What is the effect of SCR on synchronous machine?

A synchronous machine with a high value of SCR had a better voltage regulation and improved steady-state stability limit, but the short circuit fault current in the armature is high. It also affects the size and cost of the machine.

What are the effects of SCR on machine performance?

Generator SCR This increases the machines’ stability while operating on grid, but simultaneously will increase the short circuit current delivery capability of the machine (higher short circuit current) and subsequently higher machine size and its cost.

What are the factors that influence the choice of specific magnetic loading in a synchronous machine?

Following are the some of the factors which influence the choice of specific electric loadings. 1. Copper loss: Higher the value of q larger will be the number of armature of conductors which results in higher copper loss. This will result in higher temperature rise and reduction in efficiency.

What is the condition for steady state stability?

Steady-state Stability:- Steady. -state stability relates to the response of synchronous machine to a gradually increasing load. It is basically concerned with the determination of the upper limit of machine loading without losing synchronism, provided the loading is increased gradually.

When a synchronous generator is designed with lower value of SCR it?

For the small value of the short circuit ratio (SCR), the synchronizing power is small. As the synchronizing power keeps the machine in synchronism, a lower value of the SCR has a low stability limit. Thus, a machine with a low SCR is less stable when operating in parallel with the other generators.

What is meant by synchronous condenser?

In electrical engineering, a synchronous condenser (sometimes called a syncon, synchronous capacitor or synchronous compensator) is a DC-excited synchronous motor, whose shaft is not connected to anything but spins freely.

What does the SCR Short Circuit ratio of a synchronous machine yield?

The short circuit ratio (SCR) of a synchronous machine is defined as the ratio of the field current required to generate rated voltage on an open circuit to the field current required to circulate rated armature current on a short circuit. S C R = I f f o r r a t e d O .

Why do small machine have lower specific magnetic loading?

Specific Magnetic Loading The tapering of teeth is generally used in the small machine having small diameter. The ratio of Bt / Bav is large at the smallest width of teeth therefore the lower value of specific magnetic loading is permissible for a given value of teeth flux density ( Bt ).

Which of the following factor does not affect the choice of specific magnetic loading?

Explanation: Flux density is one of the factors used in the determination of the specific magnetic loading. The flux density is directly proportional to the output. 9. What is the relation between output and the specific electric loading?

Why transient stability limit is lower than steady state stability limit?

This maximum power limit till the transient persists is called as Transient Stability Limit. Since, during transient or fault, real power output is less so Transient Stability Limit is less than Steady State Stability Limit.