Effektmätning i pump

Sammanfattning: The interest for power and energy measurement has greatly raised with todays increasing electricity prices and enviromental awareness. In the search for energy efficient solutions, the measurements are more complex due to increasing of non linear components. Harmonics and non sinusoidal voltages put high demands on sampling and filtering. Meanwhile, the price must be controlled so the customer still will find it interesting to invest in smaller plants. ITT W&WW asks for a robust, heat resistant power meter with compact dimensions to allow mounting inside the casing of a pump. It should be able to measure the power, both from a regular power supply and fed from a VFD. The accuracy needs not to be on reference level, but the price/performance-ratio is an important parameter. Synchronous sample is tested, but is not considered suitable. Several test kits designed for 50 Hz AC, turn out to also measure VFD feed loads with good accuracy.