Lightning protection antiinterference capactive transformer

A technology for transformers and three-phase transformers, applied in the field of transformers, can solve problems such as adverse effects of switchgear and protection device setting, reduce transformer impedance voltage drop, adverse lightning strike and interference prevention, etc., so as to eliminate additional losses, reduce quantity and The effect of investment and improved sensitivity

CN1494094AInactive Publication Date: 2004-05-05悉瑞绿色电气(苏州)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2004-05-05
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0046] First, the low-voltage winding of the transformer is described.

[0047] Shown in Fig. 1 is the structure of the winding of the present invention. In the present invention, one layer of insulating layer 3, one layer of metal foil 2, another layer of insulating layer 3, and another layer of metal foil 2 are separated from each other and stacked, and wound on the inner insulating cylinder 1 (the inner insulating cylinder 1 is also may be formed by the first insulating layer 3 itself). After the winding is completed, an outer insulating layer 3 is wrapped on the surface of the outer metal foil 2 of the winding. (The metal foil 2 can also be placed in the innermost layer, and the insulating layer 3 of the outer layer after winding naturally forms the outer insulating layer of the winding, and then is properly coated with a reinforced insulating mate...