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A DC Bias Current Suppression Device for Transformer

A current suppression device, a technology of DC bias magnetization, applied in the field of power grid, can solve the problems of affecting the zero-sequence protection setting, unable to completely eliminate the influence of DC bias current, and the influence of zero-sequence parameters, etc., achieving less capital investment, simple structure, and volume. very effective

Active Publication Date: 2018-09-18
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the neutral point access impedance will affect the zero-sequence parameters of the system, thereby affecting the setting of the zero-sequence protection, and the influence of the DC bias current on the transformer cannot be completely eliminated

Method used

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  • A DC Bias Current Suppression Device for Transformer
  • A DC Bias Current Suppression Device for Transformer
  • A DC Bias Current Suppression Device for Transformer

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] see figure 1 , is a structural schematic diagram of an embodiment of a DC bias current suppressing device for a transformer provided by the present invention. Such as figure 1 As shown, the DC bias current suppression device includes: a neutral point access port 101 , a ground port 102 , a positive temperature coefficient thermistor 103 , a capacitor 104 and a controllable gap element 105 .

[0027] The positive temperature coefficient thermistor 103 is us...

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Abstract

The invention discloses a suppression device for DC biasing current of a transformer. The suppression device comprises a neutral point access port, a ground port, a positive temperature coefficient thermistor, a capacitor and a controlled clearance element, wherein the positive temperature coefficient thermistor is used for suppressing the DC biasing current when the DC earth current is increased; the capacitor is used for providing an access for a non-DC current component of a neutral point of the transformer when the positive temperature coefficient thermistor suppresses the DC biasing current, wherein the positive temperature coefficient thermistor is connected between the neutral point access port and the ground port; the capacitor is connected between the neutral point access port and the ground port; and the controlled clearance element is connected between the neutral point access port and the ground port. By adopting the embodiment of the invention, the influence of the DC biasing current on the transformer can be eliminated without affecting line protection of a power grid.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a DC bias current suppressing device for a transformer. Background technique [0002] In recent years, with the rapid economic development and the increase in energy demand, long-distance and large-capacity DC transmission projects have developed rapidly. DC links in AC systems often need to be switched between unipolar earth return and bipolar balanced operation. When the single pole operates with the earth as the loop, the huge DC current forms the loop with the earth, which will form a potential difference between the AC substations, and the DC current will flow through the transformer winding through the center point of the transformer and the transmission line, causing the transformer outlet magnetic bias phenomenon . The direct grounding of the neutral point transformer in the AC grid works in the saturation area of ​​the excitation area, which will cause severe vibra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H9/06
Inventor 李锐海孟晓波邹林廖永力王颂张巍吴新桥张贵峰陈晓朱烨龚博金虎周宗国
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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