Stator iron loss and temperature rise test of No.6 generator of Tianshengqiao II Hydropower Station

Stator iron loss and temperature rise test of No.6 generator of Tianshengqiao Hydropower Station Xu Lida, the tenth detachment of Sun Ningwu Police Hydropower Corps, the insulation between the core of Jiangxi Xinyu 338Q29 and the insulation between the core bolt and the silicon steel sheet. If there is air gap looseness and poor insulation, vibration and local overheating may occur during operation, causing insulation damage of the stator bars. This poses a serious threat to the safe operation of the generator. So whether the new lamination or repair has exceeded the specified value. Therefore, it is comprehensively judged whether the condition of the laminated piece meets the requirements. The stator core of No. 56 generator of Tianhua Bridge Hydropower Station is assembled on the spot. Before the foot is hoisted into the pit, the core loss test is carried out and the temperature is measured. Lit situation.

1Iron loss test principle The principle of iron loss test is to use a special cable to wind around the stator core according to a certain number of turns and set a 1 frequency current to make the magnetic flux of the magnetic circuit inside the core, so that the poor insulation part The action of moisturizing heat. The core is measured for core loss. The temperature rise and temperature difference of each part are measured by a thermometer, and compared with the corresponding standards to check the quality of the laminated core.

Now combined with the situation of No.6 machine of Tianshengqiao Hydropower Station, the details of the iron loss test and the selection of the total 2 transformers should be introduced at the construction site of Tianshengqiao Hydropower Station. There is no ready-made iron damage test equipment. It is necessary to calculate the capacity of the test equipment according to the actual parameters of the iron core and the technical requirements of the manufacturer, and then select the corresponding transformer.

2.16 core machine core core diameter is 905 pass; iron core inner diameter is 2=807,1 ventilation groove width=0.6,1 ventilation groove number of household core yoke cross-sectional area The test transformer capacity is calculated. The requirement of the total magnetic potential of the excitation provided by the mountain manufacturer is 2.3. The main data of the excitation transformer is based on the actual situation. In the small case and the crusting, two 1-phase excitation transformers are selected as the test transformer. The main data of the excitation transformer is 630. sigh. The ratio is less than 1.81 million.

3 The selection of the wiring method is due to the corpse, so two single-phase transformers are used, and the low-voltage side is connected in series on the pressure side. When the high-pressure side turns down on page 40, male, engineer of the 10th detachment of Jiangxi Jiujiang People's Armed Police Hydropower Corps; Sun Ning 1972, male, Anhui Huangshan, assistant engineer of the 10th detachment of the Armed Police Hydropower Corps.

3 The problems and improvement measures found in the process of manufacturing the embedded parts, according to the original construction measures, found some, and, and improvement measures. Solve the question. The advantage of segmental pressing of the corner guard pressing angle is that the forming of each section is better. The disadvantage is that the welding needs to be assembled between each section, and the smoothing is corrected after welding to form the root corner working surface. Each section of the material is assembled and welded to smooth the process, which wastes the material, and the length is also difficult to control. The improvement measures are changed into segments and pressed. This reduces the number of processes, but since the press has a die length of only 1.4.4., the sheet of 1 can be formed by pressing 3 times, 1 time and 2 times. At the joint where the pressing was performed three times, there were scratches under the squat. Comparing the two methods, the second method is more time-saving, labor-saving and material-saving, which improves the work efficiency and saves the cost. Therefore, it is changed to the whole material and the whole piece is pressed. The method for treating scratch defects is to change the opening at both ends of the stamper to push-type to reduce scratches, and to smooth a small amount of scratches with a sander.

3.2 Guide rail production of guide rail angle steel often occurs at the two ends of the better distance, but the intermediate distance error is greater than the design requirements of the phenomenon if the edge modification process. The distance between the angles is fixed while reducing the human factor.

This phenomenon does not occur.

Improvement measures 圮 Fabrication of the assembled steel plate 1132 The steel plate is equidistantly welded. To ensure the straightness and parallelism on both sides of the tooling, the slabs are used to plan the sides of the tooling parallel, and the distance between the two sides is 320. Simply tighten the angles to the sides of the platform. Spot welded panel. The distance between the two angles can be guaranteed. The deviation is basically controlled within the range of 1, which not only reduces the production of the 4 knots during the production process of the burial part of the gorge, but also improves the process, so that the amorphous hydraulic steel structure is shaped and improved, and the output of the embedded parts is improved. At the same time, it reduces the human factors that affect product quality.

In the future production of steel structures, minimizing human factors and improving the use of machinery is an effective way to improve production and quality.

5 Several questions should be noted before the test. In order to prevent the excitation from changing the secondary voltage offset and higher than the secondary normal operating value, the connection points of the two excitations should be grounded. (2) In order to prevent the iron, cold and cold objects from being sucked, the stator and the circumferential surface shall be cleaned. In order to prevent the excitation cable from being damaged due to excessive vibration during the test, the core is grounded through the iron core, and the rubber gasket is reliably isolated between the cable and the iron core.

6 The test results are carried out on the evening of the day. The frequency current processed by the excitation coil is 582, and the test time is 9. Every 15 times, if the recorded loss value is converted, the unit loss 1 mean is 1.52. It is less than the requirement of 1.625 Zhu of the Harbin Electric Machinery Factory. Resistance to every 15th, the sub-temperature value is recorded. If the temperature of the nail is found to rise sharply during the test, the maximum temperature rise of the tooth and the yoke is 5.2; the maximum temperature difference is 1.5, which meets the maximum temperature rise specified by the national standard. The wine cellar is ten, one centimeter, and the sentence is distributed in the iron core touch of 25 and the maximum temperature difference is 15. Cliff