IEC TS 61973:2012/AMD1:2019

Overview

IEC TS 61973:2012/AMD1:2019 is an essential amendment by the International Electrotechnical Commission (IEC) that addresses audible noise concerns in High Voltage Direct Current (HVDC) substations. This technical specification, developed by IEC Technical Committee 115, focuses on noise levels emitted by HVDC substations operating at DC voltages above 100 kV. The amendment updates measurement methods, sound level determination, and substation layouts to mitigate audible noise impact effectively.

The document provides updated formulas for calculating sound pressure levels, compares noise emissions of HVDC systems with AC power transformers, and revises sound intensity measurement techniques. It also includes informative annexes depicting typical HVDC substation layouts that influence noise control strategies.

Key Topics

• Sound Pressure Level Measurement
  The amendment revises formulas for calculating the average A-weighted sound pressure level (L_pA), ensuring accurate evaluation of audible noise surrounding HVDC substations.

• Noise Comparison with AC Transformers
  Updated mathematical models estimate and compare the sound power levels of HVDC substations with traditional AC power transformers, providing better understanding of noise characteristics in different systems.

• Substation Sound Intensity Measurement
  Improvements in sound intensity measurement methods, including refined formulas and explanations, promote consistent and reliable noise assessments in HVDC environments.

• Substation Layouts and Noise Control
  New annexes offer visual examples of typical twelve-pulse and dual twelve-pulse HVDC substation layouts. These layouts play a crucial role in controlling and reducing audible noise by optimizing the arrangement of valve halls, transformers, and switching yards.

• Normative References Update
  The amendment integrates key references to IEC 60076-10 and IEC 60076-10-1, which cover power transformer sound level determination and application guidance, aiding standardized noise evaluation procedures.

Practical Applications

• HVDC Substation Design
  Electrical engineers and designers can apply the updated noise assessment methods and layout recommendations to minimize audible noise pollution from HVDC substations, ensuring compliance with environmental and regulatory standards.

• Environmental Noise Management
  Utilities operating HVDC transmission systems can utilize this standard to monitor and manage noise emissions effectively, reducing the impact on neighboring communities and ecosystems.

• Transformer and Equipment Manufacturers
  Manufacturers of HVDC substation components can reference this amendment to improve product designs focusing on sound reduction capabilities, enhancing their competitiveness and market acceptance.

• Noise Impact Assessments
  Consultants and regulatory bodies conducting noise impact assessments for new or existing HVDC substations benefit from the standardized definitions, measurement techniques, and layout guidance detailed in the amendment.

Related Standards

• IEC 60076-10: Power Transformers – Determination of Sound Levels
  Provides methodologies for measuring transformer sound emissions, crucial for accurate noise evaluation in substations.

• IEC 60076-10-1: Power Transformers – Application Guide for Sound Level Determination
  Offers guidance and best practices for applying sound measurement standards related to power transformers within HVDC substations.

• IEC TS 61973:2012 – Base Technical Specification for HVDC Substation Audible Noise
  The foundational document upon which this 2019 amendment builds, defining initial measurement criteria and noise management strategies for HVDC facilities.

Conclusion

IEC TS 61973:2012/AMD1:2019 plays a vital role in standardizing the measurement and control of audible noise in HVDC substations. By enhancing sound pressure level calculation, refining sound intensity measurement, and showcasing optimized substation layouts, this amendment supports improved environmental compliance and operational excellence. It is a critical resource for HVDC system designers, operators, and regulatory agents committed to reducing noise pollution and ensuring sustainable power transmission infrastructure.

For detailed information and updates, access the IEC webstore or contact your local IEC member committee.