KR100632078B1 - Noise discriminating device and method for detect the partial discharge in underground power cable - Google Patents

Noise discriminating device and method for detect the partial discharge in underground power cable Download PDF

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KR100632078B1
KR100632078B1 KR1020050049938A KR20050049938A KR100632078B1 KR 100632078 B1 KR100632078 B1 KR 100632078B1 KR 1020050049938 A KR1020050049938 A KR 1020050049938A KR 20050049938 A KR20050049938 A KR 20050049938A KR 100632078 B1 KR100632078 B1 KR 100632078B1
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noise
partial discharge
high frequency
metal foil
sensor
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Korean (ko)
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이전선
김충식
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엘에스전선 주식회사
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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
    • G01R31/1227—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
    • G01R31/1263—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
    • G01R33/0029—Treating the measured signals, e.g. removing offset or noise

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  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

A method and an apparatus for removing a noise in measuring partial discharge of a super high-voltage cable are provided to enhance measurement accuracy of a discharge pattern by accurately discriminating the noise from the discharge pattern. An apparatus for removing a noise in measuring partial discharge of a super high-voltage cable includes at least one pair of first metal film sensors(3), a detector(5), a noise gate(6), and a partial discharge pattern analyzer(7). The first metal film sensors are formed at both sides of a power cable connecting box about an insulation barrel of the power cable connecting box. The detector is connected to the first metal film sensors and detects a partial discharge signal, which is generated inside the connecting box. The noise gate is connected to the detector. The partial discharge pattern analyzer is connected to the noise gate. A second metal film sensor(8), to which a ground cable is connected, is installed around a cable adjacent to the connecting box. A high frequency current sensor(9) is installed around the ground cable. A pulse shape analyzer(10) is connected between the high frequency current sensor and an input terminal of the noise gate.

Description

초고압 케이블의 부분방전 측정 시 노이즈 제거장치 및 방법{Noise discriminating device and method for detect the partial discharge in underground power cable}Noise discriminating device and method for detect the partial discharge in underground power cable}

도 1은 종래 노이즈 제거장치의 구성도이다.1 is a block diagram of a conventional noise removing device.

도 2는 종래 맨홀에서 측정한 부분방전 패턴 분석도이다.2 is a partial discharge pattern analysis diagram measured in the conventional manhole.

도 3은 본 발명에 따른 노이즈 제거장치의 구성도이다.3 is a block diagram of a noise removing apparatus according to the present invention.

도 4는 본 발명에 따른 고주파 전류센서의 실측 파형도이다.4 is a measured waveform diagram of a high frequency current sensor according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : 케이블 2 : 접속함1 cable 2 connection box

3 : 제1금속박센서 5 : 검출기3: first metal foil sensor 5: detector

6 : 노이즈게이트 7 : 부분방전패턴분석기6: Noise Gate 7: Partial Discharge Pattern Analyzer

8 : 제2금속박센서 9 : 고주파전류센서8 second metal foil sensor 9 high frequency current sensor

10 : 펄스형태분석기 11 : 접지선10: pulse shape analyzer 11: ground wire

본 발명은 초고압 케이블 부분방전 측정 시 노이즈를 제거하기 위한 장치 및 방법에 관한 것으로, 더욱 상세하게는 맨홀이나 전력구 등에서도 케이블을 따라 전파되어 온 노이즈를 정확하게 판별하여 제거할 수 있는 초고압 케이블의 부분방전 측정 시 노이즈 제거장치 및 방법에 관한 것이다.The present invention relates to a device and a method for removing noise in the measurement of ultra-high voltage cable partial discharge, and more particularly, a portion of the ultra-high voltage cable that can accurately determine and remove the noise propagated along the cable even in a manhole or power outlet The present invention relates to a noise removing device and a method for measuring discharge.

일반적으로, 지중 송전 케이블을 연결하는 접속함 내부에서는 절연체 이상에 의해 수십MHz의 부분방전이 발생되는 경우가 많은데, 이러한 부분방전은 전력케이블과 접속함의 열화를 유발하여 선로의 수명을 단축시키거나, 파손의 원인이 되므로, 운전중인 전력케이블의 부분방전 측정은 정확하게 이루어져야 한다.In general, a partial discharge of several tens of MHz is often generated inside the junction box connecting the underground power transmission cable due to an insulator abnormality. Such a partial discharge causes deterioration of the power cable and the junction box and shortens the life of the line. Partial discharge measurements of live power cables must be made accurately, as this can cause damage.

이를 위해 종래에는 케이블 접속함의 둘레에 한 쌍의 금속박센서를 부착하여 이를 통해 부분방전 신호를 측정하였다. 그러나, 이러한 측정방법은 고압부의 코로나 방전신호 등의 노이즈가 케이블을 따라 전파되어서 부분방전신호와 함께 금속박센서를 통해 검출되므로, 측정감도 저하 및 PD패턴을 정확하게 파악하기 어렵게 되는 문제점이 있다.To this end, conventionally, a pair of metal foil sensors were attached to the periphery of the cable connection box to measure the partial discharge signal. However, this measurement method has a problem in that noise such as a corona discharge signal of the high voltage portion is propagated along the cable and detected together with the partial discharge signal through the metal foil sensor, thereby making it difficult to accurately grasp the measurement sensitivity and the PD pattern.

한편, 이러한 노이즈를 제거하기 위한 종래의 방법으로는 도 1에서와 같이, 노이즈를 측정하기 위한 안테나센서(4)를 금속박센서(3)와 함께 설치하여 노이즈게이트(6)에 접속하므로써, 금속박센서(3)의 신호에서 안테나센서(4)의 노이즈신호를 제거하는 방법을 이용하였다.On the other hand, in the conventional method for removing such noise, as shown in Figure 1, by installing the antenna sensor 4 for measuring the noise with the metal foil sensor 3 and connected to the noise gate 6, the metal foil sensor The noise signal of the antenna sensor 4 was removed from the signal of (3).

그러나, 이러한 노이즈 제거방법은 안테나센서(4)를 통해 감지하는 노이즈신호가 공기를 통해 전파되는 전자파의 형태의 신호로서, 안테나센서(4)의 설치위치 및 측정감도에 따라 많은 영향을 받는다는 문제점 이외에도, 옥외변전소 등에서는 안테나센서(4)가 사용가능 하지만 전력구이거나 맨홀의 경우에는 노이즈가 공중파로 유입되는 것이 아니라 케이블을 타고 전파되어 유입되기 때문에, 안테나센서(4)의 사용이 불가능하다는 문제점이 있다. However, the noise removing method is a signal in the form of electromagnetic waves propagated through the air, the noise signal detected through the antenna sensor 4, in addition to the problem that is affected a lot depending on the installation position and the measurement sensitivity of the antenna sensor (4). In the outdoor substation, the antenna sensor 4 can be used, but in the case of an electric power source or a manhole, the noise is not introduced into the airwaves but propagated through the cable, so that the use of the antenna sensor 4 is impossible. have.

그 외, 전력구나 맨홀에서 노이즈를 제거하기 위한 종래의 방법으로는 스팩트럼 분석을 통한 주파수 튜닝방법을 이용하기도 하지만 펄스성 노이즈가 유입되는 경우 노이즈신호가 부분방전신호와 거의 같은 주파수 스펙트럼을 나타내므로 제거가 쉽지 않고, 주파수 대역을 잘못 선택하는 경우 부분방전 신호조차 검출하지 못하는 등의 문제점이 있다.In addition, the conventional method for removing noise from power or manholes is a frequency tuning method through spectrum analysis. However, when pulsed noise is introduced, the noise signal exhibits almost the same frequency spectrum as the partial discharge signal. Is not easy, and if the frequency band is incorrectly selected, there is a problem such as not even detecting the partial discharge signal.

본 발명은 상기의 문제점을 해결하기 위해 창작된 것으로서, 안테나 사용이 불가능한 맨홀이나 전력구 등에서도 케이블을 따라 유입되는 노이즈를 정확히 판별하여 부분방전 패턴 분선의 신뢰성을 현저히 높일 수 있도록 한 초고압 케이블의 부분방전 측정 시 노이즈 제거장치 및 방법을 제공하는데 그 목적이 있다.The present invention was created to solve the above problems, and the part of the ultra-high voltage cable to accurately determine the noise flowing along the cable even in the manhole or power port, which is impossible to use the antenna, to significantly increase the reliability of the partial discharge pattern segmentation. It is an object of the present invention to provide an apparatus and a method for removing noise in discharge measurement.

상기와 같은 목적을 실현하기 위한 장치로서의 본 발명은, 전력케이블용 접 속함의 절연통을 중심으로 양단부 둘레의 적어도 한 쌍의 제1금속박센서와, 제1금속박센서에 연결되어 접속함 내부에서 발생되는 부분방전 신호를 검출하는 검출기와, 이 검출기에 연결된 노이즈게이트와, 노이즈게이트에 연결된 부분방전패턴분석기를 포함하여 구성된 부분방전 측정장치에 있어서, 상기 접속함과 인접된 케이블의 둘레에 설치되며 접지선이 연결된 제2금속박센서와, 상기 접지선 둘레에 설치된 고주파전류센서와, 이 고주파전류센서와 상기 노이즈게이트의 입력단 사이에 접속되는 펄스형태분석기를 포함하여 구성된 것을 특징으로 한다.The present invention as an apparatus for realizing the above object is generated inside the junction box connected to at least one pair of the first metal foil sensor around the both ends and the first metal foil sensor around the insulating tube of the power cable junction box. A partial discharge measuring device comprising a detector for detecting a partial discharge signal, a noise gate connected to the detector, and a partial discharge pattern analyzer connected to the noise gate, the partial discharge measuring device comprising: a ground wire disposed around a cable adjacent to the junction box; And a pulse shape analyzer connected between the connected second metal foil sensor, a high frequency current sensor provided around the ground line, and an input terminal of the high frequency current sensor and the noise gate.

상기 제2금속박센서와 고주파전류센서 및 펄스형태분석기는 접속함 양측 케이블에 각각 설치된 것을 특징으로 한다.The second metal foil sensor, the high frequency current sensor, and the pulse shape analyzer are installed in the cable on both sides of the junction box.

상기와 같은 목적을 실현하기 위한 방법으로서의 본 발명은, 접속함의 절연통을 중심으로 양단부 둘레에 접속되는 적어도 한 쌍의 제1금속박센서와, 제1금속박센서에 연결된 검출기와, 이 검출기에 연결된 노이즈게이트와, 노이즈게이트에 연결된 부분방전패턴분석기와, 상기 접속함과 인접된 케이블의 둘레에 설치되며 접지선이 연결된 제2금속박센서와, 상기 접지선 둘레에 설치된 고주파전류센서와, 이 고주파전류센서와 상기 노이즈게이트의 입력단 사이에 접속되는 펄스형태분석기로 구성된 측정장치를 이용하여 노이즈를 제거하는 방법에 있어서, 상기 고주파전류센서를 통해 검출된 신호 중 외부의 노이즈 발생부분으로부터 상대적으로 장거리를 전파되어 오면서 고주파성분이 감쇄된 저주파신호를 노이즈게이트의 트리거신호로 사용하여 상기 검출기를 통해 검출된 부분방전신호에서 노이즈를 제거하도록 된 것을 특징으로 한다.The present invention as a method for realizing the above object comprises at least one pair of first metal foil sensors connected around both ends of an insulating tube of a junction box, a detector connected to the first metal foil sensor, and noise connected to the detectors. A partial discharge pattern analyzer connected to a gate, a noise gate, a second metal foil sensor installed around the cable adjacent to the junction box, and connected to a ground wire, a high frequency current sensor installed around the ground wire, and the high frequency current sensor and the A method of removing noise by using a measuring device comprising a pulse shape analyzer connected between input terminals of a noise gate, the method comprising: a high frequency wave propagating a relatively long distance from an external noise generating part of a signal detected by the high frequency current sensor The low frequency signal whose component is attenuated is used as a trigger signal of the noise gate. And in the partial discharge signal detected by the detector, characterized in that so as to remove noise.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명한다. 또한, 본 실시예는 본 발명의 권리범위를 한정하는 것은 아니고, 단지 예시로 제시된 것이며 종래 구성과 동일한 부분은 동일한 부호 및 명칭을 사용한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment does not limit the scope of the present invention, but is presented by way of example only and the same parts as in the conventional configuration using the same reference numerals and names.

도 3은 본 발명에 따른 노이즈 제거장치의 구성도이고, 도 4는 본 발명에 따른 고주파 전류센서의 실측 파형도이다.Figure 3 is a block diagram of a noise removing device according to the present invention, Figure 4 is a measured waveform diagram of a high frequency current sensor according to the present invention.

이를 참조하면, 상기 노이즈 제거장치는 접속함(2)의 절연통을 중심으로 양단부에 접속되는 한 쌍의 제1금속박센서(3)와, 제1금속박센서(3)에 접속된 검출기(5)와, 이 검출기(5)에 접속된 노이즈게이트(6)와, 노이즈게이트(6)에 접속된 부분방전패턴분석기(7)와, 상기 접속함(2)과 인접된 양측 케이블(1)의 둘레에 설치되며 접지선(11)이 연결된 한 쌍의 제2금속박센서(8)와, 상기 접지선(11) 둘레에 설치된 한 쌍의 고주파전류센서(9)와, 각각의 고주파전류센서(9)와 노이즈게이트(6)의 입력단 사이에 접속되는 한 쌍의 펄스형태분석기(10)로 구성된다. 이때, 상기 제1금속박센서(3)와, 검출기(5), 노이즈게이트(6), 부분방전패턴분석기(7) 등은 종래와 동일 유사하다.Referring to this, the noise removing device includes a pair of first metal foil sensors 3 connected to both ends of the insulating tube of the junction box 2 and a detector 5 connected to the first metal foil sensors 3. And a circumference of the noise gate 6 connected to the detector 5, the partial discharge pattern analyzer 7 connected to the noise gate 6, and the two cables 1 adjacent to the junction box 2; A pair of second metal foil sensors 8 installed at the ground wire 11 and connected to the ground wire 11, a pair of high frequency current sensors 9 installed around the ground line 11, and each of the high frequency current sensors 9 and noise. It consists of a pair of pulse shape analyzers 10 connected between input terminals of the gate 6. In this case, the first metal foil sensor 3, the detector 5, the noise gate 6, the partial discharge pattern analyzer 7 and the like are similar to the conventional ones.

상기 제2금속박센서(8)는 접속함(2)과 인접된 양측 케이블(1)의 둘레를 감싸면서 설치되는 것으로, 케이블(1)의 시스를 따라 전달되는 노이즈신호와 접속함(2) 내부의 부분방전신호가 동시에 검출되며, 접지선(11)을 통해 지중에 그라운딩된다. 이러한 제2금속박센서(8)의 특성은 커패시턴스에 의해 결정되며, 500pF 이상의 용량을 갖도록 설계된다.The second metal foil sensor 8 is installed while surrounding the circumferences of both side cables 1 adjacent to the junction box 2, and inside the junction box 2 with the noise signal transmitted along the sheath of the cable 1. The partial discharge signal of is simultaneously detected and grounded to the ground through the ground line 11. The characteristic of this second metal foil sensor 8 is determined by the capacitance and is designed to have a capacity of 500 pF or more.

상기 고주파전류센서(9)는 제2금속박센서(8)에 연결된 접지선(11) 둘레에 설 치되며 접지선(11)을 따라 흐르는 미소전류를 검출하여 펄스형태분석기(10)로 신호 전달한다. 이때 검출되는 신호는 감쇄 진동파의 형태를 나타내며, 진동파의 공진주파수가 수MHz 이상의 고주파 대역을 갖도록 조절된다.The high frequency current sensor 9 is installed around the ground line 11 connected to the second metal foil sensor 8 and detects a small current flowing along the ground line 11 and transmits the signal to the pulse shape analyzer 10. At this time, the detected signal represents the shape of the attenuation vibration wave, and the resonance frequency of the vibration wave is adjusted to have a high frequency band of several MHz or more.

상기 펄스형태분석기(10)는 고주파전류센서(9)와 노이즈게이트(6) 사이에 접속되어, 고주파전류센서(9)에서 검출된 신호를 파형 분석하여 노이즈로 판별된 펄스를 노이즈게이트(6)의 트리거신호로 입력하기 위한 것이다. 이때 접속함(2) 내부에서 발생된 부분방전펄스는 전파거리가 매우 짧아서 고주파 대역의 신호를 그대로 가지고 있지만, 노이즈 신호의 경우에는 케이블(1)을 통해 장거리를 전파되어 오면서 고주파 성분의 신호는 감쇄되고 저주파 성분의 신호가 주를 이루게 되며, 따라서 부분방전신호와는 확연히 구별된다.The pulse shape analyzer 10 is connected between the high frequency current sensor 9 and the noise gate 6 to perform waveform analysis on the signal detected by the high frequency current sensor 9 to determine the noise determined by the noise gate 6. This is for inputting the trigger signal of. At this time, the partial discharge pulse generated inside the junction box 2 has a very high propagation distance and thus retains a high frequency signal. However, in the case of a noise signal, the high frequency component is attenuated while the long distance is propagated through the cable 1 In other words, the signal of low frequency component is dominant, and thus is clearly distinguished from the partial discharge signal.

이상의 구성에 의한 부분방전 측정장치를 이용하여 노이즈를 제거하는 방법에 대해 살펴보면 다음과 같다.Looking at the method for removing noise by using the partial discharge measuring device according to the above configuration as follows.

상기 제2금속박센서(8)와 고주파전류센서(9)를 통해 검출된 신호에는 도 4에서와 같이, 접속함 내부에서 발생된 부분방전신호(13)와, 케이블을 따라 전달되어 온 노이즈신호(14)가 동시에 검출되는데, 바로 인접된 접속함 내부의 부분방전신호(13)의 펄스는 전파거리가 매우 짧아서 고주파 대역의 신호가 그대로 검출되는데 반해, 코로나 방전부분으로부터 케이블을 따라 먼거리를 전파되어 온 노이즈신호(14)는 전파과정에서 고주파 성분의 신호는 감쇄되므로, 저주파의 펄스를 띠게 된다.The signal detected through the second metal foil sensor 8 and the high frequency current sensor 9, as shown in Figure 4, the partial discharge signal 13 generated inside the junction box, and the noise signal transmitted along the cable ( 14) is detected at the same time, while the pulse of the partial discharge signal 13 in the adjacent junction box has a very short propagation distance, so that the signal of the high frequency band is detected as it is, but a long distance has been propagated along the cable from the corona discharge part. Since the noise signal 14 attenuates the signal of the high frequency component in the propagation process, the noise signal 14 has a low frequency pulse.

따라서, 도 3의 고주파전류센서(9)에서 검출된 신호를 파형 분석하여 저주파 성분을 노이즈게이트(6)의 트리거신호로 사용하게 되면, 상기 검출기(5)를 통해 검출된 접속함(2) 내부의 부분방전신호에서 노이즈를 간편하게 제거할 수 있게 된다.Accordingly, when the signal detected by the high frequency current sensor 9 of FIG. 3 is waveform analyzed and the low frequency component is used as a trigger signal of the noise gate 6, the junction box 2 detected through the detector 5 is detected. The noise can be easily removed from the partial discharge signal of.

부분방전 펄스를 모의하기 위해 케이블(1)의 고압도체 부분에 캘리브레이터를 이용하여 펄스성 신호를 주입한 결과, 고주파전류센서(9)에서 검출된 파형은 도 4에서와 같이, 부분방전 신호의 경우 고주파 성분이 존재하는 감쇄진동파의 형태를 나타내어서, 노이즈 신호와는 확연히 구분되었다. As a result of injecting a pulsed signal using a calibrator into the high-voltage conductor portion of the cable 1 to simulate the partial discharge pulse, the waveform detected by the high frequency current sensor 9 is as shown in FIG. The attenuation oscillation wave in which the high frequency component exists is clearly distinguished from the noise signal.

상기와 같은 본 발명은, 안테나에 의해 전자파를 검출하는 것이 아니라, 케이블을 따라 유입되는 노이즈를 케이블 둘레에 장착된 금속박센서에 의해 검출하게 되므로, 지상에서뿐만 아니라 맨홀이나 전력구에서도 노이즈 제거가 가능하게 되었다.As described above, the present invention does not detect electromagnetic waves by the antenna, but detects noise flowing along the cable by a metal foil sensor mounted around the cable, so that noise can be removed not only from the ground but also from a manhole or a power outlet. It became.

또한, 노이즈검출용 센서와 부분방전검출용 센서가 동일한 상의 케이블에 설치되므로, 종래 안테나 사용시 문제점인 설치위치에 따른 특성변화의 문제가 해결될 뿐만 아니라, 파형 분석을 통해 노이즈를 정확히 구분하게 되므로, 부분방전 패턴 분석의 신뢰성을 한층 높일 수 있다. In addition, since the noise detection sensor and the partial discharge detection sensor are installed in the same phase cable, the problem of the characteristic change according to the installation position, which is a problem when using a conventional antenna, is solved, and the noise is accurately distinguished through waveform analysis. The reliability of the partial discharge pattern analysis can be further improved.

Claims (3)

전력케이블용 접속함의 절연통을 중심으로 양단부 둘레의 적어도 한 쌍의 제1금속박센서와, 제1금속박센서에 연결되어 접속함 내부에서 발생되는 부분방전 신호를 검출하는 검출기와, 이 검출기에 연결된 노이즈게이트와, 노이즈게이트에 연결된 부분방전패턴분석기를 포함하여 구성된 부분방전 측정장치에 있어서, 상기 접속함과 인접된 케이블의 둘레에 설치되며 접지선이 연결된 제2금속박센서와, 상기 접지선 둘레에 설치된 고주파전류센서와, 이 고주파전류센서와 상기 노이즈게이트의 입력단 사이에 접속되는 펄스형태분석기를 포함하여 구성된 것을 특징으로 하는 초고압 케이블의 부분방전 측정 시 노이즈 제거장치.At least one pair of first metal foil sensors around both ends of the power box junction box, a detector connected to the first metal foil sensor to detect a partial discharge signal generated inside the junction box, and noise connected to the detector A partial discharge measuring device including a gate and a partial discharge pattern analyzer connected to a noise gate, comprising: a second metal foil sensor installed around a cable adjacent to the junction box and connected to a ground wire, and a high frequency current installed around the ground wire And a pulse shape analyzer connected between the sensor and the high frequency current sensor and the input terminal of the noise gate. 제 1 항에 있어서,The method of claim 1, 상기 제2금속박센서와 고주파전류센서 및 펄스형태분석기는 접속함 양측 케이블에 각각 설치된 것을 특징으로 하는 초고압 케이블의 부분방전 측정 시 노이즈 제거장치.The second metal foil sensor, the high frequency current sensor, and the pulse shape analyzer are installed in the cable of both sides of the junction box, the noise removing device for the partial discharge measurement of the ultra-high voltage cable. 접속함의 절연통을 중심으로 양단부 둘레에 접속되는 적어도 한 쌍의 제1금속박센서와, 제1금속박센서에 연결된 검출기와, 이 검출기에 연결된 노이즈게이트 와, 노이즈게이트에 연결된 부분방전패턴분석기와, 상기 접속함과 인접된 케이블의 둘레에 설치되며 접지선이 연결된 제2금속박센서와, 상기 접지선 둘레에 설치된 고주파전류센서와, 이 고주파전류센서와 상기 노이즈게이트의 입력단 사이에 접속되는 펄스형태분석기로 구성된 측정장치를 이용하여 노이즈를 제거하는 방법에 있어서, At least one pair of first metal foil sensors connected around both ends of the insulating box of the junction box, a detector connected to the first metal foil sensor, a noise gate connected to the detector, a partial discharge pattern analyzer connected to the noise gate, and A measurement consisting of a second metal foil sensor installed around the cable adjacent to the junction box and connected to a ground wire, a high frequency current sensor installed around the ground wire, and a pulse shape analyzer connected between the high frequency current sensor and an input terminal of the noise gate In a method for removing noise using a device, 상기 고주파전류센서를 통해 검출된 신호 중 외부의 노이즈 발생부분으로부터 상대적으로 장거리를 전파되어 오면서 고주파성분이 감쇄된 저주파신호를 노이즈게이트의 트리거신호로 사용하여 상기 검출기를 통해 검출된 부분방전신호에서 노이즈를 제거하도록 된 것을 특징으로 하는 초고압 케이블의 부분방전 측정 시 노이즈 제거방법.Noise in the partial discharge signal detected through the detector using a low frequency signal in which a high frequency component is attenuated while a relatively long distance is propagated from an external noise generating part of the signal detected by the high frequency current sensor as a trigger signal of the noise gate. Noise removal method when measuring the partial discharge of the ultra-high voltage cable, characterized in that to remove.
KR1020050049938A 2005-06-10 2005-06-10 Noise discriminating device and method for detect the partial discharge in underground power cable KR100632078B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103308832A (en) * 2013-05-31 2013-09-18 国家电网公司 Partial discharge test device for high-voltage cable insulation middle joint and use method
CN103869228A (en) * 2014-04-02 2014-06-18 上海华普电缆有限公司 Terminal for partial discharge tests on stress ring-oil seal type crosslinked polyethylene power cable of 35 kV or lower
CN106124950A (en) * 2016-08-30 2016-11-16 合肥智博电气有限公司 High voltage electric transmission cable on-line measuring device
CN107037323A (en) * 2017-04-21 2017-08-11 国网河南省电力公司鹤壁供电公司 High-tension cable fault verification system and method
CN107300661A (en) * 2017-08-24 2017-10-27 国家电网公司 Oil immersed current transformer discharge in insulation pulse detecting equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103308832A (en) * 2013-05-31 2013-09-18 国家电网公司 Partial discharge test device for high-voltage cable insulation middle joint and use method
CN103869228A (en) * 2014-04-02 2014-06-18 上海华普电缆有限公司 Terminal for partial discharge tests on stress ring-oil seal type crosslinked polyethylene power cable of 35 kV or lower
CN103869228B (en) * 2014-04-02 2016-05-11 上海华普电缆有限公司 35kV and following NOL ring-oil sealing type cross-inked polyethylene power cable shelf depreciation test terminal
CN106124950A (en) * 2016-08-30 2016-11-16 合肥智博电气有限公司 High voltage electric transmission cable on-line measuring device
CN107037323A (en) * 2017-04-21 2017-08-11 国网河南省电力公司鹤壁供电公司 High-tension cable fault verification system and method
CN107300661A (en) * 2017-08-24 2017-10-27 国家电网公司 Oil immersed current transformer discharge in insulation pulse detecting equipment
CN107300661B (en) * 2017-08-24 2019-11-05 国家电网公司 Oil immersed current transformer discharge in insulation pulse detecting equipment

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