Working Principle of the 25kV 600A Deadbreak Apparatus Bushing
1. Basic Function
The 25kV 600A Deadbreak Apparatus Bushing is an epoxy-molded high-voltage electrical component designed for sidewall mounting in transformers, switches, and other oil-filled electrical equipment. It provides a 600A current-carrying capacity and supports 25kV (15.2kV line-to-ground) applications. Its core functions include:
Electrical conduction – Ensures stable power transmission at 600A.
Insulation & sealing – Prevents electrical breakdown or leakage between internal equipment (e.g., transformer oil) and the external environment.
Separable connection – Compatible with IEEE Std 386-2016 compliant 600A separable connectors (e.g., T-body, deadbreak elbow).
2. Working Principle
(1) Electrical Connection
Internal conductor – A conductive core (typically copper or copper alloy) is fixed to internal equipment (e.g., transformer windings or switch contacts).
External interface – Uses standardized 600A separable connectors (e.g., deadbreak elbow or T-body) for plug-and-play cable or busbar connections, enabling quick installation and maintenance.
(2) Insulation Design
Epoxy resin molding – High dielectric strength epoxy ensures no partial discharge or surface flashover at 25kV.
Multi-layer insulation –
Primary insulation – Uniform electric field distribution to prevent breakdown between the conductor and equipment housing.
Interface sealing – Gaskets prevent oil leakage at mounting surfaces (e.g., transformer tank).
(3) Compatibility & Standardization
Complies with IEEE Std 386-2016, ensuring interchangeability with all 600A separable connectors (e.g., elbows, loadbreak connectors).
Supports multiple voltage classes:
15kV class (8.3kV line-to-ground)
25kV class (15.2kV line-to-ground)
28kV class (16.2kV line-to-ground)
(4) Mechanical & Environmental Protection
Sidewall mounting – Securely installed into transformer or switchgear enclosures, resistant to internal oil pressure.
Oil-resistant – Suitable for transformer oil or equivalent insulating mediums.
3. Typical Applications
Transformers – High-voltage cable terminations.
Switchgear – Ring Main Units (RMUs), load break switches.
Fault isolation – Works with deadbreak connectors for de-energized operations (hot-stick operable after de-energization).
4. Key Advantages
High reliability – Epoxy insulation resists aging, moisture, and heat for extended service life.
Modular design – Compatible with various separable connectors for flexible system expansion.
Safety certified – Full compliance with IEEE Std 386-2016 for guaranteed electrical performance.