Thyristor switch protection-based transformer neutral point blocking system and working method thereof

A transformer neutral point and thyristor technology, applied in emergency protection circuit devices, emergency protection circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, can solve problems such as complex structure and incomplete isolation of DC, and achieve Avoid conduction lag, easy-to-understand software programming, and simple installation

Inactive Publication Date: 2012-02-08
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main suppression measures are the reverse compensation method of the neutral point DC flow and the neutral point series resistance method, which have problems such as complex structure and incomplete isolation of DC.

Method used

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  • Thyristor switch protection-based transformer neutral point blocking system and working method thereof
  • Thyristor switch protection-based transformer neutral point blocking system and working method thereof
  • Thyristor switch protection-based transformer neutral point blocking system and working method thereof

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Embodiment

[0045] Embodiment: a kind of transformer neutral point DC blocking system based on thyristor switch protection (see figure 1 ), comprising a transformer with a neutral point, characterized in that it includes a control circuit breaker K, a thyristor solid-state AC switch signal detection module, a signal conditioning module, a remote communication module, a data acquisition card and a drive module; wherein the control circuit breaker The device K is connected between the neutral point of the transformer and the ground; the input terminal of the signal detection module collects high voltage and high current signals of the neutral point of the transformer, and its output terminal is connected to the input terminal of the signal conditioning module; The output end is connected to the input end of the data acquisition card; the output end of the data acquisition card is connected to the input end of the drive module; the output end of the drive module is connected to the thyristor...

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Abstract

The invention relates to a thyristor switch protection-based transformer neutral point blocking system which comprises a control circuit breaker K, a thyristor solid alternating current switch signal detecting module, a signal conditioning module, a remote communication module, a data acquisition card and a drive module. The working method comprises the steps of signal detection, data storage, working state confirmation, condition analysis, switch control and circuit breaker action. The invention has the advantages of being simple in installation of hardware equipment and popular and easy in software programming, overcoming the defect of conducting lag of a mechanical switch, protecting a condenser bank, reducing the loss of a thyristor switch, precisely obtaining a conducting signal in time and improving the reliability of the blocking system.

Description

(1) Technical field: [0001] The invention belongs to the field of power electronics in electric power systems, in particular to a transformer neutral point DC blocking system and working method based on thyristor switch protection. (two) background technology: [0002] When the power system is in normal operation, the neutral point of the transformer needs to be directly grounded in many cases. However, in recent years, a quasi-DC effect geomagnetic induction current generated by the sun's "magnetic storm" enters the transformer through the transformer grounding system, causing the transformer to generate DC bias. Phenomenon. Therefore, how to suppress the DC bias phenomenon under the premise of ensuring the effective grounding of the neutral point of the transformer is one of the technical hotspots concerned now. At present, the main suppression measures are the reverse compensation method of neutral point DC flow and the neutral point series resistance method, which have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H7/04H02H7/16
Inventor 周雪松周志昊马幼捷吴东方田程文
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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