RU96116577A - METHOD FOR SWITCHING BRANCHES OF TRANSFORMER WINDING AND DEVICE FOR ITS IMPLEMENTATION - Google Patents

Claims (2)

1. The method of switching branches of the transformer winding, in which the thyristor switches are disconnected and turned on at predetermined times, leading the voltage transition to the steps of the adjustment winding through a zero value, the switching being carried out ahead of the time θ, characterized in that they form a voltage in each half-period the reference voltage, for example, a sawtooth shape, compare it with the first voltage of the job and at the moment of equality of these voltages form the first synchronization pulses, The leading edge of which is formed by "shutdown" pulses of duration, for example, τ = 1-2 electric degrees, the generated reference voltage is compared with the second reference voltage and, at the moment of equality of the indicated voltages, second synchronization pulses are formed, the leading edge of which is formed by "turning" pulses duration τ; the value of the first reference voltage is chosen so that the “shutdown” pulses are in the time interval between the moment of transition through the zero value of the thyristor switch current coming out of operation and the moment ahead of the voltage transition at the steps of the adjustment winding through the zero value for a time θ = γ + ε , where γ is the switching interval of the thyristor switches during regulation to increase the voltage, ε is the time interval for turning off the thyristor, and the value of the second voltage of the reference is chosen so that the switching pulses are ahead of turn on voltage level of the regulating winding through zero at time θ; generate a “switching” signal and, when it coincides with the “shutdown” pulse, form a turn-off signal for the thyristor switch that goes out of operation, as well as an “enable” signal, when it matches the “switching” signal and the “turn-on” pulse, they form a turn-on signal, thyristor key coming into operation. 2. A device for switching branches of the transformer winding, containing the first three-input and two-input logic elements, the second inputs of which are connected to the control circuits "Below" and "Above," and the outputs are connected respectively to the first and second inputs of the first trigger, the non-inverting output of which is intended for connecting to the control input of the first block matching with the outputs connected to the control circuits of the thyristors of the first key, a voltage sensor with a first output, the input of which is connected to water supply source, characterized in that it introduced two task units, two similar pulse shapers, each with two inputs, the second three-input and two-input logic elements, the second trigger, command shapers with output control circuits "Above" and "Below", four similar synchronization units, each of which contains a voltage reference generator, for example, a sawtooth shape with two inputs, and a zero-organ, a second output is introduced into the voltage sensor, while, for example, the logic elements are made: three-input 2I-NOT, and two-input and both triggers of the RS-type trigger with the first R and second S inputs on the 2I-NOT elements, the first and second outputs of the voltage sensor are connected to the first inputs of the voltage reference generators, respectively, of the first, second and third, the fourth synchronization blocks, the second inputs of the reference voltage generators of these synchronization blocks are connected to the outputs of the first and second task blocks, respectively, in each synchronization block the output of the reference voltage generator is connected to the input of the zero-organ , the outputs of the zero-organs of the first, second, third, fourth synchronization units are connected to the first and second inputs of the first and second pulse shapers, respectively, the outputs of which are connected to the first inputs of both 3I-NOT elements and both 2I-NOT elements of the control circuit, respectively "and" Above "command shapers are connected to the second inputs of the elements of the fourth 2I-NOT and the third 3I-NOT, respectively, the outputs of the first and second elements of 3I-NOT are connected to the R-inputs of the first and second RS-triggers, respectively, and S inputs are indicated s RS-flip-flops connected to outputs of respectively the elements of the first NOR 2I 2I and second NOR outputs

the first and second RS-flip-flops are connected to the third inputs of the elements of the second 3I-NOT and the first 3I-NOT, respectively, and the Q output of the second RS-flip-flop is designed to connect to the control input of the second matching unit with the outputs connected to the control circuits of the second key thyristors.