IEC TS 62271-316:2024

Overview

IEC TS 62271-316:2024 is a Technical Specification that defines requirements for direct current by‑pass switches (BPS / CBPS) and paralleling switches (PS) used in HVDC transmission systems. It applies to mechanical DC switching devices intended for indoor or outdoor installation and for operation at direct voltages of 100 kV and above. Non‑mechanical switching technologies for the same applications are explicitly excluded.

Key topics and technical requirements

The document organizes practical and test requirements across the full product lifecycle. Major technical topics include:

• Scope, terms and definitions - consistent vocabulary for BPS, PS, assemblies and operational characteristics.
• Normal and special service conditions - environmental and site conditions that influence design and testing.
• Ratings - rated direct voltage, rated insulation levels, rated continuous and short‑time currents, auxiliary supplies and rated operating sequences.
• Design and construction - materials and fluids (liquids/gases), earthing, auxiliary/control circuits, man‑machine interfaces (position indication, nameplates, locking), mechanical loads, tightness and EMC.
• Type tests and routine tests - dielectric tests, resistance and continuous current tests, short‑time and peak withstand tests, tightness, EMC, X‑radiation tests for vacuum interrupters, mechanical/environmental tests and commutation tests.
• Verification and documentation - acceptance criteria, test records, tolerances and type test report contents.
• Selection, installation and maintenance guidance (informative) - selection of rated values, cable interfaces, transport/storage, installation, operating and maintenance instructions.
• Safety and environmental considerations - fire hazard, corrosion, influence on the environment and EMC.

Practical applications and who uses it

IEC TS 62271-316 is intended for:

• HVDC equipment manufacturers designing and certifying by‑pass and paralleling switchgear.
• Transmission utilities and system designers specifying switches for converter stations and series‑connected converter units.
• Testing laboratories and third‑party certifiers performing type and routine testing.
• Procurement, installation and maintenance teams requiring clear requirements for ratings, tests, documentation and safe installation/operation.
• Regulatory bodies and grid operators referencing common criteria for HVDC switchgear interoperability and safety.

Related standards

• Other parts of the IEC 62271 high‑voltage switchgear and controlgear series (for complementary requirements).
• Applicable HVDC system standards and national grid codes for system integration and protection coordination.

Keywords: IEC TS 62271-316, HVDC, direct current by‑pass switches, paralleling switches, high‑voltage switchgear, DC switchgear, type tests, rated direct voltage.