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Corona Rings

Corona Performance

Line Post Insulators
2.5" (63.5 mm) Rod Diameter Horizontal

Application 161 kv
& Below		 230 kv 345 kv
Line End
Energized
Top - NONE
Bott - NONE
Top - 2721273001
Bott - NONE
Top - 2721273001
Bott - NONE
Bottom End
Energized
Top - NONE
Bott - NONE
Top - NONE
Bott - 2721273001
Top - NONE
Bott - 2721273001

Electrical/Dimensional Changes to the Insulator
with External Corona Ring

Physical & Electrical Characteristics 220/230 kV Ring 330/345 kV Ring 400 kV Rings 500 kV Rings
Dry Arc Distance inches (mm)
 -1.86 (-47) -2.58 (-66) N/A N/A
Leakage Distance inches (mm)
 0 0 N/A N/A
ANSI 60 Hz Flashover Dry — kV
 -20 -30 N/A N/A
ANSI 60 Hz Flashover Wet — kV
 -20 -20 N/A N/A
ANSI Critical Flashover Positive — kV
 -30 -40 N/A N/A
ANSI Critical Flashover Negative — kV
 -30 -40 N/A N/A
IEC Wet Switching Impulse Withstand — kV
 N/A N/A N/A N/A
IEC Power Frequency Wet Withstand — kV
 -20 -20 N/A N/A
IEC Lightning Impulse Withstand Positive — kV
 -30 -40 N/A N/A
IEC Lightning Impulse Withstand Negative — kV
 -30 -40 N/A N/A
Net Weight pounds (kg)
 3.4 (1.5) 3.4 (1.5) N/A N/A
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