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WO2013160991A1 - Procédé d'estimation de scintillation - Google Patents

Procédé d'estimation de scintillation Download PDF

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Publication number
WO2013160991A1
WO2013160991A1 PCT/JP2012/060877 JP2012060877W WO2013160991A1 WO 2013160991 A1 WO2013160991 A1 WO 2013160991A1 JP 2012060877 W JP2012060877 W JP 2012060877W WO 2013160991 A1 WO2013160991 A1 WO 2013160991A1
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WO
WIPO (PCT)
Prior art keywords
insulator
scintillation
time
voltage
acoustic signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/060877
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English (en)
Japanese (ja)
Inventor
伸二 河本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chugoku Electric Power Co Inc
Original Assignee
Chugoku Electric Power Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chugoku Electric Power Co Inc filed Critical Chugoku Electric Power Co Inc
Priority to JP2014512049A priority Critical patent/JP5719970B2/ja
Priority to PCT/JP2012/060877 priority patent/WO2013160991A1/fr
Publication of WO2013160991A1 publication Critical patent/WO2013160991A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
    • 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
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/0289—Internal structure, e.g. defects, grain size, texture

Definitions

  • the present invention relates to a method for estimating scintillation that is a precursor of tracking deterioration in insulators such as insulators.
  • a plurality of power devices are installed and operated in the switchgear of the substation.
  • grasp the precursors of tracking a phenomenon that starts with electric leakage and leads to dielectric breakdown).
  • Tracking is a phenomenon in which the insulation resistance is lowered on the surface of the insulating material, leakage current is generated, and further, dielectric breakdown is caused by a short circuit or a ground fault.
  • Patent Document 1 in order to detect discharge tracking, in a cable terminal device, a high-frequency component of a ground line current is used as a tracking signal and a low-frequency component is used as a commercial signal, and a ratio between the tracking signal and the commercial signal is disclosed.
  • a method has been proposed in which tracking is determined to occur when the value exceeds a threshold.
  • Patent Document 1 if the method of Patent Document 1 is applied to an insulator made of an organic material (for example, an epoxy insulator) installed in a switchgear, there are the following problems.
  • the present invention has been made in view of the above problems, and its main purpose is to detect tracking deterioration of an insulator at an early stage.
  • the present invention provides a method for estimating the occurrence of scintillation, which is a precursor of surface degradation of an insulator, the step of applying a voltage to the insulator, and the insulation applied with the voltage A step of measuring an acoustic signal generated from an object, and a step of estimating that the scintillation has occurred when a vibration width of the measured acoustic signal exceeds a predetermined value.
  • this method when a voltage is applied to an insulator whose surface insulation has begun to deteriorate, a crackling sound is generated along with discharge as a sign of deterioration (scintillation).
  • an acoustic signal generated from an insulator to which a voltage is applied is measured, and it is estimated that scintillation has occurred if the vibration width of the measured acoustic signal is greater than a predetermined value. According to this, the deterioration can be detected at an early stage by reliably grasping the precursor phenomenon of the surface deterioration of the insulator. Since the measurement value of the acoustic signal is used, scintillation can be detected with high sensitivity even in an environment with high electrical noise.
  • the present invention also relates to a method (scintillation estimation method) for estimating the occurrence of scintillation which is a precursor of surface deterioration of an insulator, the step of applying a voltage to the insulator, and the insulator to which the voltage is applied Using two microphones in the same direction and different distance from the step of measuring the acoustic signal generated from the insulator, and the vibration width of the acoustic signal measured by the two microphones exceeds a predetermined value,
  • the difference in each time when the vibration width of the acoustic signal exceeds a predetermined value is a time value corresponding to the distance between the two microphones, it is estimated that the scintillation has occurred in the insulator.
  • the vibration widths of the acoustic signals both exceed a predetermined value, and the difference between the times is the two A time value corresponding to the distance between the two microphones
  • a step of obtaining a distance between one of the two microphones and the insulator, and the insulation by a commercial power source A step of measuring a voltage applied to an object, and a time obtained by subtracting a time value corresponding to the acquired distance from a time when an acoustic signal measured by the one microphone exceeds the predetermined value.
  • the phase of the voltage at the estimated time is approximately 90 degrees or 270 When it is, it may be estimated with a scintillation occurs in the insulator.
  • the stress on the insulator is maximized when the voltage reaches a peak value, that is, a maximum amplitude, so that scintillation is likely to occur.
  • the AC voltage has the maximum amplitude when the phase is 90 degrees corresponding to the positive peak value and the phase is 270 degrees corresponding to the negative peak value.
  • the vibration widths of the acoustic signals both exceed a predetermined value, and the difference between the times is the two Measuring the ground line current of the insulator when the time value according to the distance between the microphones, and specifying the strength of the high frequency component of the ground line current at the estimated time, It is good also as estimating that the scintillation generate
  • scintillation is a phenomenon that occurs when a voltage is applied to an insulator, where the insulation is weak and discharge is likely to occur. It is considered that the distribution follows the Weibull distribution (weakest point distribution) indicating the relationship with the probability of occurrence.
  • the grounding current of the insulator becomes high frequency. According to this, at the time when it is estimated that scintillation has occurred in the insulator, the strength of the high-frequency component of the ground line current is specified, and when the specified current strength and the frequency of occurrence follow the Weibull distribution, the insulation It can be said that the estimation of the occurrence of scintillation in an object has become more reliable.
  • tracking deterioration of the insulator can be detected at an early stage.
  • FIG. (A) shows the change of the voltage applied to the insulator 1
  • (b) shows the change of the ground line current of the insulator 1
  • (c) shows an enlarged view of the broken line part of (b).
  • (A) shows the acoustic signal of the insulator 1
  • (b) shows an enlarged portion of the broken line part of (a)
  • (c) shows when (b) is divided into time blocks of about 1 msec unit, The difference between the maximum value and the minimum value of the acoustic signal in each time block is shown.
  • It is a flowchart which shows the procedure for detecting a scintillation.
  • an acoustic signal generated by applying a voltage is measured with two microphones, and the vibration width of the measured acoustic signal is equal to or larger than a predetermined value, and the acoustic signal is
  • the acoustic signal is
  • the scintillation signal can be accurately detected even in an environment where the S / N ratio of the current is poor, such as in the switchgear.
  • FIG. 1 is a diagram showing a configuration of an apparatus for detecting a scintillation signal generated in an insulator.
  • the insulator 1 is an insulating support installed in the switchgear and is a subject to be monitored whether or not scintillation has occurred.
  • the bus 2 is a commercial system (commercial power supply) that extends from the substation and supplies 6.6 kV power.
  • a voltage transformer 3 is installed between the upper part of the insulator 1 and the bus 2 and measures the voltage received by the insulator 1 from the bus 2 (hereinafter referred to as VT3).
  • the current transformer 4 (Current Transformer) 4 is provided on a ground line connecting the lower part of the insulator 1 and the ground, and measures a current flowing through the ground line (hereinafter referred to as CT4).
  • CT4 Current Transformer
  • the microphones M1 and M2 are installed from the one insulator 1 in the same direction and at a different distance, and measure the sound wave generated by the insulator 1. Then, it is checked whether or not there is a time correlation according to the distance between the microphones M1 and M2 between the acoustic signals received by the microphones M1 and M2. If there is a time correlation, scintillation may occur in the insulator 1 Judge that there is. Further, a predetermined distance is set between the microphone M1 closer to the insulator 1 and the insulator 1. This is to estimate the scintillation occurrence time in the insulator 1 by subtracting the time value corresponding to the distance from the measurement time of the acoustic signal in the microphone M1. Since the microphones M1 and M2 are portable, they are suitable for grasping the degradation site of the insulator 1.
  • a storage device and a display device are connected to the measurement devices of VT3, CT4, and microphones M1 and M2, respectively, so that changes over time of each measurement value are stored and displayed.
  • each measuring device is connected to one storage device and one display device via a network, and the temporal change of each measurement value is stored in a lump and displayed simultaneously on one screen. May be. Thereby, the person in charge of inspection can determine whether or not scintillation has occurred with reference to the temporal change of each measurement value displayed on the screen of the display device.
  • FIG. 2A shows the voltage applied to the insulator 1 measured by VT3.
  • 2 (b) and 2 (c) show the ground line current of the insulator 1 measured by CT4, and
  • FIG. 2 (c) is an enlarged view of the portion surrounded by the broken line in FIG. 2 (b).
  • 3A and 3B show the acoustic signal of the insulator 1 measured by the microphone M1, and
  • FIG. 3B is an enlarged view of the portion surrounded by the broken line in FIG. 3A.
  • FIG. 3C shows the difference (vibration width) between the maximum value and the minimum value of the acoustic signal in each time block when FIG. 3B is divided into time blocks in units of 1 msec.
  • the change in the voltage applied to the insulator 1 becomes a sine curve, and takes a positive peak value when the phase is 90 degrees. A negative peak value is obtained at a phase of 270 degrees. Then, scintillation is likely to occur in the insulator 1 when the applied voltage reaches a peak value. Therefore, in order to improve the estimation accuracy of scintillation, it is confirmed whether or not the time when scintillation is estimated to occur is near the phase of 90 degrees or 270 degrees.
  • the left peak value is due to scintillation
  • the right peak value is due to electrical noise fluctuations.
  • the noise may be larger than the scintillation signal. This is because a plurality of power devices are installed in the switch gear, and the ground line current includes not only the leakage current of the insulator 1 to be monitored but also currents from other power devices. Therefore, it can be said that it is difficult to discriminate scintillation using the magnitude relation of the ground line current.
  • the difference between the maximum value and the minimum value increased rapidly while constantly monitoring the maximum value and the minimum value of the acoustic signal in units of 1 msec (the difference was preset).
  • a scintillation peak is determined when the threshold value is exceeded. Since the speed of sound is about 340 mm / msec, assuming that the distance between the insulator 1 and the microphone M1 is 1 m as a premise of this embodiment, about 3 msec has passed since the scintillation signal appeared in the current signal measured by CT4. Sometimes the microphone M1 captures sound waves.
  • the ground line current about 3 msec before the sudden increase time of the acoustic signal is grasped, and the distribution state of the current intensity is confirmed.
  • FIG. 4 is a diagram showing the peak intensity distribution of the voltage applied to the insulator 1 when scintillation occurs.
  • the horizontal axis indicates the peak intensity (mV) of the applied voltage of the insulator 1
  • the vertical axis indicates the cumulative frequency (%) of scintillation occurrence at each voltage.
  • the scale on the vertical axis is used to determine whether the relationship between peak intensity and cumulative frequency is a Weibull distribution. Is set.
  • the Weibull distribution is a probability distribution that statistically describes the strength of an object, the deterioration phenomenon over time, and the lifetime, and is also called the weakest point distribution.
  • the force (stress applied) when a chain is pulled It is used as a model that shows the relationship with the frequency of the parts that are cut (probability of occurrence).
  • the scintillation is a phenomenon in which a crackling sound is generated along with discharge at the weakest part of the surface of the insulator 1 when a voltage is applied to the insulator 1, and therefore it is expected to follow the Weibull distribution which is the weakest point distribution. Is done.
  • FIG. 5 is a flowchart showing a procedure for detecting scintillation that is a precursor phenomenon of tracking deterioration.
  • an electric power company inspector applies a voltage to the insulator 1 and applies the voltage based on the measured values including the acoustic signals of the microphones M1 and M2, the voltage of the VT3, and the current of the CT4. Whether or not scintillation has occurred is determined, and in particular, data processing is simplified and the determination accuracy is improved by a flow that prioritizes processing of acoustic signals generated by each insulator.
  • the determination by the person in charge of inspection may be performed with reference to a screen displaying each measurement value data in real time, or may be performed with reference to a printed matter of each measurement value data after the fact.
  • the person in charge of the inspection refers to the change in the measured values of the microphones M1 and M2, and determines whether or not the acoustic signal has increased rapidly (S501). Specifically, as shown in FIGS. 3B and 3C, the time is divided into blocks having a predetermined width (for example, 1 msec), and the maximum value and the minimum value of the acoustic signal are specified for each block. It is determined whether the difference between the maximum value and the minimum value (vibration width) exceeds a threshold value. Note that the processing for generating the edit data in FIG. 3C from the measurement data in FIG. 3B may be performed by a computer. If the acoustic signal has not increased rapidly (NO in S501), the monitoring in S501 is continued.
  • a predetermined width for example, 1 msec
  • the person in charge of the inspection determines whether there is a time correlation between the two acoustic signals that have rapidly increased (S502). Specifically, as shown in FIG. 1, since the microphones M1 and M2 are provided at predetermined intervals, the delay of the sound wave time calculated by dividing the length (distance) of the intervals by the speed of sound is taken into consideration. Then, the correlation coefficient is calculated, and if the correlation coefficient is equal to or greater than a predetermined threshold (for example, 0.8), it is estimated that the scintillation signal generated in the insulator 1 is present because there is a positive correlation. If there is no time correlation between the acoustic signals (NO in S502), the acoustic signal monitoring in S501 is continued.
  • a predetermined threshold for example, 0.8
  • the person inspecting estimates the generation time of the scintillation signal from the acoustic signal of the microphone M1 (S503). Specifically, as shown in FIG. 1, since there is a predetermined distance between the insulator 1 and the microphone M1, the generation time of the scintillation signal in the insulator 1 and the sound in the microphone M1 are equal to the distance that the sound wave travels the distance. The signal peak measurement time is shifted. Therefore, if the time is traced back from the measurement time of the acoustic signal peak, the generation time of the scintillation signal is reached.
  • the generation time of the scintillation signal may be estimated using the acoustic signal of the microphone M2 and the distance between the microphone M2 and the insulator 1 instead of the microphone M1.
  • the person in charge of inspection determines whether or not the phase of the voltage applied to the insulator 1 is around 90 degrees or 270 degrees at the time estimated in S503 (S504). Specifically, as shown in FIG. 2A, the voltage of insulator 1 has a positive peak value when the phase is 90 degrees and a negative peak value when the phase is 270 degrees. Sometimes scintillation tends to occur. Therefore, with reference to the screen of the display device that displays the temporal change in the measured value of VT3, it is confirmed whether or not the estimated time of occurrence of scintillation is the timing at which the voltage reaches the peak value among the measured values of VT3.
  • the inspector calculates the peak intensity of the high frequency component of about 5 kHz or more of the ground line current measured by CT4 at the estimated time (S505), and the distribution of the peak intensity is a scintillation signal. It is judged whether it is appropriate as (S506).
  • the peak intensity of the high frequency component of the ground line current so far is accumulated in the storage device, and the accumulated peak intensity and the calculated peak intensity Display the distributions and check if they are on the Weibull distribution.
  • the person in charge of the inspection estimates that scintillation has occurred in insulator 1 (S507). This makes it possible to reconfirm that the scintillation generation estimation based on the acoustic signal is correct.
  • the person in charge of the inspection performs scintillation. It is estimated that the acoustic signal indicating the signal was noise (S508). And it returns to the acoustic signal monitoring of S501.
  • the switchgear is configured such that a plurality of banks are arranged in parallel, and a insulator 1 is provided in each bank. Therefore, when the determination procedure of FIG. 5 is actually applied to the switchgear, the shutters of the banks are first opened, and the microphones M1 and M2 are sequentially installed so that the sound waves can be directly received from the respective insulators 1. , S501 and S502 are determined for the acoustic signal to identify the scintillation occurrence 1 that is estimated to generate scintillation. If scintillation occurs in insulator 1, the peak of the acoustic signal can be detected by installing microphones M ⁇ b> 1 and M ⁇ b> 2 for several minutes.
  • the check is performed in order for each bank (insulator 1). Then, the voltage of the specified insulator 1 is measured by VT3 (measurement device for each insulator 1), the ground line current of the insulator 1 is measured by CT4 (a common measurement device for switchgear), and these measured values are measured. Check the occurrence of scintillation based on
  • the microphones M1 and M2 may be installed for each bank (insulator 1).
  • the insulation deterioration on the surface of the insulator 1 can be detected at an early stage.
  • the sound wave generated from the insulator 1 is measured, and based on the vibration width of the sound wave, whether or not scintillation that is a precursor of deterioration has occurred in the insulator 1 is determined. Therefore, tracking deterioration of insulator 1 can be detected at an early stage. In addition, since sound waves are used, even in an environment where electrical noise is high, detection can be performed with high sensitivity and high reliability. Further, as shown in FIG. 3C, the temporal change of the acoustic signal is divided into time blocks, and the peak value for each time block is obtained and compared with a threshold value that is a criterion for scintillation occurrence. Processing can be simplified.
  • the sound waves are measured by the two microphones M1 and M2, and whether there is a time correlation corresponding to the distance between the timings at which the two sound waves thus measured become peaks. Accordingly, since it is estimated whether scintillation has occurred in the insulator 1, the insulator 1 that has begun to deteriorate can be identified.
  • the scintillation estimation method using the insulator 1 as an inspection object has been described.
  • the present scintillation estimation method may be applied to other insulators.
  • an electric wire or a transformer coated with an insulator may be the inspection target.
  • the sound wave of insulator 1 is measured using two microphones M1 and M2.
  • the sound wave generated from insulator 1 when a voltage is applied using a single microphone It is possible to estimate that scintillation has occurred when the vibration width of the sound wave is equal to or greater than a predetermined value. According to this, the deterioration of the insulator 1 can be detected at an early stage using a simple device configuration.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Testing Relating To Insulation (AREA)
PCT/JP2012/060877 2012-04-23 2012-04-23 Procédé d'estimation de scintillation Ceased WO2013160991A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014512049A JP5719970B2 (ja) 2012-04-23 2012-04-23 シンチレーション推定方法
PCT/JP2012/060877 WO2013160991A1 (fr) 2012-04-23 2012-04-23 Procédé d'estimation de scintillation

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104165932A (zh) * 2014-08-22 2014-11-26 国家电网公司 750kV支柱瓷绝缘子振动声学检测试验辅助装置的通用支撑底座及试验方法
CN106052997A (zh) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 特高压直流双柱耦联复合支柱绝缘子抗震试验装置及其试验方法
CN106197920A (zh) * 2016-07-12 2016-12-07 南方电网科学研究院有限责任公司 特高压直流双柱耦联复合支柱绝缘子抗震试验模型及其质量模拟方法
EP3203249A4 (fr) * 2014-09-29 2018-05-30 Mitsubishi Electric Corporation Dispositif de surveillance de détérioration d'isolation

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CN113571269B (zh) * 2021-08-11 2022-09-27 国网陕西省电力公司电力科学研究院 用于恒定电痕化电压法试验的复合绝缘子伞裙试样及其制样方法

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104165932A (zh) * 2014-08-22 2014-11-26 国家电网公司 750kV支柱瓷绝缘子振动声学检测试验辅助装置的通用支撑底座及试验方法
EP3203249A4 (fr) * 2014-09-29 2018-05-30 Mitsubishi Electric Corporation Dispositif de surveillance de détérioration d'isolation
US10161987B2 (en) 2014-09-29 2018-12-25 Mitsubishi Electric Corporation Insulation degradation monitoring device
CN106052997A (zh) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 特高压直流双柱耦联复合支柱绝缘子抗震试验装置及其试验方法
CN106197920A (zh) * 2016-07-12 2016-12-07 南方电网科学研究院有限责任公司 特高压直流双柱耦联复合支柱绝缘子抗震试验模型及其质量模拟方法

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