SU1330697A1 - Arrangement for checking condition of thyristors of contact-thyristor high-voltage apparatus - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to expand the functionality of the thyristor diagnostics system of contact-thyristor switching devices by providing state monitoring with a closed contact system of an arcing element. In the case when the contact system of the arcing element 2 is closed, a voltage is applied to the primary winding of the step-up transformer 6. The transformer 6 pulls the voltage applied to the primary winding to a value equal to half the test voltage of the thyristor unit 3. The voltage from the secondary winding of the transformer 6 through the high-voltage flashes short-circuited by the contact system 7 is applied to the thyristor unit 3, which is two identical halves included antiparallel. If there are faulty thyristors 1, the latter shunts the indicators 4 and the corresponding diode 8 does not light up. 1 il. (L S / E SO O 05 | X GZ

Description

one

The invention relates to electrical engineering and can be used to control the state of a series-parallel-connected thyristors of a high-voltage valve operating in conjunction with a contact arcing element.

The aim of the invention is to expand the functionality of the thyristor diagnostics system of contact-thyristor switching devices by providing state monitoring with a closed contact system of an arcing element.

The drawing shows a diagram of the proposed device.

A device for monitoring the state of thyristors 1 of contact-thyristor high-voltage apparatuses, executed in the form of parallel-connected arcing element 2 and thyristor unit 3, contains indicators 4 connected through limiting resistors 5 parallel to each thyristor 1 of unit 3. The power source is designed as a standby transformer 6, one end of the secondary winding of which is connected to the middle point of block 3, and the other through high-voltage rectifying columns 7 respectively to the anode and cathode terminals of the block a 3. Indicators 4 can be made in the form of a LED 8, included in the diagonal of a direct current of a rectifying bridge 9.

The device works as follows.

In the case when the contact system of the arcing element 1 is closed, a voltage is applied to the primary winding of the step-up transformer 6. Transformer 6 increases the voltage applied to the primary winding to a value equal to half the test voltage of the thyristor unit 3. The voltage in the secondary winding of the transformer 6 through the high voltage rectifier columns 7 shorted by the contact system is applied to the thyristor unit 3, which is two identical halves included antiparallel. With good thyristors 1, the LEDs 8 of the indicators 4 are lit. In the presence of faulty thyristors 1 last shunt

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Indicators 4 are fired and the corresponding diode 8 does not light up.

With the contact system of the arcing element 2 open, state control is possible due to the fact that the high-voltage rectifying columns 7 at each positive voltage wave from the transformer 6 are connected antiparallel to half of the thyristor unit 3. When the arcing contact system 2 is open, the control can Whether 15 is supplied from the voltage from the transformer 6, or from the voltage on the contact gap, if present. In the latter case, the polarity of the voltage applied to the thyristor block can be any, since the LEDs 8 of the indicators 4 are powered through rectifying bridges 9. The resistors 5 in all cases serve to limit the current through

25 indicators 4.

Claims (1)

Thus, due to the power source in the form of a step-up transformer and the introduction of rectifying columns of transformer JQ ra, it is possible to check the state of the thyristors with a closed contact system of the arcing element, which expands the functionality of the device. Invention Formula A device for monitoring the state of the thyristors of a contact-thyristor high-voltage apparatus, made in the form of a suppressing element parallel connected to the arcing40 and a high-voltage valve containing a power source and indicators intended to be connected in parallel to each thyristor through restrictive 45 resistors, characterized in that, in order to extend the functionality, it is equipped with two high-voltage rectifying poles, and the power source is provided in the form of a step-up transformer, one end of the secondary winding of which is intended to be connected to the midpoint of the high-voltage valve, and the other is connected to one 55 nominal pins of high-voltage parallel pillars, the other terminals of which are designed to be connected respectively to the anode and cathode pins of the high-voltage valve.