EP3347727A1 - Procédé de localisation de décharges partielles dans un appareillage électrique, système de localisation de décharges partielles et boitier de couplage - Google Patents
Procédé de localisation de décharges partielles dans un appareillage électrique, système de localisation de décharges partielles et boitier de couplageInfo
- Publication number
- EP3347727A1 EP3347727A1 EP16769889.3A EP16769889A EP3347727A1 EP 3347727 A1 EP3347727 A1 EP 3347727A1 EP 16769889 A EP16769889 A EP 16769889A EP 3347727 A1 EP3347727 A1 EP 3347727A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signals
- coupling
- signal
- representative
- sum
- 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.)
- Withdrawn
Links
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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Definitions
- the invention relates to the field of high voltage devices isolated by insulating fluids, such as electrical substations isolated by a dielectric gas, and methods for controlling these same electrical equipment.
- Partial discharge detection methods such as that described in document EP 2726888 A1, are therefore used in the control of electrical equipment in order to detect such defects and are generally followed when such discharges are detected. an inspection of the equipment.
- a first method is termed location in the time domain.
- This method consists, as illustrated in FIGS. 1a and 1b, in equipping the high-voltage electrical equipment with at least a first and a second UHF sensor 11, 12 and measuring the representative signal 201, 202 of a partial discharge on each of these UHF sensors.
- the time offset ⁇ t between the detection of the signal of a partial discharge on the first UHF sensor and the detection of the signal of this same partial discharge on the second sensor is directly related, as illustrated in Figure la, at the distance difference X2.
- a simple calculation based on the speed of the UHF wave in the atmosphere of the electrical equipment makes it possible to go back to the distance difference X2-X1 and thus to the location of the partial discharge in the electrical equipment 10.
- this location method allows a simple location of the location of the electrical equipment 10 where partial discharges take place, it has a number of disadvantages. Indeed, it requires the use of an acquisition system additional fast, such as an oscilloscope, relatively expensive. This method is moreover strongly sensitive to any reflections of the partial discharge signal that may be produced by the non-straight portions of the electrical equipment 10. Thus, it is not uncommon for the calculation of the time offset ⁇ t to be carried out in such a way that erroneous on one of these reflections and therefore that the location obtained is erroneous.
- Hoek and his co-authors also describe a frequency domain detection method with interference measurement. This method is also based on the time shift between the signal of a partial discharge received on a first sensor 11 and a second sensor 12.
- the signals of a partial discharge 20 obtained from the first and the second sensor 11, 12 can be considered substantially identical with a corresponding phase shift At offset, it is possible to calculate a function of interference between these two signals to determine this shift.
- This interference function can be expressed mathematically as follows:
- the interference function can therefore be approximated in the frequency domain by a function
- the interference function although periodic, moves away from the idealized form of the rectified cosine.
- S. M. Hoek and his co-authors show that a wavelet transform of the interference function in the frequency domain makes it possible to measure a "fundamental frequency" of the interference function and thus to determine the time shift At.
- the aim of the invention is to remedy at least partially these drawbacks and is thus intended to provide a method for locating partial discharges in high-voltage electrical equipment isolated by a dielectric fluid that is both robust and therefore insensitive to possible reflections of partial discharge signals in the electrical equipment, and which is simplified compared to the method of locating a partial discharge in the frequency domain of the prior art.
- the invention relates to a method for locating a partial discharge in high voltage electrical equipment isolated by a dielectric fluid comprising at least a first and a second UHF sensor, said method comprising the following steps:
- Such a method allows a location of the partial discharge robust and unaffected by any disturbances. Indeed, the first and the second representative signal and the sum signal being acquired simultaneously, the equality approximation between the first and the second representative signal when calculating the interference function is checked. Thus, the determination of the time shift from the interference function is facilitated even in a disturbed environment, all the more so when it is implemented using a wavelet transform.
- a representative signal has a proportionality link with respect to the first signal at least according to one of its variables, such as voltage, current or power.
- a representative signal has a power equal to a predetermined fraction of said first signal, for example half or third, it being understood that this does not exclude that the power of the representative signal can be equal to the power of said first signal or even be equal to a multiple of this same power.
- the determining step may comprise a sub-step of performing a wavelet transform.
- Such a sub-step is particularly suitable for allowing the determination of the time shift from the interference function even when the UHF signals are noisy. A particularly robust localization method is thus obtained.
- the invention further relates to a system for locating a partial discharge in high voltage electrical equipment isolated by a dielectric fluid, said electrical apparatus comprising at least a first and a second UHF sensor,
- the location system comprising:
- At least a first and a second input connector intended to be respectively connected to the first and second UHF sensors and adapted to respectively recover a first and a second signal respectively from the first and second UHF sensors
- At least a first and a second separation device respectively connected to the first and second input connectors and adapted to respectively share the first and second signals in at least two representative signals on at least two respective channels
- At least one coupling device connected to the first and second separation devices and adapted to combine the representative signals so as to provide a sum signal representative of the sum of the first and the second signal
- At least one acquisition device connected to the first and second separation devices and to the coupling device and adapted to acquire the representative signals and the sum signal in parallel
- an analysis unit connected to the acquisition system and configured to perform a calculation of an interference function from the representative signals and the sum signal, said calculation of dividing the spectrum of the sum signal by the sum of the spectra of the signals representative of the first and second signals,
- said analysis unit being further configured to allow determination of the location of the partial discharge from the calculated interference function.
- Such a locating system makes it possible to implement a method of locating a partial discharge according to the invention and thus benefits from this process.
- the locating system may comprise a coupling box, said coupling box comprising the first and the second input connector, the first and the second separation device, and the coupling device, said coupling housing having a first, a second and a third output connector respectively connected to the first and second separating device and to the coupling device, said first, second and third output connectors being connected to the at least one acquisition device.
- a location system including such a coupling box is particularly suitable for providing a portable location system that can be connected to ready UHF sensors installed on the electrical equipment. Thus the technician is able to come on the spot to take measurements.
- the locating system may comprise at least a first and a second coupling unit
- the first coupling housing having the first input connector and a third input connector connected to the second coupling housing, a first and a third output connector,
- the second coupling housing comprising at least the second input connector, a second output connector and a fourth output connector through which the second coupling housing is connected to the third input connector of the first coupling housing.
- the first and the second coupling housing respectively comprising the first and the second separating device, the first and the second separating device being respectively connected to the first and second output connectors,
- the first coupling unit further comprising the coupling device connected to the first separation device and the third connector input, the latter being connected to the fourth output connector of the second coupling housing, the sum signal being supplied through the third output connector,
- the second separation device being connected to the fourth output connector
- the first, second and third output connectors being connected to the at least one acquisition device.
- each of the coupling boxes serves in turn first and second coupling housing in the sense of the invention.
- the first and the second coupling box may be identical.
- the acquisition device may comprise at least a first and a second acquisition module, the first channels of the first and second separation device being respectively connected to the first and second acquisition module and in which the coupling device is connected to the first acquisition module, each of the first and second acquisition modules being connected, or intended to be connected, to the analysis unit.
- the system can be permanently integrated into the electrical equipment with an acquisition module for each of the UHF sensors.
- Such a system can therefore easily be adapted to perform the method of locating a partial discharge at a distance without requiring the movement of a technician. It will be noted moreover that with such a configuration, the number of acquisition module is optimized.
- the locating system may comprise high voltage electrical equipment isolated by a dielectric fluid,
- the first and the second input connector, the first and the second separation device and the coupling device being integrated into the electrical equipment with the first and second input connectors connected respectively to the first and second sensors UHF, the electrical equipment comprising at least a first and a second output connector respectively connected to the first and second separation device, and a third output connector connected to the coupling device.
- the acquisition device and the analysis unit can be provided by at least one acquisition and analysis module independent of the high-voltage electrical equipment isolated by a dielectric fluid, said acquisition module and analysis system comprising a first, a second and a third connector respectively connected to the first, second and third input connector.
- the system can be partially integrated into the electrical equipment, the technician can intervene with a portable acquisition and analysis module to implement the method of locating a partial discharge, or intervene remotely if the system is connected to a remote computer via a computer network.
- the first and the second separation device can each be a divider
- the coupling device may be an inverted mixer or divider mounted.
- the invention also relates to a coupling box for a system according to the invention, said coupling box comprising:
- a first and a second input connector intended to be respectively connected to a first and second UHF sensor of a high voltage electrical equipment isolated by a dielectric fluid, and adapted to respectively recover a first and a second signal respectively from the first and second UHF sensor
- a first and a second separation device respectively connected to the first and second input connectors and adapted to respectively separate the first and second signals into two representative signals on at least two respective channels
- at least one coupling device connected to the first and second separation devices and adapted to combine the representative signals so as to provide a sum signal representative of the sum of the first and second signals
- first, a second and a third output connector respectively connected to the first and second separation devices and to the coupling device, said first, second and third output connectors being intended to be connected to at least one connected acquisition device; to an analysis unit for forming a location system according to the invention.
- Such a coupling box is particularly adapted to equip a portable discharge location system.
- a technician having to implement a method of locating a partial discharge can do so on an apparatus simply equipped with UHF sensor by connecting the connected coupling unit a portable acquisition and analysis module with two UHF sensors. sequence between which a partial discharge is likely to exist.
- the invention further relates to a coupling housing for a locating system according to the invention comprising:
- a first input socket for forming the first input connector of the location system, said first input socket being adapted to recover a first signal from the first UHF sensor
- a second input socket for forming the third input connector and for being connected to a substantially identical second coupling housing, said second coupling housing having its first input socket connected to a second UHF sensor so that it forms the second input connector of the location system,
- a separation device connected to the first input socket and adapted to separate the first signal into three representative signals on three respective channels
- a coupling device connected to the separation device and to the second input socket and adapted to combine the representative signal and the signal supplied by the second coupling unit so as to provide a sum signal representative of the sum of the first signal and the second signal
- the second and third output sockets being intended to respectively form the first and third output connectors and to be connected to at least one acquisition device which is itself connected to an analysis unit so as to form with the second coupling unit a location system according to the invention.
- Such coupling boxes are particularly suitable for permanent installation in electrical equipment by equipping each of the UHF sensors of the electrical equipment.
- an acquisition module fitted to each of the coupling boxes and an analysis unit it is possible to provide a partial discharge location system that can be controlled remotely.
- FIGS. 1a and 1b respectively illustrate an electrical equipment isolated by a dielectric fluid equipped with a first and a second UHF sensor in which electrical equipment takes place a partial discharge to be located and the measurements of the signal of a partial discharge obtained on the first and the second UHF sensor,
- FIG. 2 illustrates a high voltage electrical equipment isolated by dielectric fluid comprising three phases each equipped with a first and a second UHF sensor, and a partial discharge location system equipping one of the phases of said electrical equipment
- FIG. 3 illustrates a coupling unit equipping the positioning system illustrated in FIG. 2 with part of its wall torn off to illustrate a first and a second separation device and a coupling device
- FIG. 4 is a flowchart illustrating the main steps and sub-steps of a method for locating partial discharges according to the invention
- FIG. 5 illustrates an example of the signals acquired by an acquisition unit as illustrated in FIG. 3 with, respectively, at A, B and C, the signals acquired from a first and a second UHF sensor of FIG. electrical equipment and a sum signal, these same signals seen in the frequency domain, respectively D, E and F, and an interference function G in the frequency domain calculated from these same signals,
- FIGS. 6a and 6b illustrate an example of interference function respectively in the frequency domain and after wavelet transform of the family of "cosine-rectified" wavelets
- FIG. 7 illustrates an electrical apparatus forming part of a locating system according to a second embodiment of the invention, said electrical equipment comprising several UHF sensors equipped to enable the partial discharge to be located
- FIG. 8 illustrates a coupling box adapted to equip an electrical apparatus according to the second embodiment
- FIG. 9 illustrates a coupling box adapted to equip an electrical apparatus according to the second embodiment, this coupling box being specific to the first UHF sensor of said apparatus,
- FIG. 10 illustrates the connection between them of the coupling casings of the location system according to the second embodiment, the first and the last coupling casing not being specific and being equipped with 50-ohm end plugs,
- FIG. 11 illustrates the connection of two successive coupling boxes according to the second embodiment.
- FIG. 2 illustrates a high-voltage electrical apparatus 10 comprising three phases each equipped with a first and a second UHF sensor 11, 12, such as UHF antennas.
- the phase of the electrical equipment 10 furthest from the foreground presents its first and second UHF sensors 11, 12 connected to a partial discharge location system 100 according to the invention in order to allow the detection of a partial discharge.
- the locating system 100 comprises: a coupling housing 20 to which are connected the first and second UHF sensors 11, 12, an acquisition device 30 connected to the coupling housing 20, and
- a computer 40 connected to the acquisition device 30.
- the coupling housing 20, as illustrated in FIG. 3, comprises:
- a mixer 25 also known under the name of a coupler connected at input to the second channels of the first and second divider 23, 24, a first, second and third output connector 26, 27, 28 respectively connected to the first channels of the first and second channels;
- second divider 25 also known under the name of a coupler connected at input to the second channels of the first and second divider 23, 24, a first, second and third output connector 26, 27, 28 respectively connected to the first channels of the first and second channels;
- the first and second divisors 23, 24 are both adapted to separate respectively the first and second signals in two representative signals on their respective first and second paths.
- the first and the second divider 23, 24 each form a separation device adapted to separate respectively the first and the second signal into two representative signals on at least two respective channels.
- the first and second dividers 23, 24 are adapted to respectively separate the first and second signals into two respective representative signals whose power corresponds to the power of the corresponding divided signal. by two.
- Such dividers 23, 24 have, among other things, the advantage of being passive components that do not require additional power supply.
- the coupling housing 20 may comprise another type of separation device without departing from the scope of the invention.
- the coupling housing 20 may also comprise, in substitution for the first and second divider 23, 24, a first and a second active component, that is to say supplied either by an external power supply, or by an internal power supply, adapted to provide on each of their first and second channels a representative signal substantially equal to the corresponding signal.
- the mixer 25 allows to combine the representative signals from the second channels of the first and second divider 23, 24 and outputs a signal sum corresponding to the sum of the signals representative of the first and second signals.
- the mixer 25 thus forms a coupling device connected to the first and second dividers 23, 24 and adapted to combine the representative signals so as to provide a sum signal representative of the sum of the first and second signals.
- the coupling device may also be formed by an inverted mounted divider, the first and second representative signals being then injected by the two outputs of the divider and the input of the divider serving as the exit.
- Such a mixer 25 has the further advantage of being a passive component and thus allows, with the first and the second divider, to provide a fully passive coupling box 20.
- the coupling housing 20 comprises a coupling device other than a mixer, the latter may be passive or active, without the we leave the scope of the invention.
- the coupling housing 20 when the latter is connected by its first and second input connector 21, 22 to the first and second UHF sensor 11, 12, the first, the second and the third output connector 26 , 27, 28 show signals respectively representative of the first and second signals and the sum of the first and second signals.
- the first, the second and the third output connectors 26, 27, 28 are all three connected to the acquisition device 30.
- the acquisition device 30 is adapted to acquire from the output connectors 26, 27, 28 of the coupling unit 20 the signals representative of the first and second signals and the sum of the first and second signals. the second signal. Acquisition of signals representative of the first and second signals and the sum of the first and second signals can be done directly in the frequency domain, or in the time domain, with a Fourier transform to obtain the spectrum of these signals.
- the acquisition device 30 illustrated in FIG. 2 is an acquisition device as described in document EP 2726888 A1 in which it is called a control device and illustrated in FIG. 3 of this document, comprising three acquisition channels. . It should be noted that, contrary to the invention, the three acquisition paths of this acquisition device are provided in this document to acquire the signals on the 3 phases of the high voltage switchgear.
- the acquisition device 30 according to the block diagram of FIG. 3 of this document, not reproduced here, comprises:
- connection terminals to a sensor respectively connected to the first, second and third inputs 26, 27, 28 of the coupling housing 20,
- ADCs analog / digital converters
- processing units synchronized by the acquisition system of a synchronization voltage and each adapted to process the digital signals from an analog / digital converter, also synchronized by the acquisition system,
- connection module (or COM) to a computer, said connection module being adapted to interface between the processing units and the computer 40, and being connected to the computer socket of the control device.
- Such an acquisition device 30 has the advantage of allowing both the detection of a partial discharge in the electrical equipment, as described in document EP 2726888 A1, and the acquisition of a frequency spectrum. It thus makes it possible to acquire the signals representing respectively the first and the second signal and the sum of the first and second signals in the frequency domain.
- the acquisition device 30 may be other than the acquisition device described in EP 2726888 A1 without departing from the scope of the invention.
- the acquisition device 30 may comprise one or more oscillators adapted to operate in the frequency range of the UHF, or one to several acquisition cards equipping the computer 40, where said cards being adapted to allow an acquisition of signals representative of the first and second signals and the sum of the first and second signals directly in the frequency domain, or in the time domain, with a Fourier transform to obtain the spectrum of these signals.
- the acquisition device 30 is itself connected to the computer 40 so as to transmit the signals acquired to the latter.
- the computer 40 is configured to, from the signals acquired by the acquisition device 30, calculate an interference function.
- the acquisition device 30 and the computer 40 together form an acquisition and analysis module.
- K (w) the interference function in the frequency domain
- H (w) the spectrum of the signal representative of the sum of the first and the second signals
- G (w) and F (w) the spectra of the signals respectively representative of the first and second signal.
- the computer 40 is configured to perform a Fourier transform of these representative signals to obtain these representative signals in the frequency domain.
- the signals representative of the first and second signals and their sum are therefore available to the computer 40, either by calculation or directly provided by the acquisition device 30, the computer 40 is configured to calculate the function of interference according to equation (1) above.
- the computer 40 is also configured to allow, from the calculated interference function, a determination of the location of the partial discharge.
- the interference equation can be approximated in the frequency domain to a rectified cosine whose "frequency" period Af is equal to the inverse of the time offset At (see equation (2)). It is therefore sufficient to determine the period of the interference function to deduce, from the speed of an electromagnetic wave in the electrical equipment, a differential X2-X1 of the distance from the location where the discharge takes place. partial between the first and the second UHF sensor. Such a differential then makes it easy to deduce precisely the location of the partial discharge and perform the necessary inspection operations.
- the computer in order to allow the determination of the period of the interference function in the frequency domain, can be adapted to perform on the interference function a wavelet transform on the basis of the family of corrected cosine wavelets.
- a wavelet of this family can be written according to the following equation:
- a wavelet transform consists of performing the following calculation
- the computer may be configured to determine this correlation maximum and the associated time offset, or may be configured to display the correlation graph so that a technician determines on this graph the corresponding dilation factor. and therefore the corresponding time shift.
- This second solution is to be preferred, since it allows the technician using the detection system to check on the correlation graph, the proper implementation of the detection method.
- the computer forms a communication unit. analysis according to the invention.
- Such an analysis unit is thus configured to perform a calculation of an interference function from the signals representative of the first and second signals and of the sum signal, this calculation consisting of dividing the spectrum of the sum signal by the sum of the spectra. signals representative of the first and second signals.
- Said analysis unit is further configured to determine the location of the partial discharge from the calculated interference function.
- Such a system 100 of a partial discharge allows the implementation of a method of locating a partial discharge.
- Such a partial discharge location method comprises, as illustrated in the flow chart of FIG. 4, the following steps:
- the acquisition of the representative signals is carried out during step E4 through the first channels of the dividers 23, 24, while the coupling of the representative signals provided through the second channels of the dividers 23, 24 is performed in the step E3.
- the steps E1-E3 are implemented by means of the coupling box 20, while the step E4 and the steps E5 and E6 are respectively implemented by means of the acquisition device 30 and the computer 40.
- the step of determining the location of the partial discharge comprises the following sub-steps:
- the substep E61 is implemented by means of the computer 40, the substep E62 can be performed manually by a technician, using the assistance or not the computer 40, or by the computer in an automated way.
- the substep E62 can consist in carrying out the following operations: graphical display on the computer screen of the result of the wavelet transform of the interference function,
- FIGS. 5, 6a and 6b illustrate the results of each of these steps of such a method when locating a partial discharge in an isolated electrical station by a dielectric fluid, such as, for example, sulfur hexafluoride gas.
- a dielectric fluid such as, for example, sulfur hexafluoride gas.
- FIG. 5 illustrates at A and B, respectively, the signal captured by means of the acquisition device 30 from the first and second UHF sensors 11, 12, and represented in the time domain. It can be seen from these two graphs that the signal on the second sensor 12 is delayed by about 13.4 ns.
- C of this same figure is illustrated the signal sum corresponding to the sum of the signal of the first and the second UHF sensor 11, 12.
- D, E and F of FIG. 5 are respectively illustrated the spectrum of the signals illustrated respectively in A, B, C of Figure 5.
- These three spectra D, E and F are acquired directly in the frequency domain and correspond to the signals represented in FIG. 5 A, B, C in the time domain. These three spectra are used to determine the interference function illustrated in FIG. 5G in the frequency domain. It may be noted that, alternatively, according to a possibility of the invention, these signals can be acquired in the time domain and then transposed in the frequency domain by a Fourier transform by means of the computer 40.
- FIG. 6a illustrates this example of an interference function 203 connected in parallel with a rectified cosine 204 whose "frequency" period Af is equal to the inverse of the time offset ⁇ t between the first and the second signal (see in this connection). equation (2) described in the preamble of this document). The simple paralleling of these signals does not confirm the good correlation between the two.
- Figure 6b illustrates the result of the wavelet transform of the interference function of Figure 6a. It is observed in the graph of FIG. 6b that while FIG. 6a does not show a clear correlation between the interference function 203 and the rectified cosine 204, this correlation is perfectly proved by the wavelet transform. Passing through a wavelet transform makes it possible to overcome the disturbances that affect the interference function and to provide a robust localization method.
- the corresponding time offset At is 13.4ns, that is to say a difference in distance from the first and second UHF sensor of about 4m.
- the electrical equipment 1010 may at least partly be pre-equipped to allow such a location.
- Such a locating system differs from a locating system 100 according to the first embodiment in that the functions performed by the coupling box and the acquisition device are permanently installed in the electrical equipment 1010, the system detection device according to this embodiment comprising the electrical equipment 1010.
- the electrical apparatus 1010 according to this second embodiment comprises:
- the electrical equipment 1010 illustrated in FIG. 7 comprising n UHF sensors 1011, 1012 ..., 101 ⁇ on each of its three phases,
- a divider 1021, 1022 ..., 102n for each of the UHF sensors 1011, 1012 ..., 101 ⁇ except the last, comprising a first, a second and a third channel, only the dividers 1021, 1022 .. ., 102n of the phase closest to the first plane of the drawing being shown in FIG. 7, the divider 1021 corresponding to the first UHF sensor 1011 having only first and second channels, each of the dividers 1021, 1022 ... , 102n being connected to the corresponding UHF sensor 1011, 1012 ..., 101 ⁇ and being adapted to provide on each of their first, second and third channels a signal representative of the corresponding UHF sensor signal 1011, 1012 ..., 101 ⁇ ,
- each mixer 1031, 1032 ..., 103n for each of the UHF sensors 1011, 1012 ..., 101 ⁇ except the last, each mixer 1031, 1032 ..., 103n being connected to two dividers 1021, 1022 .. ., 102n succeeding one another, said mixer 1031, 1032 ..., 103n being connected to the third channel of the first and second channels of the second and being adapted to supply a signal representative of the sum of the signals of the UHF sensors 1011, 1012 ..., 101 ⁇ corresponding to two successive divisors 1021, 1022 ..., 102n,
- the last UHF sensor 101 ⁇ like the first UHF sensor, has a particular configuration.
- no mixer corresponds to it and the corresponding divider 102n has only a first and a second channel, the first channel being connected to the mixer 103n-1, of the UHF sensor 101n-1 which precedes the last UHF sensor 101 ⁇ , and the second channel being connected to the acquisition module 104n, corresponding to the latter UHF sensor 10n.
- Acquisition modules 1041, 1042 ..., 104n are of the same type as that described in document EP 2726888 A1 and in the first embodiment, with the difference that they comprise six input connectors, ie one pair phase input connectors of the electrical equipment 1010, and six acquisition channels of a signal each corresponding to a respective input connector so as to allow acquisition of the UHF signal injected by said channel.
- first input connector for the corresponding UHF sensor signal acquired by the corresponding second divider channel (first channel for that of the first UHF sensor) and a second input connector. for the sum signal supplied by the mixer corresponding to said UHF sensor.
- the acquisition modules 1041, 1042 ..., 104n are illustrated in FIG. 7 only connected to the UHF sensors 1011, 1012 ..., 101 ⁇ of one of the phases of the electrical equipment 1010.
- the UHF sensors of the other phases of the electrical equipment 1010 are also connected via dividers and mixers to acquisition modules 1041, 1042 ..., 104n, these acquisition modules can be the same as those used for the first phase or other acquisition modules.
- Acquisition modules 1041, 1042 ..., 104n are each connected to the computer, not shown in FIG. 7, by a computer link.
- a computer link may be a direct link, wired or wireless, in the case where the computer is installed on site, or a link provided by a private or public computer network for a remote computer.
- the signals representative of the UHF sensor signal m and the sum of the signals UHF sensors m and m + 1 are acquired by means of the acquisition module corresponding to the UHF sensor m whereas the signal representative of the signal of the UHF sensor m + 1 is acquired by means of the acquisition module corresponding to the UHF sensor m + 1.
- the mixers 1021, 1022 ... and the dividers of the electrical equipment can be arranged in a housing so as to form a coupling housing 2020a as illustrated in FIG. coupling 2020a is referenced in correspondence with the UHF sensor 1012 of FIG. 7, the divider 2023 and the mixer 2024 corresponding respectively, as indicated by their double reference, to the divider 1022 and to the mixer 1032.
- Such a coupling unit 2020a comprises: a first and a second input socket 2021, 2022 intended to be respectively connected to the corresponding UHF sensor 1012 and the divider 1023 corresponding to the UHF sensor 1013 which directly succeeds the UHF sensor 1012 corresponding to the housing of 2020a coupling,
- the divider 2023 connected to the first input socket 2021, the divider comprising a first, a second and a third channel,
- the mixer 2024 connected to the third channel of the divider 2023 and to the second input socket 2022,
- first, second and third output jacks 2025, 2026, 2027 respectively connected to the first and second channels of the divider 2023 and to the mixer 2024.
- the first output socket is intended to be connected to the input of the mixer 1031 corresponding to the UHF sensor 1011 that the UHF sensor 1012 corresponding to the coupling unit 2020a succeeds directly.
- the second and third output jacks are connected to the acquisition module 1042 of the corresponding UHF sensor 1012 in order to enable the latter to acquire the signal representative of the corresponding UHF sensor signal 1012 and the signal representative of the sum of the sensor signal. Corresponding UHF 1012 and the UHF 1013 sensor which succeeds it directly.
- connectors and sockets used above and throughout the rest of this document are purely synonymous and interchangeable. These two different terminologies are used solely for the purpose of differentiating the denomination of the plugs of the coupling units of this second embodiment of the connectors of the locating system formed by these coupling units. It can thus be noted that these terminologies must be included in their widest definition, these having to include any type of connection making it possible to provide an electrical connection.
- connectors or sockets may for example cover, according to certain variants of the invention, solder contacts.
- the coupling housing 2020b corresponding to the first UHF sensor 1011, as illustrated in FIG. 9, differs from the coupling housing illustrated in FIG. 8 in that:
- the divider 2023b has only a first and a second channel, the mixer 2024 is connected to the second channel of the divider 2023b,
- the coupling unit 2020b has only first and second output jacks 2026, 2027 respectively connected to the first channel of the divider 2023b and to the mixer 2024.
- the coupling housing, not illustrated, of the last UHF sensor 101 ⁇ differs from a coupling housing illustrated in FIG. 8 in that it comprises:
- a single divider comprising only a first and a second channel
- a first and a second output respectively connected to the first and second channels of the divider.
- the coupling boxes corresponding to the first and the last UHF sensor 1011 may be of the same type as that illustrated in FIG. Figure 10 illustrates the connection of the coupling boxes to each other in such a configuration.
- the first UHF sensor 1011 In the case of the first UHF sensor 1011, only the second and third output jacks 2026, 2027 of the corresponding coupling unit are connected, the first output junction 2025 remaining free and preferably being closed by an impedance terminating plug 2028. characteristic 50 Ohms. In the case of the last UHF sensor, the second input jack 2022 and the third output jack 2027 are not connected and are preferably closed by a terminator plug 2028, characteristic impedance 50 Ohms.
- a location system thus defined comprises a first coupling housing, that of the UHF sensor m, and a second coupling housing, that of the UHF sensor m + 1.
- This locating system exemplified in FIG. 11, conforms to that according to the second embodiment with, with reference to the coupling housing illustrated in FIG. 8:
- the first coupling unit 2020a (that corresponding to the UHF sensor m) which comprises the first input connector formed by the first input socket 2021, and a third input connector formed by the second input socket 2022 connected to the second coupling housing 2020a (corresponding to the UHF sensor m + 1), the first and third output connectors, respectively the second and third output jacks 2026, 2027,
- the second coupling unit 2020a which comprises at least the second input connector, formed by its first input socket 2021, the second output connector, formed by its second output socket 2026 and a fourth output connector, its first output socket 2025, by which the second coupling box 2020a is connected to the third input connector which is formed by the second input jack 2022 of the first coupling housing.
- the first and the second coupling housing 2020a also comprises respectively the first and the second separator 2023, the first channels of the first and second separator 2023 being respectively connected to the first and the second output connector 2026, that is to say say the respective second outlet 2026 of the first and second coupling housing (those UHF sensors m and m + 1).
- the first coupling unit 2020a further comprises the mixer 2024 connected to the second channel of the first splitter 2023 and the third input connector 2022, that is to say the second input terminal, the latter being connected to the fourth connector of output 2025, i.e. the first output socket of the second coupling housing 2020a, the sum signal being supplied through the third output connector, i.e. the third output socket 2027 of the first coupling housing 2020a.
- the second path of the second separation device is connected to the fourth output connector 2025, i.e. the first output socket of the second coupling housing.
- the signals representative of the UHF sensor m and the sum of the signals of the UHF sensor m and the UHF sensor m + 1 are respectively available on the first and the third output connector 2026, 2027 corresponding to the second and third taps.
- first exit coupling box 2020a (that corresponding to this UHF sensor m) and which are connected to the acquisition module of the UHF sensor m.
- the signal representative of the sensor m + 1 is therefore available on the second output connector 2026 corresponding to the second output socket of the second coupling unit 2020a (that corresponding to the UHF sensor m + 1) which is connected to the acquisition module of the UHF sensor m + 1.
- Such a second embodiment allows a location of partial discharges at a distance, that is to say, without the intervention of a person at the level of the electrical equipment, provided that the system formed by the housings of acquisition 1041, 1042 ..., 104n and the computer is connected to a remote computer via a computer network.
- the step of determining the location of the partial discharge can, as in the first embodiment, be carried out manually by a technician from a remote computer, using the assistance or not of the computer, or by the computer. computer in an automated way.
- the electrical equipment 1010 comprises an acquisition module 1041, 1042 ..., 104n for each of the UHF sensors 1011, 1012, 1013 ..., 101 ⁇
- the electrical equipment is pre-equipped in a mixer and divider to obtain for each pair of UHF sensors succeeding each other the signals representative of each of the signals of these two UHF sensors and their sum, the acquisition being obtained by connecting an external acquisition box as shown in Figure 2.
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Abstract
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1558306A FR3040781B1 (fr) | 2015-09-08 | 2015-09-08 | Procede de localisation de decharges partielles dans un appareillage electrique, systeme de localisation de decharges partielles et boitier de couplage |
PCT/EP2016/071162 WO2017042261A1 (fr) | 2015-09-08 | 2016-09-08 | Procédé de localisation de décharges partielles dans un appareillage électrique, système de localisation de décharges partielles et boitier de couplage |
Publications (1)
Publication Number | Publication Date |
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EP3347727A1 true EP3347727A1 (fr) | 2018-07-18 |
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ID=54291547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16769889.3A Withdrawn EP3347727A1 (fr) | 2015-09-08 | 2016-09-08 | Procédé de localisation de décharges partielles dans un appareillage électrique, système de localisation de décharges partielles et boitier de couplage |
Country Status (3)
Country | Link |
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EP (1) | EP3347727A1 (fr) |
FR (1) | FR3040781B1 (fr) |
WO (1) | WO2017042261A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110554293A (zh) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | 一种局放信号处理装置 |
CN112748274B (zh) * | 2019-10-31 | 2023-05-16 | 西安西电高压开关有限责任公司 | 电流测量装置 |
EP3879284B1 (fr) * | 2020-03-13 | 2024-06-05 | General Electric Technology GmbH | Système de localisation de défauts et procédé de localisation de défauts associés |
Family Cites Families (1)
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FR2977322B1 (fr) | 2011-06-30 | 2014-03-14 | Alstom Grid Sas | Procede et dispositif de controle d'un poste electrique haute tension isole au gaz |
-
2015
- 2015-09-08 FR FR1558306A patent/FR3040781B1/fr active Active
-
2016
- 2016-09-08 EP EP16769889.3A patent/EP3347727A1/fr not_active Withdrawn
- 2016-09-08 WO PCT/EP2016/071162 patent/WO2017042261A1/fr active Application Filing
Also Published As
Publication number | Publication date |
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FR3040781A1 (fr) | 2017-03-10 |
FR3040781B1 (fr) | 2017-10-13 |
WO2017042261A1 (fr) | 2017-03-16 |
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