The Hubbell 200A 35kV Loadbreak Bushing Insert is a crucial component in underground electrical distribution systems, primarily used to provide a separable, fully shielded, and submersible connection for high-voltage cables to apparatus like transformers, switches, and sectionalizing cabinets
Key Features:
Purpose and Function:
Accessories Included:
Applications:
Resources:
Key Features:
- Voltage Rating: 35 kV class (meaning it’s designed for systems with a nominal voltage up to 35,000 volts).
- Current Rating: 200 Amperes continuous. They also have fault-close and switching capabilities for temporary overcurrents.
- Material: Typically made from high-quality, peroxide-cured EPDM rubber for excellent insulation, stress relaxation characteristics, and long life in various environmental conditions.
- Interface Standards: Hubbell’s 35kV loadbreak bushing inserts are designed to meet or exceed IEEE Standard 386 (Standard for Separable Insulated Connectors Systems). This ensures interchangeability with other manufacturers’ products that also comply with this standard.
Purpose and Function:
- Loadbreak Capability: The “loadbreak” in its name means it’s designed to safely interrupt and establish current flow (up to 200 Amperes) while energized, using a hotstick. This is a critical operational feature for utility linemen, allowing them to de-energize and re-energize equipment in the field without requiring a primary breaker operation.
- Interface with Bushing Well: The bushing insert threads onto a standard 200A bushing well, which is typically mounted on the transformer or switchgear.Â
- Mating with Loadbreak Elbow: It forms a complete connection system when a compatible 200A loadbreak elbow connector (connected to an underground cable) is plugged into it. The elbow’s “loadbreak probe” makes contact with the “finger contacts” inside the bushing insert.
- Flexibility and Field Serviceability: This two-piece design (bushing well + bushing insert) offers flexibility. If the bushing insert is damaged, it can be changed in the field without removing the entire apparatus from service, unlike integral bushings.Â
- Fully Shielded and Submersible: Constructed from EPDM rubber (a highly durable and insulating material), these inserts are designed to be fully shielded (dead-front) and can be safely submerged in water, making them suitable for underground applications.
Accessories Included:
- 3 Insulated Parking Bushing
- 3 Loadbreak 235BI
- Elastimold Rod 370TR 15-35kV
- 3 Adjustable Screws
- Silicone Lubricant
Applications:
Hubbell 200A 35kV Loadbreak Bushing Inserts are widely used in:
- Underground Distribution Systems: Connecting underground high-voltage cables to distribution transformers.
- Switchgear and Sectionalizing Cabinets: Providing points for connection, switching, and fault isolation in underground electrical networks.
- Renewable Energy Interconnections: Used in solar farms or wind power installations to connect medium-voltage cables.
- Industrial and Commercial Facilities: For reliable and flexible power connections where underground routing is preferred or required.
Resources:
