KR101760143B1 - Apparatus and method for diagnosing partial discharge of high voltage facilities using a plurality of sensors - Google Patents

Abstract

The present invention relates to an apparatus and method for detecting a partial discharge of a high-voltage power device, and more particularly, to a method and apparatus for detecting a partial discharge of a high-voltage power device by using at least one sensor, And more particularly, to a device and method for partial discharge diagnosis of a device. To this end, an apparatus for diagnosing a partial discharge of a high-voltage power device according to the present invention includes: a plurality of sensors having different frequency ranges of signals to be measured; A plurality of sensor-specific modules for sampling signals detected by the plurality of sensors and converting the signals into digital signals; And a signal processing unit for analyzing the type of the partial discharge by processing the digital signals converted from the plurality of sensor-specific modules, wherein each sensor-specific module of the plurality of sensor-specific modules includes a plurality of And a filter capable of extracting a signal having a frequency band corresponding to a frequency range of a measurement object signal of a specific sensor from the signals detected by the sensors of the plurality of sensors, And the partial discharge of the high-voltage power device is measured by inserting a sensor-specific module corresponding to the selected one or more sensors into the main body.

Description

[0001] APPARATUS AND METHOD FOR DIAGNOSING PARTIAL DISCHARGE OF HIGH VOLTAGE FACILITIES [0002] USING A PLURALITY OF SENSORS [0003]

The present invention relates to an apparatus and method for detecting a partial discharge of a high-voltage power device, and more particularly, to a method and apparatus for detecting a partial discharge of a high-voltage power device by using at least one sensor, And more particularly, to a device and method for partial discharge diagnosis of a device.

BACKGROUND OF THE INVENTION High-voltage power devices such as gas insulated switchgear (GIS), power inflow transformers, gas insulated transformers, reactors, etc., are filled with insulating gas or insulating oil in the enclosure of the grounded structure, As shown in Fig. The high-voltage power device is a device for detecting a partial discharge partial discharge (PD) in the gas-insulated equipment due to a foreign substance present inside the device, internal defects such as scratches and protrusions on the inner surface of the enclosure, Partial discharge may occur. Such partial discharge greatly affects the performance of the gas-insulated apparatus. If left untouched, there is a possibility that a serious accident may be connected. Accordingly, a partial discharge measuring device for detecting a partial discharge of a high-voltage power device or the like at an early stage has been developed. Currently, a 25.8 kV gas-insulated switchgear is provided with a transient earth voltage (TEV) Or a partial discharge measurement device using a UHF (Ultra High Frequency) sensor for a 170 kV gas insulated switchgear, a partial discharge due to an incomplete connection of a conductor in a gas insulated switchgear and internal failure due to self-defects Is performed.

1, a capacitive sensor 12 for sensing the degree of deterioration of insulation is attached to an enclosure 1 of a gas insulated switchgear so as to detect the degree of deterioration of the inside of the gas insulated switchgear The transient ground voltage of the frequency induced on the surface of the enclosure 1 is detected in accordance with the surface effect of the high frequency induced by the partial discharge and the transient ground voltage detected by the capacitive sensor 12 is applied to the measuring device 10 And the degree of insulation deterioration inside the gas insulated switchgear is measured.

2, the measurement of the partial discharge using the UHF sensor is performed by a UHF sensor 22 attached to the gas insulated switchgear 2 to measure the partial discharge of the UHF band And detects a radio wave signal and transmits it to the measuring device 20. The pattern of the measurement signal sensed by the UHF sensor 22 is analyzed to derive a partial discharge type and the approximate partial discharge generation position ≪ / RTI >

However, in the partial discharge measurement using the TEV sensor which is currently being developed and applied, the reliability of the partial discharge diagnosis is insufficient due to excessive noise, and the partial discharge measurement using the UHF sensor can remove the disturbance by measuring the external electromagnetic noise signal It is possible to diagnose the partial discharge only when the measuring sensor is attached to the gas insulated switchgear, and the measuring device is expensive and is not easy to carry.

It is an object of the present invention to provide a partial discharge diagnostic technique of a high voltage power device capable of employing one or more sensors having different frequency ranges of a signal to be measured by using a conventional TEV sensor or a UHF sensor, And to improve the reliability of measurement technology.

According to an aspect of the present invention, there is provided an apparatus for diagnosing a partial discharge of a high-voltage power device, the apparatus comprising: A plurality of sensors that are different from each other; A plurality of sensor-specific modules for sampling signals detected by the plurality of sensors and converting the signals into digital signals; And a signal processing unit for analyzing the type of the partial discharge by processing the digital signals converted from the plurality of sensor-specific modules, wherein each sensor-specific module of the plurality of sensor- And a filter capable of extracting a signal having a frequency band corresponding to a frequency range of a measurement target signal of a specific sensor from the signals detected by the plurality of sensors which are different from each other, Voltage power device, and a sensor for each sensor corresponding to the selected one or more sensors is inserted into the portable main body to measure a partial discharge of the high-voltage power device. One sensor-specific module measures a type corresponding to the sensor- , And the plurality of sensors collect the signals from the sensors of the Ultra-sonic sensor, HFCT further comprising a synchronous signal unit for acquiring an externally input synchronous signal, the synchronous signal unit including at least one of an ultrasonic sensor, a TEV (Transient Earth Voltage) sensor and a UHF (Ultra High Frequency) sensor, The data for diagnosing the type of the partial discharge signal in accordance with the synchronous signal acquired by the signal unit is compared with the signal data corresponding to the stored partial discharge type to derive the analysis result, The generated partial discharge type is displayed on the screen, and the screen is composed of a phase axis, a magnitude axis and a time axis, and can display the waveform form of the signal.

Each of the plurality of sensor-specific modules of the plurality of sensor-specific modules may include a peak-hold unit for storing a previous sample signal until the next sample signal is sampled from the signal detected by the sensor.

At this time, each sensor-specific module of the plurality of sensor-specific modules is stored in the peak-hold unit so that the next sample signal can be stored in the peak-hold unit when the previous sample signal is converted into a digital signal And a reset unit for resetting the previous sample signal.

In this case, the sensor-specific module of each of the plurality of sensor-specific modules samples the signal extracted by the filter for a preset period, converts the sampled signal into a digital signal, collects the converted digital signal for the predetermined period, Lt; / RTI >

At this time, the signal processing unit compares the digital signal converted from the plurality of sensor-specific modules with signals corresponding to the stored partial discharge types, and diagnoses the partial discharge type of the signal detected by the plurality of sensors can do.

delete

delete

delete

delete

At this time, the plurality of sensors may be connected to the plurality of sensor-specific modules by a single cable.

According to another aspect of the present invention, there is provided a method for diagnosing a partial discharge of a high voltage power device, the method comprising: Selecting one or more of a plurality of sensors having different ranges from each other to detect a partial discharge signal from the high voltage power device; And at least one of the plurality of sensors, which is inserted into the portable main body and is capable of extracting a signal having a frequency band corresponding to a frequency range of a frequency of a measurement target signal of the specific sensor from the partial discharge signals detected by the selected one or more sensors Extracting a signal having a frequency band corresponding to a frequency range of a measurement target signal for each sensor using a sensor-specific module; Sampling the partial discharge signal extracted by the sensor-specific module and converting the sampled partial discharge signal into a digital signal; And analyzing the type of the partial discharge signal with respect to the partial discharge signal detected by the selected one or more sensors by processing the converted digital signal, wherein one sensor-specific module corresponds to the sensor-specific module And the plurality of sensors include at least one of an Ultra-sonic sensor, an HFCT sensor, a TEV sensor, and a UHF sensor, and the analyzing step includes: The partial discharge type generated through the derivation of the analysis result is displayed on the screen, and the partial discharge type generated through the derivation of the analysis result is displayed on the screen. The screen is composed of a phase axis, a magnitude axis and a time axis, and can display the waveform form of the signal.

The step of sampling the partial discharge signal extracted by the sensor-specific module and converting the partial discharge signal into a digital signal may include storing the previous sample signal until the next sample signal is sampled from the partial discharge signal detected by the sensor can do.

In this case, the step of sampling the partial discharge signal extracted by the sensor-specific module and converting the sampled partial discharge signal into a digital signal may further include a step of, when the previous sample signal is converted into a digital signal, And resetting the sample signal.

The step of sampling the partial discharge signal extracted by the per-sensor module and converting the sampled partial discharge signal into a digital signal may include sampling the partial discharge signal extracted by the module for each sensor for a predetermined period, converting the sampled partial discharge signal into a digital signal, And collecting the signal for the predetermined period.

The analyzing of the type of the partial discharge signal with respect to the partial discharge signal detected by the selected one or more sensors may include analyzing the digital signal converted from the partial discharge signal extracted by the sensor- And diagnosing a partial discharge type of the signal detected by the plurality of sensors in comparison with signals corresponding to the type of the partial discharge.

delete

delete

delete

delete

At this time, the selected one or more sensors may be connected to the corresponding one or more sensor-specific modules by a single cable.

According to the present invention, by diagnosing the partial discharge of the high-voltage power device by using one or more sensors whose frequency ranges of the measurement object signals are different from each other, the reliability of the measurement result on whether or not the partial discharge is generated can be further guaranteed.

In addition, it is possible to more reliably prevent malfunctions in ultra-high voltage electric power facilities, thereby ensuring stable supply of electric power to customers and reducing the cost of recovering from electric power accidents.

Since it is possible to measure the partial discharge signal by various sensors with one diagnostic equipment, convenience of partial discharge diagnosis and portability of equipment can be achieved at the same time.

1 is a diagram for explaining a concept of measuring a partial discharge of a high voltage power device using a conventional TEV sensor.
FIG. 2 is a diagram for explaining a concept of measuring a partial discharge of a high-voltage power device using a conventional UHF sensor.
3 is a diagram schematically illustrating a concept of diagnosing a partial discharge of a high-voltage power device using the partial discharge diagnosis apparatus according to the present invention.
4 is a block diagram illustrating a configuration of a partial discharge diagnosis apparatus according to an embodiment of the present invention.
5 is a block diagram for explaining a configuration of a sensor-specific module in the partial discharge diagnosis apparatus according to an embodiment of the present invention.
6 is a view for explaining a concept that a sensor-specific module is inserted into a main body in a partial discharge diagnosis apparatus according to an embodiment of the present invention.
7 is a flowchart showing a partial discharge diagnosis method according to the present invention.
8 is a diagram showing an initial screen of a display unit of the partial discharge diagnosis apparatus according to the present invention.
9 is a diagram showing a screen of a display unit of the partial discharge diagnosis apparatus according to the present invention when a floating electrode defect occurs.
10 is a diagram showing a screen of the display unit of the partial discharge diagnosis apparatus according to the present invention when a protruding electrode defect is generated.
11 is a diagram showing a screen of a display unit of the partial discharge diagnosis apparatus according to the present invention when voids are generated in a space.
12 is a flowchart specifically showing the step S700 in the partial discharge diagnosis method according to the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, the configuration and operation of the partial discharge diagnosis apparatus according to the embodiment of the present invention will be described.

3 is a diagram schematically illustrating a concept of diagnosing a partial discharge of a high-voltage power device using the partial discharge diagnosis apparatus according to the present invention.

3, the gas-insulated switchgear 3 having the high-voltage conductor 3a and the spacer 3b therein is constructed so that the high-voltage conductor 3a is inadvertently placed in the process of manufacturing or assembling the gas- A protruding electrode defect which appears when a sharp protruding portion 4a is formed on the surface, freedom from the metal 4b created during the manufacturing process of the gas-insulated switchgear 3, Conductor defects and floating electrode defects generated when the conductors are insufficiently insulated around the conductors 4c separated in a state that the conductors are not electrically connected to any of the center electrode and the enclosure electrode in the gas insulated switchgear 3, Voids 4d are generated in the spacer 3b due to thermal, electrical and environmental complex deterioration of the gas insulated switchgear 3 in the spacer 3b or the spacer defects The partial discharge is generated.

In order to diagnose various types of partial discharges to the gas insulated switchgear 3, the partial discharge diagnosis apparatus according to the present invention includes an Ultra-sonic sensor 30a, a HFCT (High Frequency Current Transformer) sensor 30b, A Transient Earth Voltage (TEV) sensor 30c and a UHF (Ultra High Frequency) sensor 30d, or a plurality of sensors are attached to the gas insulated switchgear 3, And transmits the signal sensed by the plurality of sensors to the main body 50 of the partial discharge diagnostic apparatus through a single cable 40. [ At this time, the partial discharge diagnosis apparatus according to the present invention can simultaneously measure the partial discharge signals using the respective sensors. The main body 50 of the partial discharge diagnostic apparatus synchronizes the signals measured by the sensors with the power phase and analyzes data collected by the internal algorithm to determine whether the partial discharge has occurred and the type of the partial discharge Display. Here, the screen of the main body 50 of the partial discharge diagnostic apparatus is constituted by a phase axis, a magnitude axis and a time axis, and displays a waveform form of the signal. The waveform of the signal is expressed by a maximum value of partial discharge, a partial discharge occurrence frequency (PPS) Additional information such as the partial discharge occurrence frequency (PPC) value can also be displayed.

4 is a block diagram illustrating a configuration of a partial discharge diagnosis apparatus according to an embodiment of the present invention.

Referring to FIG. 4, a partial discharge diagnosis apparatus according to an embodiment of the present invention includes a sensor unit 30, a cable 40, and a main body 50.

The sensor unit 30 senses a signal generated from the high voltage power device and transmits the detected signal to the main body 50 through the cable 40. [ The sensor unit 30 includes an ultra-sonic sensor 30a, an HFCT sensor 30b, a TEV sensor 30c, and a UHF sensor 30d. The user who wants to measure the partial discharge of the high voltage power device selects at least one of the Ultra-sonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c and the UHF sensor 30d of the sensor unit 30 And the selected one or more sensors are installed in the high-voltage power device to perform the diagnosis of the partial discharge.

The ultrasonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c, and the UHF sensor 30d have different ranges of frequencies of the measurement target signals. The frequency of the main measurement target signal for each sensor The ranges are shown in Table 1 below.

The main body 50 includes a sensor-specific module 100, a synchronization signal unit 200, a signal processing unit 300, a control unit 400, a measurement selection unit 500, a display unit 600, a communication unit 700, (800).

The sensor-specific module 100 measures the partial discharge of the high-voltage power device among the Ultra-sonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c and the UHF sensor 30d of the sensor section 30 The measured signals from the selected sensors are sampled and converted into digital signals to collect data for diagnosing partial discharge types.

Here, the sensor-specific module 100 includes an Ultra-sonic sensor 30a for extracting a signal having a frequency band corresponding to a measurement frequency range (20 kHz to 500 kHz) of the ultrasonic sensor 30a, A sensor module, or a HFCT sensor module or TEV sensor 30c that can extract and sample signals having frequency bands corresponding to the frequency range (3 MHz to 30 MHz) of the HFCT sensor 30b, (500MHz to 1500MHz) of the UHF sensor 30d or a TEV sensor module that can extract and sample a signal having a frequency band corresponding to the measurement frequency range (3MHz to 100MHz) of the UHF sensor 30d A UHF sensor module that can extract and sample a signal having a corresponding frequency band and convert the sampled signal into a digital signal.

The synchronizing signal section 200 acquires an externally input synchronizing signal, for example, a synchronizing signal of 60 Hz at the ground in order to use it as a synchronizing signal of the partial discharge diagnosis apparatus according to the present invention.

The signal processing unit 300 stores the data for diagnosing the partial discharge type collected by the sensor-specific module 100 in the data storage unit 800 in accordance with the synchronization signal acquired by the synchronization signal unit 200 And the signal data corresponding to each of the partial discharge types (protruding electrode defects, free conductor defects, floating electrode defects, spacer defects, etc.) .

The control unit 400 controls the respective components of the signal processing unit 300, the synchronization signal unit 200, and the like of the main body 50 of the partial discharge diagnosis apparatus according to the present invention.

The measurement selecting unit 500 selects one or more of the sensors of the sensor unit 30 by the user who wants to measure the partial discharge of the high voltage power device, The analysis result of the partial discharge signal is derived and provided to the signal processing unit 300 to display the measurement target signal through the display unit 600. [

The display unit 600 displays the analysis result of the partial discharge signal derived by the signal processing unit 300 on the screen of the partial discharge diagnostic apparatus according to the present invention.

The communication unit 700 transmits an analysis result of the partial discharge signal derived by the signal processing unit 300 to the external device according to a command of the user who wants to measure the partial discharge of the high voltage power supply.

The data storage unit 800 compares the data for diagnosing the partial discharge type collected by the sensor-specific module 100 with the signal data corresponding to each partial discharge type by the signal processing unit 300, The signal data corresponding to each of the partial discharge types is stored. In addition, the data storage unit 800 stores the analysis result of the partial discharge signal derived by the signal processing unit 300, thereby enabling the user to manage the history of the partial discharge diagnosis.

FIG. 5 is a block diagram for explaining a configuration of a sensor-specific module 100 in a partial discharge diagnosis apparatus according to an embodiment of the present invention.

5, the sensor-specific module 100 includes a filter unit 110, an amplification unit 120, a peak-hold unit 130, an A / D A converter 150 and a reset unit 140.

The filter unit 110 is selected to measure the partial discharge of the high voltage power device among the Ultra-sonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c and the UHF sensor 30d of the sensor unit 30. [ A signal received from the at least one sensor is received through a single cable 40 and only a signal having a frequency band corresponding to the frequency range of the selected target signal for each sensor is filtered do. As the filter unit 110 filters only the signals having the frequency band corresponding to the frequency range of the frequency of the target signal to be measured for each sensor, the user can control the ultrasonic sensor 30a, the HFCT sensor 30b, When a partial discharge is to be measured by using a plurality of sensors among the plurality of sensors 30c and 30d, the partial discharge diagnosis apparatus according to the present invention can detect the partial discharge by using a single cable 40, Signals are transmitted to the sensor-specific module 100, signals for the respective sensors can be separately processed.

The amplifying unit 120 amplifies the signal having the frequency band corresponding to the range of the frequency of the signal to be measured for each sensor filtered by the filter unit 110.

The peak-hold unit 130 samples a sensor-specific measurement signal amplified by the amplifier unit 120, and stores the sampled signal until the next sample signal is sampled.

When the A / D converter 150 converts the sample signal stored in the peak-and-hold unit 130 into a digital signal, the reset unit 140 resets the sample value stored in the peak- To '0' to reset the peak-hold unit 130 to store the next sample signal.

The A / D converter 150 converts the analog sample signal stored in the peak-hold unit 130 into a digital sample signal, and transmits the digital sample signal to the signal processing unit 300.

6 is a view for explaining a concept that a sensor-specific module is inserted into a main body in a partial discharge diagnosis apparatus according to an embodiment of the present invention.

Referring to FIG. 6, when a user who wants to measure the partial discharge of the high voltage power device selects at least one sensor among the sensors of the sensor unit 30 and installs the selected one or more sensors in the high voltage power device, The diagnosis of the partial discharge is started after inserting the module 100 for each sensor corresponding to the sensor into the main body 50.

More specifically, if the user selects one or more of the Ultra-sonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c and the UHF sensor 30d and installs the selected one or more sensors in the high voltage power device An ultrasonic sensor module 100a for extracting and sampling a signal having a frequency band corresponding to the measurement frequency range (20 kHz to 500 kHz) of the ultrasonic sensor 30a and converting the sampled signal into a digital signal, a HFCT sensor HFCT sensor module 100b that can extract and sample a signal having a frequency band corresponding to the measurement frequency range (3 MHz to 30 MHz) of the TEV sensor 30b, 30b, A TEV sensor module 100c that can extract and sample a signal having a frequency band corresponding to the frequency band corresponding to the frequency band of the UHF sensor 30d, ≪ / RTI > Output will be sampled and diagnosing the partial discharge by inserting the body 50 as a module 100 for the module sensor corresponding to the at least one sensor selected by the user of the UHF sensor module (100d) for to be converted into a digital signal. For example, if the HFCT sensor 30b and the TEV sensor 30c are selected to diagnose the partial discharge of the high voltage power device, the HFCT sensor module and the TEV sensor module may be connected to the main body 30 as the sensor- .

The module 100 for each sensor has the same shape and the module insertion unit for each sensor of the main body 30 is provided according to the number of the modules 100 for each sensor, So that the partial discharge can be diagnosed.

7 is a flowchart showing a partial discharge diagnosis method according to the present invention.

Referring to FIG. 7, a partial discharge diagnosis method according to the present invention includes measuring a signal of a transient ground voltage, a high frequency current, an ultrasonic wave, and an electromagnetic wave of a UHF band generated by a partial discharge inside a high voltage power device, (Step S100).

Next, it is possible to detect a measurement target signal selected in step S100, among the Ultra-sonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c and the UHF sensor 30d of the sensor unit 30 One or more sensors having a certain measurement frequency range are selected (S200).

If a specific one of the Ultra-sonic sensor 30a, the HFCT sensor 30b, the TEV sensor 30c and the UHF sensor 30d is selected in step S200, the module for the ultrasonic sensor 100a, the module for the HFCT sensor 30a, The sensor-specific module 100 corresponding to the specific sensor among the modules 100a, 100b, TEV sensor module 100c, and UHF sensor module 100d is selected (S300).

In step S400, the selected sensor 100 in step S300 is inserted into the main body 50 of the partial discharge diagnostic apparatus 50. In step S500, the selected sensor is installed in the high voltage power device in step S500. And the sensors 100 installed in the main body 50 of the partial discharge diagnostic apparatus 50 are connected to each other by the cable 40 (S600).

Upon completion of the measurement preparation in steps S100 to S600 for detecting the partial discharge signal of the high voltage power device, the signal is measured through the sensor installed in the high voltage power device and transmitted to the sensor-specific module 100, In the transmitted signal, the measurement target signal selected in step S100 is filtered and sampled, converted into a digital signal, and processed (S700).

The signals processed in the step S700 are collected as data for diagnosing the partial discharge and transmitted to the signal processing unit 300. The signal processing unit 300 calculates the partial discharge types (protruding electrode defects, free conductor defects , A floating electrode defect, a spacer defect, and the like) to generate a diagnosis result of whether or not a partial discharge has occurred and a diagnosis result of the generated partial discharge, and displays the diagnosis result to the user through the display unit 600 (S800)

FIG. 8 is a view showing an initial screen of the display unit 600 of the partial discharge diagnosis apparatus according to the present invention. FIG. 9 is a diagram showing an initial screen of the partial discharge diagnostic apparatus according to the present invention. FIG. 10 is a view showing a screen of the display unit 600 of the partial discharge diagnosis apparatus according to the present invention when a protruding electrode defect is generated, and FIG. 11 is a view showing a part 6 is a view showing a screen of the display unit 600 of the discharge diagnosis apparatus.

12 is a flowchart specifically showing the step S700 in the partial discharge diagnosis method according to the present invention.

Referring to FIG. 12, in operation S700, a partial discharge signal generated in the high voltage power supply is detected through a specific sensor of the sensor unit 30 (S710). In step S720, the filter unit 110 of the sensor-specific module 100 acquires only the signal of the frequency band corresponding to the measurement frequency range of the specific sensor from the signal detected through the specific sensor of the sensor unit 30.

The signal obtained in step S720 is amplified by the amplifier 120 and input to the peak-hold unit 130. The peak-hold unit 130 samples the amplified signal and stores the sampled value as an analog sample value S730).

Then, the A / D converter 150 converts the analog sample value stored in the peak-hold unit 130 into a digital sample value in step S730, The previously stored sample value is reset to '0' so that the hold unit 130 can store the next sample value (S750).

In operation S760, the converted digital sample values are accumulated in operation 740, and it is determined whether the accumulated digital sample values are accumulated as sample values corresponding to one period in operation S770. Here, the number of sample values corresponding to one period may be, for example, 64 samples. However, the number of sample values exemplified above is only one example, and is not limited thereto, and can be adjusted as needed.

If it is determined in step S770 that the sample values corresponding to one period are not accumulated, the steps S720 to S760 are continuously performed. If the sample values corresponding to one period are accumulated, 300 to analyze the partial discharge signal (S780).

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

30:
30a: Ultra-sonic sensor 30b: HFCT sensor
30c: TEV sensor 30d: UHF sensor
40: Cable
50: partial discharge diagnostic apparatus body
100: Sensor-specific module
100a: Ultra-sonic sensor module 100b: HFCT sensor module
100c: TEV sensor module 100d: UHF sensor module
200: Sync signal part
300: Signal processor
400:
500: Measurement selection unit
600:
700:
800: Data storage unit

Claims (20)

An apparatus for diagnosing a partial discharge of a high-voltage power device,
A plurality of sensors having different ranges of frequency of the measurement target signal;
A plurality of sensor-specific modules for sampling signals detected by the plurality of sensors and converting the signals into digital signals; And
And a signal processing unit for processing the digital signal converted from the plurality of sensor-specific modules and analyzing the type of the partial discharge,
Wherein each sensor-specific module of the plurality of sensor-specific modules has a frequency band corresponding to a frequency range of a signal to be measured of a specific sensor from signals detected by the plurality of sensors whose frequency ranges of the measurement subject signal are different from each other And a filter for extracting a signal,
Selecting one or more sensors from the plurality of sensors to be installed in the high voltage power device, inserting a sensor-specific module corresponding to the selected one or more sensors into the portable main body to measure the partial discharge of the high voltage power device,
Each of the plurality of sensors collects a signal from a sensor of a type corresponding to a sensor-specific module, and the plurality of sensors includes an Ultra-sonic sensor, a High Frequency Current Transformer (HFCT) sensor, a Transient Earth Voltage (TEV) (Ultra High Frequency) sensor,
Further comprising a synchronization signal unit for acquiring an externally inputable synchronization signal,
The signal processing unit compares data for diagnosing the type of the partial discharge signal with the synchronous signal acquired by the synchronous signal unit and compares the data with the signal data corresponding to the stored partial discharge type,
The partial discharge type generated through the derivation of the analysis result is displayed on a screen, and the screen is composed of a phase axis, a magnitude axis and a time axis, The partial discharge diagnosis apparatus comprising: The method according to claim 1,
Wherein each sensor-specific module of the plurality of sensor-
And a peak-hold section for storing the previous sample signal until the next sample signal is sampled from the signal detected by the sensor. The method of claim 2,
Wherein each sensor-specific module of the plurality of sensor-
And a reset unit for resetting a previous sample signal stored in the peak-hold unit so that the next sample signal can be stored in the peak-hold unit when the previous sample signal is converted into a digital signal Wherein the partial discharge diagnostic apparatus comprises: The method according to claim 1,
Wherein each sensor-specific module of the plurality of sensor-
Sampling the signal extracted by the filter for a predetermined period, converting the sampled signal into a digital signal, collecting the converted digital signal for the predetermined period, and transmitting the collected digital signal to the signal processing unit. The method according to claim 1,
The signal processing unit,
Comparing the digital signal converted from the plurality of sensor-specific modules with signals corresponding to the stored partial discharge types, and diagnosing the partial discharge type for the signal detected by the plurality of sensors. Discharge diagnostic device. delete delete delete delete The method according to claim 1,
Wherein the plurality of sensors are connected to the plurality of sensor-specific modules by a single cable. A method for diagnosing a partial discharge of a high voltage power device,
Selecting one or more sensors among a plurality of sensors whose frequency ranges of a measurement object signal are different from each other to detect a partial discharge signal from the high voltage power device;
And at least one of the plurality of sensors, which is inserted into the portable main body and is capable of extracting a signal having a frequency band corresponding to a frequency range of a frequency of a measurement target signal of the specific sensor from the partial discharge signals detected by the selected one or more sensors Extracting a signal having a frequency band corresponding to a frequency range of a measurement target signal for each sensor using a sensor-specific module;
Sampling the partial discharge signal extracted by the sensor-specific module and converting the sampled partial discharge signal into a digital signal; And
And processing the converted digital signal to analyze the type of partial discharge signal for the partial discharge signal detected by the selected one or more sensors,
One sensor-specific module collects signals from sensors of a type corresponding to the sensor-specific module, and the plurality of sensors include at least one of an Ultra-sonic sensor, a HFCT sensor, a TEV sensor, and a UHF sensor,
Wherein the analysis step compares the data for diagnosing the type of the partial discharge signal with the signal data corresponding to each of the partial discharge types according to the synchronization signal acquired from the outside,
Wherein the partial discharge type generated through the derivation of the analysis result is displayed on a screen, and the screen comprises a phase axis, a magnitude axis, and a time axis, and the waveform type of the signal is displayed. The method of claim 11,
Wherein the step of sampling the partial discharge signal extracted by the sensor-specific module and converting the sampled partial discharge signal into a digital signal comprises:
Storing the previous sample signal until the next sample signal is sampled from the partial discharge signal detected by the sensor
The partial discharge diagnosis method comprising the steps of: The method of claim 12,
Wherein the step of sampling the partial discharge signal extracted by the sensor-specific module and converting the sampled partial discharge signal into a digital signal comprises:
Resetting the previously stored sample signal so that the next sample signal can be stored when the previous sample signal is converted into a digital signal
The partial discharge diagnosis method further comprising: The method of claim 11,
Wherein the step of sampling the partial discharge signal extracted by the sensor-specific module and converting the sampled partial discharge signal into a digital signal comprises:
Sampling the partial discharge signal extracted by the sensor-specific module for a predetermined period, converting the sampled partial discharge signal into a digital signal, and collecting the converted digital signal for the preset period
The partial discharge diagnosis method comprising the steps of: The method of claim 11,
Wherein analyzing the type of the partial discharge signal for the partial discharge signal detected by the selected one or more sensors comprises:
Comparing the digital signal converted from the partial discharge signal extracted by the sensor-specific module with the signals corresponding to the stored partial discharge types, and diagnosing the partial discharge type for the signal detected by the plurality of sensors
The partial discharge diagnosis method comprising the steps of: delete delete delete delete The method of claim 11,
Wherein the selected one or more sensors are connected to the corresponding one or more sensor-specific modules by a single cable.

Images