| In recent years, in order to improve the economic operation of Unit, the power plant active frequency conversion transformation.Have achieved good economic benefits.Frequency transformation of obvious advantages, but also exposed some problems in the course.The reason is that the power plant of the original design because of cost considerations not designed to drag the motor frequency, then frequency transformation of the energy requirements. Late technological transformation often there will be a new adaptation of the old equipment.The protection of existing high voltage inverter equipment is complete, comprehensive security device in the high-voltage motors with thermal chain design is mature.The reason to mix together to protect cross-occurrence of malfunction or even to protect the blind, mainly due to the field of engineering practice was defective, and how to solve the frequency conversion device and the motor comprehensive insurance; coordination between electrical equipment and thermal protection and maintenance equipmentis an urgent need to solve the problem.Huadian Baotou power plants as a new plant, received in the high-voltage motor frequency transformation results, but also trapped in the inverter and motor protection with; maintenance system and the motor with frequency operation under abnormal conditionsautomatic interlocking issues such as the possibility to achieve.Carefully prepared, the maintenance of two units to sort out the two units of the suction fan motor protection and inverter protection, to test the final revised the protection setting; the use of sampled value differential principles to re-design the inverter modemotor differential protection composition; changing the drive access mode, Frequency-frequency switching can be achieved under inverter fault conditions, greatly increased the conversion equipment operation, safety and economy.Transformed suction fan inverter system run more smoothly, the variable frequency operation is also more convenient, with good results.Start from the principle of the high voltage inverter selection basis and the use of effects.Exposed in the actual process of using the manual bypass mode can not realize frequency frequency switching; differential protection can not be put into operation in the mode frequency; frequency devices and high voltage motor comprehensive insurance protection parameters inappropriate, and three aspects of the in-depth studyproposed a suitable solution.In addition, this transformation makes the inverter’s operating requirements and protection configuration to have a deeper understanding for the production site how to use high frequency equipment has a very important reference in the energy-saving production practices. |
PDF Full Text Request