Contactless switching devices using nonlinear circuits

Abstract

Relevance: the article examines the issues of creating a fast-acting and simple device for improving the quality of energy transmitted to the consumer, namely maintaining the sinusoidality and stability of the supply network voltage within acceptable values, while partially reducing the asymmetry of voltage and current in a three-phase power supply system. The parameters and diagrams of the created contactless voltage relays based on nonlinear circuits are given. For the theoretical study of the obtained differential equations of the nonlinear electric circuit, the numerical Euler method and the method of variation of the free Lagrange constants were used. The issues of regulation of windings of a booster transformer using nonlinear circuits studied in the article are considered. A circuit solution is given for a device that improves the quality of electrical energy, its characteristics of changing the “input-output” voltage, and the shape of the experimental curves of changing the voltage of a booster voltage stabilizer.

Aim: the purpose of this paper is to create a reliable, fast and simple circuit for efficient operation of a step-up transformer while improving the quality of electrical energy transmitted to the consumer. Maintaining the sinusoidality and stability of the supply network voltage within the permissible values, with a partial reduction in the asymmetry of voltage and current in a three-phase supply network will reduce voltage and power losses in 6-10; 0.4 kV networks.

Methods: in this paper, the numerical Euler method and the method of variation of free Lagrange constants are used for the theoretical analysis of the obtained differential equations of nonlinear resistive circuits.

Results: serial production of a step-up transformer in the control system, which uses contactless voltage relays, allows them to be used during the reconstruction of networks with a voltage of 6-10, 0.4 kV, including them on the TP buses or line cuts, which allows for efficient and fast (0.01 sec) automatic regulation of the voltage value at electricity consumers. This type of connection of booster transformers is cheaper than a complete reconstruction of the above networks.