Offshore equipment distribution line ground fault monitoring system

Abstract

The invention relates to a grounding fault monitoring system for a distribution line of marine equipment. The grounding fault monitoring system comprises sampling resistors, sampling switches, a self-check change over switch, a grounding sampling resistor, an isolation amplifier, an analog-to-digital converter, a microcontroller, a mechanical relay and a solid state relay, wherein the upper end of a positive end sampling resistor is connected with a positive pole conductor for the distribution line; the lower end of the positive end sampling resistor is connected with the upper end of a positive end sampling switch; the upper end of a negative end sampling resistor is connected with a negative pole conductor for the distribution line; the lower end of the negative end sampling resistor is connected with the upper end of a negative end sampling switch; the upper end of the self-check change over switch is connected with the negative pole conductor for the distribution line; the lower end of the positive end sampling switch, the lower end of the negative end sampling switch and the lower end of the self-check change over switch are connected with the upper end of the grounding sampling resistor; two ends of the grounding sampling resistor are connected with the isolation amplifier; the isolation amplifier is connected with the analog-to-digital converter; and the analog-to-digital converter is connected with the microcontroller. The grounding fault monitoring system for a distribution line of marine equipment can monitor all the grounding fault situations for the positive-pole and negative-pole conductors in the distribution line of marine equipment, including the situation that only a grounding fault occurs only in one conductor or both in two conductors, and can realize grounding fault monitoring for the distribution line when the marine equipment is running.

Description

technical field [0001] The invention belongs to the technical field of seabed electric power, and relates to a ground fault monitoring system for power distribution lines of marine equipment, in particular, it is used for monitoring the positive and negative poles of power distribution lines used by underwater power supply equipment in marine equipment to supply power to external power consumption equipment. The grounding resistance of the two-pole supply conductor. Background technique [0002] With the increasing emphasis on marine research and development at home and abroad, various marine equipment such as electric-driven marine observation equipment, underwater robots, and submarine production systems have become more and more widely used. These marine equipment are mainly composed of underwater power supply equipment and various underwater electrical equipment, and the power distribution lines between the power supply equipment and the electrical equipment are mainly v...

AI Technical Summary

Problems solved by technology

The defect of the existing technology is that the grounding resistance of the positive and negative pole conductors in the distribution line is not considered in the calculation at the same time, and the calculation results are unreliable in the case of the more common ground fault of the two pole conductors at the same time

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