Large-capacity wind field box transformer structure

Abstract

The invention discloses a large-capacity wind field box transformer structure. The large-capacity wind field box transformer structure includes a box transformer shell, a transformer, a gas filling switch assembly, a high voltage cable, a transformer outlet bushing and a current transformer, wherein the gas filling switch assembly, the high voltage cable, the transformer outlet bushing and the current transformer are disposed in the box transformer shell, the transformer is located outside the box transformer shell, and the current transformer, the gas filling switch assembly and the high voltage cable are electrically connected in sequence. The large-capacity wind field box transformer structure is advantaged in that a charging switch assembly including a vacuum circuit breaker and a three-station isolated grounding switch is utilized, the space can be saved, the floor space is reduced by 25-30% compared with a split vacuum circuit breaker+an upper isolation switch+a lower grounding switch, the land acquisition and civil construction area is saved, and transport and hoisting are facilitated; an inflatable switch assembly adopts SF6 insulation, high reliability and low operating cost of inflatable products are integrated; through integrated mechanical interlock design between the vacuum circuit breaker and the isolated grounding three-station switch, misuse can be effectively prevented.

Description

Technical field [0001] The invention relates to a box-type transformer, in particular to a box-type transformer structure of a large-capacity wind farm. Background technique [0002] As the capacity of the fan increases, the capacity of the box-type substation also increases. The changes in the requirements for the box-type substation are reflected in the following aspects: 1. Structural changes. In the 1.5-2.0MW era, the main structure of the box-type substation is beautiful. In the 2.5~5MW era, the structural form of the box substation was adjusted to be based on the structure of China Substation; 2. The high-voltage side switch changes, from the load switch + fuse scheme to the circuit breaker scheme, and the interlock design and structure are complicated; 3. After the capacity is increased, the volume of the entire box transformer becomes huge, transportation and hoisting are difficult, and the cost increases; 4. With the increase of the transformer capacity, the transformer ...

AI Technical Summary

Problems solved by technology

[0005] 2. The split vacuum circuit breaker + upper isolating switch + lower grounding switch is also air-insulated, with an overall size of about 5550 (length) × 2725 (width) × 2500 (height) mm. There are many types of main switches to choose from. But the volume is very large, it is very inconvenient to assemble and transport, and the mechanical interlock involves 3 independent components, the operation is cumbersome and the reliability is not high;

[0006] 3. Handcart-type vacuum circuit breaker + lower grounding switch, air-insulated, with an overall size of about 5400 (length) × 2550 (width) × 3000 (height) mm, the main switch can be pulled out for maintenance, and it is more convenient to replace under extreme accidents , the volume is also very large, it is inconvenient to assemble and transport, the positioning strength of the handcart circuit breaker is not enough, it needs to be packaged and transported separately, and the area of ​​the site foundation must be large enough to carry out the operation of the handcart;

[0007] 4. Fully insulated inflatable switchgear (vacuum circuit breaker, lower isolation \ grounding three-station), SF6 gas insulation, the overall size is about 3800 (length) × 2550 (width) × 2900 (height) mm, low equipment failure rate, The operating cost is greatly reduced, the safety is good and the volume is small, which can effectively reduce the shell material and transportation costs, but its initial cost is high, including equipment purchase fees and installation and test fees. Currently, there are very few manufacturers that can produce 35kV inflatable cabinets. Imported The brand accounts for a large proportion, the price of spare parts for inflatable cabinets is not low, the professional requirements for installation and maintenance are higher, and it is easy to leave potential safety hazards

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