What is the working principle of a power factor meter. Types of energy meters and their working principles elprocus. The measurement of energy is accomplished by means of a voltagefrequency converter connected downstream from the power meter. The dynamometer wattmeter works on the motor principle. When the three phase power factor meter is connected in the circuit, under balanced load conditions, the angle through which the pointer is deflected from the unity power factor position is equal to the phase angle of the circuit, because the two moving coils are fixed 120 apart. To improve the power factor it is required to connect a fixed capacitor or capacitor bank. Pdf development of power factor meter using arduino. The laws and relationships for delivering power were originally developed for direct current. The traditional form of wattmeter is called as dynamometer wattmeter. In power transmission system and distribution system we measure power factor at every station and electrical substation using these power factor meters. The power factor meter determines the types of load using on the line and it. This device is available in a purely electronic form too which is known as digital wattmeter. Power factor metering system using arduino request pdf. Dynamometer type wattmeter electrical technology youtube.
Electrical energy meters principles and applications energy management. The power factor meter is also called the phase meter. The power factor is the cosine of the angle between the voltage and current. Power and distribution transformers, which works on the principle of electromagnetic induction, consume reactive power for their own needs even when its secondary is not connected to any load. The meter requires large working force as compared to the electrodynamometer type meter. Induction type energy meter ii electrical technology ii unit 3 s.
The power factor meter determines the types of load using on the line, and it also calculates the losses occur on it. This meter is to monitor rms voltage and current, real and apparent power, and power factor in real time. Wattmeter is an instrument used to measure the electrical power. Power factor measurement provides us the knowledge of type of loads that we are using and helps in calculation of losses happening during the power transmission system and distribution. In order to simplify the problem, we assume that the current through coil b lags the voltage by exactly 90. The power factor will be very low under such situation. Power factor meter working principle your electrical guide. The megger insulation tester is an instrument used for measuring high resistances of the order of mega ohms and for testing the insulation resistance megger working principle. A second terminal block between the current transformer and the meter simplifies service work.
The voltage, the current, and the real power are calibrated with respect to a reference. The power factor meter measures the power factor of a transmission system. Electronic measurement power factor meter slideshare. According to the measuring mechanism, it can be divided into three categories. Electrodynamometer type wattmeter ammeter working principle and. Power factor meter connection, circuit, wiring diagram. Page 2 dr 290 gmbh 3 operating principles the durag dr 290 opacity monitor is designed to utilize the principles of light transmission. Power factor meters electrodynamometer type power factor.
These instruments work on air cored electrodynamometric principle. Megger working principle is based on the working principle of moving coil instruments, which states that when a current carrying conductor is placed in a magnetic field, a mechanical force is experienced by it. When connected to loads, they consume less power and start measuring instantaneous. Pdf on nov 1, 2018, teddy surya gunawan and others published development. Before we introduce various types of power factor meters it is very.
This video has described the construction and working of dynamometer type power factor meter. Construction and working principle of energy meter. Power factor meter incorporates two pressure coils one with noninductive resistance in. Electronic energy meters are accurate, precise and reliable type of measuring instruments when compared to electromechanical induction type meters. Working principle the basic working principle of pf meter is similar to that of dynamometer type wattmeter i. So, electronic type of threephase energy meter is explained below with its working principle. Chou, precisionprinciples, practices and solutions for the internet. Electrical energy meters principles and applications. Circuit theory comparisons dc machines electrical drives electrical. Single phase electrodynamometer power factor meter.
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