QFSN-300-2-20B 350MW steam turbine generator is our company's experience in summarizing the first generation and second generation 300MW steaming products. It successfully applied mature technology, optimized design, and introduced and digested the advanced technologies of Westinghouse and Hitachi. , the newly developed 350MW steam turbine generator. The first product of this model was produced for Guizhou Anshun Power Plant. In order to verify that the design performance and manufacturing quality of the motor meet the design and contract requirements, the generator of this type has undergone a comprehensive type test in the factory. The first generator successfully completed the in-plant type test in January 2002. During the test, some representatives of the users participated in the testimony. Experts from relevant power plants, design institutes, power bureaus and universities and colleges were also invited to visit and guide. The test results show that the performances fully meet the national standards and contract requirements. This article mainly introduces the type test equipment, test items and analysis of test results.
2 Test equipment The type test of large-scale steam-emitting products is a systematic project. It is not only a test of product performance, but also a test of test equipment. The test equipment must be safe and reliable. The test equipment required for the type test mainly includes the main power system and the drag system, the oil supply system, the secondary circulating water system, the hydrogen oil water system and the test system.
2.1 Main power system and drag system 350MW steam-type test main power system uses a large-scale test station No. 1 and No. 2 inverter system to provide power for 8500kVA synchronous drive motor. See the power supply principle.
Power supply schematic diagram The power supply principle of this set of frequency conversion unit is: use the reactor to start the large test station 4 machine first. After the 2 machines are turned on with 4 machines, the 2 machines are connected to the grid. A set of 4000kW variable frequency power supply is formed by 2 open 1 machine, and a series of conversions are sent to the steam generating test station to supply power to the 8500kVA drag motor. The drag motor and the gear box are connected to drive the generator. The Um2 excitation cabinet of the steam test station provides 8500kVA drive excitation; the large test station 3Z2 DC machine excites the 350MW steam through the connection bus between the two test stations.
In order to ensure the safety and reliability of this variable frequency power supply, the following safety measures have been taken: 1 DC machine is used as the motor to ensure the safety and reliability of the test.
Check the high voltage and low voltage lines (including control and measurement lines) between the large test station and the overspeed and steam station.
Check the contact oil switch of the high-speed circuit in the overspeed (it is an important switch connecting the high-voltage circuit of the new and old test stations), including synchronization, insertion depth and so on.
2.2 Oil supply system Since the generator bearing lubrication and seal oil system, the drag machine and the gear box need oil source during the test, the oil supply system in the factory test is powered by the fuel tank, oil cooler and oil filter. Three sets of lower tanks and gear oil pumps (one of which is used as an accident and a backup oil pump). During the test, the opening and closing of each control valve is used to ensure the oil is used in the whole test process of the generator.
2.3 The secondary cooling water used in the test of the secondary circulating water system is composed of three pumps as the secondary cooling water circulating water pump. The partial water supply system is used for partial recycling, and the cooling water is supplemented by the plant area to maintain the power during the test. Machine hydrogen cooler, oil cooler and steam feed water cooler.
2.4 Hydrogen oil water system Because the tested generator uses the "hydrogen hydrogen" cooling method, its control equipment is the hydrogen oil water control system. The factory test hydrogen control system and the stator coil cooling water system are assembled. The sealing oil system uses a sealed oil station of the steam test station. This hydrogen-oil water control system ensures the smooth running of the generator factory test.
2.5 Test system During the test of the factory, in addition to monitoring the operation of each system, the electric quantity, non-electric quantity and thermal quantity of the drive and generator are measured according to the test items. The instruments and meters used in the test have been verified by the National Metrology Verification Department and meet the accuracy level required by the test.
Drag motor and generator electrical quantity measurement Under the various working conditions of the test, it is necessary to measure the electric quantity of the drag machine and the generator. The measurement of the voltage, current and input power of the drag machine is by dragging The power supply side of the machine is connected to two voltage and current transformers, and the electric signal is sent to the central control room, and the high-precision PA4400 multi-function digital power meter is used for automatic measurement and printing. The stator voltage and current of the generator are measured by two voltage and current transformers connected to the outlet end of the generator, and the electrical signals are introduced into the central control room. The generator excitation current is measured by a DC millivoltmeter through a shunt that is connected to the rotor circuit. The generator excitation voltage is measured by a pair of special carbon brushes on the carbon brush holder.
The shaft vibration and bearing seat vibration measurement of the generator adopts the VB41 type vibrometer manufactured by Germany Schenck Co., Ltd., and also uses the VB5500 vibrometer manufactured by Germany Schenck Company to monitor the vibration of the drag motor and generator.
Temperature data acquisition system test all temperature of the generator (including 54 RTD between stator winding layers, 54 RTDs for stator windings, 17 RTDs for stator cores, 10 RTDs for hot and cold air temperatures) by HP3054 data acquisition system test.
Generator stator voltage, current steady state and transient waveform were measured with a Model 8804 Storage Recorder manufactured by Hioki.
3 Test project 350MW steam turbine generator in the factory for type test, according to the national standard GB/T70641996 "turbine synchronous motor technical requirements" and the project required by the contract, the method according to GB/T1029-93 Synchronous motor test method is carried out. The temperature rise test method is carried out in accordance with IEEE 115-1995 "Synchronous Motor Test Method".
3.1 The main test items before the total assembly operation are in the stator position, before the rotor is inserted, the stator insulation resistance stator winding cold insulation resistance and the absorption ratio polarization index are measured. The stator winding cold DC resistance is measured. 3.2 Hydrogen charging In order to shorten the hydrogen charging test time, the test project under the no-load state of the generator is used first, then the idling test project is carried out, and finally the test project under the short-circuit condition is made.
Line voltage sinusoidal waveform distortion rate and telephone harmonic factor determination. (3) Measurement of shaft load voltage and no-load loss measurement Short-circuit characteristics and stray loss measurement 4 The test items in the air state mainly include three-phase sudden short-circuit test, voltage recovery test, two-phase steady-state short-circuit test, and two relative phases. Stable point steady-state short-circuit test, arbitrary rotor position static test method, stator AC withstand voltage test.
5 main performance analysis of the generator 5.1 no-load characteristic curve According to the data measured by the no-load characteristic test, the no-load characteristic curve is obtained (see), and the test value of the no-load excitation current corresponding to the rated voltage of the stator is 828A, which is very close to the design value 830.2A. .
No-load saturation characteristic curve 5.2 Short-circuit characteristic curve According to the data measured by the short-circuit test, the short-circuit characteristic curve (see) is obtained. The test value of the short-circuit excitation current corresponding to the rated current of the stator is 1477A, ​​which is shorter than the design value of the no-load saturation characteristic curve. The short-circuit excitation current at the rated rated voltage of the stator and the short-circuit excitation current at the rated current of the stator obtained by the load characteristics and the short-circuit characteristics are known to be 0.561. The loss analysis method is used for the calculation of the loss and efficiency efficiency of the 5.4.
The sub-winding resistance (converted to 75,) is multiplied by the square of the rated current; the actual calculation is 864...8 kW, and the design value is 871.8 kW, indicating that the actual measured resistance and temperature are relatively accurate.
Generator mechanical loss (including ventilation and wind and friction loss, bearing and oil seal loss, and brush friction loss): After the idling temperature rise is stable, measure the input power of the drag motor, and then use the input power of the drag motor Loss of drag motor losses and gearbox losses. Ventilation and wind and friction loss are obtained by hydrogen reduction pressure test. The measured value of generator mechanical loss is 670.1kW, which is 10.4% different from the design value. Generator iron consumption (no-load additional loss): the no-load test is used to measure the generator at different voltages. The input power of the lower drag machine, after deducting the loss of the drag machine, the loss of the gearbox and the mechanical loss of the generator, the iron loss of the generator under different voltages, the iron loss of the generator corresponding to the rated voltage, measured The value is 428.3kW, which is 23.6% smaller than the design value of 56087kW. This is mainly because our company uses high-quality Guigang sheet, and the unit loss of iron loss of silicon steel sheet is lower than the design selected value. This is one of the reasons for the increase in efficiency.
In the inspection time, the input power of the tractor when measuring different stator currents of the generator is measured, and the loss of the tractor, the loss of the gearbox and the mechanical loss of the generator, and the copper loss of the stator of the generator are determined, that is, the spurs of the generator under different currents are obtained. The loss curve, which corresponds to the generator short-circuit stray loss at the rated current, is 684.8kW, which is the design value of the generator excitation loss (rotor copper loss, carbon brush loss, excitation system loss): a total of 945.9kW, and The book value is close to 940.25kW.
Generator efficiency: The generator efficiency is 99.88% calculated by the above various losses, and the equivalent load method is adopted for the temperature rise of the temperature rise generator of the designed value 5.5 generator, that is, the power generation is measured under idle, no-load and short-circuit conditions. The temperature of the stator winding, the stator core, and the rotor winding.
Stator winding temperature: measured at 7jC at the stator winding and measured between the stator winding layers. The measured values ​​under three operating conditions are converted to the rated condition. The maximum temperature of the stator winding effluent rises to 19.9K. The highest temperature rise between the winding layers is 20.7K, and the temperature rise results measured by the two methods are close. The standard value is that the temperature rise of the stator winding water is not more than 30K, and the temperature rise of the stator winding (interlayer) is not more than 40K. The temperature of the stator core is measured by the temperature measuring component pre-buried in the iron core, and converted to the temperature rise of the core under the rated working condition. For the 24.8K. standard, the temperature is not more than 74K. The temperature rise of the rotor winding is measured by the pressure drop method. The temperature rise of the rotor winding to the rated working condition is 36.8K. The standard specification is not more than 64K. 6 Test results The test result data and results are shown in the table below. : Project test value Design value Standard value Contract value Stator winding DC resistance (75(n) Rotor winding DC resistance (75*) No-load excitation current (A) Short-circuit excitation current (A) Full-load excitation current (A) Mechanical loss (kW ) Iron consumption (kW) Stator copper consumption (kW) Spurious consumption (kW) Excitation loss (kW) Carbon brush loss (kW) Excitation system loss (kW) Total loss (kW) Efficiency (%) Continued table project test value design Value standard value contract armature winding temperature rise (K) 矣 40 stator core temperature rise (K) 矣 74 excitation winding temperature rise (K) 矣 64 waveform distortion rate (%) telephone harmonic factor (% flywheel torque GD2 (t- M2) short circuit than direct axis synchronous reactance xd (% Straight axis transient reactance x'd(%)矣30 negative sequence reactance x2(%) zero sequence reactance\(%) straight axis super transient reactance X"d(%)16 transient short circuit time constant T'd (s) Super-transient short-circuit time constant TJs) Straight-axis age change open time T, (7 conclusion 350MW turbo generator type test results prove that the performance of the generator meets the design requirements and meets GB/T7064- 1996 "Turbine-type synchronous motor requirements", especially the low temperature rise of the fixed rotor, large temperature rise margin and high efficiency, is a remarkable feature of the new 350MW steam turbine generator.
Through this type test, it proves that the new 350MW steam turbine generator produced by our company has advanced technology and superior performance, and the airtight test of 135MW air-cooled steam turbine generator
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