Power transformer DC magnetic bias state detection method based on noise method

A power transformer and DC bias technology, applied in the field of power transformers, can solve problems such as increased operating noise, increased magnetic flux leakage, and DC transmission system work

Inactive Publication Date: 2015-02-04
POWER GRID TECH RES CENT CHINA SOUTHERN POWER GRID +1
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Problems solved by technology

[0002] Equipment failures in the DC transmission system, routine preventive maintenance, and single-pole commissioning and commissioning at the initial stage of the construction of the converter station often lead to the operation of the DC transmission system in the single-pole ground loop mode or the bipolar unbalanced mode
When the DC current flows into the AC transformer with the neutral point grounded through the ground pole, it will cause DC bias, DC magnetic potential or DC magnetic flux to cause a series of electromagnetic effects of the transformer, including magne

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  • Power transformer DC magnetic bias state detection method based on noise method
  • Power transformer DC magnetic bias state detection method based on noise method
  • Power transformer DC magnetic bias state detection method based on noise method

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Embodiment Construction

[0018] The present invention measures the sound level of the power transformer according to the national standard GB / T1094.10-2003 sound level measuring method under no-load and low-load conditions, and records the noise spectrum of each measuring point. Select several sensitive points at the location, and measure the sound level and noise spectrum of the power transformer under no-load and low-load conditions under DC bias, and compare the sound level and spectrum changes without DC bias, and comprehensively analyze and determine the transformer DC. The bias state, characterized by the increase in sound pressure level and sound power level and the change in the dominant frequency in the frequency spectrum, determines the DC bias state of a power transformer.

[0019] Concrete detection steps of the present invention are:

[0020] 1) According to the national standard GB / T1094.10-2003 sound level measurement method, the sound pressure level, sound power level measurement ...

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Abstract

The invention provides a power transformer DC magnetic bias state detection method based on a noise method. The state detection method comprises transformer noise sound pressure level and sound power level measurement and noise spectrum analysis method. According to the method, magnetic bias condition of the DC invaded into a transformer and the magnetic bias state of the transformer are determined according to the transformer noise sound pressure level and sound power level added values and change of the noise spectrum. The detection method is simple, practical, energy saving and highly-efficient, can be jointly used with other electric performance test methods being combined, can also be used alone, and can carry out detection and analysis on the DC magnetic bias state of the transformer to guarantee the transformer to run safely and reliably in the DC magnetic bias state. The detection method is suitable for three-phase five-column, single-phase three-column and single-phase four-column iron core type transformers, and is not suitable for a three-phase three-column iron core type transformer.

Description

technical field [0001] The invention relates to the technical field of power transformers, in particular to a detection method for a DC bias state of a power transformer based on a noise method. Background technique [0002] Equipment failures in the DC transmission system, routine preventive maintenance, and single-pole commissioning and commissioning in the initial stage of converter station construction often lead to the operation of the DC transmission system in the single-pole ground loop mode or the double-pole unbalanced mode. When the DC current flows into the AC transformer with the neutral point grounded through the ground pole, it will cause DC bias, DC magnetic potential or DC magnetic flux to cause a series of electromagnetic effects of the transformer, including magnetic saturation of the iron core half cycle, loss, temperature rise increase, If the saturation degree of the iron core is high, it may cause the increase of flux leakage to cause local overheating, ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 黄莹黄成李英饶宏邓晶项阳欧强陈洪波
Owner POWER GRID TECH RES CENT CHINA SOUTHERN POWER GRID
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