SU423224A1 - DEVICE FOR INCLUSION IN THE SPECIFIED PHASE - Google Patents

Description

one

The invention relates to devices for switching on at a predetermined phase in modeling installations.

The known device containing a short circuit simulation circuit connected to the phases of the simulation network through switching blocks controlled by a switch from the phase setting unit, the command block and the pulse generator through power amplifiers does not have sufficient accuracy.

In order to increase accuracy, the proposed device is additionally equipped with command switches connected between power amplifiers and a pulse generator, and their control inputs are connected to the switch through a turn-on delay unit and to the command block through a turn-off delay unit.

FIG. 1 shows a block diagram of the proposed device, where / is a command block, 2 is a voltage transformer, 5 is a task block, 4 is a switch, 5-7 are on-delay blocks, 8-10 are off-delay blocks, 11 is a pulse generator, 12–14 are command switches, 15–17 are power amplifiers, 18–20 are controllable gate switches, 21 is a short circuit simulation circuit. A, B, C, O are the phases of the simulation network.

FIG. Figure 2 shows the on-delay (off) circuit diagram, where 22 is the integrator, 23 is the diode T 24 is the threshold element.

FIG. 3 shows the circuit of the command switch, where 25, 26 are capacitors, 27-35 are resistors, 34, 35 are diodes, 36 is low-power thyristor, 37, 38 are transistors (semiconductor triode), 39-4} are inputs

command switch

The ability to cascade on and off short circuits in the phases of the simulation network is realized using blocks 5-W and 12-14. Moreover, blocks 5-10

designed to delay the leading edge of rectangular signals at their inputs.

The purpose of the command switches 12-14 consists of creating and blocking the communication of block 11 with the corresponding blocks 15-17

at the moments of time determined by the leading edges of the signals at the outputs of blocks 5 and S, 6 to 9, 7 10.

In the diagram in FIG. 2, the integrator 22 is connected to the threshold element 24 via a diode 23, which

eliminates the influence of block 24 on block 22 until the threshold element is triggered and provides greater accuracy in setting the delay time.

The delay time is calculated by the integrator 22, and the fixed time is fixed.

delay and the formation of a rectangular signal - block 24.

In the diagram in FIG. 3 in order to eliminate false inclusions of the thyristor 36 when the power is turned on, its control electrode is connected to the capacitor 25 and the resistor 27 via a diode 34, and the resistor 27 is in turn connected to the bus plus.

In this scheme, the transistor 38 is designed to pass a signal from the output of the pulse generator 11 to the input of the power amplifier 15 (16, 17). The thyristor 36 serves to switch the signal at the base of the transistor 38, and the transistor 37 to switch off the thyristor 36.

The chain consisting of capacitor 25 and resistor 27 serves to convert the leading edge of the signal at the output of the on-delay unit 5 (6, 7) into pulses that enable the thyristor 36. And the chain consisting of capacitor 26 and resistor 31 is for conversion) Vanishing the leading edge of the signal from the output of the delay unit 8 (9, 10) into pulses, briefly turning on the transistor 37.

When a switch-on signal (command) is sent to the input of block 4 from the block / output of block 4, a rectangular signal is formed, the leading edge of which coincides with the moment of voltage passing in phase A of the modulating network through the phase angle specified by the setting in block 5. This signal arrives integrators that are available at the input of the driver from the turn-on delay blocks 5, 6 and 7 and integrate. After a time determined by the integration time constant, the voltage at the integrator output reaches the threshold value of the threshold element 24, with the result that a rectangular signal with a steep leading edge is formed at its output. This signal is fed to the input 39 and unlocks the thyristor 36. At the same time, a negative signal is generated at the resistor 29, which removes the blocking of the signals from the output of the pulse generator 11 to the base of transistor 38.

When blocking is removed, the pulses from the output of the pulse generator 11 through the transistor 38 and through the corresponding power amplifier 15 (16, 17) are fed to the control input of the corresponding gate switch 18 (19, 20), which in the presence of voltage in the phases of the simulation network leads to switching on the corresponding valve switch 18 (19, 20) and connecting the phase L (B, C) with the short circuit simulation circuit dialed in block 21.

When a shut-off signal (command) is sent to the common input, the shutdown delay blocks 8, 9-10 each of them integrates the rectangular input signal and

through the time determined by the integration constant of the integrator 22 included at the input of block 8 (9, 10), the voltage at the integrator output reaches the threshold value of the threshold element 24, as a result

which, at the output of block 24, forms a rectangular signal with a steep leading edge. This signal, through a chain consisting of elements 26 and 31, briefly turns on the transistor 37, the cathode of the thyristor 36 is connected to the plus thickness, and it is turned off.

When the thyristor 36 is disconnected, a positive signal is generated at its anode, which, through diode 35, blocks the signal coming from the output of the block, // as a result of which it breaks

the connection between block 11 and the control input of the corresponding gate switch 18 (19, 20), and the corresponding phase A (B, C) of the simulation network is disconnected from the short circuit simulation circuit 21.

By setting different time constants for the integrators 22 in blocks 5–10, you can set different delay settings for the on and off of the switch switches — and then you can cascade the switch and

shutdown of short circuit in phases of a modeling network.

If the time constant of integrator 22 in the turn-on delay unit 5-7 is set to zero, then the switching time of the short

The closure in the corresponding phase of the simulation network is determined by the setpoint entered in the switch-on phase setting unit 3, i.e. the voltage specified at the connection point of the device.

Subject invention

A device for switching to a predetermined phase, containing a short circuit impregnation circuit, connected to the phases of the simulation network through switching blocks controlled by a switch from the phase reference unit, the command block and the pulse generator through power amplifiers, characterized in that equipped with command switches connected between the power amplifiers and the pulse generator, and their control inputs are connected to the switch via a switch-on delay unit and to commands th unit through a delay unit shutdown.

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