Transposition of Conductors

Definition: The transposition is a physical rotation of the conductors so that the conductor is moved to take up the next physical position in the regular sequence. The transposition of the conductor equalises the mutual inductance and capacitance between the lines. The irregular spacing between the conductor gives a complex value of inductances which makes…

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Sequence Impedance

The sequence impedance of the network describes the behaviour of the system under asymmetrical fault conditions. The performance of the system determines by calculating the impedance offered by the different element of the power system to the flow of the different phase sequence component of the current. Every power system component (static or rotating) has…

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Difference Between NPN & PNP Transistor

One of the major difference between the NPN and PNP transistor is that in NPN transistor the current flows between collector to emitter when the positive supply is given to the base, whereas in PNP transistor the charge carrier flows from emitter to collector when negative supply is given to the base. The NPN and…

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Single Line Diagram of 11kV Substation

Substation provides the energy supply for the local area in which the line is located. The main function of the substation is to collect the energy transmitted at high voltage from the generating station and then reduce the voltage to an appropriate value for local distribution and gives facilities for switching. The substation is of…

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Sequence Networks

Definition: The sequence impedance network is defined as a balance equivalent network for the balance power system under an imagined working condition so that only single sequence component of voltage and current is present in the system. The symmetrical components are useful for computing the unsymmetrical fault at different points of a power system network.…

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Regulating Transformer

Definition: The transformer which changes the magnitude and phase angle at the certain point in the power system is known as the regulating transformer. It is mainly used for controlling the magnitude of bus voltage and for controlling the power flow, which is controlled by the phase angle of the transformer. They provide the small…

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Summation Current Transformer

Definition: The transformer which is used for converting the three-phase quantities into the single phase quantity is known as the summation transformer. This transformer is mainly employed for the unbalanced condition in the system and due to fault condition so that the relay operates properly. The connection of the summation current transformer is shown in…

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Difference Between Diode & Transistor

One of the major difference between the diode and the transistor is that the diode converts the alternating current into direct current while the transistor transfers the input signals from the low resistance circuit to high resistance circuit. The other differences between them are explained below in the tabulated form. The diode is also known…

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Classification of Transmission Lines

The classification of the transmission lines depends on its voltage and the length of the conductor. The transmission line is the medium of transferring the power from the generating station to the load centre. It is mainly classified into two types. They are the AC Transmission Line Short-Transmission Line Medium Transmission Line Pi Model of…

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Line Regulation

Definition: The voltage or line regulation is defined as the variation in the voltage at the receiving end of the line when the full load at a given power factor is removed and the voltage at the sending end being kept constant.  In other words, it is defined as the percentage variation in voltage at…

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