starter used to reduce the starting current of the motor.
and to safe the motor winding in the high starting
current.different type of starter used to the motor. i.e, 3
point starter,4 point starter used to d.c and a.c motors.
Please Help Members By Posting Answers For Below Questions
i am an maintenance engineer. one distribution board have 5
feeder. recently its ELR trips frequently, but it take some
times after trip( 10min,20min..)but 3 feeder no load. two
feeder only loaded. i checked one feeder IR value all values
are above 50Mohm.but B phase to Earth is only 9Mohm.any
problem about low value
how can i change the rotation of the AC single phase induction motor and show me by diagram
we have two motors 1250kW,6.6kV to be coupled
on the same shaft ,so please provide assistance for their
Scott connection is used for
A 3-phase to 2-phase conversion B to achieve
C to save copper D to reduce harmonics
What is the BS(British Standard)code for 11kv motor
We have 750KVA DG set, we want to introduce REF relay with
1250/1A,CL PS,Current transformers.The lead distance of
2.5mm copper flexible cable from CT to relay is around
5mtrs.We would like to know the knee point votage(VK) & IM
calculion for CT's
If increased the frequency up to 1000 then what changes
shows in voltage?
If i=10+10sin314t then find the rms and average value of current with explain?
what is the importance of Fault MVA.
how to calculate fault mva of 33kv substation connected by
6.5 km line(single circuit with equal spacing) with
110/11kv transformer in 110kv susbstation.the fault mva on
11 kv bus in 110kv susbstation is 208mva.
Which motor is 3.3 or 11kV more reliable, in terms of
Q.1:What protection will be used on HT and LT side of 33/0.4
KV, MVA transformer. Indicate capacities of protective
device to be used.
Q.2:Which types of back-up protections are used in the power
transformers? What do you understand by the term over travel
in the relay?
Q.3:How star and delta connected winding transformer are
provided from earth fault
how to find ratio of CT & PT in 66/11kv 12 mva supply
system ? explain with calculation.
calculate external resistance values to add to the rotor of
a slip ring induction motor. STATOR- 415 V, 3 phase delta,
1100 A, 50 Hz, 1490 rpm, pf 0,86 ROTOR - 660 V, 590 A, 50
Hz. STATOR current at each steps STEP1-600A,STEP2-
EXPLAIN WHY THE SURGE CURRENT RATING OF AN MCCB OR CIRCUIT
BREAKER DECREASES WITH INCREASE IN THE RATING OF MCCB OR