Capacitive transformer preventing thunderstruck and interference

Abstract

A capacitive transformer for preventing thunder stroke and interference to electric appliance features that its each winding is made up of two overlapped metal foils with electric insulation between them and wound concentrically to form a compound winding, and each of two concentric windings is serially connected with one singel foil winding of another concentric winding at the same voltage side.

Description

technical field [0001] The invention belongs to transformers for power distribution, rectification and electronic equipment power supply. Background technique [0002] At present, the connection of three-phase transformer windings is nothing more than Y (including Y 0 ) connection, Δ connection and Z (including Z 0 ) in three ways. [0003] For the three-phase double-coil distribution transformer that supplies power to users in the high-voltage power grid, when the secondary low-voltage power grid adopts a three-phase four-wire (TN-S or TN-C-S) system for power distribution, the commonly used wiring methods are Y / Y 0 and Δ / Y 0 Two kinds. where Y / Y 0 The transformer of the connection mode is relatively low in manufacturing cost. But the zero-sequence impedance is larger. When a single-phase ground short circuit occurs on the secondary side, the short circuit current is small, which reduces the sensitivity of the short circuit protection device. At the same time, when ...

AI Technical Summary

Problems solved by technology

[0011] (2). The distribution transformer itself is a power supply device, which requires high reliability

The series capacitor can only amplify and conduct lightning waves and interference waves, which is not conducive to lightning protection and interference prevention

At the same time, the series capacitor reduces the impedance voltage drop of the transformer, which will increase the short-circuit current and adversely affect the setting of switchgear and protection devices.

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