Analysis on Relay Action Caused by AC-DC Interference to Positive or Negative Pole of DC System
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Abstract
AC-DC Interference can cause relay protection misoperation, it is still lack of workable theory and digital simulation models. In this paper, a theory analysis and digital simulation models of AC-DC Interference are proposed. The theory analysis and simulation models are proved correctly by experiment evaluation. The capacitance of cable to ground, resistance for current limit and AC interference voltage are the major factors to affect the voltage between the relay terminals. Finally, proposals of improving the relay action power, reducing the capacitance of cable to ground, choosing a reasonable resistance for current limit and checking the capacitance to ground regularly are presented.
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