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Standard

NEK IEC TS 61400-21-4:2025

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Abstract

urn:iec:std:iec:61400::::This part of IEC 61400, which is a Technical Specification, specifies a uniform methodology, defining measurement, testing and assessment procedures of electrical characteristics of wind turbine components and subsystems, as basis for the verification of the electrical capabilities of wind turbines and wind turbine families.This document includes the following aspects:definitions of test bench, subsystems and interface;definitions of system requirements for the test bench to perform relevant measurements (grid strengths, short circuit power, THD, …);measurement procedures for quantifying the electrical characteristics;test and measurement procedures for verifying and validating the electrical characteristics of components and subsystems in relation to grid compliance requirements;procedures for the transferability of the component and subsystem test results, measured at the test bench, to WT product families;documentation requirements and validation procedures of components, subsystems and wind turbines.The results of the measurements and assessments of the wind turbine components and subsystems will be used as input for the verification of electrical capabilities as described in urn:iec:std:iec:61400-21-1::::IEC 61400-21-1 and for the validation and verification of the electrical simulation models for wind power plants (WPP) as described in urn:iec:std:iec:61400-27::::IEC 61400-27.Out of scope of this technical specification are:design requirements of test bench systems;model development of WT subsystems and WT as e.g. described in the urn:iec:std:iec:61400-27::ser::IEC 61400-27 series;Power Plant control function test (e.g. FSM, Voltage Control) as described in urn:iec:std:iec:61400-21-2::::IEC 61400-21-2;specific component design test and validation of the wind turbine equipment (switchgears, cables, transformer, generator etc.), which are covered by other IEC standards;mechanical, structural loads and lifetime test;noise and acoustical measurements;certification procedures and grid compliance at wind power plant level;communication system functional and performance tests as defined in e.g. the urn:iec:std:iec:61400-25::ser::IEC 61400-25 series.For the purposes of this document, the following terms for system voltage apply, based on urn:iec:std:iec:60038::::IEC 60038:Low voltage (LV) refers to 100 V Medium voltage (MV) refers to 1 kV High voltage (HV) refers to 35 kV Extra high voltage (EHV) refers to Un > 230 kV.

Document information

  • Standard from NEK
  • Published:
  • Edition: 1.0
  • Version: 1
  • Document type: TS
  • ICS 27.180

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  • Adopted from: IEC TS 61400-21-4:2025