Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1985-11-01
1988-05-24
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
361385, 361121, H02H 7125
Patent
active
047470372
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a high-voltage thyristor conversion/inversion apparatus for use in an A.C.-D.C. converting/inverting station etc.
2. Background Art
FIG. 1 is a connection diagram of a high-voltage thyristor conversion/inversion apparatus to which this invention is directed, and by which alternating current supplied from A.C. buses (R), (S) and (T) is converted into direct current through bridge-connected valves (U)-(Z) or direct current supplied from D.C. buses (P) and (N) is inverted into alternating current. (LA1)-(LA6) indicate lightning arresters, which are connected in parallel with the bridge-connected valves (U)-(Z) in order to protect the respective valves (U)-(Z) from overvoltages.
Each of the valves (U)-(Z) constituting the high-voltage thyristor conversion/inversion apparatus is constructed in such a way that thyristor modules (SM), each of which comprises a plurality of thyristor elements (S1)-(Sn) as well as an anode reactor (AL) belonging thereto, and resistors and capacitors as shown in FIG. 2, are stacked in a required number by the use of insulating bars (B) as shown in FIG. 3.
FIG. 4 shows an example of the practicable arrangement of these thyristor valves in a prior art, and depicts a portion corresponding to three arms in a rectifier bridge which is composed of six arms of valves.
The valves (U), (V) and (W) constituting the bridge are respectively received in separate sealed tanks so as to be protected from dust in the air. These sealed tanks are often filled up with, ordinarily, an insulating oil or insulating gas in order to enhance an insulation performance. The A.C. buses (R), (S) and (T) and the D.C. bus (P) are connected to these valves, and the lightning arresters (LA1), (LA2) and (LA3) for protecting the valves are connected in parallel with the valves.
In the prior-art thyristor conversion/inversion apparatus wherein the individual valves (U), (V) and (W) constituting the bridge are received in the separate sealed tanks in this manner, the arrangement becomes large in size, and the A.C. buses and the D.C. buses intersect complicatedly, as illustrated in FIG. 4. These have been problems in reducing the area of the site of an A.C.-D.C. converting/inverting station still more.
DISCLOSURE OF THE INVENTION
This invention consists in constructing a high-voltage thyristor conversion/inversion apparatus in such a way that, among valves constituting a bridge, those of each portion corresponding to three arms, which are connected to a D.C. bus of identical sign, and lightning arresters which are connected in parallel with the respective valves, are received in a single sealed tank, thereby to reduce the size of the whole conversion/inversion apparatus. It has the effect that more reduction in the area of the site of an A.C.-D.C. converting/inverting station and simplification in the construction of the converting/inverting station can be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a connection diagram of a high-voltage thyristor conversion/inversion apparatus, FIG. 2 is a connection diagram of the thyristor module thereof,
FIG. 3 is a view of the internal setup of each valve,
FIG. 4 is an arrangement view of a high-voltage thyristor conversion/inversion apparatus in a prior art, and FIGS. 5, 6 and 7 are sectional views all showing a high-voltage thyristor conversion/inversion apparatus in one aspect of performance of this invention.
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 5 is a sectional view in which valves according to this invention are seen from below. Among valves constituting a bridge, those (U), (V) and (W) of a portion corresponding to three arms are collectively received in a cylindrical sealed tank (TA). This tank is filled up with an insulating medium (INS) of high dielectric strength, for example, an insulating oil or insulating gas, with the result that the insulation distances between the sealed tank (TA) and the valves (U), (V) and (W) can be shortened.
The sealed tank (TA) is provided with an opening (BR
REFERENCES:
"Development of HVDC Thyristor Valve Insulated & Cooled by Compressed SF.sub.6 Gas", S. Matsumura et al., IEEE 1983, 83 WM 170-8.
"Gas Insulated HVDC Converter Stations", F. E. Fischer et al., World Electrotechnical Congress, USSR, Jun. 21-25, 1977.
Jones Judson H.
Mitsubishi Denki & Kabushiki Kaisha
Salce Patrick R.
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