WO2019194754A1 - Boîte de connexions comprenant un diviseur de tension de type isolant intégré et un capteur de décharge partielle inductif - Google Patents

Boîte de connexions comprenant un diviseur de tension de type isolant intégré et un capteur de décharge partielle inductif Download PDF

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Publication number
WO2019194754A1
WO2019194754A1 PCT/TR2018/050142 TR2018050142W WO2019194754A1 WO 2019194754 A1 WO2019194754 A1 WO 2019194754A1 TR 2018050142 W TR2018050142 W TR 2018050142W WO 2019194754 A1 WO2019194754 A1 WO 2019194754A1
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WO
WIPO (PCT)
Prior art keywords
partial discharge
link box
cable
provides
box
Prior art date
Application number
PCT/TR2018/050142
Other languages
English (en)
Inventor
Mustafa Sadettin ERDENİZ
Original Assignee
Em Elektri̇k Malzemeleri̇ Yükleni̇m Sanayi̇ Ti̇caret Anoni̇m Şi̇rketi̇
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Em Elektri̇k Malzemeleri̇ Yükleni̇m Sanayi̇ Ti̇caret Anoni̇m Şi̇rketi̇ filed Critical Em Elektri̇k Malzemeleri̇ Yükleni̇m Sanayi̇ Ti̇caret Anoni̇m Şi̇rketi̇
Priority to PCT/TR2018/050142 priority Critical patent/WO2019194754A1/fr
Publication of WO2019194754A1 publication Critical patent/WO2019194754A1/fr

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Classifications

    • 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
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • H02G15/068—Cable terminating boxes, frames or other structures with devices for relieving electrical stress connected to the cable shield only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress
    • H02G15/105—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress connected to the cable shield only

Definitions

  • the invention especially relates to a link box with built-in insulator type voltage divider and inductive partial discharge sensor for use in high voltage cable systems.
  • High voltage cables are always designed with metallic sheath to controls the electric field stress in the cable insulation and also providing return path for fault current.
  • AC voltages may be induced on metallic sheath due to electromagnetic coupling between core and the metallic sheath.
  • special bonding and grounding methods such as single point bonding and cross bonding are used in high voltage cable systems.
  • Link boxes are the metallic enclosures in which bonding and grounding of sheathes of high voltage cable joints or terminations made through removable links. Link boxes also may contain sheath voltage limiters to limit lightning or switching overvoltage’s of cable system. Link boxes are installed close to high voltage cable joints or terminations and may be installed in places such as underground manholes, aboveground pedestals or tunnel walls and etc.
  • Diagnostic testing of new or service-aged installed high voltage power cable systems which include cable, joints and terminations, using partial discharge detection, measurement and locating, has a long history. After-laying partial discharge testing on newly installed cable system is an efficient method to find defects in accessories, e.g. improper positioning, cuts or scratches, contaminations etc. Partial discharge testing on service-aged cable systems is a useful indicator of insulation degradation. Partial discharge testing may be carried out on-line (at normal service voltage) or off-line (by an external voltage source). Moreover, continuous on-line monitoring of cable systems has received more attention in recent years. Having been encountered as a result of the technical researches, Application No.
  • WO 2016190823 A1 relates to a link box with built-in partial discharge sensor for partial discharge measurement in high voltage cable joints and terminations.
  • High Frequency Current Transformers (HFCTs) inside link boxes is a common method to pick up partial discharge from high voltage cable screen.
  • HFCT sensors consist of a wound toroidal ferromagnetic core that is placed around the conductor to inductively measure the magnetic field from the partial discharge current pulses.
  • HFCT sensors Commercially available and appropriate for mounting inside link boxes have many disadvantages including occupying a lot of space inside link boxes which will affect lightning performance of link boxes, installation difficulties around bonding cables or copper link bars (especially non-split types), need to extra accessories for installation and high cost.
  • the invention configured by being inspired by the current conditions, aims to solve the above mentioned drawbacks.
  • Present invention introduces an all-in-one solution for above mentioned problems of partial discharge measurement in link boxes.
  • the main object of the present invention is to overcome these problems, an insulator type inductive partial discharge sensor has been developed to be installed inside link boxes.
  • This insulator can be used instead of support insulators inside link boxes.
  • New product has some advantages rather than other HFTC’s mounting inside link boxes including compact size, no effect on lightning performance of link box, no need to extra accessories for mounting and being low cost.
  • This sensor also has been equipped with a voltage divider inside for measurement of induced voltages in bonding system of high voltage cable systems.
  • This signal can be also used to provide synchronization signals for partial discharge measuring devices. Also, it can be used for counting number of lightning impulses passing through sheath voltage limiters inside link boxes so condition monitoring of SVL is possible.
  • Two BNC outputs are available on the base of insulator which is voltage divider output and partial discharge sensor output. So, signals are ready-to-use for measuring systems, counters or monitoring systems.
  • the present invention is a link box which provides bonding and grounding of sheathes of cable joints or cable terminations and comprising partial discharge sensors and voltage dividers provide to pick up partial discharge pulses, measurement of induced voltages in link box, counting number of lightning impulses passing through sheath voltage limiters and comprise top metal fittings which are used to connect to energized parts of link box, bottom metal fittings are connected to ground body of link box, primary windings are connected to link box energized components and other components of the partial discharge sensor and voltage divider, secondary windings are used output port for partial discharge measurement, capacitors provide a capacitive voltage dividing circuit, top connectors provide an appropriate connection point for measuring/monitoring devices and bottom connectors provide an appropriate connection point for measuring/monitoring devices.
  • Fig. 1 shows all components of the present invention.
  • Fig. 2 shows top overall view insulator type partial discharge sensor and voltage divider.
  • Fig. 3 shows top schematic view insulator type partial discharge sensor and voltage divider.
  • Fig. 4 shows schematic view of a high voltage cable system during offline and online partial discharge test.
  • Fig. 5 shows arrangement of current invention when it used for online monitoring. Description of the Part References
  • the invention relates to link box (A) with built-in insulator type voltage divider and inductive partial discharge sensor for use in high voltage cable systems.
  • Link box (A) includes a stainless- steel enclosure body (1 ) and stainless-steel enclosure cover (2).
  • Enclosure body (1 ) can be seen as a base frame for mounting internal parts and protection of internal parts against environmental conditions.
  • Bonding cables (4) are used to connect metallic sheath of high voltage cable joints (26) or cable termination (25) to link box (A). Then cross bonding of cable sheathes made by dis-connectable link bars (14) inside link box (A).
  • Earthing cable (5) is connected to earthing busbar inside the link box (A) and then it’s ready to be connected to earthing electrode outside of the link box (A). Sealed penetration of bonding cables (4) (coaxial) and earthing cable (5) into enclosure body (1 ) made by cable glands (3). All energized parts of are isolated from ground via support insulators (10).
  • Partial discharge detection in current invention is made by insulator type inductive voltage divider and partial discharge sensor (9) (ITPDS).
  • IPDS insulator type inductive voltage divider and partial discharge sensor
  • connection of voltage divider and partial discharge sensor (9) to link box (A) components is made via top metal fitting (23) and bottom metal fittings (24).
  • Top metal fitting (23) is used to connect to energized parts of link box (A).
  • Bottom metal fiftting (24) was connected to ground i.e. body of link box (A) (enclosure cover (2)).
  • Insulating body (22) made from glass fiber reinforced polyurethane material provides an insulating environment for electrical components inside of voltage divider and partial discharge sensor (9). Also insulating body (22) provides a reliable mechanical support for all encapsulated components.
  • Fig.3 shows schematic view of internal structure of voltage divider and partial discharge sensor (9).
  • Primary winding (16) of voltage divider and partial discharge sensor (9) wound on ferromagnetic core (15) provide a pass for passing transient current pulses (partial discharge pulses).
  • transient current pulses partial discharge pulses
  • one side of primary winding (16) connected to link box (A) energized components and other side connected to other components of voltage divider and partial discharge sensor (9).
  • Soft ferromagnetic core (15) is used for effective coupling between primary winding (16) and secondary winding (17).
  • High permeability of ferromagnetic core (15) provides an ideal pass for transient partial discharge pulses.
  • the induced voltage in the secondary winding (17) is proportional to the rate of change of current in the primary winding (16). So, terminals secondary winding (17) are used as output port for partial discharge measurement.
  • Top connector (20) has been used to provide an appropriate connection point for measuring/monitoring devices.
  • High voltage capacitor (18) (HV) and low voltage capacitor (19) (LV) connected in series provides a capacitive voltage divider. Midpoint of these high voltage capacitor (18) and low voltage capacitor (19) and ground provides output of capacitive voltage divider.
  • Bottom connector (21) has been used to provide an appropriate connection point for measuring/monitoring devices.
  • Partial discharge output top connector (20) and voltage output of bottom connector (21 ) of voltage divider and partial discharge sensor (9) are transmitted to additional housing (6) via signal cables (1 1 ).
  • offline or online partial discharge testing in present invention is possible just only by opening the housing cover (7) and connecting test device to protection box (8).
  • the invention relates to a link box (A) which provides bonding and grounding of sheathes of cable joints (26) or cable terminations (25) and comprises,
  • At least an earthing cable (5) is connected to earthing busbar inside the link box (A) and earthing electrode outside of the link box (A),
  • At least a voltage divider and partial discharge sensor (9) provides to pick up partial discharge pulses, measurement of induced voltages in link box (A), counting number of lightning impulses passing through sheath voltage limiters and comprises
  • o high voltage capacitor (18) provide a capacitive voltage dividing circuit
  • o low voltage capacitor (19) provide a capacitive voltage dividing circuit
  • o at least a top connector (20) provides an appropriate connection point for measuring/monitoring devices
  • o at least a bottom connector (21 ) provides an appropriate connection point for measuring/monitoring devices
  • At least an additional housing (6) is located on the enclosure cover (2) which pulses of partial discharge signals are transmitted using signal cables (1 1 ) connecting the voltage divider and partial discharge sensor (9) to protection box (8) and provides carrying out of partial discharge measurement during partial discharge test just only by opening at least a housing cover (7) without opening enclosure cover (2),
  • a protection box (8) located in the additional housing (6) intended for connecting partial discharge test device and also provides protection of test circuit using spark gaps inside,
  • the housing cover (7) provides a sealed housing for the protection box (8)
  • At least a sensor cable gland (12) makes sealed penetration of signal cables (1 1 ) into the enclosure body (1 ),

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

Abstract

L'invention concerne un boîtier de connexions (A) qui assure la liaison et la mise à la terre de gaines de jonctions de câbles (26) ou d'extrémités de câbles (25), et qui comprend un diviseur de tension et un capteur de décharge partielle (9) permettant de capter des impulsions de décharge partielle, de mesurer des tensions provoquées dans la boîte de connexions (A), de compter le nombre de tensions de choc de foudre passant par des limiteurs de tension de gaine, et qui comprend un accessoire en métal supérieur (23) destiné à être connecté à des parties excitées de la boîte de connexions (A), des accessoires en métal inférieurs (24) qui ont été connectés au corps de masse de la boîte de connexions (A), un enroulement primaire (16) connecté à des composants excités de la boîte de connexions (A) et à d'autres composants du diviseur de tension et du capteur de décharge partielle (9), un enroulement secondaire (17) qui est utilisé pour un orifice de sortie en vue d'une mesure de décharge partielle, un condensateur haute tension (18) et un condensateur basse tension (19) qui fournissent un circuit de division de tension capacitif, un connecteur supérieur (20) qui assure un point de connexion approprié pour des dispositifs de mesure/surveillance et un connecteur inférieur (21) qui assure un point de connexion approprié pour des dispositifs de mesure/surveillance.
PCT/TR2018/050142 2018-04-04 2018-04-04 Boîte de connexions comprenant un diviseur de tension de type isolant intégré et un capteur de décharge partielle inductif WO2019194754A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/TR2018/050142 WO2019194754A1 (fr) 2018-04-04 2018-04-04 Boîte de connexions comprenant un diviseur de tension de type isolant intégré et un capteur de décharge partielle inductif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2018/050142 WO2019194754A1 (fr) 2018-04-04 2018-04-04 Boîte de connexions comprenant un diviseur de tension de type isolant intégré et un capteur de décharge partielle inductif

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111431137A (zh) * 2020-04-20 2020-07-17 深圳供电局有限公司 电缆中间接头
CN111624453A (zh) * 2020-05-14 2020-09-04 广东电网有限责任公司 一种配电电缆局部放电离线测试装置
CN112595937A (zh) * 2020-11-20 2021-04-02 沈阳达能电安全高新产业技术研究院有限公司 一种基于平衡法的电缆局部放电测量装置
US11183828B1 (en) 2020-06-12 2021-11-23 hvGrid-tech Inc. Device with health monitoring
WO2022075928A1 (fr) * 2020-10-07 2022-04-14 Em Elektri̇k Malzemeleri̇ Yükleni̇m Sanayi̇ Ti̇caret Anoni̇m Şi̇rketi̇ Boîte de connexions intelligente munie d'un système d'avertissement précoce destiné à la surveillance en ligne d'un système de raccordement de gaines et d'accessoires de câble haute tension
EP4033262A4 (fr) * 2020-11-26 2022-08-17 State Grid Shanghai Municipal Electric Power Company Dispositif de détection de décharge partielle et procédé fondé sur un boîtier de connexion transversale

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WO2018006876A1 (fr) * 2016-07-08 2018-01-11 国网上海市电力公司 Inductance mutuelle de tension capacitive pour système de surveillance de surtension transitoire

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111431137A (zh) * 2020-04-20 2020-07-17 深圳供电局有限公司 电缆中间接头
CN111624453A (zh) * 2020-05-14 2020-09-04 广东电网有限责任公司 一种配电电缆局部放电离线测试装置
CN111624453B (zh) * 2020-05-14 2023-01-24 广东电网有限责任公司 一种配电电缆局部放电离线测试装置
US11183828B1 (en) 2020-06-12 2021-11-23 hvGrid-tech Inc. Device with health monitoring
WO2022075928A1 (fr) * 2020-10-07 2022-04-14 Em Elektri̇k Malzemeleri̇ Yükleni̇m Sanayi̇ Ti̇caret Anoni̇m Şi̇rketi̇ Boîte de connexions intelligente munie d'un système d'avertissement précoce destiné à la surveillance en ligne d'un système de raccordement de gaines et d'accessoires de câble haute tension
GB2607143A (en) * 2020-10-07 2022-11-30 Em Elektrik Malzemeleri Yuklenim Sanayi Ticaret Anonim Sirketi Intelligent link box with early warning system for online monitoring of sheath bonding system and high voltage cable accessories
CN112595937A (zh) * 2020-11-20 2021-04-02 沈阳达能电安全高新产业技术研究院有限公司 一种基于平衡法的电缆局部放电测量装置
EP4033262A4 (fr) * 2020-11-26 2022-08-17 State Grid Shanghai Municipal Electric Power Company Dispositif de détection de décharge partielle et procédé fondé sur un boîtier de connexion transversale

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