SU452811A1 - Device for determining the class of faults in relay structures - Google Patents

Description

one

The invention relates to automation and computing and can be used in control systems.

A device is known that allows to select from a full set of combinations of / elements by elements any subset of combinations formed from one, two, three, and so on. items combined. The known device contains a generator of combinations and a recorder.

However, this device does not allow to distinguish in a subset of combinations, each combination which is formed by two elements of P, combinations that describe faults such as a short circuit of the elementary peppies in relay structures. Such sets of faults are used to build sets of structural control tests.

The proposed device differs from the known one in that it further comprises a binary counter, a trigger, an AND element, threshold elements, a delay element, a Ban element and a key. The input of the generator combinations connected to the input

binary counter through the element And, the second input of which is connected to the output of the binary counter through a trigger, and the outputs of the combination generator, connected via a key to the recorder, are connected via threshold elements with the first input of the Inhibit element, the second input of which through the delay element is connected to the output of the And element, and the output is with the control input of the key.

This allows the device to generate combinations corresponding to a pair of points of the ladder structure. Moreover, each of these points belongs to a different elementary chain of the structure.

The block diagram of the device shown in the drawing.

The binary counter 1 together with the trigger 2 and the logical element I 3 carry out a count of a predetermined number of pulses arriving at the input 4.

The combination generator 5 generates code signals corresponding to all possible combinations of π elements, two each, and P. corresponds to the total number

3

points (connections between contacts), set on the relay structure.

Key 6 controls the input of the recorder 7.

The threshold elements 8 are configured to operate upon the excitation of any two inputs.

The number of threshold elements corresponds to the number of elementary chains in the controlled structure. The number of inputs in each threshold element 8 is determined by the number of points on the elementary chain of the original structure.

The element Ban 9 generates a single signal at the output with zero and single signals, respectively, at its first and second inputs.

The delay element 1O delays the signal for the transition time in the combination generator 5 and the threshold elements 8.

Before the start of operation, the counter 1 is reset, then an addition to the number Spn is entered into it and an initial command is issued, according to which the trigger 2 is transferred to the zero state.

Upon the Start command, pulses start to arrive at the inputs of counter 1 and element 3. The pulses fill counter 1 and simultaneously arrive at the inputs of generator 5 and element 9 of the interdiction through the open element 3. For each pulse arriving at the input of generator 5 at its AND outputs A dbd signal is generated corresponding to one of the combinations.

With p I and the pair of excited outputs corresponds to the next generated combination.

If single signals appear at two inputs of one or several threshold elements 8, which corresponds to a short circuit of two points of one elementary chain of the structure, then a single signal is generated at the output of the corresponding threshold elements

post the first input element At the output of element 9 in this case, a zero signal is generated, and key 6 is not opened.

If the inputs of all threshold elements 8 receive no more than one signal, which corresponds to a short circuit of two points from different elementary chains,

The first input of element 9 will be a zero signal and, therefore, a single signal is generated at its output. The single signal opens the key 6, and the code signal is recorded by the recorder 7.

When counting the number of pulses equal to

P

The number of combinations C n the output of counter 1 forms an overflow pulse, which translates trigger 2 into a single state. In this case, the And 3 element is closed, the device stops working, and on the recorder 7 a set of code signals corresponding to a multitude of faults between two points of different elementary chains of the relay structure is fixed.

The subject of the invention 30 A device for determining a class of faults in relay structures, comprising a combination generator and a recorder, which is obtained in that, in order to improve functionality, it creates a binary counter, trigger, And delay, Prohibit, threshold elements and a key; moreover, the input of the generator with; the statements is connected to the input of the binary counter via the And element, another input 40 of which is connected to the output of the binary counter via a trigger, and the outputs of the combination generator connected through the key to the recorder are connected through the threshold elements to the first input of the Za45 pret element, the second the input of which through the delay element is connected to the output of the element I and the output to the control input of the key.

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