Steady State Stability Analysis

$latex \Rightarrow &s=2 &bg=ffffff$  The steady state stability limit is defined as the maximum power that can be transmitted to the receiving end without loss of synchronism. $latex \displaystyle P_m - P_e = M \frac{d^2\delta}{dt^2} &s=2 &bg=ffffff$ All quantities are in Per Unit $latex \displaystyle P_e = P_{max} sin(\delta) &s=2 &bg=ffffff$ $latex \Rightarrow &s=2 &bg=ffffff$  Let the system be … Continue reading Steady State Stability Analysis


Swing Equation

$latex \Rightarrow &s=2 &bg=ffffff$  The problem of stability can understand electrically as well as mechanically if there is an imbalance between mechanical input torque and electrical output torque, the rotor will either accelerate or deaccelerate. Accelerating Torque $latex \rightarrow &s=2 &bg=ffffff$  $latex T_a = T_m - T_e &s=2 &bg=ffffff$ $latex \displaystyle T_m - T_e = J \frac{d^2 \theta}{dt^2} &s=2 … Continue reading Swing Equation

Capacitance Grading

The grading done by using the layers of dielectrics having different permittivities between the core and the sheath is called Capacitance grading.  In intesheath grading, the permittivity of dielectric is same everywhere and the dielectric is said to be homogeneous. But is case of capacitance grading, a composite dielectric is used. Let d1 = Diameter of … Continue reading Capacitance Grading

Intersheath Grading

In this method of grading, in between the core and the lead sheath number of metallic sheaths are placed which are called intersheats. All these intersheaths are maintained at different potentials by connecting them to the tappings of the transformer secondary. These potentials are between the core potential and earth potential. Generally lead is used … Continue reading Intersheath Grading

Capacitance of a Single Core Cable

A single core cable is equivalent to two co-axial cylinders. The inner cylinder is conductor itself while the outer cylinder is the lead sheath. The lead sheath is always at earth potential. Let d= Conductor diameter D = Total diameter with sheath The co-axial cylindrical form of cable and its section are shown in the … Continue reading Capacitance of a Single Core Cable