Lightning protection antiinterference capactive transformer

Abstract

Structure of transformer utilized in power distribution, rectification and power supply for electron devices is as follows. Winding in core limb in each phase at one voltage side of the transformer, or winding in core limb in each phase at different voltage sides is composed of foil type dual lap winding that is two concentric windings are wound by two sets of metal foils insulated each other. Each winding in two concentric windings is cascaded to one of two concentric windings in core limbs in another phase at the same voltage side. Moreover, the said winding cam be made through connecting foil type dual lap winding with single lamp winding, which is a concentric winding wound by insulated conductor. Advantages are: windings of the transformer possess large parallel capacitance capacity so as to able to reduce reactive power compensation equipment in power network, providing functions of lightning protection, anti interference and raising sensitivity of short circuit protection.

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

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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