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Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-1
Electrical Systems Analysisand Design for Industrial
Plants
Irwin Lazar
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-2
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-3
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-4
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-5
PATH OF ELECTRICAL CURRENT
BOTH BREAKERS TRIP OUT
SECOND �GROUND FAULT
FIRST �GROUND FAULT
SECONDARY WINDING
FIGURE 3. DOUBLE LINE TO GROUND FAULT ON UNDERGROUND SYSTEMS RESULT IN �OUTAGES OF TWO CIRCUITS AND HIGH LEVEL FAULT CURRENTS CAUSING SEVERE �EQUIPMENT DAMAGE
FULL LINE-TO-LINE VOLTAGE
NORMAL LINE-TO-GROUND �VOLTAGE
NEUTRAL
GROUND POTENTIAL
NUETRAL
LINE-TO-GROUD VOLTAGE �DURING FAULT (EQUAL TO �FULL LINE-TO-LINE VOLTAGE
A. NO FAULT SYSTEM�(NEUTRAL FLOATS AT GROUND POTENTIAL
B. SINGLE LINE-TO-GROUND FAULT ON SYSTEM�(ONE LINE AT GROUND POTENTIAL
FIGURE 4 LINE-TO-GROUND VOLTAGES FOR A SINGLE LINE-TO-GROUND FAULT �ON AN UNDERGROUND NEUTRAL SYSTEM
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-6
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-7
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-8
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-9
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-10
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-11
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-12
Irwin Lazar — Electrical Systems Analysis and Design for Industrial Plants B-13