Abstract
This paper presents an indirect method for measuring the mechanical power produced by three-phase induction motors. The proposed technique is based on the hypothesis that three-phase induction motors are balanced systems that transform electrical power into mechanical one. The measurement of a single phase current is used to estimate the mechanical power generated at the axis. The relationship between electric current and mechanical power is generally non-linear. By expressing the quantities in p.u., this trend is approximated with a second order polynomial. From the analysis of the mechanical power characteristics related to 13 motors we obtained the parameters of the interpolating parabolic curves of motors from 1.1 kW to 75 kW rated power. The proposed technique can be easily adopted in order to monitor the mechanical power of three phase induction motors using only one phase current transducer. Starting from the motor nameplate no experimental measurement or other data are necessary to estimate the mechanical power. This technique can be widely used in low cost multipoint measurement system able to monitor the mechanical power where no other transducer or voltage divider are necessary.
References
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Articles in the same Issue
- Prospectives for the Use of Li-Ion Batteries in Hybrid Stand-Alone Power Sources
- Development of an Over-Temperature Supervising System of Switch Cabinet Based on Gas Sensing Technology
- Robust Investment for Demand Response in a Distribution Network considering Wind Power and Load Demand Uncertainties
- Reduction of Electric Field Stress on the Surface Contour and at the Triple Junction in UHVAC GIS by Spacer Design Optimization
- Optimal Energy Scheduling Method under Load Shaping Demand Response Program in a Home Energy Management System
- Sequence Component-Based Improved Passive Islanding Detection Method for Distribution System with Distributed Generations
- Optimal Switching Angle Scheme for a Cascaded H Bridge Inverter using Pigeon Inspired Optimization
- A Novel System and Experimental Verification for Locating Partial Discharge in Gas Insulated Switchgears
- A Comprehensive Induction Machine Model for Multi-Phase Power Flow Studies – Application to Industrial Power Systems and Wind Farms
- A Simplified Indirect Technique for the Measurement of Mechanical Power in Three-Phase Asynchronous Motors
- Three-Phase Grid Connected Bi-Directional Charging System to Control Active and Reactive Power with Harmonic Compensation