SU94980A1 - Automatic control of the duration of the supply of control voltage to the grids of mercury rectifiers - Google Patents

Description

In the known ion excitation circuits of electric generators, high-voltage and low-voltage capacitance contents, there are significant fluctuations in the duration of burning of the anodes of the converters, due to changes in the generator load. These oscillations make it difficult to choose the duration of the control voltage pulses applied to the grids of rectifiers.

If we choose the duration of the unwind, its pulse equal to the shortest anode burning time, and if the burning duration of the anode increases as the generator load increases, the grid will spray, causing contamination of the rectifier and, as a result, the probability of reverse ignition.

If one chooses the duration of the control pulse equal to the longest anode burning time, then when the anode burning time decreases at the last for the duration of the presence of positive grid voltage, the negative voltage is restored, which also increases the reverse ignition voltage. The proposed automatic controller eliminates the difficulty of choosing the duration of the control voltage pulse and increases the reliability of the rectifier operation.

The automatic adjustment of the duration of the control voltage pulses applied to the grids with the continuous burning of the anodes, determined by the load, is achieved in the proposed controller due to the fact that the high voltage rectifier of each phase is connected to the grid voltage opposite to the source of the voltage, which gives impulses constant a duration of 120 electrical degrees;

No. 94980

and giving pulses of variable duration, and in the grid circuit of each of the low-voltage rectifiers the anode current transformer of the high-voltage rectifier of that phase is similarly connected.

The drawing shows the complete rectifying circuit with the proposed automatic controller consisting of low-voltage rectifiers 1, high-voltage rectifiers 2, anodes 3, grids 4 and cathodes of rectifiers 5, anode current transformers 6, peak-generators of DC voltage pulses duration of 120 ° e. 7 and physical controllers 8.

Two impulses are fed to grid 4 of each rectifier: the first is 120 ° el. from generators 7; the second is from the anode current transformer 6 with a duration equal to the duration of the burning of the anode.

The difference between the grid pulse duration of 120 ° al. and a pulse from the anode current transformer of the low-voltage rectifier serves to control the previous high-voltage rectifier in this star.

The difference between the net pulse duration of 120 ° e. and the pulse from the anode current transformer of the high-voltage sup- ply flashes serves to control the low-voltage rectifier of the same phase.

Controller connections are shown only for one high voltage and one low voltage rectifier. The remaining compounds are made according to the circular permutation rule.

The subject is invented and

The automatic regulator of the duration of the supply of control voltage to the grids of mercury rectifiers in the ion-excitation circuit of an electric generator containing high-voltage and low-voltage rectifiers, on the grids of which electrical pulses are supplied from the source of the grid voltage, is distinguished by the purpose of improving the reliability of the rectifier operation is by automatically equalizing the duration of the control pulses applied to the grids: the duration of the anode burning, determined by the load , in the grid circuit of the high-voltage rectifier of each phase is connected to the source of the grid voltage, which gives pulses of constant duration equal to 120 ° el., the anode current transformer of the low-voltage rectifier, located in the next phase, giving pulses of variable duration, and the anode current transformer of the high-voltage rectifier of the same phase is similarly connected to the grid circuit of each of the low-voltage rectifiers.

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