Transformer capable of increasing impedance

A technology of transformers and main transformers, applied in the field of transformers, can solve problems such as large capacity, unusable system disassembly, and high cost

CN106057452AActive Publication Date: 2016-10-26孙崇山
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-10-26

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Abstract

The invention provides a transformer capable of increasing impedance. The transformer comprises a main transformer part, an in-series transformer part, a switch and an electric reactor, wherein the electric reactor and the switch are taken as an impedance regulator; when the transformer needs the small impedance, the switch is flipped down, and the electric reactor is disconnected; when the transformer needs the large impedance, the switch is flipped up, the electric reactor is in an in-series connection with the transformer, and the impedance of the transformer increases; and if the electric reactor is controllable, the impedance of the transformer can be adjusted at will. The design will become a revolutionary change in high-voltage and ultra-high voltage power transmission systems. The transformer has the advantages that system safety is greatly enhanced, and system cost is reduced; and current limiting, current stabilization, filtering, damping and the like of the system will become controllable. The transformer can be applied to high-voltage, extra high-voltage and ultrahigh-voltage AC and DC power transmission as well as other electric power systems in need of the current limiting, current stabilization, filtering and damping.
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Description

technical field

[0001] The invention is a transformer, which is applied in resistive, resistive-inductive and resistive-capacitive power systems. The scope of application covers such as industrial and agricultural production, scientific experiments, power transmission and various power systems. Background technique

[0002] In order to ensure the reliability of system operation and limit its short-circuit current, an effective measure is to increase the short-circuit impedance of the transformer. This is why many developed countries in the world have already tended to adopt high-impedance transformers.

[0003] The power system with improved transformer impedance has the following characteristics: (1) When a short-circuit accident occurs in the power grid, the short-circuit current passing through the high-impedance transformer and other power equipment is small, and the corresponding short-circuit electromagnetic force and current thermal effect will also be reduced. This...

Examples

example

[0077] Example: SSFZ—50000 / 121 power transformer, high voltage 121±8×1.25%, medium voltage 36.75±2×2.5%, low voltage 10.5KV, oil-immersed and air-cooled, other parameters are based on GB / T 6451.

[0078] The original design as Figure ten As shown in VII, this scheme uses copper 14556KG, silicon steel sheet 24640KG, no-load loss: 35KW, load loss: 228KW. And during operation, an air-core reactor needs to be connected in series on the medium-voltage side, and an iron-core reactor should be connected in series on the low-voltage side.

[0079] A transformer that can increase the impedance adopts Figure ten Eight principles. This scheme uses copper 12145KG, silicon steel sheet 25468KG, no-load loss: 34.4KW load loss: 217KW. During operation, a core reactor is connected in series on the voltage regulating side.

[0080] When the copper price is 50 yuan / KG and the silicon steel sheet is 24 yuan / KG, the new scheme saves 7.7% of the cost compared with the original design scheme, ...