Schweitzer Engineering Laboratories SEL-321-1 - Figure 1.4: Three-Phase and Phase-Phase Distance Characteristics

Date Code 20011026 Introduction 1-3
SEL-321/321-1 Instruction Manual
Figure 1.3: SEL-321 Rear Panel (Two I/O Board Version, showing plug-in connectors
option - other options are available)
Figure 1.4: Three-Phase and Phase-Phase Distance
Characteristics
• Four mho zones
• Two quadrilateral zones
for OOS
• Two load zones
• Set only characteristics
you need
• All zones reversible