SU394767A1 - THREE PHASE AC VOLTAGE REGULATOR - Google Patents

Description

one

The invention can be used to control, in particular, to stabilize the alternating voltage of three-phase electrical consumers.

Three-phase reamer voltage regulators are known, containing as an executive body a three-phase voltage booster a-vtotisformator and six commuting meetings of o-lateral thyristor groups, which ensure the switching of the primary windings of the auto-transformer at 120 ° in the process of regulation. In this connection, the phase of the output voltages at lower and higher levels of regulation has a different meaning, and for a given range of regulation an increased overall power of the autotransformer is required.

In the proposed controller, the primary obiKTiKHs of each phase of the autotransformer are split into two identical sections and connected by a symmetric hexagon, to the vertices of which are connected commuting meeting-parallel thyristor groups. Every two opposite vertices of a hexagon are connected by a pair of anti-parallel thyristor groups with one of the Line terminals of the power supply.

Such an embodiment of the regulator provides for reversing the additional regulated voltage of the secondary windings of the autotransformer by 180 °. This causes a constant phase value of the output voltages of the regulator at lower and higher levels J of regulation and more complete use of the electromagnetic power of the autotransformer, which leads to a decrease in its size and weight with the specified limits of voltage regulation.

The drawing is a schematic diagram

0 adjustable controller.

The executive body of the regulator consists of a three-phase booster autotransformer / and six head-on-line 5 thyristor groups, formed from 4-5, 6-7. 8-9. 10-11 and

ristoramn i12-gz. The primary windings of the autotransformer are made of six identical sections 14-19, which are connected with a hexagon. The secondary windings 20-22 of the autotransformer are connected in series with the power supply. The line clips of the power source with phases A, B and C are connected to the primary windings of the automatic transformer by counter-parallel thyristic springs. The turning of the thyristors is sealed by the control unit 23, which is powered from the power supply via the contacts 24-26.

0 The regulator works as follows.

The supply of control pulses to the yupanel electrodes of thyristors 2-7 is synchronized with the moments of transition through zero values of the corresponding phase voltages of the power supply (for example, the control pulses on the electrodes 27 and 28 of thyristors 2 and 3 are synchronized with the last phase L) and precedes the time for supplying control signals to electrodes 33-38 of tyrn stores 8-13. Control pulses applied to thyristors that form a counter-parallel group, for example, thyristors 10 and 11 are shifted one by one more by 180 °. The control pulses supplied to the thyristors of the counter-parallel thyristor groups of different phases, for example the thyristors 10 and 12, are shifted relative to each other by 120 ° in the order of the phase voltages.

The control pulses supplied to the electrodes 33-38 have an adjustable position of the non-intermediate front within the semiconductor, corresponding to its phase para1 and nstpnnn. The three-phase voltage system is fed through the thyristor groups 2-3, 4-5 and 6--7 to the primary windings of the autotransformer and is reconstructed by them on the six-phase nanometer system (/ o - t / ic-f / is-blg- Un. The voltages f / 2o-22 of the secondary windings of the autotransformer are directed in this mode; it is opposite in relation to the phase voltage of the power supply with the A, B, and C elements, i.e., the full volt-voltage mode. The output voltages of the regulator in the Pune voltage mode are sinusoidal and coincide in phase with the 1 1 n power source. The control of their impulses Ilia electrodes 33 -,% n) and leads to the switching of thyristors 8-13 in the order of received pulses on one time closure of the conducting transistors of groups of 2-3, 4-5 and 6-7 voltage of switched sections nerve wrapping. Linear clamping of "1MY of the power source through the niVe lines of groups 8-.9, 10-11 n 12-13 are connected to opposite, compared to the considered case, vertices of the hexagon formed by sections of the nervous windings, in connection with which the flow phases in rods of the magpito-ipod, they are measured at 180 °. The voltages of the secondary windings of the autotransformer of the armature change their phase also by 180 °, adding arithmetically to the phase voltages of the source of Titania. The switching of thyristors 8–13 to PS1 wire; its state is carried out in momeptah crossing zero anode currents.

When wiring 8- /;) and, therefore, nonconductive, the transistor was 2–7 during each phase phase voltage of the power source, the mode of / volt add. In this mode, a series of alarms are provided for G / | 4- and 1C, - L / I6-Uir, - and If, - and both sections of the primary windings, as well as pa

I-b-f - j. secondary windings have an opposite phase but with no foam) with no.i: io; i only have been added. The output of the controller is also sinusoidal and in phase with the source voltages

pggani

Regulation of the output voltages of the regulator from the level corresponding to the full volt increment mode to the level corresponding to the POLO-NOY add-on mode,

This is accomplished by changing the position of the leading edges of the control pulses on the electrodes 33-38 from 180 ° to 0 °. The stress on the load at intermediate modes has a stepped-si-shape

form.

Subject invention

A three-phase regulator of a non-temporary paprin-containing, as the executive body of a three-phase power supply auto-breaker: an inverter and six commutating thyristor groups, formed by connected anti-thyristor H, characterized by the fact that, in order to reduce the size and weight of the autotransformer, as well as preserve the post-transformer; values of the phase of the output voltages at the lowest and the highest levels of regulation, the primary windings of each phase of the autotransformer are split into two identical sections and connections s sheetiugolpikom symmetrical to vershiiam which are connected with opposed narallelnye commutating thyristor group irichem two opposite hexagon verschiny soednnepy pair vstrechpo-parallel thyristor grupn th one of the power terminals lnneynyh istochpika.

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