Measurement of Power

## Induction Type Wattmeter - Construction, Working & Torque Equation

Induction type wattmeter is one of the types of wattmeters that works on the principle of mutual induction. Since the principle of induction can only possible with alternating current. Thus induction type wattmeters are used for…

## Low Power Factor Wattmeter - Definition & Construction

A low power factor (LPF) wattmeter is an instrument used to measure power in low power factor circuits. This type of wattmeters is employed for power measurement in circuits whose power factor is less than 0.5.      Generally, w…

## Two Wattmeter Method of Power Measurement - Balanced Load

In the last article, we have seen the two wattmeter method of measuring three-phase power with an unbalanced load. In this, let us see the two wattmeter method with a balanced load. In a balanced three-phase system total power co…

## Three Wattmeter Method of Three Phase Power Measurement - its Disadvantages

A wattmeter is an instrument used to measure the electrical power consumed by the load. It consists of a voltage coil connected across the load and a current coil connected in series with the load. In order to measure the three-p…

## Two Wattmeter Method of Power Measurement - Blondel’s Theorem

The disadvantage of the one wattmeter method is that it cannot be used for three-phase systems that carry unbalanced loads. Also, in three wattmeter method for star-connected load, it is difficult to get a neutral point to connec…

## Three Phase Power Measurement Using One Wattmeter Method

A wattmeter is an instrument used to measure the electrical power supplied in a circuit. It consists of a voltage coil connected across the load and a current coil connected in series with the load. So that deflection of the poin…

## Reactive Power Measurement in Single phase & Three Phase Circuits

When there is the existence of inductance and capacitance in the circuit. Due to energy storing property of inductor and capacitor, it causes voltage and current to become out of phase. In order to overcome this phase shift, ther…

## Extension of Range of Wattmeter - Using Instrument Transformers (CT & PT)

In the case of circuits that carry large currents and voltages, the measurement of power can not be carried out by normal wattmeters. Thus, there is a need for an extension of the range of wattmeter. By using instrument transform…

## Errors in Dynamometer Type Wattmeter & Methods to Compensate Errors

In practice, there are some errors introduced in dynamometer type wattmeter while measuring power. Due to which the instrument indicates a value lower or higher than the actual value. Let us see various types of errors in dynamom…