This document describes dead‑tank SF6 circuit‑breaker complying with IEC 62271‑100:2021 and IEEE Std C37.09 circuit‑breaker standards as well as IEC 60068‑2‑series environmental test requirements. It adopts earthed aluminium‑alloy tank with compression‑type arc‑extinguishing principle and proven modular hydraulic‑spring operating mechanism fitted with mechanical anti‑slow‑opening protection.
Pollution‑resistant silicone‑rubber composite bushings are adopted. Through‑core current transformers are integrated inside tank, and external CT can be added as required. Secondary control, monitoring, heating & dehumidification functions are centralized in local control cabinet, supporting local/remote mode switching, SF6 density monitoring, alarm and low‑pressure interlock protection.
The manual covers structural principle, unpacking, hoisting, on‑site installation, gas‑filling and commissioning procedures, specifying bolt torque, SF6 handling and adsorbent replacement rules. It also provides periodic inspection criteria, minor‑repair / overhaul trigger conditions, troubleshooting, transportation‑storage and decommissioning recycling guidance.
Safety risks and countermeasures for hoisting, gas‑handling and secondary‑circuit work are clearly documented, delivering comprehensive technical reference for design, construction and O&M in large‑scale substations and hydropower plants.