Difference between single phase and three phase submersibal pump
Answers
Answer:
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Explanation:
1PHASE WAVEFORM
Figure 2. A simple sine wave with a period of 360° and an amplitude of 1. In single phase power the x-intercepts are 180° from each other. A full period is 360°. A single phase motor has a crest approximately every 16.5 milliseconds giving the motors a tendency to vibrate more, which may contribute to a shortened bearing life.
Single phase 120V motor rotation cannot be changed without much difficulty after the motor has been manufactured. It is absolutely necessary to make sure that the rotation of the motor matches the desired rotation of the pump impeller.
Three Phase Power
Three-phase power is usually found in commercial and industrial facilities where large equipment is operated. Three-phase is usually distributed in the Wye configuration with five wires. Three of the wires carry current; the fourth wire is a neutral, and the fifth wire is an earth-ground wire. In the less-common Delta configuration there is no neutral wire. Although other configurations exist we will not discuss them in this introduction.
Three-phase power, where available, will provide smooth, more balanced, and frequently less expensive motors and motor operation. This is due to the fact that three-phase power has three identical overlapping waves. The wave cycles are evenly spaced 120° apart so the supplied power remains relatively constant when compared with single-phase power. When phase one is at a node, the next phase is only 30° and approximately 5.5 seconds from reaching its crest, and so on for each passing phase.
When compared to a single-phase power supply that uses the most common configuration (phase and neutral), a three-phase supply with no neutral, and the same phase-to-ground voltage and current capacity per phase can transmit three times as much power using just 1.5 times as many wires. Because of this, the ratio of capacity to conductor material is doubled making it possible to use smaller, less expensive wiring. See Figure 3 below for more specific waveform configuration and power phase information.
3PHASE WAVEFORM
Figure 3. Three phase power has three identical sine waves overlapping at an offset of 2π/3 radians or 120°. When one phase reaches an x-intercept or node the next phase is only 30° and approximately 5.6 milliseconds from reaching its crest.
Understanding alternate phase and wiring configurations is key to finding the best configuration for your application. Available power phase can have a major impact on your choice of motor and pump design. Understanding these basic principles will help you to understand motor efficiencies, start-up operations, and operation/maintenance costs. Please let us know if you have any questions about the ideal configuration for you.
