Drawing of fast demagnetization curve of synchronous generator

The motor is running and has achieved good results.

The curve of the excitation current in æžµ varies with time. That is, the curve; here is a convenient way. It can be based on the characteristics of the generator and the residual jade used for the protection. The demagnetization curve from strong excitation to rated to no-load excitation current is plotted, and the time during which the corresponding de-excitation time elapses from the start of the sweat to the decay of the excitation turbulence to zero is calculated. It is verified by the real machine test that the theoretical curve is basically consistent with the measured curve.

1 Principle The excitation winding is regarded as an inductive coil with iron core, the number of turns is bamboo, the flux of the interlinking is the order, the flux linkage is 肀=4, the inductance is B, the electric value is negligible, and the coil is circulated. The field current transient value. The electrical end of the line is called the transient state, and the inductive potential state in the line is induced by the electromagnetic induction law 咐 =. The intermediate variable is introduced by the differential rule. 1. By the corpse, excellent pressure sensitive characteristics, In the conduction area, the Fu motor manufacturing plant adopts the protection device as the new design generator excitation system, and the Gucheng is the generator technology operation of the plant. Before the protection device is adopted, it is often used. Magnetic effect. The most intuitive demagnetization effect is that the demagnetization curve has a particularly flat demagnetization characteristic curve, so it is called a constant equal to the constant during the demagnetization process, and the terminal voltage line when the stator is idling due to the rated speed of the generator. The effective value of voltage, ice 0 is the number of turns in each phase of the stator winding, moxibustion, is the winding coefficient, so that the magnetic flux per pole of the stator is equal to the magnetic flux of the cross-linking of the rotor excitation winding, which ignores the magnetic flux leakage and higher harmonics. . 4=2, so the team = due. All are constants, so the team is proportional to the work. From this, the variable can be obtained, and =0 has the same change rule as the team=. That is, the angle coordinate curve, 1 has the same shape if the coordinates of the two are properly configured or both use the value of the standard value. This is the no-load characteristic curve of the synchronous generator. Provided by the motor manufacturer. It can also be used to draw the curve according to this, and then rotate the curve counterclockwise by 9 and transform the coordinates to obtain the factory curve. This is the required demagnetization curve.

2 draw the No. 2 machine of Baishan Power Station, manufactured by Harbin Electric Machinery Factory, 3 00.

For example, the 481230 type 300 river water turbine generator, the no-load characteristic of the machine is as follows: using the standard value to draw the no-load characteristic curve 3, the curve of 3 is rotated counterclockwise by 90, and the coordinates are changed accordingly. For the demagnetization curve, 3 can calculate the no-load demagnetization time of the excitation current of any size according to the demagnetization curve, and generally calculate the characteristic points.

3.1 No-load demagnetization time is, 7 is the generator stator no-load, the rotor excitation current is the no-load excitation current, and the de-excitation time is 930. Because the generator is vacantly excited at the core, the linear state enters the critical state of saturation. Therefore, the core of the entire pyromagnetic process is in the linear region, and the inductance of the field winding is 1 = ruler = fj, and Ri = the inter-constant, which is the resistance of the field winding.

413 feelings of potential formula, = 1 maximum voltage, = 2763, 5 Baishan bar factory 21 machine to find strong de-magnetization test like the recording of Po Yang excellent pressure-sensitive characteristics, in the process of demagnetization is called equal to the constant to the Baishan Power Plant 2+ machine , 700 of them. In addition, due to the demagnetization! The center of the iron core is 51 linear, 1 is also equal to the constant 1.9 signal, so it is approximately constant. The absolute value is the no-load of the generator stator, and the rotor excitation current is the demagnetization time of the rated excitation current such as =169 private time. Find 1.82 on the demagnetization curve. Find the corresponding feature point on the curve. The strong excitation time of the 3.3 is the no-load of the generator, and the excitation current of the rotor is the excitation current of the strong excitation current such as the work. 2263930=2.43. Find the corresponding feature points on the curve, and the 4 verification authors on March 7th, 1986, together with Harbin Electric Machinery Factory Dongfang Electric Power Plant Northeast Electric Power Bureau Northeast Survey and Design Institute Baishan Power Plant and many other peer experts The no-load strong de-excitation test was carried out on the No. 2 machine of Baishan Power Plant. The demagnetization curve of the live recording is compared with 5 and 4, and the shape of the curve is basically the same. According to the 5 scale, BTmD=7.5592.5=698ms, T is near, and the demagnetization curve which can be drawn according to the method described in this paper is equivalent to the actual one. It can be used for 1 course.

The turbine generator towel has a strong eddy current action on the rotor forging core, and the demagnetization time will be smaller than the above calculation result.

Received by the thorn 200001 Author brief introduction Zheng Dongmei 1965, graduated from the Department of Power Engineering, Wuhan Water Conservancy and Electric Power College in July 1985, is currently the director of the human resources department of Fujian Shuikou Hydropower Plant, senior engineer.

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