SU1446670A1 - Device for monitoring phase=failed duties of three-phase network - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use in control and automation circuits. The purpose of the invention is to increase the service life and life of on and off. If all the mains phases are present, after turning on the automatic switch 10 and briefly pressing the 4 Start button. IY through the .iY resistor 6 unlocks the symmetrical thyristor, actuator 2 turns on, which bypasses the start 4 contact block. The chain 11.12 protects the actuator 2 from inadvertently turning on when the monitored network is energized and is disconnected by pin 13 after switching on the actuator 2, which is turned off by pressing the 5 Stop button. When the voltage of one of the network phases disappears, executive unit 2 is turned off, indicating that the monitored network does not operate in full phase. In the case of sampling of a symmetrical thyristor 1, the executive unit 2 is disconnected from the controlled network by an automatic switch 10. 1 sludge. b (L 4 4 F h h

Description

The invention relates to electrical engineering and is intended for use in control and automation circuits.

The purpose of the invention is to increase the service life and life of on and off.

The drawing shows a diagram of a device for monitoring half-phase modes of a three-phase network.

The device contains a symmetrical thyristor 1 (controlled switch with two-sided conductivity) connected in series with the executive unit 2, clamping the block-con-. the cycle 3 of which shunts the Start button 4, included in the control electrode circuit of the symmetric thyristor 1 in series with the Stop button 5 and the resistor 6. Device outputs 7 9 are used to connect to the phases of the monitored network. Pin 7 of the device through the first contact of the three-circuit-breaker

10 is connected to the executive body 2. The output 8 of the device through the second contact of the automatic switch 10 is connected to the symmetrical thyristor 1. The output 9 of the device is connected via the third contact of the automatic pin 10 to the disconnecting switch: a tact of the Stop button 5. The chain consisting of the resistor 11 and the capacitor 12 is connected through the disconnecting: block contact 13 of the actuator 2 in parallel to the circuit consisting of sequentially connected symmetric thyristor 1 and the executive body 2.

The device works as follows.

After turning on the automatic switch 10 by briefly pressing the Start button 4 through the Stop button 5 and the resistor 6, the symmetric thyristor 1 is opened, and then. actuator 2 is turned on and, with its closing contact-contact 3, shunts the start button 4, after the start button OCBO, the actuator 2 remains in the on state, as in the normal state of the monitored network the thyristor 1 remains constantly open under the influence of the Phase C voltage controlled network through. After the blocking contact 3 of the executive body 2. A chain consisting of a resistor 1 1 and a capacitor 12 removes overvoltages from the symmetric thyristor 1, preventing the spontaneous activation of the executive body 2 as a result of the possible unlocking of the tristor 1 at the moment of connecting the device to the controlled network when the circuit breaker 10 is turned on. The chain of elements 11 and 12 after switching on the executive body 2 is turned off using its disconnecting block contact 13, which prevents useless energy consumption rgii in this thread.

Executive 2 is switched off when any phase of the monitored network is lost. The actuator can be restarted only after the network voltage has been restored by briefly pressing the Start button 4. If necessary, the executive body 2 can be turned off by briefly pressing the Stop button 5. The circuit breaker 10 is designed to disconnect the device from the monitored network during interruptions, inspections and preventive maintenance.

The automatic cut-out also provides for switching off the device in case of a breakdown of the thyristor 1, when the device cannot be switched off using the Stop button.

Claims (1)

Invention Formula A device for controlling three-phase network half-phase modes, containing a controlled switch with two-way conductivity on a switched circuit, an actuator with a closing contact, start and stop buttons, the first resistor and three terminals for connecting to the phases of the monitored network, and the control input the actuator is connected in series with the switched switch controlled circuit, the closing contact of the Start button is shunted by the closing contact of the actuator, and the first resistor is turned on therefore, a triple circuit breaker, a second resistor, and 314 the capacitor, the executive body is equipped with a disconnecting blocking contact, and the controlled switch is made in the form of a symmetric thyristor, the first output of the switched circuit of which is connected to the first output of the control input of the executive body, the second output of which is connected through the first contact of the automatic switch to phase of the monitored network, the second output of the switched circuit through the second contact of the automatic switch is connected to the second output for connection to another phase monitored my network and control output com the mutator through the serially connected closing contact of the Start button, the first resistor, the disconnecting contact of the Stop button and the third contact of the circuit breaker are connected to the third output for connection to the third phase of the monitored network, and between the second outputs of the switching circuit of the switch and the control input of the executive body a chain is switched on from series-connected disconnecting block contact of the executive body, the second resistor and capacitor.