UL 6141-2016 pdf download
UL 6141-2016 pdf download.Wind Turbines Permitting Entry of Personnel.
4.5.2 The conductors and components shall comply with the applicable standard(s) selected in regards to operating temperature range. environmental conditions, electrical isolation, electrical impulse withstand. and short circuit withstand capabilities as necessary for the electrical and environmental conditions within the turbine.
4.5.3 Vertical power transmission equipment shall be constructed with sufficient mechanical strength to withstand the foreseeable mechanical forces (deflection, movement and loading) for its use in accordance with IEC 61400-1, Wind turbines — Part 1: Design requirements.
4.5.4 The evaluation of these vertical bus bar systems shall account for the following conditions:
a) Static loading on system components;
b) Expected deflection and forces on the transmissions, assemblies, arid support structure resulting from bending of the tower under anticipated extreme conditions;
C) Expected force direction and magnitude of displacement of the assembly:
d) Component fatigue, loosening of fasteners;
e) Degradation, wear, deformation and creep of polymeric electrical insulating materials:
f) Loss of intended electrical conductivity or loss of electrical isolation;
Note: Loss of intended conductivity Is often the result of loose electrical connections o boken conductors. Loss of instiation is often the result of worn or broken insulation materials or loss of electrical spacings.
g) Operation for the intended turbine life span or specified maintenance period for the assembly.
h) The assembly noted in (9) may be evaluated by testing, analysis or a combination of the two.
4.5.5 Scaled testing may be used to represent the complete system specified in 4.5.4.
4.5.6 The mechanical and structural suitability of the assembly and supporting members may be addressed via analysis per the design load case evaluation. In this case, the design load cases shall specifically include and address the forces on the assembly, subassemblies and components including insulating and conducting materials.
Note: If the analysis method does not include effects of abrasiortwear and material creep on me polymeric e4ectrical insulation. testing may be necessary,
4.12 Slip rings
4.12.1 General
4.12.1.1 Slip rings used for transmission of power. control, or signal circuits within rotating elements of the wind turbine shall be evaluated to the requirements of the Standard for Industrial Control Equipment, UL 508, or lEG 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements.
Exception: Motor and generator slip rings shall be evaluated to the specific component standard and are excluded from this section.
4.12.1.2 Slip rings rated above 1500V shall be evaluated by either:
a) Construction using the spacings requirements from the Standard for Medium-Voltage AC Contactors, Controllers, and Control Centers. UL 347, and the test requirements from the Standard for Industrial Control Equipment, UL 508, based upon the intended operating voltage; or
b) IEC 60204-11, Safety of machinery — Electrical equipment of machines — Part 11:
Requirements for HV equipment for voltages above 1 000 V a.c. or 1 500 V d.c. and not exceeding 36 kV.
4.12.1.3 Temperature tests specified in the standards referenced in 4.12.1.2 shall be conducted with the unit rotating as intended in its end-use installation as well as in a fixed position.
4.12.1.4 The slip ring circuits and ground paths shall have short circuit ratings equal to or greater than the overcurrent protection provided in the end-use installation or shall withstand fault current levels in accordance with the following standards:
a) Standard for Industrial Control Equipment, UL 508.
b) IEC 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: general requirements,
C) lEG 60204-11, Safety of machinery — Electrical equipment of machines — Part 11:
Requirements for HV equipment for voltages above 1 000 V a.c. or 1 500 V d.c. and not exceeding 36 kV.
