摘要：GROUNDING FAULT CURRENT DISTRIBUTION AND THE REDUCTION FACTOR OF A POWER CABLE IS AN IMPORTANT PARA...GROUNDING FAULT CURRENT DISTRIBUTION AND THE REDUCTION FACTOR OF A POWER CABLE IS AN IMPORTANT PARAMETER FOR THE DESIGN OF SUBSTATION GROUND GRID, THE CORRECT ESTIMATION OF THE SAFETY CONDITIONS (STEP AND TOUCH VOLTAGES) IN THE SUPPLIED SUBSTATION AND THE INTERFERENCE TO THE COMMUNICATION SYSTEM NEARBY. IN THIS PAPER, A SIMPLIFIED EQUIVALENT MODEL IS PRESENTED FOR THREE SINGLE-CORE CABLE SHEATHS, WHICH ARE TWO-ENDS GROUNDED. BOTH OF THE CABLE SHEATHS WITH OR WITHOUT APPLIED CROSS-BONDING CONNECTION ARE DISCUSSED HERE. BASED ON THIS, THE PAPER PRESENTS AN ORIGINAL ANALYTICAL PROCEDURE FOR DETERMINATION THE GROUND FAULT REDUCTION FACTOR WHEN A GROUND FAULT HAPPENS IN THE SUBSTATION SUPPLIED BY HV CABLE NETWORK. THE METHOD IS PROVED TO BE A PRACTICAL AND PRECISE ONE FOR EVALUATING THE GROUND CURRENT DISTRIBUTION AND THE REDUCTION FACTOR IN HV CABLE SYSTEM.显示全部
摘要：THIS PAPER INTRODUCES A KIND OF METHOD FOR QUICKLY CALCULATING LINE CURRENT UNDER EMERGENCY STATE. ...THIS PAPER INTRODUCES A KIND OF METHOD FOR QUICKLY CALCULATING LINE CURRENT UNDER EMERGENCY STATE. THE SAFETY MARGIN INDEX OF LINE CURRENT IS INTRODUCED. THE INDEX IS USED TO IDENTIFY THE KEY LINES AFFECTED BY THE TRIPPING LINE AND FORECAST THE SYSTEM MULTIPLE FAULT EVENT. BASED ON ABOVE ALL, THE RELIABILITY EVALUATION ALGORITHM USING STATE PRUNING BASED ON MARGIN OF SAFETY IS PROPOSED. THE MARGIN OF SAFETY INDEX IS APPLIED TO SCREENING OUT FAILURE EVENTS WITH SMALL SAFETY MARGIN. IT CAN EFFECTIVELY PRUN SYSTEM FAILURE STATE SPACE AND COORDINATE THE CONFLICT BETWEEN SPEED AND PRECISION OF EVENT RELIABILITY ANALYSIS. THE APPLICATION SHOWS THAT THE METHOD IN THIS PAPER CAN NOT ONLY EFFECTIVELY IMPLEMENT INFLUENCE AND PRUNING ANALYSIS OF EVENT RELIABILITY, BUT ALSO REFLECT CHANGE RELATIONS OF SYSTEM RELIABILITY INDICES WITH SAFETY MARGINS OF LINE CURRENTS. THE CRITICAL VALUE OF SAFETY MARGIN IN RELATION TO THE RISK OF CASCADING FAILURE CAN BE FOUND OUT. IT CAN PROVIDE REFERENCE TO DECISION-MAKING FOR PREVENTING THE OCCURRENCE OF BLACKOUTS.显示全部
