TW202144796A - On-line measuring system for partial discharges signals of cable joints - Google Patents

On-line measuring system for partial discharges signals of cable joints Download PDF

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TW202144796A
TW202144796A TW109117308A TW109117308A TW202144796A TW 202144796 A TW202144796 A TW 202144796A TW 109117308 A TW109117308 A TW 109117308A TW 109117308 A TW109117308 A TW 109117308A TW 202144796 A TW202144796 A TW 202144796A
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cable
partial discharge
grounding
current sensors
electrically connected
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TW109117308A
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TWI737309B (en
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吳瑞南
張建國
李卓翰
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國立臺灣科技大學
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Abstract

An on-line measuring system for partial discharges signals of cable joints includes two high-frequency current transformers with the same polarity, at least one ground ring and a monitoring unit. The two high-frequency current transformers respectively surround the outer surface of two shoulder portions of the cable joint. The ground ring conductively contacts an outer semiconductive layer of the cable joint. The cable shielding layers of two cables connected to the two ends of the cable joint are crossed from the outside of the two high-frequency current transformers, and are electrically connected to the ground ring. The exposed inner wires of the two cables after removing the cable shielding layer are respectively inserted into the two ends of the cable joint, and pass through the insides of the two high-frequency current transformers simultaneously. Two sensing signals generated by the two high-frequency current transformers are transferred to the monitoring unit for signal processing. The invention can eliminate the external noise of the cable joint when measuring the partial discharges inside the cable joint; and eliminate the internal noise of the cable joint when measuring the partial discharges outside the cable joint.

Description

電纜接頭局部放電信號的線上量測系統On-line measurement system of partial discharge signal of cable joint

本發明是關於一種電纜接頭局部放電信號的線上量測系統有關,特別是關於一種在地下電纜管道之環境中用於量測直線接頭之內部放電信號的線上量測系統。The present invention relates to an on-line measuring system for partial discharge signals of cable joints, in particular to an on-line measuring system for measuring the internal discharge signals of linear joints in the environment of underground cable ducts.

地下配電系統在歷經長期負荷下,電纜絕緣材料可能發生劣化乃至故障。一般而言,地下電纜事故依發生部位可分成電纜線本體與電纜接頭處。據統計得知地下電纜事故多發生在電纜接頭處,例如直線接頭和終端接頭。因此針對地下電纜線的電纜接頭之絕緣狀態研究,並利用線上檢測和診斷,提供絕緣狀態之維護,已經是高壓電力設備維護發展的重要項目。Under the long-term load of the underground power distribution system, the cable insulation material may deteriorate or even fail. Generally speaking, the underground cable accident can be divided into the cable body and the cable joint according to the location. According to statistics, underground cable accidents mostly occur at cable joints, such as straight joints and terminal joints. Therefore, research on the insulation status of the cable joints of underground cables, and the use of online detection and diagnosis to provide maintenance of the insulation status has become an important project for the maintenance and development of high-voltage power equipment.

目前對於地下電纜絕緣狀態之評估,國際間使用局部放電數據做為主要指標。若能即時監測局部放電數據,則可以對高壓電力設備的初期破壞提供可預期的檢修依據,進而依其絕緣之狀態適時進行維修,以避免非預期停電的發生。At present, for the evaluation of the insulation status of underground cables, partial discharge data is used as the main indicator internationally. If the partial discharge data can be monitored in real time, it can provide a predictable maintenance basis for the initial damage of high-voltage power equipment, and then carry out timely maintenance according to the state of its insulation, so as to avoid the occurrence of unexpected power failures.

常見之地下電纜接頭檢測方式可分為非電氣檢測與電氣檢測。非電氣檢測法例如以紅外線探照儀人工檢測電纜接頭的表面溫度,或是利用超音波檢測。電氣檢測通常以高頻感測器進行現場線上量測,其容易進行定量之測試並具有良好的靈敏度。Common underground cable joint detection methods can be divided into non-electrical detection and electrical detection. Non-electrical detection methods, such as manual detection of the surface temperature of the cable joint with an infrared searcher, or ultrasonic detection. Electrical testing is usually performed on-site with high-frequency sensors, which are easy to perform quantitative tests and have good sensitivity.

然而,採用紅外線探照儀進行人工檢測並不能得知電纜接頭的局部放電量值,且無法達到即時線上監測的目的。一般超音波檢測需利用集音器收集超音波,且對於絕緣材料深層局部放電之檢測其靈敏度很低,較適用於氣封開關設備(Gas Insulated Switchgear),其運用於電纜線及電纜接頭的量測效果有限。However, manual detection with an infrared searchlight cannot know the partial discharge value of the cable joint, and cannot achieve the purpose of real-time online monitoring. Generally, ultrasonic detection needs to use a sound collector to collect ultrasonic waves, and its sensitivity to the detection of deep partial discharge of insulating materials is very low. It is more suitable for gas sealed switchgear (Gas Insulated Switchgear). The test effect is limited.

傳統採用高頻電流感測器(High Frequency Current Transformer, HFCT)量測電纜接頭的局部放電時,只能安裝在接地線或電纜線本體上,其所擷取到的信號裡會伴隨著許多外部雜訊,因而增加圖譜辨識上的困難度,並且會產生局部放電信號衰減的問題。When the high frequency current transformer (HFCT) is traditionally used to measure the partial discharge of the cable joint, it can only be installed on the ground wire or the cable body, and the captured signal will be accompanied by many external noise, thus increasing the difficulty of spectrum identification and causing the problem of partial discharge signal attenuation.

本發明之一目的在於提供一種電纜接頭局部放電信號的線上量測系統,能排除外部電流所產生的雜訊,並增強局部放電信號。One object of the present invention is to provide an online measurement system for partial discharge signals of cable joints, which can eliminate noise generated by external currents and enhance partial discharge signals.

為了達到上述目的,本發明提供一種電纜接頭局部放電信號的線上量測系統,適用於量測一直線接頭的內部及外部發生的局部放電。其中,直線接頭包覆兩電纜線的壓接處。此系統的基本組成包括兩電流感測器、至少一接地環及一監測單元。兩電流感測器具有相同極性,並分別裝設於直線接頭的兩肩部。當直線接頭發生局部放電時,兩電流感測器產生兩感測信號。接地環設置於兩電流感測器之間,並且可導電的接觸於直線接頭的外半導電層。將直線接頭兩端所連接的兩電纜線各自的電纜遮蔽層從兩電流感測器之外部跨越並且與接地環電性連接。兩電纜線去除電纜遮蔽層後裸露出的內層電纜插入直線接頭,並同時穿過兩電流感測器之其一的內側。監測單元電性連接該兩電流感測器,用以對兩感測信號執行一信號處理流程,藉此產生一局部放電數據。In order to achieve the above object, the present invention provides an online measurement system for partial discharge signals of cable joints, which is suitable for measuring partial discharges generated inside and outside a cable joint. Among them, the straight joint covers the crimping part of the two cables. The basic components of the system include two current sensors, at least one grounding ring and a monitoring unit. The two current sensors have the same polarity and are respectively installed on the two shoulders of the linear connector. When a partial discharge occurs at the linear joint, the two current sensors generate two sensing signals. The grounding ring is arranged between the two current sensors, and can be conductively contacted with the outer semiconducting layer of the linear connector. The respective cable shielding layers of the two cables connected to the two ends of the straight connector are spanned from the outside of the two current sensors and are electrically connected with the grounding ring. The exposed inner layer cables of the two cables after removing the cable shielding layer are inserted into the straight connector, and simultaneously pass through the inner side of one of the two current sensors. The monitoring unit is electrically connected to the two current sensors for performing a signal processing process on the two sensing signals, thereby generating a partial discharge data.

在一實施例中,兩電纜線各自的電纜遮蔽層從其外部被剝離,被剝離的兩電纜遮蔽層接合成一電纜跨接遮蔽線,電纜跨接遮蔽線從兩電流感測器之外部跨越並且與接地環電性連接。In one embodiment, the respective cable shielding layers of the two cables are stripped from the outside, and the stripped two cable shielding layers are combined into a cable jumper shielding wire, and the cable jumper shielding wire is crossed from the outside of the two current sensors. And it is electrically connected with the grounding ring.

在一實施例中,接地環的數量為一個,接地環與電纜跨接遮蔽線之間是以單一接地引線相連接。In one embodiment, the number of grounding rings is one, and a single grounding lead is used to connect the grounding ring and the cable jumper shielding wire.

在一實施例中,接地環的數量為二個,兩接地環分別裝設於直線接頭的兩肩部。兩接地環分別以兩接地引線電性連接至電纜跨接遮蔽線。每一接地環包括兩半圓環形導電片,每一半圓環形導電片具有一接地孔。每一接地引線具有一端綁在半圓環形導電片之其一的接地孔,另一端與電纜跨接遮蔽線壓接。In one embodiment, the number of grounding rings is two, and the two grounding rings are respectively installed on two shoulders of the linear joint. The two grounding rings are respectively electrically connected to the cable jumper shielding wire with two grounding leads. Each grounding ring includes two semi-circular conductive sheets, and each semi-circular conductive sheet has a grounding hole. Each grounding lead has a grounding hole with one end tied to one of the semicircular conductive sheets, and the other end is crimped with the cable jumper shielding wire.

在一實施例中,監測單元用以量測直線接頭的內部放電,其包括二振盪電路、二突波保護元件、一第一多工器、一差動器、一放大器、一絕對值保持電路、一峰值保持電路、一類比數位轉換器及一微控制器。兩振盪電路分別電性連接於兩電流感測器,兩突波保護元件分別電性連接於兩振盪電路並且皆與第一多工器電性連接。第一多工器、差動器及放大器依序電性連接。絕對值保持電路連接於放大器與峰值保持電路之間,峰值保持電路電性連接於絕對值保持電路與類比數位轉換器之間。In one embodiment, the monitoring unit is used to measure the internal discharge of the linear joint, which includes two oscillator circuits, two surge protection elements, a first multiplexer, a differentiator, an amplifier, and an absolute value hold circuit. , a peak hold circuit, an analog digital converter and a microcontroller. The two oscillating circuits are electrically connected to the two current sensors respectively, the two surge protection elements are electrically connected to the two oscillating circuits respectively, and both are electrically connected to the first multiplexer. The first multiplexer, the differentiator and the amplifier are electrically connected in sequence. The absolute value hold circuit is connected between the amplifier and the peak value hold circuit, and the peak value hold circuit is electrically connected between the absolute value hold circuit and the analog-to-digital converter.

在一實施例中,監測單元還包括一加法器及一第二多工器,用以量測直線接頭的外部放電。其中,加法器與差動器形成一並聯結構,並聯結構電性連接於第一多工器及第二多工器之間,第二多工器電性連接於並聯結構與放大器之間。In one embodiment, the monitoring unit further includes an adder and a second multiplexer for measuring the external discharge of the linear connector. The adder and the differentiator form a parallel structure, the parallel structure is electrically connected between the first multiplexer and the second multiplexer, and the second multiplexer is electrically connected between the parallel structure and the amplifier.

在一實施例中,每一電流感測器係由兩半圓環形感測元件組合而成,適合以包夾的方式臨時安裝在既有地下電纜管道中的直線接頭上。In one embodiment, each current sensor is composed of two semi-circular ring-shaped sensing elements, and is suitable for being temporarily installed on a straight joint in an existing underground cable duct in a sandwiching manner.

在一實施例中,每一電流感測器為單一完整環形感測元件,適用在直線接頭安裝施工時一併裝設於其兩端。In one embodiment, each current sensor is a single complete ring-shaped sensing element, which is suitable for being installed at both ends of the linear connector during installation and construction.

本發明採用非侵入式高頻電流感測器(High Frequency Current Transformer, HFCT)量測電纜接頭上的局部放電的脈衝電流,且搭配後端差動電路等信號處理模組,可準確辨識出局部放電信號來自電纜接頭的內部或外部,並區隔雜訊,得到局部放電的相關數據。The present invention adopts a non-invasive high frequency current transformer (HFCT) to measure the pulse current of partial discharge on the cable joint, and is matched with a signal processing module such as a back-end differential circuit to accurately identify the partial discharge. The discharge signal comes from the inside or outside of the cable joint, and the noise is separated to obtain the relevant data of partial discharge.

有關本發明之前述及其他技術內容、特點與功效,在以下配合參考圖式之一較佳實施例的詳細說明中,將可清楚的呈現。以下實施例中所提到的方向用語,例如:上、下、左、右、前或後等,僅是用於參照隨附圖式的方向。因此,該等方向用語僅是用於說明並非是用於限制本發明。The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only used to refer to the directions of the accompanying drawings. Therefore, these directional terms are only used to illustrate and not to limit the present invention.

圖1是本發明之電纜接頭局部放電信號的線上量測系統及其使用環境之一實施例。本實施例之電纜接頭局部放電信號的線上量測系統10 (以下簡稱為「系統10」) 適用在一人孔20內部的R、S、T三相25 kV配電級高壓地下電纜管道之環境。圖1顯示的地下電纜管道中,每一單相電纜包括一直線接頭30及其左、右兩端連接的電纜線31L及31R。25 kV配電級的直線接頭30一般用於饋線(600A, 500MCM)和分歧線(200A, #1 AMG)或與此兩者相似的結構。對於每一直線接頭30,系統10提供兩電流感測器11L及11R、兩設置於外殼122內的接地環(見圖2的接地環12L及12R),以及一局部放電監測單元(Partial Discharge Monitoring Unit, PDMU) 13,用以量測直線接頭30內部發生的局部放電。FIG. 1 is an embodiment of the on-line measurement system of the partial discharge signal of the cable joint and its use environment of the present invention. The on-line measurement system 10 (hereinafter referred to as “system 10”) for partial discharge signals of cable joints of the present embodiment is suitable for the environment of R, S, T three-phase 25 kV distribution-grade high-voltage underground cable conduits inside one manhole 20 . In the underground cable duct shown in FIG. 1 , each single-phase cable includes a cable joint 30 and cables 31L and 31R connected to the left and right ends thereof. 25 kV distribution level straight joints 30 are generally used for feeder (600A, 500MCM) and branch (200A, #1 AMG) or similar structures to both. For each linear connector 30, the system 10 provides two current sensors 11L and 11R, two grounding rings (see the grounding rings 12L and 12R in FIG. 2) disposed in the housing 122, and a partial discharge monitoring unit (Partial Discharge Monitoring Unit). , PDMU) 13, used to measure the partial discharge that occurs inside the linear joint 30.

本實施例的電流感測器11L及11R是採用高頻電流感測器,也稱為高頻比流器。兩電流感測器11L及11R裝設於直線接頭30的左、右兩端,用以感應直線接頭30內部局部放電脈衝電流而產生兩感測信號,並且將所測得的兩感測信號傳至局部放電監測單元13進行一差動信號處理流程,藉此產生一局部放電數據。兩外殼122內部的接地環12L及12R裝設於直線接頭30兩端之肩部,並且可導電的接觸於肩部的外半導電層,用以避免兩電流感測器11L及11R所測得的局部放電信號受到雜訊的干擾。局部放電監測單元13可對兩電流感測器11L及11R傳來的局部放電信號進行後續信號處理,並將處理後所得的數據透過網路14傳至一電腦進行絕緣診斷分析。The current sensors 11L and 11R of the present embodiment use high-frequency current sensors, which are also called high-frequency current comparators. The two current sensors 11L and 11R are installed at the left and right ends of the linear connector 30 to induce the partial discharge pulse current inside the linear connector 30 to generate two sensing signals, and transmit the two detected sensing signals. A differential signal processing process is performed to the partial discharge monitoring unit 13, thereby generating partial discharge data. The ground rings 12L and 12R inside the two casings 122 are installed on the shoulders of the two ends of the straight connector 30, and can be conductively contacted with the outer semiconducting layer of the shoulders, so as to avoid the detection of the two current sensors 11L and 11R. The partial discharge signal is disturbed by noise. The partial discharge monitoring unit 13 can perform subsequent signal processing on the partial discharge signals from the two current sensors 11L and 11R, and transmit the processed data to a computer through the network 14 for insulation diagnosis and analysis.

圖2是針對單相電纜說明系統10與直線接頭30的接線結構之一實施例。直線接頭30具有兩肩部30L、30R位於其兩端,以及一外半導電層30S位於其表面。直線接頭30的兩端口分別連接兩電纜線31L及31R的內層纜線311L、311R。在系統10與直線接頭30進行接線時,將兩電流感測器11L及11R分別裝設於直線接頭30的兩肩部30L及30R,並且電性連接於局部放電監測單元13。在本實施例中,兩電流感測器11L及11R需為相同極性。FIG. 2 illustrates one embodiment of the wiring structure of the system 10 and the straight connector 30 for a single-phase cable. The linear connector 30 has two shoulders 30L, 30R on both ends thereof, and an outer semiconducting layer 30S on its surface. The two ports of the straight connector 30 are respectively connected to the inner layer cables 311L and 311R of the two cables 31L and 31R. When the system 10 is connected to the linear connector 30 , the two current sensors 11L and 11R are respectively installed on the two shoulders 30L and 30R of the linear connector 30 , and are electrically connected to the partial discharge monitoring unit 13 . In this embodiment, the two current sensors 11L and 11R need to have the same polarity.

本實施例的接地環12L或12R本質上為一導電片,裝設於外殼122的內側壁,環繞直線接頭30的肩部30L及30R且接觸於其外半導電層30S。外殼122除了容納接地環12L或12R之外,同時可容納兩電流感測器11L及11R。需注意的是,兩接地環12L或12R的位置皆需在兩電流感測器11L及11R之間。The grounding ring 12L or 12R of this embodiment is essentially a conductive sheet, which is installed on the inner sidewall of the housing 122 , surrounds the shoulders 30L and 30R of the linear connector 30 and contacts the outer semiconducting layer 30S. In addition to accommodating the grounding ring 12L or 12R, the casing 122 can also accommodate the two current sensors 11L and 11R. It should be noted that the positions of the two grounding rings 12L and 12R must be between the two current sensors 11L and 11R.

同時參照圖2A,每一電纜線31L(或31R)具有一中心導體313,中心導體313外側依序包覆一內半導電層314、一絕緣層315、一外半導電層316、一電纜遮蔽層32L(或32R)及一外皮312L(或312R)。值得注意的是,為了避免外部雜訊的干擾,將兩電纜線31L及31R的一部分電纜遮蔽層32L、32R連同外皮312L、312R一併剝離,再將剝離出的兩電纜遮蔽層32L及32R接合成一電纜跨接遮蔽線32。使電纜跨接遮蔽線32從兩電流感測器11L及11R的外部跨過,再利用兩接地引線15L及15R分別與兩接地環12L及12R電性連接。在一實施例中,兩接地引線15L及15R各自具有一端連接在接地環12L及12R的一接地孔124上,另一端連接至一壓接端子33,通過壓接端子33與電纜跨接遮蔽線32壓接在一起。如此,流經電纜遮蔽層32L及32R的電流不會從兩電流感測器11L及11R的內側通過,藉此可排除流經電纜遮蔽層32L及32R的電流所造成的雜訊。2A, each cable 31L (or 31R) has a center conductor 313, and the outer side of the center conductor 313 is sequentially coated with an inner semiconducting layer 314, an insulating layer 315, an outer semiconducting layer 316, and a cable shield. Layer 32L (or 32R) and a skin 312L (or 312R). It is worth noting that, in order to avoid the interference of external noise, a part of the cable shielding layers 32L and 32R of the two cables 31L and 31R are stripped together with the outer skins 312L and 312R, and then the stripped two cable shielding layers 32L and 32R are connected. The shielded wire 32 is combined into a cable jumper. The cable jumper shielding wire 32 is crossed from the outside of the two current sensors 11L and 11R, and then the two grounding leads 15L and 15R are electrically connected to the two grounding rings 12L and 12R, respectively. In one embodiment, the two grounding leads 15L and 15R each have one end connected to a grounding hole 124 of the grounding rings 12L and 12R, and the other end connected to a crimping terminal 33 , and the shielding wire is crossed with the cable through the crimping terminal 33 . 32 crimped together. In this way, the current flowing through the cable shielding layers 32L and 32R does not pass through the inner sides of the two current sensors 11L and 11R, thereby eliminating noise caused by the current flowing through the cable shielding layers 32L and 32R.

電纜線31L或31R在其電纜遮蔽層32L、32R及外皮312L、312R被剝離後裸露出一內層纜線311L、311R。內層纜線311L、311R包含中心導體313、內半導電層314、絕緣層315、外半導電層316等各層。接線時是將內層纜線311L、311R插入直線接頭30同時穿過兩電流感測器11L及11R的內側。After the cable shielding layers 32L and 32R and the outer sheaths 312L and 312R of the cable 31L or 31R are peeled off, an inner layer cable 311L and 311R is exposed. The inner layer cables 311L and 311R include various layers such as a center conductor 313 , an inner semiconducting layer 314 , an insulating layer 315 , and an outer semiconducting layer 316 . When connecting, the inner layer cables 311L and 311R are inserted into the linear connector 30 and passed through the inner sides of the two current sensors 11L and 11R.

圖2B顯示內層纜線311L、311R插入直線接頭30內部的構造。圖2B中,直線接頭30的兩肩部30L及30R尚未裝上電流感測器11L、11R及接地環12L、12R,肩部30R具有一孔洞稱為接地眼124A用以提供接地引線15R綁紮。直線接頭30由外而內包括外半導電層30S、絕緣層301、內半導電層302及導體接續套管303。在兩內層纜線311L、311R插入直線接頭30後,兩內層纜線311L、311R的中心導體313通過導體接續套管303達成電性連接。兩內層纜線311L、311R的內半導電層314、絕緣層315、外半導電層316分別對應的與直線接頭30的內半導電層302、絕緣層301、外半導電層30S電性連接。值得一提的是,經實驗證實若在圖2B的結構裝上電流感測器11L及11R但不加裝接地環12L及12R,其排除雜訊的效果遠不如加裝接地環12L及12R之後的效果。因此,加裝接地環12L及12R可大幅提升量測準確度,此為本領域技術人員難以預期的效果。FIG. 2B shows a configuration in which the inner layer cables 311L, 311R are inserted into the linear joint 30 . In FIG. 2B , the two shoulders 30L and 30R of the straight connector 30 have not yet installed the current sensors 11L, 11R and the grounding rings 12L, 12R, and the shoulder 30R has a hole called a ground eye 124A for binding the ground lead 15R. The straight joint 30 includes an outer semiconducting layer 30S, an insulating layer 301 , an inner semiconducting layer 302 and a conductor connecting sleeve 303 from the outside to the inside. After the two inner layer cables 311L and 311R are inserted into the straight connector 30 , the central conductors 313 of the two inner layer cables 311L and 311R are electrically connected through the conductor connection sleeve 303 . The inner semi-conductive layer 314 , the insulating layer 315 and the outer semi-conductive layer 316 of the two inner-layer cables 311L and 311R are respectively electrically connected to the inner semi-conductive layer 302 , the insulating layer 301 and the outer semi-conductive layer 30S of the straight connector 30 , respectively. . It is worth mentioning that it has been proved by experiments that if the current sensors 11L and 11R are installed in the structure of FIG. 2B but the grounding rings 12L and 12R are not installed, the effect of eliminating noise is far inferior to that after installing the grounding rings 12L and 12R. Effect. Therefore, adding the grounding rings 12L and 12R can greatly improve the measurement accuracy, which is an effect that is difficult for those skilled in the art to expect.

圖2的實施例中,流經內層纜線311L、311R之中心導體313的外部電流方向皆向左,直線接頭30的內部放電的脈衝電流方向為一左一右。將兩電流感測器11L及11R感應外部電流及內部放電的脈衝電流所產生的感測信號通過一差動器134進行相減運算,則外部電流在兩電流感測器11L及11R上產生相同極性和大小的感測信號,經過差動器134後相減為零,藉此可排除流經中心導體313的外部電流對直線接頭30的內部的局部放電信號所造成的干擾。反之,內部放電的脈衝電流在兩電流感測器11L及11R上會所產生相同大小但極性相反的感測信號,經過差動器134後相減的信號則會加倍,藉此可增強直線接頭30的內部的局部放電信號。In the embodiment of FIG. 2 , the directions of the external currents flowing through the center conductors 313 of the inner cables 311L and 311R are both leftwards, and the pulse current directions of the internal discharge of the linear joint 30 are one left and one right. The sensing signals generated by the two current sensors 11L and 11R inducing the external current and the pulse current of the internal discharge are subtracted through a differential 134, and the external currents are the same on the two current sensors 11L and 11R. The sensing signals of polarity and magnitude are subtracted to zero after passing through the differential 134 , thereby eliminating the interference caused by the external current flowing through the center conductor 313 to the internal partial discharge signal of the linear connector 30 . On the contrary, the pulse current of the internal discharge will generate sensing signals of the same magnitude but opposite polarities on the two current sensors 11L and 11R. After passing through the differential 134, the subtracted signals will be doubled, thereby enhancing the linear connector 30. the internal partial discharge signal.

圖3A至圖3C是圖2所示實施例的直線接頭30左肩部30L與電流感測器11L、接地環12L及外殼122的組合結構示意圖,其中圖3A為分解圖、圖3B為組合圖、圖3C為側視圖。圖3A至圖3C所示的外殼122內側皆含有接地環12L環繞肩部30L。3A to 3C are schematic views of the combined structure of the left shoulder 30L of the linear connector 30, the current sensor 11L, the grounding ring 12L and the housing 122 of the embodiment shown in FIG. 2 , wherein FIG. 3A is an exploded view, FIG. 3B is a combined view, Figure 3C is a side view. The inner side of the housing 122 shown in FIGS. 3A to 3C includes the ground ring 12L surrounding the shoulder 30L.

圖3A的電流感測器11L為單一環形感測元件,其具有完整環狀結構並包含線圈,用於感應脈衝電流信號並連接至局部放電監測單元13,適合在直線接頭30安裝施工時一併裝設於其兩端。圖3A中直線接頭30的左端穿過高頻電流感測器11L內側。本實施例的接地環12L包括兩半圓環形導電片,每一半圓環形導電片例如圖3A中的導電銅箔125。外殼122的左側部用以容納電流感測器11L;右側部依導電銅箔125的形狀設計,用以容納導電銅箔125。外殼122的右側部具有一孔洞124B。將半圓環形導電銅箔125貼附於半圓環形外殼122內側壁,導電銅箔125與直線接頭30之肩部30L的外半導電層30S緊密接觸,其接地孔124與外殼122上的孔洞124B以及肩部30L上的接地眼124A對位組合後其外觀結構如圖3B。The current sensor 11L of FIG. 3A is a single ring-shaped sensing element, which has a complete ring structure and includes a coil for inducing a pulse current signal and connecting to the partial discharge monitoring unit 13 , which is suitable for installation and construction of the linear joint 30 together. installed at both ends. The left end of the straight connector 30 in FIG. 3A passes through the inside of the high-frequency current sensor 11L. The grounding ring 12L of this embodiment includes two semi-circular conductive sheets, each of which is for example the conductive copper foil 125 in FIG. 3A . The left part of the casing 122 is used for accommodating the current sensor 11L; the right part is designed according to the shape of the conductive copper foil 125 to accommodate the conductive copper foil 125 . The right side of the housing 122 has a hole 124B. The semi-circular conductive copper foil 125 is attached to the inner side wall of the semi-circular shell 122 , and the conductive copper foil 125 is in close contact with the outer semi-conductive layer 30S of the shoulder 30L of the straight connector 30 , and the grounding hole 124 and the hole 124B on the shell 122 and The appearance structure of the grounding eye 124A on the shoulder 30L after alignment and combination is shown in FIG. 3B .

圖3C顯示半圓環形外殼122提供多個螺孔123,用以與另一半圓 環形外殼122對位後組合固定如圖3B。組合後接地孔124、接地眼124A及孔洞124B三者重合,可供接地引線15L的一端綁紮,並將接地引線15L的另一端與電纜跨接遮蔽線32的左端壓接。Fig. 3C shows that the semi-circular annular casing 122 provides a plurality of screw holes 123 for aligning with the other semi-circular annular casing 122 and then assembled and fixed as shown in Fig. 3B. After the combination, the grounding hole 124 , the grounding eye 124A and the hole 124B are overlapped, and one end of the grounding lead 15L can be bound, and the other end of the grounding lead 15L can be crimped with the left end of the cable jumper shielding wire 32 .

圖3D及圖3E顯示第二種型式的電流感測器110R,其安裝在直線接頭30右端。電流感測器110R係由兩半圓環形感測元件112R及114R組合而成,適合以包夾的方式臨時安裝在既有地下電纜管道中的直線接頭30上。3D and 3E show the second type of current sensor 110R, which is installed at the right end of the straight connector 30 . The current sensor 110R is composed of two semi-circular ring-shaped sensing elements 112R and 114R, and is suitable for being temporarily installed on the straight joint 30 in the existing underground cable duct in a sandwiching manner.

圖4是系統10與直線接頭30的接線結構之另一實施例。與圖2之實施例不同的是,本實施例的接地環12的數量只有一個,環繞於直線接頭30的中間部位,位於兩電流感測器11L及11R之間,與其外半導電層30S可導電的緊密接觸。並且,接地環12與電纜跨接遮蔽線32之間是以單一接地引線15連接。圖4的結構雖然較為簡化,但亦可達到排除流經電纜遮蔽層32L及32R及中心導體313等源於直線接頭30外部的電流所造成的雜訊干擾,並且增強直線接頭30的內部的局部放電信號等功效。FIG. 4 is another embodiment of the wiring structure of the system 10 and the linear connector 30 . Different from the embodiment of FIG. 2 , the number of the grounding ring 12 in the present embodiment is only one, which surrounds the middle portion of the straight connector 30 and is located between the two current sensors 11L and 11R, and the outer semiconducting layer 30S thereof can be Conductive close contact. In addition, the grounding ring 12 and the cable jumper shielding wire 32 are connected by a single grounding lead 15 . Although the structure of FIG. 4 is relatively simplified, it can also eliminate the noise interference caused by the current flowing through the cable shielding layers 32L and 32R and the center conductor 313 originating from the outside of the straight joint 30 , and enhance the internal part of the straight joint 30 . Discharge signal and other functions.

圖5是本發明之一實施例的局部放電監測單元(Partial Discharge Monitoring Unit, PDMU)功能方塊示意圖。對於裝設在每一直線接頭30上的兩電流感測器11L及11R及兩接地環12L及12R之組合結構,局部放電監測單元13提供二振盪電路131、二突波保護元件132、一多工器133、一差動器134、一放大器135、一絕對值保持電路136、一峰值保持電路137、一類比數位轉換器(Analog-to-Digital Converter, ADC) 138及一微控制器(Microcontroller Unit, MCU) 139。兩振盪電路131分別電性連接於兩電流感測器11L及11R。兩突波保護元件132分別電性連接於兩振盪電路131並且皆與多工器133電性連接。隨後,多工器133、差動器134及放大器135依序電性連接。特別的是,本實施例將絕對值保持電路136連接於放大器135與峰值保持電路137之間,並將峰值保持電路137電性連接於絕對值保持電路136與類比數位轉換器138之間。FIG. 5 is a functional block diagram of a partial discharge monitoring unit (Partial Discharge Monitoring Unit, PDMU) according to an embodiment of the present invention. For the combined structure of the two current sensors 11L and 11R and the two grounding rings 12L and 12R installed on each linear connector 30 , the partial discharge monitoring unit 13 provides two oscillator circuits 131 , two surge protection elements 132 , and a multiplexer 133, a differentiator 134, an amplifier 135, an absolute value hold circuit 136, a peak hold circuit 137, an Analog-to-Digital Converter (ADC) 138, and a Microcontroller Unit , MCU) 139. The two oscillator circuits 131 are electrically connected to the two current sensors 11L and 11R, respectively. The two surge protection elements 132 are respectively electrically connected to the two oscillator circuits 131 and both are electrically connected to the multiplexer 133 . Then, the multiplexer 133 , the differentiator 134 and the amplifier 135 are electrically connected in sequence. Particularly, in this embodiment, the absolute value hold circuit 136 is connected between the amplifier 135 and the peak hold circuit 137 , and the peak hold circuit 137 is electrically connected between the absolute value hold circuit 136 and the analog-to-digital converter 138 .

在地下電纜管道中,R、S、T三相電纜的直線接頭30各自經由兩電流感測器11L及11R產生兩組感測信號,兩感測信號分別由兩振盪電路131延長其局部放電脈衝辨識時間,經兩突波保護元件132避免電壓突波損壞後端的信號處理模組。接著,透過多工器133選擇量測相別,經差動器134辨識是否為直線接頭30的內部信號,至放大器135將信號放大。經絕對值保持電路136將信號轉為正值,再由峰值保持電路137取信號最大值,透過類比數位轉換器138取樣傳至微控制器139。最後,微控制器139將數據傳輸至電腦16做絕緣診斷分析。In the underground cable duct, the straight joints 30 of the R, S, and T three-phase cables each generate two sets of sensing signals through the two current sensors 11L and 11R, and the two sensing signals are respectively extended by the two oscillating circuits 131. During the identification time, the two surge protection elements 132 prevent the voltage surge from damaging the signal processing module at the rear end. Next, the measurement phase is selected through the multiplexer 133 , and the differential 134 identifies whether it is the internal signal of the linear connector 30 , and the amplifier 135 amplifies the signal. The signal is converted to a positive value by the absolute value hold circuit 136 , and the maximum value of the signal is taken by the peak hold circuit 137 , and the sample is sent to the microcontroller 139 through the analog-to-digital converter 138 . Finally, the microcontroller 139 transmits the data to the computer 16 for insulation diagnostic analysis.

圖6是本發明之另一實施例的局部放電監測單元功能方塊示意圖。與圖5不同的是,局部放電監測單元13A多了一加法器134A及一第二多工器133A。加法器134A與差動器134形成一並聯結構,並聯結構電性連接於第一多工器133及第二多工器133A之間,第二多工器133A電性連接於並聯結構與放大器135之間。第一多工器133及第二多工器133A皆與微控制器139電性連接。6 is a functional block diagram of a partial discharge monitoring unit according to another embodiment of the present invention. The difference from FIG. 5 is that the partial discharge monitoring unit 13A has an adder 134A and a second multiplexer 133A. The adder 134A and the differentiator 134 form a parallel structure, the parallel structure is electrically connected between the first multiplexer 133 and the second multiplexer 133A, and the second multiplexer 133A is electrically connected to the parallel structure and the amplifier 135 between. Both the first multiplexer 133 and the second multiplexer 133A are electrically connected to the microcontroller 139 .

將兩電流感測器11L及11R感應直線接頭30的外部發生的局部放電所產生的感測信號通過加法器134A進行相加運算,則外部放電在兩電流感測器11L及11R上產生相同極性和大小的感測信號,經過加法器134後會加倍,藉此可增強直線接頭30的外部放電信號。反之,內部電流在兩電流感測器11L及11R上會所產生相同大小但極性相反的感測信號,經過加法器134A後相減為零。在量測直線接頭30的外部放電時可藉此排除其內部電流所造成的雜訊干擾。The sensing signals generated by the two current sensors 11L and 11R induced by partial discharges generated outside the linear connector 30 are added by the adder 134A, and the external discharges generate the same polarity on the two current sensors 11L and 11R The sensing signal of the sum and the magnitude will be doubled after passing through the adder 134 , thereby enhancing the external discharge signal of the linear connector 30 . On the contrary, the sensing signals of the same magnitude but opposite polarities generated by the internal currents on the two current sensors 11L and 11R are subtracted to zero after passing through the adder 134A. When measuring the external discharge of the linear connector 30, the noise interference caused by the internal current can be eliminated.

綜上所述,本發明利用兩組同極性之非侵入式高頻電流感測器安置在電纜接頭兩端,且高頻電流感測器外部設有接地環,其固定於電纜接頭兩端之肩部,利用接地環將電纜的遮蔽層跨過高頻電流感測器而連接至電纜接頭的外半導電層。相較不設接地環的情況,本發明能有效量測出電纜接頭內部的局部放電脈衝電流信號之極性大小,再由後端差動電路濾除來自外部線路的雜訊;亦可量測出電纜接頭外部的局部放電脈衝電流信號之極性大小,再由後端加法器濾除來自接頭內部的雜訊。之後,再經放大電路、絕對值電路、峰值保持電路、類比信號取樣電路至微控制器,取得內部或外部局部放電演進圖譜,包含放電量、電壓相位、脈衝時間,最後將量測信號整合物連網技術傳至雲端做即時監控。藉由本發明之電纜接頭局部放電信號的線上量測系統,可準確辨識出局部放電信號來自電纜接頭的內部或外部,並區隔雜訊,進而獲得局部放電的相關數據。To sum up, the present invention utilizes two sets of non-intrusive high-frequency current sensors of the same polarity to be installed at both ends of the cable joint, and a grounding ring is provided outside the high-frequency current sensor, which is fixed on the two ends of the cable joint. At the shoulder, the shielding layer of the cable is connected to the outer semiconducting layer of the cable splice across the high frequency current sensor using a ground ring. Compared with the case where the grounding ring is not provided, the present invention can effectively measure the polarity of the partial discharge pulse current signal inside the cable joint, and then filter the noise from the external circuit by the rear differential circuit; The polarity of the partial discharge pulse current signal outside the cable joint is determined, and the noise from the inside of the joint is filtered out by the back-end adder. After that, the amplifier circuit, absolute value circuit, peak hold circuit, and analog signal sampling circuit are sent to the microcontroller to obtain the internal or external partial discharge evolution map, including the discharge amount, voltage phase, and pulse time. Finally, the measurement signal is integrated into the The networking technology is transmitted to the cloud for real-time monitoring. With the on-line measurement system of the partial discharge signal of the cable joint of the present invention, the partial discharge signal can be accurately identified from the inside or outside of the cable joint, and the noise can be separated, thereby obtaining the relevant data of the partial discharge.

惟以上所述者,僅為本發明之較佳實施例而已,當不能以此限定本發明實施之範圍,即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾,皆仍屬本發明專利涵蓋之範圍內。另外本發明的任一實施例或申請專利範圍不須達成本發明所揭露之全部目的或優點或特點。此外,摘要部分和標題僅是用來輔助專利文件搜尋之用,並非用來限制本發明之權利範圍。However, the above are only preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, All still fall within the scope of the patent of the present invention. In addition, it is not necessary for any embodiment of the present invention or the claimed scope of the present invention to achieve all of the objects or advantages or features disclosed in the present invention. In addition, the abstract section and the title are only used to aid the search of patent documents and are not intended to limit the scope of the present invention.

10:電纜接頭局部放電信號的線上量測系統10: On-line measurement system of partial discharge signal of cable joint

11L、11R、110R:電流感測器11L, 11R, 110R: Current sensor

112R、114R:半圓環形感測元件112R, 114R: semi-circular ring sensing element

12、12L、12R:接地環12, 12L, 12R: grounding ring

122:外殼122: Shell

123:螺孔123: screw hole

124:接地孔124: ground hole

124A:接地眼124A: Ground Eye

124B:孔洞124B: Hole

125:導電銅箔125: Conductive copper foil

13、13A:局部放電監測單元13, 13A: Partial discharge monitoring unit

131:振盪電路131: Oscillation circuit

132:突波保護元件132: Surge protection components

133:多工器(第一多工器)133: Multiplexer (first multiplexer)

133A:第二多工器133A: Second Multiplexer

134:差動器134: Differential

134A:加法器134A: Adder

135:放大器135: Amplifier

136:絕對值保持電路136: Absolute value hold circuit

137:峰值保持電路137: Peak hold circuit

138:類比數位轉換器138: Analog to Digital Converter

139:微控制器139: Microcontroller

14:網路14: Internet

15、15L、15R:接地引線15, 15L, 15R: ground lead

16:電腦16: Computer

20:人孔20: Manhole

30:直線接頭30: Straight Connector

30L、30R:肩部30L, 30R: Shoulder

30S:外半導電層30S: Outer semiconducting layer

301:絕緣層301: Insulation layer

302:內半導電層302: Inner semiconducting layer

303:導體接續套管303: Conductor connection sleeve

31L、31R:電纜線31L, 31R: cable

311L、311R:內層纜線311L, 311R: inner cable

312L、312R:外皮312L, 312R: outer skin

313:中心導體313: Center conductor

314:內半導電層314: Inner semiconducting layer

315:絕緣層315: Insulation layer

316:外半導電層316: Outer semiconducting layer

32:電纜跨接遮蔽線32: Cable jumper shield wire

32L、32R:電纜遮蔽層32L, 32R: Cable shielding layer

33:壓接端子33: Crimp terminal

圖1是本發明之一實施例的地下電力電纜接頭之局部放電信號線上量測系統架構示意圖。FIG. 1 is a schematic diagram of the structure of an on-line measurement system for partial discharge signals of an underground power cable joint according to an embodiment of the present invention.

圖2是本發明之一實施例的地下電力電纜接頭局部放電信號量測接線示意圖。FIG. 2 is a schematic diagram of a partial discharge signal measurement wiring diagram of an underground power cable joint according to an embodiment of the present invention.

圖2A是本發明之一實施例的電纜線內層結構示意圖。FIG. 2A is a schematic diagram of the inner layer structure of a cable according to an embodiment of the present invention.

圖2B是本發明之一實施例的直線接頭內部構造示意圖。2B is a schematic diagram of the internal structure of a linear joint according to an embodiment of the present invention.

圖3A至圖3C是本發明之一實施例的直線接頭與高頻電流感測器及接地環的組合結構示意圖。3A to 3C are schematic diagrams of the combined structure of a linear connector, a high-frequency current sensor and a grounding ring according to an embodiment of the present invention.

圖3D及圖3E顯示另一種型式的高頻電流感測器結構示意圖。FIG. 3D and FIG. 3E are schematic structural diagrams of another type of high-frequency current sensor.

圖4是本發明之另一實施例的地下電力電纜接頭局部放電信號量測接線示意圖。FIG. 4 is a schematic diagram of the measurement wiring of the partial discharge signal of the underground power cable joint according to another embodiment of the present invention.

圖5是本發明之一實施例的局部放電監測單元(Partial Discharge Monitoring Unit, PDMU)功能方塊示意圖。FIG. 5 is a functional block diagram of a partial discharge monitoring unit (Partial Discharge Monitoring Unit, PDMU) according to an embodiment of the present invention.

圖6是本發明之另一實施例的局部放電監測單元功能方塊示意圖。6 is a functional block diagram of a partial discharge monitoring unit according to another embodiment of the present invention.

11L、11R:電流感測器11L, 11R: Current sensor

12L、12R:接地環12L, 12R: grounding ring

122:外殼122: Shell

13:局部放電監測單元13: Partial discharge monitoring unit

134:差動器134: Differential

15L、15R:接地引線15L, 15R: Ground lead

30:直線接頭30: Straight Connector

30L、30R:肩部30L, 30R: Shoulder

30S:外半導電層30S: Outer semiconducting layer

31L、31R:電纜線31L, 31R: cable

311L、311R:內層纜線311L, 311R: inner cable

312L、312R:外皮312L, 312R: outer skin

32:電纜跨接遮蔽線32: Cable jumper shield wire

32L、32R:電纜遮蔽層32L, 32R: Cable shielding layer

33:壓接端子33: Crimp terminal

Claims (11)

一種電纜接頭局部放電信號的線上量測系統,適用於量測一直線接頭內部和外部發生的局部放電,其中該直線接頭用以包覆兩電纜線的壓接處,並且具有兩肩部及一外半導電層,每一該電纜線具有一電纜遮蔽層及一內層纜線,該內層纜線包括一中心導體,該電纜遮蔽層包覆於該內層纜線之外並與該中心導體電性絕緣,該系統包括: 兩電流感測器,具有相同極性,並分別裝設於該直線接頭的該兩肩部,當該直線接頭發生局部放電時,該兩電流感測器產生兩感測信號; 至少一接地環,設置於該兩電流感測器之間,並且可導電的接觸於該直線接頭的該外半導電層,其中每一該電纜遮蔽層從該兩電流感測器之外部跨越並且與該接地環電性連接,每一該內層纜線插入該直線接頭並穿過該兩電流感測器之其一的內側;以及 一監測單元,電性連接該兩電流感測器,用以對該兩感測信號執行一信號處理流程。An online measurement system for partial discharge signals of cable joints, which is suitable for measuring partial discharges occurring inside and outside a straight joint, wherein the straight joint is used to cover the crimping place of two cables, and has two shoulders and an outer Semi-conductive layer, each of the cable has a cable shielding layer and an inner layer cable, the inner layer cable includes a central conductor, the cable shielding layer is wrapped outside the inner layer cable and is connected with the central conductor Electrically insulating, the system includes: Two current sensors, with the same polarity, are respectively installed on the two shoulders of the linear connector, when partial discharge occurs in the linear connector, the two current sensors generate two sensing signals; at least one ground ring disposed between the two current sensors and conductively contacting the outer semiconducting layer of the straight connector, wherein each of the cable shielding layers spans from the outside of the two current sensors and electrically connected to the ground ring, each of the inner layer cables is inserted into the straight connector and passes through the inner side of one of the two current sensors; and A monitoring unit is electrically connected to the two current sensors for performing a signal processing process on the two sensing signals. 如申請專利範圍第1項所述的電纜接頭局部放電信號的線上量測系統,其中該兩電纜線各自的該電纜遮蔽層從其外部被剝離,被剝離的該兩電纜遮蔽層接合成一電纜跨接遮蔽線,該電纜跨接遮蔽線從該兩電流感測器之外部跨越並且與該接地環電性連接。The on-line measurement system for partial discharge signals of cable joints as described in claim 1, wherein the respective cable shielding layers of the two cables are stripped from the outside, and the stripped two cable shielding layers are combined into a cable A jumper shield wire, the cable jumper shield wire spans from the outside of the two current sensors and is electrically connected with the ground ring. 如申請專利範圍第1項所述的電纜接頭局部放電信號的線上量測系統,其中該接地環的數量為一個,並包括一單一接地引線連接於該接地環與該電纜跨接遮蔽線之間。The on-line measurement system for partial discharge signals of cable joints as described in claim 1, wherein the number of the grounding ring is one, and includes a single grounding lead connected between the grounding ring and the cable jumper shielding wire . 如申請專利範圍第1項所述的電纜接頭局部放電信號的線上量測系統,其中該接地環的數量為二個,該兩接地環分別裝設於該直線接頭的該兩肩部。The on-line measurement system for partial discharge signals of cable joints as described in claim 1, wherein the number of the grounding rings is two, and the two grounding rings are respectively installed on the two shoulders of the straight joint. 如申請專利範圍第4項所述的電纜接頭局部放電信號的線上量測系統,更包括兩接地引線,其中每一該接地引線連接於該兩接地環之其一與該電纜跨接遮蔽線之間。The on-line measurement system for partial discharge signals of cable joints as described in item 4 of the patent application scope, further comprising two grounding leads, wherein each of the grounding leads is connected to one of the two grounding rings and the cable jumper shielding wire between. 如申請專利範圍第4項所述的電纜接頭局部放電信號的線上量測系統,其中每一該接地環包括兩半圓環形導電片,每一該半圓環形導電片具有一接地孔。The on-line measurement system for partial discharge signals of cable joints as described in claim 4, wherein each of the grounding rings includes two semi-circular conductive sheets, and each of the semi-circular conductive sheets has a grounding hole. 如申請專利範圍第6項所述的電纜接頭局部放電信號的線上量測系統,其中每一該接地引線具有一端綁在該半圓環形導電片之其一的該接地孔,另一端與該電纜跨接遮蔽線壓接。The on-line measurement system for partial discharge signals of cable joints as described in claim 6, wherein each of the grounding leads has the grounding hole with one end tied to one of the semi-circular conductive sheets, and the other end connected across the cable Shielded wire crimp. 如申請專利範圍第1項所述的電纜接頭局部放電信號的線上量測系統,其中該監測單元包括二振盪電路、二突波保護元件、一第一多工器、該差動器、一放大器、一絕對值保持電路、一峰值保持電路、一類比數位轉換器及一微控制器,該兩振盪電路分別電性連接於該兩電流感測器,該兩突波保護元件分別電性連接於該兩振盪電路並且皆與該第一多工器電性連接,該第一多工器、該差動器及該放大器依序電性連接,其特徵在於,該絕對值保持電路連接於該放大器與該峰值保持電路之間,該峰值保持電路電性連接於該絕對值保持電路與該類比數位轉換器之間。The on-line measurement system for partial discharge signals of cable joints as described in claim 1, wherein the monitoring unit comprises two oscillator circuits, two surge protection elements, a first multiplexer, the differential, and an amplifier , an absolute value hold circuit, a peak hold circuit, an analog digital converter and a microcontroller, the two oscillation circuits are respectively electrically connected to the two current sensors, and the two surge protection elements are electrically connected to the The two oscillator circuits are both electrically connected to the first multiplexer, the first multiplexer, the differentiator and the amplifier are electrically connected in sequence, characterized in that the absolute value holding circuit is connected to the amplifier and the peak hold circuit, the peak hold circuit is electrically connected between the absolute value hold circuit and the analog-to-digital converter. 如申請專利範圍第8項所述的電纜接頭局部放電信號的線上量測系統,其中該監測單元包括一加法器及一第二多工器,其中該加法器與該差動器形成一並聯結構,該並聯結構電性連接於該第一多工器及該第二多工器之間,該第二多工器電性連接於該並聯結構與該放大器之間。The online measuring system for partial discharge signals of cable joints as described in claim 8, wherein the monitoring unit comprises an adder and a second multiplexer, wherein the adder and the differential form a parallel structure , the parallel structure is electrically connected between the first multiplexer and the second multiplexer, and the second multiplexer is electrically connected between the parallel structure and the amplifier. 如申請專利範圍第1項所述的電纜接頭局部放電信號的線上量測系統,其中每一該電流感測器係由兩半圓環形感測元件組合而成。The on-line measurement system for partial discharge signals of cable joints as described in claim 1, wherein each of the current sensors is composed of two semi-circular ring-shaped sensing elements. 如申請專利範圍第1項所述的電纜接頭局部放電信號的線上量測系統,其中每一該電流感測器係為一完整環形感測元件。The on-line measurement system for partial discharge signals of cable joints as described in claim 1, wherein each of the current sensors is a complete ring-shaped sensing element.
TW109117308A 2020-05-25 2020-05-25 On-line measuring system for partial discharges signals of cable joints TWI737309B (en)

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CA2508428A1 (en) * 2005-05-20 2006-11-20 Hydro-Quebec Detection, locating and interpretation of partial discharge
CN101782622A (en) * 2009-11-25 2010-07-21 西安博源电气有限公司 Partial discharge on-line monitoring device of power cable and joint
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