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Qiu Baoyun
Huang Jiyan
Water Conservancy College,
Yangzhou University,
Yangzhou 225009, China
Yuan Shouqi
Fluid Mechanical Engineering
Technique Center,
Jiangsu University,
Zhenjiang 212013, China |
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study on Power spare
coefficient of electrical
motor in large pump station
based on reliability*
Abstract: Characters of head of low head pump station and the pump shaft power are analyzed. Influence of each single factor on pump shaft power is expressed as change of specific shaft power (non-dimensional) and the probability density function is determined. Influences of multiple factors on pump shaft power are analyzed. Method of calculating none over-loaded probability of motor by integration by successive reductions is put forward and then relation
between power spare coefficient and none over-loaded reliability
of electric motor is established. Influences of all factors on
pump shaft power being considered completely; power spare
coefficients of motor are calculated in three kinds of heads
(changing and unchanging), two kinds of dirty-out conditions.
Electrical motor power spare coefficients should be chosen as
1.20~1.44, 1.11~1.19, 1.09~1.14 respectively when pump heads are 4, 7, 9.5 m. The results mean much to reasonable choose of electrical motors in large pump stations, increasing reliability of pump units and saving equipment investment.
Key words:
Large pump station Electrical motor Power spare coefficient Probability of none over-loaded
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