SU1684852A1 - Device for monitoring voltage - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control voltage in electrical circuits, for example, in control current circuits. The aim of the invention is to increase the completeness of control by fixing a short-term voltage disappearance. When the monitored voltage disappears for a short time, all elements of the device return to their original state. When the monitored voltage subsequently recovers, the value of which is close to the nominal, the minimum voltage relay 4 returns and the intermediate voltage relays 8 and 9 operate, the last of which through its closing contact 18 becomes self-sustaining. The activation of the intermediate relay 9 also leads to the closure of its contacts 21 and 24, as a result of which the signal lamp 30 lights up and the sound alarm element 31 is triggered. 1 Il. from C O 00 Ј. 00 SL yu

Description

The invention relates to electrical engineering and can be used to control voltage in electrical circuits, for example, in control current circuits.

The aim of the invention is to increase the completeness of control by fixing a short-term voltage disappearance.

The drawing is a schematic diagram of the device.

The device contains a measuring converter 1 of monitored voltage, the outputs of which are connected to the first 2 and second 3 busbars, minimum 4 and maximum 5 voltage relays, the winding pins of which are connected to buses and 2, the first 6. the second 7, the third 8 and the fourth 9 intermediate relays, one winding terminals of which are connected to the tavern 2, an executive unit 10 connected by one input to the tavern 2, a disconnecting contact 11 of the minimum voltage relay 4 connected by one output to the tavern 3, and the other output to another winding terminal of interim relay 6, serially connected the first closing contact 12 of the intermediate relay 6 and the first closing contact 13 of the intermediate relay 9 connected in parallel to the contact 11, the closing contact 14 of the maximum voltage relay 5 connected by one output to the busbar 3, and the other output to the other output of the winding intermediate relay 7, the first closing contact 15 of which is connected in parallel with contact 14, the disconnecting contact 16 of intermediate relay 7, in parallel of which the series-connected control button with opening contact 17 and the first closing contact 18 of the intermediate relay 9, the second closing contacts 19-21 of the intermediate relay 6, 7 and 9, respectively, and connected in parallel third closing contacts 22-24 of the specified intermediate relay.

The measuring converter 1 of the monitored voltage can be made, for example, in the form of an isolation transformer 25 with a switch 26 in the secondary circuit.

Executive unit 10 can be performed, for example, in the form of a signal element 27 containing signal lamps 28-30 and element 31 of the alarm.

The device works as follows.

When a monitored voltage device is applied to the input, the value of which is close to nominal, and the closed switch 26 returns the minimum voltage relay 4 and the intermediate relays 8.9 operate, the last of which through the closing contact 18 becomes

self-retention When the intermediate relay 9 is activated, its contacts 21 and 24 also close, with the result that the warning lamp 30 lights up and the sound alarm element 31 is triggered. By pressing

the button 17 returns the intermediate relay 9, as a result of which the lamp 30 goes out and the sound alarm element 31 returns to its original state. The device is ready for action.

With an increase in the monitored voltage above the set value, the maximum voltage relay 5 is activated, its contact 14 closes, as a result of which the intermediate relay 7 is activated and

Its contacts 15, 20 and 23 are closed. Through contact 15, the relay 7 becomes self-holding, and the closure of contacts 20 and 23 causes the warning lamp 29 to light up and the sound alarm element 31 to be triggered.

When the value of the monitored voltage drops below the set value, the minimum voltage relay 4 is triggered;

contact 11, which leads to the operation of the intermediate relay 6 and the closure of its contacts 12, 19 and 22. Through the closed contact 12, the intermediate relay 6 becomes self-holding and the closure of the contacts 19

and 22 leads to the ignition of the warning lamp 28 and the operation of the element 31 of the alarm.

With the short disappearance of t-apr and its subsequent recovery, the device functions similarly to the specified case of supplying a controlled voltage to the input of the previously de-energized device.

Claims (1)

Invention Formula A device for monitoring voltage, containing a measuring transducer of a monitored voltage, to the outputs of which are connected the first and second busbars, the minimum relay voltage, the winding terminals of which are connected to the first and second busbars, the last of which is also connected to one output of the break contact of this relay, maximum voltage relay connected by one winding terminal to the first national bus bar, and one terminal of the closing contact of this relay to the second busbar, first intermediate relay connected by one winding terminal to the first busbar assembly; a control button with a break contact, one output of which is connected to the second busbar assembly; and an execution unit connected by the first input to the first busbar, characterized in that. that, in order to increase the completeness of control by fixing the short-term voltage disappearance, the second, third and fourth intermediate relays were additionally introduced, and the execution unit was made with five inputs, while another output of the opening contact of the minimum voltage relay was connected to another output winding of the first intermediate a relay that is also connected via a series-connected first closing contact of the first intermediate relay and the first opening contact of the fourth intermediate relay to the second sat An external busbar, another output of the winding of the maximum voltage relay is connected to the second busbar assembly, one output of the winding of the second intermediate relay is connected to the first busbar assembly, th the other end of the winding is connected to another output of the closing contact of the maximum voltage relay, in parallel with which the first closing contact is turned on 5 of the second intermediate relay, the winding leads of the third intermediate relay are connected to busbars, one winding lead of the fourth intermediate relay is connected to the first busbar, and the other winding lead is connected via the break contact of the third intermediate relay to the second busbar, another output of the control button is connected through the first make contact of the fourth intermediate relay to the other output of its winding, the second, third and fourth inputs of the executive unit are connected via the second closing contact The first, second, and fourth intermediate relays are respectively connected to the second busbar, and the fifth input of the executive unit is connected via parallel-connected third make contacts of the indicated intermediate relays to the second busbar.