Overview
IEC TS 63042-302:2021 - UHV AC transmission systems - Part 302: Commissioning provides technical guidance for the commissioning of ultra-high-voltage (UHV) AC transmission systems. The Technical Specification defines test purposes, test items, preconditions, test methods and test acceptance criteria for both pre-commissioning and system commissioning, and specifies measurement requirements used during commissioning.
Key topics and requirements
- Scope and structure: Defines the general structure of commissioning activities, technical preparation and application scope for UHV AC projects.
- Pre-commissioning tests: Combined tests covering protection & control systems, instrument transformers, switchgear and transformer on-site checks, AC/DC auxiliary power systems and communication system tests.
- System commissioning tests: Energizing and no-load tests for key equipment, including:
- UHV power transformers (no-load energizing)
- Tertiary-connected reactors and capacitors
- UHV busbar and busbar shunt reactors
- No-load UHV transmission line energizing
- Loop closing (interconnecting) and opening (splitting) tests
- Measurement requirements: Prescribes measurement types and objectives, including:
- Transient voltage and current measurement
- Electric quantity (voltage, current, power) measurement
- Relay protection performance measurement
- Harmonic analysis
- Sound level and vibration measurements for transformers and reactors
- Dissolved Gas Analysis (DGA) for transformers/reactors
- Temperature monitoring
- Power-frequency electric and magnetic field measurements, audible noise and radio interference
- Partial discharge monitoring in GIS and transformers
- Acceptance criteria and safety: Test acceptance criteria and preconditions to ensure safe, reliable commissioning.
- Country experiences: Informative annexes summarize commissioning practices and lessons from China, Japan and India.
Applications and who uses it
This Technical Specification is intended for:
- Transmission system operators and utilities planning and executing UHV commissioning
- Substation and system commissioning engineers responsible for test planning and execution
- Protection & control engineers, relay test teams, and measurement specialists
- Equipment manufacturers, testing laboratories and consulting firms involved in on-site acceptance testing
- Project managers and regulators needing standardized acceptance criteria for UHV projects
Practical uses include preparing commissioning test plans, setting measurement campaigns, validating protection schemes, performing energizing sequences for UHV assets, and documenting acceptance for handover.
Related standards
IEC TS 63042-302:2021 is part of the IEC UHV AC transmission work. Users should reference other IEC standards on testing, protection, instrument transformers, power transformers and EMC/EMF measurement practices when developing a complete commissioning program.
Keywords: IEC TS 63042-302:2021, UHV AC transmission systems, commissioning, pre-commissioning tests, system commissioning, relay protection testing, measurement requirements, partial discharge, DGA, energizing tests.