Alternative current electric crosstalk and insulation fault monitoring line selection method of direct current system

Abstract

The invention relates to an alternative current electric crosstalk and insulation fault monitoring line selection method of a direct current system. The direct current system is formed by an upper computer, a monitoring device, a sampling system and a current sensor. The alternative current electric crosstalk and insulation fault monitoring line selection method includes the steps of extracting a ripple crest value in the direct current system through extracting of an alternating component effective value, adopting the alternative current and direct current component separation digital filtering technology, the direct current leakage current detection technology, the recommend standard 485 (RS485) isolation communication technology and the fast fourier transform algorithm (FFT) conversion technology to monitor system bus over-the-ground alternative and direct current voltage and a ripple voltage peak value in real time to give an alarm, receiving loop leakage current information uploaded by a data collector, carrying out intelligent analysis through mode matching technology, calculating grounding resistance, carrying out artificial intelligence mode matching on feature status information of each loop and configured feature rules in the system, enabling the alternative current electric crosstalk faults, ripple voltage peak value monitoring data, grounding fault and insulation fault loop status information, loop information and the like which to be displayed on a liquid crystal display, assisting operation and maintenance workers to accurately know the current status to rapidly remove the faults.

Description

technical field [0001] The invention relates to a DC system detection method, in particular to a DC system AC series and insulation fault monitoring line selection method. Background technique [0002] The AC series fault in the DC system refers to the situation that the phase line in the AC power is directly or indirectly connected to the positive or negative pole of the DC system. AC series faults in DC systems are usually caused by the following two reasons: 1. Misoperation by maintenance personnel; 2. AC series faults caused by equipment with AC power supply in the DC system. AC series faults in DC systems are different from ordinary ground faults. When common ground faults occur in DC systems, single-point grounding usually does not cause harm, but only when two-point grounding faults occur can there be protective misoperations. Or refuse to operate, so after a small ground fault occurs, the maintenance personnel still have sufficient time to deal with it. However, on...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the above existing problems and deficiencies, to provide a DC system AC series and insulation fault monitoring line selection method, effectively solve the AC series in the DC system can not be found and processed in time, the AC series circuit in the DC system Inaccurate positioning, inaccurate collection of DC system voltage in the case of AC series current, difficult line selection for AC series current and insulation faults in the DC system

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