RU1812590C - Device for protection from false operating of execution devices of electric equipment - Google Patents

Abstract

The device for protection of executive-elements of Coils contains re-closing keys, a power source, an operating mode switch with opening, switching and closing contacts, a zener diode, current-limiting resistors, transistor optocouplers, an inlet block and provides protection of relay coils from false alarms and a contact role communication lines. 1 ill.

Description

. The device relates to electroautomatics and can be used in remote control devices for actuators.

 The purpose of the invention is the expansion of function; the local capabilities of the device by expanding the different types of damage to which the protection responds: ta-: --.... : - ;. . -. ..:. ....,: - .; :; - ;;; - The traditional use of optrondb, and, in particular, transistor optocouplers, 6 devices where galvanic isolation of the circuits is required, is known. The use of transistor optocouplers in combination with a zener diode and the indicated connections in the claims made it possible to provide constant monitoring of both the presence of a circuit of galvanically separated circuits and the monitoring of their Integrity and with the help of a protection and control unit; firmirovanie commands on OFF-. goal, the closure of which may

lead to emergency connection of redundant circuits instead of broken ones.

The drawing shows the proposed device. ;. ;; .. ;;,; ., ...., ...,., - ;;;., .-., ...

The device contains actuating elements - relay coils 1-3, closing Keys 4-6, terminals 7.8 for connecting the scripture source, mode switch 9 with NC contact 9-1, switching 9-2, NO contact 9-3, zener diode 10 , resistors 11-13, transistor optocouplers 14-16, output unit

/ 17 .; ; .., ;; ./.; ..;.,.,.:, -; ........:, ..; ....:

The output unit 17 is used to receive information about the status of communication lines and, in the event of a message about failure, (violation) of communication lines of type KZ or open, it gives a signal either to disconnect the failed or to connect redundant circuits.

This block can be any known device that solves this

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task. So, for example, the output unit 17 can be built on the logical elements AND, OR, RS-flip-flops or made in the form of a relay-switching device.

The first conclusions of relay coils 1-3 are connected to one of the terminals for connecting a power source, the second conclusions of relay coils are connected via shorting keys 4-6 to another terminal for connection. source of power. The switching contact 9-2 of the control mode switch 9 is connected through resistors 11-13, respectively, to the anodes of the LEDs of transistor optocouplers 14-16, the cathodes of which are connected to the connection points of the closing contacts of the keys 4-6 with the second terminals of the actuator relay coils 1-3. Optocoupler transistor collectors , as well as emitters / interconnected at a common point, connected to the inputs of the control and protection unit. In addition, the NC contact of the mode switch is directly connected, and the NC through the zener diode is connected directly to the first terminal to connect the power source.

The device operates as follows.

In the position of the switch 9, when the contacts 9-1 and 9-2 are closed, the integrity of the control circuits of the executive relays 1-3 is continuously monitored. In this case, current flows through the contacts 9-1, 9-2, resistors 11,12,13, diodes of the transistor optocouplers, and provides an open state of the transistors of the optocouplers. Information about the state of the circuits through transistor optocouplers 14-16 is supplied to the output unit 17. In the absence of an interruption of the control circuit (circuits), current flows through the optocoupler LEDs, the transistors are in an Ј 6 open state. At the inputs of the output block 17 control receives a signal from the collector transistor optocouplers. In the event of a breakdown in one or more control circuits, the current through the corresponding light emitting diode (LEDs) is stopped, the transistor (s) are turned off, the signal level at the corresponding input of the output unit 17 is changed. .

In the position of the switch 9, when the switching contact 9-2 is closed and the making contact 9-3, a short circuit (short circuit) is monitored between the actuator relay control circuits. When the device is in good condition (if there is no short circuit between the control circuits) through the zener diode 10, limit resistors. 11-13 and the corresponding diodes of the optocouplers 14-16, a small current flows. optocoupler transistors 14-16 are closed.

If there is a short circuit between the control circuits (e.g. AB), through the zener diode and corresponding optocoupler diodes, the current increases due to a decrease in the equivalent circuit resistance (two windings connected in parallel instead of one). The transistors of the respective optocouplers open. At the inputs of the output block 17

A signal appears. Defective circuits (if necessary) are disconnected.

As shown by the technical analysis and the results of experimental studies, the proposed device provides protection

actuators from false positives and, in addition, unlike the prototype provides control of the integrity of communication lines, i.e. has wider functional capabilities.

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SUMMARY OF THE INVENTION Device for protecting against false operation of actuating elements of an electrical installation, comprising a source

power supply, the first terminal of which is connected to the first terminals of the first NC contact of the mode switch and the closing keys, the second terminals of the latter are used to connect the corresponding actuator to the first terminal, the other terminal of the power source is used to connect the actuator to the second terminals, output unit, distinguishing it so that, in order to increase the Reliability of control, additionally

series resistors and transistor optocouplers, a zener diode,

wherein the zener diode cathode is connected to the first output of the power source, the anode -. to the output of the second make contact of the mode switch, the output of the switching contact of which is connected to

the second conclusions of the resistors, the cathodes of the diodes of the transistor optocouplers are connected to the second conclusions of the corresponding short-circuit keys, the emitters of the transistor optocouplers are combined and connected to

the first input of the output unit, to the other inputs of which the collectors of transistor optocouplers are connected.