Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1995-10-30
1997-10-28
Thompson, Gregory D.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
257718, 336 62, 336 92, 336 96, 336100, 336197, 361707, 361715, H05K 720
Patent
active
056822928
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a liquid-cooled valve reactor, in particular for a high-voltage DC transmission installation.
BACKGROUND OF THE INVENTION
For the purpose of distributing electrical energy, high-voltage DC transmission (HVDCT) systems are generally used today as the link element between two three-phase current systems. Line-commutated, controllable semiconductors convert the three-phase current at the transmitting end into direct current for transmission, and back again into three-phase current at the receiving end. The highest achievable thyristor voltage is small by comparison with the valve voltage required for economical transmission. It is therefore necessary to connect a multiplicity of thyristors in series for an HVDCT valve. In order to limit the rate of current rise in an HVDCT valve, a valve reactor having a liquid-cooled reactor coil and reactor core is additionally connected here in series to the individual thyristors in each case.
For the purpose of economical manufacture and of achieving only short down-times in the case of necessary repairs, each HVDCT valve includes, depending on the voltage which is to be controlled, a relatively large or relatively small number of identical thyristor modules and reactor modules which are combined structurally in the form of a tower in a tower-type basic frame.
A known valve reactor is disclosed in WO90/14674. In this valve reactor, the reactor core is surrounded on all sides by a noise-deadening insulating module casing which serves at the same time as a support frame and around which the winding is held on the support module casing of the reactor S outside.
The reactor core is assembled from two U-shaped subcores, in particular cut strip-wound cores. The insulating module casing is assembled correspondingly in accordance with the U-shaped subcores from two trouser-shaped insulating module subcasings which are situated opposite one another with their limb ends open and whose openings on the waist side can be sealed by a cover after the insertion of the U-shaped subcores.
EP 0 223 954 A1 discloses a further embodiment of a valve reactor, in particular for high-voltage DC transmission installations. In this embodiment, the reactor coil is encapsulated on all sides of the winding and the encapsulated block thereby produced is mounted via rubber buffers in a surrounding plastic clamping frame. The reactor core comprises two U-shaped subcores and, via tie-rods, is fastened unencapsulated likewise in the clamping frame. The winding is cooled by the use of hollow conductors. For cooling purposes, the reactor core bears cooling pockets placed on the outside at one end. For noise-deadening purposes, the entire arrangement constructed in this way is shielded by an outer deadening jacket, joining and connecting pieces of the liquid coolant feeder being situated, at least partly, inside the deadening jacket.
In the known valve reactors, cooling is achieved by means of heat dissipators which are placed on or wound in the system. As a result, the heat produced in the cores cannot be dissipated with high efficiency. Furthermore, the core halves are held together, as in the case of cut stripwound cores, by clamping bands which lack reliability in the case of large cores such as reactor cores. These clamping bands therefore often have to be reclamped.
SUMMARY OF THE INVENTION
The present invention overcomes the shortcomings of the prior art by providing a liquid-cooled valve reactor which no longer has the disadvantages set forth. According to the present invention, a liquid-cooled valve reactor, in particular for a high-voltage DC transmission installation, has two U-shaped reactor subcores and a reactor coil. Each of said subcores has an insulating casing and is braced by means of a clamping frame. The clamping frame has surfaces on which is mounted a heat dissipator. The reactor coil has a primary winding with two winding sections wound from a hollow conductor and a secondary winding. The reactor sub-cores are each provided with a
REFERENCES:
patent: 4009461 (1977-02-01), Usry
patent: 4663604 (1987-05-01), van Schaick
patent: 4775848 (1988-10-01), Sundermann et al.
patent: 5220484 (1993-06-01), Seri
Siemens Aktiengesellschaft
Thompson Gregory D.
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