SU1363359A1 - Arrangement for inhibiting repeated energization of installation - Google Patents

Abstract

The invention relates to electroautomatics, namely to the switching of an electrical circuit carried out by electromechanical switching elements. The device is intended for use in devices that cannot be switched on immediately after a normal shutdown. The purpose of the invention is to increase reliability. The blocking of switching on the switching apparatus of electrical installations in the specified period is ensured by a full-wave rectifying bridge, in the diagonal of which, by a constant current, a capacitor shunted by a resistance and a charge resistance is switched on. A two-half-period rectifying bridge is connected via a disconnecting contact of the Stop and KatyraKy buttons of the control relay connected to one power bus, and through the closing contact of the control relay to another operational power bus. The charging resistance is connected between the first power bus, to which the second input of the rectifying bridge is connected via the closing contact of the Start button. silt about 3 0 №

Description

The invention relates to electroautomatics, namely the switching of an electrical circuit carried out by electromechanical switching elements (relays, contactors, magnetic starters). Have

The device is intended for use in devices that cannot be switched on immediately after a normal shutdown.

The purpose of the invention is to increase reliability. .

The drawing shows a variant of the concept of the device for prohibiting the re-activation of the installation.

In the power circuit of the electromagnet 1 of the switching element is included the closing contact 2 of the relay 3 of the control unit. The power supply circuit of relay 3 consists of an operating current source 5, a push-button disconnecting switch 6, a full-wave rectifying bridge 7, shunted by resistance 8 to the closing switch 9. The closing contact 10 of relay 3 is a relay 3 pick-up contact. of the bridge 7 to the source 5 of the operating current in the on state of the relay 3, the closed contact 10 of the relay 3.

The device works as follows.

When the pushbutton switch is pressed, its closing contact 9 closes the operating current circuit from the source 5 to the winding of the relay 3 via a two- half-period bridge 7, the capacitor 12. The latter is then charged; relay 3 triggers and with its closing contacts 2 and 10 turns on the power of electromagnet 1, becomes self-picking through the break contact

button switch 6. Simultaneously-capacitor, one input of the emergency

the bridge through a series disconnecting contact of the button Stop and the control relay coil is connected to one power bus, and through the closing contact of the control relay to another operational power bus to which a second input of the rectifying bridge is connected to the Start button.

but the capacitor 12 is connected through the charge resistance P, the rectifying bridge 7, the contact W to the source 5 of the operating current. The capacitor 12 is then charged before the voltage of the source 5 of the operating current. When the device is disconnected by the opening contact of the button switch 6, the operating current circuit to the winding

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the relay 3 is broken and the relay is turned off, contact 10 is opened, through which the charged connection is maintained. current capacitor 12. Last-Starts to discharge through shunt resistance 8. Discharge time is determined by the constant burden of the resistance of the capacitor circuit.

Immediately after switching off, an attempt to turn on the device, button 9 will not trigger the relay, since capacitor 12 is not yet discharged and does not allow the switching-on current of relay 3. After a certain time has passed, capacitor 12 is discharged. When the button 9 is pressed, the charging current of the capacitor 12 passes through the winding of the relay 3, the relay 3 of the control unit 4 is activated and contact 2 turns on the electromagnet 1. By selecting the capacitor 12 and the resistance 8, you can set the required blocking time depending on the requirements of the switched circuit.

The most effective is the use of the proposed invention in devices equipped with a key-operated microcomputer in computer power supply sets and other devices.

Claims (1)

Formula invented and A device for prohibiting the re-activation of the installation, containing a rectifying bridge, in the diagonal of which a capacitor and a discharge resistance are included, as well as a control relay with a closing contact, charging resistance, start and stop buttons, power lines, and that, in order to increase reliability, the discharge resistance is connected in parallel to the end Editor N.Slobod nickname Compiled by G. Damsga Tehred M. Khodanich Proofreader A.Obruchar Order 6372/48 Circulation 618 Subscription VNIIPI USSR State Committee .on matters of inventions and discoveries 113035, Moscow, Zh-35, Raushsk a Embankment, 4/5 Production and printing company, Uzhgorod, st. Project, 4