FR2930041A1 - Electrical fault i.e. earth fault, detecting device for alternative triphase electrical supply network of aircraft, has comparison unit to compare voltages representing sum of measurement current with detection threshold value - Google Patents
Electrical fault i.e. earth fault, detecting device for alternative triphase electrical supply network of aircraft, has comparison unit to compare voltages representing sum of measurement current with detection threshold value Download PDFInfo
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- FR2930041A1 FR2930041A1 FR0852463A FR0852463A FR2930041A1 FR 2930041 A1 FR2930041 A1 FR 2930041A1 FR 0852463 A FR0852463 A FR 0852463A FR 0852463 A FR0852463 A FR 0852463A FR 2930041 A1 FR2930041 A1 FR 2930041A1
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- 238000005259 measurement Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000007257 malfunction Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/347—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using summation current transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
-
- 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
DEMANDE DE BREVET B06-2372FR - ODE/EVH Société par actions simplifiée dite : ECE PATENT APPLICATION B06-2372 - ODE / EVH Simplified Joint Stock Company: ECE
Dispositif de détection d'un défaut électrique dans un réseau alternatif Invention de : Philippe NANEIX Device for detecting an electrical fault in an alternative network Invention of: Philippe NANEIX
Dispositif de détection d'un défaut électrique dans un réseau alternatif L'invention concerne la détection de défauts électriques dans un réseau d'alimentation alternatif. Elle concerne plus particulièrement la détection d'un défaut électrique dans un réseau électrique triphasé, notamment la détection de l'apparition d'une composante continue dans un signal d'alimentation délivré par un tel réseau ou la détection d'un défaut à la terre. The invention relates to the detection of electrical faults in an alternating power supply network. It relates more particularly to the detection of an electrical fault in a three-phase electrical network, in particular the detection of the appearance of a DC component in a supply signal delivered by such a network or the detection of a ground fault. .
Une application particulièrement intéressante de l'invention concerne la détection de défauts électriques dans un réseau alternatif embarqué à bord d'un aéronef. Par exemple, pour une telle application, la détection d'un défaut utilise des transformateurs de courant assurant une surveillance en continu des courants de phase. Lorsque la différence entre les courants de phase où la valeur de chaque courant de phase dépasse des valeurs de seuil respectives, un relais est ouvert afin d'éviter que le défaut ne se propage. Un dispositif de détection connu de ce type est par exemple décrit dans le document US 7, 023, 196. Il s'agit essentiellement, dans ce document, d'assurer une détection d'arcs électriques et d'éviter que de tels arcs ne se propagent en aval du dispositif de détection. L'invention a pour objet un dispositif amélioré de détection de défauts dans un réseau alternatif capable, de manière générale, d'assurer une détection tant de discontinuité que de défaut à la terre. L'invention a donc pour objet un dispositif de détection d'un défaut électrique dans un réseau alternatif, comprenant un circuit de mesure apte à élaborer, pour chaque phase, un courant de mesure représentatif du courant circulant dans ladite phase et à élaborer une tension représentative de la somme des courants de mesure, et des moyens pour comparer ladite tension avec au moins une valeur de seuil de détection de défaut. A particularly interesting application of the invention relates to the detection of electrical faults in an AC network on board an aircraft. For example, for such an application, the detection of a fault uses current transformers providing continuous monitoring of the phase currents. When the difference between the phase currents where the value of each phase current exceeds respective threshold values, a relay is opened to prevent the fault from propagating. A known detection device of this type is for example described in document US Pat. No. 7,023,196. In this document, it is essentially a question of ensuring the detection of electric arcs and of avoiding that such arcs propagate downstream of the detection device. The invention relates to an improved device for detecting faults in an alternating network capable, in general, of ensuring detection of both discontinuity and ground fault. The subject of the invention is therefore a device for detecting an electrical fault in an alternating network, comprising a measurement circuit capable of producing, for each phase, a measuring current representative of the current flowing in said phase and of developing a voltage representative of the sum of the measurement currents, and means for comparing said voltage with at least one fault detection threshold value.
Dans un mode de réalisation, le circuit de mesure comprend, pour chaque phase, un transformateur de courant dont le primaire est associé à la phase et dont le secondaire délivre ledit courant de mesure. In one embodiment, the measurement circuit comprises, for each phase, a current transformer whose primary is associated with the phase and whose secondary delivers said measurement current.
Par exemple, le secondaire du transformateur est relié à un noeud commun audit transformateur. Le dispositif peut en outre comporter une résistance de mesure raccordée entre ledit noeud et la masse. Dans un mode de réalisation, ladite tension est comparée à une première valeur de seuil comprise 20 R/n et 100 R/n volts, préférablement entre 40 R/n et 70 R/n volts, R étant la valeur de la résistance de mesure et n étant le nombre de spires du secondaire du transformateur. Par exemple, la première valeur de seuil comprend une durée de 20 à 300 millisecondes, de préférence comprise entre 50 et 200 millisecondes. On peut également comparer ladite tension avec une deuxième valeur de seuil pour générer une deuxième alarme de contact à la masse. For example, the secondary of the transformer is connected to a node common to said transformer. The device may further comprise a measurement resistor connected between said node and the ground. In one embodiment, said voltage is compared with a first threshold value of between 20 R / n and 100 R / n volts, preferably between 40 R / n and 70 R / n volts, where R is the value of the measurement resistance. and n being the number of turns of the secondary of the transformer. For example, the first threshold value comprises a duration of 20 to 300 milliseconds, preferably between 50 and 200 milliseconds. It is also possible to compare said voltage with a second threshold value to generate a second ground contact alarm.
Par exemple, cette deuxième valeur de seuil est comprise entre R/n et 10 R/n volts, R étant la valeur de la résistance de mesure en ohms, et n étant le nombre de spires du secondaire du transformateur. Cette deuxième valeur de seuil peut également comprendre une durée de 10 à 60 secondes. For example, this second threshold value is between R / n and 10 R / n volts, where R is the value of the measurement resistor in ohms, and n is the number of turns of the secondary of the transformer. This second threshold value may also include a duration of 10 to 60 seconds.
L'invention a également pour objet, selon un autre aspect, un réseau électrique alternatif, embarqué à bord d'un aéronef, caractérisé en ce qu'il comprend un dispositif tel que défini ci-dessus. D'autres buts, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés, sur lesquels : - la figure 1 illustre l'architecture générale d'un dispositif de détection conforme à l'invention ; - la figure 2 illustre l'agencement du primaire de chaque transformateur ; - la figure 3 est une courbe illustrant un résultat de mesure en l'absence de dysfonctionnement ; et - la figure 4 montre un résultat de mesure en présence d'une composante continue. Sur la figure 1, on a représenté l'architecture générale d'un dispositif de détection de défaut pour réseau alternatif d'alimentation triphasé, désigné par la référence numérique générale 1. The subject of the invention is also, according to another aspect, an alternative electrical network, on board an aircraft, characterized in that it comprises a device as defined above. Other objects, features and advantages of the invention will become apparent on reading the following description, given solely by way of nonlimiting example, and with reference to the appended drawings, in which: FIG. 1 illustrates the architecture general of a detection device according to the invention; FIG. 2 illustrates the arrangement of the primary of each transformer; FIG. 3 is a curve illustrating a measurement result in the absence of a malfunction; and FIG. 4 shows a measurement result in the presence of a DC component. FIG. 1 shows the general architecture of a fault detection device for AC three-phase supply network designated by the general reference numeral 1.
Sur cette figure, on reconnaît les phases P1, P2 et P3 du réseau. Par exemple, le réseau P1, P2, P3 est constitué par un réseau de bord d'un aéronef destiné à assurer l'alimentation en énergie électrique de l'ensemble des équipements et dispositifs embarqués à bord de l'aéronef. In this figure, the phases P1, P2 and P3 of the network are recognized. For example, the network P1, P2, P3 is constituted by an aircraft onboard network intended to supply electrical energy to all the equipment and devices on board the aircraft.
Mais on notera toutefois que l'on ne sort pas du cadre de l'invention lorsque le réseau surveillé est constitué par tout autre type de réseau alternatif, triphasé ou, de manière générale, polyphasé. Comme on le voit, le dispositif 1 est basé sur une mesure du courant circulant dans chaque phase P1, P2 et P3 au moyen de transformateurs de mesure T1, T2 et T3, sur une sommation des courants de mesure délivrés par les transformateurs et l'élaboration d'une tension image de la somme de ces courants, de manière à vérifier si la composante est nulle ou, au contraire, dépasse une valeur de seuil résultant d'un déséquilibre entre les phases. However, it should be noted that it is not outside the scope of the invention when the monitored network is constituted by any other type of AC network, three-phase or, in general, polyphase. As can be seen, the device 1 is based on a measurement of the current flowing in each phase P1, P2 and P3 by means of measuring transformers T1, T2 and T3, on a summation of the measurement currents delivered by the transformers and the developing an image voltage of the sum of these currents, so as to verify whether the component is zero or, on the contrary, exceeds a threshold value resulting from an imbalance between the phases.
En se référant à la figure 2, chaque transformateur T1, T2 et T3 comporte un primaire E1 dont l'enroulement comporte une unique spire entourant l'une des phases, ici la phase P1. L'enroulement E2 secondaire est constitué par un enroulement comprenant n spires bobinées autour de l'enroulement primaire E1. Referring to Figure 2, each transformer T1, T2 and T3 comprises a primary E1 whose winding comprises a single turn surrounding one of the phases, here phase P1. The secondary winding E2 is constituted by a winding comprising n turns wound around the primary winding E1.
Ainsi, le courant I1, I2 et I3 circulant dans chaque phase P1, P2 et P3 est transformé en un courant de mesure i1, i2 et i3 de sorte que chaque courant de mesure ii est relié à un courant de phase I; par la relation suivante : Ii i~ _ n Thus, the current I1, I2 and I3 flowing in each phase P1, P2 and P3 is converted into a measurement current i1, i2 and i3 so that each measurement current ii is connected to a current of phase I; by the following relation: Ii i ~ _ n
dans laquelle n désigne le nombre de spires de chaque enroulement. in which n denotes the number of turns of each winding.
Par exemple, dans un mode de mise en oeuvre, n peut être compris entre 1000 et 3000. For example, in one embodiment, n can be between 1000 and 3000.
On voit en outre sur la figure 1, que le secondaire de chaque transformateur de mesure Ti, T2 ou T3 est associé à une résistance R1, R2 et R3 permettant d'élaborer, à partir des courants de mesure I1, I2 et I3 des tensions Vi, V2 et V3, images des courants de mesure. FIG. 1 also shows that the secondary of each measuring transformer Ti, T2 or T3 is associated with a resistor R1, R2 and R3 making it possible to develop voltages from the measurement currents I1, I2 and I3. Vi, V2 and V3, images of measurement currents.
Par ailleurs, on voit sur cette figure 2 que les secondaires sont reliés à un noeud commun N au niveau duquel les courants de mesure i1, i2 et i3 sont sommés. Furthermore, we see in this Figure 2 that the secondary are connected to a common node N at which the measuring currents i1, i2 and i3 are summed.
Le noeud N est relié à la masse par l'intermédiaire d'une résistance de mesure R. The node N is connected to ground via a measurement resistor R.
Le noeud N constitue un point de mesure au niveau duquel la tension de mesure V4, qui constitue une image de la somme des courants de mesure, peut être mesurée de manière à détecter un déséquilibre entre les phases. The node N constitutes a measuring point at which the measuring voltage V4, which is an image of the sum of the measurement currents, can be measured so as to detect an imbalance between the phases.
Le dispositif de détection est ainsi complété par des moyens logiciels et matériels permettant d'assurer une comparaison de la tension V4 avec des valeurs de seuil, comme décrit ci-après. S'il est détecté que la tension V4 au niveau du noeud N devient positive, non nulles, les phases sont déséquilibrées. The detection device is thus completed by software and hardware means to ensure a comparison of the voltage V4 with threshold values, as described below. If it is detected that the voltage V4 at the node N becomes positive, non-zero, the phases are unbalanced.
Au contraire, si la tension au niveau du noeud N est nulle, le déphasage entre les phases est constant et les amplitudes sont égales. On the contrary, if the voltage at the node N is zero, the phase shift between the phases is constant and the amplitudes are equal.
En effet, en se référant à la figure 3, en l'absence de dysfonctionnement, la valeur moyenne du courant de mesure ii en fonction du courant de phase I; est nulle. Indeed, with reference to FIG. 3, in the absence of a malfunction, the average value of the measurement current ii as a function of the phase I current; is zero.
Au contraire, en cas de dysfonctionnement, s'il apparaît une composante continue, il se produit une altération de la forme d'onde de manière non symétrique, ce qui entraîne l'apparition d'une résultante non nulle au point de mesure N. On the other hand, in the event of a malfunction, if a continuous component appears, an unbalanced alteration of the waveform occurs, resulting in the appearance of a non-zero resultant at the measuring point N.
En effet, s'il apparaît une composante continue, comme visible sur la figure 4, il apparaît un décalage des cycles d'hystérésis. Le signal sinusoïdal du courant de mesure est en effet déplacé en translation jusqu'à ce qu'apparaisse une non-linéarité entre le courant et le champ magnétique du transformateur, ce qui altère le signal de mesure et engendre une résultante non nulle. Par exemple, la tension V4 est comparée à une première valeur de seuil, comprise entre 20 R/n et 100 R/n en volts, de préférence comprise entre 40 R/n et 70 R/n volts, R étant la valeur de la résistance de mesure en ohms, et n étant le nombre de spires du secondaire du transformateur. Par exemple, la valeur de la résistance R est fixée à 100 ohms (n= 1000 tours). Ainsi, de préférence, la première valeur de seuil est par exemple comprise entre 2 et 10 volts. On peut également vérifier que le dysfonctionnement apparaît pendant une période de temps prédéterminée. Par exemple, on émet un signal de dysfonctionnement si la tension dépasse la première valeur de seuil pendant une durée de l'ordre de 20 à 300 millisecondes, de préférence entre 50 et 200 millisecondes. Pour la détection d'un défaut à la terre, on peut également comparer la tension au noeud N avec une valeur de seuil par exemple comprise entre R/n et 10 R/n volts, par exemple comprise entre 0,1 et 1 volt. On peut également surveiller que ce défaut à la terre apparaît pendant une durée comprise entre 10 et 60 secondes pour engendrer un signal de détection de défaut à la terre. Indeed, if a continuous component appears, as can be seen in FIG. 4, an offset of the hysteresis cycles appears. The sinusoidal signal of the measuring current is indeed displaced in translation until a non-linearity appears between the current and the magnetic field of the transformer, which alters the measurement signal and generates a non-zero resultant. For example, the voltage V4 is compared with a first threshold value between 20 R / n and 100 R / n in volts, preferably between 40 R / n and 70 R / n volts, where R is the value of measuring resistance in ohms, and n being the number of turns of the secondary of the transformer. For example, the value of the resistor R is set at 100 ohms (n = 1000 turns). Thus, preferably, the first threshold value is for example between 2 and 10 volts. It can also be verified that the malfunction occurs for a predetermined period of time. For example, a malfunction signal is emitted if the voltage exceeds the first threshold value for a duration of the order of 20 to 300 milliseconds, preferably between 50 and 200 milliseconds. For the detection of a ground fault, it is also possible to compare the voltage at the node N with a threshold value for example between R / n and 10 R / n volts, for example between 0.1 and 1 volt. It can also be monitored that this ground fault occurs for a period of between 10 and 60 seconds to generate a ground fault detection signal.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0852463A FR2930041B1 (en) | 2008-04-11 | 2008-04-11 | DEVICE FOR DETECTING AN ELECTRICAL FAULT IN AN ALTERNATIVE NETWORK. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0852463A FR2930041B1 (en) | 2008-04-11 | 2008-04-11 | DEVICE FOR DETECTING AN ELECTRICAL FAULT IN AN ALTERNATIVE NETWORK. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2930041A1 true FR2930041A1 (en) | 2009-10-16 |
| FR2930041B1 FR2930041B1 (en) | 2010-07-30 |
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ID=40085661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0852463A Active FR2930041B1 (en) | 2008-04-11 | 2008-04-11 | DEVICE FOR DETECTING AN ELECTRICAL FAULT IN AN ALTERNATIVE NETWORK. |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2930041B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3118185A1 (en) * | 2020-12-21 | 2022-06-24 | Safran Electronics & Defense | TRANSMISSION LINE MONITORING |
| FR3118184A1 (en) * | 2020-12-21 | 2022-06-24 | Safran Electronics & Defense | TRANSMISSION LINE MONITORING |
| CN115219852A (en) * | 2022-09-19 | 2022-10-21 | 国网江西省电力有限公司电力科学研究院 | Intelligent fault studying and judging method for distribution line of unmanned aerial vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148087A (en) * | 1977-04-20 | 1979-04-03 | Phadke Arun G | Distance relay for electric power transmission lines |
| EP0079504A1 (en) * | 1981-11-13 | 1983-05-25 | Westinghouse Electric Corporation | Protective relaying methods and apparatus |
| FR2671635A1 (en) * | 1991-01-10 | 1992-07-17 | Soule Sa | System for analysing fault currents on overhead lines, particularly medium voltage overhead lines |
| US7023196B2 (en) * | 2003-12-12 | 2006-04-04 | Leach International Corporation | High level arc fault detector |
-
2008
- 2008-04-11 FR FR0852463A patent/FR2930041B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148087A (en) * | 1977-04-20 | 1979-04-03 | Phadke Arun G | Distance relay for electric power transmission lines |
| EP0079504A1 (en) * | 1981-11-13 | 1983-05-25 | Westinghouse Electric Corporation | Protective relaying methods and apparatus |
| FR2671635A1 (en) * | 1991-01-10 | 1992-07-17 | Soule Sa | System for analysing fault currents on overhead lines, particularly medium voltage overhead lines |
| US7023196B2 (en) * | 2003-12-12 | 2006-04-04 | Leach International Corporation | High level arc fault detector |
Non-Patent Citations (1)
| Title |
|---|
| JOHN P NELSON: "System Grounding and Ground-Fault Protection in the Petrochemical Industry: A Need for aBetter Understanding", IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 38, no. 6, 1 November 2002 (2002-11-01), XP011073577, ISSN: 0093-9994 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3118185A1 (en) * | 2020-12-21 | 2022-06-24 | Safran Electronics & Defense | TRANSMISSION LINE MONITORING |
| FR3118184A1 (en) * | 2020-12-21 | 2022-06-24 | Safran Electronics & Defense | TRANSMISSION LINE MONITORING |
| WO2022136783A1 (en) * | 2020-12-21 | 2022-06-30 | Safran Electronics & Defense | Monitoring of a transmission line |
| CN115219852A (en) * | 2022-09-19 | 2022-10-21 | 国网江西省电力有限公司电力科学研究院 | Intelligent fault studying and judging method for distribution line of unmanned aerial vehicle |
| CN115219852B (en) * | 2022-09-19 | 2023-03-24 | 国网江西省电力有限公司电力科学研究院 | Intelligent fault studying and judging method for distribution line of unmanned aerial vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2930041B1 (en) | 2010-07-30 |
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