Job interview or viva Topics for Electrical Engineers (Part-5).

Electrical Engineering interview question and answers:Job interview or viva Topics for Electronics and Electrical Engineers (Part-5).

In this topic we will describe Transient Stability,Stability Limit,Steady State Stability Limit,Transient Stability Limit,Power-angle Equation.

 16. Transient Stability: 

In the system the ability of maintaining synchronous operation to reach a stable condition or state or the one close to it after a large disturbance is called Transient Stability.

For the Transient Stability there are some important assumptions. Such as,

·        System resistance(R) may be neglected in comparison with reactance(X).

·        The System may be reduced in form of two-machine equivalent system.

·        Each machine may be considered to supply an infinite bus.

·        Direct Axis Reactance= Quadrature Axis Reactance.

·        The rotor shape can be cylindrical.

·        For Machine representation Direct Axis Reactance can be used.

·        For few seconds after occurrence of disturbance, the input power of the shaft may be assumed constant.

17. Stability Limit: 

In the system, when the maximum amount of power can be transferred between source and loads in a network, without the loss of synchronism is called Stability Limit.

18. Steady State Stability Limit:

Under Steady state condition, when the load is gradually increased but there is no unstable condition in the system and the maximum power can transferred is called Steady State Stability Limit.

19. Transient Stability Limit: 

The amount of maximum power that can be transferred in the system without making the system unstable when a sudden or large disturbance occurs. This is called Transient Stability Limit.

20. Power-angle Equation: 

Here, Pe= Power, δ= load angle.

Pe=Pemax Sin δ

The maximum steady state power transferred, when δ = 90°.

The value of Pemax often called pull-out power or steady state limit.

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