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Porcelain station post insulator C6-550,C10-550
Porcelain station post insulator C6-550,C10-550 is the solid core substation insulator, with different cantilever strength and the same lightning impulse withstand voltage, they can be used at the same place but withstand different mechanical strength. The insulator price of Porcelain station post insulator C6-550 is a little cheaper than C10-550.
The lightning impulse withstand voltage of each porcelain station post insulator C6-550,C10-550 is according to IEC 71-1. The station post insulator is composed of one or several insulator part, as for a certain given height, the insulator appearance, dimension and end fitting shape all influence the electrical quality.
Porcelain station post insulator C6-550,C10-550
The mechanical strength rank is calculated according to the status when the porcelain station post insulator C6-550,C10-550 is assembled upright, and the load is applied on the top of the porcelain insulator, the minimum value of the failing load is its mechanical strength.
Solid core porcelain station post insulator C6-550,C10-550 is made by porcelain or ceramic material, and it is used as the insulation and supporting part on the stustations. Solid core station post insulator is assembled with iron end fittings on both end of the porcelain station post insulator C6-550,C10-550, and have thread hole, the holes can be connected with other parts of the substation.
IEC 60273 has more code numbers of the 550kv lightning impulse withstand voltage, that is C2-550, C4-550, C8-550, C10-550, C12.5-550, C16-550, C20-550. All these porcelain station post high voltage insulator for substation should has parameters as follows:
Cantilever strength: 2KN, 4KN, 6KN, 8KN, 10KN, 12.5KN, 16KN, 20KN
Lightning impulse withstand voltage: 550KV
Power frequency withstand voltage wet: 230KV
Height of insulator: 1220mm
Creepage distance: 1970mm, 2900mm
Fixing diameter of end fitting hole: 127, 178, 200 or 254mm
