What is purpose of Rotor angle limiter?

1 Answer

Answer :

It limits generator voltage & rotor voltage.  

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Last Answer : It limits overloading of rotor.  

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Last Answer : Load angle limiter, it either limits the angle between grid load center and the rotor axis or generator terminal & rotor axis. 

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Last Answer : It limits the stator current.

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Last Answer : Field forcing acts for 10 seconds to maintain the generator terminal voltage during fault condition so as to operated the protection relays. 

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Last Answer : The angle in the AC cycle at which the thyristor starts conducting at the application of positive voltage to gate is known as the firing angle (α)

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Last Answer : It avoids oscillation of the AC machine (Rotor oscillations).  

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Last Answer : Thyristor bridges are connected in parallel to improve current rating.  

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Last Answer : RC network across each thyristor protects against Hole Storage Effect.  

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Last Answer : Silicon carbide materials used for making non-linear resistor. The purpose of this resistor is to avoid surge voltage when field breaker opens. These resistors are connected in parallel to the main field winding (Rotor). 

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Last Answer : If a machine is operating with an earthed neutral, a system earth fault will give rise to zero sequence current in the machine. 

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Last Answer : Negative sequence arises whenever there is any unbalance present in the system. Their effect is to set up a field rotating in opposite direction to the main field.

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Last Answer : Fast response time, high reliability, interchangeability of parts during operation, less wear & tear due to static devices & less maintenance.  

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Last Answer : When firing angle a = 90º the positive & negative voltages areas are equal. With a higher than 90º the negative areas are greater so the total voltage becomes negative. This condition is termed as 'Inverter Operation".  

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Description : A 3 stack stepper motor with 12 numbers of rotor teeth has a step angle of ____________. (A) 12° (B) 8° (C) 24° (D) 10°

Last Answer : Ans. D Given m = 3, Nr = 12 Step angle = 360 / m x Nr = 360 /3 x 12 = 10°

Description : As shown in the illustration, the purpose of the item labeled 'Z', in assembly No. 2, is to _____________. EL-0001 A. keep the rotor in balance B. align the rotor to the stator C. dynamically balance the rotor D. cool the motor

Last Answer : Answer: D

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Last Answer : Answer: D

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