COMPARATIVE STUDY OF THE DIFFERENT UNBALANCE FACTORS OF THE INDUCTION MOTORS FOR ENERGY EFFICIENCY PURPOSE
Joseph Girgis Massoud Abd–Elmalak;
Abstract
Three-phase induction motors (3-ph IMs) are widely used in the different consumption sectors (industrial, commercial, and residential) due to their ruggedness, high efficiency, reduced maintenance, reliability, simplicity and low cost operation. Global electricity consumption used to drive electrical motors is 46%. Approximately 68.9 % of the electricity consumed worldwide in the industrial sector, 38.3% in commercial sector, 20% to 25% in agriculture sector, 20% to 25% in residential sector, 60% in transport sector and 46% of global electricity consumption are used to drive electrical motors [1].
Fig. 1.1 shows the Share of motor electricity used by end‐user sector. About 80% of industrial applications utilize 3-ph IMs [2]. Therefore, the high efficiency of 3-ph IMs operation is an important goal lead to improve the industry energy efficiency, i.e. to reduce the energy consumption further, reduction in the production costs.
Fig. 1.1 Share of motor electricity use by end‐user sector [1], 2011.
Despite all their advantages and different applications, motors have numerous drawbacks, one of them is their sensitivity to unbalanced voltage conditions. Voltage unbalance condition may appear either as various in magnitudes or as phase asymmetries. Under unbalanced conditions, the motor meets simultaneous supply voltages either over or under across different lines [3]. These phenomena have bad effect on the behavior of 3-ph IM in different scales. Any disturbance in transmission lines or unbalanced in distribution of single phase loads can introduce an unbalanced supply situation. The supply voltage can also become unbalanced due to a sudden change in the load, for example the shutdown of a factory, blown fuses in one phase of a three-phase capacitor bank, unbalanced line or phase impedances in the power system, or an open delta transformer connection, etc. [4],[5]. As per recommendations of the International Electro-technical Commission (IEC), voltage unbalance should not override
Fig. 1.1 shows the Share of motor electricity used by end‐user sector. About 80% of industrial applications utilize 3-ph IMs [2]. Therefore, the high efficiency of 3-ph IMs operation is an important goal lead to improve the industry energy efficiency, i.e. to reduce the energy consumption further, reduction in the production costs.
Fig. 1.1 Share of motor electricity use by end‐user sector [1], 2011.
Despite all their advantages and different applications, motors have numerous drawbacks, one of them is their sensitivity to unbalanced voltage conditions. Voltage unbalance condition may appear either as various in magnitudes or as phase asymmetries. Under unbalanced conditions, the motor meets simultaneous supply voltages either over or under across different lines [3]. These phenomena have bad effect on the behavior of 3-ph IM in different scales. Any disturbance in transmission lines or unbalanced in distribution of single phase loads can introduce an unbalanced supply situation. The supply voltage can also become unbalanced due to a sudden change in the load, for example the shutdown of a factory, blown fuses in one phase of a three-phase capacitor bank, unbalanced line or phase impedances in the power system, or an open delta transformer connection, etc. [4],[5]. As per recommendations of the International Electro-technical Commission (IEC), voltage unbalance should not override
Other data
| Title | COMPARATIVE STUDY OF THE DIFFERENT UNBALANCE FACTORS OF THE INDUCTION MOTORS FOR ENERGY EFFICIENCY PURPOSE | Other Titles | دراسة مقارنة للعوامل المختلفة للتشغيل الغير متزن للمحركات الحثية لغرض كفاءة استخدام الطاقة | Authors | Joseph Girgis Massoud Abd–Elmalak | Issue Date | 2017 |
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