Kawżi u analiżi ta ' għoli mutur temperatura

Mutur temperatura huwa għoli
A company's 300MW unit is equipped with two mechanical vacuum pumps for each unit, one of which is operating and the other is on standby. The vacuum pump is used to evacuate the unit when it is started, and to extract uncondensed gas in the condenser during normal operation. The pump is equipped with a 160kW motor, a rotational speed of 590r/min, a rated current of 330A, a voltage of 380V, Class B insulation, and a current of 220~230A during normal operation. Every summer, the motor temperature exceeds the limit, forcing the installation of temporary cooling fans, but with little success. Long-term high-temperature operation of the motor will cause insulation aging and shorten its service life. The reasons for the high temperature of the vacuum pump motor are analyzed as follows.
Kawża Analiżi
(1) The motor has large power, large working current, and high calorific value.
(2) Il-fann veloċità huwa baxx % 2c ir-riħ pressjoni u arja volum huma żgħar.
(3) In-numru ta ' fann xfafar huwa żgħir u l- arja volum iġġenerat huwa żgħir.
(4) Il-mutur huwa kopert bi trab u żejt , li inaqqas is-sħana is-sħana dissipazzjoni kapaċità.
(5) Il bus vultaġġ of the vacuum pump motor is 380V. Due to cable voltage drop and uneven load distribution, the actual voltage applied to the motor is only 365V. The low voltage results in large operating current.
Kontromiżuri
Il-mutur qawwa u veloċità match il vakwu pompa u ma jistax jinbidel . Il- fann huwa installat fuq il-mutur spindle. The motor speed determines the fan speed and cannot be replaced. Although increasing the number of fan blades can play a certain role, it is not easy to find the dynamic balance after the number of blades is increased. If the alignment is not correct, it will cause increased vibration of the Mutur.
(1) Ittawwal l-oriġinal fan cover by 40cm, and install an axial flow fan with the same diameter as the fan cover inside. The axial flow fan motor has a power of 850W, a rotation speed of 1489r/min, and a a voltage of 380V. The original fan remains. The axial flow fan is equipped with another power supply control, and the axial flow fan and the main motor are not interlocked. After the vacuum pump is started, the axial flow fan should be started immedjatament, and the axial flow fan should be stop 30 minutes after the vacuum pump is stopped, so the main motor can be fully cooled;
(2) Regolarment neħħi trab on il mutur, żomm il mutur's sħana sink nadif, u żieda tagħha sħana dissipazzjoni kapaċità;
(3) Aġġusta il - xarabank vultaġġ ta ' il vakwu pompa għal 400V.
Effett
(1) Due to the high speed of the axial flow fan and the large air pressure and air volume, the cooling effect is greatly enhanced. Under the same ambient temperature and load current, the temperature of the main motor dropped by 12 degree . The main motor temperature no . The main motor temperature no longer overs the limit in in summer.
(2) The axial flow fan can be controlled manually. After the main motor is shut down, the axial flow fan can still run, which can fully cool the main motor.
(3) Try to balance the load distribution of the two bus sections to prevent the voltage of a certain bus section from dropping too much due to overload.
(4) After voltage adjustment, the operat current of the vacuum pump is reduced to 210A, and the heat generation is relatively reduced.
(5) Slow down the insulation aging speed of the main motor and extend its service life.