Overview
IEC TS 63042-201:2018 - UHV AC substation design is a Technical Specification that establishes common rules for designing AC substations for ultra-high-voltage (UHV) transmission systems exceeding 800 kV. Its aim is to ensure safety, reliable performance and practical operability of UHV substations, covering planning, equipment selection, layout, protection, earthing, seismic and environmental considerations.
Key topics and technical requirements
This Technical Specification provides guidance across the full substation lifecycle. Major topics include:
- System requirements and site conditions
- General design principles, operation and maintenance, environmental impact and economy.
- Bus scheme and feeder connection
- Recommended busbar arrangements (double bus, one-and-a-half CB, two-CB, etc.) and neutral earthing modes for UHV systems.
- Selection of equipment and conductors
- Voltage, current and frequency ratings; transformers, shunt/neutral reactors, switchgear, circuit breakers, disconnectors, surge arresters, bushings, insulators and conductor types.
- Equipment layout and clearances
- Minimum clearances, electromagnetic environment mitigation (electrostatic/magnetic induction and audible noise), optimal GIB layouts and serviceability.
- Protection, control and communications
- Relay protection architecture (including duplicated protection), control systems, EMC requirements and communication interfaces.
- Power supply and auxiliary systems
- DC and AC auxiliary supply, UPS and reliability provisions for control and protection.
- Gantry, support and foundation design
- Structural loads, detailing, GIS/MTS foundation forms and seismic performance.
- Earthing and lightning protection
- Earthing arrangements (including multiple-point earthing for GIS) and direct lightning strike measures.
- Annexes for practical detail
- Load combinations, equipment specifications, conductor design (including corona, electric field and noise mitigation), conductor examples and seismic standards references.
Practical applications and users
IEC TS 63042-201:2018 is intended for professionals involved in the planning, design, construction, testing and operation of UHV AC substations, including:
- Transmission system planners and utility engineers
- Substation design and civil/structural engineers
- OEMs and suppliers of UHV transformers, GIS, switchgear and conductors
- Protection & control engineers and system integrators
- Consultants, regulators and project managers for UHV projects
Use cases include design verification, technical specification writing, tendering and equipment selection for substations over 800 kV, plus guidance on corona mitigation, seismic qualification and electromagnetic compatibility.
Related standards
- Annex F cites seismic guides and standards relevant to UHV substations. For complete compliance, use IEC TS 63042-201 alongside applicable IEC standards, national grid codes and local construction/seismic regulations.