Accordingly, the scope of the invention is defined by the appended claims rather than by the foregoing description. All modifications within the scope of equivalency of the claims are included in the scope of the present invention.

110: Complex sensor 111: Real image measuring unit
112: thermal image measurement unit 113: arc signal measurement unit
114: UHF signal measurement unit 121: Real image processing unit
122: thermal image processing unit 123: arc signal processing unit
124: UHF signal processing unit 130: Internal error diagnosis unit

Claims (1)

A complex sensor for measuring and processing visual and thermal images of the interior of power equipment, and measuring and processing arc signals and UHF signals; and
An internal fault diagnosis unit for diagnosing and determining an internal fault in the power device using the processing results transmitted from the complex sensor and finally transmitting only the fault signal;
The complex sensor is,
A visible image measuring unit for monitoring foreign substances and abnormal phenomena occurring inside the power device using a visible image camera capable of monitoring left and right;
A thermal image measuring unit for checking abnormal conditions according to a temperature increase occurring inside the power device using a thermal imaging camera;
An arc signal measuring unit for measuring the number of arc occurrences by detecting light generated during partial discharge inside the power device, accumulating it and expressing it as a quantitative value;
A UHF signal measurement unit for measuring a UHF signal inside the power device using a UHF sensor; and
A main body manufactured in a form that can be sealed and assembled into the inspection window of the power device, and orienting the visible image measurement unit, the thermal image measurement unit, the arc signal measurement unit, and the UHF signal measurement unit toward the inside of the power device;
Including,
The visible camera is,
It is a fisheye lens or wide-angle lens capable of monitoring 180 degrees to the left and right, and creates a real image of 180 degrees to the left and right.
The thermal imaging camera,
It detects heat using infrared rays and creates thermal images that are expressed in different colors depending on temperature.
The internal abnormality diagnosis unit,
Using the left and right real images, signs of internal abnormality of the power device are first confirmed through augmented reality through arc signals and UHF band electromagnetic waves, which are indirect measurement elements, and then, when signs of internal abnormality of the power device are detected, A diagnostic device using a complex sensor for measuring internal abnormalities in power equipment that provides the manager with a state in which internal abnormalities in the power equipment can be secondarily confirmed by complexly determining the indirect measurement elements and the visual confirmation, which are direct measurement elements.