SU1494108A1 - Reactive power source - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electrical networks and systems. The goal is to increase reliability. The switching on of the thyristor 6 occurs with an overmagnetized core due to the flow of current through the winding 7 and diode 4. The magnetizing forces of the windings 7 and 8 act counter to each other. The core is magnetized. The voltage at the inlet of the null organ 16 is formed by rectifying linear stresses. In the absence of a signal at the input of the null organ 16, a signal appears at the output of the circuit HE 21, allowing the signal from the power supply unit 12 to start triggering the trigger 10. The trigger 10 through the driver 9 starts the thyristor 6. 2 Il.

Description

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The invention relates to electrical engineering and can be used in electrical networks and systems.

The purpose of the invention is to increase reliability.

The goal is achieved due to the fact that the reactor is supplied with a second winding connected in series with the diode, opposite to the first winding of

Figo is a diagram of the device; FIG. 2 shows current and voltage diagrams

The circuit (fig „1) contains three capacitors 1, 2 and 3, which by some terminals are intended for connection to the network, and by others connected to the vertices of a triangular switch formed by diodes A, 5 and by a thyristor 20 ° In series with diode 4 and thyristor 6 includes windings 7 and 8 of the reactor. The control input of the thyristor 6 is connected to the output of the pulse generator 9, the input connected to trigger 10. The trigger input (s) of trigger 10 is connected to the output of the circuit. And 11o Power supply 12 via switch 13 is connected to the second input of circuit I 1 and the reset AOR (R ) trigger input 10 ,, Resistors 14 and 15 are connected to the same inputs - CONSTANTLY. They are necessary when used on microchips (fix a zero at the input). When using -c transistor logic elements, resistors 14 and 15 may be absent. The input of the zero-organ 16 is connected to the cathodes of the diodes 17 and 18, which are connected to the secondary transient windings of transformers 19 and 20 connected by primary windings to the input terminals of capacitors 1 and 2. The output of the zero-organ 16 is connected to the input of the HE circuit 21 connected 45 stroke to the input of the circuit I 11c

Fig 2 shows diagrams of a voltage network A, B, C,,, Ug, currents of network 1d, i g, ij, currents of diodes 4, 5 - i, ij and thyristor 6 - i. 50

In the up position of the switch 13, the thyristor 6 is turned on, and the capacitors 1, 2, 3 conduct current, In the position of switch 13 down, the thyristor 6 is turned off and the capacitors gg 1, 2, 3 do not conduct current.

As can be seen from Fig. 2, the thyristor 6 begins to conduct current after the current through the diode 4 ceases (time t .j). The switching on of the thyristor 6 takes place with an overmagnetized (at the t-t.) Core due to the flow of current through the winding 7 and the diode 4. The magnetizing forces of the windings 7 and B act oppositely. Therefore, when the conduction of the thyristor 6 enters into the stage, winding B has a greater inductance than it limits the rate of current increase in thyristor 6. In the section, a current flows through both windings 7 and 8, and therefore the state of the core does not change. At the time preceding t, the current i decreases, and the core with current i along the winding 7 is re-magnetized, preparing the core for operation (reloading) at time t, when the thyristor 6 begins to conduct again. This ensures constant magnetization of the core.

During the initial start-up of the device, it is unacceptable to turn it on at the site when diode 5 and thyristor 6 can simultaneously conduct current, which would cause a greater rate of current buildup through thyristor 6 due to the fact that windings 7 and 8 are connected in opposite directions

The voltages at the input of the zero-organ 16 are generated by the induction of linear voltages BA and SAC. Switching the switch 13 upwards at this moment will not cause the thyristor 6 to turn on. In the interval t – t, the signal to the thyristor 6 is admissible. 5 there is no voltage at the input of the zero-organ 16 and there is no output signal, therefore the output of the inverter HE 21 has a signal that allows the signal from the power supply unit 12 to start the 10o trigger.

When the key 13 is turned down, the trigger 10 is reset, removing the signal from the driver 9 The coil 7 will last after switching off, thus preparing the core for the subsequent (when switching the key 13 up) turning on the thyristor 6.

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Claims (1)

Claims of Invention A source of reactive power, comprising three phases1 1 of a capacitor battery, connected by one output to networks, two diodes and a thyristor connected in series with each other, and the second terminals of the two phases of the capacitor battery, different in that, are connected to the points of connection of the thyristor and one diode and this diode with another diode. Ca to: mzo 1x t-t t iit r in order to increase reliability, it contains a reactor with two windings, one of which of the same name are connected to each other and connected to the second output of the third phase of a capacitor battery, and the other ends are connected between the thyristor and another diode. t " . 2