QFSN-300-2-20B 350MW turbogenerator is our company's experience in summarizing the first generation and second generation 300MW steam blower products. Successfully applying mature technology, optimizing design, and introducing and digesting the advanced technologies of Westinghouse and Hitachi, etc. , Newly developed 350MW turbine generator. The first product of this model was produced for Guizhou Anshun Power Plant. In order to assess and verify whether the design performance and manufacturing quality of the motor meet the requirements of the design and contract, the model generator was fully tested in the factory. The first generator successfully completed the in-plant type test in January 2002. At the time of the test, representatives of the users participated in the testimony, and experts from domestic power plants, design institutes, power bureaus, and universities and colleges were invited to visit and guide. The results of the tests showed that the performances completely met the national standards and contract requirements. This article mainly introduces the type test equipment, test items and analysis of test results.
2 Test equipment Type test of large-scale steam products is a systematic project. It is not only a test of product performance, but also a test of test equipment. Test equipment must be safe and reliable. The test equipment required for type testing mainly includes a main power supply system and a drag system, an oil supply system, a secondary circulation water system, a hydrogen oil water system, and a test system.
2.1 Main power system and drive system The main power system of 350MW steam hair type test adopts the frequency conversion system composed of the large-scale test station No. 1 machine and No. 2 machine to provide the power supply for the 8500kVA synchronous drive motor. See the power supply principle.
Power supply principle diagram The power supply principle of this set of frequency conversion unit is: Use the reactor first to start up the 4 large-scale test stations. After opening the 2 machines with 4 machines, the 2 machines are connected to the network. Using a 2 open 1 machine to form a set of 4000kW variable frequency power supply, through a series of conversions, to the test station to the power to the 8500kVA drag motor power supply, drag motor and gear box connected to drive the generator. The Um2 excitation cabinet at the test station of the steam-producing station provides 8500kVA excitation of the dragger; the 3Z2 direct current machine at the large-scale test station is excited to 350MW by the connecting bus between the two test stations.
In order to ensure the safety and reliability of this set of variable frequency power supply, the following safety measures have been taken: 1 A DC motor is used as a motor to ensure safe and reliable testing.
Check the high-voltage and low-voltage lines (including control and measurement lines) between the large-scale test stations and the over-speed room and the steam station.
Check the contact oil switch of the high-pressure circuit of the overspeed (it is an important switch connecting the high-pressure circuit of the old and new test stations), including synchronization, insertion depth, etc.
2.2 Oil Supply System Because 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 is the fuel tank, oil cooler, oil filter from the steam test station. Three oil tanks, one under the tank, and one gear oil pump (one of them is used as an accident and auxiliary oil pump). During the test, through the opening and closing of each control valve, the generator is guaranteed to use oil during the entire test.
2.3 Secondary cooling water system The secondary cooling water used for the test consists of three pumps as the secondary cooling water circulating pump. The partial cooling system is used by the plant's water supply system. The appropriate amount of water is discharged and the cooling water is supplied from the plant area to keep the power generated during the test. Hydrogen coolers, oil coolers and steam-feed water coolers are used.
2.4 Hydrogen oil and water system As the generator under test uses the "hydrogen-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 packaged. The seal oil system uses the seal oil station of the steam test station. The hydrogen oil water control system ensures the smooth progress of the generator factory test.
2.5 Test System During the whole test process, not only the operation of each system is monitored during the whole test process, but also electrical and non-electrical quantities and thermal quantities of the dragging machine and generator are measured according to the test items. The instruments and meters used in the tests were verified by the national metrological verification department and met the accuracy requirements of the tests.
To measure the electrical quantity of the drag motor and the generator under various conditions of the test, it is necessary to measure the electrical quantity of the dragging machine and the generator. The measurement of the voltage, current and input power of the dragging machine is performed by dragging. The power supply side of the machine is connected to two voltage and current transformers, sending electrical signals to the central control room, and using the high-precision PA4400 multi-function digital power meter to automatically measure and print. The generator stator voltage and current are measured by two voltage and current transformers connected to the generator's outlet. The generator excitation current is measured by a DC millivoltmeter through a shunt that is connected to the rotor circuit. The excitation voltage of the generator is measured by a pair of special carbon brushes on the carbon brush holder.
Shaft vibration and bearing vibration of the generator were measured using the VB41 vibrometer from Germany's Schenck, and the VB5500 vibrometer from Germany's Schenck was used to monitor the vibration of the drag motor and generator.
Temperature data acquisition system tests all generator temperature (including 54 RTDs between stator windings, 54 RTDs for stator windings, 17 RTDs for stator core, and 10 RTDs for hot and cold air). HP3054 data acquisition system from HP, USA test.
Generator stator voltage, current steady-state, and transient waveforms were measured using a Model 8804 Storage Recorder manufactured by HITACHI.
3 Test items 350 MW turbine generators were tested in the factory according to the national standard GB/T70641996 "Technical Requirements for Turbine Synchronous Motors" and the items required by the contract, according to GB/T1029-93. Synchronous motor test method". The temperature rise test method is referred to IEEE115-1995 "synchronous motor test method".
3.1 Main test items before operation after total assembly Before the stator is inserted, measure stator stator resistance. Measurement of cold insulation resistance and absorption ratio polarization of stator windings Cold current resistance measurement of stator windings 3.2 Hydrogen charging In the state of the test project In order to shorten the hydrogen charging test time, the test item of the generator under the no-load condition is taken first, then the idle test item is made, and finally the test item under the short-circuit condition is made.
Line voltage sinusoidal waveform distortion rate and telephone harmonic factor determination. (3) Measurement of shaft voltage No-load characteristic curve and no-load loss Measurement of short-circuit characteristics and stray loss 4 The test items under air conditions mainly include three-phase sudden short-circuit test, voltage recovery test, two-phase steady-state short-circuit test, and two-phase comparison. Static point short-circuit test, arbitrary rotor position static measurement, stator AC withstand voltage test.
5 Generator main performance analysis 5.1 No-load characteristic curve According to the data of no-load characteristic test, the no-load characteristic curve is obtained (see below). The test value of the no-load excitation current corresponding to the stator rated voltage is 828A, which is very close to the design value of 830.2A. .
No-load saturation curve 5.2 Short-circuit characteristic curve Short-circuit characteristic curve is obtained according to the data measured by the short-circuit test (see), and the short-circuit excitation current test value corresponding to the rated current of the stator is 1477 A. The ratio of no-load saturation curve to design value is 5.3. The short-circuit excitation current at the no-load excitation current and the stator current at the rated stator current obtained from the load characteristics and short-circuit characteristics is known to be 0.561. The loss ratio and efficiency efficiency are calculated using the loss analysis method.
Determine the sub-winding resistance (converted to 75,) and the square of the rated current multiplied; the actual calculation is 864 ... 8kW, the design value is 871.8kW, indicating that the actual measured resistance and temperature are more accurate.
Generator mechanical loss (including ventilation and friction loss, bearing and oil seal loss, and brush friction loss): After the idle 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 losses were obtained using hydrogen pressure drop test. The measured value of generator mechanical loss was 670.1 kW, which was different from the design value by 10.4%. Generator iron loss (no-load additional loss): Measurement of generator at different voltage during no-load test Under the input power of the drag machine, after deducting the loss of the drag machine, the loss of the gear box and the mechanical loss of the generator, the iron loss of the generator under different voltages is obtained, and the corresponding generator voltage is the iron loss of the generator. The value is 428.3kW, which is 23.6% smaller than the designed value of 56087kW. This is mainly because the company uses high-quality Gui Gang films. The unit loss ratio of the iron loss of the silicon steel sheet is lower than the designed value. This is also one of the reasons for efficiency improvement.
At the time of the test, the power input of the dragger when measuring the stator current of the generator is deducted, and the loss of the drag machine, the loss of the gear box and the mechanical loss of the generator, and the copper loss of the stator of the generator are deducted, ie, the spur of the generator under different currents is obtained. The loss curve, which corresponds to the rated current, is the short-circuit stray loss of the generator. The measured value is 684.8kW, which is the design value generator excitation loss (rotor copper loss, carbon brush loss, and excitation system loss): the total is 945.9kW. The value of 940.25kW is close.
Generator efficiency: The generator efficiency is calculated to be 98.98% using the above losses, and the temperature rise of the generator is 5.5 times the design value. The equivalent load method is used for the temperature rise of the generator, ie, the power generation is measured under idling, no-load, and short-circuit conditions. Machine stator winding, stator core, rotor winding temperature.
Stator winding temperature: measured at the stator winding 7jC and measured between the stator winding layers, the measured value under the three conditions, converted to the rated working condition, the highest temperature of the stator winding water rises to 19.9K. The highest temperature rise between winding layers is 20.7K. The temperature rise results measured by the two methods are close. The standard specification is that the temperature rise of the stator winding outlet 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 a temperature measuring element that is pre-buried in the iron core, and is converted to the rated temperature core temperature rise. To 24.8K. The standard stipulates not more than 74K. The temperature rise of the rotor winding is measured by the pressure drop method, and the temperature rise of the rotor winding is converted to rated working condition to 36.8K. The standard requirement is not more than 64K. 6 Test results The test result data and results are shown in the following table : Item 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 Loss (kW) Dissipation (kW) Excitation Loss (kW) Brush Loss (kW) Excitation System Loss (kW) Total Loss (kW) Efficiency (%) Continued Table Test Value Design Standard value Contract armature winding Temperature rise (K) 矣 40 Stator core temperature rise (K) 矣 74 Winding temperature rise (K) 矣 64 Waveform distortion rate (%) Telephone harmonic factor (% flywheel torque GD2 (t- M2) short-circuit ratio than direct-axis synchronous reactance xd (% Direct-axis transient reactance x'd (%) 矣 30 Negative-sequence reactance x2 (%) Zero-sequence reactance (%) Direct-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-changing open-circuit time T, (7 Conclusions 350MW turbogenerator type test results prove that the generator's performance meets the design requirements and complies with GB/T 7064- 1996 "turbine synchronous motor requirements", especially the stator rotor temperature rise is low, large temperature margins, efficiency, is a significant feature of the new 350MW turbine generator.
Through this type test, it is proved that the new 350MW turbogenerator produced by our company is advanced in technology and superior in performance, and the airtight test of 135MW air-cooled turbine generator
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