SU1584024A1 - Combination device for protection of electrical installation under emergency conditions of operation - Google Patents

Abstract

The invention relates to the field of electrical engineering and is intended to protect against leakage of current to earth and from non-full-phase modes. The aim of the invention is to expand the area of detection of incomplete-phase modes by monitoring the break of the phase conductors of the network. If a phase wire is broken in the supply network, one or more relays 25 are de-energized, which leads to the creation of a thyristor control circuit 20, the latter opens and current flows through the signal lamp 19. As a result, the control circuits of the magnetic starter 1 are blocked and power from the electrical installation is removed. A lamp 19 glows for mains damage. 2 Il.

Description

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FIG. 2

Claims (1)

55 The claims A combined device to protect the electrical installation from damage in emergency operation, containing 7 1584024 connected to the disconnecting block contact of the switching device. isolation preliminary control unit, the output thyristor of which is connected via a red light to the output diagonal of the rectifier iost, shunted by a capacitor and a diode connected in series, the common point of which is through the massacre (mountains connected to the Earth terminal, the input diagonal of the bridge is connected through (isolation transformer with terminals for connecting to the network to the switching device and with a ferroresonant voltage stabilizer for controlling the switching device, and to the control elec The output of the sensing unit for detecting an out-of-phase mode, made in the form of a three-phase asymmetry with capacitors in its beams connected to the terminals for connecting to the working windings of the protected electrical installation, is connected to the output windings of the protected electrical installation through the first regulating resistor, the cathode of the output thyristor is connected in turn to a diode with a terminal mine, for connecting to a common point of the working windings of the protected electrical installation, a second signal lamp, characterized in that, in order to expand the detection zone of incomplete about the mode by monitoring the breakage of the phase conductors of the network, it is equipped with an additional thyristor connected in series with the second signal lamp and connected to the output diagonal of the rectifier bridge, and three relays, the windings of which are included in each beam of the specified asymmetry, and the disconnecting contacts of the three relays are connected between in parallel and connected in series to the parallel-connected closing contacts of the indicated relays, · connected through the newly introduced delay element and the second adjustment first resistor in the thyristor control circuit further coupled to the plus rectifier bridge, the winding of said relay are interconnected wye or sequentially with capacitors phase asymmetry. Compiled by L. Vaskova Editor 0.Golovach Tehred M. Khodanich Corrector 0. Kravtsova Order 2260 Circulation 477 Subscription VNIIIPI State 113035, Committee for Inventions and Discoveries under the USSR SCST Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and Publishing Plant Patent, Uzhgorod, st. Gagarina, 101