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The Suppression for DC Bias on Transformer Neutral Point

Author: LiuZongWei
Tutor: BaiBaoDong
School: Shenyang University of Technology
Course: Motor and electrical
Keywords: Transformer DC magnetic bias DC potential compensation Compensate for power
CLC: TM406
Type: Master's thesis
Year: 2010
Downloads: 203
Quote: 1
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Abstract


With the development of electric power of China 's \transmission equipment produce certain adverse effects, such as transformer neutral point of the DC magnetic bias phenomenon . This phenomenon adversely affect the performance of the rms value of the excitation current , the higher harmonic components , and the corresponding increase in loss , a core height of saturation will cause the increase in the leakage flux , and consequent local overheating , insulation aging problem. This research mainly inhibition caused by the earth DC current DC magnetic bias arising from the earth DC current , there are two ways , one is the earth magnetic storm caused power grid in the low-frequency circulation ( relative to the 50Hz frequency current than equivalent DC ) , the main east-west grid . Second is the monopole operation , the DC transmission to earth as a running loop . The suppression method corresponds to the earth caused by the DC current DC biasing three kinds : neutral point of series resistance , the neutral point DUBLE DC bit Compensation Act . Three methods have their own advantages and disadvantages , the first two methods to consider itself safe operation of the factors and substation relay protection parameters such as pressure, temperature of the resistance and capacitance factors , these two methods is suitable for small - and medium - capacity transformer . DC bit Compensation Act do not need to consider other factors , can be directly attached to , but need to consume a lot of power , suitable for the larger capacity transformer . Demand should a substation , according to the mechanism of DC magnetic bias , as well as a - DC compensation suppression method , design and production of a DC offset power to suppress the neutral point of the transformer DC magnetic bias the compensation power can be maintained at the DC current of the neutral wire within the range allowed by a transformer , while the power supply control system can detect and display the size of the current neutral line of the DC current .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > General issues > Testing,operation
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