SU1169032A1 - Variable-ratio transformer - Google Patents

Abstract

The ADJUSTABLE TRANSFORMER containing a coreless magnetic core, three windings located on the central core of the magnetic core, the two windings being fixed, coaxial and located one above the other in height, and the third winding concentric to the fixed windings and installed with the possibility of mixing along them, distinguish and. so that, in order to expand the functionality of the transformer and ensure its operation, additionally as an afterburning transformer, as well as a welding transformer, the adjustable transformer is equipped with a switch containing fixed contacts located on the boards and moving contacts, each of which closes with fixed contacts the corresponding board, the first two contacts are for connecting the input voltage, the third movable contact is for connecting the second terminal of the output voltage; the first output of the movable winding is connected to the fourth movable contact, and to the fixed terminals it is connected. The first terminal of the first winding, the first terminal of the moving winding, the first terminal of the second board, the second terminal of the first winding, the first terminal of the second winding, the second terminal, the fourth terminal, to the contacts of the third board the second output of the moving winding, the second output of the second winding, and to the third and fourth contacts the second output of the first winding, to the first and second contacts of the fourth state, respectively, the second conclusions of the second and base zhnoy windings, a first terminal of the first coil is also intended for coupling the first terminal of the output voltage.

Description

The invention relates to electrical engineering and can be used in installations for igniting insulation damage to UHXCH cable lines as well; in testing laboratories x. The aim of the invention is to expand the functionality of the adjustable transformer and to ensure its operation as an afterburning transformer, as well as a welding transformer, and thereby reduce the weight and size of the entire burning installation. On. FIG. 1 shows the proposed adjustable transformer; in fig. 2 - the same, top view; in fig. 3 - switch; in fig. 4 — sets of moving contacts and insulation boards with fixed contacts; in fig. 5 is a connection diagram for operating voltage regulator mode B; in fig. 6 is a wiring diagram for operation in an afterburning transformer mode; in fig. 7 is a connection diagram for operation in a welding machine mode. Fixed windings. 1 and 2 and the movable winding 3 of an adjustable transformer are located on the armored core magnetic circuit 4. The windings 1 and 2 are coaxial and are located one above the other in the height of the rod. The winding is concentric to the fixed windings and can be moved along them by means of the mechanism 5. The leads of all the windings of the adjustable transformer are connected to the switch 6. The switch determines the connection circuit of the windings with each other, with the supply network and with the object depending on the operating mode of the transformer. The switch consists of a handle 7, a housing 8, fixed contacts 9 fixed on the insulation boards 10, and movable contacts 11 that are fixed on the shaft 12. The rotation of the shaft is controlled by the handle 7, while the moving contact moves and closes a corresponding fixed contact and a connection circuit is obtained. In the connection diagrams (Figs. 5-7), pins 1, 1, 2, 2, 3 are marked, C - winding 1, 2 and 3, respectively, supplying the network .13, 14 (primary voltage), outputs 15 and 16 (secondary voltage). All three windings of conventional regulators of UT type voltage control have the same number of turns. In a pre-regulated adjustable transformer to ensure the functions of a voltage regulator, an after-fire transformer KfaTOpa and a welding machine, the number of turns of the moving and fixed windings must satisfy a certain ratio. The primary voltage of welding machines is 220 or 380 V. Moreover, U is 220 V. The secondary voltage of welding machines 1 at idling is Uc-g 65 V. The ratio between the number of turns of the moving and fixed windings in this case should be A :. . Uc6WH where Wp is the number of turns of the moving winding; the number of turns of the fixed winding. This ratio is required in order to get the required voltage from the proposed adjustable transformer: to perform welding of 65 V, for burning and after-burning insulation of cables 1000 V. Thus, the parameters of the magnetic circuit are first determined using the well-known method of calculating conventional UT-type controllers and the number of turns of the fixed windings. Then, the number of turns of the moving winding is determined from the above ratio. Adjustable transformer operates as follows. In the voltage regulator mode, the switch in its initial state (Figs. 3 and 4) provides the wiring diagram shown in Figs. five; the fixed windings are connected in series and counter to the input voltage; the movable winding is shorted, the adjustable voltage is removed from the first fixed winding. The output voltage is adjustable from zero to the value of the input voltage. Voltage regulation is carried out by changing the position of the moving winding relative to the stationary ones. Unlike the known voltage regulators, the number of turns of the moving winding of the proposed controller is significantly different from the number of turns of the fixed windings. However, this does not interfere with the operation of the controller, since in this mode the movable winding is short-circuited. The afterburner mode is obtained by turning the switch knob clockwise. In this position, the switch provides the wiring diagram shown in FIG. 6; all regulator windings are connected in series according to the input voltage supplied to the first stationary winding. ku, the output voltage is removed from all windings. At the same time, the output of the regulator is 2 X / N VJn with a voltage. For this regulator, the output current is 2W - 2 1200 V. Such a voltage is necessary to burn off the insulation of damaged high voltage cable lines and burn the insulation of low cable lines. tension Welding mode is obtained by turning the switch knob counterclockwise. In this position, the switch provides the wiring diagram shown in FIG. 7: the input voltage is applied to the moving winding, the output voltage is removed from the fixed winding, i.e. The object to be welded is connected to the fixed winding 1. All other characteristics of the proposed transformer also correspond to the characteristics of the welding machine: the transformer develops sufficient power (10-15 kVA), has a steeply dipping characteristic and provides smooth current control over a wide range. The welding current is controlled by moving the moving winding. Thus, the proposed adjustable transformer performs the functions of three devices: a voltage regulator, an afterburning transformer, and a welding anhapaTa. The application of the proposed adjustable transformer allows refusing two devices (afterburning transformer and welding machine), the functions of which it successfully performs. This provides significant cost savings, and also significantly reduces the weight and dimensions of the test-. burning installations.

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Claims (1)

ADJUSTABLE TRANSFORMER containing an armored rod magnetic core, three windings located on the central core of the magnetic core, two windings being stationary, coaxial and located one above the other along the height of the rod, and the third winding is concentric with the stationary windings and installed with the possibility of moving along them, I distinguish it by a wide one. The fact is that, in order to expand the functionality of the transformer and ensure its operation additionally as a afterburning transformer, as well as a welding transformer, the adjustable transformer is equipped with a switch containing fixed contacts located on the boards and movable contacts, each of which is closed with fixed contacts corresponding board, the first two contacts are for connecting the input voltage, the third movable contact is for connecting the second output voltage terminals, the first output of the movable winding is connected to the fourth movable contact, and the first output of the first winding is connected to the two first contacts of the first board to the stationary contacts, the first output of the movable winding to the third contact, the second output of the first winding to the first contact of the second board, to two other contacts. the first output of the second winding, to the fourth contact the second output of the movable winding, to the contacts of the third board the second output of the movable winding, the second output of the second winding, and to the third and fourth contacts the second output of the first winding, to the first and second contacts of the fourth state, respectively, the second conclusions of the second and movable windings, the first output of the first winding is also intended to connect the first output voltage terminal. Tis