Heat shrink, polymeric or separable: how to choose the termination

A termination, or cable termination kit, is a complex engineering device. Its primary function is to manage the transition of the cable, which has an electric field controlled by its shield, to an unshielded environment, such as the connection to a transformer or an overhead network. Without the correct control of the electric field in this transition, the dielectric stress would concentrate at the cable end, leading to partial discharges and, inevitably, to a failure.

Besides field control, the termination must provide insulation and a hermetic seal against moisture and contamination. Faced with such responsibility, choosing the correct technology is a crucial engineering decision. Let's analyze the three main solutions on the market.

Heat Shrink Terminations (Heat Shrink)

The heat shrink technology is the most traditional and widespread in the global market. Its polymeric components are designed to shrink under the application of heat, usually with a gas torch, conforming perfectly to the cable and its accessories.

Cold Shrink Polymeric Terminations (Cold Shrink)

Representing an evolution in practicality and safety, the cold shrink technology eliminates the need for heat. The termination, usually made of silicone rubber or EPDM, comes pre-expanded over a spiraled plastic core.

Separable Terminals (Separable Connectors)

This is the most advanced solution for connecting cables to equipment such as transformers and gas-insulated switchgear (GIS). They are modular systems, factory pre-tested, that offer a superior level of safety and flexibility.

An engineering-based decision

The selection of the ideal termination does not come down to “which is the best?”, but rather “which is the most suitable for this specific application?”. Factors such as the installation environment (indoor/outdoor, polluted), safety requirements (presence of gases), the need for future switching, and the criticality of the circuit must guide the decision.

The correct choice is a technical balance between performance, safety, and total cost of ownership (TCO). A partner with deep technical knowledge is essential to assist in this specification, ensuring that the implemented solution ensures maximum reliability and longevity for the medium voltage system.

At Trifásica Elétrica, we understand that every detail of your medium voltage infrastructure directly impacts the safety, efficiency, and continuity of your operation. Therefore, we deliver assertive technical specifications, based on applied engineering and the reality of your project.

If you seek reliability, performance, and safety in the choice of medium voltage terminations and accessories, count on those who are experts in the subject.