Corona ring is classified into closed corona ring of ordinary type, bird-preventing helmet closed ring, semi-ring by structure; die-cast aluminum, aluminum tube and stainless steel tube by material. The abovementioned rings are all of current-leading structure, that is, in the case of pollution flashover or lightening flashover when the composite insulator is operating, the current will be directly led to the terminal of end fittings instead of flowing through the terminal sheath and crimping part, so as to protect the seal part from damage and the crimping part from the impact of thermal expansion thereby resulting in the grip strength reduction of the metal fittings.
NO. Outer diameter of grading ring (mm)Remarks1160Used for the high voltage terminal of 750kV product2 232Used for the high voltage terminal of 1000kV productUsed for the high voltage terminal of±800kV product3250Used for the product of 110kV-220kV4260Used for the product of 110kV-220kV5300Used for the product of 220kV-330kV6350Used for the product of over 330kV-500kV7370Used for 500 kV product8400Used for ±500kV product9450Used for the low voltage terminal of750kV product10560Used for the low voltage terminal of±800kV product
Aluminum Alloy Corona Hollow rings mainly use for HV overhead transmission line，HV Surge Arresters，High Voltage Test Equipment，such as HV composite silicone rubber long rod insulators Corona Rings/Grading rings. High Voltage Capacitor Banks Corona Rings/Grading rings GIS (Gas Insulated Switchgear) Corona Rings/Grading rings Transmission line & Substation Corona Rings/Grading rings TRIDELTA HV Surge Arrestor Corona Rings/Grading rings Shunt Reactor Corona Rings/Grading rings Power Transformer, current transformer, AC test transformer, voltage transformer Power cable (accessory), High voltage laboratory (High voltage test equipment), Impulse voltage test system, HV capacitor bank, HV transmission line (overhead line) Transformer aluminum alloy rings and so on Corona Ring Installation for Transmission Insulators High Voltage Insulator with Corona rings