$latex \Rightarrow &s=2 &bg=ffffff$  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

# Optimum placing of an Intersheath

Now let us consider a cable with one intersheath only. Let r = Radius of core or conductor R = Overall radius r1 = Radius of intersheath Let V1 = Potential difference core and Intersheath            V2 = Potential difference between Intersheath and lead sheath. To find the optimum placing of an intersheath > … Continue reading Optimum placing of an Intersheath

# Economical Core diameter

In practice, the maximum stress value should be as low as possible. When the voltageV and sheath diameter D are fixed, the only parameter to be selected is the core diameter d. So d should be selected for which gmax value is minimum. The value of gmax , will be minimum when ∂gmax / ∂d = 0 For high … Continue reading Economical Core diameter

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

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