IEC 60050-121:1998

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steam turbines - Part 1: SpecificationsTurbines à vapeur - Partie 1: SpécificationsSteam turbines - Part 1: Specifications27.040Plinske in parne turbine. Parni strojiGas and steam turbines. Steam enginesICS:Ta slovenski standard je istoveten z:IEC 60045-1SIST IEC 60045-1:2000en01-junij-2000SIST IEC 60045-1:2000SLOVENSKI
STANDARD
NORMEINTERNATIONALEINTERNATIONALSTANDARDCEIIEC45-1Première éditionFirst edition1991-05Turbines à vapeurPartie 1:SpécificationsSteam turbinesPart 1:Specifications© CEI 1991 Droits de reproduction réservés — Copyright — all rights reservedAucune partie de cette publkatbn ne pout être reproduite niutilisée sous quelque forme que ce soit et par aucun pro-cédé, électronique ou mécanique. y compris la photocopie etles microfilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized Inany form or by any means, electronic or mechanical,k>ckdkg photocopying and microfilm, without permissionIn writing from the publisher.Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève, SuisseIEC•Commission Electrotechnique InternationaleInternational Electrotechnical CommissionMeru ayHapoaiae 3nettrporemervecKaa I{oM rcorn•CODE PRIXPRICE CODEPRICE CODEPour prix, voir catalogue en vigueurFor price, see current catalogueSIST IEC 60045-1:2000

45-1 © IEC-3-CONTENTSPageFOREWORD . 5INTRODUCTION 7Clause1 Scope and object 92 Normative references 93 Terms and definitions 94 Guarantees
235 Governing (control)
256 Operation and maintenance
317 Components
398 Foundations and buildings
439 Feed pump drives
4510 Turbine auxiliary systems 4711 Instrumentation
5312 Protection
5513 Vibration
6314 Noise
6515 Tests
6516 Delivery and installation
6717 Design information to be supplied by the purchaser
6718 Design information to be provided by the supplier
7519 Turbine plant with regenerative feed water heating
77Annex A - Electronic governors 81SIST IEC 60045-1:2000

Six Months' RuleReport on Voting5(CO)285(CO)3145-1 © IEC- 5 -INTERNATIONAL ELECTROTECHNICAL COMMISSIONSTEAM TURBINESPart 1: SpecificationsFOREWORD1)The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees onwhich all the National Committees having a special interest therein are represented, express, as nearly aspossible, an international consensus of opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the NationalCommittees in that sense.3)In order to promote international unification, the IEC expresses the wish that all National Committeesshould adopt the text of the IEC recommendation for their national rules in so far as national conditions willpermit. Any divergence between the IEC recommendation and the corresponding national rules should, asfar as possible, be clearly indicated in the latter.This part of International Standard IEC 45 has been prepared by IEC TechnicalCommittee No. 5: Steam turbines.The text of this part is based on the following documents:Full information on the voting for the approval of this part can be found in the VotingReport indicated in the above table.Annex A forms an integral part of this part of IEC 45.SIST IEC 60045-1:2000

45-1©IEC- 7 -INTRODUCTIONThe first edition of IEC 45 was issued in 1931. Subsequent revisions were made, the lastbeing in 1970. Since then, intensive development has resulted in the availability of morehighly-rated turbines.The development of turbines suitable for use with water-cooled nuclear reactors has pro-ceeded in parallel, resulting in the production of large turbines for use with steam which isinitially dry-saturated or slightly wet.The demands made upon turbine control systems have increased simultaneously with thedevelopment of new control technologies, such as electro-hydraulic systems. Increasedreliability, higher standards of dynamic performance, suitability for two-shift operation, andincreased attention to health and safety are among the aspects now requiring highstandards of achievement.It has therefore become necessary to specify a turbine in more detail than was formerlyneeded. In consequence, this part of IEC 45 has been completely re-written, and is accor-dingly more comprehensive than earlier editions.Wherever practicable, this part of IEC 45 takes into account the scope for applying tosmaller turbines developments originally intended for larger machines, without implyingthat such applications would always be necessary or advantageous.SIST IEC 60045-1:2000

45-1 O IEC-9-STEAM TURBINESPart 1: Specifications1 Scope and objectThis part of International Standard IEC 45 is applicable primarily to steam turbines drivinggenerators for electrical power services. Some of its provisions are relevant to turbines forother applications.The purpose of this part is to make an intending purchaser aware of options and alterna-tives which he may wish to consider, and to enable him to state his technical requirementsclearly to potential suppliers.2 Normative referencesThe following standards contain provisions which, through reference in this text, constituteprovisions of this part. At the time of publication, the editions indicated were valid. Allstandards are subject to revision, and parties to agreements based on this part are encou-raged to investigate the possibility of applying the most recent editions of the standardsindicated below. Members of IEC and ISO maintain registers of currently valid Inter-national Standards.IEC 651: 1979, Sound level meters.IEC 953-1: 1990, Rules for steam turbine thermal acceptance tests - Part 1: Method A.IEC 953-2: 1990, Rules for steam turbine thermal acceptance tests - Part 2: Method B.ISO 2372: 1974, Mechanical vibration of machines with operating speeds from 10 to200 rev/s. Basis for specifying evaluation standards.ISO 7919-1: 1986, Mechanical vibration of non-reciprocating machines - Measurements onrotating shafts and evaluation - Part 1: General guidelines.3 Terms and definitionsFor the purposes of this part, the following terms and definitions apply:3.1 Turbine typesuperheat turbine: A turbine whose initial steam is significantly superheated.wet-steam turbine: A turbine whose initial steam is saturated or nearly so. (Also referredto as saturated-steam turbine.)reheat turbine: A turbine from which the steam is extracted part-way through theexpansion, reheated (one or more times) and readmitted to the turbine.SIST IEC 60045-1:2000

45-1 CD IEC- 11 -non-reheat turbine: A turbine in which the steam is not reheated.mixed-pressure turbine: A turbine provided with separate inlets for steam supplied at twoor more pressures.back-pressure turbine: A turbine whose exhaust heat will be used to provide processheat, and whose exhaust is not directly connected to a condenser. The exhaust pressurewill normally be above atmospheric pressure. (Also referred to as a non-condensingturbine.)condensing turbine: A turbine whose exhaust is directly connected to a condenser. Theexhaust pressure will normally be below atmospheric pressure.regenerative-cycle turbine: A turbine from which some of the steam is extracted part-waythrough the expansion in order to heat feed water.extraction turbine: A turbine in which some of the steam is extracted part-way through theexpansion in order to provide process steam. If the turbine includes means for controlling thepressure of the extracted steam, it is called a controlled (or automatic) extraction turbine.combined cycle: A combination of boiler, steam turbine and gas turbine, in which the gasturbine exhaust normally contributes to the heat input to the steam cycle.single-line combined-cycle: A combined-cycle plant in which the steam turbine and gasturbine both drive the same generator. It is not possible to segregate the separate outputsof the steam turbine and the gas turbine; and definitions, such as those of heat rate oroutput given later in this standard, no longer apply.NOTE - The terms in 3.1 may be combined to define the features of any particular unit.3.2 Methods of initial steam admissionfull-arc: All of the governing (control) valves supply steam uniformly to the admission inletbelt of the first stage.partial-arc: The inlet belt to the first stage is divided into discrete arcs of admission,steam being supplied separately to each arc through, normally, one governing valve;governing valves operate wholly or partially in sequence.3.3 Conditionsterminal conditions: The terminal conditions for a steam turbine or turbine-generator arethe conditions imposed on the plant at their terminating points of the contract. These maytypically comprise:-initial and hot reheat steam conditions;-cold reheat pressure;-final feed water temperature;-exhaust pressure;-power output;-speed;extraction requirements.SIST IEC 60045-1:2000

45-1 ©IEC- 13 -specified or rated terminal conditions: The conditions at the terminating points of theturbine or turbine-generator contract, with which specified output and/or heat rate shall bestated and/or guaranteed. Note that some nuclear steam generators supply steam at apressure which increases as load reduces, and the turbine design must allow for this.steam conditions: The conditions which define the thermodynamic state of steam,normally (static) pressure and temperature or dryness fraction (or quality). Steam pressureshould always be quoted in absolute units, not as gauge pressure.initial steam conditions: The steam conditions at inlet to the main stop valves.maximum steam conditions: The highest steam conditions at which the turbine is requi-red to operate continuously.NOTE - The highest steam conditions should not exceed those permitted by 6.2 a) and 6.2 b).induction steam conditions: The steam conditions of any additional steam entering theturbine at any pressure lower than the initial pressure.dual steam conditions: The combination of initial and induction steam conditions appro-priate to a mixed-pressure turbine.reheat steam conditions: The steam conditions at the inlet to the reheat stop valves.(Also referred to as hot reheat steam conditions.)cold reheat steam conditions: The steam conditions at the outlet of the turbine pre-ceding the reheater.extraction steam conditions: The steam conditions at the extraction connections of theturbine, of steam extracted for feed-heating or process purposes.exhaust conditions: The steam conditions at the exhaust connection from the turbine.NOTE - Use of the word "design" in respect of any steam conditions, power output, speed, etc., should beavoided in the contract documents. This terminology should only be applied to the values used in designcalculations such as the design pressure for a pressure vessel.3.4 Speedsrated speed: The speed at which the turbine is specified to operate at its rated output.maximum continuous speed: The upper limit of the operating speed of the turbine forcontinuous service.overspeed trip setting: The speed at which the overspeed trip is set to operate.SIST IEC 60045-1:2000

45-1 ©IEC- 15 -temporary speed rise: The transient increase in turbine speed following a load rejection,with the speed governing system in operation. The rated temporary speed rise applies ifthe rated output is rejected at the rated speed.maximum transient speed: Maximum rotational speed following rejection of maximumcapability by disconnecting the generator from the electric system (with auxiliary suppliespreviously disconnected) and the speed governing (control) system in operation.permanent speed rise: The final steady-state increase in turbine speed following a loadrejection, with normal governor control.maximum speed rise: The transient increase in turbine speed following a load rejection,with the speed governing system inoperative and the overspeed trip operative. The ratedmaximum speed rise applies if the rated output is rejected at rated speed.3.5 PowersNOTE - All these powers or outputs refer to operation of the turbine at rated terminal conditions (exceptwhere stated otherwise).power: The power supplied by the turbine or its driven machine. The definition shouldstate the position of measurement and any deductions for losses or auxiliary power. (Alsoreferred to as output or load.)net power at coupling: The power at the turbine coupling, less the power supplied toturbine auxiliaries if driven separately.generator output: Power at the generator terminals, after the deduction of any externalexcitation power.maximum continuous rating (MCR). (electrical generating set): The power outputassigned to the turbine-generator by the supplier, at which the unit may be operated for anunlimited time, not exceeding the specified life, at the specified terminal conditions. This isthe rating which will normally carry a guarantee of heat rate. The governing (control)valves will not necessarily be fully open. (Also referred to as rated output, rated power, orrated load.)maximum continuous rating (MCR) (other than electrical generator drives): Thepower output assigned to the turbine by the supplier, at which the unit may be operated foran unlimited time, not exceeding the specified life, at the specified terminal conditions.This is the rating which will normally carry a guarantee of heat rate. The governing(control) valves will not necessarily be fully open. The power shall be that delivered at theturbine coupling, or the coupling of the driven machine, as may be agreed. (Also referredto as rated output, rated power, or rated load.)maximum capability: The power output that the turbine can produce with the governing(control) valves fully open and at the specified terminal conditions. (Also referred to asvalves-wide-open capability.)maximum overload capability: The maximum power output that the unit can produce withthe governing (control) valves fully open, and with the terminal conditions specified for over-toad, e.g. with final feed water heater bypassed, or with increased initial steam pressure.SIST IEC 60045-1:2000

45-1 ©IEC- 17 -most economical continuous rating (ECR): The output at which the minimum heat rateor steam rate is achieved at the specified terminal conditions.net electrical power: The generator output (with external excitation power deducted)minus the electrical auxiliary power.electrical auxiliary power: Power taken by turbine and generator auxiliaries not driven bythe turbine. This will normally include all power used for control, lubrication, generatorcooling and sealing. It may also include additional auxiliaries such as motor-driven boilerfeed pumps. The purchaser and contractor should agree on which additional auxiliariesshould be included.3.6 Steam flow rate and steam rateinitial steam flow rate: The flow rate of steam at initial conditions to the turbine, includingany steam supplied to valve stems, glands, or balance pistons, and any steam su
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