A photovoltaic double-split dry-type transformer

Abstract

The invention provides a photovoltaic double-split dry type transformer. The transformer body comprises iron core, the upper winding and the lower winding. The core is a longitudinal seven-step laminated iron core structure. The upper winding and the lower winding are arranged on each phase center pillar. A soft rubber pad is arranged between the upper winding and the lower winding. The soft rubber cushion comprises a first round part, a second circular part and a third round part which are connected with each other. The upper surface and the lower surface of the circular part are respectivelyprovided with an upper groove and a lower groove; the upper winding and the lower winding each comprise a low-voltage coil and a high-voltage coil which are sequentially arranged from inside to outside. The outgoing wires of the two high-voltage coils are connected in parallel, and are electrically connected with a high-voltage control cabinet; The outgoing wires of the two low-voltage coils arerespectively electrically connected with the two inverters; the photovoltaic double-split dry type transformer has the advantages of simple structure and convenient use, realizes that a transformer isconnected with two inverters at the same time. No loop current is generated, the installation space is saved, the cost is reduced, and the safe operation of the power grid is ensured; And the noise generated during the photovoltaic fission is greatly reduced because a new type of sound attenuation and noise reduction structure is adpoted.

Description

technical field [0001] The invention relates to the field of transformers, and more specifically, to a photovoltaic double-split dry-type transformer. Background technique [0002] Photovoltaic power generation and inverter technology are becoming more and more mature. In order to realize the large-scale application of solar power generation, large-scale photovoltaic grid-connected power stations above megawatts have become the main force of development; due to the low output voltage and high harmonic content of inverters, electric energy must pass through The transformer will increase the output voltage of the inverter to 10kV or higher to meet the needs of grid connection; there are two common methods in the existing technology: one is that each inverter is connected with a low-voltage transformer, and then more Two isolation transformers are connected in parallel to the high-voltage power grid through a dedicated step-up transformer; the other is that each inverter is con...

AI Technical Summary

Problems solved by technology

[0002] Photovoltaic power generation and inverter technology are becoming more and more mature. In order to realize the large-scale application of solar power generation, large-scale photovoltaic grid-connected power stations above megawatts have become the main force of development; due to the low output voltage and high harmonic content of inverters, electric energy must pass through The transformer will increase the output voltage of the inverter to 10kV or higher to meet the needs of grid connection; there are two common methods in the existing technology: one is that each inverter is connected with a low-voltage transformer, and then more Two isolation transformers are connected in parallel to the high-voltage power grid through a dedicated step-up transformer; the other is that each inverter is connected to the high-voltage power grid with a step-up transformer with isolation function; in this way, the number of transformers used is increased, accounting for The land area has also doubled, and the cost of related power distribution and other facilities has also increased accordingly; and the existing photovoltaic double-split transformer performs two sets of photovoltaic split work at the same time, causing the transformer to vibrate violently and generate a lot of noise, which affects the surrounding areas. surroundings

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