Overview
IEC/IEEE 65700-19-03:2014 - Bushings for DC application defines requirements for DC bushings used indoors and outdoors on DC systems. It covers capacitance-graded and gas-insulated bushings used as components of oil-filled converter transformers, smoothing reactors and air-to-air DC bushings. The standard specifies terminology, ratings, operating conditions, insulation levels, mechanical and electrical requirements, and detailed test procedures (type, routine and special). It replaces IEC 62199:2004 and cross-references IEC 60137 for general bushing terms and conditions.
Key Topics
- Scope and terminology: Definitions and symbols specific to bushings for DC application and differentiation from AC bushing requirements.
- Ratings and insulation levels: Rated continuous DC voltage, peak voltages, insulation coordination and pollution parameters relevant to DC systems.
- Operating conditions: Environmental, altitude and application factors that affect design, testing and installation of DC bushings.
- Mechanical requirements: Mounting, cantilever load capability and dimensional verification for interchangeability and safe installation.
- Electrical requirements and limits: Dielectric behavior under DC stress, partial discharge limits and polarity-reversal considerations.
- Comprehensive test program:
- Type tests (design verification): dry power-frequency withstand with partial discharge measurement, lightning impulse (BIL), switching impulse (SIL), temperature-rise, EMC and tightness/pressure tests.
- Routine tests: dielectric dissipation (tan δ), capacitance, BIL, DC applied voltage, polarity reversal and switching impulse tests with acceptance criteria.
- Special tests: artificial pollution, even/uneven wetting DC voltage tests and other site- or environment-specific checks.
- Installation, operation and maintenance guidance: Transport, storage, lifting, assembly, inspection, maintenance recommendations and failure reporting.
- Safety and environmental aspects: Electrical, mechanical and thermal safety considerations plus environmental recommendations.
Applications
Who uses IEC/IEEE 65700-19-03:2014 and why:
- Bushing manufacturers - to design and qualify DC bushings (capacitance-graded, gas-insulated).
- Transformer and reactor OEMs - to specify bushings for oil-filled converter transformers and smoothing reactors.
- Utilities, HVDC project engineers and asset owners - to set procurement, acceptance and maintenance criteria for DC installations.
- Testing laboratories - to perform type/routine/special tests, partial discharge and impulse withstand testing.
- Consultants and specifiers - to ensure compliance with recognized DC bushing standards in project specifications.
Keywords: bushings for DC, DC bushings, IEC/IEEE 65700-19-03, converter transformer bushings, smoothing reactor bushings, capacitance graded bushings, gas insulated bushings, partial discharge testing.
Related Standards
- IEC 60137 - General terms and conditions for bushings (normative reference).
- IEC 62199:2004 - Replaced by IEC/IEEE 65700-19-03:2014 (superseded document).