SU1476564A1 - Apparatus for turning on and protection of three-phase consumer from incomplete phase modes - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use in relay protection of electrical installations. The purpose of the invention is to increase reliability by preventing the consumer from being switched on to a full phase mode by pressing the "Start" button. During the positive half-cycle of phase A, an optocoupler LED 10, a rectifier 4, a 6 “Start” button, a break contact 13 of the relay 16, and a resistor 12 are flowing through the LED. The photothyristor of the optocoupler 10 opens. During the positive half period of phase B, the photothyristor of the optocoupler 11 opens, then the photothyristor 8 of the optocoupler 9 opens during the positive half-phase of phase C, the relay 16 is turned on, the closing coil 15 of which energizes the coil 14 of the starter 2. The starter operates, closes the contacts 3 and held in the on state by the current flowing through the contacts 3, the rectifier 5 and the photo thyristor 8. At the same time, the contact 13 is opened and the power consumption by the resistor 12 stops. on April zhenii one phase wearer fototiristory 1 8 is closed, the actuator 2 is turned off, preventing work in two phases. In the absence of one of the phases of the network at the moment when the "Start" button 6 is pressed, the photo thyristor 8 does not open, which prevents the user 1 from switching on to the incomplete phase supply. In case of incorrect phase sequence of the network when the start button 6 is pressed, the photothyristor 8 also does not open and the voltage on the consumer 1 is not applied. 1 il.

Description

1147656

The invention relates to electrical engineering and is intended for use in relay protection of electrical installations.

The purpose of the invention is to increase reliability by preventing the consumer from switching to an incomplete-phase mode by pressing the Start button.

The drawing shows a diagram of the JQ device.

A device for switching on and protecting a three-phase consumer 1 from non-full-phase modes comprises an actuator

with a zero wire of a power line. The coil 14 of the magnetic actuator 2 through the closing contact 15 and the relay 16 is connected to two phases of the mains supply. The relay 16 of the starter 2 is connected in series with the resistor 17. The resistor 17 and the relay 16 are shunted by an RC circuit consisting of a capacitor 18 and a resistor 12.

The device works as follows.

With the correct alternation of the phases of the mains supply positive half

2 with power contacts 3, supply-15. o phase A through the second LED

leads to connect each power contact to the power line of the corresponding phase of consumer 1, in the three-phase half-wave first .4 and second 5 rectifiers, 6 20 Start and 7 Stop buttons and the first thyristor 8, made in the form of the photo thyristor of the first optocoupler 9. The first input of the first LED 4 through LED

the optocoupler 10, the first input of the rectifier 4, the button 6 Start, the disconnecting contact 13 of the relay 16 of the actuator 2 and the resistor 12 unlocks the photo-thyristor of the optocoupler 10. Positive phase half-period B through the photo-thyristor of the optocoupler 10, the LED of the optocoupler 11 and the second output of the rectifier 4 on the above circuit is unlocked photothyristor

The second optocoupler 10 is connected to the output of the 25 optocoupler 11. The positive half period of phase C through the photo thyristor of the optocoupler 11, the LED of the optocoupler 9 and the third input of the rectifier 4 on the above circuit unlocks the photo thyristor 8 of the optocoupler 30 to 9. At the same time, the rectifier 4 through the photo thyristor 8 optocoupler 9, button 7 Stop and resistor 17 turns on relay 16 of actuator 2. At that, through the closing contact 15 of relay 16 by turning on the first power contact 3 of actuator 2 from the power supply side, the second input of the first rectifier 4 iepes is a serially connected photothyristor of the second opt Ron 10 and the LED of the third optocoupler 11 are connected to the output of the second power contact 3 of the actuator 2 on the supply side; the third input of the first rectifier 4 is connected in series through the coil 14 of the actuator 2 and the locking 40

The first photothyristor of the third optocoupler 11 and the LED of the first optocoupler 9 are connected to the output of the third power contact 3 of the actuator 2 on the supply side. The output of the first rectifier 4 is connected to the first output of the closing contact of the Start button 6. The inputs of the second rectifier 5 are connected to the power line of the corresponding phase of the consumer 1 between the power dd contacts 3 of the actuator 2 and the consumer 1, and the output of the second rectifier 5 is connected to the first power electrode of the first thyristor 8 ,. the second power electrode of which through the disconnecting contact of the button 7 Stop is connected to the first output of the actuator 2, the second output of which is connected to the neutral wire of the power supply network. Wr50

its power contacts 3. After the release of button 6, the start-up of the starter 2 is held in the on state, since the photo thyristor 8 of the optocoupler 9 remains open under the influence of the output voltage of the rectifier 5. The relay 16 of the actuator 2 is constantly on. Consumer 1 is connected to the mains. The contact 13 of the relay 16 is then opened, and the power consumption through the resistor 12 is stopped. When the voltage disappears in one of the supply mains phases or if one of the contacts 3 fails, the actuator 2 stops the flow of current through one of the rectifier diodes 5, the photo thyristor 8 closes, the starter 2 turns off, preventing the button contact 55 two phases. Without

6 Start is connected to the output of the second rectifier 5 and through series-connected resistor 12 and disconnecting contact 13 of the actuator 2 of one of the mains phases at the moment of pressing the button 6 Starting the photo thyristor 8 of the optocoupler 9 does not open, which prevents the user 1 from turning on

the optocoupler 10, the first input of the rectifier 4, the button 6 Start, the disconnecting contact 13 of the relay 16 of the actuator 2 and the resistor 12 unlocks the photo-thyristor of the optocoupler 10. Positive phase half-period B through the photo-thyristor of the optocoupler 10, the LED of the optocoupler 11 and the second output of the rectifier 4 on the above circuit is unlocked photothyristor

coil 14 actuator 2 and closure

its power contacts 3. After the release of button 6, the start-up of the starter 2 is held in the on state, since the photo thyristor 8 of the optocoupler 9 remains open under the influence of the output voltage of the rectifier 5. The relay 16 of the actuator 2 is constantly on. Consumer 1 is connected to the mains. The contact 13 of the relay 16 is then opened, and the power consumption through the resistor 12 is stopped. When the voltage disappears in one of the supply mains phases or if one of the contacts 3 fails, the actuator 2 stops the flow of current through one of the rectifier 5 diodes, the photo thyristor 8 closes, the starter 2 turns off, preventing the power supply from the power supply phases from pressing button 6 The start of the photo thyristor 8 of the optocoupler 9 is not unlocked, which prevents the user from turning on 1

J1

on an incomplete network voltage. In the event of incorrect phase alternation of the mains when pressing the button 6, the start of the photo thyristor 8 of the optocoupler 9 also does not open, the starter 2 does not turn on, the voltage to the consumer 1 is not energized. The starter 2 turns off by pressing the Stop button. The control of low-power consumers as a starter can use one relay 16. At the same time, consumer 1 is started through its closing contacts without using a powerful coil 14, which greatly simplifies the starter circuit and increases its reliability.

The positive effect of the invention is to increase the reliability

Claims (1)

devices by preventing the optocouplers and the third optocouplers, the resistor, and disconnecting the consumer to the non-full-phase mode by pressing the Start button, which reduces the possibility of emergency situations at the time of the electrical installations start-up. Invention Formula A device for switching and protecting a three-phase consumer from half-phase modes, containing an actuator with power contacts, equipped with leads for switching each power contact to the power line of the corresponding consumer phase, three-phase single-half-first and second rectifiers, start and stop buttons and the first thyristor The output of the first rectifier is connected to the first output of the closing contact of the Start button, the inputs of the second rectifier are equipped with terminals for connecting each input to the power line corresponding to consumer phase between the power contacts of the actuator and the consumer, and the output of the second rectifier is connected to the first power electrode of the first thyristor, the second power electrode of which through the break contact of the button. The stop is connected to the first control output of the actuator, which is equipped with a second control output for connecting to the zero conductor of the supply mains, characterized in that, in order to increase reliability by preventing the consumer from switching on to the incomplete phase mode by pressing the Start button, the first thyristor is made the photothyristor of the first optocoupler and the photothyristor of the second the tactile contact of the actuator, the first input of the first rectifier through the LED of the second optocoupler connected to the output of the first power contact the starter from the mains side, the second input of the first rectifier is connected through a series of photo-thyristor of the second optocoupler and the LED of the third optocoupler is connected to the output the second power contact of the starter from the mains side, the third input of the first rectifier through the phototiristor of the third optocoupler connected in series and the LED of the first The optocoupler is connected to the output of the third power contact of the actuator from the mains side; the second output of the closing contact of the Start button is connected to the output of the second rectifier and through a sequentially connected breaker contact and a resistor to the second control output of the starter.