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Corona Rings

Corona Performance

Hi*Lite™ XL suspension insulators are RIV and corona free through 161 kV, by the use of integral Corona Shield Rings (CSR). Due to the small diameter of the end fittings, corona shielding is necessary at 230 kV and above. The table below details the rings necessary for voltages equal to or exceeding that listed in the column header.

Normal Applications: Top Grounded, Bottom Energized

Insulator Orientation 230 kV Ring 345 kV Ring 500 kV Rings
Suspension
25/30 K SML		 Top
Bottom		 NONE
2717613001		 NONE
2717053001		 2717613001
2717513001
Suspension
50 K SML		 Top
Bottom		 NONE
2717613002		 NONE
2717053002		 2717613002
2717513002

The physical and electrical values for the insulators on pages 26-8 through 26-10 are shown without corona protection above 161 kV. Ohio Brass has therefore provided the table below that yields the physical and electrical changes to the insulator when rings are installed for voltages above 161 kV.

Physical & Electrical Change Table

Physical & Electrical Characteristics 230 kV Ring 345 kV Ring 500 kV Rings
Dry Arc Distance inches (mm) -1.2 (-30.48) -2 (-50.8) -5 (-127.0)
Leakage Distance inches (mm) 0 0 0
60 Hz Flashover Dry - kV -10 -15 -30
60 Hz Flashover Wet - kV 0 0 0
Critical Flashover Positive - kV -15 -25 -65
Critical Flashover Negative - kV -20 -30 -65
Net Weight pounds (kg) 3 (1.8) 3 (1.8) 5.1 (2.29)
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