Oct 24, 2023 · The paper provides a state-of-the-art analysis about grounding schemes and protection of DC microgrids in ships. The reviewer comments are as follows: - Page 2, line 72:
With very few exceptions, industrial or commercial power systems grounding is dictated by Article 250 of the National Electrical CodeT (NEC). The notable exceptions are power companies and mining systems.
The system grounding arrangement is determined by the grounding of the power source. For commercial and industrial systems, the types of power sources generally fall into four broad categories: Utility Service: The system grounding is usually determined by the secondary winding configuration of the upstream utility substation transformer.
A grounding system is isolated from other grounding systems by delta windings in three-phase systems. It only takes one delta winding to accomplish isolation; not both primary and secondary windings. There are four separate grounding systems illustrated in Figure 1. Figure 1. Grounding systems
The rectification calculation of the grounding resistance value is the core of it, which can effectively limit the system fault current and voltage, makes it easy to detect faults, and the system can continue to operate when there is a single grounding fault.
The topic of system grounding is extremely important, as it affects the susceptibility of the system to voltage transients, determines the types of loads the system can accommodate, and helps to determine the system protection requirements. The system grounding arrangement is determined by the grounding of the power source.
A multiphase rectifier generator can be used for DC output side grounding. It can be divided into four ways: positive grounding, negative grounding, constructing neutral grounding, and DC midpoint lead grounding [ 50 ].
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