Method of eliminating ferromagnetic resonances
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHONGQING UNIV
- Publication Date
- 2013-07-10
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Abstract
Description
technical field
[0001] The invention relates to the electromagnetic field, in particular to a method for eliminating ferromagnetic resonance. Background technique
[0002] PT (potential transformer) ferroresonant overvoltage is the most common internal overvoltage in ungrounded neutral systems and causes the most accidents. In order to limit the PT ferroresonant overvoltage, those skilled in the art have proposed various solutions.
[0003] (1) PT open delta connection damping resistor. Its shortcomings are: when selecting the resistance, if the resistance is too large, it will not achieve the effect of eliminating the association, if the resistance is too small, when the system occurs single-phase grounding and runs continuously for 1~2 hours, it is required that the PT has a large enough Therefore, the incandescent lamp is generally selected as the damping resistor, and the resistance of the cold state is low, and the resistance of the cold state is high. However, ferro...