SU65312A1 - Multiphase mechanical rectifier - Google Patents

Description

Mechanical: current rectifiers for operating voltages from 50 to 400-600 scholt during the early years of the first century to acquire a significant paradise Spread, because they have significant advantages at other voltages compared to other types of rectifiers, amenio: a) very high coefficients, polar effects (96-98%), b) low consumption (m of active materials and, accordingly, small dimensions, c) durability and impact in exploitation, d) insensitivity to mechanical shocks and temperature fluctuations.

The main disadvantage of the previous mechanical constructions of high-power devices - I1C1I in a switching device - P | iodo 1s with the help of a combination of “1D1Sator and spark suppressors with magnetic core made of steel) type“ permalloy.

Thanks to their high quality, the CTBaiM mechanics and other rectifiers should be widely used in industry and, first of all, in electrochemistry, in electrical equipment (tram, electric motor), in various mobile units.

The most deficient part of the entire device is spark-fighting chokes, for the manufacture of which a significant amount of special steel is consumed: with a high content of nickel or molybdenum, as well as red copper.

In the existing mechanic вып iche1 rectifiers operating in the MIHO-phase scheme with the derived zero point, the number of chokes is equal to the number of phases, and in the rectifiers working on the multi-phase bridge circuit (Gretz scheme), the number of chokes is usually twice as large as the number of phases.

By applying the switching circuit constituting the subject matter of the present invention, the number of xcrosis chokes is reduced to one to two for the entire rectifier.

For this purpose, the choke is connected between the main, connected through the capacitors to the source of the source tokz and carrying out the rectification, and the auxiliary, which is closed with advance, contacts that carry out the "closed circuit of the switches" during the working period and include it between phases during the switching period-.

In the case of 1 turn-on of the MOiCTOsofl rectifier circuit (Pretz c), the second throttle connected in the same way is used.

In the case of execution, you: the contactor contactor, the throttle end and the 1M end at: connect 1s to the transformer phases through the main contactors, and the other end through the help, providing alternate BC strangling the throttles into separate phases.

The foregoing describes the invention; shown in FIG. 1-4 which shows the various schemas mbf of the proposed | you submitter.

FIG. Figure 1 shows a three-phase high voltage circuit with a transformer zero point derived. The US-L02NO shows a drum-type straightener with sliding contacts. On the common drum, three solid (fnng) outlets /, 2, 3 and one split commuting ring 4 are mounted. The number of cuts on:. The commuting ring is equal to Зр, where p is the number of pole pairs of the synchronous cd-synchronous drive CD. On f | I1G. 1: is represented on the diagram; compatible with a drum making 3000 rpm (p 1).

On the mutating ring, the main and practical brushes are slid. The spark throttle 1C is included in the rastech between them. The throttle is D. Each of the outer rings are rigidly electrically connected to one W3 Selmento B of the switching ring.

The diagram shows T - transformer. Controller, C - capacitors.

At the time of kO | mmmutatsi i (ocenshire) the choke, as it appears from fig. 1, switched on, between the cammutated phases. The “C: formator” trap performs its function sparkling: and. When is the process? The commutation is complete, the throttle automatically locks | PI, as both brushes are on the same segment of the switching ring. Thus, a single spark-reducing choke consequently serves all three phases of the rectifier.

In the .MOSTO1 scheme, the number of spark arrester chokes must be equal to D1vom {FIG. 2).

In this scheme: two commutating (split) 4 n 5 rings, two sets of capacitors C | and Ca and two hitting drossel DI l D-2. The work of the scheme is analogous to us; : previous

In a manner that can be 1SHY1Completed by: a: ktornye transformers.

FIG. 3 so far: the contactor pattern is shown in one IC with one dussel circuit for the case of a three-phase circuit with a transformer zero point. Six contactors 6, 7, 8, a, b, c are controlled with a feed cam follower with a common camshaft.

Consider the operation of the circuit. We start from the moment when, contact 6 is closed, and all other contacts are closed.

The first phase of the transformer transmits to the rectified current circuit.

Not before the moment when it is necessary to: water | It is the second to work; the phase of the transformer, the contact a closes 1c, after which, with some delay, the contact 6 is opened and the choke D is connected in series to the current circuit. A choke is magnetized by a constant current, flowing in the same direction as the rectified current, given by the first phase, to the same degree as the point n.ma1n1: ich. The spur lies behind the knee, .m of the magneti curve (chen1.

Inductance | AND | SCRO1Ga1si) GO throttles in the region of our country all MQ is small and therefore it must be connected: without arcing, especially since the capacitor C is turned parallel to the throttle.

Then contact / is closed, due to which IB work enters the second phase of the transformer. The load from the first phase (cerexo: dit to the second phase. When the load passes from the first phase to the second (the second has finished, the second current in the first phase has reversed direction, the contact a opens and the first phase is turned off).

Subsequently, before the moment when the third phase of the transformer is to be put into operation, contact b is closed, after which contact 7 is opened. Throttle D turns out to be connected to the second phase of the transformer. Pin 8 closes, thanks to the bang load being transferred to the third phase of the transformer. Pin 6 opens and the second phase is turned off.

In a similar way, the process is repeated — when the load is transferred from the third (|) element to the first phase, and so on.

FIG. Figure 4 shows a similar circuit for rectifying a three-phase Gretz bridge circuit. The operation of the circuit of FIG. 4 is similar to the operation of the scheme fk-g. 3, and understood without further explanation.

Schels with a reduced number of chokes can also be easily constructed for other rectification situations, such as the six-phase circuit ic of the zero point derived, six, the Gracz phase, etc.

Subject and title

Claims (3)

1. Multipurpose mechanical; rectifier - with spark-suppressant throttle in the circuit of rectified current, about and with i and with I: the fact that for the purpose of servicing all phases with one choke, the latter is connected between the main, connected via capacitors with a phase-voltage current source and rectifying, and auxiliary, terminating with advance, contacts making short circuit of the throttles during the working period and switching it on between phases during the switching period. 2. In the middle of the mittel according to claim, in the case of its inclusion according to the bridge circuit (the Gretz circuit), the use of the included second second | 3. Rectifier change according to claim 1, from the list to the fact that, in case of making it contact, the choke is connected to the phases of the transformer via one main contact (main contactors, and the other end - through optional, providing, alternate vk. slyuchenie drossel in separate phases.