SU1621119A1 - Light-signal safety device - Google Patents

Abstract

The invention relates to electrical engineering and can be used to visually and automatically monitor the health of a three-phase network and control phase rotation. The purpose of the invention is the extension of functionality by the light diagnostics of the network state. The goal is achieved by introducing into the device the series-connected element OR 10 and the counter-divider 11, the first 12, the second 13 and the third 14 D-flip-flops and three LEDs 15, 16 and 17. Signals from the outputs of the threshold elements 1, 2 and 3 are fed to the inputs of the element OR 10, as well as the main inputs of D-flip-flops 12, 13 and 14. Clock inputs of which receive signals from the output of counter-divider 11. Since the output pulses of the counter-divider 11 alternate in time with the output pulses of the threshold elements 1, 2 and 3, then alternate switching occurs. chenie D-flip-flops 12, 13 and 14 and thereby alternate lighting of the LEDs 15, 16 and 17. When changing the alternating mains phase change occurs interleaving incorporating LEDs. When one or two phases of the network disappear, the corresponding diodes do not light up. 2 Il. (Ls

Description

The invention relates to electrical engineering and can be used to visually and automatically monitor the health of a three-phase network and phase rotation.

The aim of the invention is to extend the functionality by light-diagnosing the state of the network.

1 shows a functional diagram of the device; Figure 2 shows signal timing charts explaining its operation.

The device contains the first 1. second 2 and third 3 threshold elements, the first RS-flip-flop 4, connected S-input to the output of the threshold element 1, the element And 5,

connected by one input to the output of RS-flip-flop 4, and another input to the output of threshold element 2, the second RS-flip-flop b connected by S-input to the output of element And 5, and R-input to the output of threshold element 3. a differentiator connected by input to the output of the RS flip-flop 6, and the output to the input of the element 8 time delay, the output of which is connected to the input of the executive body 9, the element IL AND 10 connected by the output to the input of the counter-divider 11 connected by the output to the clock inputs of the first 12, second 13 and third 14 D-triggers, the main inputs of which, as well as The inputs of the element OR 10 are connected to the outputs.

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threshold elements 1,2 and 3, and seiodiodes 15, 16 and 17.

The combination of elements 4-9 forms a security block, and elements 10-17 form a light signaling unit of the network state.

The device works as follows.

If there is voltage at the inputs of the threshold elements 1, 2 and 3, short pulses 18, 19 and 20 are produced at their outputs, the sequence of which corresponds to the sequence of phases of the input voltage. The impulse from the threshold element 1 is fed to the S input of the RS flip-flop 4, transferring its output to the one state, which is memorized. Potential 1 from the output of the trigger 4 is fed to one input of the element And 5, and the pulse from the threshold element 2 is fed to its second input. If there is 1 at one input at the output of the element And 5, a pulse is generated that converts the RS-flip-flop b to the on state, with the result that the output of flip-flop b appears 1, which goes to the input of the differentiator 7. The pulse from the threshold item 3 enters on the R-inputs of the triggers 4 and 6, transfer them to the disabled (zero) state. When the next pulse from phase A appears, the switching process of the flip-flops repeats, and at the output of flip-flop 6 a sequence of pulses is generated which, having passed through the differentiator 7, constantly keeps the time-delay element 8 in the activated state.

If the sequence of phases is interrupted, or one or two phases are lost, the switching process of the triggers is disrupted and the output of trigger b is set to zero or one state. In this case, at the output of the differentiator 7, there is a zero potential. This condition corresponds to the occurrence of a malfunction. Counting the given time delay, element 8 generates output O, which leads to the actuation of the executive body 9.

The light alarm unit operates as follows.

The pulses from the threshold elements 1, 2 and 3 are fed to the inputs of the element OR 10 and to the D inputs of the flip-flops 12, 13 and 14. At the output of the element OR 10, a sequence of pulses 21 of 150 Hz frequency is received, which is fed to the input of the counter divider 11. Coefficient counter division is not

must be a multiple of 2 and 3. The pulses from the output of counter 11 are fed to the clock inputs of CD triggers 12, 13 and 14. The trigger that switches on the inputs of which the clock and information pulses from the threshold element coincide, after which the LED connected to it lights up . Since the output pulse of the counter-divider 11 alternately coincides

with pulses from different phases, alternate switching of D-flip-flops (signals 22, 23 and 24) is observed and, as a result, alternating lighting of the LEDs - the effect of a running fire. When changing the phase alternation at the input, the alternation of switching on the LEDs changes. If one or two phases disappear at the input, the LED of the corresponding phase will not illuminate. Thus, the light signaling unit provides an overview of the state of a three-phase network.

Claims (1)

Invention Formula The light-signal safety device containing three threshold elements, the output of the first of which is connected to the S-input of the first RS-flip-flop, connected by the output to one input of the And element, to the other input of which is connected to the output of the second threshold element, the second RS trigger is connected by the S input to the output of the element I, and the R input to the output of the third threshold element connected also to the R-input of the first RS-flip-flop. a differentiator connected by the input to the output of the second RS flip-flop, and an output to the input of the time delay element whose output is connected to the input of the actuator, characterized in that, in order to extend the functionality by light-diagnosing the network state, the element OR, counter is additionally introduced divider, three D-flip-flops and three LEDs, while the outputs of the first, second and third threshold elements are connected to the main inputs of the first, second and third D-flip-flops, as well as the element OR connected to the input-output divider counter, the output of which is connected to the clock inputs of the first, second and third D-flip-flops connected to outputs. Cathodes emitting diodes, anodes of which are coupled and connected to a power supply terminal. Have 7fI D1p-pn ppppppppp Mpppppppppppp Fog.1