SU1200367A1 - Controlled a.c.voltage-to-a.c.volatage converter - Google Patents

Abstract

ADJUSTABLE VOLTAGE VOLTAGE VARIABLE CONVERTER, containing powerpans, which are the main part of the system, and the primary windings are connected to taps and connected through two parallel circuits from the windings of the current-limiting droplets, disconnecting contacts of the contactors and the surface of the templates, and by means of the snapshots, and by means of the templates, and by means of the templates, and by means of the templates, and by means of the templates, and by means of the templates, and by means of the templates, and by means of the templates, and by means of the templates, and by the means of the outputs, the templates and the moving touch panels of the contact systems and the moving contacts of the application and by the output of the templates and the moving templates of the touch systems and the moving contacts of the application and by means of the outputs of the templates and of the templates will be connected. , characterized in that, in order to increase reliability by forcing the voltage, the current-limiting reactor is made of three The third winding is connected between the common point of the other windings and the first power output of the inserted key with two-way conductivity, the second power output of which is connected to the output winding of the power transformer corresponding to the minimum number of turns, in addition to the secondary winding of the power transformer included the primary winding of the injected current transformer, parallel to the output terminals, the primary winding is entered (L of the voltage transformer, in The normal winding of the current transformer is connected through the input of the force inhibit unit to one of the inputs of the input force trigger unit, the outputs of which are connected — one directly, the other through the input time relay with the first and second inputs of the input key control unit, to the third input ) the input of the force trigger unit is connected to the secondary windings of the voltage transformer.

Description

one

The invention relates to electrical engineering related to the conversion of electrical energy, and can be used in transformer construction, as well as in industrial enterprises and electrical power stations having transformers to increase the reliability of operation of electric power consumers.

The purpose of the invention is to increase reliability by forcing a voltage.

The drawing shows a diagram of the proposed device.

A power transformer 2 is connected to a source of alternating voltage, the primary winding 3 of which has taps. A load 5 is connected to the secondary winding 4 of the power transformer 2. One of the terminals of the alternating voltage source 1 is connected to the taps of the primary winding 3 via a current limiting choke 6, having three windings 7-9. The windings 8 and 9 are connected antiparallelly through the opening contacts IO and 11 of the contactor and through the movable contacts of the switch I2 are connected to one of the primary winding 3 taps, the winding 7 of the current-limiting throttle 6 is connected to the other branch of the primary winding 3 via a thyratron 13; A smaller number of turns. The secondary voltage 4 is fed through a transformer.

14 voltage in the force start unit 15 and the key control unit 16. The current of the secondary winding 4 through the transformer 17 current enters the block 18 forcing prohibition, the output of which is connected to the input of the unit 15 to start the force. One output of the force start unit 15 is connected to a time relay 19, the output of which is connected to the key control unit 16. Other block output

15 the start of the force is connected to the second input of the control unit 16. The output of the control unit 16 is connected to the outputs of the control key 13.

The device works as follows.

When the voltage on the secondary winding 4 of the transformer 2 drops below a predetermined setpoint level, as defined in 2003

divided by the force start unit 15, and provided that the current in the secondary winding 4 is less than the set current, the force start unit 15

5 through the control block 16 enables the activation of the key 13. The force inhibiting block 18 does not permit the launch of the forcing device in the short circuit mode in the secondary circuit

10 winding 4. A time relay 19 triggered from the force start unit 15 sets the duration of the voltage forcing over time. When the key is disabled 13,. Node,

A 15 consisting of two windings 8 and 9 of current-limiting choke 6, two break contacts 10 and 11 and a voltage switch 12, works in the same way as the known device. When the windings 8 and 9 are turned on and the contacts 10 and 1I are turned on, the voltage drop on the windings 8 and 9 is insignificant, which does not affect the load operation

25 5 with the correct choice of the tap of the winding 3. With the key 13 turned on, the load current flows through all the windings of the throttles 6. The current flow through the winding 7 causes a misalignment, popping the settings of the windings 8 and 9, as the winding 7, for example, with respect to the winding 8 is turned on opposite, and to the winding 9 agrees. In one case, the winding 7 reduces the magnetic flux of the winding 8 and increases the magnetic flux of the winding 9. In turn, the magnetic fluxes of the windings 8 and 9 act on the magnetic flux of the winding 7. As a result of the inductive coupling of the windings 7-9, the inductive resistance of the parallel-connected windings 8 and 9 and decreases the inductive resistance of the winding 7, which leads to a decrease in the circulating current in a closed loop consisting of the windings 7-9 of the contacts 10 and II, the switch .12, part of the turns of the primary winding 3 and the key 13 and an increase in voltage secondary

 the winding 4, since the source voltage 1 is applied to a smaller number of turns of the winding 3. After the time set by the time relay 19, the key is turned off

55 13. The circuit returns to its original position.

-VAk./- Ml

K 15

sixteen

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eight

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Claims (1)

ADJUSTABLE AC VOLTAGE CONVERTER TO VARIABLE, containing a power transformer, the primary winding of which is made with taps and connected through two parallel circuits from the windings of the current-limiting inductor, the NC contacts of the contactor and the movable contacts of the voltage switch with the input terminals, and the secondary winding with the output transformer characterized in that, in order to increase reliability by forcing voltage, the current-limiting reactor is made of three-winding moreover, its third winding is connected between the common point of the other two windings and the first power terminal of the inserted key with two-side conductivity, the second power terminal of which is connected to the terminal of the primary winding of the power transformer corresponding to the minimum number of turns, in addition, it is connected in series with the secondary winding of the power transformer the primary winding of the introduced current transformer, parallel to the output terminals is connected q the primary winding of the introduced voltage transformer, the secondary winding a current transformer is connected through an input blocking inhibit forcing to one of the inputs of the input block launch boost, the outputs of which are connected - one directly, the other through an input timer with the first and second inputs of the input control unit key, to the third input of which and to the second input of the block launch boost the secondary windings of the voltage transformer are connected. >