SU752588A1 - Apparatus for controlling short circuiting switch in glaze-ice fusion circuits of power transmission lines - Google Patents

Description

The invention relates to the electric power industry and can be used to control a short-circuit breaker on power lines, the melting of which is carried out by 5 low voltage.

Control devices for switching apparatuses of electrical installations are known based on the transmission of encoded information via a special communication channel, for example, telephone, as well as through power wires using special high-frequency equipment Щ. However, the presence of a communication channel due to its low reliability in the presence of icy deposits reduces the effectiveness of the use of control devices.

The closest technical solution to the proposed one is a short-circuit breaker control device in ice melting circuits on power lines, which contains a spring drive with a universal collector motor, a current transformer built into the circuit breaker, a current relay and a make-up transformer connected to the WTO. current transformer winding, 30 blocks of capacitors connected in series with isolation diodes. [2J

The use of an oil transformer in this device significantly increases the cost of the device. The use of a time relay as an indicator for turning on the device makes high demands on the accuracy of the command signal sent from the control point and reduces the reliability of the circuit. In addition, the supply of alternating voltage to the engine impairs its traction characteristics, which also affects the reliability of the device.

The purpose of the invention is to increase the reliability while reducing the cost of the device when melting ice on lines having a melting voltage less than the nominal.

This goal is achieved by the fact that the short-circuit breaker control device in ice melting circuits on power lines, containing a spring drive with a universal collector motor, a current transformer built into the circuit breaker, a current relay and a make-up transformer connected to the secondary winding of the current transformer, capacitor banks connected in series with dividing diodes, equipped with a voltage transformer connected to the lines, 'relay maximum and minimum voltage connected to the secondary winding of the voltage transformer, a rectifier bridge, and the bridge is connected to the voltage transformer through series-connected voltage relay contacts, the motor is connected to the bridge output.

The drawing shows a diagram of a control device short-circuit breaker.

The circuit of the control device for circuit breaker 1 consists of a voltage transformer 2, a maximum voltage relay 3 with terminal 4, a minimum voltage relay 5 (terminal 6) of an intermediate relay 7 (terminals 8, 9, and 10), a time relay 11 (terminals 8, 9 and 10 ), a time relay 11 (pin 12), an intermediate relay 13 contacts 14, 15, 16 and 17) of the rectifier bridge 18, a motor 19 for charging the drive springs, contact 20 for readiness of the drive, terminal block 21, 22 and 23 of the switch, switching electromagnets 24 and shutdown 25, diodes 26, 27 and 28, and capacitors 29 and 30, current transformer 31, current th relay 32 '(pin 33), the charging unit 34, step-up transformer 35 and a disconnector 36.

The disconnector 36 is used to turn off the device for the summer period and to carry out repair work on the switch. The voltage transformer 2 is designed to control the magnitude of the voltage in the line and the power supply of the control device of the switch. Relays of maximum 3 and minimum 5 voltages are indicators of suppressing a melting voltage line, their series-connected contacts operate simultaneously and give an impulse to turn on the device only when a melting voltage is applied to the line, since contact 4 of maximum voltage relay 3 closes when an equal voltage is applied to the line or higher voltage of the melt, and contact b relay 5 of the minimum voltage is equal to or less.

The intermediate relay 7, when a nominal voltage is supplied to the line, turns on the heating elements of the drive cabinet and turns off the transformer 35, which serves to charge the capacitors on 29 and off 30 and power the motor 19, due to the appearance of a large voltage on it. The rectifier 18 serves to rectify the current, since the traction characteristics of the DC motor are improved. Diodes 26, 27 and 28 are used to charge and separate the circuits of capacitors, 29 and 30. The current transformer controls the presence of the current of the handkerchief in the line and, in combination with the recharge unit 34, serves to recharge the disconnecting capacitor 30 during the melting process.

When a nominal voltage is applied to the line, a voltage relay is activated, and the maximum voltage relay 3 closes its contact 4, and the minimum voltage relay 5 opens contact 6. At the same time, the intermediate relay 7 activates and contacts 8 and 9 turn on the cabinet heating, and contact 10 turns off the transformer 35 So Thus, the control circuit does not work when the nominal voltage is applied to the line.

When a melt voltage is applied to the line, the intermediate relay 7 does not work, while the cabinet heating is turned off, and the transformer .35 is connected to the output of the voltage transformer. · Contacts 4 and 6 of voltage relays 3 and 5 are closed and voltage is supplied to the intermediate relay 13 which closes contact 14 in the charge circuit of capacitors 29 and 30, pin 15 blocking contacts 4 and 6 of voltage relay 3 and 5 to prevent the circuit from tripping due to a voltage drop on transformer 2 during operation of the spring charging engine 19, pin 16 in the charging circuit of the rod, , VK yuchaya it into operation, and opens the contact 17 in the circuit of the electromagnet 25 is turned off. At the end of the cocking of the springs, the actuator ready contact 2.0 is activated, it switches on the time relay 11, which, with the time delay necessary for the actuator to be completely ready, closes contact 12 in the circuit breaker circuit.

After turning on the voltage switch at the place of its installation and, accordingly, at the input of the control circuit, it decreases to zero and the circuit turns off. At the same time, a melting current appears in the line, which, through the current transformer 31, is supplied to the current relay 32 and the power supply unit 34. The current relay 32 opens its contact 33 in the trip circuit, and the contact 17 of the intermediate relay 14 closes after a voltage failure with a time delay, which allows avoiding the circuit breaker immediately after it is turned on. The recharge unit energizes the shutdown capacitor 30 during the melting process to prevent its self-discharge.

After the ice is melted to the line, the switch at the substation from which the melting is performed is switched off by the duty officer, the current in the line disappears, the current relay 32 closes its contact 33 in the circuit of the electromagnet 25 and the short-circuit breaker 1 is turned off. The line is ready for inclusion in the work.

The application of the proposed control device can improve the reliability of the short-circuit breaker and reduce the cost of the control circuit.

Claims (2)

Capacitor blocks connected to the secondary winding of the current transformer, in series with separation diodes, are equipped with a voltage transformer, connected lines, a maximum and minimum voltage relay connected to the secondary winding of a voltage transformer, a rectifying bridge, and the bridge is connected to a transformer rum voltage through series-connected contacts of the voltage relay, the motor is connected to the output of the bridge, The drawing shows a diagram of the control device of the shorting switch eat. The circuit breaker control circuit 1 consists of a voltage transformer 2, a maximum voltage relay 3 with a contact 4, a minimum voltage relay 5 (a contact of an intermediate relay 7 (pins 8, 9, and 10), a time relay 11 (pins 8, 9 and 10), time relay 11 (pin 12), intermediate relay 13, contacts 14, 15, 16, and 17) rectifying bridge 18, motor 19 for charging up the actuator spring, contact 20, ready for water, block-contacts 21, 22 and 23 a switch, electromagnets on and off 24 and 25, diodes 26, 27 and 28, and capacitors 29 and 30, current transformer 31, currents relay 32 (pin 33), subunit unit 34, step-up transformer 35, and disconnector 36. Disconnector 36 serves to disconnect the device for the summer period and to carry out repair work on the switch. The voltage transformer 2 is designed to control the magnitude of the voltage in the line and to power the switch control device. The relays of maximum 3 and minimum 5 voltages are indicators of flow in the melting voltage line, their serially connected contacts operate simultaneously and give a pulse to turn on the device only when the melting voltage is applied to the voltage line, since contact 4 p 3 of maximum voltage It closes when a voltage equal to or greater than the melting voltage is applied to the voltage line, and the contact 6 of the minimum voltage relay 5 is equal to or less than th. Intermediate relay 7, when applied, the nominal voltage line turns on the heating elements of the drive cabinet and turns off the transformer 35 used to charge the switching capacitors 29 and turn off 30 and power the engine 19, due to the appearance of a large voltage on it. rectifying the current, as I improve the motor tractive characteristics on the direct current c. Diodes 26, 27, and 28 serve to charge and separate the capacitors 29 and 30. The current transformer monitors the presence of the firing current in the line and, in combination with the charge block 34, serves to charge the disconnect capacitor 30 during the smelting process. When a rated voltage is applied to the line, a voltage relay is triggered, the maximum voltage relay 3 closes its contact 4, and the minimum voltage relay 5 opens the contact 6. At the same time, the intermediate relay 7 is activated and the contacts 8 and 9 turn on the cabinet heating and turn off 10 transformer 35 Thus, the control circuit does not work when the rated voltage is applied to the line. When a melting voltage line is supplied to the line, the intermediate relay 7 does not work, while the cabinet heating is turned off, and the transformer .35 is connected to the output of the voltage transformer. Contacts 4 and 6 of voltage relay 3 and 5 are closed and the voltage goes to intermediate relay 13 which closes contact 14 in the charge circuit of capacitors 29 and 30, contact 15, which blocks the contacts 4 and 6 of relay 3 and 5 voltages to prevent the circuit from turning off due to the voltage on the transformer 2 when the spring charging engine 19 is operating, contact 16 engine circuit platoon pru-, Zhin, turning it into operation, and opens contact 17 in the circuit of the electromagnet 25 of the shutdown. At the end of the spring charging, the drive readiness contact 20 activates the time relay 11, which, with the time delay necessary for the drive to become fully operational, closes contact 12 in the switch-on circuit. After turning on the voltage switch at the place of its installation and, accordingly, at the input of the control circuit, it decreases to zero and the circuit is turned off. Simultaneously, a melting current appears in the line, which through the current transformer 31 is supplied to the current relay 32 and the power supply unit 34. The current 32 relay opens its contact 33 in the trip circuit, and the contact 17 of intermediate relay 14 glitches after the voltage has disappeared with a time delay to avoid switching off the switch immediately after it is turned on. The charging unit feeds the shut-off capacitor 30 during the smelting process to prevent self-discharge. At the end of ice melting on the line, the switch at the substation from which the melting is performed is turned off by the duty officer, the current in the line disappears, the current relay 32 closes its contact 33 in the circuit of the electromagnet 25 of the shutdown and the shorting switch 1 is turned off. The line turns out to be otovo for inclusion in the work. The use of the proposed control device allows to increase the reliability of the shorting switch and reduce the cost of the control circuit. The invention The control device by a shorting switch in ice melting circuits on power lines contains a spring drive with a universal collector motor, a current transformer built into the switch, a current relay and a charge transformer connected to the secondary winding of the current transformer, capacitor blocks connected connected. With separation diodes, characterized in that, in order to increase the reliability of operation while simultaneously reducing the cost of the device when melting ice on No, the melting voltage is lower than the rated voltage, it is equipped with a voltage transformer connected to the line, a maximum and minimum voltage relay connected to the secondary winding of the voltage transformer, with a rectifying bridge, the bridge being connected to the voltage transformer via serially connected contacts a voltage relay and a motor connected to the output of the bridge. Sources of information taken into account in the examination 1. Reference book on the design of information transmission systems in the energy sector. Ed. V.H. Ishkina, S. G. Rokot on, Energie, 1977. 2. Satnotsky V. G. Automatic control of shorting devices when melting ice in networks x 10 kV. - Electric stations, 1971,.