SU1628122A1 - Circuit overvoltage protection device - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use in protection circuits of electrical circuits connected to different types of power supply with a common bus. The aim of the invention is to provide protection against unauthorized overvoltages caused by short

Description

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them eamykd. shchmi t-wait tshchikl-. electrical circuits connected to different potential sources of electrical circuits. Under normal power supply, loads from opposite sources 1,2, 3,4 power supply of the group of zener diodes 6, 7,8,9, included each between the output of the protected electric circuit and the common power supply voltage of the protected circuit, and protective thyristors 11,12,13, 14, included) every counter-parallel to the corresponding group of str - bilntronop, are closed. If a surge occurs in any m of the protected chains of the response-to-sch group, the stubbing rifles break through, locking:

chivi and overvoltage, while at the output of the corresponding three-input resistor splitter 15,16,17,18 voltage, the input connected to this electrical circuit, a signal is generated to one of the comparators 19,20,21,22, from the output of which the signal through The switching 10 inverters are applied to the control electrode of the corresponding 11,12,13,14 thyristor. The latter is triggered by connecting an electrical circuit under the influence of an overvoltage to a common supply source, which prevents it from being released: an overvoltage. 1 il.

The invention relates to medical technology and is intended for operating and protecting circuits for electrical circuits connected to multi-source power sources with a common bus.

The purpose of the invention is to provide SriiiyiTii from unauthorized voltages, RFs from short to i-ms ms) protected; xycryscop; e (pluggable

NUPSTSCHTS1i L - 1CH1M NS. THAT SHIKAM PNT. I am.

CSM Ustronstpl presented y1

drawing

The device for searching for electrical transmission of h: circuits, connected to sources 1 J, 3, 4 pits; h with a common bus 5, contains a group of 11 liters of bilitrons, 7.8, Y with a jack of the KjjiKvioH group stabilizers between the output of the protected electric circuit, the common power supply source and the opposite polarity of the voltage of the circuit to be protected, and the inverter elements, which represent the otkuyuch Slok 10 inverters. The device contains, but the number of protected eegpric circuits, pinch thyristors 11, 12,13,14, three-input resistor dividers 15,16,17,18 voltages, comparators-adders 19,20,21,22 n reference voltage source 23,

The power circuits of the protective thyristors 11,12,13,14 included the opposing rounds correspondingly to the groups of etacillones 6,7,8,9 between were pulled out to connect the groups of stabilizers

for the supply of electric circuits and to the source of power sources. Per-; ihin the second inputs of each divider H141) serve as outputs for wiring; n this voltage divider to the wiring of two generations and eight electrical circuits connected to the same field with respect to the common bus sources ghpchanch

and the third entry of each

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 imit ™ service is used for pods (1) to the busbar, each voltage divider is made to three main switches, the first pins are connected to the corresponding inputs of this aelitel, and the second pins are to its t-output connected to one input of the corresponding comparator-adder. The other input is connected to the source 23 of the reference voltage ,, The output of each comparator-adder through the disconnecting inverter unit 10 is connected with the control electrode of the corresponding protective thyristor

The disconnecting unit 10 is made on inverters 24-28, resistors 29-34, thyristor 35 and executive relay 36 "

The device works as follows

Under normal power supply conditions, loads from sources 1,2,3,4 stabilitrons 6,7,8,9 and thyristors 11,12,13, 14 are closed

In the event of overvoltage of any type of electrical circuits, the corresponding zener diodes 6,

5I

9 are tested, limiting the amount of overvoltage to permissible levels. At the output of the corresponding three-input resistor divider 15,16,17718, a signal is input to the input of the comparator 19,20,21,22 connected to the output of the three-input resistor of the voltage divider. The comparator, by switching, generates a signal acting on the input of the switching unit

10invertors. From the output of the switching unit 10, a signal is applied to the control electrode of the corresponding protective thyristor 11,12,13,14, which is triggered by connecting an electrical circuit under the influence of overvoltage to the common power supply busbar, which results in the overvoltage being removed. In the switching unit 10, simultaneously with the signal output to the control electrode of the protective thyristor 11,12,11,14, a signal is applied to the control electrode of the thyristor 35. The latter opens and actuates the operating relay 36, which by its contacts turns off the power supply for sources 1,2,3, 4 from the primary supply network. Subsequent connection of 1-source to the primary mains supply is possible after elimination of the malfunction that caused the overvoltage.

Claims (1)

Invention Formula An overvoltage protection device for electrical circuits connected to different-pole power sources with a common busbar, containing groups of zener diodes with leads for connecting each group of voltages five 0 five 0 five 0 An electrical circuit and a power supply busbar are opposed to the voltage of the protected circuit and an inertial element, characterized in that, in order to provide protection against unauthorized overvoltage caused by short circuits between the protected electrical circuits, they are connected (- to different potential supply voltages, the device includes, according to the number of electrically protected circuits, three thyristors, reenistor voltage dividers, comparators-adders and a source of reference voltage, moreover, cathode-anodic The aai yiTnnx thyristor circuits are connected in parallel with the corresponding groups of zener diodes between the terminals for connecting the group of zener diodes to the circuit of the SCI circuit and the common power supply bus; electrical connectors connected to the same power supply to the common I linibi poultry houses, and the third input of each divide the voltage SERVED for connection to the common bus, each voltage divider running It is in the form of trgh resistors, the first pins connected to the corresponding inputs of this divider, and the second terminals are connected to its output, which is connected to one input of the corresponding comparator-adder, the other input of which is connected to the source of the reference voltage, and the output of each comparator The -cvMMaTopa is connected via an inverting element to the control electrode of the corresponding protective thyristor.