WO2018105913A1 - Appareil et procédé de détection de la décharge d'un équipement électrique - Google Patents

Appareil et procédé de détection de la décharge d'un équipement électrique Download PDF

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Publication number
WO2018105913A1
WO2018105913A1 PCT/KR2017/012827 KR2017012827W WO2018105913A1 WO 2018105913 A1 WO2018105913 A1 WO 2018105913A1 KR 2017012827 W KR2017012827 W KR 2017012827W WO 2018105913 A1 WO2018105913 A1 WO 2018105913A1
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WO
WIPO (PCT)
Prior art keywords
discharge
ultrasonic
signal
wireless communication
communication unit
Prior art date
Application number
PCT/KR2017/012827
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English (en)
Korean (ko)
Inventor
윤대근
Original Assignee
한국알프스 주식회사
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Publication of WO2018105913A1 publication Critical patent/WO2018105913A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/04—Arrangements for displaying electric variables or waveforms for producing permanent records
    • G01R13/14—Recording on a light-sensitive material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings

Definitions

  • the present invention relates to an apparatus and method for detecting discharge of a power plant, and more particularly, to an apparatus and method for detecting partial discharge of insulator using an ultrasonic sensor.
  • Power transmission power equipment is a power transmission or substation that transmits electricity produced in a power plant to large-scale users such as cities, and is installed with power equipment including transformers using high pressure and extra high pressure (over tens of thousands of volts).
  • Figure 1 shows an example of such a power equipment.
  • a power line 10 is connected to a transformer 20 to a pole, and an insulator 30 is installed between the pole and the power line 10.
  • the insulator (30) which is a solid insulator used to insulate and support an electric conductor, should not flow current as a complete insulator, but the insulation is destroyed due to deterioration, resulting in partial discharge.
  • Such partial discharge phenomenon may increase the degree of insulation deterioration due to oxides generated during electric tree and partial discharge when it occurs for a long time even if there is no problem in the performance and operation of the system.
  • Such insulation deterioration may cause the power equipment to stop functioning, and in extreme cases, it may lead to an explosion, causing a problem such as a power failure (shutdown) to stop the supply of electricity to the entire city or industrial complexes, etc. This paralyzing fatal situation will occur.
  • Ultrasonic diagnostic device is a device that a diagnoser (user) hears a sound and diagnoses it by converting ultrasonic waves that are inaudible to humans into sounds in an audible frequency range.
  • the problem to be solved by the present invention is to provide an apparatus and method that can detect whether the ultrasonic wave is generated automatically when installed around the pole to diagnose whether or not the partial discharge.
  • the problem to be solved by the present invention is to provide an apparatus and method for quickly and accurately diagnosing partial discharge by efficiently removing ultrasonic waves (noise) generated in the car, wind, etc. around the pole.
  • Discharge detection apparatus of a power equipment is disposed on the pole and the ultrasonic sensor for detecting the ultrasonic signal generated by the deterioration of the power equipment;
  • a discharge detector determining a discharge state when a frequency of the ultrasonic signal detected by the ultrasonic sensor is included in a preset frequency range;
  • a wireless communication unit configured to receive a signal regarding discharge from the discharge detection unit and transmit the received signal to the outside, and transmit a control signal received from the outside to the discharge detection unit.
  • the discharge detection device of the power equipment may be composed of the sensor unit, the discharge detection unit and the wireless communication unit integrated module.
  • the ultrasonic sensor, the discharge detector, and a power supply unit for supplying power to the wireless communication unit may further include.
  • the ultrasonic sensor is disposed around the insulator, it can detect the ultrasonic wave generated in the insulator.
  • the predetermined frequency range may be set within a predetermined range around 120Hz.
  • the discharge detection unit includes an IIR filter for passing a frequency of 120Hz band, when the peak value of the frequency passing through the IIR filter is more than a predetermined value to the discharge state You can judge.
  • the discharge detection unit may operate in a sleep state after transmitting a signal on whether or not discharged through the wireless communication unit.
  • the discharge detection unit may receive the ultrasonic signal from the ultrasonic sensor in excess of the time required to stabilize the IIR filter.
  • the ultrasonic sensor detects the ultrasonic signal generated by the deterioration of the power equipment; Receiving a detected ultrasonic signal by a discharge detector, and determining the discharge state when the detected ultrasonic signal is included in a preset frequency range; And receiving, by the wireless communication unit, a signal regarding discharge from the discharge detection unit and transmitting the received signal to the outside.
  • the determining of the discharge state, the ultrasonic signal detected by the ultrasonic sensor using an IIR filter, and the size of the filtered data is more than a predetermined size. In this case, it can be determined as a discharge state.
  • the IIR filter can pass a predetermined band around 120Hz.
  • the present invention it is possible to easily detect the partial discharge of the power equipment, in particular the insulator.
  • an effect of shortening the measurement time can be obtained by using an IIR filter instead of using the FFT frequency analysis.
  • the microprocessor since the microprocessor wakes up and operates only when receiving the sensor signal in the sleep mode, power consumption may be reduced.
  • the present invention it is possible to check the presence or absence of partial discharge of the power equipment from a remote site by receiving data through a wireless communication unit without directly measuring a person. Therefore, the cost can be reduced and the presence of discharge can be easily confirmed.
  • Figure 1 shows a power installation according to the prior art.
  • FIG. 2 is a block diagram showing a power equipment discharge detection apparatus according to an embodiment of the present invention.
  • FIG 3 shows an example in which the power equipment discharge detection apparatus according to the present invention is installed.
  • FIG. 4 is a flowchart illustrating a power equipment discharge detection method according to the present invention.
  • FIG. 5 is a flowchart illustrating the discharge detection step of FIG. 4 in more detail.
  • Figure 6 shows the simulation results of the power equipment discharge detection equipment according to the present invention.
  • FIG. 2 is a block diagram showing a discharge detection device of a power facility according to the present invention.
  • the apparatus 100 for detecting discharge of power facilities may include a sensor unit 110, a discharge detector 120, a wireless communication unit 130, and a power supply unit 140.
  • the sensor unit 110 may include an ultrasonic sensor and an amplifier (AMP), the ultrasonic sensor detects the ultrasonic wave generated in the power equipment, the amplifier amplifies the detected signal and delivers it to the discharge detector.
  • the power plant may be a transformer or insulator. In particular, since insulators are completely insulators, no current flows and no ultrasonic waves are generated under normal conditions. However, if the insulators deteriorate and the insulation breaks down, some current can flow. That is, ultrasonic waves are generated by the partial discharge.
  • the sensor unit 110 may detect ultrasonic waves generated from the insulator.
  • the discharge detector 120 may detect whether the battery is discharged, in particular, whether the battery is partially discharged by receiving the ultrasonic signal detected by the sensor 110.
  • the frequency of the ultrasonic waves generated by the partial discharge is related to the frequency of the alternating current flowing in the power plant. For example, since the frequency of the AC potential of the Republic of Korea is 60Hz, the period of partial discharge is 120Hz. Therefore, the discharge detector 120 determines that the partial discharge occurs when the frequency of the ultrasonic wave detected by the sensor unit 110 is within a predetermined bandwidth around 120 Hz.
  • the discharge detector 120 may be implemented by a microprocessor such as an MCU.
  • the MCU may wake up at regular intervals to reduce battery power consumption, and may turn off the power of the ultrasonic sensor unit 110 in addition to the time for processing and transmitting sensor data and reading sensor values. After the sensor is powered off, the controller enters the sleep mode again.
  • the MCU may control operations of the sensor unit and the wireless communication unit in addition to the discharge detection.
  • the MCU that is, the discharge detector 120 may include a filter that passes only the frequency of the 120Hz band and the frequency of the remaining bands noise processing.
  • a filter can be implemented by software.
  • the filter may be implemented using a digital band pass filter such as a Butterworth filter, and may be an Infinite Impulse Response Filer (IIR) filter.
  • IIR Infinite Impulse Response Filer
  • the IIR filter may be an IIR filter of more than 4th order to increase the filtering efficiency.
  • the ultrasonic signal may be generated by other signals around the insulator.
  • the filter may remove the ultrasonic wave generated by the other signal by noise processing and pass only the ultrasonic signal by the partial discharge.
  • the discharge detector 120 detects a peak value of the signal passing through the filter and transmits the peak value to the outside through the wireless communication unit 130. In addition, when the peak value is larger than the set reference value, the discharge detector 120 may determine that partial discharge has occurred. For example, when the detected peak value is 0.5 or more, it may be determined that partial discharge has occurred.
  • the discharge detection unit 120 reads the sensor value at a speed of 240 Hz or more that is twice as fast as 120 Hz (for example, 500 Hz), and the data for a time longer than the filter stabilization time (for example, 0.5 seconds). Can be obtained.
  • the acquired data only a signal with a fixed bandwidth is passed around 120 Hz, and a peak value is extracted from the passed signal, and when the peak value is larger than a predetermined reference value, it may be determined that partial discharge has occurred.
  • the peak value is transmitted to the outside through the wireless communication unit.
  • the filter stabilization time is the minimum time for the IIR filter to operate normally. Since the filter stabilization time is very short, about 0.1, it is possible to detect whether the discharge is efficient.
  • FFT Fast Fourier Transform
  • frequency analysis may be used as a method for detecting a frequency, but FFT analysis requires more time for frequency analysis than an IIR filter.
  • the filter stabilization time is only 0.1 second, and the data can be detected and analyzed for only 0.1 second or more to detect the partial discharge.
  • the experiment confirmed that the peak frequency can be clearly detected at 120Hz when the FFT process is performed on the same signal.
  • the signal processing time is reduced, thereby reducing the power consumption of the battery by reducing the operation time of the MCU (discharge detection unit) and the power-on time of the sensor unit.
  • the use of FFT requires a 32-bit or higher specification processor, but the IIR filter can handle an 8-bit low-profile processor, resulting in lower implementation costs.
  • the wireless communication unit 130 may include a short range communication module such as Zigbee or Bluetooth, and may manage communication with a gateway.
  • various wireless communication methods may be used.
  • Internet modules such as a wireless local area network (WLAN) (Wi-Fi), a wireless broadband (Wibro), a world interoperability for microwave access (Wimax), and a high speed downlink packet access (HSDPA) may be used.
  • Zigbee and Bluetooth may be used as short-range communication methods, such as RFID (Radio Frequency Identification), Infrared Data Association (IrDA), Ultra Wideband (UWB), and the like.
  • the power supply unit 140 may supply power to the sensor unit 110, the discharge detection unit 120, and the wireless communication unit 130.
  • the sensor unit 110, the discharge detector 120, the wireless communication unit 130, and the power supply unit described above may be configured as an integrated module.
  • FIG 3 shows an example in which the discharge diagnosis apparatus 100 according to the present invention is installed.
  • the discharge diagnosis apparatus 100 may be installed near the insulator of the electric pole to detect ultrasonic waves generated from the insulator, and diagnose whether or not the partial discharge is based on the ultrasonic signal.
  • the intensity and the detection result of the ultrasonic signal can be transmitted to the server through the wireless communication unit, the server can receive it to identify the insulators that have occurred.
  • FIG. 4 is a flowchart illustrating a discharge diagnosis method of a power facility according to the present invention.
  • a MCU in a sleep mode state that is, a wake up detection unit wakes up (S110).
  • the discharge detector wakes up
  • the sensor is turned on (S120) and receives a sensor signal detected by the ultrasonic sensor (S130). That is, the sensor value is detected by detecting the discharge (S140), and enters the sleep mode again (S150).
  • FIG. 5 illustrates the discharge detection step S140 of FIG. 4 in more detail.
  • the sensor data is first filtered (S142).
  • an IIR filter may be used as a filter.
  • the IIR filter may be used to remove noise by passing only a band in a preset range (120 Hz when the frequency of the alternating potential is 60 Hz) and filtering the remaining frequencies. This is to remove the ultrasonic waves generated by factors other than the discharge.
  • the MCU may turn off the sensor (S144). Turning off the sensor is to reduce the battery consumption of the power supply.
  • the amplitude of the filtered data is detected and the peak value is detected. If the peak value is equal to or greater than the preset reference value, it may be determined that partial discharge has occurred. For example, when the peak value is 0.5 or more, it can be determined that partial discharge has occurred. Discharge detection procedures such as filtering, peak value detection, and partial discharge generation may be performed at the MCU.
  • the MCU may transmit a detection result to a server (not shown) through the wireless communication unit.
  • the server receives such data from the discharge detection device 100 arranged near the plurality of insulators, and can easily detect where the abnormality has occurred.
  • Figure 6 is a simulation result for verifying the effect of the present invention
  • Figure 6 (a) is a case of detecting a partial discharge by applying the IIR filter
  • Figure 6 (b) is a partial discharge through the FFT frequency analysis The case where is detected is shown.
  • the filter when the IIR filter is applied, the filter is stabilized after the filter stabilization time, that is, 0.108 seconds, to detect the partial discharge by processing the received sensor signal normally.
  • the partial discharge detection time can be facilitated and the cost can be reduced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

La présente invention concerne la détection d'une décharge partielle d'un équipement électrique, et un appareil de détection de décharge selon la présente invention peut comprendre: un capteur ultrasonore qui est disposé sur un pôle électrique de façon à détecter un signal ultrasonore provoqué par la détérioration de l'équipement électrique; une unité de détection de décharge pour déterminer que l'équipement électrique est dans un état déchargé, quand la fréquence du signal ultrasonore détecté par le capteur ultrasonore tombe dans une plage de fréquences prédéterminée; et une unité de communication sans fil pour recevoir un signal, qui indique si l'équipement électrique est déchargé, provenant de l'unité de détection de décharge et le transmettre à l'extérieur, et délivrer un signal de commande, reçu depuis l'extérieur, à l'unité de détection de décharge.
PCT/KR2017/012827 2016-12-06 2017-11-14 Appareil et procédé de détection de la décharge d'un équipement électrique WO2018105913A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2016-0165252 2016-12-06
KR1020160165252A KR101959708B1 (ko) 2016-12-06 2016-12-06 전력설비의 방전 검출 장치 및 방법

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KR102457493B1 (ko) * 2022-07-27 2022-10-21 윤성전력(주) 배전선로 내장애자 감시 IoT시스템

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101200053B1 (ko) * 2012-03-08 2012-11-12 주식회사 현신 전력설비용 변압기와 애자의 진행성 이상상태 실시간 진단장치 및 그 방법
KR101410733B1 (ko) * 2013-01-10 2014-06-24 한국전기연구원 레퍼런스 마이크를 이용한 부분방전 측정 장치 및 방법
KR101538999B1 (ko) * 2014-06-26 2015-07-24 (주)에스에이치아이앤씨 부분방전 진단장치
US20160161543A1 (en) * 2014-12-09 2016-06-09 Rosemount Inc. Partial discharge detection system
KR101647424B1 (ko) * 2015-12-30 2016-08-16 주식회사 알씨엔파워 전력설비의 자동 진단장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101200053B1 (ko) * 2012-03-08 2012-11-12 주식회사 현신 전력설비용 변압기와 애자의 진행성 이상상태 실시간 진단장치 및 그 방법
KR101410733B1 (ko) * 2013-01-10 2014-06-24 한국전기연구원 레퍼런스 마이크를 이용한 부분방전 측정 장치 및 방법
KR101538999B1 (ko) * 2014-06-26 2015-07-24 (주)에스에이치아이앤씨 부분방전 진단장치
US20160161543A1 (en) * 2014-12-09 2016-06-09 Rosemount Inc. Partial discharge detection system
KR101647424B1 (ko) * 2015-12-30 2016-08-16 주식회사 알씨엔파워 전력설비의 자동 진단장치

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KR20180064851A (ko) 2018-06-15

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