KR101200052B1 - Thereof method and progressive unusual condition real time diagnostic equipment of transformers - Google Patents

Abstract

PURPOSE: A progressive abnormal state real time diagnosing apparatus and method of a transformer are provided to analyze supersonic wave characteristics generated in the degradation and partial discharge in real time and to systematically manage the corresponding transformer based on the analyzed result. CONSTITUTION: A sensor module(1) is attached to a transformer external box and senses a supersonic wave signal generated in the internal deterioration and partial discharge of the transformer. A device module(2) analyzes the supersonic wave signal which is collected from the sensor module. The device module classifies state change of the transformer according to step and automatically reports abnormal state generation result to an upper layered system. [Reference numerals] (11) Ultrasonic wave sensor; (12) Temperature sensor; (21) Signal conversion module; (22) Control processing module; (24) Data storing module; (AA) Communication module; (BB) Host system

Description

Progressive fault condition real-time diagnostic device of transformer and its method {THEREOF METHOD AND PROGRESSIVE UNUSUAL CONDITION REAL TIME DIAGNOSTIC EQUIPMENT OF TRANSFORMERS}

The present invention relates to a real-time diagnostic device and method of the progressive abnormal state of the transformer, and more particularly, to analyze the ultrasonic characteristics generated during the degradation and partial discharge of the transformer in real time and to systematically analyze the transformer based on the analysis results The present invention relates to a real-time diagnostic device for a progressive abnormal state of a transformer and a method thereof.

Korea's industry was driven by the economic development plan in the late 1960s, and the power industry was shifting from high growth to stable growth. It is also changing from rapid increase to stable growth, and it is important at this time to ensure smooth operation and reliability of electric power facilities.

On the other hand, in the distribution system mainly responsible for the load part of the power system, the stable supply of power is smoothly performed by the Supervisory Control and Data Acquisition (SCADA) installed between major substations, The power is supplied through the column transformer.

The capacity of the pole transformer is divided into a plurality of blocks at a terminal substation and calculated based on the estimated load.

However, in recent years, due to the increase in loads by air conditioning and heating loads and information processing facilities such as computers, the increase in the load concentration area and the biased load due to the temporary use of over-contracted capacity in commercial areas. This is getting worse.

That is, the load of the columnar transformer, which is mainly installed on a pole, changes irregularly and sometimes is heated by an overload to promote deterioration and partial discharge. If repeated frequently, the service life is shortened due to damage of insulation between winding wires and increase of leakage current.

Therefore, a high-reliability operation of the distribution system requires a monitoring system that diagnoses the deterioration state of the electrical equipment. Currently, the diagnosis of the transformer deterioration state is mainly performed by ultrasonic diagnosis, oil-in-oil gas method or partial discharge method. As a method, a system for analyzing a large capacity high power transformer has been developed.

In addition, a monitoring system has been developed that can remotely measure digitized data using dielectric tangents of columnar transformer insulation oil and easily diagnose the deterioration of columnar transformers on the ground using wireless data communication. The problem is not easy to grasp.

An object of the present invention is to solve the above problems, and includes a sensor module for detecting the state of the transformer and a device module for determining the abnormal state by calculating the total amount of ultrasonic energy detected by the sensor module, The present invention provides an apparatus and method for real-time diagnosis of a progressive abnormal state of a transformer to enable stepwise and systematic management and supervision in response to a change in the state of a transformer.

Another object of the present invention is to provide a communication module which wirelessly transmits the analysis result of the transformer by the device module to a higher system, so that the abnormal state of the transformer can be checked at a remote place from time to time and preventive diagnosis of the accident is possible. The present invention provides an apparatus and method for diagnosing a progressive abnormal condition.

In order to achieve the above object, the present invention, a sensor module for detecting the ultrasonic signal generated during internal deterioration and partial discharge of the transformer in a state attached to the transformer enclosure; And an apparatus module configured to analyze the ultrasonic signals collected from the sensor module in real time to classify the state change of the transformer in stages, and automatically report an abnormal state occurrence result to a higher system.

In addition, the sensor module, while detecting the internally generated ultrasonic waves of the transformer in real time, the ultrasonic sensor to detect only the ultrasonic waves of a specific band belonging to the progressive abnormal state category, and a temperature sensor for correction of the measurement error according to the temperature change Characterized in that configured.

In addition, the device module, the signal conversion module for converting the analog signal sensed by the sensor module into a quantized digital signal, and processing the digital signal collected through the signal conversion module based on a preset command or an external command The control processing module, the communication module for allowing the control processing module to exchange data with the upper system, and the historical data on the progress abnormality granted by the control processing module are recorded and managed by time and date. Characterized in that it comprises a data storage module.

In addition, the control processing module, a data processing unit for processing, processing and storing digital signal data, a signal analysis unit for calculating the total amount of ultrasonic energy of a specific band through the analysis of the ultrasonic signal and temperature signal, and storing the historical data for each period And a data management unit for managing, a state judging unit for determining and classifying an abnormal state of the transformer, and a communication processing unit for interconnection with an upper system.

In addition, the control processing module converts the digital signal quantized by the signal conversion module into a frequency band, divides a 5 KHz to 60 KHz band section by a digital band pass, and integrates and corrects errors of all digital signal sizes in the corresponding section. It is characterized by obtaining the total amount of ultrasonic energy through.

The control processing module may further include an error correction unit for correcting an error in converting an ultrasonic signal by the data processing unit into a quantized digital signal after the correction.

In addition, the control processing module analyzes the magnitude of the digital signal in a specific section using the digital band pass, but analyzes the magnitude of the digital signal in the 5 KHz ~ 20 KHz band, which is an excessive frequency band of the transformer. It is done.

In addition, the real-time diagnostic method of the progressive abnormal state of the transformer according to the present invention, the time-band analysis step of analyzing the analog signal detected by the sensor module for the ultrasonic wave detection of the transformer at a sampling rate of 200,000 times per second; A frequency band analysis step of analyzing which band of the ultrasonic waves is the quantized digital signal through the time band analysis step; An energy total calculation step of converting data of a time band into data of a frequency band based on the analysis result of the frequency band analyzing step, and integrating and calculating the total amount of ultrasonic energy in a specific band; A correction total amount calculation step of finally correcting an error occurring during the conversion of the analog signal in the energy amount calculation step to a quantized digital signal after correction by applying a conversion factor according to temperature characteristics; And a data management step of classifying the total amount of ultrasonic energy calculated through the correction total amount calculation step and classifying and storing the ultrasonic energy by time and date.

As can be clearly seen from the above description, the real-time diagnostic apparatus and method of the progressive abnormal state of the transformer of the present invention, through the real-time detection of the transformer state change and the analysis of the detection result by the classification of the grade data, the progressive abnormality of the transformer Considering the status, it has the effect of constructing a more proactive and active management system system.

In addition, it is possible to prevent the occurrence of fire or power failure due to deterioration and partial discharge in advance by understanding the trend of transformer state change according to the above-described management system system. It has the effect of restraining enormous loss of property due to burnout of facilities and promoting social stability.

In addition, it is possible to grasp the abnormal state of the transformer even at a remote location, and it is possible to greatly improve the convenience of the post-management and the improvement of the working environment such as the supervision of the transformer without the need to visually check the transformer by the on-site operation. It is a very useful invention.

1 is a block diagram showing the configuration of a real-time diagnostic device for advanced abnormal state of the transformer according to the present invention.
Figure 2 is a block diagram showing the functional configuration of the software for the system implementation of the real-time diagnostic failure state condition of the transformer according to the present invention.
Figure 3 is a block diagram showing the calculation of the total amount of ultrasonic energy by the real-time diagnostic method of the progressive abnormal state of the transformer according to the present invention.
4A and 4B are graphs showing digital band pass filter frequency bands and abnormal state occurrence frequency bands in a distribution pattern of a digital signal analyzed by a progressive abnormal state real-time diagnostic apparatus of a transformer according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

Figure 1 is a block diagram showing the configuration of the real-time diagnostic device for the progressive abnormal state of the transformer according to the present invention, Figure 2 is a function of the software for the system implementation of the real-time diagnostics for the progressive abnormal state of the transformer according to the present invention Figure 3 is a block diagram showing the configuration, Figure 3 is a block diagram showing the calculation step of the total amount of ultrasonic energy in the real-time diagnostic device and method of the progressive abnormal state according to the present invention, Figures 4a and 4b is a transformer according to the present invention In the distribution pattern of the digital signal analyzed by the progressive abnormal state real-time diagnostics of the digital band pass filter frequency band and the abnormal state occurrence frequency band, respectively.

As shown in FIG. 1, the apparatus for real-time progression of abnormal state of a transformer according to the present invention includes a sensor module 1 for detecting an ultrasonic signal generated during internal degradation and partial discharge in a state in which a transformer t is attached to an enclosure. And, by analyzing the ultrasonic signal collected from the sensor module (1) in real time to distinguish the state change of the transformer (t) step by step while the device module (2) to automatically report the result of the occurrence of abnormal state to the upper system It is configured to include.

For reference, the device module (2), when applied to the columnar transformer, it is preferable to be installed in or around the housing of the controller when applied to a large transformer of large poles.

Accordingly, the signal cable for the interconnection when the sensor module 1 and the device module 2 are spaced about 1 m to 3 m apart from each other, the noise protection is implemented through protection from external noise (Noise) It is preferable that it is a shield cable.

In addition, a pre-amplifier may be further included to compensate for the attenuation of the ultrasonic signal due to the mutual separation between the sensor module 1 and the device module 2. Here, the operating power of the preamplifier is to be supplied from the device module (2).

The sensor module 1 is for detecting an ultrasonic signal generated therein when the state of the transformer t changes, and detecting the ultrasonic wave generated internally in the transformer t in real time, but belonging to a progressive abnormal state category. Ultrasonic sensor 11 that detects only the ultrasonic wave of the band, and the temperature sensor 12 for the correction of the measurement error according to the temperature change.

On the other hand, the above-described sensor module (1), when applied to the transformer already installed, the external type that can be used to attach to the enclosure, and when applied to a newly produced transformer is manufactured to be divided into the internal type that can be installed and used therein desirable. In addition, in the case of the built-in type, it is necessary to have a design structure considering waterproofness in consideration of the characteristic of always making the submerged state in the insulating oil in the transformer (t).

The device module 2 collects and analyzes the ultrasonic signals of the transformer t collected through the sensor module 1 and stores them as historical data while automatically reporting to an upper system when an abnormal state is detected. The signal conversion module 21 converts the ultrasonic analog signal detected by the sensor module 1 into a quantized digital signal, and the signals collected through the signal conversion module 21 according to a preset command or an external command. The control processing module 22 to be processed, the communication processing module 23 for allowing the control processing module 22 to exchange data with a higher system such as a central server, and the control processing module 22 It is configured to include a data storage module 24 for recording and managing the historical data for the progressive abnormal state by time zone and date.

As described above, the signal conversion module 21 is preferably an A / D (Analog-to-Digital) conversion device that is commonly used to convert analog signals into digital signals.

The control processing module 22 converts the digital signal quantized by the signal conversion module 21 into a frequency band as shown in FIG. 4A and performs a digital band-pass filter. After dividing the 5KHz ~ 60KHz band section, and calculating the total amount of ultrasonic energy through the integration process and error correction of all digital signal size in the section, save the historical data based on preset command or external command Send it to the system.

Here, the digital signal in the specific band is analyzed using the digital band pass, but as illustrated in FIG. 4B, the digital signal in the 5 KHz to 20 KHz band, in which an abnormal state of the transformer t is excessive, is concentrated. It is preferable to analyze.

To this end, as shown in Figure 2, the data processing unit 221 for processing, processing and storing the data converted from the analog signal collected from the sensor module 1 into a digital signal, and the ultrasonic signal and temperature signal analysis Signal analysis unit 222 for calculating the total amount of ultrasonic energy in a specific band through the data, the data management unit 223 for storing and managing the history data for each period, and the status determination unit for determining and classifying the abnormal state of the transformer (t) ( 224 and a communication processing unit 225 for interconnection with a higher system.

In addition, in order to minimize the error generated when the ultrasonic signal is converted by the data processor 221, the last two bits are removed and the conversion factor according to the temperature characteristic is applied to correct the error. It further includes an error correction unit 226 for final completion with a signal.

The communication module 23 is a short duplex serial communication based RS-485, a wireless LAN (WIFI) based on short-range wireless communication using a high-speed Internet within a certain distance of a place where a wireless access device (AP) is installed. It is desirable to provide an interface output such as PLC (Power Line Communication), which is a communication service based on voice, data, and the Internet through a cable.

Ultrasonic signal diagnostic method using a progressive abnormal state real-time diagnostic device of the transformer of the present invention having such a structure, as shown in Figure 3, the sampling rate of 200,000 times per second the analog signal detected by the sensor module 1 Time band analysis step (S100) for analyzing with; A frequency band analysis step (S200) of analyzing which band of ultrasonic waves is the quantized digital signal through the time band analysis step (S100); Total amount of energy that integrates and calculates the total amount of ultrasonic energy in the 5KHz ~ 20KHz band using a digital bandpass filter while converting the data of the time band to the data of the frequency band based on the analysis result through the frequency band analysis step (S200). Calculating step (S300); And,

A correction total amount calculation step (S400) of finally completing the quantized digital signal after correcting an error occurring during the conversion of the analog signal (ultrasonic signal) in the energy amount calculation step (S300) by applying a conversion factor according to temperature characteristics; And a data management step (S500) of classifying the total amount of ultrasonic energy calculated through the correction total amount calculation step (S400) and classifying and storing the total amount of ultrasonic energy based on time and date.

Referring to the operation of the progressive abnormal state real-time diagnostic apparatus of the transformer according to the present invention having the above configuration as follows.

First, the sensor module 1 detects an ultrasonic signal in real time in a state of being attached to an enclosure of a transformer t or embedded in a newly manufactured transformer.

Subsequently, the ultrasonic signal detected by the sensor module 1 is converted by the signal conversion module 21 of the device module 2 into a quantized digital signal at the same time as the acquisition and then the control processing module ( 22).

Subsequently, the digital signal transmitted from the sensor conversion module 21 is converted into a frequency band by the control processing module 22, and is 5KHz to 60KHz band by a digital band-pass filter. The total amount of the ultrasonic energy through the integral processing and error correction of all digital signal magnitudes in the corresponding section is obtained and stored as historical data based on a preset command or an external command. 23) can be automatically sent to the upper system.

As a result, by using the progressive abnormal state real-time diagnostic device of the transformer according to the present invention, it is possible to easily and quickly determine the change in the state of the transformer (t), while the continuous management and supervision through the historical data collection and the communication module (23) By interconnecting with the upper system by, it is possible to more conveniently detect the state change of the transformer (t) in real time even at a remote location.

In addition, the detection and analysis of the specific ultrasonic signal in the 5KHz ~ 60KHz band of excessive progress of the abnormal state of the transformer (t) as well as the analysis result is automatically reported to the upper system by the communication module 23, thereby providing a transformer ( It is possible to further improve the efficiency of the diagnostic method of t).

As described above, the present invention has been described in detail by using a preferred embodiment, but the scope of the present invention is not limited to the specific embodiment, it should be interpreted by the appended claims. In addition, those of ordinary skill in the art that various modifications can be made without departing from the scope and spirit of the present invention.

1: sensor module, 2: device module
11: ultrasonic sensor, 12: temperature sensor
21: signal conversion module, 22: control processing module
23: communication module, 24: data storage module
221: data processing unit, 222: signal analysis unit
223: data management department, 224: status judgment
225: communication processing unit, 226: error correction
S100: time band analysis step, S200: frequency band analysis step
S300: calculating energy amount, S400: calculating correction amount
S500: data management stage

Claims (8)

A sensor module attached to a transformer enclosure for sensing an ultrasonic signal generated during internal deterioration and partial discharge of the transformer; And an apparatus module configured to analyze the ultrasonic signals collected from the sensor module in real time to classify the state change of the transformer in stages, and to automatically report an abnormal state occurrence result to a higher system.
The device module includes a signal conversion module for converting an analog signal sensed by the sensor module into a quantized digital signal, and processing the digital signal collected through the signal conversion module based on a preset command or an external command. A control processing module, a communication module for allowing the control processing module to exchange data with an upper system, and data storage for recording and managing historical data on progress abnormality granted by the control processing module for each time zone and date. Including modules,
The control processing module converts the digital signal quantized by the signal conversion module into a frequency band, divides a 5KHz to 60KHz band section by a digital band pass, and integrates and corrects errors of all digital signal sizes in the corresponding section. Progressive fault condition real-time diagnostic device of the transformer, characterized in that the total amount of the ultrasonic energy.
The method of claim 1,
The sensor module detects the internally generated ultrasonic waves of the transformer in real time, and detects only ultrasonic waves in a specific band belonging to a progressive abnormal state category;
Progressive abnormal state real-time diagnostic device of the transformer, characterized in that composed of a temperature sensor for correction of the measurement error according to the temperature change.
delete The method of claim 1,
The control processing module includes a data processing unit for processing, processing and storing digital signal data;
A signal analyzer for calculating the total amount of ultrasonic energy in a specific band by analyzing ultrasonic signals and temperature signals;
A data management unit for storing and managing history data for each period;
A state judging unit for determining and classifying an abnormal state of the transformer;
Progressive fault condition real-time diagnostic device of a transformer, characterized in that it is classified as a communication processing unit for interconnection with the upper system.
delete The method of claim 4, wherein
The control processing module further comprises an error correction unit for correcting an error in the conversion of the ultrasonic signal by the data processing unit and finally completing the quantized digital signal.
The method of claim 1,
The control processing module analyzes the magnitude of the digital signal in a specific section using the digital band pass,
Progressive abnormal state real-time diagnostic device of the transformer, characterized in that for analyzing the magnitude of the digital signal in the frequency band 5KHz ~ 20KHz band of the abnormal state of the transformer.
A time band analysis step of analyzing the analog signal detected by the sensor module for detecting the internally generated ultrasonic wave of the transformer at a sampling rate of 200,000 times per second;
A frequency band analysis step of analyzing which band of the ultrasonic waves is the quantized digital signal through the time band analysis step;
An energy total calculation step of converting data of a time band into data of a frequency band based on the analysis result of the frequency band analyzing step, and integrating and calculating the total amount of ultrasonic energy in a specific band;
A correction total amount calculation step of finally correcting an error occurring during the conversion of the analog signal in the energy amount calculation step to a quantized digital signal after correction by applying a conversion factor according to temperature characteristics; And,
And a data management step of classifying the total amount of ultrasonic energy calculated through the correction total amount calculation step and classifying and managing the total amount of ultrasonic energy based on time period and date.

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