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WO2011021887A2 - Procédé pour détecter un courant de fuite résistif d'élément d'arrêt d'élément non linéaire à l'aide d'un procédé différentiel et appareil pour celui-ci - Google Patents

Procédé pour détecter un courant de fuite résistif d'élément d'arrêt d'élément non linéaire à l'aide d'un procédé différentiel et appareil pour celui-ci Download PDF

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Publication number
WO2011021887A2
WO2011021887A2 PCT/KR2010/005536 KR2010005536W WO2011021887A2 WO 2011021887 A2 WO2011021887 A2 WO 2011021887A2 KR 2010005536 W KR2010005536 W KR 2010005536W WO 2011021887 A2 WO2011021887 A2 WO 2011021887A2
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WO
WIPO (PCT)
Prior art keywords
leakage current
arrester
detecting
capacitance
resistive
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/KR2010/005536
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English (en)
Korean (ko)
Other versions
WO2011021887A3 (fr
Inventor
주문노
이재복
장석훈
박동욱
명성호
조연규
이병윤
김영진
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.)
Korea Electrotechnology Research Institute KERI
Original Assignee
Korea Electrotechnology Research Institute KERI
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Publication of WO2011021887A2 publication Critical patent/WO2011021887A2/fr
Publication of WO2011021887A3 publication Critical patent/WO2011021887A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/08—Overvoltage arresters using spark gaps structurally associated with protected apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device

Definitions

  • the present invention relates to the detection of resistive leakage current, and more particularly, to calculate the capacitive leakage current of an arrester by using the operating voltage and the total leakage current of a nonlinear element lightning arrester such as zinc oxide (ZnO: Metal Oxide Varistor).
  • the present invention relates to a method for detecting resistive leakage current of a non-linear element lightning arrester capable of accurately detecting only a resistive leakage current component and improving reliability of resistive leakage current detection, which is a measure of the degradation diagnosis of the arrester.
  • Lightning arresters which mainly use non-linear devices, are one of the important power devices that protect electrical transmission lines and transformers by absorbing electrical energy such as brain surges, switching surges, and transient overvoltages.
  • zinc oxide (ZnO) lightning arresters have excellent surge protection characteristics and are currently being applied to power systems rapidly, resulting in elimination of series gaps due to their excellent nonlinear resistance characteristics.
  • the structure is more compact, the manufacturing convenience and the response time to the transient voltage is very fast, there is no transient phenomenon, there is an advantage that almost no upstream flow.
  • micro leakage current flows because it is exposed to dedicated power supply as well as stress caused by brain surge and switching surge.
  • the arrester's deterioration diagnostic technology generally measures the arrester's operating temperature, the three harmonic frequency spectrum of the total leakage current, and the phase difference between the power supply voltage and the total leakage current.However, the method of diagnosing deterioration by measuring the total leakage current. The deterioration diagnosis of the lightning arrester in operation is widely used because of the easy measurement.
  • the constant micro-leakage current (total leakage current) flowing through the arrester is represented by the combination of the capacitive leakage current and the resistive leakage current.
  • the deterioration of the arrester mainly increases the resistive leakage current but hardly changes the capacitive leakage current. Due to long use, natural or artificial deterioration causes the resistive leakage current of the arrester element to increase, resulting in an increase in the amount of heat generated, and eventually thermally destroyed, thereby failing to sufficiently serve as a protective device and causing an accident.
  • resistive leakage current is an important measure for degradation diagnosis.
  • the simple method of diagnosing the arrester based on the leakage current is based on the effective value and maximum value of the leakage current and the maximum value of the third harmonic leakage current component instead of the increase in the resistive leakage current due to the deterioration progression. It does not provide enough information for diagnosis of degradation, including measurement methods and errors due to the installation environment. And direct measurement of resistive leakage current provides better quality information for degradation diagnosis, but it is difficult to measure resistive leakage current directly on site. In addition, if the power source includes harmonics, pulses, and noise, the existing degradation diagnosis method may cause a lot of errors.
  • An object according to an embodiment of the present invention which was devised to solve the above problems, measures the total leakage current and the operating voltage of an arrester which is a nonlinear element, and calculates the capacitive leakage current of the arrester and thereby deteriorates the arrester.
  • the method and apparatus for detecting a resistive leakage current of a nonlinear element lightning arrester using a differential method that can improve the measurement accuracy of the arrester's resistive leakage current by detecting a resistive leakage current, which is a measure, can be improved. To provide.
  • Another object according to an embodiment of the present invention by detecting the resistance leakage current by measuring only the operating voltage and the total leakage current of the arrester, it is possible to reliably determine the degree of degradation of the arrester connected to the live power line, A method for detecting resistive leakage current of a non-linear element lightning arrester using a differential method that can prevent the problem caused by the deterioration of the arrester because the degree of deterioration can be quickly determined. To provide.
  • a method for detecting a resistive leakage current of an arrester is a method for detecting a resistive leakage current of a nonlinear element arrester, and calculates a differential voltage obtained by differentiating an operating voltage input to the arrester in time. Doing; Detecting a capacitance of the arrester based on the total leakage current flowing through the arrester and the differential voltage; Calculating a capacitive leakage current of the arrester using the capacitance; And detecting a resistive leakage current of the arrester through the difference between the total leakage current and the capacitive leakage current.
  • the detecting of the capacitance comprises: calculating values obtained by dividing the total leakage current by the differential voltage; Extracting values of a predetermined time range from the time when the operation voltage is zero among the values; And detecting the capacitance by statistically processing the extracted values of the preset time range in a preset manner.
  • the detecting of the capacitance may calculate an intermediate value of the values of the predetermined time range, and detect the capacitance using the calculated intermediate value.
  • an apparatus for detecting a resistive leakage current of an lightning arrester includes: a device for detecting a resistive leakage current of a nonlinear device, including: a first calculator configured to calculate a differential voltage obtained by differentiating an operating voltage input to the arrester with time; A first detector configured to detect a capacitance of the arrester based on the total leakage current flowing through the arrester and the differential voltage; A second calculator configured to calculate a capacitive leakage current of the arrester using the capacitance; And a second detector configured to detect a resistive leakage current of the arrester based on a difference between the total leakage current and the capacitive leakage current.
  • the first detector may include a third calculator configured to calculate values obtained by dividing the total leakage current by the differential voltage; And extracting values of a predetermined time range at a time when the operation voltage is zero among the values, calculating an intermediate value of the extracted values of the predetermined time range, and using the calculated intermediate values. It may include a third detector for detecting the capacitance.
  • the apparatus may further include a measuring unit measuring the operating voltage and the total leakage current.
  • FIG. 1 illustrates a configuration of an apparatus for detecting a resistive leakage current of a nonlinear device arrester according to an exemplary embodiment of the present invention.
  • FIG. 2 illustrates a configuration of an embodiment of the first detector illustrated in FIG. 1.
  • FIG. 3 is a flowchart illustrating a method for detecting a resistive leakage current of a nonlinear device arrester according to an exemplary embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating an embodiment of operation S330 of FIG. 3.
  • Figure 5 shows an example of a waveform measuring the operating voltage input to the arrester.
  • Figure 6 shows an example of the waveform measured the total leakage current flowing through the arrester.
  • FIG. 1 illustrates a configuration of an apparatus for detecting a resistive leakage current of a nonlinear device arrester according to an exemplary embodiment of the present invention.
  • a resistive leakage current detecting apparatus of a nonlinear device lightning arrester includes a measuring unit 130, a first calculating unit 140, a first detecting unit 150, a second calculating unit 160, and a second detecting unit 170. ).
  • the measuring unit 130 measures the operating voltage Vx applied to the arrester 110, which is a nonlinear device for surge protection, and the total leakage current Ix flowing through the arrester 110.
  • the measurement unit 130 may measure the operating voltage (Vx) applied to the both ends of the arrester 110 through a transformer (not shown) or a voltage divider (not shown), the total leakage current (Ix) Can be measured using a current transformer 120.
  • the driving voltage measured through the measuring unit 130 may be measured to have the same magnitude as that of the voltage flowing through the line bus, but the attenuated voltage may be measured with a predetermined attenuation ratio.
  • the arrester is composed of a combination of the nonlinear resistance R and the capacitance C, and the total leakage current Ix is the nonlinear resistance R. It can be seen that it is the sum of the resistive leakage current I R flowing through and the capacitive leakage current I c flowing through the capacitance C.
  • Resistive leakage current detection device of a non-linear element lightning arrester is calculated using the total leakage current (Ix) and the operating voltage (Vx) measured by the measuring unit 130 of the total leakage current flowing through the arrester Through the process, to calculate the capacitive leakage current having a constant value regardless of the deterioration of the arrester, and to detect the resistive leakage current that can determine the degree of deterioration of the arrester, and to measure only the total leakage current and operating voltage In this case, the resistive leakage current of the arrester can be detected regardless of the place.
  • the arrester may be a nonlinear device including a zinc oxide (ZnO) device.
  • ZnO zinc oxide
  • the total leakage current and the operating voltage measured by the measuring unit 130 may store all the values in real time, but in consideration of the memory space provided in the device may store the sampled value at regular intervals, sampling period May vary depending on the situation.
  • the first calculator 140 receives the measured operating voltage Vx and calculates the derivative voltage dVx / dt differentiated by time.
  • the first calculator 140 calculates the differential voltage to detect the capacitance constituting the arrester.
  • the first detection unit 150 uses the differential voltage dVx / dt calculated by the first calculation unit 140 and the total leakage current Ix measured by the measurement unit 130. ), The capacitance can be detected using the values calculated by dividing the total leakage current by the differential voltage.
  • the first detector 150 may use various methods for detecting the capacitance from the calculated values.
  • the first detector 150 may use a median function that detects an intermediate value.
  • This first detection unit will be described with reference to FIG. 2.
  • FIG. 2 illustrates a configuration of an embodiment of the first detector illustrated in FIG. 1.
  • the first detector 150 includes a third calculator 210 and a third detector 220.
  • the third calculator 210 calculates k (t), which is a value obtained by dividing the total leakage current Ix by the differential voltage calculated by the first calculator 140.
  • the third calculator 210 calculates values for detecting capacitance using Ix / (dVx / dt) obtained by dividing the total leakage current by the differential voltage.
  • the third detector 220 detects a capacitance constituting the arrester by using the k (t) values calculated by the third calculator 210, wherein a value corresponding to the capacitance is calculated values. It can be obtained by extracting the values at the time when the magnitude of the heavy operation voltage Vx is 0 and statistically processing the extracted values by using the median function.
  • the time in the vicinity of the magnitude of the operating voltage (Vx) is 0 may vary depending on the waveform of the measured operating voltage, for example, frequency, this time range may be determined through simulation, measurement, etc. This may be determined by the vendor or developer providing the device of the present invention.
  • the resistive leakage current I R is also zero at the time when the operating voltage Vx is zero. Becomes Therefore, the total leakage current Ix at the time when the operating voltage is 0 becomes the capacitive leakage current Ic, and the value of k (t) at the time when the magnitude of the operating voltage Vx is 0 is changed to the capacitance ( Capacitance can be considered. However, since the value of k (t) at the time when the magnitude of the operating voltage Vx is 0 may not be obtained depending on the sampling time and hardware characteristics of the measuring device, the third detection unit 220 may operate.
  • the process of detecting the capacitance according to the operating voltage measured by the measuring unit 130 may be different from that of the third detecting unit 220.
  • the third detecting unit 220 may be applied to the actual voltage applied to the bus line by the measuring unit 130.
  • the third detector 220 may detect a value KA obtained by multiplying the intermediate value by the damping ratio as the capacitance of the arrester, and the bus may be measured by the measuring unit 130.
  • the third detector 220 may detect the intermediate value K as a capacitance.
  • the second calculator 160 calculates the detected capacitance and the differential voltage calculated by the first calculator 140. To calculate the capacitive leakage current (Ic) of the arrester.
  • the second calculation unit 160 when the intermediate value K for detecting the capacitance is detected by the first detection unit, the second calculation unit 160 has an intermediate value even when the measured operating voltage Vx is different from the voltage applied to the actual bus line.
  • the product of the value and the differential voltage can be used to calculate the capacitive leakage current.
  • the intermediate value K becomes the capacitance C to calculate the capacitive leakage current, and if the magnitude of the operating voltage Vx is measured, the damping ratio A
  • the capacitive leakage current Ic of the arrester can be calculated accurately regardless of the damping ratio measuring the operating voltage (Vx).
  • the resistive leakage current detecting apparatus of the nonlinear element lightning arrester measures the operating voltage and the total leakage current of the arrester, and accurately detects the capacitance constituting the arrester by using the measured value. Capacitive leakage current can be accurately measured, and through this, the resistive leakage current can be detected to minimize the error of the resistive leakage current, and therefore, deterioration of the arrester can be reliably determined.
  • the present invention includes a measuring means capable of measuring the total leakage current and the operating voltage, and can be manufactured in a small size because the measured value can be performed in software, thereby making it easy to carry and resistive at a desired place.
  • the leakage current and the degree of deterioration of the arrester using the same can be easily determined.
  • FIG. 3 is a flowchart illustrating a method for detecting a resistive leakage current of a nonlinear device lightning arrester according to an exemplary embodiment of the present invention. A method of detecting a resistive leakage current will be described with reference to FIGS. 5 to 10.
  • the operating voltage of the arrester and the total leakage current flowing through the arrester are measured (S310).
  • the measured operating voltage may be the same as the voltage applied to the line bus to which the arrester is connected, but the attenuated voltage may be measured by a predetermined damping ratio.
  • FIG. 5 shows an example of a waveform measuring the operating voltage input to the arrester
  • Figure 6 shows an example of a waveform measuring the total leakage current flowing through the arrester
  • the operating voltage (Vx) is a transformer Or it can be measured through a voltage divider, etc.
  • the total leakage current (Ix) can be measured through a current transformer.
  • differential voltage dVx / dt is calculated as shown in FIG. 7 by differentiating the measured operating voltage Vx with time (S320). .
  • the capacitance of the arrester is detected using the total leakage current Ix and the differential voltage dVx / dt measured and calculated in steps S310 and S320 (S330).
  • k (t) Ix / (dVx / dt) values are calculated using the total leakage current Ix and the differential voltage dVx / dt, and the capacitance of the arrester can be detected from the calculated values. This will be described with reference to FIG. 4.
  • FIG. 4 is a flowchart illustrating an embodiment of operation S330 of FIG. 3.
  • k (t) values calculated by step S410 k (t) values of a preset time range in which the operating voltage Vx is 0 (zero) are extracted, and the intermediate values of the extracted k (t) values are extracted.
  • a function that can be calculated for example, a median function
  • an intermediate value 810 K corresponding to the capacitance of the arrester is calculated (S420 and S430).
  • the capacity of the arrester is detected by using the calculated median value.
  • the capacity of the arrester may be the calculated median value.
  • the capacity of the arrester detected may be a value obtained by multiplying the intermediate value by the damping ratio (S440).
  • the capacitive leakage current Ic is calculated as shown in FIG. 9 by multiplying the detected capacitance by the differential voltage.
  • the capacitive leakage current Ic When the capacitive leakage current Ic is calculated, the degree of deterioration of the arrester is determined as shown in FIG. 10 through the difference Ix-Ic between the total leakage current Ix and the capacitive leakage current Ic.
  • the resistive leakage current I R can be detected (S350).
  • the measured operating voltage and the total leakage current of the arrester may be measured values in real time, and the measured and stored values. May be
  • the resistive leakage current detecting method of the nonlinear device lightning arrester measures the operating voltage and the total leakage current of the arrester, detects the capacitance of the arrester using the measured values, and detects the arrester.
  • the capacitive leakage current whose value does not change regardless of the deterioration of the arrester through the capacitance of, it is possible to accurately detect the resistive leakage current which is a measure of the degradation diagnosis of the arrester.
  • harmonic components are included in the operating voltage, pulses and noise are included to solve the problem that may occur in measuring the degradation diagnosis of the arrester, and the accuracy thereof is improved. Reliability can be increased by minimizing the error of the detected resistive leakage current, and thus, the degree of deterioration of the arrester can be accurately determined.
  • the resistive leakage current detecting method and apparatus thereof of the non-linear element lightning arrester according to the present invention can be modified and applied in various forms within the scope of the technical idea of the present invention and are not limited to the above embodiments.
  • the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, not intended to limit the scope of the technical idea of the invention, the present invention described above is common knowledge in the technical field to which the present invention belongs
  • those skilled in the art can have various substitutions, modifications, and changes without departing from the spirit of the present invention, it is not limited to the embodiments and the accompanying drawings. And should be judged to include equality.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

L'invention porte sur un procédé de détection d'un courant de fuite résistif d'un élément d'arrêt d'élément non linéaire à l'aide d'un procédé différentiel et sur un appareil pour celui-ci. Le procédé pour détecter le courant de fuite résistif de l'élément d'arrêt d'élément non linéaire selon un mode de réalisation de la présente invention peut consister à : calculer une tension différentielle par différenciation d'une tension fonctionnelle entrée dans l'élément d'arrêt en fonction du temps ; détecter une capacité de l'élément d'arrêt en fonction d'un courant de fuite total appliqué à travers l'élément d'arrêt et de la tension différentielle ; calculer un courant de fuite capacitif de l'élément d'arrêt à l'aide de la capacité ; et détecter le courant de fuite résistif de l'élément d'arrêt à l'aide de la différence entre le courant de fuite total et le courant de fuite capacitif.
PCT/KR2010/005536 2009-08-20 2010-08-20 Procédé pour détecter un courant de fuite résistif d'élément d'arrêt d'élément non linéaire à l'aide d'un procédé différentiel et appareil pour celui-ci Ceased WO2011021887A2 (fr)

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KR10-2009-0076992 2009-08-20
KR1020090076992A KR101086878B1 (ko) 2009-08-20 2009-08-20 미분법을 이용한 비선형 소자 피뢰기의 저항성 누설전류 검출 방법 및 그 장치

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CN103207308A (zh) * 2013-03-13 2013-07-17 福建省电力有限公司 避雷器阻性电流和容性电流暂态值的测量方法
CN103605040A (zh) * 2013-11-04 2014-02-26 国家电网公司 Gis设备内置避雷器交流泄漏电流测试方法
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CN102721871A (zh) * 2012-06-08 2012-10-10 上海市电力公司 一种测量氧化锌避雷器的电压和全电流的相位差的方法
CN103207308A (zh) * 2013-03-13 2013-07-17 福建省电力有限公司 避雷器阻性电流和容性电流暂态值的测量方法
CN103605040A (zh) * 2013-11-04 2014-02-26 国家电网公司 Gis设备内置避雷器交流泄漏电流测试方法
CN104316747A (zh) * 2014-10-31 2015-01-28 南京世都科技有限公司 一种基于gps同步秒脉冲的避雷器阻性电流监测方法及装置
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CN108828292B (zh) * 2018-06-06 2020-10-13 国家电网公司华中分部 考虑接地排影响的氧化锌避雷器阻性电流在线监测方法
CN112305352A (zh) * 2020-10-20 2021-02-02 云南电网有限责任公司电力科学研究院 一种基于同相电容型设备的电压重构moa阻性电流测试方法
CN112305351A (zh) * 2020-10-20 2021-02-02 云南电网有限责任公司电力科学研究院 一种泄漏电流重构电压的moa阻性电流测量方法
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CN112578309A (zh) * 2020-10-29 2021-03-30 深圳供电局有限公司 避雷器带电测试的电压参考信号的获取方法及获取装置
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CN113420399B (zh) * 2021-06-30 2022-09-09 国网河南省电力公司电力科学研究院 绝缘接头雷电感应电压计算方法、装置、设备及介质
CN115166337A (zh) * 2022-07-19 2022-10-11 广东电网有限责任公司 避雷器阻性电流计算方法及装置、电子设备
CN121164705A (zh) * 2025-11-19 2025-12-19 国网湖北送变电工程有限公司 一种基于自适应噪声抵消的避雷器阻性电流检测方法

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