Transmission Products (T-1201)

Suspension Insulators 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.

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

Recommended Corona Rings by Line Voltage

25 kip, 30 kip, 120 kN

50 kip, 133 kN, 160 kN, 210 kN

Ground End

Line End

Ground End

Line End

Ground End

Line End

220/230 kV 330/345 kV

None None

8" (203 mm) 12" (305 mm) 12" (305 mm) 15" (381 mm)

— PSPISCRCL0083002 — PSPISCRCL0123002

— PSPISCRCL0083003 — PSPISCRCL0123007

Line Voltage (kV)

400 kV 500 kV

8" (203 mm) 8" (203 mm)

PSPISCRCL0083002 PSPISCRCL0123002 PSPISCRCL0083003 PSPISCRCL0123007 PSPISCRCL0083002 PSPISCRCL0153001 PSPISCRCL0083003 PSPISCRCL0153002

QUADRI*SIL ®

.63” Hex (16 mm)

2.0” (50.8 mm)

Quadri*Sil Suspension Insulator

8.0” (203 mm)

.75” R (19.05 mm)

1.35” (34.3 mm)

1.5” (38.1 mm)

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

Physical and Electrical Characteristics Dry Arc Distance Inches (mm) Leakage Distance Inches (mm) ANSI 60 Hz Flashover Dry—kV ANSI 60 Hz FlashoverWet —kV ANSI Critical Flashover Positive—kV ANSI Critical Flashover Negative—kV IECWet Switching ImpulseWithstand—kV IEC Power FrequencyWetWithstand—kV IEC Lightning ImpulseWithstand Positive—kV IEC Lightning ImpulseWithstand Negative—kV

220/230 kV Ring 330/345 kV Ring

400 kV Ring -1.95 (49.5)

500 kV Ring -2.67 (67.8)

-0.63 (-16)

-1.32 (33.5)

0

0

0

0

-10 -10 -10 -10 N/A -10 -10 -10

-20 -10 -20 -20 N/A -10 -20 -20

-20 -20 -30 -30 N/A -20 -30 -30

-30 -30 -40 — N/A -30 -40 -50

NetWeight lb (kg)

2.1 (1.0)

2.9 (1.3)

5.0 (2.3)

6.5 (2.9)

Page 238 | July 2016