SU93260A2 - Device to control the position of the arrows - Google Patents

Description

BASIC Auth. St. L 83578 describes a device for controlling a contactless switch-actuator using a three-rod transformer with a variable transformation ratio, supplying a control relay and having a movable shaft. The latter directs the magnetic flux either to the secondary core or to the magnetic shunt.

The magnetic shunt is provided with an additional winding connected in the opposite direction of the secondary winding and reducing the voltage on the winding of the control relay.

In the described invention, a device for controlling the polarity of arrows, controlled by AC electric drives, inductive switches were used according to the author. St. AO 83578.

 A feature of the present invention is. that the alternating current taken from the control transformers to separate the power and control circuits is rectified by valve bridges connected in a differential circuit.

The electrical circuit of the device for the case of a single arrow is shown in FIG. 1 and for the twin arrow in FIG. 2

In the circuit, the following designations are given: CT - control transformers; B1 and B2 - valve bridges; KR - control relay.

The current obtained from the secondary windings of the control transformers is rectified with the help of valve bridges B1 and B2 installed in the drive.

The bridges are connected in a differential circuit, so that in the control circuit, i.e., in the winding of the control relay KR

type), a current is circulated, the sign and magnitude of which are determined by different types of emf taken from bridges B1 and B2.

In each of the extreme positions of the switch, one of the transformers (CT-2) is in the working state, creating an emf D-C., Which is significantly superior to the emf. the second transformer (CT-1), which is in a non-operating state.

Consequently, inequality will also be valid for forced voltages VI and V2, and the difference in voltages V2-VI will cause the corresponding direction of current in the winding of the control relay (solid arrow in Fig. 1).

In the other position of the switch, i.e., in the operating state of the CT-1 transformer, the voltage VI will be higher than the voltage V2 and the direction of the current will change (dotted arrow).

To pass a reverse current, each of the bridges is shunted by a resistor.

The use of a direct current control relay eliminates false triggering due to extraneous alternating current.

The circuit allows for the imposition of one of the wires of the control circuit on the working alternating current wire, since the voltage applied to it in the working wire due to the sequential connection of bridges B1 and B2 does not correct.

In the case of paired arrows, each of the near-arrow control transformers receives power from the secondary winding of the corresponding far-arrow control transformer (Fig. 2).

Obtaining the required in magnitude and sign of the control current is the result of the coordinated position of the control transformers near and far arrows.

Present Invention

D. A device for controlling the position of arrows, controlled by AC drives and having inductive switches according to the authors. St. No. 83578, characterized in that, in order to separate the power and control circuits, the alternating current removed from the control transformers is rectified by valve bridges connected in a differential circuit.

2. The form of the device according to claim 1, characterized in that the twin arrows use a two-stage signal current transformation, in which the near-arrow control transformers receive power from the corresponding far-arrow control transformers.

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