SU483758A1 - Switching device for thyristor converter units - Google Patents

Description

one

The switching devices of the thyristor converter units are known, which contain a distributor connected to a key element of the corresponding converter and a voltage presence sensor in the network.

However, the known devices are inconvenient because it is impossible to switch from alternate operation of blocks to continuous. The need for this transition may arise, for example, when alternately working on the total load of converters powered from different networks, in the event of a voltage drop in one of the supply networks or when one of the converters is turned off. In this case, the remaining converter should provide power to the load.

The purpose of the invention is to provide uninterrupted power to the load during the transition from alternate operation of the converter blocks to continuous.

For this, in the proposed device between the distributor and the key element of each controlled unit, a logical OR circuit is included, one of the inputs of which is connected to its output through the AND circuit and the other input to a voltage presence sensor in the network.

The drawing shows a block diagram of the proposed device.

The device contains a distributor 1, a logic circuit "OR 2-4, a logic circuit matching" AND 5-7, a sensor 8 for mains presence and key elements 9-11 of the converter blocks.

The device works as follows. To the input of the distributor 1 receives a command to switch. Signal to each output

device or at least one of them comes from the distributor through the logic circuit "OR, to the second input of which is connected the output of the matching logic circuit" AND, the inputs of which are connected to the corresponding outputs of the device and to the input to which the command to prohibit the alternate operation is supplied, For example, from the sensor 8 voltage input network. The device operation diagrams are shown in FIG. 2

Commands for switching in the form of pulses are received at the input of the distributor. Switching signals are received from the distributor outputs. In the absence of a command from the sensor 8, signals from the distributor are received by

inputs 12-14 devices. If at the moment t a command is received to prohibit the alternate operation, then at each of the device outputs a continuous operation enable signal appears at the moment of nostuning from the distributor

next permissive signal.

Since at the time ti the command is sent from sensor 8 to the output 13 of the Nostunet device, the enabling signal remains, and at outputs 12 and 14, the enabling signals appear at times iz and ts, respectively, i.e. the signal from the distributor and is supplied to the key elements 9 and 11 of the converter blocks.

Subject invention

A switching device for thyristor converter units, containing a distributor, connected to a key element of a corresponding converter, and a sensor for the presence of a supply in a network, characterized in that, in order to ensure uninterrupted power supply of the load when switching from alternating operation of converter units to continuous, between the distributor and the key an element of each controlled block includes a logical OR circuit, one of the inputs of which is connected to its output through the AND circuit, and the other input to the sensor litchi network voltage.

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