For the transmission line which one of the following relations is true?

Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

If all the sequence voltages at the fault point in a power system are equal then the fault is a

The gauss siedel load flow method has following disadvantages, tick the incorrect statement

High volatage DC (HVDC) transmission is mainly used for

Keeping in view the cost and overall effectiveness the following circuit breaker is besy suited for the capacitor bank switching

The insulation strength of an EHV transmission line is mainly governed by

The insulation resistance of a 20 km long underground cable is 8 mega ohm, insulation resisatance for similar cable of 10 km is

For thiven base voltage and base volt amperes, the per unit impedance value of this element is x. The per unit impedance value of this element when the volatage and volt amperes bases are both doubled is

The surge impedence of a 400 km overhead transmission line is 400 ohms. For a 200 km length of the same line, the surge impedance will be

The surge impedance of a 3-phase 400 kV transmission line is 400 Ω. The Surge Impedance Loading is :

(A) 400 MW 
(B) 100 MW
(C) 1600 kW 
(D) 400 kW

What is Minimum Oil Circuit Breaker (MOCB) ?

These types of circuit breakers only use oil as the interrupting medium and not as insulating material in all chambers.These types of breakers are widely used in transmission and distribution networks, but have a known sensitivity to transient recovery voltages (TRV) and are prone to re-strikes during the switching of capacitor banks.The operation of a minimum oil circuit breaker is similar to that of the bulk oil circuit breaker, as the arc is contained within the arc chamber. This results in a pressurized bubble of vaporized hydrogen around the arc. This pressure is released by an orifice when contact separation distance is reached. This results in the rapid cooling of the area between arcing contacts and fast deionisation at current zero. This in turn gives rise to transient recovery voltages over the contacts aiming to reinstate the current flow. This can result in a restrike and an unsuccessful interruption. This effect can further be complicated with the switching of capacitor loads and out-of-phase currents, but can be addressed by pressurizing the device with dry nitrogen.

36 KV MOCB