BJLW 40KV 100A–1200A National Standard Transformer Bushing

A transformer bushing is an insulating device that enables one or several conductors to pass through a partition such as a wall or a tank, and insulates the conductors from it. The means of attachment (flange or fixing device) to the partition forms part of the bushing . As the main insulating device outside the transformer box, the bushing allows the lead wire of the transformer winding to pass through the insulating sleeve to insulate between the lead wire and the transformer shell, while simultaneously fixing the lead wire.

While it may appear to be a relatively simple component, the bushing is one of the most critical elements in the power system—its failure can lead to catastrophic transformer outages and extensive substation damage. The BJLW-40KV/100A~1200A Transformer Bushing represents a robust solution engineered specifically for 40kV class power transformers and distribution equipment. With a current rating range spanning from 100A to 1200A, this bushing series accommodates a wide spectrum of applications—from small distribution feeders to medium-capacity industrial circuits.

The BJLW designation indicates a specific draw-lead type bushing series with built-in current transformer functionality for transformer applications. "40KV" represents the voltage class, and "100A~1200A" indicates the continuous current rating range. The "W" in the designation typically signifies the inclusion of a current transformer (CT) integrated within the bushing assembly, providing both insulation and metering/protection capabilities in a single package.

Industry research has identified bushing failures as one of the leading causes of transformer outages worldwide. A bushing breakdown can result in:

• Catastrophic transformer failure: Internal arcing can destroy the transformer core and windings

• Extended system downtime: Replacing a large transformer can take weeks or months

• Environmental contamination: Oil leakage from ruptured bushings poses ecological hazards

• Substantial financial losses: Both from equipment replacement and lost revenue during outages

This is why the BJLW-40KV/100A~1200A Transformer Bushing is designed with multiple layers of reliability: robust insulation systems, proven sealing technologies, and compliance with internationally recognized standards.