SU750636A1 - Automatic device for protecting and connecting welding transformer - Google Patents

Description

(54) AUTOMATIC FOR PROTECTION AND CONNECTION OF THE WELDING TRANSFORMER

I

This invention relates to electric welding apparatus.

A known circuit breaker for protecting and connecting a welding transformer, comprising a switch with a protection made in the form of fuses, and a starter 1.

The closest to the proposed circuit breaker for protection and connection of the welding transformer contains a switch with a protection made in the form of fuses connected between the switch contacts and the starter winding connected to the welding transformer through its own contacts 2.

The known devices have insufficient reliability to ensure the electrical safety of the staff.

The purpose of the invention is to increase electrical safety.

This goal is achieved by the fact that the automatic machine for protection and connection of the welding transformer is equipped with a control transformer, the primary winding of which is connected to the network, and the secondary through the linear opening and the first closing contacts of the actuator are parallel to the primary and through the second closing

contacts - parallel to the winding of the actuator, which through the opening contacts of the actuator is connected to the terminals of the secondary winding of the welding transformer, the outputs of the primary winding of which are connected to the network through the linear opening contacts of the actuator.

The drawing shows s.hema machine.

The device contains a switch 1 with protection in the form of fuses 2, a control transformer 3, the primary winding 10 of which is connected to the switch 1, the winding of the actuator 4 through the disconnecting contacts 5 and 6 of the actuator is connected to the secondary winding of the welding transformer 7.

Between the power contacts 8 and 9 by means of the closing contacts 10 and 11 of the actuator, the secondary winding of the transformer 3 is turned on, which in turn is connected in parallel to the winding of the actuator 4 through the closing contacts 12 20 and 13 of the actuator. The primary and secondary windings of the actuator are connected via disconnecting line contacts 14 and 15 of the actuator.

Claims (2)

The device works as follows. When switch 1 is turned on, transformer 3 is turned on under voltage. The welding transformer 7 is turned on via the line contacts 14 and 15, and the coil 4 is fed through the contacts 5 and 6. The starter turns on and transfers the power of the winding of the starter 4 and transformer 7 through contacts 10-13 from transformer 3, and on the secondary winding of transformer 7, the voltage is not more than 12 V. When the electrode closes, voltage drops in the secondary winding 7, the starter turns off, the power of its winding is transferred by means of the closed contacts 5 and 6 from the transformer 7. When the welding circuit is broken, the voltage in the secondary winding of the welding transformer 7 increases and the contactors of the actuator turn on, the baking the power of the welding transformer from the control transformer. The use of the present invention comparatively simplifies the circuitry of the automaton, in this case the cost is reduced, the security is increased, which gives a sushi natural savings in the mass use of the device. An automaton for protecting and connecting a welding transformer containing you / / switch with protection made in the form of fuses connected between the switch contacts and the actuator winding connected to the welding transformer through its own contacts, characterized in that, in order to increase the electrical safety of the personnel, it is equipped with a control transformer whose primary winding is connected to the network and is secondary through the linear disconnecting contacts and the first closing contacts of the actuator are connected in parallel to the primary and through the second closing contacts in parallel to the winding The starter is connected to the secondary terminals of the welding transformer through the breaker contacts of the starter, the terminals of the primary winding of which are connected to the mains via the linear breaker contacts of the starter. Sources of information taken into account in the examination 1. USSR author's certificate number 102843, cl. H 03 K 17/24, 1951. 2. Device for reducing the no-load voltage of a welding transformer USCT-05U2. Technical Passport, 1965. and.