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Why motor temperature will be high?
Source: | Author:hkw5fd886 | Published time: 2018-12-13 | 630 Views | Share:

Dam Power Generation Company Limited 300MW units, each unit is equipped with two sets of mechanical vacuum pump, where a computer running, a spare. Vacuum pump is used when the unit starts to draw in non-condensing gas condenser during normal operation. The pump is equipped with a motor 160kW, speed 590r/min, rated current 330A, voltage 380V, B class insulation, normal operation current 220 ~ 230A. Every summer, the motor temperature will be overrun and forced the installation of temporary cooling fan, but with little success. Long-term high-temperature operation will cause the motor insulation aging and shorten its life. The causes of high temperature vacuum motor is analyzed as follows.

Analysis

(1) Electric power, operating current, heat large.

(2) low fan speed, air pressure, a small amount of wind.

(3) fewer fan blades, a small amount of wind generated.

(4) motor with dust, oil, reducing the cooling capacity.

(5) where the pump motor bus voltage is 380V, the voltage drop due to cable and uneven load distribution, the actual motor applied voltage only 365V, low voltage caused by running large current.

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