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Basic dataStandard ID: DL/T 711-2019 (DL/T711-2019)Description (Translated English): (Turbine regulation security system test guidelines) Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: K54 Word Count Estimation: 25,237 Date of Issue: 2019-06-04 Date of Implementation: 2019-10-01 Older Standard (superseded by this standard): DL/T 711-1999 Regulation (derived from): Natural Resources Department Announcement No. 7 of 2019 Issuing agency(ies): National Energy Administration DL/T 711-2019: (Turbine regulation security system test guidelines)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Test guide of steam turbine governing system DL/T 996-2019 ICS 27.100 K 54 People's Republic of China Electric Power Industry Standard Replace DL/T 711-1999 Test Guidelines for Steam Turbine Regulating and Security System 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration Table of contents1 Scope...1 2 Normative references...1 3 Terms, definitions, and symbols... Error Undefined bookmark. 4 Basic requirements...4 5 Test preparation...6 6 Static test of adjustment system...7 7 Dynamic test of adjustment system...10 8 Load rejection test...12 9 Participation of the regulation system in the grid-related test...19 10 Preparation of test report...20 Appendix A (Normative Appendix) Correction method of dynamometer load rejection test results...22 Appendix B (informative appendix) Characteristics of conventional method and dynamometer load rejection test method...23ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation". Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This standard replaces DL/T 711-1999 "Guidelines for the Test of Steam Turbine Regulating and Control System", and is compared with DL/T 711-1999 except for editorial changes The main technical changes are as follows. a) The reference standard of the original standard has been updated; b) Some terms and definitions of the original standard have been updated; c) Deleted part of the specifications and requirements of the original standard for the pure hydraulic adjustment security system; d) Deleted the original standard test method for the pure hydraulic regulation security system; e) Added DEH simulation test when the unit is static; f) Added a new frequency modulation test; g) Added the actual measurement and modeling test of the adjustment system parameters. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Power Plant Steam Turbine Standardization Technical Committee. The revision unit of this standard. Xi'an Thermal Power Research Institute Co., Ltd. The main revision of this standard. Zhang Yafu, Chen Kun and Wang Tao. The time when this standard was first issued..1999.This standard is the first revision. This standard replaces DL/T 711-1999 from the date of implementation. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing) No. 1, 100761). Test Guidelines for Steam Turbine Regulating and Security System1 ScopeThis standard specifies the performance standards and test methods that should be met by the steam turbine regulating and security system. This standard is applicable to the acceptance test of the electro-hydraulic regulating system of steam turbines driving generators in thermal power plants. For electro-hydraulic control system The related parts can be used as reference after transformation and industrial steam turbine.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB 2900.46 Electrical Terms Steam Turbine and Auxiliary Equipment GB/T 7596 Mineral turbine oil quality in power plant operation GB/T 22198 Steam Turbine Speed Control System Acceptance Test GB/T 30370 Primary Frequency Modulation Test and Performance Acceptance Guide for Thermal Power Generating Set DL/T 701 Terminology of Thermal Power Plant Automation DL/T 824 Guidelines for Performance Acceptance of Steam Turbine Electro-hydraulic Control System DL/T 892 Technical conditions of power station steam turbine DL/T 1235 Synchronous generator prime mover and its regulation system parameter measurement and modeling guide DL/T 1270 Unit load rejection test guidelines for thermal power generation construction projects DL 5190.3 Technical Specification for Power Construction Construction Part 3.Steam Turbine Generator Set 3 Terms, definitions and symbols 3.1 The terms not listed in this standard shall meet the requirements of the national standard GB/T 2900.46. 3.2 The definitions of some professional terms in this standard refer to the provisions of DL/T 701 and DL/T 892. 3.3 The basic names, symbols and units are listed in Table 1. 3.4 The professional names and definitions are listed in Table 2. 4 Rated speed n0 The designed operating speed of the steam turbine under rated load Hz, r/min5 Temporary speed rise4.5 Maximum instantaneous speed nmax After the load rejection of the steam turbine generator set, the maximum instantaneous speed nmax of the steam turbine under the control of the regulating system shall not cause the emergency protector to operate. 4.6 Critical overspeed maximum speed nw,max After the steam turbine loses load under the condition of uncontrollable regulation system, its critical overspeed maximum speed nw,max shall not be greater than the rated speed 18%. The steam turbine rotor should be subjected to overspeed test in the manufacturer. The test speed should exceed 2% of the maximum calculated speed for critical overspeed. When only limited by the emergency interrupting device, the maximum test speed shall not exceed 20% of the rated speed. 4.7 Overspeed protection system 4.7.1 When the overspeed protection control (OPC) is activated, the regulating steam valve is quickly closed, the unit does not trip, and its operating speed is generally the rated speed 103%. 4.7.2 When the electric overspeed protection is activated, the unit trips, and the electric overspeed action speed is generally 110% of the rated speed. Electric overspeed generally set DEH Electric overspeed, TSI electric overspeed or tachometer card electric overspeed have the same action value, and each channel should be tested separately. 4.7.3 When the mechanical overspeed protection is activated, the fly hammer or flying ring is hit, the unit trips, and the mechanical overspeed action speed is generally the rated speed 110%±1%. The reset speed should be higher than the rated speed. 4.7.4 When the additional overspeed protection action unit trips, the action speed should be 1% to 2% higher than the emergency protector action speed, and the maximum should not be greater than the rated speed. 114% of the speed.. 4.8 Steam valve closing time The recommended value of the total closing time t of the main steam valve, the regulating steam valve and the auxiliary steam valve is shown in Table 6 (the closing time of the auxiliary steam valve and the closing time of the regulating steam valve are required Seek agreement). 4.2.8 Closing time of the extraction check valve The total closing time of the extraction check valve directly connected to the steam turbine cylinder should be less than 1s.5 Test preparation5.1 Drawing up a test plan and organizing division of labor 5.1.1 Draw up a test plan and write a test outline, which includes. test purpose, test items, test methods, test procedures, test Conditions, precautions, safety measures and schedule. 5.1.2 Establish a test leading group, the test process is directed by one person, unified actions, clear division of labor, specific tasks, and strict positions Bright. 5.1.3 All parties participating in the assessment and acceptance test shall reach an agreement on the test methods, standards and accuracy of instruments and meters. For imported units Test methods and standards other than this method can also be used. 5.1.4 All parties participating in the test should clarify their responsibilities and jointly formulate the test program and test report. 5.2 Instruments and meters 5.2.1 The accuracy, frequency response and recording speed of recording (automatic recording) instruments and meters used in the test should meet the requirements of the measured object Requirements. It is best to use special instruments and meters. 5.2.2 The monitoring (manual record) instrument used in the test may be a routine running meter that has passed the verification. 5.2.3 When carrying out the static characteristic test of the steam turbine governing system and the security system test, the measured variables and the accuracy of the instruments used are listed in Table 7. 5.2.4 When conducting the dynamic characteristic test of the steam turbine regulating system, the measured variables and the accuracy of the instruments used are listed in Table 8. 5.2.5 For the electro-hydraulic control system of a steam turbine larger than.200MW, when measuring the slow rate, the speed measurement accuracy should be ±0.02%, and the dead zone should be Less than 10% of the actual system slowness rate. The accuracy of the stroke measurement of the oil motor and the regulating steam valve should be ±0.5%. 5.2.6 Before conducting the test, install the special instruments and meters required for the test on the test unit. 5.2.7 Before the test, the number of instruments and meters used shall be recorded and recorded. 5.2.8 Before conducting the test, draw a table and correction curve for recording the measured variables.6 Static test of adjustment system6.1 Steam turbine valve opening and closing test and stroke (or oil motor stroke) measurement 6.1.1 Test conditions 6.1.1.1 When the steam turbine is at a standstill or cranking, the adjustment system is installed and adjusted, the oil quality meets the requirements of GB/T 7596, and the oil is controlled. Pressure and oil temperature are within the required range. The steam turbine has the conditions for hanging brakes. 6.1.1.2 The valve should be opened slowly and gradually during the first opening and closing test to prevent damage to the positioning rod and LVDT feedback rod. 6.1.2 Test method 6.1.2.1 Mark the position of each valve in the fully closed position before hooking up the steam turbine. 6.1.2.2 Hang the steam turbine brake, and slowly open (close) each steam valve in turn. During the opening (closing) process, the valve should be free from jamming, jumping or obstruction. Block and other issues. 6.1.2.3 Open each steam valve in turn and measure the valve stroke. For those that cannot directly measure the valve stroke, measure the stroke of the oil motor and record Maximum stroke of each valve. 6.1.2.4 Compare the test data with the manufacturer's instructions. The error should be less than ±1mm. If the deviation is too large, the cause should be found out. 6.2 Measurement of steam turbine valve closing time 6.2.1 Test conditions 6.2.1.1 In order to prevent the speed of the steam turbine from soaring beyond the critical interruption speed under the conditions of load rejection or out-of-control of the regulating system, the main steam valve and regulating system The total closing time of the throttle valve must meet the requirements. Under conditions, the closing time test of the extraction check valve must be carried out. 6.2.1.2 The steam turbine is at a standstill, the DEH static debugging has been qualified, the LVDT or switch quantity feedback indication of each valve is accurate, and the oil quality meets According to the requirements of GB/T 7596, control the oil pressure and oil temperature within the required range, and the steam turbine has the condition of hanging brake. 6.2.2 Test method 6.2.2.1 The measured steam valve should be in the fully open position, use the hard hand-operated button to trip the steam turbine, and record the time from issuing a trip command to fully closing the valve Close the whole process time. 6.2.2.2 During the valve closing time measurement process, the stop signal should be connected to the manual stop button of the console. 6.2.2.3 Record the delay time 1t from the time the trip command is issued to the start of the valve action, and the time 2t from the start of the valve action to the complete closing, and Calculate the total closing time of the valve 21 ttt =. The delay time is best to be measured multiple times and the average value is taken. The total closing time of the valve should conform to Table 3 Requirements. 6.3 Measurement of the action time from generator grid-connected switch trip to OPC 6.3.1 Test conditions The steam turbine is in a static state, the static debugging of each valve has been completed, the oil quality meets the requirements of GB/T 7596, and the oil pressure and oil pressure are controlled. If the temperature is within the required range, the steam turbine has the conditions for hanging brakes. 6.3.2 Test method 6.3.2.1 Disconnect the soft connection of the generator outlet, hook the steam turbine, and close the generator outlet switch. 6.3.2.2 Manually trip the motor outlet switch and record the time from the trip of the generator outlet switch to the OPC action, which should be less than.200ms. 6.4 DEH simulation test 6.4.1 Test conditions The steam turbine is in a static state, the static debugging of each valve has been completed, the oil quality meets the requirements of GB/T 7596, and the oil pressure and oil pressure are controlled. If the temperature is within the required range, the steam turbine has the conditions for hanging brakes. 6.4.2 Test method 6.4.2.1 Hang the brake of the steam turbine and use the DEH simulation program to carry out the DEH simulation test. 6.4.2.2 When the steam turbine is running, check that the valve opening sequence is correct. 6.4.2.3 Simulate the speed-up process of the steam turbine and check whether the valve action is correct and whether the speed-up rate automatically changes to the program automatic setting value when the threshold is exceeded The valve control switching process is normal, and the turbine speed rises to the rated speed. 6.4.2.4 Carry out the tightness test of the main valve and governor valve, and the inspection procedure is correct. 6.4.2.5 Carry out steam turbine OPC, electrical overspeed and mechanical overspeed tests, and the inspection procedures are correct. 6.4.2.6 The steam turbine generator is connected to the grid by simulating, and carrying out the rising (falling) load test and the valve movement test to verify that each circuit is normal. 6.4.2.7 During the DEH simulation test, each valve of the main engine should be operated in real, and the DEH logic should not be checked only. During the simulation test, someone should be sent Monitor the valve action on the spot and prevent personal injury and equipment damage. And check the function of the mechanical part of the regulating system during the simulation process Should meet the normal operation requirements of the unit. 6.4.2.8 After the simulation test is completed, the steam turbine trips. 6.5 ETS protection test 6.5.1 Test conditions The steam turbine is at a standstill, and the DEH static debugging work has been completed. The electrical extraction valves, check valves, and steam traps in the steam pipelines have moved Operation is normal, and the steam turbine has the conditions for hanging brakes. 6.5.2 Test method 6.5.2.1 Hanging brake of steam turbine. 6.5.2.2 Open each steam turbine valve, each electric steam extraction valve, check valve, and each trap as appropriate. 6.5.2.3 Trigger the steam turbine trip conditions one by one, check the steam turbine trip, the correct action of each valve, and the correct ETS first-out indication. 6.6 Determination of the maximum speed of critical overspeed 6.6.1 Calculation method of critical overspeed maximum speed 6.6.1.1 Calculation formula 6.6.1.2 Method of parameter determination 6.6.2 Test method for critical overspeed maximum speed 6.6.2.1 Adopt indirect test method-dynamometer method (for the test method, please refer to 8.2 dynamometer load rejection test). This method is not In the case of disconnecting from the grid, quickly close the high and medium pressure main steam valves, and perform energy conversion calculations based on the measured active power change process Get the maximum speed for critical overspeed. 6.6.2.2 When the delay and closing time of the main steam valve is less than the extension and closing time of the regulating steam valve, and the duct of the main steam valve is short, or the unit When it is impossible to close only the main steam valve, the method of closing the main steam valve and the regulating steam valve at the same time can also be used. 6.6.2.3 The calculation formula is as follows. 6.6.2.4 The speed of the calculation result of the test is too high, so it is generally not processed, and corrected if necessary (see Appendix A for the correction method).7 Dynamic test of adjustment system7.1 Turbine rotation 7.1.1 When the steam turbine speeds up for the first time, check that the speed control of the regulating system should be reliable and stable. 7.1.2 Before the first speed increase of the steam turbine, the DEH control speed, protection speed and local speed should be calibrated to indicate accurately; During the process, check the speed again to prevent damage to the steam turbine caused by the inaccurate speed of the steam turbine. 7.1.3 During the speed increase process, confirm that the critical speed zone setting should be consistent with the actual measured critical speed zone, otherwise the critical speed set by DEH should be modified Zone to keep it consistent with reality. 7.1.4 During the switching process of the valve control mode, the speed should remain stable, and there should be no large fluctuations or even out-of-control speed. 7.1.5 After the speed of the steam turbine is fixed, the speed of the steam turbine should be stable. 7.2 Steam valve tightness test 7.2.1 In order to avoid the excessive rise of the speed of the steam turbine generator set in the process of sudden load rejection or emergency shutdown, and the ability to To effectively control the speed, the tightness of the high and medium pressure main steam valve and the high and medium pressure regulating steam valve must meet the requirements. 7.2.2 The test is carried out under the no-load state of the steam turbine. Steam parameters and vacuum should be kept as rated as possible. Main (reheat) steam pressure The minimum must not be less than 50% of the rated pressure. After the main steam valve or the regulating steam valve is closed, the speed of the steam turbine should be able to drop to the value calculated in equation (10). 7.2.3 For the maximum steam leakage of the valve of the medium-pressure unit, it should not affect the rotor to slow down to standstill. For main steam pressure of 9MPa or For the above units, the maximum steam leakage of the valve will not affect the rotor speed to less than 1000r/min. 7.2.4 Each type of valve is required to be tested separately. At the rated speed, the regulating steam valve (or main steam valve) is fully open, and the main steam valve is quickly closed. Steam valve (or regulating steam valve), record the speed reduction process time and the lowest stable speed. 7.2.5 The tightness test of the steam valve can also be carried out according to the method and standard provided by the manufacturer. 7.2.6 During the te......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of DL/T 711-2019_English be delivered?Answer: Upon your order, we will start to translate DL/T 711-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of DL/T 711-2019_English with my colleagues?Answer: Yes. The purchased PDF of DL/T 711-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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