Single Wattmeter Method; In this post, we will discuss the Two Wattmeter Method for power measurement. Two Wattmeter Method: In two wattmeter method, a three phase balanced voltage is to a balanced three phase load where the current in each phase is assumed lagging by an angle of Ø behind the corresponding phase voltage. Such a sleeve has a substantial negative temperature coefficient of permeability over the range of temperatures to which watthour meters are normally subjected in operation. In order to improve the efficiency of the watthour meter a soft magnetic tongue 61 is located intermediate the pole faces of the current po 19 with its upper face in. The ac motors are classified as single and 3 phase induction motors, synchronous motor and some special purpose motors. Out of all these types 3 phase induction motors are widely used various industrial applications. The important advantages of 3 phase induction motors over other types are self starting property, no need of. Components of Watthour Meters; Current, Voltage, and Power in AC Circuits; Types of Circuits and Their Measurements; Adjustments and Compensation of Meters; Use of Current and Potential Transformers; Register Constants and Multipliers; Meter Mountings and Service Connection Diagrams. PART 2 (B).

Introduction, Blodel’s Theorem for N-Phase P-Wire System, Measurement of Power in Three Phase Balanced and Unbalanced Systems, Three Wattmeter Method, Two Wattmeter Method, One Wattmeter Method, Measurement of Reactive Volt Amperes, Single Phase VARmeter, Polyphase Varmeter, Reactive Power Measurement in Three Phase Circuit, Three Phase. Course #: A-B Duration: 20 hours Course Prerequisites: Analog Circuit Measurement (Block A23); Introduction to Algebra, Geometry, and Trigonometry (Block X02); What Students Learn: PART 1 (A). Components of Watthour Meters; Current, Voltage, and Power in AC Circuits; Types of Circuits and Their Measurements; Adjustments and Compensation of Meters; Use of Current and Potential. The current coil of each wattmeter carries the current of one phase only and the pressure coil measures the phase voltage of the phase. Hence, each wattmeter measures the power in a single phase. The total power in the load is given by the algebraic sum of the readings of the three wattmeters. P = . Energy Meter. This shows the amount of power (electric energy) used over a certain period. In a watthour meter, there are two sets of windings.. One is the voltage winding while the other is the current winding. The field developed in the voltage windings causes current to be induced in an aluminum torque produced is proportional to the voltage and current in the system.

5. Conclusions. This paper presents a new method for testing the full load temperature rise of three phase induction motors. The method is simply to connect the motor under test while it is unloaded to a supply of voltage higher than the rated voltage of the motor by about 20%. Another interesting result is that now at T = K, we still have a considerable amount of conversion. Thus, although the temperature is so low to start with, the temperature will eventually increase to K, which increases the reaction rates. Contrast to the trend in the conversion, the selectivity decreases with increasing temperature. A single phase induction motor is drawing 10 amps at volts. If the operating power factor of the motor is , then the power drawn by the motor is a) kW b) kW c) kW d) kW The quantity of heat required to raise the temperature of 1 gram of water by 1 OC is termed as. Modern electricity meters operate by continuously measuring the instantaneous voltage and current and finding the product of these to give instantaneous electrical power which is then integrated against time to give energy used (joules, kilowatt-hours etc).The most common type of electricity meter is the electromechanical induction meter. This consists of an aluminium disc which is acted upon.