SU750642A1 - Device for protecting and monitoring multichannel switching apparatus - Google Patents

Description

one

The invention relates to electrical engineering and can be used in high-power pulsed power systems, in particular, in plasma power systems.

In high-current switches consisting of several controlled dischargers or gates connected in parallel, there are two types of malfunctions in the operation of each of the parallel branches, namely skipping the switch-on or untimely actuation (self-switching) of the gates.

A known switch control circuit that is based on the use of a known single-channel device for monitoring the status of gates containing a valve current sensor, one of the terminals of which is connected to the first trigger input, another output and trigger output are connected to the coincidence circuit inputs, and the second trigger input is connected to the source of the control pulses of the valve Ij.

Such a device provides only an indication of untimely valve actuation caused, in particular, by their breakdown.

A device that is closest to the technical essence and achievable 4 of the invention is known, which contains a current sensor in each channel, the outputs of which are connected to one of the inputs of the corresponding trigger with direct and inverse inputs, as well as a coincidence element, one of the inputs of which connected to the first output of the imaging unit time intervals 2.

In the indicated device, which allows to indicate any deviation from normal operation in each branch of the switch, it is not possible to separate the signal by the type of violation of the connection, or valves, which is necessary to ensure the selectivity of protection. In addition, the use of several such devices (according to the number of parallel channels of the switch) leads to a significant complication of the display system.

The purpose of the invention is to extend the functionality of the device.

Claims (2)

This is achieved in that the device is equipped with two And elements and an additional match element, the second output of the time interval generator is connected to one of the inputs of the additional match element, and the other two inputs of the match elements are connected to the output, one of the And elements whose inputs are connected to inverse the outputs of all the triggers, the direct outputs of which through the second element I are connected to other inputs of the triggers, and the output of the elements of the coincidence is connected to the third input of the additional element with the fall FIG. 1 is given a functional diagram of the proposed device; in fig. 2 - timing diagram of input and output signals of individual elements. Each controlled channel of the switch contains a current sensor 1 with an output connected to one of the inputs of the corresponding trigger 2. The inverse outputs of all the flip-flops are connected to the inputs of the And 3 element, the output of which is connected to the first inputs of the matching circuits 4 and 5, the second inputs of the matching circuits are connected to two the outputs of the time interval generator 6. The third input of the matching circuit 5 is connected to the output of the matching circuit 4. The direct outputs of the flip-flops are connected to the inputs of the second element And 7, the output of which is connected to the second inputs of these triggers .. The device works as follows. When the load current (Znlgr ..) passes through the switch branches in each channel, the trigger 2 is transferred by a pulse from the current sensor 1 to a state in which a potential arises at its direct output and disappears in an inverse state. In the case of the operation of all the current sensors at the output of the element And 7, a signal appears, which resets all the triggers to the initial connection. At the same time, potentials arise at all inverse outputs of the flip-flops, at the output of the And 3 element and, therefore, at the inputs of the coincidence circuits 4 and 5. This eliminates the possibility of a signal from the outputs of the display device during normal operation of the switch, which is formed only in the absence of a locking switch. potential at all inputs of the matching circuit. The indication of disturbances in the switch and the selection of the types of these disturbances is accomplished by alternately removing the potentials from the inputs of the 6th matching circuits 4 and 5 according to the time interval 6 shaper control program. When one or more switch gates are skipped, a signal does not appear to reset the triggers and the triggers to the end of the load current pulse are in unequal states. Owing to this, at the moment of control it is short; After the disappearance of the potential at the input, "b" coincidence circuit 4, the output signal of the skip inclusion indication is generated at the output of this circuit. Valve self-switching is indicated in the same way in case of one or several valves tripping during the period corresponding to the pause of load current when there is no potential at input b of coincidence 5, and the signal from output of element 3 disappears due to the occurrence of unequal status of triggers. In order to avoid false triggering of the self-switching indication channel, when the gates of the gates are switched on, the signal from the output of the coincidence circuit 4 is fed to the inhibitory input "to the coincidence circuit 5. The proposed device can be completely implemented on standard logic elements. The matching schemes can be used, in particular, the elements ORI with the cell "memory. Separating the output signal of the device across the two channels, depending on the type of malfunction of the switch, creates the necessary prerequisites for the rational construction of the protection system of the installation in which this switch is used. The improvement of the technical and economic characteristics of the proposed device in comparison with the known devices is connected with the use of a generalized channel for processing information from individual sensors and depends on the number of controlled channels and the specific type of elements used. The device for protection and control of a multi-channel switch, contains a current sensor in each channel, the outputs of which are connected to one of the inputs of the corresponding trigger with direct inverse Inputs, as well as a matching element, one of the Kotoporo inputs is connected to the first output of the time interval generator , characterized in that, in order to extend the functionality, it is equipped with two AND elements and an additional coincidence element, wherein the second output of the time generator is soy Inonii to one input of the coincidence on the auxiliary element, and the other two inputs of matching elements are connected to the output of one of AND gates having inputs coupled to inverted outputs of flip-flops, the outputs of which straight through the second AND gate connected with others. the trigger inputs. and the output of the matching element is connected to the third input of the additional matching element. Sources of information taken into account during the examination 1. USSR author's certificate No. 340020, cl. H 02 H 7/10. 1968. 2. The author of the USSR USSR number 508854, cl. H 02 H 7/10, 1975 .. Ultrasound control