SU1163389A1 - Device for checking serviceability of n fuses - Google Patents

Abstract

A DEVICE FOR CONTROL OF CORRECTION OF FUSES, containing in the circuit of each fuse the first transformer, the primary winding of which is connected to the code of the alternating voltage source, the second transformer, the primary winding of which shunts the fuse, and the signal element that is connected to the secondary winding circuit is different in order to enable the control of fuses in high-voltage DC and AC circuits, both directly in the normal operation mode After switching it off, the logic circuit And, 4p capacitors, clock generator, binary counter, first and second switches, threshold detection transducer, decoder, and the first transformer secondary winding fuse each are inserted into it the output of the secondary windings of the first transformers and the primary windings are second; to the transformer 1 / mator is connected to the output of the fuse via a capacitor, the primary windings of the first transformers are directly connected They are located at the analog outputs of the first switch, and the secondary windings of the second transformers are connected to the analog inputs of the second switch, the analog output of which is connected to a threshold detector, a output connected to the first inputs of logic elements I, to the outputs of which signal elements are connected, and to the second inputs - the corresponding outputs of the decoder, the control inputs H of which are connected to the corresponding G control inputs of the first and second switches and connected to the gateway 1 An ohm counter whose input O) is connected to the device QQ through a clock generator, and the jQ input of the zero setting is connected to it QQ directly, while the alternating voltage source g is in the form of a high frequency generator whose output is connected to an analog the input of the first switch.

Description

The invention relates to electrical engineering and is intended to monitor the operability of fuses in DC and AC circuits.

The purpose of the invention is to enable the control of fuses in high-voltage DC and AC circuits, both directly in the normal operation mode of the monitored circuit and after it is turned off.

The drawing shows a diagram of the device for monitoring the health of n fuses.

The device contains in the circuit of each fuse 1 the first transformer 2, the primary winding 2-1 of which is connected to the output of the alternating voltage source 3, the second transformer 4, the primary winding 4-1 of which shunts the fuse 1, and into the secondary winding 4 -2 signal element 5 is turned on. Parameters N 6, 4 gy of capacitors 7, clock generator 8, binary 1 1st counter 9, first 10 and second 11 switches, threshold detection transducer 12, decoder 13 are inserted into the device. In each circuit secondary fuse The coil 2-2 of the first transformer 2 shunts the fuse 1, each output of the secondary windings 2-2 of nepmix transformers 2 and the primary winding 4-1 of the second transformer 4 is connected to the output of the fuse 1 via separation capacitor 7. The primary windings 2-1 of the first transformers 2 directly connected to the analog outputs 14-1, ..., 14-p of the first commutator 10, and the secondary windings 4-2 of the second transformer 2 - to the analog inputs 15-1, ..., 15-11 of the second switch 11, to the analog output 11-1 which is connected threshold detection a converter 12 containing a peak filter 16 and a rectifier amplifier 17. The output of the threshold detector converter 12 is connected to the first inputs of logic elements 6, to the outputs of which the signaling elements 5 are connected, and to the second inputs to the corresponding outputs 18-1, ... , 18-p decoder 13, the control unit whose inputs 13-1 are connected to the corresponding control inputs 10-2 and 11-2 of the first 10 and second 11 switches and are connected

to outputs 9-2 of binary counter 9, the control input 9-1 of which is connected. not with input 19 devices

the clock generator 8, and the input 9-0 of the zero setting is connected to the input 19 directly. The alternating voltage source 3 is made in the form of a high-frequency generator, the output of which is connected to the analog input 10-1 of the first switch 10. Power is supplied to the signal elements 5 through the breaking contact of the button 20.

The device works as follows.

When power is supplied to the device, a high-frequency alternating voltage generator 3 is started, the output signal of which is fed to the analog input 10-1 of switch 10. By the leading edge of the supply voltage coming from input 19, binary counter 9 is set to zero state, after which the clock pulse generator 8, the input to the input 9-1. The signals from the outputs of the binary counter 9, the post to the control inputs 10-2, 11-2, 13-1 of the switches 10, 11 n of the decoder 13 provide alternate connection of the output of the high-frequency generator 3 to the primary windings -2-1 of the first transformers 2, and the secondary windings 4-2 of the corresponding second transformers 4 to the input of the threshold detection converter 12, as well as forming on the corresponding code 18-1, ..., 18-n the decoder 13 values of the signal Log.1, If any fuse fails after connection of the primary winding The first transformer of this fuse to the output of the high-frequency generator 3 through the switch 10 in the secondary winding of the second transformer of this fuse is induced by a high-frequency voltage input to the input of the threshold detection converter 12, the signal from the output of which is fed to the first inputs of the And 6 elements. Simultaneously at one of the outputs 18-1, ..., 18-h of the decoder 13, corresponding to the number of the blown fuse, the value of the signal Log.1 is formed, which ensures the operation of the corresponding logic Skogen AND gate 6 and the signaling element 5, the number of the burnt ukazshayuschegs

3

fuse After replacing the fuse, the triggered signal element 5 is reset to the initial state by pressing the button 20. The capacitors 7 provide galvanic isolation of the controlled circuit and the control device circuits, since the industrial voltage practically does not pass through these capacitors, while the control voltage high frequency passes through the HHXj almost unabated.

The invention provides the ability to simultaneously control large 894

Number of fuses installed in both direct and alternating current circuits, both directly in the normal mode of controlled operation, and after it is turned off. The use of high-frequency control voltage allows reducing the weight and dimensions of the device, since it is possible to manufacture transformers on ferrite cores. The galvanic isolation of the controlled circuits and the control device increases the safety of the device operation in high-voltage circuits.

3f-O

Claims (1)

DEVICE FOR CONTROL OF FUNCTION η FUSES, containing in the circuit of each fuse the first transformer, the primary winding of which is connected to the output of the AC voltage source, the second transformer, the primary winding of which bypasses the fuse, and a signal element is included in the secondary winding circuit, characterized in that, for the purpose of providing the ability to control l fuses in high-voltage circuits of direct and alternating current, as directly in the mode of normal functioning of the controlled voltage After turning it off, both logic inputs And, 4 liters of capacitors, a clock generator, a binary counter, the first and second switches, a threshold detection converter, a decoder are inserted into it, and in the circuit of each fuse the secondary winding of the first transformer shunts the fuse, each terminal of the secondary windings of the first transformers and the primary windings of the second transformers is connected to the fuse terminal through a capacitor, the primary windings of the first transformers are directly connected to an analog the first outputs of the first switch, and the secondary windings of the second transformers to the analog inputs of the second switch, the analog output of which is connected to a threshold detect km converter, connected by the output to the first inputs of the AND logic elements, to the outputs of which the signal elements are connected, and to the second inputs - the corresponding outputs of the decoder, the control inputs of which are connected to the corresponding control inputs of the first and second switches and are connected to the outputs of the binary counter, which controls od which is connected to the input device via a clock generator, and the zero-setting input connected to it directly, with the ac voltage source is in 05 \ with co 00 CO as a high-frequency generator, the output of which is connected to the analog input of the first switch.