SU1436178A1 - Arrangement for protecting three-phase diode rectifier - Google Patents

Abstract

The invention relates to electrical engineering and is used in converter equipment. The purpose of the invention is to increase reliability. In the phase of bridge 10, the contacts of the switch P and the current limiters 1, 2 and 3 are turned on. In the event of a short circuit, the current limiter reactors are saturated in the load 22, creating a non-linear resonant circuit like a filter plug, limiting the overload current. Contacts 7, 8 and 9, sensors 4, 5, 6 signal the drivers 13 and 15 of the thyristors 12 and 14, which take the load current 22, ensuring its recovery. With a delay, relay-19 is activated, the power supply is switched off from the power supply, and breaks the contact 16. The thyristors 12 and 14 are turned off. If at the same time the load 22 did not restore its normal mode, then a .0 delayed operation of the relay 17, which, by pin 21, supplies power to the disconnected coil 20 of the switch 11. 1 sludge with SS (L

Description

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This invention relates to electrical engineering and can be applied in protection devices for diode rectifiers.

The purpose of the invention is to increase the reliability of the diode top of the cell,

The drawing shows a device diagram for protection of a three-phase diode rectifier.

The device contains limiters 1; - 3 currents according to the number of phases of the rectifier, each loaded with sensor A - 6 currents with closing contacts 7–9 and connected by one pins to the corresponding | rectifier inputs | 10, and others directly connected

3 with one corresponding pins of the circuit breaker 1I, the other outputs of which are intended to connect to the source of the mains voltage. The first thyristor 12 with a driver formating 13 control pulses is connected to the negative pole of the detector 10, the second thyristor 14 with the driver of 15 guiding pulses connected to the positive pole of the rectifier and the cathode to one of the inputs of the converter and the anode of the first thyristor The inputs of the formers 13 and 15 of the first and second thyristors are combined and 1 through the trip contact 16 of the second time relay 17 and parallel connected contacts 7–9 of current sensors 4–6 are connected to source 18. power supply, the first time relay 19 is connected with the input, together with the input of the second time relay 17 through contacts; contacts 7 to 9 current sensors to the power supply 18. The control coil of the power switch 20 is connected to the power source 18 through the closing contact 21 of the first time relay 19. A load 22 is connected to the output of the rectifier 10.

A device for protection of a three-phase diode rectifier operates as follows.

In nominal mode, 4 current sensors do not close their contacts. As a result, the first and second time relays are de-energized, the formers 13 and 15i as well as the control coil, the network Bbw by the switch 20. The first 12 and second 14 thyristors are in the off state. In the case of overload current three-phase diode rectifier 10 current limiting occurs

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1 to 3 current limiters, current sensors are triggered, or one of them is closed through contacts 7-9. The power supply of the control units of the first 13 and second 15 thyristors and the power supply circuit of the first 19 and second 17 time relays switch the first 12 and second 14 thyristors, loading the load 12. With the back of this time, the second time relay 17 is activated and opens its trip 16, as a result, the first and second thyristors are locked. If the causes of the overload disappear, contacts 7 open. - 9 current sensors and the transducer continue normal operation. In the event of a stable overload, the contacts 7 to 9 of the current sensors remain closed, the second time relay is not de-energized. With the set time delay, the first time relay 19 is activated, with its contact 21 it closes the power supply circuit to the control switch of the power switch 20. The latter triggers and disconnects the hang-up from the network.

Claims (1)

Invention Formula h A device for protection of a three-phase diode rectifier containing current limiters for the number of phases, rectifier, each equipped with a current sensor with closure contacts, and intended to be connected by one switch to the corresponding rectifier inputs, and connected to one switch of the main switch by other switches equipped with a control coil, the other outputs of which are intended to be connected to the mains voltage source, the first time relay connected by the input through parallel-connected contact loops The current sensors are connected to the power source, and the output closing contact is connected between the power source and the control coil of the power switch, characterized in that, in order to increase reliability, it is the first and second thyristors with control formers and the second time relay. The first thyristor by the cathode is intended to be connected to the negative pole, the pole of the mitel, the anode to one of the rectifier inputs and the cathode of the second 31436178: a thyristor, the anode of which is intended to be connected via an open contact whose connection to the positive second time relay to the source of the rectifier pole, power supply inputs, and other outputs of the current pulse limiters are connected to the same terminals and the second thyristors are combined and power switch directly.