NL2018552B1 - Measurement system for monitoring gas insulated system - Google Patents
Measurement system for monitoring gas insulated system Download PDFInfo
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- NL2018552B1 NL2018552B1 NL2018552A NL2018552A NL2018552B1 NL 2018552 B1 NL2018552 B1 NL 2018552B1 NL 2018552 A NL2018552 A NL 2018552A NL 2018552 A NL2018552 A NL 2018552A NL 2018552 B1 NL2018552 B1 NL 2018552B1
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- measurement system
- gis
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- current sensor
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- 238000005259 measurement Methods 0.000 title claims abstract description 61
- 238000012544 monitoring process Methods 0.000 title claims abstract description 6
- 239000004020 conductor Substances 0.000 claims abstract description 82
- 125000006850 spacer group Chemical group 0.000 claims abstract description 34
- 238000011156 evaluation Methods 0.000 claims description 28
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
Measurement system for monitoring a gas insulated system, the gas insulated system comprising at least two GIS segments (2). Each of the at least two GIS segments (2) has a central conductor (3) and an outer conductor (4) coaxially positioned around the central conductor (3). An insulating spacer (5) is positioned between two adjacent outer conductors (4) of the at least two GIS segments (2), and an electrical conducting element (6) is in electrical connection with the two adjacent outer cylindrical conductors (4). The measurement system (1) further has a current sensor (7) in measuring relationship with the at least one electrical conducting element (6), which is e.g. formed by one of a plurality of fixing rods (8) extending through the spacer (5).
Description
Field of the invention
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.
Background art
The international patent publication W02007/097491 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. In general, using a UHF antenna for PD detection requires the presence of a window in an outer side of the switchgear, which allows transmission of radiofrequency (RF) radiation to detect RF radiation inside the gas insulated switchgear originating from a PD event.
US patent publication US2016/349343 discloses PD detection using a slot antenna, parts of which are formed by bolts connecting end flanges of GIS compartments with an insulating spacer in between. Although the insulating spacer is here used to accommodate the antenna, this system still only allows to detect the radiation caused by a partial discharge event.
Summary of the invention
The present invention seeks to provide an improved measurement system for detecting partial discharges in a gas insulated system.
According to the present invention, 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.
Short description of drawings
The present invention will be discussed in more detail below, with reference to the attached drawings, in which
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; and
Fig. 5 shows a schematic view of a measurement system according to an embodiment of the present invention.
Description of embodiments
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. 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 ‘GISj.
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. In a 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. When a PD occurs at a certain location of the insulation system, resulting PD current pulses 11a, 11b propagate along the GIS as the GIS behaves as a transmission line for the (high frequency content) PD pulses.
In existing GIS installations, 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.
According to the present invention embodiments, 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 11a, 11b induced by a PD event 10 within the GIS segment 2.
As shown in the general structure of the GIS installation of Fig. 1, 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. By measuring the current through one of the fixing rods 8, or in more general terms (see also the embodiment described with reference to Fig. 4 below) through an electrical conducting element 6 connecting two adjacent outer conductors 4, it is then possible to detect the PD current pulses 11a, 11b.
In a generic sense, 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 comprising 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.
In this embodiment, 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. As shown in this exemplary embodiment, 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. As indicated in Fig. 2, 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. In this embodiment (and in the embodiment shown in Fig. 2), the at least one electrical conducting element 6 is one of the plurality of fixing bolts 8. In other words, the current sensor 7 is provided as a coaxial arrangement around one of the fixing rods 8.
In the embodiment shown in Fig. 3, 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. In order to minimize disadvantageous effects (because of the added path length for the current) the width of the current sensor 7 is chosen to be as low as possible. With reference to Fig. 3, the two outer conductors 4 of adjacent GIS segments 2 are attached to each other with an insulating spacer 5 in between by sixteen fixing rods 8. Without the nuts 15 and rings 16 there would be no electrical connection between the fixing rods 8 and the outer conductors 4, because of the insulating sleeve 17. In the embodiment shown in Fig. 3 (with the installed nuts 15 and rings 16) 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. As at the location 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.
In a specific embodiment, 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. In alternative arrangements, 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. In general, 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. Compared to the embodiment shown in Fig. 2, 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. If 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.
In a further embodiment, 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). In this case, depending on the (HF) impedance of the external conductor 6, a larger current part will flow through the external conductor 6 allowing easier detection of a PD pulse.
In both embodiments, 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.
Furthermore, in all embodiments described above, 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. E.g. in the exemplary embodiments shown in Fig 2 and 3, 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.
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. 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. To ensure proper detection 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.
In a further embodiment, 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.
As an example, 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 11a, 11b 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%. In a further embodiments, where 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).
In an even further embodiment (as shown in the exemplary schematic view of Fig. 5), 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 5a between two further GIS segments 2. If current pulses are detected at several spacers 5, 5a, 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 11 a and a right travelling half pulse 11b. If all current sensors 7, 7a are installed with the same polarity, 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.
Also further complex determinations can be made by proper testing protocols being executed by the evaluation unit 12. E.g. 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.
Furthermore, 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.
Alternatively or additionally, 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.
These more complex measurement methods (location determination of a PD and fault detection) may be advantageously used when gas insulated lines (GIL) are employed, which typically have a larger dimension in length, and which (in operation) may be much more difficult to access physically.
The present invention embodiments may be summarized as the following interdependent embodiments:
Embodiment 1. Measurement system for monitoring a 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 conductors (4), the measurement system (1) comprising a current sensor (7) in measuring relationship with the at least one electrical conducting element (6).
Embodiment 2. Measurement system according to embodiment 1, wherein the at least one electrical conducting element (6) is one of a plurality of fixing rods (8) mechanically connecting the two adjacent outer conductors (4) and the insulating spacer (5).
Embodiment 3. Measurement system according to embodiment 1 or 2, wherein the current sensor (7) comprises a magnetic core surrounding the at least one electrical conducting element (6).
Embodiment 4. Measurement system according to embodiment 3, wherein the current sensor (7) comprises a high frequency current transformer (HFCT).
Embodiment 5. Measurement system according to embodiment 1 or 2, wherein the current sensor (7) comprises a magnetic field sensor positioned in vicinity of the at least one electrical conducting element (6).
Embodiment 6. Measurement system according to embodiment 5, wherein the current sensor (7) comprises a Rogowsky coil.
Embodiment 7. Measurement system according to any one of embodiments 1-6, wherein the current sensor (7) is integrated into the insulating spacer (5).
Embodiment 8. Measurement system according to embodiment 1 or 2, 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). Embodiment 9. Measurement system according to embodiment 8, further comprising a plurality of fixing rods (8) mechanically connecting the two adjacent outer conductors (4) and the insulating spacer (5), wherein one of the plurality of fixing rods (8) is an insulating rod, and the external conductor (6) is mechanically connected to the insulating rod.
Embodiment 10. Measurement system according to embodiment 8 or 9, wherein the external conductor (6) is selected from the group comprising:
a flexible cable, a metal strip, a stack of metal strips.
Embodiment 11. Measurement system according to any one of embodiments 1-10, wherein 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.
Embodiment 12. Measurement system according to embodiment 11, wherein the evaluation unit (12) is further arranged to determine a ratio of measurement current through the at least one electrical conducting element (6) and a current through the outer conductor (4) caused by a pulse event.
Embodiment 13. Measurement system according to embodiment 12, wherein the evaluation unit (12) is further arranged to determine the ratio by simulation.
Embodiment 14. Measurement system according to embodiment 12, wherein the evaluation unit (12) is further arranged to determine the ratio by calibration.
Embodiment 15. Measurement system according to any one of embodiments 11-14, further comprising 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 (5a) between two further GIS segments (2).
The present invention has been described above with reference to a number of exemplary embodiments as shown in the drawings. Modifications and alternative implementations of some parts or elements are possible, and are included in the scope of protection as defined in the appended claims.
Claims (15)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2018552A NL2018552B1 (en) | 2017-03-20 | 2017-03-20 | Measurement system for monitoring gas insulated system |
| PCT/NL2018/050174 WO2018174711A1 (en) | 2017-03-20 | 2018-03-20 | Measurement system for monitoring gas insulated system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2018552A NL2018552B1 (en) | 2017-03-20 | 2017-03-20 | Measurement system for monitoring gas insulated system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2018552B1 true NL2018552B1 (en) | 2018-09-28 |
Family
ID=59031359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2018552A NL2018552B1 (en) | 2017-03-20 | 2017-03-20 | Measurement system for monitoring gas insulated system |
Country Status (2)
| Country | Link |
|---|---|
| NL (1) | NL2018552B1 (en) |
| WO (1) | WO2018174711A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217189A (en) * | 2021-12-30 | 2022-03-22 | 国网江苏省电力有限公司南通供电分公司 | GIL equipment fault positioning method adopting ultrahigh frequency transient current measurement |
| CN119805310B (en) * | 2025-03-11 | 2025-06-06 | 广东电网有限责任公司佛山供电局 | GIS bus electrical contact defect diagnosis method and related device integrating magnetic field-current characteristics |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070115008A1 (en) * | 2005-09-01 | 2007-05-24 | Barth Jon E | Pulse current sensor |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100757075B1 (en) | 2006-02-22 | 2007-09-10 | 구자윤 | Partial discharge detection device of gas insulated switchgear |
-
2017
- 2017-03-20 NL NL2018552A patent/NL2018552B1/en not_active IP Right Cessation
-
2018
- 2018-03-20 WO PCT/NL2018/050174 patent/WO2018174711A1/en not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070115008A1 (en) * | 2005-09-01 | 2007-05-24 | Barth Jon E | Pulse current sensor |
| 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 |
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| Publication number | Publication date |
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| WO2018174711A1 (en) | 2018-09-27 |
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