DE643607C - Machine set consisting of a number of generator units for generating high-voltage direct current - Google Patents

Description

For generating high voltage direct current generator units connected in series are used, which together form a machine set. Difficulties Such machine sets consist in the isolation of their step units from earth, as the voltage increases the unit following in the gradation with its body must be more isolated from the earth.

So far the procedure has been that you have the base plate and placed on it The drive motor of the machine set was connected to earth potential and the motor connected to the first Step unit, e.g. B. for the first 10,000 volts, joined together by a coupling of normal design. The second generator then achieves an insulation for 10,000 volts against the foundation, the third unit such for 20,000 volts and, if a set for 40,000 volts total voltage is in question, finally the fourth unit Isolation for 30,000 volts against earth. The isolating couplings arranged in between were rated for 10,000 volts each.

Fig. 1 shows that known arrangement. 2, 3, 4 and 5 designate the four generator units, which are jointly driven by the AC motor 1, the is placed on the grounded base plate 25. The associated excitation machines 6, 7, 8 and 9 are arranged on the back of the generators 2, 3, 4 and 5. The handles 14, 15, 16 and 17 of their field controllers 10, 11, 12 and 13 are sufficient for a shooter long-dimensioned insulating rods. The motor ι is at the first ι ο ooo volt stage 2 connected by a coupling 18 of normal type. The second stage unit 3 receives a sufficient for 10,000 volts insulation 22 of your housing against the base plate 25 and is for the same voltage through the isolating coupling 19 from the previous one Level 2 electrically isolated. The staggered rise of the isolators can also be seen 23 and 24 for the following level units 4 and 5 and the isolating couplings 20 and 21.

The example shown in Fig. 1 illustrates without further ado that the structure is mechanically unfavorable and asymmetrical and cannot meet practical needs. The "invention has therefore according to Fig. 2 shows an arrangement for a total voltage of 40,000 volts created, which mechanically far superior to the known according to Fig. 1 and a symmetrical structure is permitted. For this purpose, the foundation plate 30 is not placed on earth potential, but through the insulators 31 at least for half the total voltage, for example

*) The patent seeker stated as the inventor:

Dipl.-Ing. Harald Trachmann in Berlin-Ruhleben.

through the
/. 8 and 9

in the exemplary embodiment for 20,000 volts, isolated from earth. Now you can the generators 3 and 4 of the second and third stage immediately without intervening ^ '· lation on the base plate 30 and consequently also symmetrical to Ai £ Drive motor 1 are arranged. The hung 28 and 29 are of normal design. The generators 2 and 5 of the first and fourth stage stand on isolators 32 and 33, which together with the isolators the base plate are dimensioned for the total tension of the machine set. The units 2 and 5 are connected to the generators 3 and 4 by insulating coupling rings 26 and 27 corresponding to the voltages of the latter tied together.

Here, too, the generators '!' Built excitation machines 6 are excited, their magnetic regulators 10, 11, 12 and 13 with insulating rod drives 14, 15, 16 and 17 too. are actuated.

An AC or three-phase motor 1 is used to drive the machine set, which is not fed directly from the low and high voltage network, as in Fig. 1 is, but in a known manner with the interposition of an isolating transformer 34 is connected to the network with a transmission ratio of 1: 1. Primary- and secondary winding of transformer 34 are against each other for the same voltage like the foundation plate against earth, i.e. in the embodiment for 20,000 volts, isolated. If a three-phase asynchronous motor is used, the star-delta switch is used 35 arranged on the primary side of the transformer 34, so that starting in the usual Way can be done.

For safety reasons, the entire unit is fitted with an earthed protective grille surrounded, on whose supports the handwheels for operating the field controller can also be attached.

It is sometimes undesirable to select either the positive or the negative pole of the To lay the high-voltage line to earth.

While in the known machines set the ER only by switching the excitation • _t was reichbar that fiction, Hgemäße-arrangement allows the polarity reversal by one ■ laches switching the power line laying the ground connection.

Claims (4)

Patent claims: i. Machine set consisting of a number of generator units for generation high voltage direct current, characterized in that the foundation plate (30) of the unit (1, 2, 3, 4, 5) for part of its total voltage is isolated from earth and the generators (3, 4) the second and third stage carries without intermediate insulation while the generators (2, 5) of the first and fourth stage on the foundation plate by insulating beams (32, 33) supported and insulated with the shaft of the unit are coupled. 2. Machine set according to claim 1, characterized in that the foundation plate (30) is separated from earth by an insulation (31) which corresponds to half the total spacing of the unit, and that the units (2, 3 or 4, 5) ⁷ ^ are arranged symmetrically at both ends of the drive motor (3) on the foundation plate. 3. Machine set according to claims 1 and 2, characterized in that it is driven by an AC or three-phase motor (1), which via an isolating transformer (34) is fed, its primary and secondary winding by at least the potential difference of the foundation plate (30) of the machine set are separated from each other by sufficient isolation from earth. 4. Machine set according to claim 3, characterized in that when using an asynchronous motor (1) the star-delta switch (35) for the starting process on the primary side of the insulating transformer (34) is nngcordered. 1 sheet of drawings