【行业标准】UL 6140 Outline of Investigation for Wind Turbine Generating Systems.doc

May 1, 20091SUBJECT 6140OUTLINE OF INVESTIGATION FORWIND TURBINE GENERATING SYSTEMSIssue No. 1May 1, 2009Summary of TopicsThis is the first issue of the Subject 6140 Outline of Investigation for WindTurbine Generating Systems.The UL Foreword is no longer located within the UL Standard. For information concerning the use and application of the requirements contained in this Standard, the current version of the UL Foreword is located on ULStandardsInfoNet at: COPYRIGHT © 2009 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL2SUBJECT 6140MAY 1, 2009No Text on This PageMAY 1, 2009SUBJECT 61403CONTENTSINTRODUCTION1 Scope . .42 General . .42.1 Components . .42.2 Units of Measurement . .52.3 Undated References . .53 Special Components and Subassemblies of WTGS . .53.1 Wiring . .53.2 Cable drip loop . .63.3 Bus bars . .63.4 Switchgear . .83.5 Transformers . .83.6 Hub . .93.7 Converter/Inverter . .93.8 Lightning protection systems . .93.9 Slip rings . .93.10 Gearboxes . .103.11 Hoists and winches . .103.12 Fire alarms . .113.13 Emergency stop . .11CONSTRUCTIONWTGS AND SUBASSEMBLY4 General . .125 Disconnection Device . .126 Spacings . .137 Energy Storage Units . .147.1 General. .147.2 Battery mounting . .148 Working Space . .159 Safety Related Controls System (SRCS) . .169.1 General . .169.2 Protection functions . .169.3 Abnormal conditions for safety related controls system . .17APPENDIX AStandards for Components. A14SUBJECT 6140MAY 1, 2009INTRODUCTION1 Scope1.1 This Outline of Investigation covers Wind Turbine Generating Systems (WTGS) and electrical subassemblies. These units are intended for use in stand-alone (not grid-connected) or utility interactive applications. Utility-interactive WTGS are operated in parallel with an electric power system (EPS) to supply power to common loads.1.2 The WTGS power, control and protection systems are evaluated only to the extent that they function within the manufacturers specified limits and response times. These control and protection functions are evaluated with respect to risk of electric shock and fire. It is intended that the electrical subassemblies that address power transfer control and protection functions evaluated per this document are to be coordinated with the mechanical and structural evaluation of the WTGS in accordance with the IEC 61400 series documents or Germanischer Lloyd WindEnergie GMBH: Guideline for the Certification of Wind Turbines documents.1.3 This Outline of Investigation does not cover:a) WTGS intended for off-shore installation.b) Mechanical or structural integrity of the WTGS or subassemblies.c) Coordination of electrical and mechanical systems to maintain the WTGS within its safe mechanical and structural limits.d) Mechanical loading of ladders, scaffolding, personnel tie offs, or other personnel load bearing functional parts.1.4 The products, systems, and subassemblies covered by these requirements are intended to be installed in accordance with the National Electrical Code, ANSI/NFPA 70.2 General2.1 Components2.1.1 Except as indicated in 2.1.2, a component of a product covered by this Outline shall comply with the requirements for that component. See Appendix A for a list of standards covering components used in the products covered by this Outline. See also Section 3, Special Components and Subassemblies of WTGS.2.1.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in the product covered by this Outline, orb) Is superseded by a requirement in this Outline.MAY 1, 2009SUBJECT 614052.1.3 A component shall be used in accordance with its rating established for the intended conditions of use.2.1.4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.2.1.5 Components and subassemblies of the overall WTGS shall be evaluated and found suitable for operation over the normal range of electrical and environmental conditions as specified by the WTGS manufacturer.2.2 Units of Measurement2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information.2.3 Undated References2.3.1 Any undated reference to a code or standard appearing in the requirements of this Outline ofInvestigation shall be interpreted as referring to the latest edition of that code or standard.3 Special Components and Subassemblies of WTGS3.1 Wiring3.1.1 Internal wiring shall comply with the Standard for Industrial Control Equipment, UL 508, in addition to the requirements in this section.3.1.2 Wiring that is subject to movement, flexing, or twisting during operation of the wind turbine shall be investigated for suitability in the conditions of use and rated life or cycle time.3.1.3 All wiring within a WTGS that is large enough for service personnel to enter the structure shall be rated for tray cable usage. The following meet the intent of the requirement:a) Multiconductor cable complying with the Outline of Investigation for Flexible Motor SupplyCable and Wind Turbine Tray Cable, Subject 2277, and marked for Wind Turbine usage.b) Power-limited circuit cabling complying with the Standard for Power-Limited Circuit Cables, UL 13, suitable for Tray Cable usage (Types CMG, CM, CL2, CL3, PLTC, CMR, CL2R, CL3R, CMP, CL2P, CL3P).c) Optical fiber circuits complying with the Standard for Optical Fiber Cable, UL 1651.d) Power cabling complying with the Standard for Thermoplastic-Insulated Wires and Cables, UL 83, or the Standard for Thermoset-Insulated Wires and Cables, UL 44, and additionally marked for Cable Tray usage (“CT”, “For Cable Tray Use”, “For CT Use”, or “For Use in Cable Trays”) or marked FT4.Exception: Wiring within a component need only meet the requirements for the component.Note: For Canada, an FT4 rating is required per the Canadian Electrical Code.6SUBJECT 6140MAY 1, 20093.1.4 Wiring within a rotating hub shall be additionally protected from mechanical damage. Such protection may be provided by enclosures or conduit complying with the Standard for Metallic Outlet Boxes, UL 514A, and/or the Standard for Conduit, Tubing, and Cable Fittings, UL 514B, mechanical shielding, or the equivalent.3.1.5 Wiring subjected to exposure to water or oil during normal or abnormal conditions such as a gasket or seal leak shall be suitably rated for the condition.3.1.6 Wiring subjected to UV exposure shall be rated for exposure to sunlight.3.2 Cable drip loop3.2.1 If operation of the wind turbine may result in twisting of flexible cables, such as the connecting cables between rotating parts (nacelle) and parts of the fixed structure (tower or foundation), the operational conditions of use shall not cause damage to the conductors or their insulation. The evaluation shall address service life, electrical and environmental operating conditions of the subassembly.3.2.2 Controls that prevent damage to conductors or their insulation including rotational limits shall be considered part of the Safety Related Controls System evaluation of this document. The Control shall be designed such that resetting to the neutral position is possible. See Section 9, Safety Related Controls System (SRCS).3.3 Bus bars3.3.1 Sections of bus shall be suitably attached to the tower or to components of the tower intended to support the bus. The compliance of the attachment method shall be determined by subjecting a representative bus to Impact, Static Load, and Flexing tests.3.3.2 Bus shall be guarded or insulated to prevent unintentional contact in accordance with the following:a) Bus shall be metal enclosed at each work platform for a minimum of 8 feet above each platform.b) In areas other than work platforms, bus operating at 2500 V or more shall be metal enclosed.c) In areas other than work platforms, bus operating at less than 2500 V shall be metal enclosed, enclosed in a non-metallic enclosure complying with the Standard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C, or the conductors shall be protected by insulation and jacket that would be required of comparable tray cables specified by the Outline for Flexible Motor Supply Cable and Wind Turbine Tray Cable, Subject 2277, the Standard for Electrical Power and Control Tray Cables with Optional Optical-Fiber Members, UL1277, and the Standard for Thermoplastic-Insulated Wires and Cables, UL 83.3.3.3 Where cables are connected to bus assemblies, suitable wiring terminals shall be provided. Where the anticipated movement of the tower assembly causes movement of the cable or bus assembly, strain relief shall be provided to prevent movement of the connection.MAY 1, 2009SUBJECT 614073.3.4 Performance requirements shall be based on the Standard for Busways, UL 857, for bus rated 600V or less and on the Standard for Metal Enclosed Bus, IEEE C37.23, for bus rated more than 600 V. Performance testing shall include electrical and mechanical tests. See 3.3.5 and 3.3.6.3.3.5 The following electrical tests shall be conducted:a) Continuous Current (Heating),b) Dielectric Withstand (Applied Potential) for all voltage ratings, c) Impulse Withstand for bus rated more than 2.2kV,d) Short Circuit Withstand for bus assemblies rated up to 600V, ande) Momentary and Short-Time tests for bus assemblies rated greater than 600V.3.3.6 The mechanical tests specified in (a), (b), and (c) shall be conducted. The parameters for vibration and flexing tests are to be determined based on the amount of flexing transmitted to the bus assembly through movement of the wind turbine and tower under anticipated extreme conditions determined based upon the WTGS calculations in Wind turbines Part 1: Design requirements, IEC 61400-1.a) Impact Tests Ambient and cold impacts shall be conducted on the enclosure, housing or insulator as specified in the Standard for Busways, UL 857, or the Standard for Metal Enclosed Bus, IEEE C37.23, the Standard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C, or the Standard for Thermoplastic-Insulated Wires and Cables, UL 83,as applicable.b) Static Load Test The bus bar and the lower structural support shall be subjected to a force of 4 times the normal load of the fully assembled longest bus bar in the system. This test force shall include any additional weight of connection cables. Bus bar sidewall supports, guides and associated bracketry are to be subjected to a force of 4 times the maximum normal operating force encountered during tower movement. As a result of the loading test, there shall not be permanent deformation, breakage, dislocation, cracking or other damage to the system or mounting structure.c) Flexing Test The bus bar shall be subjected to a flexing test to simulate expecteddeflection and forces on bus bars and support structure over the wind turbine expected life in its intended installation location. The site class as designated by Section 6 of Wind turbines Part1: Design requirements, IEC 61400-1 shall be used to define and quantify this expected mechanical operating environment over time. The test excursion movements required for this test shall be 1.5 times the calculated movement of the bus bar system. Prior to the test, the bus bar assembly is to be subjected to loading on the top of the bus bar section to simulate the loading of the upper sections of bus bar, insulator and cables. Forces are to be cyclicallyapplied to the bus bar to represent movement of the actual tower. As a result of the loadingtest, there shall not be permanent deformation, breakage, dislocation, cracking or other damage to the system or mounting structure.Exception: Mechanical means to mitigate bus bar stress and force may preclude the need to perform a mechanical flexing test.8SUBJECT 6140MAY 1, 20093.3.7 The dielectric tests shall be performed following each of the above tests. Following the above tests, the bus bar insulators shall prevent accessibility to electrically live parts as determined by application of the accessibility probe.3.3.8 The leakage current test shall be performed following the above tests for polymeric enclosed bus bars.