Study On High And Low Speed Modification Of Circulating Water Pump Motor In 350MW Unit

At present, high voltage frequency conversion, high and low speed, permanent magnetic speed control, the speed of the motor speed is the speed of motor speed, which is widely used in various power plant. High voltage and high power AC induction motors are widely used in power plants, which are usually under low load condition. According to statistics, the plant accounted for 8 ~ 10% of the unit power generation capacity, about 50% of the plant is used in the circulating pump and feed water pump and other large power motor. Circulating water pump in the power consumption of the power plant after the feed pump, single mode of operation is mainly because part of the power plant adopt the single speed motor, also is in the circulation water pump, because indeed conditions of the circulating water adjustment, low working efficiency of the equipment, resulting in a significant amount of waste.By analyzing the application of Datang Changchun third 2*350MW subcritical unit of thermal power plant circulating pump motor of high speed transformation, through re lamination of the motor core,the No. 1and No. 3 circulating water pump factory, stator coil re production, according to the high speed motor for connecting with the work coil, very different principle, the external type pole logarithmic conversion box, using the high speed switching power switching mode, and double fixed value management of relay protection circuit, and a switching device, different protection input, high speed motor can be concluded the old unit transformation and new units to achieve, so the value of technology a wide range of promotion, so as to provide reference for the selection of equipment for power plant. Through the transformation of high speed pump and the speed of the cycle pump, which can be of higher requirements of circulating water units in different load and different seasons to adapt, which can not only enable the application flexibility in the regulation of pump system, can also reduce electricity costs, improve the economic efficiency of power plant?Energy conservation is the human rational development and utilization of natural resources is the eternal topic, in the world all countries attach great importance, especially in the field of electric, motor pole change speed regulation is now saving energy, improving the environment, transformation of a relatively simple way of saving energy, do not need to change the number of motors, directly change the operation mode of circulating water pump, single speed motor is equivalent to the high speed motor. By changing the stator winding connection mode, the number of the motor to adjust, resulting in changes in motor power. Energy saving transformation of power plant circulating water pump can not only improve the competitiveness, but also provide new ideas and reference for the same type of equipment.