SU942236A1 - Device for excitation of synchronous generator - Google Patents

Description

one

The invention relates to electrical engineering, in particular, to devices for driving synchronous generators.

A device for driving a synchronous generator, made according to a power phase computation scheme with a thyristor connected in parallel to the rectifier input, is known, the thyristor control circuit being made on an active inductor divider connected, Q in parallel to the thyristor. The device provides power to the excitation winding of the synchronous generator in all operating situations including short circuits per lithium. Auxiliary, 5-telled regulation (correction) of the induction current is carried out by the thyristor, which operates in the short-circuit mode, Mykatel, shungir part of the period. eg #, the wives of the converter input. In a relay, the value of the average per-second voltage at the output of the rectifier changes with, which provides control of the excitation current t lCono. O: this mode of operation of the thyristor. Prt results in a short circuit current with operating current thyristor that complicates shutdown of the damaged area.

The closest to the present invention is a device for exciting a synchronous generator, made according to the power circuit diagram of phase matching with a block of paired switches. A separate rectifier containing parappie branches, in each of which the thyristor, the np & i guard and the magnetic divider are connected in series, besides the control circuit of one thyristor (fief miero) is made under the aelectric linkage of the divider connected to the {I) link block, and the scheme uprpvlenn other thyristor (Vedogch) | Vipo; seam on the magnetic divider, Taksh way, the problem of disabling the thyristor; Resheva by dividing his chain into; ParaTsel-. Pre-arm tel. During the breakdown of the thyristor, an emergency current flows through the damaged circuit, which RO is at least yi times the operating current of the thyristor (where y is the number of parallel branches of the thyristor block). In order not to complicate the control circuit of the thyristor unit, the slave thyristor is controlled on a magnetic divider 2) The disadvantage of such a device is that when the leading thyristor is broken through, the emergency current flowing through the divider forcibly turns on the driven thyristor, as a result of which the emergency current is distributed between thyristors, while the current in the damaged circuit decreases by a factor of six, which complicates and slows down the shutdown of the damaged branch. A punctured ti {dastor shunts the input of the rectifier, the excitation current begins to decrease, r c, the voltage of the stator of the synchronic generator decreases, therefore the supply voltage of the device for excitation of the synchronous generator decreases, the emergency current decreases. Disabling the damaged branch in this case is even more difficult. If the situation is unfavorable, the fuse of the damaged circuit does not turn off for several periods, which leads to a loss of excitation and the emergency disconnection of the synchronous generator from the mains. UeJtt's invention is an increase in the reliability of the device. The goal is achieved by the fact that in a device for driving a synchronous generator, made according to a power phase compounding circuit with thyristor blocks, connected in parallel to the rectifier and containing parallel branches, in each of which a thyristor, a fuse and a magnetic divider are sequentially switched on, the control circuit one thyristor is made on an active inductive divider connected in parallel with the thyristor unit, and the control circuit of the other thyristor is made on a magnetic divider, m a hedgehog (a magnetically controlled contact is included in the electrode with a electrode and a second thyristor located in a box with three windings, two of which are connected in series with the first and second thyristors, respectively, and opposite each other, and a third is short-circuited. On the fkg. Figure 1 shows the power supply circuitry of the device for driving a synchronous generator; Figure 4 shows a part of the short circuit current period. To the main conclusions of the synchronous gene; The rator 1 is connected to a lowering transfo (the mater 2, and the zero leads are the booster transformer 3. The secondary windings of these transformers are connected in series and connected to the rectifier 4. The output of the 4th terminal is connected to the excitation winding of the synchronous generator 1 It is connected to the thyristor block 5 and an active-inductive divider 6, controlled by the regulator 7. The thyristor block 5 contains parallel thyristors: the master 8, controlled from actinally D | TIVnogo healer 6 and the slave 9, controlled from 10 of the magnetic divider 11. Fuses 12 and windings 13 and 14 of coil 15 are connected in series with the thyristors 8 and 9. Coil 15 also has a short-circuited winding 16 and a magnetic contact 17 connected between the cathode and the control electrode of the thyristor 9. In the coil The thyristor control electrodes 8 and 9 include fuse contacts 18. The windings 13 and 14 of the coil 15 are interconnected. During normal operation, the circuits on the thyristors 8 and 9, and, consequently, the coils 13 and 14 of the coil flow almost equal, amounts The ary stream in coil 15 is zero and the gerksh does not communicate. Further, the operation of the device in normal operating conditions is carried out in the same way as in devices 1 and D. During the breakdown of the thyristor 8 through the thyristor 8, winding 13, fuse 12 and magnetic divider 11, the emergency current flows. A current of 10 magnetic divider 11 is induced by iDS, but the trigger 9 is not turned on, since a negative voltage is assigned to its anode. Therefore, the winding 14 does not flow around. Under the influence of the magnetic field of the winding 13, the magnetically controlled contact 17 closes and shunts the control and thyristor circuit 9. When the instantaneous emergency current decreases (during the current sine transition through O), the magnetically controlled contact 17 does not turn off, since this is prevented korogkoakamknoy winding 16. Time zapermsk release magnetic contact 17, determined by the speed

damping of the currents with a short-circuited winding 16, exceeds the time of the zone of Insensitivity of the TC of the magnetic control EMOT4) to the admission 17 (4ir, 2).

To MOKteHTy premium -fc. instantaneous shaking of the emergency current in the winding 13 11 causes the magnetically activated contact 17 to be activated, so it remains closed and polo9) Kichtelnaya half volts for example $ 1flash on the riser unit without giving the triple 9 its way, thus all the emergency current flows through the fuse 12 Psrezpennogo thyristor 8, contributing to it., the fastest disconnection.

After disconnecting the fuse 12 .Blocks-Contacts 18 of this fuse switch the active-inductive cutter 6 from the controlled electrode of the thyristor 8 to the controlling current;

The emergency process is complete. Magnetically controlled contact 17 opens. At a certain time of the conducting period, the thyristor 9 is turned on. On the thyristor circuit 9. Operating current flows. The magnetically controlled contact 17 is closed again, but since the thyristor 9 has already been turned on, switching the magnetically controlled contact 17 does not affect the operation of the thyristor 9. During the nonconductive period, the magnetically controlled contact softens. This removes the prohibition on turning on the thyristor 9 in the next conducting period.

As shown above, it is clear that the disconnection of the damaged thyristor is ensured in a time less than the almost appreciable change in the excitation current and. Incidentally, excitement loss due to TBJIIO breakdown is excluded

Torah. At the same time, all normal operation modes of operation are provided, both before the thyristor is damaged and after it is turned off.

Claims (2)

Formula invented by her and A device for initiating a synchronous generator, made according to the scheme of power phase compounding with a thyristor unit, connected in parallel to a rectifier and parallel to the parallel branches, in each of which a thyristor, a fuse and a magnetic divider, and a control panel of the first thyristor, are executed on - final; The cell is connected parallel to the tirks ob block, and the control circuit of the second thyristor is made on a magnetic divider, which, in order to increase the inflated operation, between the control electrode and the cathode, the second of these The magnetized contact is located, which is located in a dormantly inserted coil with three windings, two of which are included sequentially corresponding to the circuit of the first and second thyristors, in opposite direction, and the third winding of the specified Ka1ushka is short-circuited oh. Sources of information, which are given into consideration I USSR author's certificate t4i 396803, kp. H 02 R 9/36, 1971. 2. Technical description of Systems%; excitation of a static per1chgproyo | y vkova SPEMUO / 260. Registrar number ZBP, 999068.