EN 61064-1993 en Acceptance Tests for Steam Turbine Speed Control Systems《汽轮机转速控制系统验收试验(IEC 1064-1991)》.pdf

1、= 3404583 0063325 007 EUROPEAN STANDARD EN 61064 NORME EUROPENNE EUROPISCHE NORM February 1993 UDC 621.165-531.6 : 621.3 : 620.1 Descriptors: Steam turbine, control system, speed, overspeed protection, acceptance test English version Acceptance tests for steam turbine speed control systems (IEC 1064

2、 : 1991) Essais de rception des sytmes de rgulation de vitesse des turbines vapeur (CE1 1064 : 1991) Abnahmeprfungen fr Dampfturbinen-Regelsysteme (IEC 1064 : 1991) This European Standard was approved by CENELEC on 1992-12-09. CENELEC members are bound to comply with the CENKENELEC Internal Regulati

3、ons which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This E

4、uropean Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members a

5、re the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen

6、 de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1993 Copyright reserved to CENELEC members Ref. No. EN 61064 : 1993 E D 3g04583 0063326 T43 Page 2 EN 61064 : 1993 Foreword The CENELEC questionnaire procedu

7、re, performed for finding out whether or not the International Standard IEC 1064 : 1991 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as European Standard. The reference document was submitted to the CENELEC members for formal vot

8、e and was approved by CENELEC as EN 61064 on 9 December 1992. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1993-12-01 - latest date of withdrawal of conflicting national standards (dow) 1993-12-01 For products which have complied with the relev

9、ant national standard before 1993-12-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 1998-12-01. Annexes designated normative are part of the body of the standard. In this standard, annexes A and ZA are normative. = 34045

10、83 0063127 98T Page 3 EN 61064 : 1993 CONTENTS 1 Scope and object 5 2 Normative reference 5 3 Terms. symbols. definitions and units 6 4 Guiding principles . 8 4.1 Matters on Midi agreement shall be reached 8 4.2 Time of carrying out tests . 9 4.4 Instniments 10 4.3 Preparation for acceptance tests .

11、 10 4.5 Test report . 11 5 Speed governing system tests 11 . 5.1 Turbine at standstill 11 5.2 Turbine at no-load . ”. 1 1 5.2.1 Overview . 11 5.2.2 Test procedure for determination of static characteristics 12 5.2.3 Determination of dead band 13 52.4 Speed range determination . 13 5.2.5 Stabiiiy . 1

12、3 5.3 Turbine on load 13 5.3.1 Overview . 5.3.2 Test conditions 5.3.3 Load-steam flow demand relationship . 5.3.4 Dead band determination - Overview 5.3.5 Dead band determination - Method 1 5.3.6 Dead band determination - Method 2 5.3.7 Detemination of steady-state speed regulation - Method 1 5.3.8

13、Determination of steady-state speed regulation - Method 2 5.3.9 Determination of incremental speed regulation - Method 1 . 5.3.10 Determination of incremental speed regulation . Method 2 . 5.3.1 1 Stability . 13 14 14 15 15 16 16 17 17 18 18 Page 4 EN 61064 : 1993 clame = 3404583 O063328 8Lb 5.4 Dyn

14、amktests ofthespeed govemingsystm by sudden load mjecon to no-load . 18 5.4.1 oniiw 18 5.4.2 Operang conditions . 18 5.4.3 Testproaedre . 19 5.4.4 Test results . 20 5.4.5 stabmy 20 6 Overspeed protectiOn systm tests . . . . 20 20 6.1 6.2 Turbine at no-load . “-n.“n-.n.- 20 6.3 TurMne on load . “. .

15、21 6.4 Dynamic testing of overspeed protecaon system by turbine Mp from maximum 21 load . . . . . TurMne at standstill “ “ . . 6.4.1 Ovendew .- 21 21 6.4.3 Test procedure . 21 21 6.42 Operating OOndMOIIS . 6.4.4 Test mutts . . .!. . 23 Annex A - 0-d guidm . . Figures . 26 = 3404583 0063127 752 Page

16、5 EN 61064 : 1993 ACCEPTANCE TESTS FOR STEAM TURBINE SPEED CONTROL SYSTEMS 1 Scope and object This Intemational Standard applies primarily to constant-speed steam turbines driving a.c. generators at power stations, for testing speed control systems consisting of speed governing and overspeed protect

17、ion systems. It may also be used, where appropriate, for other types of steam turbines. The purpose of acceptance tests of steam-turbine speed governing and overspeed protec- tion systems is to verify any criteria quoted in the manufacturers guarantees. Such tests will generally be carried out to ch

18、eck compliance with IEC 45-1. The criteria may Include: a) steady-state speed regulation (speed governing droop); b) steady-state incremental speed regulation (incremental speed governing droop); c) range of speed at no-load corresponding to the extreme settings of the speed changer; d) dead band of

19、 the speed governing system; e) stability of the speed governlng system; f) maximum transient increase of speed following full load rejection and any partial load rejections, with the speed governing system in operation; g) overspeed trip setting; h) maximum transient overspeed following full load r

20、ejection on the failure of the speed governing system. Selection of the tests to be carried out and procedures for other tests not covered by this specification shall be agreed upon between the manufacturer and the purchaser. 2 Normative reference The following standard contains provisions which, th

21、rough reference in thls text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of appl

22、ying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 45: 1991, Steam turbines. Part I: Specifications. = 3q04583 O063330 U79 M Page 6 EN 61064 : 1993 3 Terms, symbols, deflnltlons and units Using these

23、 rules it is recommended to employ the symbols, definitions and units that are given in tables 1 and 2 and in figure 1. Table 1 lists basic terms, symbols, and units, while Table 2 presents terms, symbols, definitions, and units of parameters specific to this standard. IEC 45-1 definitions are also

24、applicable. No. 1 2 3 4 b 6 7 8 9 10 11 12 13 Table 1 lm L P e QD n U 1 S h X T t Y unit = 3404583 0063131 300 = Page 7 EN 61064 : 1993 - No. 1 2 3 4 5 16 7 8 9 10 - Temi Maximum controlled speed at ndoad Maximum speed tise Meximum transient speed Maximun transient owspeed Maximum capabilay Table 2

25、The speed at which thetubhe is specified to aperate atitsratedoutpf Thespeedatnakad cormpod tothe bwer sett*ig ofthespeedchanger The maximum rotatknal speed fdlowirig r+ 2) provision of access to the necessary measuring points on the turbine, generator and control system; 3) time allowed for install

26、ing, pretesting and disassembly of the test instrumen- tation; 4) tests to be carried out at the manufacturers works and at the power plant; 5) provision of necessary additional personnel and definition of their duties; 6) liability in case of accidents, loss or damage to equipment and Instruments;

27、7) liabllity for any damage due to testing of the turbine, generator or control system; 8) liability for any possible Interruption of turbine service beyond that necessary to carry out the test; 9) insurance against any uncovered risk; 10) costs of equipment and manpower. 4.2 Time of carrying out te

28、sts a) Any necessary adjustments to the speed governing and overspeed protection systems shall be completed before performing acceptance tests. Page 10 EN 61064 : 1993 b) Acceptance tests of the overspeed protection system at no load shall be carried out as soon as the turbine is put into operation

29、after installation. c) All other agreed to acceptance tests shall be carried out within the period agreed between the purchaser and the manufacturer but not later than the end of the warranty period. 4.3 Preparation for acceptance tests a) The test program shall be prepared by the parties to the tes

30、ts. The program shall include a list of the tests to be carried out, the responsibilities of the parties, the oper- ational conditions and test modes, instructions for the test personnel, safety measures and test procedures. b) Before undertaking the tests, the lists and calibration curves for all i

31、nstrument readings used during the tests should be compiled and checked. c) Any special Instruments not supplied for normal operation that are necessary for carrying out the tests shall be mounted on the unit. d) When the parties concerned agree to perform tests on the turbine at standstill, the nec

32、essary simulation equipment shall be installed. 4.4 Instruments a) The instruments used shall have the requisite akuracy and response character- istics to meet the test parameters and dynamic characteristics of the test processes. In determining the dead band it is necessary to record the speed of t

33、he unit by means of a device having an accuracy of M,02 % and a dead band less than 10 % of the dead band being measured. Also, the displacement of the sewomotor and steam valves, and the change of the steam flow demand shall be measured with an accuracy of I0,5 % of the displacement or change which

34、 corresponds to the load change from no-load to ra- ted load. A precise frequency meter with a measurement accuracy of f0,l % of the speed of the unit shall be used. Also, the values of the steam flow demand, the displacement of the main servomotor and the power at the generator terminals (measured

35、or calculated) shall be obtained with an accuracy of Il %. The measurement accuracy of the par- ameters used for converting the measured generator power to rated conditions (steam pressure and temperature upstream and within the turbine, steam flow, etc.) shall be adequate to obtain the above-mentio

36、ned accuracy. b) When carrying out dynamic tests of the speed governing and overspeed protection systems, the pertinent values shall be recorded by fast recording instruments. The recording instruments cut-off frequency and chart speed should be suitable to obtain the required accuracy of the measur

37、ed variables. For example, the speed measurement accuracy shall be f0,l % for the load rejection test and overspeed protection test at no-load. c) It is preferable to carry out test measurements with special test instruments. If this Is not practicable or convenient, the normal station operational i

38、nstruments may be cali- brated and used. if they are used, it is necessary to reach an agreement about the tolerances for the test results. W 3404583 0063335 T5b W Page 11 EN 61064 : 1993 4.5 Test report After completion of the acceptance tests, the test report shall be prepared including the test r

39、esults. Unless otherwise agreed between the parties, the report shall include the follo- wing items: a) object and scope; b) agreements between the test parties; c) test program; d) list of measurement points and instruments used, with information about their accuracy and other characteristics; e) p

40、lots and tables of calibration and correction factors for the readings of test instru- ments; f) test measurements in tabular, graphical or chart form; g) results of the correction of test measurements to the specified conditions, if the test conditions differ from those specified: h) calculations o

41、f the speed governing and overspeed protection systems charac- teristics, and their comparison with specifications and contractual requirements; i) conclusions about the state of the speed governing and overspeed protection systems, and appropriate recommendations. The test report shall be signed by

42、 those persons directing the tests and confirmed by the parties to the contract. 5 Speed governing system tests Tests are carried out with three different operating conditions of the turbine: a) turbine at standstill; b) turbine at no-load; c) turbine on load. 5.1 Turbine at standstill The tests on

43、the turbine at standstill demonstrate in advance whether the speed governing system is in its proper state, and allow for checking all the instruments and training the operating staff. With the exception of the test for obtaining the servomotor stiffness charac- teristic, all tests are for informati

44、on only and should not be considered as acceptance tests. The servomotor stiffness characteristic is required for measuring the dead band by the method described in 5.3.5. The test procedure is described in A.l of annex A. 5.2 Turbine at no-load 5.2.1 Overview Tests are carried out with the generato

45、r disconnected from the network, and with the tur- bine speed and parameters set as listed subsequently. 3404583 0063lt36 992 Page 12 EN 61064 : 1993 Tests are carried oui to determine: a) the dependence of the steam flow demand and valve position on changes in the controlled parameters; b) the dead

46、 band of the speed governor; c) the dead band of the speed governing system with negligible or minimum steam for- ces on the control valves; d) the range of speed corresponding to the extreme settings of the speed changer; e) stability. 5.2.2 Test procedure for determination of static characteristic

47、s a) All parameters, which in changing their values may affect the test results, should be stabilized as closely as possible prior to the test. This condition should be maintained during the whole test with the accuracy defined by the equipment specifications or by the appropriate manuals. Possible

48、acceptable deviations from the specified values are to be agreed by the parties prior to the tests. b) Determination of the dependence of both the steam flow demand signal (for example, fluid control pressure) and the control valve position (or the position of the main servomotor actuating the valve

49、) upon controlled parameter changes is carried out for three settings of the speed changer corresponding: I 1) to turbine no-load at rated speed; 2) to turbine no-load at an increased speed between 1 ,O3 no and 1 ,O5 no; 3) to turbine no-load at a decreased speed between 0,96 no and 0,98 no. c) When determining the static characteristics of the speed governing system at turbine no-load, the rated speed no is initially set by adjusting the speed changer and then, without changing this setting, the turbine steam flow is slowly decreased by one of the methods