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Corona Rings

Corona Performance

Quadri*Sil™ insulators are RIV and corona free through 161 kV. The use of an external corona shielding ring is required at 220 / 230 kV and above. The table below details the rings necessary for 220 / 230 kV and above.

Recommended Corona Ring Installation Table
Normal Applications: Top Grounded, Bottom Energized

Line
Voltage
(kV)		 Recommended Corona Rings
by Line Voltage		 Corona Ring Part Numbers
25 kip, 30 kip, 120 kN, 133 kN 50 kip, 160 kN, 210 kN
Ground End Line End Ground End Line End Ground End Line End
220/230 kV None 8" (203 mm) - 2717613001 - 2717613002
330/345 kV None 12" (305 mm) - 2717053001 - 2717053002
400 kV 8" (203 mm) 12" (305 mm) 2717613001 2717053001 2717613002 2717053002
500 kV 8" (203 mm) 15" (381 mm) 2717613001 2717513001 2717613002 2717513002


Electrical/Dimensional Changes to the Suspension Insulator
with External Corona Ring

Physical and Electrical Characteristics 220/230 kV Ring 330/345 kV Ring 400 kV Ring 500 kV Ring
Dry Arc Distance inches (mm) -0.63 (-16) -1.32 (33.5) -1.95 (49.5) -2.67 (67.8)
Leakage Distance inches (mm) 0 0 0 0
ANSI 60 Hz Flashover Dry — kV -10 -20 -20 -30
ANSI 60 Hz Flashover Wet — kV -10 -10 -20 -30
ANSI Critical Flashover Positive — kV -10 -20 -30 -40
ANSI Critical Flashover Negative — kV -10 -20 -30 -50
IEC Wet Switching Impulse Withstand — kV N/A N/A N/A N/A
IEC Power Frequency Wet Withstand — kV -10 -10 -20 -30
IEC Lightning Impulse Withstand Positive — kV -10 -20 -30 -40
IEC Lightning Impulse Withstand Negative — kV -10 -20 -30 -50
Net Weight pounds (kg) 2.1 (1.0) 2.9 (1.3) 5.0 (2.3) 6.5 (2.9)
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