CA2011844A1 - Gas insulated combined current and voltage converter - Google Patents
Gas insulated combined current and voltage converterInfo
- Publication number
- CA2011844A1 CA2011844A1 CA 2011844 CA2011844A CA2011844A1 CA 2011844 A1 CA2011844 A1 CA 2011844A1 CA 2011844 CA2011844 CA 2011844 CA 2011844 A CA2011844 A CA 2011844A CA 2011844 A1 CA2011844 A1 CA 2011844A1
- Authority
- CA
- Canada
- Prior art keywords
- converter
- voltage
- current
- combined
- gas
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/34—Combined voltage and current transformers
- H01F38/36—Constructions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A gas-insulated combined current and voltage converter in an insulting casing with a pressure-proof insulator, totally enclosing the high-voltage and the low-voltage winding as well as the iron core of the voltage converter, is closed off so as to be gas-tight at its lower end by means of a base, which has at its upper end a supporting or mounting flange.
The converter avoids the complex shape of the current-converter housing and functions with the least possible number of sealed joints that are subject to pressure. The primary and the secondary windings and the iron core(s) of the voltage converter is/are arranged completely within the insulator. The supporting flange closes off the insulator completely at the top so as to render it gas-tight and at the same time functions as a carrier for the primary connectors and the gas-tight fairleads or passages for the high-voltage connectors for the current and voltage converter.
A gas-insulated combined current and voltage converter in an insulting casing with a pressure-proof insulator, totally enclosing the high-voltage and the low-voltage winding as well as the iron core of the voltage converter, is closed off so as to be gas-tight at its lower end by means of a base, which has at its upper end a supporting or mounting flange.
The converter avoids the complex shape of the current-converter housing and functions with the least possible number of sealed joints that are subject to pressure. The primary and the secondary windings and the iron core(s) of the voltage converter is/are arranged completely within the insulator. The supporting flange closes off the insulator completely at the top so as to render it gas-tight and at the same time functions as a carrier for the primary connectors and the gas-tight fairleads or passages for the high-voltage connectors for the current and voltage converter.
Description
~- 201~8~
, . ~
The present invention relates to a gas-insulated combined current and voltage converter, built as an insulting casing with a pressure-proof insulator which totally encloses the high-voltage and the low-voltage winding as well as the iron core of the voltage converter, and which is closed off at its lower end by means of a base so as to be gas-tight, and which ~ has at its upper end a supporting or mounting flange.
; DE-GM 18 89 457 describes a gas-insulated combined current ; and voltage converter of this type, in which the current converter is arranged above the insulator as a head assembly on a supporting flange. This current converter is surrounded by a metal housing of a complex shape and which has to be connected to the supporting flange so as to ensure a gas-tight seal in order to contain the insulating ~as that is contained within it under pressure. In addition, the insulated fairleads for running the primary line of the current converter through the metal housing must also be ; suitably gas-tight.
':, - DE-OS 14 88 279 describes an oil-insulated combined current and voltage converter with a common columnar insulating vessel for the active parts of the voltage converter, which are arranged one above the other, and of the current converter. Because the insulating vessel is filled with insulating oil, the upper end of the insulating vessel cannot be hermetically sealed, but is connected with an oil-` expansion vessel of known construction.
. .~ .
It is an object of the present invention to create a combined !,~', current and voltage converter of the type described in the introduction hereto and which, on the one hand, avoids the complex shape of the current-converter housing and, on the other hand, functions with the least possible number of sealed joints that are subject to pressure, this being done to reduce production costs and enhance the functional safety of this combined current and voltage converter.
.. .. .. .
: ,~ ". : : : , . . . . : : : . : :: ::
, . ~
The present invention relates to a gas-insulated combined current and voltage converter, built as an insulting casing with a pressure-proof insulator which totally encloses the high-voltage and the low-voltage winding as well as the iron core of the voltage converter, and which is closed off at its lower end by means of a base so as to be gas-tight, and which ~ has at its upper end a supporting or mounting flange.
; DE-GM 18 89 457 describes a gas-insulated combined current ; and voltage converter of this type, in which the current converter is arranged above the insulator as a head assembly on a supporting flange. This current converter is surrounded by a metal housing of a complex shape and which has to be connected to the supporting flange so as to ensure a gas-tight seal in order to contain the insulating ~as that is contained within it under pressure. In addition, the insulated fairleads for running the primary line of the current converter through the metal housing must also be ; suitably gas-tight.
':, - DE-OS 14 88 279 describes an oil-insulated combined current and voltage converter with a common columnar insulating vessel for the active parts of the voltage converter, which are arranged one above the other, and of the current converter. Because the insulating vessel is filled with insulating oil, the upper end of the insulating vessel cannot be hermetically sealed, but is connected with an oil-` expansion vessel of known construction.
. .~ .
It is an object of the present invention to create a combined !,~', current and voltage converter of the type described in the introduction hereto and which, on the one hand, avoids the complex shape of the current-converter housing and, on the other hand, functions with the least possible number of sealed joints that are subject to pressure, this being done to reduce production costs and enhance the functional safety of this combined current and voltage converter.
.. .. .. .
: ,~ ". : : : , . . . . : : : . : :: ::
2 ~
-According to the present invention there is provided a gas-insulated combined current and voltage converter constructed as an insulated casing with a pressure-proof insulator that totally encloses the high-voltage and the low-voltage winding, as well as the iron core of the voltage converter, and which is closed off so as to be gas-tight at the bottom by means of a base, and which is provided at the top with a supporting flange, wherein the primary and secondary windings : and the iron core(s) of the voltage converter is/are arranged completely within the insulator; and the supporting flange - closes off the insulator completely at the top so as to render it gas-tight and at the same time functions as a carrier for the primary connectors and the gas-tight fairleads or passages for the high-voltage connectors of the ~ 15 current and voltage converter.
:l The advantages achieved with the present invention are, in . particular, that the converter is in the form of a cylinder that consists, essentially, of a pipe-like insulator, the upper opening of which is completely sealed by means of a disk-like supporting flange and the lower opening of which is . completely closed off by means of a disk-like base, all the ~: fairleads for the electrical connections being passed only through the supporting flange and through the base. In this way, one achieves a low, compact structure, which increases ; 25 stability and permits the use of this combined current and `~ voltage converter in areas that are subject to earthquakes.
:,...
The invention will now be described in more detail, by way of : example only, with reference to the accompanying drawings in which~
Figure 1 shows a combined current and voltage converter . according to the present invention, in longitudinal cross-section as viewed from the side; :~
. Figure 2 shows the combined converter as in figure 1, viewed ~:
from above;
, ~
. :
2 ~
-, :
~, Figure 3 is a view of the current converter on the section line III-III in figure 1.
A combined current and voltage converter 1 is pressurized to the usual level by an inert gas such as sulfur he~afluoride.
This converter consists essentially of a cylindrical ~ -insulator 7 of porcelain, epoxy resin, or of a GFK pipe with moulded silicon ribs, and of a base 12 that seals off the insulator 7 at its lower end in such a way as to render it gas-tight and which supports the secondary system 5, 6 of the current converter 3 through a column 11, and of a supporting flange 8 that closes off the upper end of the insulator 7 so as to render it gas-tight and which supports the complete voltage converter 2, the primary conductor 4 of the current converter 3, fairleads 10 for the high voltage connectors of the current and voltage converter 3,2, and the primary connectors 9. Within the column 11 there is an outlet conductor pipe 22, through which the secondary outlet lines 21 of the current and voltage converter 3, 2 run to a terminal box 23 that is arranged beneath the base 12.
. , .
:.
The outlet conductor pipe 22 is inserted into a secondary i system of the current converter 3, which consists preferably ¦ of a plurality of annular cores 5 with associated secondary ;', windings 6 and a cast resin casing that forms a ring. This rests on a column 11 that comprises 4 metal supports 36 that are arranged in four quadrants and are mechanically connected to each other at the top by a metal plate 33. In principle, three metal supports 36 could also be set up in a triangular arrangement.
In order to make it possible to compensate for any various extensions of the lengths of the metal supports 36 of the column 11, such as could be caused by variations in the ~ ~-temperature caused during operation, and in order to simplify assembly of the secondary system 5, 6 of the current ` converter 3 on the outlet conductor pipe 22, the connection ~
':
-According to the present invention there is provided a gas-insulated combined current and voltage converter constructed as an insulated casing with a pressure-proof insulator that totally encloses the high-voltage and the low-voltage winding, as well as the iron core of the voltage converter, and which is closed off so as to be gas-tight at the bottom by means of a base, and which is provided at the top with a supporting flange, wherein the primary and secondary windings : and the iron core(s) of the voltage converter is/are arranged completely within the insulator; and the supporting flange - closes off the insulator completely at the top so as to render it gas-tight and at the same time functions as a carrier for the primary connectors and the gas-tight fairleads or passages for the high-voltage connectors of the ~ 15 current and voltage converter.
:l The advantages achieved with the present invention are, in . particular, that the converter is in the form of a cylinder that consists, essentially, of a pipe-like insulator, the upper opening of which is completely sealed by means of a disk-like supporting flange and the lower opening of which is . completely closed off by means of a disk-like base, all the ~: fairleads for the electrical connections being passed only through the supporting flange and through the base. In this way, one achieves a low, compact structure, which increases ; 25 stability and permits the use of this combined current and `~ voltage converter in areas that are subject to earthquakes.
:,...
The invention will now be described in more detail, by way of : example only, with reference to the accompanying drawings in which~
Figure 1 shows a combined current and voltage converter . according to the present invention, in longitudinal cross-section as viewed from the side; :~
. Figure 2 shows the combined converter as in figure 1, viewed ~:
from above;
, ~
. :
2 ~
-, :
~, Figure 3 is a view of the current converter on the section line III-III in figure 1.
A combined current and voltage converter 1 is pressurized to the usual level by an inert gas such as sulfur he~afluoride.
This converter consists essentially of a cylindrical ~ -insulator 7 of porcelain, epoxy resin, or of a GFK pipe with moulded silicon ribs, and of a base 12 that seals off the insulator 7 at its lower end in such a way as to render it gas-tight and which supports the secondary system 5, 6 of the current converter 3 through a column 11, and of a supporting flange 8 that closes off the upper end of the insulator 7 so as to render it gas-tight and which supports the complete voltage converter 2, the primary conductor 4 of the current converter 3, fairleads 10 for the high voltage connectors of the current and voltage converter 3,2, and the primary connectors 9. Within the column 11 there is an outlet conductor pipe 22, through which the secondary outlet lines 21 of the current and voltage converter 3, 2 run to a terminal box 23 that is arranged beneath the base 12.
. , .
:.
The outlet conductor pipe 22 is inserted into a secondary i system of the current converter 3, which consists preferably ¦ of a plurality of annular cores 5 with associated secondary ;', windings 6 and a cast resin casing that forms a ring. This rests on a column 11 that comprises 4 metal supports 36 that are arranged in four quadrants and are mechanically connected to each other at the top by a metal plate 33. In principle, three metal supports 36 could also be set up in a triangular arrangement.
In order to make it possible to compensate for any various extensions of the lengths of the metal supports 36 of the column 11, such as could be caused by variations in the ~ ~-temperature caused during operation, and in order to simplify assembly of the secondary system 5, 6 of the current ` converter 3 on the outlet conductor pipe 22, the connection ~
':
- 3 - ~
' ~
2011~
between the outlet conductor point 34 on the underside of the secondary system 5, 6 and the outlet conductor pipe 22 is formed mechanically as a longitudinally displaceable plug-type connection. The upper end of the outlet conductor pipe 22 is surrounded coa~ially and held flexibly in the manner of a sliding seating by one or a plurality of contact springs 35, for example, annular contact springs that are arranged in a ring about the outlet conductor pipe 22, preferably as a collar that incorporates a plurality of slits.
. .
The primary conductor 4 of the current converter 3 is U-shaped, the horizontal member 13 of this U passing coaxially through the opening 14 of the iron cores 5 and the secondary windings 6. The vertical arms of this U extend upwards to the supporting flange 8 and are secured to this. The primary conductor 4 consists of at least two parallel strands that are insulated from each other and which can be connected in parallel or in series, as desired, outside the converter housing. Figure 2 shows, from above, how a primary conductor consisting of four parallel strands that are insulated from ;~
each other is connected, for example, in series outside the converter housing, by the appropriate attachment of contact tabs 27, 28, 29, by using two semicircular return lines 30 as connecting lines between the strands.
Two of the angle pieces 31 that are attached to the supporting flange 8 each incorporate lifting eyes for crane hooks, with the help of which the supporting flange 8 and all the converter components attached thereto can be raised and lowered during assembly.
.
In addition, the supporting flange 8 supports the complete voltage converter 2 that is arranged between the vertical ~ arms 15 o~ the primary conductor 4 of the current converter ; 3. A screening electrode 19 that is at low-voltage ;- potential, and which surrounds the high-voltage and the low-voltage windings 17, 18 of the voltage converter 2, is ~ 4 ~
'~ ,, , ~; 2~1~8~
.
connected electrically to a metal or metallized casing 20 of the secondary widings 6 of the current converter 3; this casing 20 is also at low-voltage potential.
In order to simplify assembly, at the bottom of the voltage converter 2, which is to say in the direction of the current converter 3, there is a plug 24 of a multiple plug system (figure 3), to which its secondary lines are connected, whereas above the current converter 3 there is a corresponding coupling 25 of the multiple plug system. Thig makes it possible for the plug connector 24, 25 to be completed automatically when the supporting flange 8 is installed on the insulator 7. In order to compensate for . .
changes in axial length brought about by temperature or pressure variations, the plug-type connector 24, 25 permits an appropriate amount of axial free-play.
, , The secondary lines 21 from the coupling 25 to the outlet conductor pipe 22 are led downwards along a cast-resin casing that surrounds the secondary system 5, 6 of the current converter 3, or are moulded into said cast-resin casing.
:, `
At the bottom, the plug 24 is attached to or moulded onto a cast-resin body that surrounds the secondary system 17, 18 of the voltage converter 2.
., ' ~.
The iron core 16 of the voltage converter 2 is formed as a shell core and arranged so as to extend in a horizontal plane. This results in, amongst other things, in a low ;-~
structure. The attachment of the iron core 16 is effected directly on or through angle pieces on the supporting flange 8. Shields 26 are arranged on all internal surfaces of the iron core 16, and the ends of these that are proximate to the current ~onverter 3 are bowed or ballooned outwards. ~ -:
In order that the plug-type connector 24, 25 can be joined together at the precise angular position in the direction of rotation when the voltage converter is mounted, coding elements 37 are incorporated on the plug 24 and the coupling 25, as can be seen in figure 3. These elements are in the form of grooves and keys, or pins and drillings.
:' -~ 5 The iron core 5 of the voltage converter 3 consists of a plurality of annular cores that are arranged so as to be adjacent to each other, and which are provided with secondary ; windings; of these, one or a plurality can be used as measurement cores or for protective purposes.
: i In order to arrive at a favourable field distribution, the iron core 16 and the start of the lowest layer of the high-voltage coil 17 of the voltage converter 2 are at high-voltage potential, so that the potential of the individual layers of the high-voltage wingind 17 falls off to zero -~
- 15 towards the end of the upper layer. In addition, the secondary winding 18 that is fitted with the shielding '; electrode 19 is arranged above the uppermost layer of the high-voltage winding 17.
s In order to protect the complete converter 1 against the -~ 20 danger of explosion caused by unintended excessive pressure in the gas-tight interior space of the insulator 7, there is a burst disk incorporated in the supporting flange 8: this j; disk provides a gas-tight seal on a drilling 38 in the i`~ supporting flange 8. This drilling 38 also serves to provide access to the interior space during assembly, for example, in order to permit removal of assembly jigs from converter 1 ~
once the assembly process has been completed. ;
. . ~ -.
:"
.
`'' ' ~' :' , .
' ~
2011~
between the outlet conductor point 34 on the underside of the secondary system 5, 6 and the outlet conductor pipe 22 is formed mechanically as a longitudinally displaceable plug-type connection. The upper end of the outlet conductor pipe 22 is surrounded coa~ially and held flexibly in the manner of a sliding seating by one or a plurality of contact springs 35, for example, annular contact springs that are arranged in a ring about the outlet conductor pipe 22, preferably as a collar that incorporates a plurality of slits.
. .
The primary conductor 4 of the current converter 3 is U-shaped, the horizontal member 13 of this U passing coaxially through the opening 14 of the iron cores 5 and the secondary windings 6. The vertical arms of this U extend upwards to the supporting flange 8 and are secured to this. The primary conductor 4 consists of at least two parallel strands that are insulated from each other and which can be connected in parallel or in series, as desired, outside the converter housing. Figure 2 shows, from above, how a primary conductor consisting of four parallel strands that are insulated from ;~
each other is connected, for example, in series outside the converter housing, by the appropriate attachment of contact tabs 27, 28, 29, by using two semicircular return lines 30 as connecting lines between the strands.
Two of the angle pieces 31 that are attached to the supporting flange 8 each incorporate lifting eyes for crane hooks, with the help of which the supporting flange 8 and all the converter components attached thereto can be raised and lowered during assembly.
.
In addition, the supporting flange 8 supports the complete voltage converter 2 that is arranged between the vertical ~ arms 15 o~ the primary conductor 4 of the current converter ; 3. A screening electrode 19 that is at low-voltage ;- potential, and which surrounds the high-voltage and the low-voltage windings 17, 18 of the voltage converter 2, is ~ 4 ~
'~ ,, , ~; 2~1~8~
.
connected electrically to a metal or metallized casing 20 of the secondary widings 6 of the current converter 3; this casing 20 is also at low-voltage potential.
In order to simplify assembly, at the bottom of the voltage converter 2, which is to say in the direction of the current converter 3, there is a plug 24 of a multiple plug system (figure 3), to which its secondary lines are connected, whereas above the current converter 3 there is a corresponding coupling 25 of the multiple plug system. Thig makes it possible for the plug connector 24, 25 to be completed automatically when the supporting flange 8 is installed on the insulator 7. In order to compensate for . .
changes in axial length brought about by temperature or pressure variations, the plug-type connector 24, 25 permits an appropriate amount of axial free-play.
, , The secondary lines 21 from the coupling 25 to the outlet conductor pipe 22 are led downwards along a cast-resin casing that surrounds the secondary system 5, 6 of the current converter 3, or are moulded into said cast-resin casing.
:, `
At the bottom, the plug 24 is attached to or moulded onto a cast-resin body that surrounds the secondary system 17, 18 of the voltage converter 2.
., ' ~.
The iron core 16 of the voltage converter 2 is formed as a shell core and arranged so as to extend in a horizontal plane. This results in, amongst other things, in a low ;-~
structure. The attachment of the iron core 16 is effected directly on or through angle pieces on the supporting flange 8. Shields 26 are arranged on all internal surfaces of the iron core 16, and the ends of these that are proximate to the current ~onverter 3 are bowed or ballooned outwards. ~ -:
In order that the plug-type connector 24, 25 can be joined together at the precise angular position in the direction of rotation when the voltage converter is mounted, coding elements 37 are incorporated on the plug 24 and the coupling 25, as can be seen in figure 3. These elements are in the form of grooves and keys, or pins and drillings.
:' -~ 5 The iron core 5 of the voltage converter 3 consists of a plurality of annular cores that are arranged so as to be adjacent to each other, and which are provided with secondary ; windings; of these, one or a plurality can be used as measurement cores or for protective purposes.
: i In order to arrive at a favourable field distribution, the iron core 16 and the start of the lowest layer of the high-voltage coil 17 of the voltage converter 2 are at high-voltage potential, so that the potential of the individual layers of the high-voltage wingind 17 falls off to zero -~
- 15 towards the end of the upper layer. In addition, the secondary winding 18 that is fitted with the shielding '; electrode 19 is arranged above the uppermost layer of the high-voltage winding 17.
s In order to protect the complete converter 1 against the -~ 20 danger of explosion caused by unintended excessive pressure in the gas-tight interior space of the insulator 7, there is a burst disk incorporated in the supporting flange 8: this j; disk provides a gas-tight seal on a drilling 38 in the i`~ supporting flange 8. This drilling 38 also serves to provide access to the interior space during assembly, for example, in order to permit removal of assembly jigs from converter 1 ~
once the assembly process has been completed. ;
. . ~ -.
:"
.
`'' ' ~' :' , .
Claims (12)
1. A gas-insulated combined current and voltage converter constructed as an insulated casing with a pressure-proof insulator that totally encloses the high-voltage and the low-voltage winding, as well as the iron core of the voltage converter, and which is closed off so as to be gas-tight at the bottom by means of a base, and which is provided at the top with a supporting flange, wherein the primary and secondary windings and the iron core(s) of the voltage converter is/are arranged completely within the insulator;
and the supporting flange closes off the insulator completely at the top so as to render it gas-tight and at the same time functions as a carrier for the primary connectors and the gas-tight fairleads or passages for the high-voltage connectors of the current and voltage converter.
and the supporting flange closes off the insulator completely at the top so as to render it gas-tight and at the same time functions as a carrier for the primary connectors and the gas-tight fairleads or passages for the high-voltage connectors of the current and voltage converter.
2. A combined converter as claimed in claim 1, wherein the secondary windings including the iron core(s) of the current converter are supported on a column that is connected to the base.
3. A combined converter as claimed in claim 1, wherein the primary winding of the current converter that is configured as the primary conductor is U-shaped, the horizontal arm of this passing coaxially through the opening of the iron core(s) and the secondary windings of the current converter the vertical arms leading up to the supporting flange and being electrically connected to the high-voltage connectors.
4. A combined converter as claimed in claim 1, wherein the iron core and the high-voltage and the low-voltage windings of the voltage converter are secured above the current converter on the supporting flange.
5. A combined converter as claimed in claims 3 or 4, wherein the voltage converter is arranged between the vertical arms of the primary conductor of the current converter.
6. A combined converter as claimed in any one of claims 1 to 3, wherein a screening electrode of the voltage converter, which is at low-voltage potential, is electrically connected to a metal or metallized casing of the secondary windings of the current converter that is also at low-voltage potential.
7. A combined converter as claimed in any one of claims 1 to 3, wherein the secondary output lines of the voltage and current converter are led together through an outlet conductor pipe to a terminal box that is outside the base of the insulator.
8. A combined converter as claimed in any one of claims 1 to 3, wherein the secondary windings including the iron core(s) of the current converter, rest(s) on the column that is formed from three or four metal supports that are set up in a triangular or rectangular arrangement on the base and connected to each other mechanically at the top by a metal plate.
9. A combined converter as claimed in claim 1, wherein the connection between the outlet conductor point on the underside of the secondary system and the outlet conductor pipe is formed mechanically as a plug-type connection that can move longitudinally.
10. A combined converter as claimed in claim 9, wherein the upper end of the outlet conductor pipe is surrounded coaxially and retained elastically in the manner of a sliding seating by one or a plurality of contact springs.
11. A combined converter as claimed in claim 10, wherein the contact springs are annular contact springs arranged in a ring about the outlet conductor pipe.
12. A combined converter as claimed in claim 11, wherein the annular contact springs are arranged in a ring about the outlet conductor pipe as a collar with multiple slits.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8903069 | 1989-03-13 | ||
| DEG8903069.9 | 1989-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2011844A1 true CA2011844A1 (en) | 1990-09-13 |
Family
ID=6837046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2011844 Abandoned CA2011844A1 (en) | 1989-03-13 | 1990-03-09 | Gas insulated combined current and voltage converter |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2011844A1 (en) |
| FR (1) | FR2644283A1 (en) |
-
1990
- 1990-03-05 FR FR9002723A patent/FR2644283A1/en not_active Withdrawn
- 1990-03-09 CA CA 2011844 patent/CA2011844A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| FR2644283A1 (en) | 1990-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |