Station Post Insulator

The Station Post Insulator 57-21 is designed for substation busbar support and electrical equipment insulation. It has a rated voltage of 25 kV. The structure height is 220 mm, and the disc diameter is 127 mm. The mechanical failing load reaches 12.5 kN. The product complies with ANSI C29.7 standards. The creepage distance is 356 mm, and the dry arcing distance is 165 mm. This model belongs to the ANSI 57 series and has similar application performance to the 57-1 class. The post structure provides stable mechanical support for busbars, disconnect switches, and other substation equipment. We manufacture it with high-density electrical porcelain. The high-pressure forming process helps create a uniform ceramic body with reliable strength. The Station Post Insulator is commonly installed in 25 kV substations and medium voltage electrical systems.

Our production process follows ANSI station product requirements from forming to final inspection. The mounting dimensions are checked carefully because installation accuracy directly affects equipment assembly. Our quality department measures key dimensions, including height, mounting parts, and insulation distances. Electrical tests include power frequency dry flashover and wet flashover tests to verify insulation performance under different conditions. Mechanical bending tests are also carried out to confirm the 12.5 kN load requirement. We keep inspection records for each production batch to support quality tracking. For project applications, we can provide technical drawings, test reports, and matching hardware suggestions.

The standard delivery time is 25 to 35 days. Trial orders are available for new projects or product evaluation. We support T/T payment and common export terms such as FOB and CIF. Each unit is packed in wooden cases with internal partitions to prevent damage during transportation. Export documents, including packing lists and certificates of origin, can be prepared according to customer requirements. The warranty period is 12 months after shipment. Our team provides technical communication throughout production and delivery.

All products support custom dimensions, voltage ratings, OEM/ODM services, and manufacturing based on drawings.