TESTING OF ENERGY METERS
TESTING OF ENERGY METERS Energy meters are tested at the following conditions: At 5% of rated current at unity power factor At 100% or 125% of rate…
measurement
ERRORS IN INDUCTION-TYPE ENERGY METERS AND THEIR COMPENSATION
ERRORS IN INDUCTION-TYPE ENERGY METERS AND THEIR COMPENSATIO N 1.Phase-angle Error 2.Error due to Friction at Light Loads 3.Creeping Error 4.Error …
PERMANENT MAGNET MOVING COIL
PERMANENT MAGNET MOVING COIL Principle of Operation The principle on which a Permanent Magnet Moving Coil (PMMC) instrument operates is that a torque…
Definition of Indicating, Integrating ,Recording Instruments, damping torque etc.
DEFINITIONS OF SOME STATIC CHARACTERISTICS 1.Accuracy: Accuracy is the closeness with which the instrument reading approaches the true value of the …
Errors, Advantage, Disadvantage and Application in Moving Iron Instruments
Explanation of Errors in Moving Iron Instruments There are two types of error which occur in moving iron instruments. They are 1. Errors with bot…
Error, Advantage ,Disadvantage and application of Moving coil Instrument
E xplanation of Errors in Moving Coil Instruments: The errors that usually occur in PMMC instruments are: 1.The frictional error. 2.Temperature err…
Error in Induction Type Energy meters
Error in Induction Type Energy meters: Energy meters should give correct readings over a period of several years under normal use conditions. Some of…
What is Loading Effect in Measurement? Examples
What is Loading Effect? In simple words, when the load affects the power source then it is called Loading effect. We know that a practical power so…
Measuremnt Numericals --Electrical Engineering (MCQ) questions and answers
1. A 250V single phase watt hour meter has a constant load of 5A passing through it for 8 hours at a power factor of 0.8. If the …