Controlled switching circuits based on non-linear resistive elements

Abstract

Based on the results of the analysis of resistive circuits, a new circuit of an optoelectronic contactless voltage relay is developed in the article and its application in the power supply system is considered. The possibility of controlling the operating modes of various installations for amplifying electrical signals using optothyristors is presented and methods for their inclusion in electrical circuits are given. Optoelectronic contactless voltage relays were tested under laboratory conditions to obtain input-output characteristics and capacitance voltage waveforms. Based on the improvement of the proposed circuit, a circuit of an optoelectronic contactless voltage relay is developed and provides a high degree of reliability. The proposed voltage relay circuit is simulated using the Electronics Workbench and MATLAB R2014a programs, the results of which show that the changes in the shape of the output voltage curve are close to a sinusoid and coincide with the results obtained analytically.

Pole-changing motor for lift installation

“…Development of the pole-changing winding is carried out by simultaneous consideration of the discretely specified spatial functions (DSSF, function of formalized logic) of two ordinary windings [4,9,21].…”

Study of the state of the issue of increasing the quality of electric energy in the power supply systems

“…The short-term dose of flicker during the measurements did not exceed the permissible limits [13,21].…”

“…The installed capacity of the equipment of an average apartment is at least 4.5-5 kW today, although according to the current design standards for the power supply of residential buildings that are not equipped with electric stoves, and in accordance with the agreement between the subscriber with the power supply organization, the permitted installed capacity of electrical consumers for 1 apartment is taken as 3 kW. Exceeding the installed capacity leads to a significant decrease in voltage and a deterioration in the quality of power [4,18,21].…”

“…At the same time, optoelectronic products are significantly superior to electromagnetic analogs in terms of reliability, durability, transient and frequency characteristics. The control of compact and high-speed optoelectronic transformers, switches, relays is confidently carried out using integrated microcircuits of digital technology without special means of electrical matching [14,21].…”

“…To control the state of the power thyristor, a thyristor optocoupler VU is used, and the diode circuit of the optocoupler is connected through resistors R6, R3, R4, R5 to the capacitor plates, which in turn is connected to the network through two series-connected low-power controlled thyristors VS2, VS1. The control signal for the thyristor VS1 is supplied from the network through the series-connected diode VD2 and the resistor R1, for VS2 through the resistor R2 [21,23].…”