Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1981-12-21
1984-04-03
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
357 76, 357 80, 357 84, H02M 706
Patent
active
044411502
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to high-voltage power supplies, and more particularly, to high-voltage rectifier units.
BACKGROUND OF THE INVENTION
A high-voltage rectifier unit is a device intended for conversion of a low-voltage alternating current into a high-voltage direct current. Devices designed for converting an alternating-current voltage into a direct-current one are well known and widely used in various fields of technology to supply electric and electronic devices, motors and the like. A transformer and a rectifier means are their basic elements. Depending upon the application and the parameters of high-voltage rectifier units they employ transformers of various power and type, while vacuum tubes and semiconductor devices with a unidirectional conduction are used as the rectifier means. Certain high-voltage rectifier units employ a plurality of rectifier means connected in series or in parallel and forming an integral construction element which is a rectifier device. The high-voltage rectifier unit operates as follows.
The alternating-current voltage to be converted into a direct-current voltage of a desired value is applied to the primary winding of the transformer whereas the secondary winding of the transformer supplies an alternating-current voltage to the rectifier means of rectifier devices which are interconnected and connected to the secondary winding of the transformer.
A load is connected in series with the output of the rectifier devices so that the current flowing through it is unidirectional as in the rectifier devices, i.e. is a direct current.
The value of the rectified voltage depends upon the transformer type and the voltage applied. The value of the rectified voltage can be adjusted by changing the voltage applied to the primary winding of the transformer. The unavoidable ripple of the rectified voltage can be reduced or eliminated by the use of special electric filters as well as by selecting an appropriate rectification circuit.
Most problems arise in construction of high and superhigh voltage rectifier units. In these cases, special measures are to be taken to provide the required dielectric strength of the rectifier unit by increasing the insulating gaps, the overall dimensions of the rectifier unit thus growing extraordinarily. This makes impossible to use them in an open construction for certain applications. It is especially difficult to construct high-voltage rectifier units for tens and hundreds of kilovolts. In this event the principal elements of the high-voltage rectifier unit--the transformer and the rectifier devices--are enclosed in a hermetically sealed vessel filled with an electrically insulating fluid, for example, transformer oil or insulating gas. In order to increase the dielectric strength of the gas it is usually used under pressure of several atmospheres. The high rectified voltage is derived from the rectifier unit through the vessel walls to a load located outside the vessel, using a high-voltage lead.
Known in the prior art is a high-voltage rectifier unit (cf. USSR Author's Certificate No. 546 128 dated 1976) that comprises a three-phase transformer, rectifier devices mounted on supporting insulators, a high-voltage electrode, and a high-voltage lead all enclosed in a vessel, filled with an electrically insulating fluid.
However, the construction features of the high-voltage rectifier unit mentioned hereinabove enlarge its overall dimensions and increase its weight since the axial dimension of the high-voltage rectifier unit is increased due to three insulating gaps used to provide the specific conditions of operation for this rectification circuit. The normal operation of the rectifier unit requires high-voltage insulation between circuit elements which have different potentials. In the high-voltage rectifier unit under consideration using the three-phase bridge circuit, the beginnings of the transformer secondary windings connected to the rectifier devices should be insulated from grounded parts of the transformer magneti
REFERENCES:
patent: 3718850 (1973-02-01), Juri et al.
patent: 4007402 (1977-02-01), Allport
patent: 4344126 (1982-08-01), Schumacher
"500 KV and 10 A Load Current Rectifier", by V. A. Gaponov, A. I. Grishchenko, S. S. Zhukovsky, V. S. Nikolaev, R. A. Salimov, and E. P. Semenov; Novosibrisk 1974; pp. 1-17 w/English translation.
Albertinsky Boris I.
Dmitrieva Nina M.
Evseev Anatoly K.
Fedotov Mikhail T.
Ivanov Andrei S.
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