SU44988A1 - Device for remote activation of electrical apparatus or devices - Google Patents

Description

The proposed device for remote activation of electrical devices or devices differs from known devices of this kind in that the electromagnetic relay used to close the circuit of the device or device when the relay is energized by a straightened current is equipped with cores or cores in a special way proportioned to short-circuited. windings; they are commensurate so that in the event of a short circuit in the relay winding circuit, the contacts of the latter return to inoperative condition and open the control circuit due to the excitation of demagnetizing electromotive forces induced in the short-circuited windings.

In FIG. 1 shows the electrical circuit of the device according to the invention for remote control of an individual drive; FIG. 2-principle construction of the relay used in the device, and FIG. 3-second control point scheme.

(241)

The electromagnetic contactor 1 is used to turn on the electric motor 7. The circuit of the contactor coil is closed by the contacts 10 of the electric relay 4 fed through the transformer 3 from the AC network. The protective relays 2 are controlled by a contact 9 in the coil circuit of the contactor 1 and thus protect the engine 7. The telecontrol of the contactor 1 is controlled via the relay 4 from the control point, where switch 6 is located (Fig. 1) or two push-buttons 12 and 13 (Fig. 3) and rectifiers 5, 11. Thus, relay 4 is powered by a rectified current.

Relay 4 consists (Fig. 2) of the Sh-shaped core 14, the main coil 15, the core 16, the regulating spring 18 and the short-circuited coil 17 or p yes coils.

The device operates as follows. When switch 6 is installed at the middle contact (starting position) in the circuit of winding i5 of relay 4, a rectified current flows sufficient to attract the core 16 and close the contacts 10. After that

contactor 1 is turned on. Then switch 6 is moved to the right-most kOHTai T- (to the operating position). Thereby, two rectifiers will be connected in series; current in relay 4 decreases; the resistance of the additional rectifier is so commensurate that in this case, relay 4 could hold its contacts 10 in the closed position, but could not turn them on if for some reason the voltage in the supply circuit disappears and then returns. Thereby, the zero protection of the controlled circuit will be implemented in the device.

The short-circuited windings 17 in the relay 4 improve the attractive effect of the core of the relay. However, the main task of short-circuited windings is protection against short circuits in the control circuit (for example, at point 8). The short-circuited windings 4 are designed so that in the event of a short circuit in the control circuit in the closed position, the core 16 returns to its zero position, shown in FIG. 2, and opens the contacts 10.

The additional rectifier 5 can be connected not in series with the main rectifier 11 (Fig. 1), but in parallel (Fig. 3); In this case, the internal resistance of the rectifier 11 is selected to limit the current in the control circuit to the value required to hold the relay 4 corona in the closed position, but not sufficient to attract the corrode from the off position shown in FIG. 2. When the rectifier 5 is turned on, the current in the circuit of relay 4 increases to the time it is started up in the control circuit to a value sufficient to attract the cortex of the relay 4 from the off position

Thus, button 12 with normally closed contacts serves to turn off the controlled installation, and

To the OP13 with normally open contacts - to enable the installation. We offer: this device can be used for control and signaling purposes in various installations.

The subject matter of the invention.

Claims (3)

1. A device for remote switching on electric aririapSfuB or devices, characterized in that the relay 4, which serves to close the contacts 10 in the circuit of the device or device when the relay is energized with a rectified current, is provided with short-circuited windings located on the core or on the crust, so proportioned that in the event of a short circuit in the winding circuit of the relay (for example, at point 8), the contacts of the latter returned to inoperable state due to the excitation of demagnetizing currents in the short-circuited windings, AC short circuit current. 2. When using the device according to claim 1, use an additional rectifier connected in series with the main rectifier to the relay 4 winding circuit and having such a resistance so that when both rectifiers are turned on, relay 4 can only keep its contacts 10 in the closed position, but not could include them, in order to implement in the device a zero protection of the controlled circuit. 3. When using the device according to claim 1, applying an additional rectifier that is turned on when the relay 4 is turned on in parallel with the main rectifier, the resistance of which is so commensurate that when powering the relay 4 winding through the main rectifier of the relay 4, it can only keep the contacts in the closed position do not include them, in order to realize zero protection of the controlled circuit. cpi / srl, LP, .lll | 1t - 4s- | -i4 -o-LLLLLg (J  AI tzjziMrQ // - X ™ 1 o- I ABOUT