SU1410135A1 - Apparatus for inspecting operability of n cutouts - Google Patents

Abstract

The invention relates to electrical engineering and can be used to monitor the operability of fuses in DC and AC circuits in a wide voltage range under any type of load. The purpose of the invention is to increase reliability. This is achieved by the fact that a device containing capacitors 2, 3, a source of high-frequency alternating voltage 4, a detector-amplifying unit 6, a signal element 12, n + 1 high-frequency chokes, n detector-amplifying units 6, are introduced; The choke 10 is connected between the terminals of the high-frequency alternating voltage source, and the remaining n chokes 11 are connected to the second output terminal of the high-frequency alternating voltage source and each to the input of the corresponding detector / amplifying unit. With good high-frequency fuses from a high-frequency alternating current source 4 through high-frequency chokes 11, capacitors 2, fuses 1 and capacitors 3 are closed on a common bus 5. If one or more fuses are faulty, then the high frequency current enters The bases of the transistors 7, which are part of the detector-amplifier units 6 corresponding to the defective fuses. The transistors 7 turn on and create a current circuit of the corresponding positions of the signal element 12. 2 Il. § L

Description

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The invention relates to electrical engineering and can be used to monitor the health of fuses in DC and AC circuits in a wide range of voltages for any kind of load.

The purpose of the invention is to increase reliability and reduce power consumption.

i FIG. 1 shows a diagram of the device; in fig. 2 is a diagram of the power supply of this device from a three-phase AC network.

The device (Fig. 1) contains in the circuit of each monitored fuse I the first 2 and second 3 capacitors connected by the first terminals to the fuse 1 of the source 4 of high-frequency alternating voltage, the first output terminal of which is connected to the common bus 5, p detectors amplifying blocks 6, made, for example, in the form of a transistor 7, the basic transition of which is shunted by an oppositely connected diode 8, and a capacitor 9 is connected between the collector and the emitter, a high-frequency choke 10 connected between the output terminals of the source 4 high-frequency alternating voltage, n high-frequency chokes 11, connected to the second output terminal of the high-frequency alternating voltage source 4 and each to the output of the corresponding detector-amplifier unit 6, to the output of which is connected the corresponding position input signal element 12, with this the second terminals of the first capacitors 2 are connected to the inputs of the corresponding detector-amplifying units 6, and the second terminals of the second capacitors 3 are connected to the common busbar 5.

The power supply of the device (Fig. 2) contains three valves 13 connected to the three phases of an alternating voltage and connected by other leads to each other, three resistors 14 also connected to the three phases of the alternating voltage and connected by other leads to each other. the connection of resistors 14 forms a common bus 5, a limiting resistor 15 connected by one output to the common point of connection of valves 13 and the other to a signal element 12, a parametric stabilizer 16 connected between the common connection point of valves 1 3 and a common bus 5, the output of which is connected to the source 4 of high-frequency alternating voltage.

The operation of the device for monitoring the fuses is as follows.

With good fuses, 1 high frequency currents from source 4 of high-frequency alternating voltage through you

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low-frequency chokes 11, capacitors 2, fuses 1 and capacitors 3 are shorted to common bus 5. The resistance of the circuit from capacitors 2, 3 and fuse 1 is chosen so that the voltage drop caused by high-frequency current, the value of which is determined by the resistance of high-frequency throttles 11, would not cause the detector-amplifier units 6 to be unlocked. With the detector-amplifier units 6 locked, the signal element 12 is not activated. If one or more fuses 1 are faulty, the high frequency current enters the bases of transistors 7, which are part of the detector-amplifying units 6 corresponding to the faulty fuses. Transistors 7 turn on and create a circuit of the corresponding positions of the signal element 12. The latter highlights the numbers corresponding to the numbers of faulty fuses. The device works both in the mode of regular functioning of the monitored circuits, and after their switching off. At the same time, for the mains frequency, the capacitors 2 and 3 represent such resistance that the current of the mains frequency passing through them causes a voltage drop across the high-frequency droplets x 10 and 11, which is not enough to turn on the detector-amplifying units 6.

The introduction of high frequency chokes makes it possible to precisely distribute the current of the high frequency alternating voltage source 4 between the monitored circuits. Since the current required for triggering the detector-amplifying unit 6 is tens of microamps (in the case of a glow discharge signal element), when monitoring tens of fuses, a source of high-frequency alternating voltage with a current of 1-2 mA is necessary. This means that the source of high-frequency alternating voltage can be made according to almost any oscillator circuit: in the form of a symmetric multivibrator with a closed output, on an operational amplifier, on tunnel diodes with inductance. At this mode, the high-frequency alternating voltage source is stationary, with a constant load, without transients, which leads to an additional increase in the reliability of the entire device.

A small current consumption by the monitoring device leads to a decrease in the size and weight of the equipment, since the dimensions and weight of the device power source are drastically reduced. There is a possibility of supplying the control device without the use of a power transformer (Fig. 2).

As a p-position signal element, digital glow-glow indicators or vacuum luminescent indicators can be used. If necessary, a single-element signal element can be connected to each output of the detector-amplifying unit: a glow lamp, a LED, a neon lamp, etc. With a very large number of monitored fuses, several signal elements are used, with between the signal elements. The outputs and outputs of the detector-amplifying units may be included in the encoder (its device, its device). The use of the p-position signal element reduces the area of the front panels of the switchgear, where the fuses are installed. 15

The noise immunity of the monitoring device is also ensured by the inertia of the signal element, since the human eye does not see any random changes in luminance when exposed to interference. Due to this capacitor 9 in the detector-amplifying unit may be missing.

When a fuse fails, the signal element displays the number of the blown fuse, and when a new fuse is installed in its place, this information disappears. The device does not require additional manipulations when changing fuses.

Use of control device

custodians who have a large number of peredomednyh bonds between them.

Claims (1)

Invention Formula A device for monitoring the operability of p fuses, containing respectively n first and second capacitors, the first terminals of which are connected respectively to the first and second terminals d, 1 of the fuse connections, the detector-amplifying unit, the source of high-frequency alternating voltage, the first output terminal of which is connected to common tine, p-position signal element, characterized in that, in order to increase reliability and reduce power consumption, p-1 detector-amplifying units are introduced into it , n + 1 high-frequency chokes, the first choke is connected between the output terminals of the high-frequency alternating voltage source, the remaining n chokes are connected to the second output terminal of the high-frequency alternating voltage source, the second output of each of the chokes is connected to the input of the corresponding detector-amplifiers unit, to the first output of each of which is connected the corresponding input of the signal element, made p-position, more efficiently in distribution devices - "conclusions Suitable detector-amplifier bloroystvah multiphase systems bolschoy-ing attached to a common bus, the second By the number of fuses, the load co-outputs of the first n capacitors are connected second, serve as motors or rectifiers for the inputs to the corresponding n detector-usitransformer input, as well as for the device blocks, the second terminals of the second, The direct current properties protected by pre-capacitors are connected to the common bus. five five 0 custodians who have a large number of peredomednyh bonds between them. Invention Formula A device for monitoring the operability of p fuses, containing respectively n first and second capacitors, the first terminals of which are connected respectively to the first and second terminals d, 1 of the fuse connections, the detector-amplifying unit, the source of high-frequency alternating voltage, the first output terminal of which is connected to common tine, p-position signal element, characterized in that, in order to increase reliability and reduce power consumption, p-1 detector-amplifying units are introduced into it , n + 1 high-frequency chokes, the first choke is connected between the output terminals of the high-frequency alternating voltage source, the remaining n chokes are connected to the second output terminal of the high-frequency alternating voltage source, the second output of each of the chokes is connected to the input of the corresponding detector-amplifiers unit, to the first output of each of which is connected the corresponding input of the signal element, made n-position, about