Answer / guest

since the system is designed with a standard frequency say
50Hz or 60 Hz, if the frequency goes low, the following
effects will happen:

1. induction motor will run with low speed and consume more
current.
2. transmission cost/losses will be more.
3. capacitive reactance will be more.
4. metering device will record more power

Answer / sanjeet

losses increases ,voltage regulation disturb ,motor run
with lower speed

Answer / sivagurusgs

based on the V/F if frequency is less there is some
unbalance voltage flows through it(over flux occured) it
will cause the motor to run slowly and whenever unbalance
condition occurs the motor will take unbalance load so the
winding will be heated and thermal losses occur.s if v use
the relay to rectify this problem. Use overflux protection
for motor and overcome this fault. whenever frequency or
voltage gets unbalanced the relay will trip and isolate the
motor from the fault.

Answer / amarnath

simple answer lower the frequency lower the voltage
supplied and will result in power losses.

why dc motor is called constant flux motor?

1 Answers  

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What is the major difference between P.T. & C.V.T ? Why CVT is used in HT Transmission line in place of P.T.?

13 Answers   APGenco, OPTCL,

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1)what is the function of a frequency inverter? 2)If a few frequency inverter are connected onto a device network,what are the two setting that will ensure the frequency inverter work properly on the network. 3)whats is the name of the input sensor for weigher? 4)How to confirm that the load cellis faulty? 5)Describe briefly the steps to validate that the weigher is working properly? 6)Describe the procedure to validate the flowmeter accuracy? 7)Describe briefly the steps to validate that the tempreture sensor/transformer is working properly. 8)what is the adjustment that need to be done when you are calibrating the temperature transmitter ? 9)what are the safety measures to be taken before disconnecting motor for rewinding. 10)whats is the synchronous speed in rpm of typical 4pole 50hz motor? 11)whats is the formula for kw, ohm's law 12)if a 3phase motor is rated 3kw,415vac,what is it's rated ampere?

0 Answers  

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eddy current losses depends on?(a-max magnetic feild,b-avg magnetic feild,c-on frequency,d-on square of frequency)?

3 Answers   Ecil,

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We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 Answers  

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The 3 phase Delta connection RB=440V, BY=350V,.......* is Line to Line voltage RY= ? And Formula....?

0 Answers  

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what is pilot wire protection? wer is it using?

1 Answers  

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sir , what happen if we decrease ( approx 3 inch ) the lenth of shaft in 110KW Induction , three phase motor. actually a 110KW motor is couppled with star couplling to 120TR compressor. When we doing maintenance in compressor it is required to skid the motor backword and resulting dis- alightnment . so we want to change the tyre coupling in place of existing coupling. so it is required to cut off the rotor aprox 3 inch form driving side.

2 Answers  

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Ceiling fan motor wiring Hi, I have 2 ceiling fans broken. The receiver/control units burned out due to lightening. One Harbor Breeze and one Hunter's I took them apart (remove receiver units). Now on both of the motor I see 4 wires coming out from each motor I really want to know the function of each wire. Are there anyway I can test to see which is which? After searching forums I know these 4 wires are from 2 sets of coils inside the motor, one is Start winding and the other is Runing winding I could not find the receiver/control unit any where, so I am planing to buy Capacitors and universal remote controls to make the fans run again. Anyone has any idea how to do the wiring, please help Thnks

1 Answers  

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If OLTC is in manual position there is chance to variation of voltage(Low or High)?

1 Answers   Juniper Networks,

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How the current flows in dc circuit?

3 Answers  

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What is a copper loss or i2r loss pc?

0 Answers  

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