at work we have a 3 phase motor but on testing one phase isnt getting a reading. it runs 24 hours a day all week. stops and starts well no noise or heating. the phase isnt down to earth.is it just a bad meter reading or not? phases one and three came up with a resistance reading of 0.4 but phase 2 couldnt get anything shows up as open circuit.
If there are two transformer having rating of 2.5mva,
6.6kv/440v(satr-star),and the load is 600kw then what is
better to maintain less losses in transformer having both
transformer in parellel or only single transformer
connected to load? Please give calculated answer
How we calculate the Multiplying Factor of Kwh meter for 3 phase alternator.
i have faced a problem in ro plant grunfos make bm30type pump it is 22kw pump. We start this pump using siemens 3rw 4423-ibc44, 30kw softstarter but this soft starter will frequently failier so we planed to change dol starter. So pls tell anybudy its possible or not.
what is protection class current transformer.
pls check this 4-20ma to RS485 module datasheet,pls guve me
Which device of PlC does share load between DG sets when
DG are running in perallel?
1) Explain why we don't link the two earthing system ht and mv on a pole mounted transformer sub-station.
In single phase ac ups supply when current is measured with
tong tester neutral current is found more than phase
current.What is the reason?
Why water bubbles when D.C. Current is passed through it?
Why not when A.C. Current is passed?
1. Icw: rated short circuit working withstand capacity
2. Icu: Rated ultimate breaking capacity
3. Ics: Rated service short circut withstand capacity
4. other specification of ACB
1.how many types of relays?
2.difference between ATS& STS?
Electromagnetic torque developed by the motor is
compared to shaft torque.
A less B same
C depends on motor design D more
At light load transformer efficiency is less because
A secondary output is low B transformer losses
C fixed loss is high compared to output
copper loss is small
Application Comparison between 22KV (UE)and 33KV (E) system.
Are we allowed to use 33KV (E) cable in lieu of 22KV (UE)
What are the technical disadvantages.
what is earth fault relay 64T, why it is used in main Incomer
and neutral CT of Transformer.