WO2009073995A1 - Dispositif d'eclairage pour la verification de panneaux photovoltaïques - Google Patents
Dispositif d'eclairage pour la verification de panneaux photovoltaïques Download PDFInfo
- Publication number
- WO2009073995A1 WO2009073995A1 PCT/CH2008/000518 CH2008000518W WO2009073995A1 WO 2009073995 A1 WO2009073995 A1 WO 2009073995A1 CH 2008000518 W CH2008000518 W CH 2008000518W WO 2009073995 A1 WO2009073995 A1 WO 2009073995A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mirror
- mirrors
- rays
- photovoltaic
- cells
- Prior art date
Links
- 238000012795 verification Methods 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0448—Adjustable, e.g. focussing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/006—Solar simulators, e.g. for testing photovoltaic panels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0214—Constructional arrangements for removing stray light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0414—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using plane or convex mirrors, parallel phase plates, or plane beam-splitters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/06—Restricting the angle of incident light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/08—Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/063—Illuminating optical parts
- G01N2201/0636—Reflectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to the field of devices for verifying the effectiveness of cells constituting a photo voltaic panel. More particularly, the invention relates to the field of such devices for concentrating photo voltaic panels, that is to say in which the photovoltaic cells are of reduced dimensions, and on which the light is concentrated by means of elements. which may be, for example, lenses placed in front of said cells or mirrors. Concentrations of 100 to 1000 times are usual. For equivalent power, it reduces in the same proportion the amount of material for making the solar cells.
- Verification of the operation of such devices presents some particular difficulties. The most important of them is that the light rays must reach perpendicularly, to a few degrees, on each of the cells, so as to reproduce the parallelism of the solar rays. In the test devices, the light source is obviously artificial and the emitted rays diverge. To obtain such a parallelism, a conventional solution consists in using a parabolic mirror whose property is precisely to return parallel divergent light rays from its home. However, the realization of large parabolic mirrors is a difficult operation.
- the usual technique consists in isolating the beam intended for each cell by means of a tube or a tunnel.
- the use of such a method involves a number of tubes identical to the number of cells to be tested; Since these tubes must be long enough, their number necessarily entails a considerable increase in the size of the device.
- the present invention aims to provide a device for verifying the operation of photovoltaic panels composed of several different photovoltaic cells, by bringing on each of these cells substantially parallel rays though emanating from one and the same focus, while avoiding the construction of a large parabolic mirror.
- the invention further aims to allow an individual adjustment of the intensity and direction of rays that strike each cell.
- the present invention further aims to provide a device that prevents the rays intended for a cell from reaching another cell, without the use of tubes or tunnels.
- the lighting device for the verification of the operation of photovoltaic panels comprising several photovoltaic cells is characterized in that it comprises several mirrors arranged in a substantially parabolic manner, so that each mirror returns the light coming from a single source towards a determined photovoltaic cell (4).
- the device is characterized in that at least one mirror is orientable.
- the device is characterized in that at least one mirror is flat.
- the device is characterized in that at least one mirror is mounted on a system able to adjust the distance between said mirror and the panel cell (s) to be illuminated.
- the device is characterized in that the distance adjustment system on which the mirror is mounted comprises at least a sliding axis and means for locking said axis in the desired position.
- the device is characterized in that one or more transverse covers are interposed between the mirrors and the photovoltaic cells to check, each cache having one or more days able to let the rays coming from said mirrors to the photovoltaic cells to which they are intended, the covers being shaped and arranged so that undesirable rays are prevented from reaching photovoltaic cells to which they are not intended.
- the invention finally comprises the use of a device as described above, according to its general form or in one of the particular embodiments described above, for the verification of photovoltaic panels comprising at least one suitable element. concentrating light from the mirror on a photovoltaic panel cell.
- Figure 1 is a schematic representation, seen from above, of a portion of a device according to the invention, in a first embodiment, showing the arrangement of the mirrors and cells.
- FIG. 2 is a representation similar to that of FIG. 1, in a second embodiment of the invention, in which transverse caches have been added, and which is the preferred embodiment.
- the device according to the invention comprises a light source 1 and mirrors 2.
- the mirrors are fixed on axes 6, themselves fixed on a support 3.
- the mirrors 2 are arranged in a substantially parabolic curve.
- the rays 9 emitted by the light source 1 hit the mirrors 2, which send rays 10 in the direction of the photovoltaic cells 5 which are fixed on the panel. Due to the parabola arrangement of the mirrors 2, the reflected rays 10 are returned substantially parallel to the photovoltaic cells.
- Each mirror is assigned to a cell.
- the mirrors are mounted on their axes 6 so as to be oriented, which allows fine adjustment of their orientation.
- the shafts 6 are mounted on the support 3 so as to slide in both directions, in the direction of the cell to be illuminated, as indicated by the double arrow 5. The user can thus adjust the distance between the mirror of the cell, which allows to finely adjust the light intensity striking the cell.
- the means for locking the mirrors 2 and the shafts 6 in a chosen position are not shown. It can be any known system, such as locking screws.
- each mirror should be given a parabolic curvature corresponding to the parabola according to which the mirrors are placed.
- the rays 10 would be exactly parallel. If the manufacture and installation of a series of such small parabolic mirrors are technically not impossible, they would however require a long time and therefore high costs. In practice it is preferable to be satisfied with a series of flat mirrors. Of course, in this case, only the rays 10 which are reflected by the central part of each mirror are really parallel. The rays 10 that come from non-central areas necessarily diverge. This divergence is however not important enough to have really sensitive effects on the tests.
- undesirable diverging rays 7, which may emanate from the edges of a mirror, should not be allowed to reach a cell adjacent to the target cell, and to which the spoke is not intended.
- the conventional technique is to enclose the rays that go to the cells in tubes or tunnels whose side walls are obstructing any ray that would go to a cell to which it is not intended.
- a multiplicity of such tubes or tunnels causes excessive space and weight.
- one or more covers 8 are interposed between the mirrors 2 and the photovoltaic cells 4 to be tested.
- the covers 8 are simple perforated plates. The rays for the cells pass through the days 11, while the undesirable and divergent rays 7 are stopped by the opaque walls of the caches.
- the device according to the invention is particularly useful in the verification of photovoltaic panels comprising several lenses which concentrate the light coming from the mirrors onto the cells.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Photovoltaic Devices (AREA)
Abstract
Ce dispositif pour la vérification du fonctionnement de panneaux photovoltaïques comprenant plusieurs cellules photovoltaïques (4) comprend plusieurs miroirs (2) disposés de manière sensiblement parabolique. Chaque miroir frappé par les rayons (9) émis par la source de lumière (1) émet des rayons (10) sensiblement parallèles en direction des cellules photovoltaïques (4) à tester. Les miroirs sont montés sur des axes (6) coulissant dans un support (3), ce qui permet d'ajuster la distance entre les miroirs et les cellules pour régler l'intensité de la lumière. Des caches (8) permettent d'éviter que les rayons indésirables (7) divergents atteignent des cellules adjacentes auxquelles ils ne sont pas destinés.
Description
DISPOSITIF D'ECLAIRAGE POUR LA VERIFICATION DE PANNEAUX PHOTOVOLTAÏQUES
Domaine technique
La présente invention se rapporte au domaine des dispositifs destinés à vérifier l'efficacité de cellules constituant un panneau photo voltaïque. Plus particulièrement, l'invention concerne le domaine de tels dispositifs destinés à des panneaux photo voltaïques à concentration, c'est-à-dire dans lesquels les cellules photovoltaïques sont de dimensions réduites, et sur lesquelles la lumière est concentrée au moyen d'éléments qui peuvent être, par exemple, des lentilles placées devant lesdites cellules ou des miroirs. Des concentrations de 100 à 1000 fois sont usuelles. Pour une puissance équivalente, cela permet de diminuer dans la même proportion la quantité de matériau destiné à réaliser les cellules solaires.
Technique antérieure
La vérification du fonctionnement de tels dispositifs présente quelques difficultés particulières. La plus importante d'entre elles est que les rayons lumineux doivent parvenir perpendiculairement, à quelques degrés près, sur chacune des cellules, de façon à reproduire le parallélisme des rayons solaires. Dans les dispositifs de test, la source de lumière est évidemment artificielle et les rayons émis divergent. Pour obtenir un tel parallélisme, une solution classique consiste à utiliser un miroir parabolique dont la propriété est justement de renvoyer parallèlement les rayons lumineux divergents issus de son foyer. Or, la réalisation de grands miroirs paraboliques est une opération difficile.
Selon la technique actuellement connue, il n'y a pas de moyens de régler individuellement les paramètres des rayons frappant chaque cellule.
En outre, pour éviter qu'une cellule ne soit atteinte par des rayons destinés à une autre cellule, la technique habituelle consiste à isoler le faisceau destiné à chaque cellule au moyen d'un tube ou d'un tunnel. L'utilisation d'un tel procédé implique un nombre de tubes identique au nombre de cellules à tester ; or, comme ces tubes doivent être assez longs, leur nombre entraîne nécessairement un alourdissement considérable du dispositif.
La présente invention vise à fournir un dispositif de vérification du fonctionnement de panneaux photovoltaïques composés de plusieurs cellules photovoltaïques distinctes, en amenant sur chacune de ces cellules des rayons sensiblement parallèles quoique émanant d'un seul et même foyer, en évitant cependant la construction d'un miroir parabolique de grandes dimensions.
L'invention vise de plus à permettre un ajustement individuel de l'intensité et de la direction des rayons qui frappent chaque cellule.
La présente invention vise en outre à fournir un dispositif qui empêche les rayons destinés à une cellule d'atteindre une autre cellule, sans recourir à des tubes ou tunnels.
Exposé de l'invention
Dans sa forme générale, le dispositif d'éclairage pour la vérification du fonctionnement de panneaux photovoltaïques comprenant plusieurs cellules photovoltaïques, selon l'invention, est caractérisé en ce qu'il comprend plusieurs miroirs disposés de manière sensiblement parabolique, de manière que chaque miroir renvoie la lumière provenant d'une source unique en direction d'une cellule photo voltaïque (4) déterminée.
Dans une première forme particulière d'exécution de l'invention, le dispositif est caractérisé en ce qu'au moins un miroir est orientable.
Dans une deuxième forme particulière d'exécution de l'invention, applicable à la forme générale et à la première forme particulière d'exécution, le dispositif est caractérisé en ce qu'au moins un miroir est plat.
Dans une troisième forme particulière d'exécution de l'invention, applicable à la forme générale et aux précédentes formes particulières d'exécution, le dispositif est caractérisé en ce qu'au moins un miroir est monté sur un système apte à régler la distance entre ledit miroir et la ou les cellules du panneau à éclairer.
Dans une quatrième forme particulière d'exécution de l'invention, applicable à la forme générale et aux précédentes formes particulières d'exécution, le dispositif est caractérisé en ce que le système de réglage de la distance sur lequel est monté le miroir comprend au moins un axe coulissant et des moyens de bloquer ledit axe dans la position désirée.
Dans une cinquième forme particulière d'exécution de l'invention, applicable à la forme générale et aux précédentes formes particulières d'exécution, le dispositif est caractérisé en ce qu'un ou plusieurs caches transversaux sont intercalés entre les miroirs et les cellules photovoltaïques à vérifier, chaque cache présentant un ou plusieurs jours aptes à laisser passer les rayons provenant desdits miroirs jusqu'aux cellules photovoltaïques auxquelles ils sont destinés, les caches étant conformés et disposés de manière que les rayons indésirables soient empêchés d'atteindre des cellules photovoltaïques auxquelles ils ne sont pas destinés.
L'invention comprend enfin l'utilisation d'un dispositif tel que décrit plus haut, selon sa forme générale ou dans l'une des formes particulières d'exécution décrites ci-dessus, pour la vérification de panneaux photovoltaïques comprenant au moins un élément apte à concentrer la lumière provenant du miroir sur une cellule photovoltaïque du panneau.
Description sommaire des dessins
Les dessins représentent, à titre d'exemples, deux formes d'exécution de l'invention.
La figure 1 est une représentation schématique, vue de dessus, d'une partie d'un dispositif selon l'invention, dans une première forme d'exécution, montrant la disposition des miroirs et des cellules.
La figure 2 est une représentation analogue à celle de la figure 1, dans une deuxième forme d'exécution de l'invention, dans laquelle des caches transversaux ont été ajoutés, et qui est la forme d'exécution préférée.
Meilleure manière de réaliser l'invention
Le dispositif selon l'invention comprend une source de lumière 1 et des miroirs 2. Les miroirs sont fixés sur des axes 6, eux-mêmes fixés sur un support 3. Les miroirs 2 sont disposés selon une courbe sensiblement parabolique. Les rayons 9 émis par la source lumineuse 1 frappent les miroirs 2, qui renvoient des rayons 10 en direction des cellules photovoltaïques 5 qui sont fixées sur le panneau. En raison de la disposition en parabole des miroirs 2, les rayons reflétés 10 sont renvoyés de manière sensiblement parallèle vers les cellules photovoltaïques. Chaque miroir est affecté à une cellule.
Les miroirs sont montés sur leurs axes 6 de façon à pouvoir être orientés, ce qui permet d'ajuster finement leur orientation.
De plus, les axes 6 sont montés sur le support 3 de façon à pouvoir coulisser dans les deux sens, dans la direction de la cellule à éclairer, comme l'indique la double flèche 5. L'utilisateur peut ainsi ajuster la distance séparant le miroir de la cellule, ce qui permet de régler finement l'intensité lumineuse frappant la cellule. Les moyens de bloquer les miroirs 2 et les axes 6 dans une position choisie ne sont pas représentés. Il peut s'agir de n'importe quel système connu, comme des vis de blocage.
Idéalement, il conviendrait de donner à chaque miroir une courbure parabolique correspondant à la parabole selon laquelle les miroirs sont placés. De la sorte, en théorie, les rayons 10 seraient exactement parallèles.
Si la fabrication et la pose d'une série de tels petits miroirs paraboliques n'ont techniquement rien d'impossible, elles exigeraient cependant un temps assez long et par conséquent des coûts élevés. Il est en pratique préférable de se contenter d'une série de miroirs plats. Bien entendu, dans ce cas, seuls les rayons 10 qui sont reflétés par la partie centrale de chaque miroir sont vraiment parallèles. Les rayons 10 qui proviennent de zones non centrales divergent nécessairement. Cette divergence n'est cependant pas suffisamment importante pour avoir des effets vraiment sensibles sur les tests.
Néanmoins, il convient d'éviter que des rayons divergents indésirables 7, qui peuvent émaner des bords d'un miroir, n'atteignent une cellule adjacente à la cellule visée, et à laquelle le rayon n'est pas destiné.
A cet effet, la technique classique consiste à enfermer les rayons qui se dirigent vers les cellules dans des tubes ou tunnels dont les parois latérales font obstacle à tout rayon qui se dirigerait vers une cellule à laquelle il n'est pas destiné. Comme on l'a vu, une multiplicité de tels tubes ou tunnels entraîne un encombrement et un poids excessifs.
Pour éviter cette solution lourde, un ou plusieurs caches 8 sont intercalés entre les miroirs 2 et les cellules photovoltaïques 4 à tester. Les caches 8 sont de simples plaques ajourées. Les rayons 10 destinés aux cellules passent à travers les jours 11, alors que les rayons indésirables et divergents 7 sont arrêtés par les parois opaques des caches.
Possibilités d'application industrielle
Le dispositif selon l'invention est particulièrement utile dans la vérification de panneaux photovoltaïques comprenant plusieurs lentilles qui concentrent la lumière provenant des miroirs sur les cellules.
Claims
1. Dispositif d'éclairage pour la vérification du fonctionnement de panneaux photovoltaïques comprenant plusieurs cellules photo voltaïques (4), caractérisé en ce qu'il comprend plusieurs miroirs (2) disposés de manière sensiblement parabolique, de manière que chaque miroir renvoie la lumière provenant d'une source unique (1) en direction d'une cellule photovoltaïque (4) déterminée.
2. Dispositif selon la revendication 1, caractérisé en ce qu'au moins un miroir est orientable.
3. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce qu'au moins un miroir est plat.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce qu'au moins un miroir est monté sur un système apte à régler la distance entre ledit miroir et la ou les cellules du panneau à éclairer.
5. Dispositif selon la revendication 4, caractérisé en ce que le système de réglage de la distance sur lequel est monté le miroir comprend au moins un axe (6) coulissant et des moyens de bloquer ledit axe dans la position désirée.
6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce qu'un ou plusieurs caches (8) transversaux sont intercalés entre les miroirs (2) et les cellules photovoltaïques (4) à vérifier, chaque cache (8) présentant un ou plusieurs jours (11) aptes à laisser passer les rayons (10) provenant desdits miroirs jusqu'aux cellules photovoltaïques auxquelles ils sont destinés, les caches étant conformés et disposés de manière que les rayons indésirables (7) soient empêchés d'atteindre des cellules photovoltaïques (4) auxquelles ils ne sont pas destinés. Utilisation d'un dispositif selon l'une des revendications 1 à 6 pour la vérification de panneaux photovoltaïques comprenant au moins un élément apte à concentrer la lumière provenant du miroir sur une cellule photovoltaïque du panneau.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CH1913/07 | 2007-12-10 | ||
CH19132007 | 2007-12-10 |
Publications (1)
Publication Number | Publication Date |
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WO2009073995A1 true WO2009073995A1 (fr) | 2009-06-18 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/CH2008/000518 WO2009073995A1 (fr) | 2007-12-10 | 2008-12-04 | Dispositif d'eclairage pour la verification de panneaux photovoltaïques |
Country Status (2)
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TW (1) | TW200933777A (fr) |
WO (1) | WO2009073995A1 (fr) |
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CN111781407A (zh) * | 2020-07-03 | 2020-10-16 | 四川中迪电力工程有限公司 | 一种可多向调节的特高压变压器局放试验专用操作台 |
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