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300kA Aluminum rectifier to improve the methods and practice of load capacity


Current distribution arm showed flow to the bottom end of the sloping saddle rule, select the device forward voltage drop similar to the distribution and current distribution in order to achieve current sharing rectifier arm components and improve the device is relatively uniform flow coefficient between the objective of both . 3.1.4 components of the phase matching between the rectifier arms measured under the transformer secondary AC voltage, the voltage of the bridge arm selection of high pressure drop larger components (greater than the normal 100 ~ 350my), the low voltage bridge Select the pipe pressure drop arm smaller components (less than the normal 200 ~ 350my), in principle. Relative difference to a rectifier cabinet (or a rectifier unit) units matching. Then the current characteristics of single-arm parallel positioning device separation. 3.2 Rectifier installation requirements in accordance with the above components requires that all components assigned to each branch of each leg on the road, and then components and accessories can be installed. Check the device junction clean and free of pressure oxidation, and cooling in the water bridge arm silicone grease coated the surface of the water box, locate the component and water box device will slow uniform compression plate arm in the water bridge, to ensure that components subject to diversion table Force uniform and sufficient contact pressure to avoid slippage caused by run-time components accident, as far as possible all the same degree of compression components, component adjustment plate deformation uniformity, use the torque wrench to tighten components. After installing the device checks the positive and negative rectifier cabinet insulation resistance of the shell is qualified. If the installation failed Check the box to touch the water cooled leg (AC and DC short-circuit), remove again to check the insulation up to standard. 3.3 Test and adjust the rectifier cabinet will be installed to do a good inspection and regulations before running tests were normal load will be put into operation the rectifier cabinet, in accordance with the current rating of 30%, 50%, 75%, 100% rise in stages flow. And after each up-flow measuring devices are no exception after the current situation in the next step up-flow operation. And under the conditions of rated current flow coefficient measurements were calculated, measurement errors should be to ensure that not more than 5% to 10%. Of course, not all at once flow coefficient to achieve the desired value. After several repeated adjustments needed to get close to the expected value. Adjustment principles: (1) the spirit of \If the treatment is still mainly the replacement of components for power processing. (2) For components are flow coefficient on the arm does not meet the requirements. Replace the whole arm than the average gap shunt maximum current maximum and minimum components. The slip road will be replaced with the current large forward voltage drop slightly larger than the original components. Replace the current small slip forward voltage drop smaller than the original some of the components. (3) If the components are close to the required flow coefficient,[link widoczny dla zalogowanych], you can adjust the slip resistance of the resistor as a suitable replacement fast melting, reduce the contact resistance so that both slip flow coefficient meet the demand. (4) The flow coefficient of each phase are non-compliant,[link widoczny dla zalogowanych], compared to the average of the arm relative to the average gap between the largest high-current bridge arm and leg for a small current components for processing,[link widoczny dla zalogowanych], so that the average phase of each phase close. Through the implementation of the above methods. Inter-leg rectifier cabinet can usually flow factor were 0.94 ~ 0.97, both components can be achieved flow factor of 0.65 to E4 conclusion in the case of no additional investment in equipment, through commissioning to improve the current equilibrium level rectifier cabinet, thus ensuring the rectifier transformer, rectifier cabinet in the premise of safe operation,[link widoczny dla zalogowanych], improve rated current 10% to 15%, for the cell to provide power to strengthen the current terms of technical support, especially for more than 50,000 t increase efficiency aluminum industry, effect of reducing significantly the cost of tons of aluminum. 280kA to 300kA series of electrolytic current enhancement has been put into operation, the rectifier system is stable. Practice shows that the current balance by increasing the degree to guarantee the flow of units, but the premise of improved output current capability of the rectifier cabinet, the method is feasible. In 290kA, 295kA, 300kA stable flow factor were measured. Rectifier stable operation,[link widoczny dla zalogowanych], the operating parameters to meet the requirements. 5 Suggestions (1) As the dispersion characteristics of high-power silicon rectifier devices large components to be run according to current measurements under the forward voltage drop to matching. (2) The current balance adjustment of the degree of heat stability, magnetic field, the adjusted current changes will take some time to stabilize. Measurements should be noted that such a situation. (3) adjusting the degree of rectification components to improve the current balance of compaction degree should be in a \Factor conducive to the stability of both streams. References: [1] Liu Bin waiting for repentance. The power rectifier design [M]. Metallurgical Industry Press. 1982 [2] power converter equipment for construction and acceptance [S]. GB50255 - 1996 [3] Chun-forward. Semiconductor converter technology [M]. Machinery Industry Press. 1988 (Editor Heyun Ping��

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