UL 6141-2020 pdf download

UL 6141-2020 pdf download.Wind Turbines Permitting Entry of Personnel.
3 Glossary For the purpose of this standard, the following definitions apply. 3.1 DOWN TOWER – The space in and around a wind turbine location that is at or near ground level such as the base level of the turbine tower. 3.2 ELECTRIC POWER SYSTEM (EPS) – Equipment or facilities that deliver electric power to a load(s). The most common example of an EPS is an electric utility. 3.3 MAXIMUM CURRENT(S) – The maximum peak current(s) a wind turbine will produce. There may be several maximum current ratings defined for a product or system, such as alternator/generator output, inverter/converter output, and control output circuits. 3.4 MAXIMUM OUTPUT POWER – The maximum average power output a wind turbine in normal steady-state operation will produce over a one minute period of time. Note that the peak power output can be greater. 3.5 MAXIMUM VOLTAGE – The maximum peak voltage a wind turbine will produce during operation, including open circuit conditions. 3.6 MEDIUM VOLTAGE – More than 1000 Vac or 1500 Vdc. 3.7 NACELLE – The housing or enclosure for the alternator/generator and other wind turbine parts that is generally located at the top of the tower. 3.8 OVERVOLTAGE – Any voltage having a peak value exceeding the corresponding peak value of maximum steady-state voltage at normal operating conditions. 3.9 OVERVOLTAGE CATEGORY – A numeric classification that defines a transient overvoltage condition: a) Overvoltage categories I, II, III, and IV are used per IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1: Principles, requirements and tests. b) The term “overvoltage category” in this standard is synonymous with “impulse withstand category” used in IEC 60664-4-44, Low-voltage electrical installations – Part 4-44: Protection for safety – Protection against voltage disturbances and electromagnetic disturbances.
3.13 POLYMERIC MATERIAL – Materials that are either natural or synthetic and are primarily composed of chained molecules of monomers, combinations of monomers, combined polymers, crosslinking agents, fillers, colorants, and other materials. 3.14 RATED POWER – The output power of the wind turbine when operating at its rated wind speed in accordance with IEC 61400-12-1, Wind turbines – Part 12-1: Power performance measurements of electricity producing wind turbines. Note: The method for measuring wind turbine power output is specified in IEC 61400-12-1. 3.15 SAFETY RELATED CONTROLS SYSTEM (SRCS) – Assembly of equipment that includes the critical controls and protection functions that maintain the wind turbine within its mechanical and structural design limitations. This includes the evaluation of electrical control and protection functions, limits, operation, and response times during normal, abnormal, and failure conditions. The SRCS may include electromechanical components. 3.16 SWITCHGEAR – The combination of switching and interrupting devices that are used with associated control, instruments, metering, protective, and regulating accessories. Switchgear also includes associated interconnections and other electrical accessories, and supporting structures used primarily for the generation, transmission, distribution, and conversion of electric power. 3.17 SWITCHGEAR ASSEMBLY – Assembled indoor or outdoor equipment provided with a supporting structure, one or more enclosures, conductors, electrical interconnections and other accessories that includes switching, interrupting, control, instrumentation, metering, protective, and regulating devices. 3.18 TURBINE PROTECTION SYSTEM – System intended primarily to provide protection for a wind turbine structure in the event of the following conditions: short circuits, excessive vibration, rotor or generator overspeed, extreme temperature, or extreme wind.
4 Special Components and Subassemblies of Wind Turbines 4.1 General 4.1.1 For the purpose of this standard, the medium voltage requirements are to be applied to circuits that operate at greater than 1000Vac / 1500 Vdc nominal. 4.1.2 WT equipment and subassemblies, other than those noted in this section and 2.1, Components, shall comply with (at minimum) one of the following standards: a) The Standard for Industrial Control Panels, UL 508A; b) The Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1: Safety Requirements – Electrical, Thermal and Energy, UL 61800-5-1, or c) UL 60947 Low-Voltage Switchgear and Controlgear – Part 1: General Rules along with any of the following UL 60947 part 2 standards: 1) UL 60947-4-1, Low-Voltage Switchgear and Controlgear – Part 4-1: Contactors and Motor-Starters – Electromechanical Contactors and Motor-Starters; 2) UL 60947-4-2, Low-Voltage Switchgear and Controlgear – Part 4-2: AC Semiconductor Motor Controllers and Starters l Contactors and Motor-Starters; 3) UL 60947-5-1, Low-Voltage Switchgear and Controlgear – Part 5-1: Control Circuit Devices and Switching Elements – Electromechanical Control Circuit Devices; 4) UL 60947-5-2, Low-Voltage Switchgear and Controlgear – Part 5-2: Control Circuit Devices and Switching Elements – Proximity Switches; 5) UL 60947-7-1, Low-Voltage Switchgear And Controlgear – Part 7-1: Ancillary Equipment – Terminal Blocks for Copper Conductors; 6) UL 60947-7-2, Low-Voltage Switchgear and Controlgear – Part 7-2: Ancillary Equipment – Protective Conductor Terminal Blocks for Copper Conductors 7) UL 60947-7-3, Low-Voltage Switchgear and Controlgear – Part 7-3: Ancillary Equipment – Safety Requirements for Fuse Terminal Blocks.UL 6141-2020 pdf download.