SU1695436A1 - Circuit breaker control gear for deicing overhead power transmission lines - Google Patents

Abstract

The invention relates to power engineering and can be used to control a switch when melting ice on power lines in an intermittent manner. The purpose of the invention is to increase reliability by automating switch control. When you press the start button 26

Description

(L

WITH

o you ate

J

with

ON

a turn-on electromagnet 16 is activated and contact 23 of relay 15 closes. When the temperature of the wire in an ice-free area reaches the first threshold value, a signal is triggered at the third output of temperature sensor 1, triggering the delay unit 17. Either after the delay time has elapsed, or when the temperature has reached the second threshold value, relay 6 is activated, which by its contact 18 through the auxiliary contact 24 switches off the electromagnet T off and the contact 19 disconnects the memory 10 from the output of the divider 9 When the temperature

The invention relates to power engineering and can be used to control a switch when melting ice on an overhead power line in an intermittent melting mode.

The aim of the invention is to increase the reliability of switch control by automating the control.

The drawing shows a block diagram of a device for controlling a switch when melting ice on overhead power lines.

The device contains the first 1 and second 2 temperature sensors, the first comparison unit 3, the shutdown unit 4 consisting of the element OR 5, the shutdown unit relay 6, the shutdown electromagnet 7 coil, the pause control block 8 consisting of the divider 9, memory block 10 ti, the second comparator unit 11, the enable unit 12, consisting of the first 13 and second 14 switching relays, the two-winding relay 5, the on-off switch solenoid coil 16, the delay block 17 closing 18 and disconnecting 19 contacts of the shutdown relay, closing contact 20 of the first including rel , NO 21 and NC contacts 22, comprising a second switch, normally open contact 23 two winding relay 24 closing and normally closed auxiliary contacts 25 of the switch, the start button 26, the first 27 and second 28 supply bus.

The device for controlling the switch when melting ice on overhead transmission lines works as follows.

When the start button 26 is pressed, the power buses 27 and 28 are energized on the switch-on unit 12: the coil 16 of the turn-on electromagnet of the switch and the first winding of the two-winding relay 15 is turned on. a comparison unit 11 including a relay 13; A contact 20 of a relay 13 again supplies power to the electromagnet 16 on. Melting continues until the temperature of the wire in the ice-free area is not comparable with the temperature of the wire in the area with maximum ice deposits. At the same time, at the output of the comparator unit 3, a signal appears that switches on the relay 14, the contact 21 of which brings the relay 15 to the initial state, and the contact 22 breaks the power supply circuit of the relay 13. 1 sludge.

smelting process When the switch is turned on, the disconnecting block contact 25 of the switch opens and the closing block contact 24 closes, preparing the power supply circuit

coil electromagnet 7 off switch. At the same time, relay 15 is activated and closes its closing contact 23. Temperature control during the melting process is performed by temperature sensors.

The first temperature sensor 1 has three analog outputs, the second and third threshold, and at the second output the response threshold is higher than the third. The signal at the third output appears when the temperature of the wire exceeds the temperature allowed for the wire in continuous melting mode, at the second when the temperature exceeds the temperature allowed for intermittent, melting mode.

When the temperature of the wire during melting reaches a lower threshold value, at the third output of the first temperature sensor, a signal is received that is fed to the input of the delay unit 17,

If the time to reach the second threshold value is longer than the time of the delay unit, then at its output a signal is received that goes to the input of the shutdown unit 4, i.e. to the second input element

OR 5. If the time to reach the second threshold value is less than the time of the delay unit, the signal to the shutdown unit 4, but now to the first input of the OR 5 element, will come directly from

the second output of the sensor 1 temperature.

When a signal arrives at any input of the element OR 5, a signal appears at its output and the relay 6 of the shutdown unit operates. Its normally open contact 18 energizes the coil 7 of the electromagnet off of the switch. The switch is turned off, the working period is over.

During the working period, when the switch was turned on, from the first output of the first sensor 1, the current temperature value was applied to the divider 9 of the pause control unit 8 and from the output of the divider to the memory unit 10.

The opening contact 19 of the relay of the disconnecting unit opens the input of the memory unit 10, on which information is stored corresponding to the opening time of the contacts 19. This value is fed to the second input of the second comparison unit 11, the first input of which receives the current temperature value of the wire from the first input of sensor 1 temperature

When the temperature of the wire drops to the value specified by the divider and stored by the memory unit, the signal levels at the inputs of the second comparator unit become the same and a signal appears at its output that goes to the first switching-on relay 13 of the switch-on unit 12. The relay is activated and its closing contact 20 supplies power to the coil 16 of the electromagnet turn on. The switch is turned on, the next working period begins.

This will occur until the maximum signal from the output of the second temperature sensor 2 is comparable to the maximum signal from the first output of the first temperature sensor 1. At the same time, at the output of the first comparison element 3, the VITS signal and the second closing relay 14 will operate, which, by its opening contact 22, opens the power supply circuit of the first switching relay 13. not allowing the switch to turn on. With its closing contact 21, the second switching relay 14 supplies power to the second winding of the double-winding relay 15, ensuring the return of the entire circuit to the initial state.

Claims (1)

Invention Formula A device for controlling a switch when melting ice on overhead transmission lines, containing the first and second temperature sensors to be installed on the wire of the transmission line in sections with the smallest and largest ice deposits, the first comparison unit, the first input of which is connected to the output the second temperature sensor; the second input — with the first output of the first temperature sensor — designed to display the current temperature value; with the OR element, the first input of which is connected to the second output of the first temperature sensor, designed to signal that the permissible temperature of the wire in intermittent melting mode, the second input of the shutdown unit through the delay unit connected to the third output of the first temperature sensor, designed to signal that the permissible temperature of the wire has reached in the continuous melting mode, the pause control unit whose input is connected to the second input of the first comparison unit , and a switch-on unit, associated with a pause control unit, characterized in that, in order to increase reliability by automating the control of the switch, it additionally introduces The first and second power buses are added to the disconnecting unit; additional disconnecting unit relays are connected to the output of the OR element, and a switch-disconnecting electromagnet coil connected in series, the closing contact of the switch and the closing contact of the disconnecting relay connected to the power buses, and the output of the switch the disconnecting device is the disconnecting contact of the relay of the disconnecting unit, the pause control unit is in the form of a divider, a memory unit and a second comparison unit, while the output of the divider is connected to the input of the memory unit Through said disconnecting relay contact of the shutdown unit, the output of the memory unit is connected to the first input of the second comparator unit, the input of the pause control unit is the divider input and the input of the second comparator unit connected to the first output of the first temperature sensor, and the output of the pause control unit is the input of the second comparator unit, which is connected to the closing contact of the newly introduced two-winding relay, the switch-on unit is made up of the first and second relays, the specified two-winding relay and the electromagnet coil a switch on circuit; in this case, the first winding of a two-winding relay is connected to the first power bus through a newly introduced start button by one output and to the second power bus through a disconnecting block contact of the switch and the first closing coil of the second switch a relay to the first power bus, the second winding of a two-winding relay is connected by one output to the second power supply bus and the second output to the first power supply bus via the second contact the first relay, the second including relay is connected to the output of the first comparison unit, and the first including relay is connected via the opening contact of the second including relay 7.16954368 the closing contact of the double-winding cut-off and switching on the first and second relays, and the second terminals of the relay coils of the relay block are connected to the zero bus.