RU2123750C1 - Gear controlling short-circuiting switch in circuits melting ice deposits - Google Patents

Abstract

FIELD: melting of ice deposits. SUBSTANCE: second intermediate relay with break and make contacts and time delay during operation which windings are connected to output of second rectifying bridge and third intermediate relay with make contact and time delay during reset which windings are connected via make contact of second intermediate relay are inserted into gear. These contacts are connected in series and to winding of cut-off electromagnet. EFFECT: expanded functional capabilities due to provision for operation in intermittent cycle. 1 dwg

Description

 The invention relates to the field of electric power and can be used to control a short-circuit breaker [SV] in ice melting circuits.

 A known control circuit of pollutants of the type "pulse-pause" [1], containing a time relay with a contact that closes with a time delay when removing voltage and a slip contact, and an intermediate relay with make contacts.

 However, this circuit does not include a trip circuit.

 Also known is the control circuit of pollutants with a spring drive [2], which contains a circuit for switching on pollutants of the "pulse-pause" type, and the disconnection of pollutants occurs due to the discharge energy of capacitors.

 However, this circuit is cumbersome due to the type of drive and cannot operate in intermittent mode [RCC], since after each cycle the pollutant will be disconnected.

 Other pollutant control circuits [3] are known, differing in the switching circuit, but having the same shutdown principle due to the energy of capacitors recharged during the melting process.

 The closest technical solution is the control module for air pollutants, used on cells K-102 and K-108, manufactured at the Moscow plant "Electroshield" and given in [4].

 It contains a first transformer, a time relay with a slip contact and a main (persistent) contact with a time delay contact, the first and second circuit breakers, a resistor, first and second diodes, a first capacitor, an intermediate relay with two make contacts, a contactor with two make contacts, first contact block, first diode bridge, switching electromagnet, second block contact, switching electromagnet, second diode bridge, second capacitor, current relay with open with time delay CTOM, second transformer, current transformer.

 However, this circuit in its present form cannot work in anti-ship missile systems, since during the next working cycle the pollutant is switched off. This leads to the fact that in the cells equipped with remote control, when melting in the RCC, they switch to manual control with the departure of personnel to the place of installation of air pollutants.

 The objective of the invention is to expand the functionality of the device for its operation in the RCC through the introduction of two intermediate relays.

 The task is achieved by the fact that in the control device ZV, located in the shorting point, containing a voltage transformer, a time relay with a slipping contact, the first and second circuit breakers, a resistor, two diodes, the first capacitor, the first intermediate relay with a make contact, a contactor with two make contacts, first block contact, first diode bridge, switch-on electromagnet, second block contact, switch-off electromagnet, second diode bridge, second capacitor, second transformer and a current transformer, where a time relay with a slipping contact is connected to the secondary winding of the voltage transformer through the first and second circuit breakers, as well as a branch consisting of a series-connected resistor, two diodes, a first capacitor, the output of which is connected to the first intermediate relay with a make contact, a contactor with two make contacts, connected in series with the first block contact, the first diode bridge, the output electromagnet of which is connected, and the next In relation to the secondary winding of the current transformer, the current winding of the second transformer is connected, the second capacitor and the second diode bridge are connected to the voltage winding, at the output of which there is a trip electromagnet and a second block contact connected to it in series, in contrast to the prototype, a second intermediate relay with a closing and NC contacts and a delay in response and a third intermediate relay with a NO contact and a delay in return. The windings of the second relay are connected to the output of the second diode bridge, and the third through the make contact of the second intermediate relay, the first contact of the second and the contact of the third intermediate relay are connected in series with each other and through the second block contact with the winding of the shutdown electromagnet.

 The second and third intermediate relays are used to control the melting current. The contact of the second intermediate relay that opens with a time delay serves to reliably operate the shutdown solenoid.

 The closing contact of the second intermediate relay serves to supply power to the third intermediate relay after the opening contact of the second relay opens. Due to such a power-up of the second relay and the winding of the third relay, the pollutant will not be disconnected in subsequent cycles during RCC melting. The closing contact of the third intermediate relay, opening with a time delay, is designed to disconnect the pollutant after the end of all melting cycles.

 The essence of the device is illustrated by the circuit (see the drawing, which shows the control device of pollutants in ice melting circuits, consisting of a voltage circuit and a current circuit).

 The voltage circuit contains a voltage transformer 1, the output of which is connected via a first and second circuit breakers 2 and 3 to a time relay 4 with a slip contact 5, a branch consisting of a series-connected resistor 6, two diodes 7 and 8, the first capacitor 9, the output of which connected to the first intermediate relay 10 with a make contact 11, a contactor 12 with two make contacts 13 and 14, connected in series with the first block contact 15, the first diode bridge 16, the output of which is connected an electromagnet I'm 17.

 The current circuit contains a current transformer 18, in series with which the current winding of the second transformer 19 is connected, to the voltage winding of which a second capacitor 20 and a second diode bridge 21 are connected, the output of which is connected to a second intermediate relay 22 with NC 23 and NO 24, the third intermediate a relay 25 with a closing contact 26, a shutdown electromagnet 27 connected in series with the second block contact 28.

 The voltage transformer 1 is designed to power the control circuit.

 The time relay 4 with a slip contact 5 serves to close with a delay time, detuned from the automatic restart (AR) circuit of the first intermediate relay 10 of the head switch.

 The first and second circuit breakers 2 and 3 are used to automatically protect the device.

 Resistor 6, two diodes 7 and 8 are designed to ensure the discharge of the first capacitor 9.

 The first capacitor 9 serves to actuate the first intermediate relay 10.

 The first intermediate relay 10 with make contact 11 serves to activate the contactor 12.

 The closing contacts 13 and 14 of the contactor 12 are used to close the circuit of the electromagnet enable 17.

 The first and second block contacts 15 and 28 show the status of the pollutant.

 The first diode bridge 16 is used to power the electromagnet enable 17 rectified current.

 The inclusion magnet 17 is used to turn on the pollutant.

 The opening contact 23 of the second intermediate relay 22 serves to close the circuit of the shutdown electromagnet 27 for 0.1 s. The closing contact 24 of the second intermediate relay 22 is designed to turn on the third intermediate relay 25.

 Shutdown solenoid 27 serves to shut off the pollutant.

 The closing contact 26 of the third intermediate relay 25 serves to close the circuit of the shutdown electromagnet 27 for 2 s.

 The second diode bridge 21 is used to power the winding of the electromagnet shutdown 27 DC.

 The second capacitor 20 is designed to smooth the voltage ripple of the second transformer 19.

 The second transformer 19 is used to convert current to voltage.

 The current transformer 18 is used to control the melting current and the coincidence of the current circuit.

 The device operates as follows. To turn on the pollutant, a voltage pause is created by turning off the head switch. Time relay 4 loses power and with a time delay detuned from the automatic reclosure, closes the slipping contact 5, discharging the first capacitor 9 to the first intermediate relay 10. The first intermediate relay 10 is activated and kept for some time in the on state.

 At this time, voltage is applied and the pollutant turns on. The first melting cycle in RCC begins.

 The current circuit supplies power to the second and third intermediate relays 22 and 25. At the second intermediate relay 22, the opening contact 23 opens and the closing contact 24 closes in the power supply circuit of the third intermediate relay 25, which closes the making contact 26 in the shutdown solenoid circuit 27 However, the shutdown of the pollutant does not occur, since the NC contact 23 is open. When the switch is turned off for a dead time, the duration of which is usually not less than a minute, the contacts 23, 24 and 26 return to the initial state shown in the drawing. At the next work cycle, the described work is repeated.

 At the end of melting, during the last duty cycle, an automatic reclosure is introduced at the head switch, the action time of which is set within the reclosure period of 2 s and the head switch is turned on. Through failed to open the opening contact 23 of the second intermediate relay 22 and failed to open after the presence of current, making contact 26 of the third intermediate relay 25, the shutdown occurs.

 The application of the proposed control device makes it possible to conduct ice melting in RCC, which allows its use in networks with high currents.

Sources of information
1. A.S. N 390626. A method for remote control of a switching apparatus of an electrical installation / Livshits A.L., Khabibullin F.Sh., Filippov R.R. Publ. in B.I. N 30, 1973.

 2. Santotsky V.G. Automatic control of short-circuiting devices when melting ice in 10 kV networks. / Electrical stations, N 6, 1971.

 3. A. p. N 752588. Short-circuit-breaker control device in ice melting schemes / Rudakova RM, Usmanov F.Kh., Guzairov MB, Kurbanov IG Publ. in B.I. N 28, 1980.

 4. Rudakova R.M., I.V. Vavilova, I.E. Golubkov. Fighting ice in electric grid enterprises. / Bashkirenergo JSC, Ufa State Aviation University, Ufa, 1995.

Claims (1)

 Short-circuit breaker control device in ice melting circuits, located in the short-circuit point, containing a voltage transformer, a time relay with a slip contact, a first and second circuit breaker, a resistor, two diodes, a first capacitor, a first intermediate relay with a make contact, a contactor with two make contacts , first block contact, first diode bridge, switching electromagnet, second block contact, switching electromagnet, second diode bridge, second capacitor, second trans ormator, current transformer, where a time relay with a slipping contact is connected to the secondary winding of the voltage transformer through the first and second circuit breakers, as well as a branch consisting of a series-connected resistor, two diodes, a first capacitor, the output of which is connected to the first intermediate relay with a make contact , a contactor with two make contacts, connected in series with the first block contact, the first diode bridge, the output electromagnet is connected to the output, and Therefore, the current winding of the second transformer is connected to the current transformer, the second capacitor and the second diode bridge are connected to the voltage winding, at the output of which there is a shutdown electromagnet and a second block contact connected in series, characterized in that a second intermediate relay with a closing and the first NC contacts and the time delay during operation, the windings of which are connected to the output of the second diode bridge, and the third intermediate relay with a closing con act and time delay when returning the windings of which are connected through the normally open contact of the second intermediate relay, the first normally closed contact and the second normally open contact of the third intermediate relay connected in series with each other and through the second block contact with the winding of the electromagnet off.