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WO2018174711A1 - Système de mesure pour surveiller un système isolé au gaz - Google Patents

Système de mesure pour surveiller un système isolé au gaz Download PDF

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Publication number
WO2018174711A1
WO2018174711A1 PCT/NL2018/050174 NL2018050174W WO2018174711A1 WO 2018174711 A1 WO2018174711 A1 WO 2018174711A1 NL 2018050174 W NL2018050174 W NL 2018050174W WO 2018174711 A1 WO2018174711 A1 WO 2018174711A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement system
current sensor
gis
current
conducting element
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/NL2018/050174
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English (en)
Inventor
Armando Rodrigo Mor
Luis Carlos CASTRO HEREDIA
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.)
Technische Universiteit Delft
Original Assignee
Technische Universiteit Delft
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 Technische Universiteit Delft filed Critical Technische Universiteit Delft
Publication of WO2018174711A1 publication Critical patent/WO2018174711A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01R31/1227—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
    • G01R31/1254—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 gas-insulated power appliances or vacuum gaps
    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • 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

Definitions

  • the present invention relates to a measurement system for monitoring a gas insulated system (GIS), the gas insulated system comprising at least two GIS segments, each of the at least two GIS segments comprising a central conductor and an outer conductor coaxially positioned around the central conductor, and an insulating spacer positioned between two adjacent outer conductors of the at least two GIS segments.
  • GIS gas insulated system
  • the international patent publication WO2007/097491 discloses a system for partial discharge (PD) detection of gas insulated switchgear, using an ultra-high frequency (UHF) antenna installed in a recess formed in an insulating spacer of the switchgear.
  • UHF ultra-high frequency
  • RF radiofrequency
  • British patent publication GB-A-2444613 describes a partial discharge detection device for gas-insulated equipment in which a high voltage conductor is supported by an insulator inside hermitically sealed and gas-filled metal containers.
  • US patent publication US2007/1 15008 describes a pulse current sensor (not a GIS system) comprising an entrance coaxial conductor and an exit coaxial conductor that are interconnected by a continuous inner conductor.
  • the outer conductors are interrupted and are interconnected by a sensing resistor with a substantially constant resistance.
  • US patent publication US-B-7,741 ,853 describes a ground-fault sensor that has a plurality of conductors each disposed one inside of another except for an outer conductor and a field sensor configured to sense an electric field, a magnetic field, or both.
  • the field sensor is disposed adjacent the outer conductor.
  • US patent publication US2015/204936 describes a partial discharge sensor system similar to the one disclosed in GB-A-2444613, with a plurality of bolts connecting flanges formed on the outer tubes.
  • a bowtie antenna is positioned inside a metal casing in a direction orthogonal to a circumferential direction of the flanges, to allow reception of a signal caused by a partial discharge.
  • British patent publication GB-A-2474125 describes a partial discharge detector system similar to the one disclosed in GB-A-2444613, with a plurality of bolts connecting flanges formed on the outer tubes.
  • a slot antenna is positioned in contact with or near to an insulating spacer between two flanges.
  • the present invention seeks to provide an improved measurement system for detecting partial discharges in a gas insulated system.
  • a measurement system as defined above is provided, the gas insulated system further comprising an electrical conducting element in electrical connection with the two adjacent outer cylindrical conductors, and the measurement system comprising a current sensor in measuring relationship with the at least one electrical conducting element.
  • This measurement system allows to measure a current caused by a partial discharge event in one of the at least two GIS segments. This would furthermore allow to evaluate the pulse charge by means of partial discharge charge evaluation techniques.
  • Fig. 1 shows a schematic view of a gas insulated system having multiple segments
  • Fig. 2 shows a partial cross sectional view of a first embodiment of the present invention measurement system
  • Fig. 3 shows a partial cross sectional view of a second embodiment of the present invention measurement system
  • Fig. 4 shows a partial cross sectional view of a third embodiment of the present invention measurement system
  • Fig. 5 shows a schematic view of a measurement system according to an embodiment of the present invention.
  • Fig. 6 shows a partial cross sectional view of an even further embodiment of the present invention measurement system.
  • the present invention relates to a measurement system 1 for gas insulated systems (GIS) or Gas insulated lines (GIL) as employed in distribution of electrical energy, e.g. as an underground cable.
  • GIS gas insulated systems
  • GIL Gas insulated lines
  • the measurement system 1 is particularly suited for detecting a partial discharge event in a GIS or GIL (which in the description hereinafter will be indicated in general by the term 'GIS').
  • Fig. 1 shows a schematic view of a gas insulated system having multiple GIS segments 2.
  • Each GIS segment 2 comprises an inner or central conductor 3 and an outer conductor 4.
  • Two adjacent GIS segments 2 are connected to each other by means of an insulating spacer 5 and a plurality of fixing rods (or bolts) 8.
  • the space between the central conductor 3 and outer conductor 4 are filled with an insulating gas in operation, allowing transport of high voltage energy through the GIS segments 2.
  • the arrangement of central conductor 3 and outer conductor 4 can be fully symmetrical, and in case of a cylindrical outer conductor 4 this results in a coaxial arrangement. Alternatively, several central conductors 3 may be present in an arrangement allowing maximum spacing from the outer conductor 4.
  • a complete GIS installation is a combination of various GIS segments 2, in the form of GIS sections, such as non-switching compartments, gas insulated lines, and elements like bushings, spacers, circuit breakers, disconnector switches, earthing switches, voltage and current measuring transformers.
  • GIS segment 2 an insulation defect may occur during operation, which usually results in a partial discharge (PD), indicated by reference numeral 10 in Fig. 1 .
  • PD partial discharge
  • resulting PD current pulses 1 1 a, 1 1 b propagate along the GIS as the GIS behaves as a transmission line for the (high frequency content) PD pulses.
  • UHF antennas are used to detect electromagnetic waves created by the PD pulse and propagating along the GIS segments 2. This necessitates placement of openings or dielectric windows in a GIS segment 2 in which antennas can be placed to pick up the radiated signal produced by a PD event.
  • PD induced current pulses are measured in the outer conductors 4 of a GIS installation.
  • This is possible as the arrangement of a GIS segment 2 having a central (or inner) conductor 3 and an outer conductor 4, i.e. a coaxial structure, acts as receiving electrodes of current pulses 1 1 a, 1 1 b induced by a PD event 10 within the GIS segment 2.
  • the insulating spacers 5 which are used to connect two GIS segments 2 together, would interrupt the coaxial structure, and the PD current pulses would flow through the fixing rods 8 connecting two end parts of two adjacent outer conductors 4.
  • the current which would be homogeneously distributed over the outer conductor 4 is split into several current paths, i.e. over the plurality of (metallic) fixing rods 8 extending through the insulating spacer 5.
  • the present invention embodiments relate to a measurement system 1 for monitoring a gas insulated system (e.g. for detecting partial discharges in the gas insulated system), the gas insulated system comprising at least two GIS segments 2, each of the at least two GIS segments 2 comprising a central conductor 3 and an outer conductor 4 coaxially positioned around the central conductor 3, an insulating spacer 5 positioned between two adjacent outer conductors 4 of the at least two GIS segments 2, and an electrical conducting element 6 in electrical connection with the two adjacent outer cylindrical conductors 4.
  • the measurement system 1 comprises a current sensor 7 in measuring relationship with the at least one electrical conducting element 6.
  • the measuring relationship of the current sensor 7 with the at least one electrical conducting element 6 may be implemented using different techniques and structures, as will be explained with reference to the embodiments as shown in Fig. 2-4.
  • Fig. 2 shows a partial cross sectional view of a first embodiment of the present invention measurement system, wherein the current sensor 7 is integrated into the insulating spacer 5.
  • the current sensor 7 e.g. comprises a casing 20 with an insulating inner sleeve 21 , in combination encasing a ferrite core and sensor coil.
  • the at least one electrical conducting element 6 is one of the plurality of fixing rods 8, mechanically connecting adjacent end parts 9 of the two adjacent outer conductors 4 and extending through the insulating spacer 5.
  • the end part 9 comprises a flange 9 extending radially from the respective outer conductor 4. This allows to easily and effectively connect the two outer conductors 4 in a mechanically strong manner, e.g. by providing holes in the flanges 9 and spacer 5, and fastening the fixing rods 8 using a nut 15 and ring 16.
  • an insulating sleeve 17 may be provided in the hole in flange 9 serving dielectric purposes as well as mechanical purposes, e.g. to allow easy insertion of the fixing rods 8. If the plurality of fixing rods 8 is provided evenly distributed over the circumference of the end part 9, a proper sealing and structural integrity of two adjacent GIS segments 2 is ensured.
  • Fig. 3 shows a partial cross sectional view of a second embodiment of the present invention measurement system, wherein the insulating spacer 5 is not modified to include the current sensor 7.
  • the at least one electrical conducting element 6 is one of the plurality of fixing rods 8.
  • the current sensor 7 is provided as a coaxial arrangement around one of the fixing rods 8.
  • the flow of the current originating from the partial discharge event will follow the entire length of the (conducting) fixing rod 8 because of the insulating sleeve 17, in order to have the total current flow through the core of the current sensor 7.
  • the width of the current sensor 7 is chosen to be as low as possible.
  • the current coming from one outer conductor 4 flows through the (metallic) fixing rod 8 and the current sensor 7, and passes to the other outer conductor 4 via the housing 20 of the current sensor 7.
  • the partial discharge induced current flows through an inner conductor (fixing rod 8) and returns through an outer conductor (housing 20 of current sensor 7), this configuration is also dubbed a coaxial arrangement.
  • the current sensor 7 comprises a magnetic core surrounding the at least one electrical conducting element 6, a coil being wound around the magnetic (e.g. ferrite) core.
  • the current sensor 7 may be a high frequency current transformer (HFCT), wherein the at least one conducting element 6 can be seen as the primary winding, and the coil around the magnetic core as the secondary winding.
  • the current sensor 7 comprises a magnetic field sensor positioned in vicinity of the at least one electrical conducting element 6, e.g. attached to an outer surface of the insulating spacer 5. In high voltage systems, it is possible to implement this embodiment specifically using a Rogowsky coil.
  • the current sensor 7 is in a measuring relationship with the at least one electrical conducting element 6, and transforms a current flowing in the at least one electrical conducting element into a measurement voltage across terminals of the current sensor 7.
  • Fig. 4 shows a partial cross sectional view of an example of a third embodiment of the present invention measurement system, wherein the at least one electrical conducting element 6 is an external conductor 6 connecting adjacent end parts 9 of the two adjacent outer conductors 4, and is positioned external to the insulating spacer 5.
  • the external conductor 6 may be connected in electrical connection to the end parts 9 using the nut 15 to secure the external conductor 6 to the surface of the end part 9.
  • the fixing rod 8 is a metallic material bolt, the external conductor 6 shunts the fixing rod 8, and the current induced by a PD pulse normally running through that fixing rod 8, will spread in two separate current paths, still allowing to detect the PD current pulse in the path of the external conductor 6.
  • one of the plurality of fixing rods 8 is an insulating rod, and the external conductor 6 is mechanically connected to the insulating rod (and electrically to the end part 9).
  • the external conductor 6 is mechanically connected to the insulating rod (and electrically to the end part 9).
  • the external conductor 6 may be selected from the group comprising a flexible cable (e.g. a braided wire, a Litze wire, etc.), a metal strip (in the form of a jumper, clip, etc.), or a stack of metal strips.
  • a flexible cable e.g. a braided wire, a Litze wire, etc.
  • a metal strip in the form of a jumper, clip, etc.
  • a stack of metal strips e.g. a stack of metal strips.
  • the part of the current flowing through the at least one electrical conducting element 6 may be enhanced by properly selecting the material of the at least one electrical conducting element 6, as well as the material of the remaining ones of the plurality of fixing rods 8.
  • the fixing rod 8 acting as the at least one electrical conducting element 6 may be made of a better conducting material, such as copper.
  • the current sensor 7 it is possible to have the current sensor 7 to be associated with e.g. only one of the fixing rods 8, even though in that case only a part of the PD induced current can be measured.
  • the PD induced current is channelled to only one or less than all fixing rods 8. In a specific embodiment, this is implemented by use of non-conductive nuts 15 and rings 16 for one or more of the fixing rods 8, thus increasing current through specific ones of fixing rods 8 acting as the at least one electrical conducting element 6 operatively coupled to current sensor 7. It will be apparent that also further isolating elements may be used to channel a possible PD induced current away from one or more of the fixing rods 8.
  • accuracy, sensitivity and/or interference resistance of the measurement set-up is improved using multiple current sensors 7 associated with a similar number of fixing rods 8 in electrical connection with adjacent outer conductors 4 (or the end parts 9 thereof).
  • Fig. 6 shows a partial cross sectional view of yet a further embodiment of the present invention, wherein the outer conductors 4 are connected at their respective end parts 9 using an alternative embodiment of the spacer 5 (and fixing rods 8).
  • the spacer 5 comprises a main spacer body 5a of isolating material, fixing the central conductor 3 in position with respect to the outer conductors 4.
  • the main spacer body 5a in this embodiment does not extend radially all the way up to the end of flanges 9 of the outer conductors, but to a more limited radius, e.g. about equal to the outer radius of the outer conductors 4.
  • a secondary spacer body 5b is used, which radially extends from the spacer main body 5a, having through holes for installing the fixing bolts 8. This allows for an easier manufacture of the secondary spacer body 5b with the through holes (in the form of a single material ring shaped body).
  • the material of the secondary spacer body 5b may be the same as the spacer main body 5a, but alternatively may be made of a conducting material.
  • the present invention embodiments can still be implemented if an isolating layer 5c is provided, which as indicated in the embodiment of Fig. 6 isolates the conductive secondary spacer body 5b from the flange 9 of one (or both) of the outer conductors 4. Especially the embodiment described above with reference to Fig. 3 and 4 can still be easily applied.
  • the isolating layer 5c can be implemented in various embodiments, e.g. as a disc shaped ring of insulating material (plastic, paper, etc.).
  • the radial dimensions can be similar to the radial dimension of the secondary spacer body 5b, or alternatively extend further inward to (partly) overlap the spacer main body 5a. It is noted that the insulation properties of the isolating layer 5c only need to be considered in relation to the small currents induced by the PD's and the relatively low resistance of the at least one electrical conducting element 6, and as a result the isolating layer 5c only needs to be relatively thin.
  • the isolating layer 5c may even be implemented as a non-conductive (or isolating) coating of the surface of the flange 9 of the outer conductor 4 and/or a non-conductive (or isolating) coating of the surface of the secondary spacer body 5b.
  • Fig. 5 shows a schematic view of a measurement system according to an embodiment of the present invention, wherein one of the above described arrangements of current sensor 7 is applied.
  • the measurement system 1 further comprises an evaluation unit 12 connected to the current sensor 7, the evaluation unit 12 being arranged to execute a charge evaluation of detected current pulses.
  • a charge evaluation of the detected current pulse can to a predetermined level of uncertainty result in a reliable and robust detection of a partial discharge (or in a further alternative of an insulation defect) in one of the GIS segments 2. It is noted that normally, charge evaluation is not used for detection, but to assess the severity of the defect causing the partial discharge. In the standards, the maximum amount of charge is specified (normally in picoCoulomb (pC)) that is allowed in factory tests.
  • pC picoCoulomb
  • the present invention measurement system has the advantage that it is possible to calculate a charge, as a result of which it is possible to compare on-line field measurements with laboratory tests.
  • the current sensor 7 and evaluation unit 12 circuitry have appropriate characteristics, such as a lower cut-off frequency of30kHz and an upper cut-off frequency above 60 MHz. In short a compromise will be selected with a trade-off between sensitivity and bandwidth.
  • the evaluation unit 12 is further arranged to determine the ratio of measurement current (or charge) through the at least one electrical conducting element 6 and a current (or charge) through the outer conductor 4 caused by a pulse event (such as a partial discharge pulse or an insulation defect). From this ratio, which can be determined by (electromagnetic) simulation, or by calibration, the original pulse shape can be reconstructed and hence a proper charge estimation can be accomplished. Calibration can be implemented using a controlled current injection and measurement. E.g. a PD calibrator may be placed at a location in a GIS segment 2, and connected between the central conductor 3 and outer conductor 4. Note that for such calibration standards may apply, such as IEC60270.
  • a predetermined current of a known charge value is then injected, and the current sensor 7 is used to measure the resulting current at the measurement location, allowing the evaluation unit 12 to calculate the associated charge.
  • the ratio of the measured charge and the injected charge is then the ratio of the charge measured by the current sensor 7 to the total charge flowing in the outer conductor 4. Knowing this ratio of charges, the total charge flowing through the fixing rods 8 and at least one electrical conducting element 6 of the insulating spacer 5, and thus through the outer conductor 4 can be estimated.
  • the measurement system 1 may be applied to measure at the location of an insulating spacer 5 between two GIS segments 2 which are mechanically connected to each other using sixteen rods 8 at a circumference of the associated outer conductors 4. It is noted that the measurement system 1 , and especially the form and type of combination of current sensor 7 and at least one conducting element 6, may be of an influence on how the current pulse 1 1 a, 1 1 b originating from the partial discharge 10 spreads over the outer surface of outer conductors 4 and through each of the rods 8. In this respect, especially the resistance and inductance from the current sensor 7 play a role.
  • the ratio in an exemplary embodiment using sixteen rods 8, and a current sensor 7 in a coaxial relation to one of the rods 8, has been determined using the injection calibration method to be 3%.
  • the at least one conducting element 6 was embodied as a stack of ten copper mutually isolated strips and electrically connected to two adjacent outer conductors 4 at the position of an isolating rod 8, in combination with an HFCT sensor 7, the ratio was determined to be 1 .5% (again using the injection calibration method).
  • the measurement system further comprises at least one additional current sensor 7a connected to the evaluation unit 12, the at least one additional current sensor 7a being associated with an additional insulating spacer 5' between two further GIS segments 2. If current pulses are detected at several spacers 5, 5'it is possible to determine the location of a partial discharge, e.g. by evaluating the polarity of the current pulses. As shown in the embodiment of Fig. 5, a PD will cause a left travelling half pulse 1 1 a and a right travelling half pulse 1 1 b.
  • a PD pulse from a GIS segment 2 outside of all current sensors 7, 7a will have the same polarity.
  • a PD pulse from a GIS segment 2 within all current sensors 7, 7a will cause a different polarity in some of the current sensors 7, 7a, allowing determination of the PD event location.
  • the evaluation unit 12 may be further arranged to detect a position of a partial discharge in one of the GIS segments 2 by measuring timing differences between congruent current pulses as detected by the current sensor 7 and one or more additional sensors 7a.
  • these embodiment would allow even better detection of a partial discharge event in one of the associated GIS segments 2, as the measurements by the current sensor 7 and at least one additional current sensor 7a may be used in a redundant manner.
  • the evaluation unit may be further arranged to detect a faulty GIS segment 2 by matching current pulse measurements from the current sensor 7 and one or more additional sensors 7a.
  • a faulty GIS segment 2 may e.g. be caused by the presence of a leakage current, or a short circuit. In general such events cause currents which are several orders of magnitude larger than a current pulse caused by a PD event. This may be detected and evaluated by the evaluation unit 12. The measured current magnitude in several measurement locations (current sensors 7, 7a) will indicated the location of the faulty GIS segment 2.
  • GIL gas insulated lines

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

Abstract

L'invention concerne un système de mesure permettant de surveiller un système isolé au gaz, le système isolé au gaz comprenant au moins deux segments du SIG (2). Chacun des au moins deux segments du SIG (2) a un conducteur central (3) et un conducteur externe (4) positionné de manière coaxiale autour du conducteur central (3). Un espaceur isolant (5) est positionné entre deux conducteurs externes adjacents (4) des au moins deux segments du SIG (2), et un élément conducteur électrique (6) est en connexion électrique avec les deux conducteurs cylindriques externes adjacents (4). Le système de mesure (1) comprend en outre un capteur de courant (7) en relation de mesure avec le ou les éléments conducteurs électriques (6), qui est par exemple formé par l'une d'une pluralité de tiges de fixation (8) s'étendant à travers l'espaceur (5).
PCT/NL2018/050174 2017-03-20 2018-03-20 Système de mesure pour surveiller un système isolé au gaz Ceased WO2018174711A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2018552A NL2018552B1 (en) 2017-03-20 2017-03-20 Measurement system for monitoring gas insulated system
NL2018552 2017-03-20

Publications (1)

Publication Number Publication Date
WO2018174711A1 true WO2018174711A1 (fr) 2018-09-27

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PCT/NL2018/050174 Ceased WO2018174711A1 (fr) 2017-03-20 2018-03-20 Système de mesure pour surveiller un système isolé au gaz

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NL (1) NL2018552B1 (fr)
WO (1) WO2018174711A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114217189A (zh) * 2021-12-30 2022-03-22 国网江苏省电力有限公司南通供电分公司 一种采用特高频暂态电流测量的gil设备故障定位方法
CN119805310A (zh) * 2025-03-11 2025-04-11 广东电网有限责任公司佛山供电局 一种融合磁场-电流特征的gis母线电接触缺陷诊断方法和相关装置

Citations (7)

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Publication number Priority date Publication date Assignee Title
US20070115008A1 (en) 2005-09-01 2007-05-24 Barth Jon E Pulse current sensor
WO2007097491A1 (fr) 2006-02-22 2007-08-30 Ja Yoon Koo Dispositif de détection de décharge partielle d'un appareil de commutation à isolation gazeuse
GB2444613A (en) 2006-12-04 2008-06-11 Toshiba Kk Partial discharge detector for gas insulated equipment
US7741853B2 (en) 2007-09-28 2010-06-22 Rockwell Automation Technologies, Inc. Differential-mode-current-sensing method and apparatus
GB2474125A (en) 2009-10-02 2011-04-06 Toshiba Kk Partial discharge detector for gas insulated electric apparatus
US20150204936A1 (en) 2012-02-21 2015-07-23 Mitsubishi Electric Corporation Partial discharge sensor
GB2538199A (en) 2014-03-07 2016-11-09 Mitsubishi Electric Corp Partial discharge sensor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070115008A1 (en) 2005-09-01 2007-05-24 Barth Jon E Pulse current sensor
WO2007097491A1 (fr) 2006-02-22 2007-08-30 Ja Yoon Koo Dispositif de détection de décharge partielle d'un appareil de commutation à isolation gazeuse
GB2444613A (en) 2006-12-04 2008-06-11 Toshiba Kk Partial discharge detector for gas insulated equipment
US7741853B2 (en) 2007-09-28 2010-06-22 Rockwell Automation Technologies, Inc. Differential-mode-current-sensing method and apparatus
GB2474125A (en) 2009-10-02 2011-04-06 Toshiba Kk Partial discharge detector for gas insulated electric apparatus
US20150204936A1 (en) 2012-02-21 2015-07-23 Mitsubishi Electric Corporation Partial discharge sensor
GB2538199A (en) 2014-03-07 2016-11-09 Mitsubishi Electric Corp Partial discharge sensor
US20160349303A1 (en) 2014-03-07 2016-12-01 Mitsubishi Electric Corporation Partial discharge sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114217189A (zh) * 2021-12-30 2022-03-22 国网江苏省电力有限公司南通供电分公司 一种采用特高频暂态电流测量的gil设备故障定位方法
CN119805310A (zh) * 2025-03-11 2025-04-11 广东电网有限责任公司佛山供电局 一种融合磁场-电流特征的gis母线电接触缺陷诊断方法和相关装置

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