Aug 2026· Energies· Vol 19, pp. 3970· 0 citations· 15 references
Abstract
High-voltage direct current (HVDC) transmission is ideal for long-distance, large-capacity power delivery. A DC common earth electrode can be used for multiple DC lines, reducing the difficulty of land acquisition and lowering investment in grounding leads in power construction. The operating conditions of DC common earth electrodes are complex, and variations in earth resistance can cause ground potential rise (GPR), excessive step voltage, and other safety hazards. This paper proposes a technical scheme for online monitoring of DC earth resistance, verifies its feasibility through simple simulations, and finally validates the monitoring scheme using actual engineering parameters of the CH common earth electrode project through simulation. This study provides ideas and technical guidance for multiparameter monitoring of DC common earth electrodes and offers data to support the online monitoring of similar electrode groups.
The grounding system is an essential component of power installations that provides a low-impedance path for fault currents to flow safely into the earth, thereby protecting personnel and equipment from hazards associated with touch and step voltages. Excessive grounding resistance can reduce the effectiveness of prote...
The hybrid operation of grid-following (GFL) and grid-forming (GFM) renewable energy units can lead to phase-reference inconsistencies and distorted transient impedance trajectories, which in turn cause maloperation or failure-to-operate of conventional distance protection. To address this issue, this paper proposes a...
This paper presents the design and analysis of a common-grounded high step-up DC–DC converter operating under open-loop control. The proposed converter employs two switches (S1 and S2) with a fixed 50% duty cycle to achieve high voltage gain without the need for extreme duty ratios. The topology maintains a common grou...
K. D. Kumar, S. D. Ashokaraju· International Journal of Res...· 0 citations
Noninvasive voltage measurement is crucial for the condition monitoring and fault diagnosis of ultrahigh-voltage direct current (UHVDC) systems. Existing electric-field inversion methods often suffer from sensitivity to sensor placement and vulnerability to common-mode interference, limiting their practical accuracy. T...
Ze-Hao Li, Xiao-Ni Wang, Zi-Jian He et al.· IEEE Transactions on Instrum...· 0 citations
Very Fast Transient Overvoltages (VFTOs) are one of the major insulation stress phenomena encountered in Gas
Insulated Substations (GIS). VFTOs are generated primarily during disconnector switching operations and are characterized by
extremely steep wavefronts, high frequency oscillations, and short durations. These tr...
M. Prabhakar, V. Anil, I. Chandramouli et al.· International Journal for Re...· 0 citations
Low-voltage networks are designed as solidly grounded neutral networks (TN, TT) or isolated neutral networks (IT). The latter type is used when continuity of supply and effective protection against electric shock are required despite a single ground fault. A characteristic feature of the IT network is the application o...
