How To Overcome The Error Of Power Measurement Using Wattmeter
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Industrie 4.0 Virtualization, Cloud, Analytics, Edge Cyber Security Ethernet Wireless Mobility Asset Management All Products Maintenance Electrical Mechanical Product of the Year Automation Safety Asset ManagementLean MaintenanceContract MaintenanceInventoryLubricationMaterial HandlingMaintenance StrategySwitchgearPower one wattmeter method SystemsArc FlashElectrical ManagementPower QualityMaterial HandlingLubricationMotors, DrivesPumpsGears and BearingsHydraulicsCompressed AirElectrical SystemsCompressed
Rf Power Meter
AirSustainabilityLightingRemote MonitoringOil and GasPLCsStandardsSystem IntegrationWireless SystemsMachine Vision, HMIIndustrial PCsArc FlashOSHAPPESafety SystemsMaterial HandlingEnvironmental Health White Papers Videos Case dynamometer Studies Online Training Center Webcasts eGuides Electric motor power measurement and analysis Understand the basics to drive greater efficiency. Bill Gatheridge, Yokogawa 04/15/2014 Share Energy is power factor one of the highest cost items in a plant or facility, and motors often consume the lion's share of plant power, so making sure motors are operating optimally is vital. Accurate power measurements can help to reduce energy consumption, as measurement is always the first step toward better performance and can also help extend
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the life of a motor. Small misalignment or other issues are often invisible to the naked eye, and the slightest wobble in a shaft can negatively affect productivity and quality, and even shorten the life of the motor. Over the next three issues of Applied Automation, we will discuss a three-step process for making precision electrical and mechanical power measurements on a variety of motors and variable speed drive (VFD) systems. We will also show how these measurements are used to calculate the energy efficiency for motor and drive systems. In addition, we will provide an understanding of how to make precision power measurements on complex distorted waveforms, as well as what instruments to use for different applications. Basic electrical power measurements Electric motors are electromechanical machines that convert electric energy into mechanical energy. Despite differences in size and type, all electric motors work in much the same way: an electric current flowing through a wire coil in a magneti
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>> Electrical Measurements & Units-07/17/15 « Previous Next » Wattmeter Theory And Measurement of Power - 1 - MCQsQ1. In case of dc supply and http://www.careerride.com/view.aspx?id=24151 in case of ac supply, the torque produced isA. Directly proportional to power, inversely power to powerB. Directly proportional to power, directly proportional to powerC. Inversely proportional to power, inversely proportional to powerD. Inversely proportional to power, directly proportional to powerView Answer / Hide AnswerANSWER: B. Directly proportional to power, directly proportional to power Q2. The scale of dynamometer wattmeter isA. Approximately uniformB. Cramped at how to the middleC. Cramped at the end pointsD. Crowded in the first halfView Answer / Hide AnswerANSWER: A. Approximately uniform Q3. In standard wattmeter’s, the error caused by the voltage coil is overcome byA. Connecting a high inductive resistance in series to the voltage coilB. Connecting a high inductive resistance in parallel to the voltage coilC. Connecting a compensating winding in series to the voltage coilD. Connecting how to overcome a compensating winding in parallel to the voltage coilView Answer / Hide AnswerANSWER: C. Connecting a compensating winding in series to the voltage coil Q4. In a dynamometer type wattmeter, the pressure coil connected across the load terminal isA. Highly inductiveB. Highly capacitiveC. Highly resistiveD. Non inductiveView Answer / Hide AnswerANSWER: C. Highly resistive Q5. The dynamometer wattmeter’s areA. More accurate on dc supplyB. More accurate on ac supplyC. Equally accurate on both ac and dc supplyD. None of theseView Answer / Hide AnswerANSWER: C. Equally accurate on both ac and dc supply Q6. Due to the inductance in the pressure coil of dynamometer type wattmeter, the reading will beA. High for both leading and lagging power factorsB. Low for both leading and lagging power factorsC. High for lagging power factor and low for leading power factorD. Low for lagging power factor and high for leading power factorView Answer / Hide AnswerANSWER: C. High for lagging power factor and low for leading power factor Q7. What will happen if the current coil and potential coil of dynamometer type wattmeter is interchanged?A. Potential coil will get damagedB. Current coil will get damagedC. Both current coil
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