SU1403293A1 - High-voltage thyristor unit - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in thyristor npeo6pa30BaTeviHx. The purpose of the invention is to improve the weight and size parameters. In the device, each of the series-connected thyristors I is bridged by a protective cell, including two parallel-voltage circuits connected in parallel to the thyristor I via a resistor 4. The first chain consists of a series-connected diode 5, the first winding of drossel 2 and a capacitor 3. The second chain consists from the back of the diode 6, connected in series with the capacitor 7. The second winding of the throttle 2 is located on the same magnetic core with its first winding and is connected in parallel to the circuit from diode 5 and first The throttle windings 2. This design of the device allows, without the use of additional means and multiwinding chokes, to ensure, by choosing the capacitance values of capacitors 3 and 7, different time constants for damping forward and reverse voltage jumps. I il. (Oh (L

Description

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WITH

: The invention relates to electrical engineering and can be used in thyristor converters.

The purpose of the invention is to improve the mass abortions.

In the drawing, a schematic diagram of the sentence of the device is shown.

The high-voltage thyristor unit contains serially connected thyristor-tori I (only one of them is shown in the diagram), in parallel to each of which: a protective cell is included, which consists of: a first sequential circuit is included: from one winding of Drossel 2, capacitor 3 ,,: resistor 4 and diode 5, the second winding of thrusters 2, which is located on the first magnetic conductor and is connected in parallel: but from diode 5 and the first winding of the electrodes, I, and the second series of; 6 and capacitor 7, connected in parallel to the value of diode 5, choke 2 and I capacitor 3 of the first chain. I The device works as follows.

I In case of direct jumps on the thyristors of the block, their damping: is cleared by a chain of 3-4. Drosse .p 2 at the same time has no effect, so

as both its windings are included counter.

The capacitor 7 is disconnected by the diode 6. When thyristor 1 from iiiijianiiH 1, capacitor 3 is released through the second winding of the choke 2, so

as in the first winding, the diode 5 is turned on. Due to this, the rate of increase of the discharge current through thyristor 1 is small.

The surge of reverse voltage on thyristors is damped by a chain of 4-7. By selecting the capacitance capacitors 3 and 7, it is possible to provide different time constants for damping the forward and reverse voltage signals.

Claims (1)

Invention Formula A high-voltage thyristor unit containing sequentially connected thyristors, parallel to each of which Included is the first cell consisting of the first chain, the connecting and the donkey diode, the connected diode, the first drossel, the capacitor and the resistor, the second winding of the drossel located on the common magnetic conductor with its first winding , and the second chain of the reverse voltage of the series-connected other diode and capacitor, characterized in that, in order to improve the weight and size parameters, the second winding of the choke is specified included on the parallel part of the first chain, including the diode and the first winding of the throttles, the second chain is connected in parallel to the part of the first tsetchka, including the diode, the first winding of the throttles and a capacitor.