SU1379833A1 - Device for checking serviceability of "n" fuses - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use in power supply systems with a large number of fuses. The purpose of the invention is to simplify and increase the reliability of the device. When using

Description

equality of controlled fuses 1 high-frequency generator 7 with self-excitation does not generate, key 9, the input connected to the output of the generator 7 is closed, the elements D of the display do not work. If one of the fuses 1 fails, generator 7 connected to this circuit

fuse through switch 5, generates a high-frequency alternating voltage of nonzero amplitude, switch 9 operates, and through second switch 12 supplies power to the corresponding indication element 4, which operates, indicating the number of the defective fuse. 1 il.

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The invention relates to electrical engineering and is intended for use in power supply systems with a large number of fuses.

The purpose of the invention is to simplify and increase the reliability of the device.

The drawing shows a diagram of the proposed device.

A device for monitoring the operability of p fuses 1 contains n transformers 2, n breakout first two-terminal 3, n indication elements 4, first switch 5 with switched channels, first generator 6 clock pulses, second generator 7, binary counter 8 with control account C- the input and the dynamic zeroing R input, the key 9 and the leads used to connect to the power supply 10. The output of the first generator of 6 clock pulses is connected to the C input of the binary counter 8, the output of the bits connected to the control inputs of the first switch 5, all the inputs of the switched channels of which are combined, and

The primary winding of the corresponding transformer 2 is connected to the output of each switched channel. The control inputs of the first 6 and second 7 generators and the input of the switched circuit of the key 9 are connected to the same terminals that serve to be connected to the power supply 10. The first terminal of the secondary winding of each transformer 2 is connected to the first terminal of the corresponding decoupling first two-terminal 3, the second terminal of which serves to connect the first controlled fuse 1 to the first terminal.

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In the device there are n divisive second two-terminal 11 and second switch 12 with n switched channels. The second output of the secondary winding of each transformer 2 is connected to the first output of the corresponding decoupling second two-terminal 11, the second output of which serves to connect to the second output of the corresponding terminal fuse 1. The first 3 and second 11 decoupling two-terminals are each connected as a capacitor connected in series into the secondary circuit, the winding of the transformer 2. The control input of the first generator of 6 clock pulses is connected to the dynamic R-input of zeroing the binary counter 8, the outputs and bits are also connected to the control inputs of the second switch 12. The second generator 7 is made in the form of a high-frequency alternating voltage source with self-excitation and an output connected to the combined inputs of the switching channels of the first switch 5 and to the control input of the switch 9, the output of the switched circuit of which is connected to the combined inputs of the switched channels of the second switch 12, between the output of each switched channel of which and the other output serving to connect to the power source, include n the corresponding element And the display

In the chain of elements 4 of the display included button 13 reset.

The device works as follows.

To control the health of the fuses 1 include a power source 10, the voltage of which is supplied

to generators 6 and 7, to the R input of the counter 8, and to the input of the switching circuit of the key 9,

In the initial state, from the outputs of the binary counter 8 to the control inputs of the switches 5 and 12 a certain combination of logic signals is received, at which the corresponding protection of the body 1 is monitored.

The switch 5 is set in this position when the input is connected to the corresponding output connected to the primary winding of the transformer 2, the High Frequency Generator 7 is connected to the primary winding of the corresponding transformer 2, The secondary winding of the transformer 2 is connected via a capacitor 3 and 11 to the monitored fuse 1, respectively, the switch 12 with this combination of signals of the binary counter 8 is set to the position when its input is connected to the corresponding element 4 of the display rez switch 12.

If the monitored fuse 1 is healthy, it shunts the secondary winding of the transformer 2, while the resistance of the primary winding is negligible. High-frequency oscillator 7 with self-excitation disrupts its oscillations, as self-excitation conditions are violated. Key 9 is closed, and the element 4 of the display does not work. If the monitored fuse 1 is faulty, the primary resistance of the transformer 2 is large and the generator 7 does not disrupt its oscillations. Key 9 opens. The corresponding display element 4 is triggered. In case of failure of other fuses 1, the device works in the same way.

The positive effect created by the invention is to simplify the design of the device and increase its reliability. There are no pulse transformers with multiwinding primary windings in the device, which improves its weight and size characteristics. In good condition of all fuses, the proposed device is not a source of industrial interference due to the absence of high-frequency signals at the output of the second generator.

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Claims (1)

Invention Formula A device for monitoring the health of p fuses, containing p transformers, p switching first two-terminal circuits, p display elements, the first switch with p switched channels, the first generator of clock pulses, the second generator, a binary counter with a control counting C input and a dynamic R input the zeroings, the key and the leads used to connect to the power source, with the output of the first clock generator connected to the C input of the binary counter, the outputs of the bits connected to the control input The first switch, all inputs of the switched channels of which are combined, and the primary winding of the corresponding transformer are connected to the output of each switched channel, the control inputs of the first and second generators and the input of the switched key circuit are connected to the same terminals for connection to the power source, the first output the secondary winding of each transformer is connected to the first terminal of the corresponding isolating first two-terminal circuit, the second terminal of which serves to connect to the first terminal For an appropriate controlled fuse, characterized in that, in order to simplify and increase reliability, the device includes two connecting two bipolar networks and a second switch with n switched channels, the second terminal of the secondary winding of each transformer is connected to the first terminal of the corresponding second bipolar network, the second the output of which serves to connect to the second output of the corresponding monitored fuse, with the first and second connecting two-pole performing us each a capacitor connected in series in the circuit of transformer secondary winding, the control input of the first clock pulse generator is coupled with the dynamic R-reset input of the binary counter, outputs bits connected also to the control inputs of the second switch, the second generator is designed as a high-frequency source 513798336 alternating voltage from the spontaneous inputs of the switched channels of the second singing and exiting is connected to the unified switch, between the output of each the foam inputs of the switched channels of the switched channel of which and the first switch and to the control one, another output for connecting to the key input, the output of the switched power supply circuit is turned on corresponding to which is connected to the combined display element.