The motor runs and has achieved good results.
The excitation current changes with time in the curve. That is, the curve; a simple method is provided here. It can be based on the characteristics of the generator and the residual jade used to protect the equipment. The demagnetization curve from the strong excitation to the rated to no-load excitation current is plotted, and the corresponding demagnetization time is calculated from the time from the beginning of the extinction to the decay of the excitation to zero. Verified by the real machine test, the theoretical curve is basically consistent with the measured curve.
1 Principle The field winding is regarded as an inductor with a core, the number of turns is bamboo, the flux of the chain is ,, the flux is è‚€ = 4, the inductance is B, the electrical value is very small and can be neglected. The magnetizing current transients. The electric transient at both ends of the line is 〃, and the value of the induced electric potential in the line is determined by the law of electromagnetic induction å’ =. The introduction of an intermediate variable, derived by the differential rule, is performed by a corpse, with excellent pressure sensitive characteristics. The Volt motor manufacturer in the conducting area uses the protection device as a new design for the excitation system of the generator, and it is designed to use the protection device to transform the power generator that is running in the plant. Magnetic effect. The most intuitive demagnetization effect is that the extinction curve of extinction curves is particularly flat. Therefore, in the demagnetization process, it is approximately equal to a constant, that is, due to the rated speed of the generator, the terminal voltage line of the stator at no-load. Voltage rms rate, ice 0 is the number of series windings per phase of the stator windings, moxibustion, for the winding coefficient, so that the stator flux per pole, equal to the flux of the rotor field windings ignore magnetic flux leakage and high harmonics and other factors 彡. 4=2, so team=because. All are constants, so the team is directly proportional to the type. This gives the variable, = 0 and the team = with the same change rule. That is, the angle coordinate curve, 1 has the same shape if the coordinates of the two are properly configured or use the coordinates of the target value. This is the no-load characteristic curve of the synchronous generator. Provided by the motor manufacturer. It is also possible to draw a curve from the actual measurement in operation, and then rotate the curve counterclockwise by 9 to convert the coordinate to get the plant curve. This is the required demagnetization curve.
2 Draw the No.2 machine of Baishan Power Plant manufactured by Harbin Electric Machinery Factory, 3 decays 00.
In the case of the 481230 type 300 river-connected hydroelectric generator, for example, the no-load characteristics of the aircraft are as follows: According to the standard value, the curve of the no-load special curve 3 is drawn and the curve of 3 is rotated counterclockwise by 90, and the coordinates are changed accordingly. For the demagnetization curve, 3 calculation can be based on the demagnetization curve can calculate the excitation current of any size of the no-load demagnetization time, generally require the calculation of feature points.
3.1 No-load de-excitation time is: 7 is the generator stator no-load, rotor excitation current is no-load excitation current, and =930 de-excitation time. Because the generator is at no load when excited at the core, the critical state from linear saturation into saturation. Therefore, the core of the entire magnetizing process is in the linear region, and the excitation inductance of the excitation winding 1 = ruler = fj, and Ri = the constant, which is converted into the resistance of the excitation winding.
413 sense Tun potential formula, = 1 maximum voltage, = 2763, 5 Baishan bar factory 21 machine to find strong Can destroy magnetic test like record Poyang excellent pressure sensitive characteristics, demagnetization process is called approximately equal to the constant Baishan power plant 2+ machine , 700 people. In addition due to demagnetization! The iron core at the 51 linear state, 1 is also equal to the constant 1.9 signal, so the approximation is a constant, take the absolute value of the generator stator no load, the rotor excitation current is the rated excitation current, such as =169 magnetic moment of demagnetization. In the demagnetization curve to find 1.82. Find the corresponding feature point on the curve, the 3.3 strong excitation demagnetization time 7 7 for the generator is set to idle, the rotor excitation current is strong excitation current, for example, engineering time when the magnetizing time. 2263930=2.43. Find the corresponding feature points on the curve. For the 4 verifications, the author once met with many peer experts on March 7, 1986 in conjunction with Harbin Electric Motor Factory Dongfang Motor Plant Northeast Electric Survey Bureau Northeast Survey and Design Institute Baishan Power Plant. No-load strong excitation and demagnetization tests were performed on No. 2 machine of Baishan Power Plant. The on-site record of the demagnetization curve of the cabinet 5 compared 5 and 4 can be the basic shape of the two, according to the 5 scale BTmD = 7.5592.5 = 698ms, T near, according to the method described in this article and the actual demagnetization curves drawn Anastomoses can be used for one pass.
The vortex effect of the turbine generator towel on the rotor wrought iron core will be smaller than the above calculation results.
Received the date of introduction 200001 Author brief introduction Zheng Dongmei 1965, graduated from the Department of Hydrodynamics of Wuhan Institute of Hydraulic and Electric Engineering in July 1985, specializing in hydrodynamics. He is currently the director of the human resources department of Shuikou Hydropower Plant in Fujian Province and is a senior engineer.
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