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DL/T 711-2019: (Turbine regulation security system test guidelines)
Status: Valid DL/T 711: Evolution and historical versions
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Test guide of steam turbine governing system
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Basic data | Standard 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Count Estimation | 25,237 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Older Standard (superseded by this standard) | DL/T 711-1999 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National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 contents
1 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...23
Foreword
This 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 System
1 Scope
This 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 references
The 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/min
5 Temporary speed rise
4.5 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 preparation
5.1 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 system
6.1 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 system
7.1 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 test, attention should be paid to the steam turbine differential expansion, axial displacement, unit vibration and cylinder temperature changes.
7.2.7 During the test, care should be taken to keep the boiler steam pressure, steam temperature and condenser vacuum parameters stable.
7.3 Overspeed test
7.3.1 Test conditions
7.3.1.1 The tightness of each steam valve has passed the test.
7.3.1.2 The steam turbine maintains stable operation at the rated speed, and the main steam parameters and vacuum are within the specified range and remain stable.
7.3.1.3 If the steam turbine is started in cold state, it should also run normally when the unit is turned on and the continuous operation time with 25%~30% rated load is greater than 4
Test after hours (or follow the manufacturer's instructions).
7.3.1.4 Before the test, it should be observed that the cylinder temperature, the temperature difference between the upper and lower cylinders, the expansion difference between the rotor and the cylinder, and bearing vibration are within the normal range. no
Then, no overspeed test is allowed.
7.3.2 OPC overspeed test
Increase the speed of the steam turbine to 103% of the rated speed, check that the OPC command is issued, the OPC solenoid valve should operate correctly, and the speed control valves
It is quickly closed, and after the speed of the steam turbine drops, the governor steam valve opens again to maintain the speed of the steam turbine at the rated speed.
7.3.3 Electric overspeed test
The electrical overspeed test includes DEH electrical overspeed, TSI electrical overspeed, tachometer card electrical overspeed, etc., which should be completed item by item. When conducting a certain test,
Other items of electric overspeed protection should be shielded, and the action value of electric overspeed protection can also be changed to a lower speed, and then restored to the original value after the test is over.
Increase the speed of the steam turbine to the electric overspeed action speed, check that the steam turbine should trip, and the ETS first output indication is correct.
7.3.4 Mechanical overspeed test
7.3.4.1 Before the mechanical overspeed test, the oil filling test of the emergency interrupting device should be carried out and the normal operation should be confirmed. Otherwise mechanical
Speeding test.
7.3.4.2 Select "Mechanical Overspeed Test" on the DEH operation screen to perform mechanical overspeed test.
7.3.4.3 The process of increasing the speed shall be steady and slow, and the rate of increase shall not exceed 100r/min.
7.3.4.4 Record the operating speed of the emergency interrupting device.
7.3.4.5 Each emergency interrupting device shall be subjected to two repeatability tests, and the difference in operating speed between the two tests shall be less than 0.6% of the rated speed. Crash
When the unit is a newly commissioned unit, three repeatability tests should be carried out, and the difference between the operating speed of the third test and the average value of the previous two operating speeds should not exceed
1% of rated speed.
7.3.4.5 During the test, the speed of the steam turbine, unit vibration, and axial displacement are to be closely monitored. If it exceeds the specified value, it should be shut down manually.
7.4 Valve activity test
The purpose of the steam turbine valve activity test is to inspect and prevent the valve from jamming during the operation of the steam turbine. It is divided into full stroke valve activity test.
Inspection and loosening test.
7.4.1 Test conditions
7.4.1.1 The turbine generator load maintains 50%~80% rated load and runs stably, and the main steam parameters and vacuum remain stable.
7.4.1.2 The unit exits the coordinated control mode, selects to enter "valve test" on the DEH control screen, and selects the valves to be tested in turn.
7.4.2 Full stroke activity test
7.4.2.1 During the valve full stroke movement test, the tested valve shall be fully closed (or fully opened) and then fully opened (or fully closed) as required.
7.4.2.2 During the full-stroke activity test of the main steam valve, in order to prevent excessive load fluctuations, the speed regulating steam valve corresponding to the main steam valve on this side should be closed slowly first.
After the test is completed, the main steam valve opens first, and then the corresponding speed regulating steam valve opens slowly.
7.4.2.3 For the flapping-plate type middle main valve, the balance valve should be opened first, so that the pressure difference between the front and rear of the middle pressure main steam valve is basically the same, then the middle main valve is opened.
7.4.3 Loosening test
7.4.3.1 During the valve looseness test, the valve under test is closed to a certain opening (generally 85% opening) and then reopened.
The steam valve is closed to 85% of the current opening and then reopened, the unit load fluctuation is small during the loosening test.
7.4.3.2 For the flapping plate type medium pressure main steam valve, the problem of fully closing the steam valve is likely to occur during the loosening test, and it should be prevented from opening again after being fully closed
When the unit load fluctuates too much.
8 Load rejection test
8.1 Conventional...
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