Tricky but Easy Electrical Engineering!
h parameter of two port network is a square matrix of order 2×2. Basically it is a way to represent a two port network. It is also known as hybrid parameter. In this form of representation, voltage of input port and current of the output port is expressed in terms of current of input port … Read more
Power factor is an important parameter for the calculation of active and reactive power in electrical circuit. It has significance only for AC circuit. For DC circuit, it is not considered for power calculation.Its value is unity for DC circuit and may vary in between zero to one for AC circuit. We know that power … Read more
What is Motor and Phase Rotation Indicator? Motor and Phase Rotation Indicator is an instrument capable of indicating the correct rotation of motor corresponding to the marked phase connection on motor terminal box. It can also indicates the correct phase sequence of three phase system. Motor terminal box have terminals marked as R, Y and … Read more
Alternator or generator armature winding is always connected in STAR not in DELTA. We know that rotating magnetic filed in the air gap can only be created if the phase winding and phase currents are 120º displaced from each other in the space and time respectively. This can be achieved either in star connection or delta … Read more
Y parameter of two port network is a 2×2 admittance matrix. Since admittance is the ratio of circuit current and voltage, therefore this admittance matrix gives the relationship between the input and output current and voltage of the network. It is also known as short circuit admittance parameter. The Y parameter for a two port … Read more
Z parameter is a factor by which input voltage and current & output voltage and current of two port network is related with. For any two port network, input voltage V1 and output voltage V2 can be expressed in terms of input current I1 and output current I2 respectively. It is also known as open … Read more
What is a Lock Out Relay? Lock out relay is an electromechanical relay which latches its output contact. As the name suggests, this relay once operated locks out the circuit. Locking out means that circuit cannot be normalized until and unless this relay is reset. These relay have two types of coils: operating and resetting … Read more
Power Triangle is a right angled triangle whose sides represent the active, reactive and apparent power. Base, Perpendicular and Hypogenous of this right angled triangle denotes the Active, Reactive and Apparent power respectively. This triangle is not a new concept but it is just the schematic representation of phasor diagram of inductive / capacitive load … Read more
Active Power: Active power is the real power consumed in an electrical circuit. It is the useful power which can be converted into other form of energy like heat energy in heater, light energy in bulb etc. It is also known as true or real power and measured in terms Watt, kW (Kilo Watt) or … Read more
Definition: Proximity Effect is the phenomena of non-uniform current distribution on the surface of adjacent current carrying conductor due to the effect of another current carrying conductor in its proximity. Since in cables, the conductors are very near to each other, this effect is dominant. Whereas in overhead lines as lines are far apart when … Read more