SU760277A1 - Device for control of switch at melting glaze ice - Google Patents

Description

The invention relates to energy and can be used to control the switch when melting ice in the intermittent mode (CRP).

At present, a circuit consisting of a control key and electromagnets for switching on and off switches is used to control the switch when melting ice in the CRP. The start time of the melting circuit, pause and number of cycles are set manually by the operator through the control key.

With this control scheme, errors in the time of on and off operations limit the minimum duration of cycles and, accordingly, the maximum possible current densities and minimum line lengths that can be melted at standard voltages.

The closest in technical essence to the proposed switch control circuit is a circuit that is a “pulse-pair”, the windings of two relays of which are connected to the power supply terminals, and the contacts are included in the circuit of the windings of the solenoid on and off2

switch. However, this control scheme is characterized by low efficiency of ice melting, since it does not allow to adjust the duration of cycles, which is necessary when changing meteorological conditions or when using a scheme for melting on a line group. In addition, the operator must turn off the control circuit after a specified number of cycles.

The aim of the invention is the extension of its functionality. This goal is achieved by the fact that the known control circuit of the switch is equipped with an intermediate relay connected to the power supply terminals, connected in parallel to the winding of the first relay “pulse ¹⁵ pair”, a time relay and a pulse counter, the winding of which is connected in parallel with the turn-on electromagnet, and its contacts are included in the circuit windings of the intermediate relay, and the “pulse-pair” is 20 completed on two time relays.

Diagram of the control device shorting switch when melting ice in the intermittent mode is shown in the drawing.

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The control device consists of a toggle switch 1, a start button 2, an intermediate relay 3, its contacts 4, 5, an intermediate relay with a delay of release 6 and its contacts 7, 8, 9, pulse counter 10 (pin 11). In addition, the control unit includes a time relay with a delay of ^ί operation 12 (pin 13) and 14 (pin 15) and a time delay relay with return 16 (pin 17). Time switches 14 and 16 form a “pulse-pair”. Electromagnets on 18, off 19, and ₁₀ block contacts of the switch 20 and 21 shown in the drawing, but not part of the control circuit; they are in the drive of the switch. Using the toggle switch '1, the control circuit is connected to a voltage source, and button 2 starts the circuit. Relay 12 sets the duration of the off state of the switch, and relay 14 - on. Relay 16 sets the duration of the first start. Intermediate ^m Noe relay 3 connects the chain to the voltage switching control electromagnet and the relay 6 delivers the pulse to the circuit breaker and provides a single operation time relay 16 defining length and telnost first switching cycle.

When the device is connected to a voltage source, the toggle switch 1 is turned on. Start

the device is made by pressing button 2. This connects the relay 6, pins 7,

8, 9 of which will open after releasing the ¹⁰ time delay buttons.

During this time, connects the relay 3, which applies power to the solenoid switch on and lock itself block contacts 4. After inclusion _and Nia switch closes its contact block 20 and the connected time relay 14 and 16. When the relay 6 is switched off dropout contacts 8 relay 16. Contacts 15 relay 14 in the tripping electromagnet circuit 19 is closed earlier than pin 17 of relay 16, so 40

four

as the time delay on relay 16 is longer. After the closure of contacts 15 and 17 in the opening circuit, a pulse will be given to open the circuit breaker. When the switch is disconnected, its block contacts 20 open and the contacts 21 in the relay circuit 12, which sets the pause duration, close. After actuation of the relay 12 will be given a pulse to re-actuation of the switch. The number of cycles will be counted using a pulse counter 10 connected in parallel with the turn-on electromagnet 18. When the number of pulses reaches a predetermined value, contacts 11 in the relay circuit 3 will break and the switch-on circuit will de-energize.

The use of the described circuit for controlling the switch when melting ice in the CRP will improve the melting efficiency by regulating the switch on and off times longer than the first cycle, which will allow the process of melting in the most optimal temperature regime for the minimum time and minimum loss.

Claims (1)

Claim A device for controlling a switch when melting ice, containing a “pulse-pair”, the windings of two relays of which are connected to the power supply terminals, and the contacts are included in the circuit of the windings of the on and off switches of the switch, characterized by the fact that it is equipped with connected to the power supply terminals of an intermediate relay connected in parallel with the winding of the first “pulse pair” relay, time relay and pulse counter, the winding of which is connected in parallel with the electromagnet winding the switch is turned on, and its contacts are included in the winding circuit of the intermediate relay, the “pulspar” is made on two time relays. 760277