DE527039C - Device for the rapid de-energization of generators - Google Patents

Description

Device for the rapid de-energization of generators The invention relates to Another embodiment of the de-excitation device according to patent t (.21 396, which is primarily intended for very large generators. With such is known for excitation of the generator: an excitation machine externally excited by an auxiliary excitation machine used. According to the invention, in order to achieve a strong de-excitation of the generator with, the opening of the short-circuiting the oscillation resistance in normal operation Switch the excitation winding of the auxiliary exciter machine parallel to the excitation winding of the generator to be de-energized. As a result, field energy flows when de-energizing of the generator via the auxiliary exciter machine, ne back into the exciter machine, whereby the polarity of these machines is reversed.

Some exemplary embodiments of the invention are shown in the drawing. In their figures, a is the generator and b is its excitation winding, which is fed by the excitation machine c. Their excitation winding d is fed by the auxiliary excitation machine e, which has a self-excitation winding f. The exciter windings d and f are assigned control resistors m and n. j is the short-circuit switch that bridges the oscillation resistance in normal operation. The oscillation resistance is determined by a preferably ohmic resistance k (Fig. I) or by a corresponding excitation winding h of an excitation machine (Fig. 2, 3) or by a resistor k and an excitation winding la connected in series with it (Fig. Q., 5 ) educated. The basic mode of action is always that described in the main patent. g is a permanently switched on series winding (compensation or compound winding), which further promotes polarity reversal. q, y, s are adjustment resistors that are used to adjust the windings.

The short-circuit switch j has several contacts, of which the contacts i, 2 are used to short-circuit the variable resistor in, while the contacts 3, 4, 7, $ connect the field winding f to the terminals of the auxiliary exciter e and the contacts 5, 6, 9, io can be used to connect the field winding f to the field winding b in parallel.

In the arrangement according to Fig. I, on the one hand, the short circuit occurs when de-energizing of Vibration resistance h lifted and on the other hand the rheostat short-circuited in and the field winding f connected in parallel to the field winding b. The de-excitation process is therefore carried out by the field winding f and the series winding g supports.

In the arrangement according to Fig. Z, the oscillation resistance is an excitation winding la of the auxiliary exciter e used when de-energizing the current of the exciter c is flowed through and bridged in normal operation by the short-circuit switch j is. When de-energizing, the series winding h now support each other, the compensation or compound winding g and the shunt winding f of the auxiliary exciter e. These windings are used to achieve aperiodic de-excitation, the main generator adjusted accordingly, for which purpose, as shown in Fig. z, substitute or adjustment resistors s, q are provided in the individual circuits. The excitation winding h can be smaller be measured if the short-circuit switch j. in the sense of Fig. q. :respectively. 5 still a resistor k bridged.

The excitation winding h can also be arranged on the excitation machine c. This then has a separate excitation winding d as shown in Fig. 3 and also a series winding h bridged by the short-circuit switch j , which is short-circuited in normal operation and whose short-circuit is canceled when de-energizing. When the short-circuit switch j is opened: the series winding h of the exciter c is switched into the circuit in such a way that the polarity of the machine is quickly reversed. As already described in the main patent, this polarity reversal is supported by the excitation winding d of the excitation machine, since current flows through it in the opposite direction when the switch j is opened. The rheostat m is short-circuited in the sense of Fig.

The series winding is dimensioned for short-term activation, and in such a way that an aperiodic decay of the generator excitation current is achieved, To which the mentioned equivalent resistor and the adjustment resistor s can also contribute.

In Fig.q. another embodiment of the invention is shown, in: the by Gien short-circuit switch j both an ohmic resistance k and a series winding h of the exciter is bridged. With this arrangement The series winding h of the exciter c can be smaller than that according to Fig. 3 can be measured, as well as the resistance k, if the same effect is achieved shall be.

Fig. 5 shows another variant of this arrangement, where also a permanently switched on series winding g is provided on the exciter. The mode of operation of this arrangement is the same as the previous one, only the polarity is reversed through the compensation or compound winding; g still beneficiaries. This can of course also be part of the series winding h, however, the compensation or compound winding cannot be short-circuited, but switched on continuously is.

In order: to further promote the speed of the de-excitement, on Rotor of the generator to be de-excited or on the exciter machine: or. at this Exciting auxiliary exciter machine an additional one, only during the excitation effective external excitation must be provided, which is switched in such a way that it reverses the polarity supports.

The arrangements described above can be combined several times and also for various excitation systems, e.g. B. for those with several series-connected Exciter machines, use advantageously. Here it can be useful to have several Exciter machines each have a short-circuitable resistor through which the polarity reversal is initiated to assign. There can also be the different oscillation circles mutually influence z. B. in that the exciter by short circuit switch Get bridgeable excitation windings from the current of another excitation machine are flowed through.

Claims (1)

PATENT CLAIMS: r. Device for the rapid de-energization of generators according to patent 421 396 with one or more auxiliary excitation machines, characterized in that, at the same time as the short-circuit switch (j) is opened, the excitation winding (f) of the auxiliary excitation generator (e) parallel to the excitation winding (b) of the generator to be de-energized ( a) is switched so that when de-excitation the field energy of the generator flows back into the exciter machine (c) via the auxiliary exciter (e), thereby reversing the polarity of these machines. a. Device according to Claim z, characterized by an excitation winding short-circuited by the de-excitation switch, which supports the polarity reversal of the excitation system or the de-excitation process. 3. Device according to claim i, characterized in that the exciter is provided with a series excitation winding which is wholly or partially short-circuited in normal operation, the short circuit of which is canceled when de-energizing (Fig. 3). 4 .. Device according to claim i or 2, characterized in that the de-excitation switch (j) at the same time bridges a resistor (k) and the series winding (k) (Fig. Q., 5). 5. Device according to claim 1, 2 or 3, characterized by an effective only during the de-excitation or polarity reversal and this supporting external excitation on the generator or its exciter or an auxiliary exciter.aschine 6. Device according to claims i to 5, characterized in that the auxiliary excitation machine (e) which excites the excitation machine (c) has a shunt excitation winding (f) and an excitation winding (h) through which the main current of the excitation machine (c) flows and which is short-circuited in normal operation and whose short-circuit is canceled when de-energizing (Fig. 2). 7. Device according to claim i to 6, characterized in that the exciter or auxiliary exciter has a series compensation or compound winding (g) to facilitate polarity reversal. .