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Single-phase combined transformer

A combined transformer and single-phase transformer technology, applied in the field of transformers, can solve problems such as the inability to guarantee the safety and reliable operation of the power grid, and achieve the effects of improved economy and reliability, good economy, and improved backup rate.

Active Publication Date: 2016-03-16
TBEA SHENYANG TRANSFORMER GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of high-voltage and large-capacity transformers in the prior art that there is only one single-phase transformer as a backup, which cannot guarantee the safe and reliable operation of the power grid, the present invention provides a single-phase combined transformer with improved transportation conditions and flexible operation modes. transformer

Method used

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Experimental program
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Embodiment 1

[0024] This embodiment takes a 700MVA, 750kV single-phase combined transformer as an example. The single-phase combined transformer is used in overhead lines and consists of two conventional half-capacity transformers, that is, each transformer is 350MVA, 750kV.

[0025] like figure 1 As shown, in the present invention, each voltage level side of each transformer is provided with isolating switches, that is, the first high-voltage isolating switch 2A, the first medium-voltage isolating switch 2B, the first low-voltage isolating switch 2C and the first transformer in the first transformer. The second high-voltage isolating switch 2A', the second medium-voltage isolating switch 2B', and the second low-voltage isolating switch 2C' in the two transformers. The different voltage levels of each transformer are led out from their respective bushings and then connected to their respective isolating switches, that is, the leading line of the first high-voltage bushing 1A in the first t...

Embodiment 2

[0029] This embodiment takes a 700MVA, 750kV single-phase combined transformer as an example. This single-phase combined transformer is used in overhead lines and consists of two conventional half-capacity single-phase transformers, that is, each transformer is 350MVA, 750kV.

[0030] Each voltage level side of the two half-capacity transformers is connected together with the two-way SF6 isolating switch through the oil-SF6 bushing, so that the different voltage levels of each transformer are drawn out from their respective bushings and connected to their respective switching devices, and the two transformers are connected accordingly. The outgoing wires of the voltage-level switching devices are drawn out through a common set of corresponding voltage-level bushings.

[0031] The switching operation of two half-capacity single-phase transformers is carried out in a sealed switching device filled with SF6 gas. The high, medium and low-voltage outlet bushings of the two half-capa...

Embodiment 3

[0037] In order to reduce the manufacturing cost of the combined transformer, on the basis of Example 2, the isolating switch in the SF6 switching device is canceled, and two half-capacity transformers are used in the SF6 tube mother through the oil-SF6 bushing on each voltage level side. The detachable hard conductor is connected with the outlet bushing, and then led out from the common bushing.

[0038] The outlet bushings on each side are led out through the pipe mother, and the two transformers can be operated independently or in parallel by removing or connecting the hard conductors in the pipe mother. Compared with embodiment 2, the connection between the two transformers is changed to SF6 pipe-female connection, the cost is reduced, and the external dimensions are basically unchanged.

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Abstract

The invention relates to a single-phase combined transformer, which has two conventional half-capacity single-phase transformers, and each voltage level side of each transformer is equipped with an isolating switch. The isolating switches of the two transformers are connected correspondingly through external lines. Each phase of each scheme of the present invention is composed of two transformers, which is more suitable for transportation to places with severe transportation conditions, has improved standby rate, flexible operation mode and good economy.

Description

technical field [0001] The invention relates to a transformer in a power system, in particular to a single-phase combined transformer. Background technique [0002] The high-voltage and large-capacity transformers used in the power system mostly adopt the operation scheme of single-phase transformers in the form of 3+1 (that is, 3 uses and 1 standby), and the existing problems are as follows: [0003] 1. Due to the limitation of transportation conditions, the capacity of the transformer cannot be made too large. In order to meet the transportation conditions, the volume of the transformer is limited, which sacrifices the reliability of the product on the one hand, and on the other hand increases the workload for future on-site installation. Some projects even require building a factory building on site to reassemble the transformer; [0004] 2. Low reliability. There is only one single-phase transformer as a backup, and the backup rate is 33%. Once a multi-phase transformer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F30/10H02J3/38
Inventor 安振赵静王巍符雪鹏
Owner TBEA SHENYANG TRANSFORMER GRP CO LTD