DE1638906A1 - Circuit arrangement for continuous voltage regulation on transformers, in particular traction vehicle transformers - Google Patents

Description

VEB Lokomotivbau-Elektrotechnische PA 300

Works by "Hans Beimler"

1422 Hennigsdorf 1638906

Neuendorfstrasse

Circuit arrangement for continuous voltage regulation on transformers, in particular traction vehicle transformers

The invention relates to an improvement in the circuit arrangement for continuous voltage regulation on transformers, in particular on traction vehicle transformers according to patent application V 31 498 VIII b / 21 d ² .

According to the main application, the controllable rectifiers connected anti-parallel in the two busbars are one Selector switchgear of a transformer that can be regulated on the high-voltage side depending on the switching status of the selector switch mechanism through self-ignition control, pulse control and blocking voltage control controlled.

During the control process, when switching from a transformer tap on the other hand, a group of controllable rectifiers connected in anti-parallel, a B thyristors, controlled by pulses that can be shifted in relation to the phase position of the mains voltage *

If the electronic pulse control device fails during the control process, will the group of thyristors at the lower voltage be further controlled by blocking voltage control? controlled until the selector gearbox dia self-sweetness & Θ2? higher, tension lying group voa S

η β β $ β / ei e? 4 bath

special operating conditions when the high-voltage transformer is inductively loaded and the self-ignition control is switched on at the moment in which the group τοη thyristors lying on the lower voltage is traversed by the load current, but the voltage is already in its sighting vice versa, step voltage short-circuits can occur

The invention is based on the object of providing the circuit arrangement for continuous voltage regulation on transformers, in particular traction vehicle transformers, with controllable rectifiers connected in anti-parallel in the two Collective bars of a selector switchgear, in which there is an arrangement for ignition control of the controllable rectifier from a self-sin control, a control by reverse voltage of the attached group of anti-parallel switched controllable rectifier and a control by displaceable pulses is provided, the self-ignition control only when a group of controllable rectifiers and the control by reverse voltage and operation only Pulses applied together during the switching process be designed with simple means so that step voltage short circuits even under special operating conditions to be safely avoided

According to the invention, the object is achieved in that the switches of the circuit arrangement according to atestaammeldung Y 31 498 VIII b / 21 d ² the WShX @ rschaltwerk so sugeoxintv sia & _s that dl · switch, file the SelbstiüM * t # meru3Sf & m? Group"

, first

BATH ORIGINAL

f ν η Q u τ κ / na t

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- the switches that switch on the blocking voltage control of the groups are closed and that the group of controllable rectifiers connected to the higher voltage can only be " controlled" after the blocking voltage has been controlled by the self-ignition control

This further increases security Furthermore, in the event of a defect in the pulse control device, e.g. Continuation of the drive of the traction vehicle is guaranteed without interruption and an overload or destruction of Components safely avoided by step voltage short term

The invention is illustrated below using an exemplary embodiment described »In Cusr associated drawing shows

Jffg * 1 is a schematic representation of FIG Circuit arrangement

Controllable rectifiers 3 connected in anti-parallel; 4, e.g. thyristors, are connected to a busbar 1 of a meter holding works (not shown) with a transformer tap a high voltage transformer β connected, also the Thyristors 5; 6 via busbar 2. Both groups the anti-parallel connected thyristors are provided with the well-known self-ignition control, consisting of a conduct « the connection between the anode and ignition electrode of the thyristors, via one »two anti-parallel connected thyristors common switch 7 and 8, resistor 16 and istte diodes 15, in both connections in front of the ignition electrode

009835/0674 ^{BAD 0RI6 |} NM.

and the resistor 16 are arranged so that only a current flow in -direction of the cathode takes place · Each group of antiparallel switched thyristors is also equipped with transformers 11 and 12, their two secondary windings each with an ignition gap of the thyristors over in the direction of the Ignition current switched diodes 17 »17 * and resistors 19; 19 * are permanently connected in series, being parallel to each ignition path Zener diodes lie, and their primary sides through switches 9 and 10 to the output of a pulse control device or can be switched over to the controllable rectifiers of another group connected in anti-parallel.

If the switch 7 is closed, the anti-parallel connected thyristors 3 >> 4-, the load current, are controlled the self-ignition control · at the thyristors 5ϊ 6 is the Step voltage on. If the switch 10 is closed so that the step voltage with blocked thyristors 5 »6 at the Transformer 11 is applied, the flows to. Ignition of the thyristors 31 4 · necessary half-wave through the diodes 17 and is through a zener diode 18 in connection with a resistor 19 in converted into a trapezoidal pulse.

If the switch 7 is opened, the group of thyristors 31 4- via a step or reverse voltage of the group of Thyristors 5 »6 controlled. If the transformer 12 via the Switch 9 connected to the pulse control device 13, the reversal process begins by pulse control of the group of Thyristors 51 6. After the load current has been taken over through the pulse-controlled group of thyristors 5ί. 6 will the transformer 12 via the switch 9 to the reverse voltage the group of thyristors 3; 4 placed so that the load current

009835/0574

leading group of thyristors 5 »6 by means of reverse voltage control the switched-off group of thyristors 3 »4-ignited is. Then the switch 8 is closed according to the arrangement of the switches of the selector switchgear and the self-ignition control uses.

When switching from busbar 2 to busbar 1, the control process proceeds in reverse order.

0 0 9 8 3 ^r ■ i 0. ^r 7 /,

Claims (1)

, Claim: Circuit arrangement for continuous voltage regulation on transformers, in particular traction vehicle transformers, with controllable ones connected in anti-parallel Rectifiers in the two rolls of a selector switch mechanism, in the case of the ignition control of the controllable Rectifier an arrangement consisting of a self «ignition» control, a control by reverse voltage of the Anschnitt ge controlled group of controllable rectifiers connected in anti-parallel and a control system by means of displaceable pulses is provided, with the self-ignition control only when a group of controllable rectifiers is operated alone and the control by reverse voltage and impulses together during the maintenance process are used, according to patent application V 31 498 VIII b / 21 d, characterized in that the switch 7? 8 | 9; are assigned to the selector switchgear in such a way that Sohalter 8, or in the sequence Sohalter 7, only closes after So holder 9 or 10 the transformer 12 or 11 to the Reverse voltage has placed the group of controllable rectifiers lying on the lower voltage and that the at the higher voltage group of controllable equals « riohttr can only be controlled after the shutdown voltage control via the transformer 12 or 11 duroh the self-ignition control iet. 009835/0574