BS-5000-40-1973.pdf

BRITISH STANDARD CONFIRMED AUGUST 1984 BS 5000-40: 1973 Incorporating Amendment Nos. 1 and 2 Specification for Rotating electrical machines of particular types or for particular applications Part 40: Motors for driving power station auxiliaries UDC 621.33 13:621.311.18 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40:1973 This British Standard, having been approved by the Electrical Industry Standards Committee, was published under the authority of the Executive Board on 13 November 1973 © BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ELE/1/1 Draft for comment 71/27747 ISBN 0 580 07984 8 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical CommitteeElectric Cable Makers Confederation Association of Consulting Engineers*Electrical Contractors Association Association of Manufacturers of DomesticElectrical Contractors Association of Scotland Electrical AppliancesElectrical Research Association* Association of Mining Electrical andElectricity Council, the Central Electricity Mechanical EngineersGenerating Board and the Area Boards in Association of Supervisory and ExecutiveEngland and Wales* Engineers*Electronic Engineering Association British Electrical and Allied ManufacturersEngineering Equipment Users Association* AssociationInstitution of Electrical Engineers British Electrotechnical Approvals Board forInstitution of Electrical and Electronics Household EquipmentTechnician Engineers British Radio Equipment ManufacturersLighting Industry Federation Limited AssociationMinistry of Defence British Railways Board*National Inspection Council for Electrical British Steel CorporationInstallation Contracting Crown Agents for Oversea Governments andNational Physical Laboratory (Department of AdministrationsTrade and Industry Department of Employment (HM FactoryOil Companies Materials Association* Inspectorate)Post Office Department of the Environment*South of Scotland Electricity Board* Department of Trade and Industry The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Electrical Machinery TradesLondon Transport Executive British Approvals Service for ElectricalMachines Tool Trades Association Equipment for Flammable AtmospheresMinistry of Defence (Army Department) British Internal Combustion EngineMinistry of Defence (Navy Department) Manufacturers AssociationNational Coal Board Engineer Surveyors AssociationPower Generation Association Lloyds Register of ShippingRotating Electrical Machines Association Amendments issued since publication Amd. No.Date of issueComments 2945July 1979 5771May 1989Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40:1973 © BSI 07-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2General1 3Types of environmental protection and classification of cooling methods1 4Duty and rating1 5Voltage variation during operation1 6Frequency variation during operation1 7Characteristics1 Appendix A Information to be given by the purchaser with enquiry and order2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40:1973 ii © BSI 07-1999 Foreword This British Standard has been prepared under the authority of the Electrical Industry Standards Committee at the request of the British Electrical and Allied Manufacturers Association. It forms a part of BS 5000 which, together with BS 4999, “General requirements for rotating electrical machines”, will eventually form a comprehensive series of British Standards for rotating electrical machines. A list of the contents of BS 5000 showing all the parts envisaged in the foreseeable future is given in the General Introduction and Index (published separately) which will be brought up to date as new parts are published. The contents of BS 4999 are given in a separate index and introduction to that standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40:1973 © BSI 07-19991 1 Scope This British Standard specifies the requirements, additional to those given in BS 5000-99, which are applicable to rotating electrical machines for driving power station auxiliaries such as circulating water pumps, boiler feed pumps, draught fans, pulverisers, etc., essential to the operation of the main generating units. This standard does not include motors which may be used for non-essential drives, such as ventilating fans, drainage pumps, cranes, etc., which do not normally differ from their counterparts in general industrial service. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 General In addition to the requirements specified in this standard, motors shall also comply with BS 5000-99. 3 Types of environmental protection and classification of cooling methods Machines for indoor use shag have an enclosure giving a degree of protection not less than IP 12 (see BS 4999-105). For use outdoors or in exposed conditions, weather protected machines should be used, and the conditions should be specified at the time of enquiry. NOTEIn dirty atmospheres or other adverse conditions a closed air circuit machine may be required which may be either air or water cooled, depending on the coolant most readily available. For such machines the collector enclosure may alternatively be filter-ventilated, when this is agreed between the manufacturer and the purchaser. 4 Duty and rating Machines shall be suitable for maximum continuous rating (MCR) or duty-type rating (DTR). NOTEAdjustable speed machines are normally rated at the highest and lowest speeds of the specified range; it is assumed that the load characteristic is such that one of these represents the most severe condition. Controllers used in conjunction with variable speed motors should be designed to match the motor ratings. 5 Voltage variation during operation Motors shall also be capable of supplying the starting and normal operating load requirements of the driven unit at 0.8 times the rated voltage for a time at least twice the normal starting time. D.C. motors intended for use from rectified a.c. supplies shall meet these requirements with the same variations on the a.c. supply to the rectifier. NOTEIf during starting conditions the supply voltage falls below 0.8 times the rated voltage and/or the total time at the reduced voltage exceeds twice the normal starting time, the relevant figures should be specified by the purchaser. 6 Frequency variation during operation Motors shall be capable of operating continuously at any frequency in the range 0.96 to 1.02 per unit (p.u.). Operation for short periods in an emergency shall also be possible at any frequency between 0.96 p.u. and 0.94 p.u. with voltage and load falling pro rata with the further drop in frequency below 0.96 p.u. When motors are required to operate under steady-state conditions with simultaneous variations of voltage and frequency, the permissible variations shall be as specified below. D.C. motors intended to operate from rectified a.c. supplies shall meet the above requirements assuming the same variations on the a.c. supply to the rectifier. 7 Characteristics 7.1 Starting performance of cage induction motors. Unless otherwise specified at the time of order, machines shall have characteristics as design N (see BS 4999-112) modified in accordance with the table given in 7.2 below. NOTEFor motors of large ratings (e.g. over 1 000 kilowatts) it may not be economical or justifiable to conform to this requirement and in such cases it is recommended that the motor starting torque characteristics are matched to those of the driven plant so that the accelerating torque at any speed is not less than 0.1 times the rated load torque when the supply voltage is reduced to 0.9 times the rated value. Such cases should be subject to agreement between the manufacturer and the purchaser. 7.2 Momentary excess torque Frequency (per unit)Steady-state voltage range (per unit) 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95 to 1.07 0.94 to 1.06 0.94 to 1.06 0.94 to 1.06 0.93 to 1.05 0.92 to 1.04 0.91 to 1.03 NOTEIntermediate values can be obtained by interpolation. Type of machineMomentary excess torque (per unit) A.C. induction motors of normal type D.C. motors Synchronous and synchronous induction motors 0.85 0.85 0.65 NOTEMomentary excess torque values apply at rated supply conditions. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40:1973 2 © BSI 07-1999 Appendix A Information to be given by the purchaser with enquiry and order The following additional particulars should be provided by the purchaser with enquiry and order: 1) Details of performance required during switching or fault conditions. 2) Information regarding any special operating conditions such as prolonged shutdown, special running or emergency conditions. 3) Details of any duplicate or stand-by devices. 4) Details of any special finish when a normal industrial finish is not acceptable. 5) Details of storage facilities available and of any special precautions necessary to prevent deterioration of or damage to motors intended to be stored after despatch from the manufacturers works. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40:1973 © BSI 07-1999 Publications referred to This standard makes reference to the following British Standards: BS 4999, General requirements for rotating electrical machines. BS 4999-105, Classification of degrees of protection provided by enclosures for rotaing machinery. BS 4999-112, Specification for starting performance of single-speed three-phase cage induction motors. BS 5000, Rotating electrical machines of particular types or for particular applications. BS 5000-99, Machines for miscellaneous applications. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:37:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5000-40: 1973 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. 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