Method and device for detecting direct-current component in alternating current
Patent Information
- Authority / Receiving Office
- CN · China
- Current Assignee / Owner
- 北京国基科技股份有限公司
- Publication Date
- 2012-05-02
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Description
technical field
[0001] The invention relates to the field of electricity, in particular to a method and a device for detecting a DC component in an AC current. Background technique
[0002] The DC component or DC bias in the power generation and transmission network will directly lead to increased noise and vibration of the grid transformer, and even cause local overheating and damage of the transformer; In severe cases, it will lead to half-wave saturation of the transformer iron core, causing a sharp increase in the excitation current and severe distortion of the waveform. A large number of high-order harmonics generated will not only cause serious interference to electrical appliances connected to the power grid, but may also cause a large amount of power consumption of the transformer. Reactive power causes voltage fluctuations in the power grid, which poses a serious threat to the safe operation of the power system and must be strictly monitored.
[0003] However, DC b...